//======= Copyright (c) Valve Corporation, All rights reserved. ===============
//
// Purpose: This file contains C#/managed code bindings for the OpenVR interfaces
// This file is auto-generated, do not edit it.
//
//=============================================================================

using System;
using System.Runtime.InteropServices;
using Valve.VR;

namespace Valve.VR
{

[StructLayout(LayoutKind.Sequential)]
public struct IVRSystem
{
       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _GetRecommendedRenderTargetSize(ref uint pnWidth, ref uint pnHeight);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetRecommendedRenderTargetSize GetRecommendedRenderTargetSize;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate HmdMatrix44_t _GetProjectionMatrix(EVREye eEye, float fNearZ, float fFarZ);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetProjectionMatrix GetProjectionMatrix;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _GetProjectionRaw(EVREye eEye, ref float pfLeft, ref float pfRight, ref float pfTop, ref float pfBottom);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetProjectionRaw GetProjectionRaw;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _ComputeDistortion(EVREye eEye, float fU, float fV, ref DistortionCoordinates_t pDistortionCoordinates);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ComputeDistortion ComputeDistortion;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate HmdMatrix34_t _GetEyeToHeadTransform(EVREye eEye);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetEyeToHeadTransform GetEyeToHeadTransform;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetTimeSinceLastVsync(ref float pfSecondsSinceLastVsync, ref ulong pulFrameCounter);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetTimeSinceLastVsync GetTimeSinceLastVsync;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate int _GetD3D9AdapterIndex();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetD3D9AdapterIndex GetD3D9AdapterIndex;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _GetDXGIOutputInfo(ref int pnAdapterIndex);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetDXGIOutputInfo GetDXGIOutputInfo;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _IsDisplayOnDesktop();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _IsDisplayOnDesktop IsDisplayOnDesktop;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _SetDisplayVisibility(bool bIsVisibleOnDesktop);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetDisplayVisibility SetDisplayVisibility;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _GetDeviceToAbsoluteTrackingPose(ETrackingUniverseOrigin eOrigin, float fPredictedSecondsToPhotonsFromNow, [In, Out] TrackedDevicePose_t[] pTrackedDevicePoseArray, uint unTrackedDevicePoseArrayCount);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetDeviceToAbsoluteTrackingPose GetDeviceToAbsoluteTrackingPose;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _ResetSeatedZeroPose();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ResetSeatedZeroPose ResetSeatedZeroPose;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate HmdMatrix34_t _GetSeatedZeroPoseToStandingAbsoluteTrackingPose();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetSeatedZeroPoseToStandingAbsoluteTrackingPose GetSeatedZeroPoseToStandingAbsoluteTrackingPose;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate HmdMatrix34_t _GetRawZeroPoseToStandingAbsoluteTrackingPose();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetRawZeroPoseToStandingAbsoluteTrackingPose GetRawZeroPoseToStandingAbsoluteTrackingPose;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetSortedTrackedDeviceIndicesOfClass(ETrackedDeviceClass eTrackedDeviceClass, [In, Out] uint[] punTrackedDeviceIndexArray, uint unTrackedDeviceIndexArrayCount, uint unRelativeToTrackedDeviceIndex);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetSortedTrackedDeviceIndicesOfClass GetSortedTrackedDeviceIndicesOfClass;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EDeviceActivityLevel _GetTrackedDeviceActivityLevel(uint unDeviceId);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetTrackedDeviceActivityLevel GetTrackedDeviceActivityLevel;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _ApplyTransform(ref TrackedDevicePose_t pOutputPose, ref TrackedDevicePose_t pTrackedDevicePose, ref HmdMatrix34_t pTransform);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ApplyTransform ApplyTransform;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetTrackedDeviceIndexForControllerRole(ETrackedControllerRole unDeviceType);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetTrackedDeviceIndexForControllerRole GetTrackedDeviceIndexForControllerRole;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate ETrackedControllerRole _GetControllerRoleForTrackedDeviceIndex(uint unDeviceIndex);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetControllerRoleForTrackedDeviceIndex GetControllerRoleForTrackedDeviceIndex;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate ETrackedDeviceClass _GetTrackedDeviceClass(uint unDeviceIndex);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetTrackedDeviceClass GetTrackedDeviceClass;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _IsTrackedDeviceConnected(uint unDeviceIndex);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _IsTrackedDeviceConnected IsTrackedDeviceConnected;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetBoolTrackedDeviceProperty(uint unDeviceIndex, ETrackedDeviceProperty prop, ref ETrackedPropertyError pError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetBoolTrackedDeviceProperty GetBoolTrackedDeviceProperty;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate float _GetFloatTrackedDeviceProperty(uint unDeviceIndex, ETrackedDeviceProperty prop, ref ETrackedPropertyError pError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetFloatTrackedDeviceProperty GetFloatTrackedDeviceProperty;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate int _GetInt32TrackedDeviceProperty(uint unDeviceIndex, ETrackedDeviceProperty prop, ref ETrackedPropertyError pError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetInt32TrackedDeviceProperty GetInt32TrackedDeviceProperty;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate ulong _GetUint64TrackedDeviceProperty(uint unDeviceIndex, ETrackedDeviceProperty prop, ref ETrackedPropertyError pError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetUint64TrackedDeviceProperty GetUint64TrackedDeviceProperty;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate HmdMatrix34_t _GetMatrix34TrackedDeviceProperty(uint unDeviceIndex, ETrackedDeviceProperty prop, ref ETrackedPropertyError pError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetMatrix34TrackedDeviceProperty GetMatrix34TrackedDeviceProperty;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetStringTrackedDeviceProperty(uint unDeviceIndex, ETrackedDeviceProperty prop, System.Text.StringBuilder pchValue, uint unBufferSize, ref ETrackedPropertyError pError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetStringTrackedDeviceProperty GetStringTrackedDeviceProperty;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate IntPtr _GetPropErrorNameFromEnum(ETrackedPropertyError error);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetPropErrorNameFromEnum GetPropErrorNameFromEnum;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _PollNextEvent(ref VREvent_t pEvent, uint uncbVREvent);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _PollNextEvent PollNextEvent;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _PollNextEventWithPose(ETrackingUniverseOrigin eOrigin, ref VREvent_t pEvent, uint uncbVREvent, ref TrackedDevicePose_t pTrackedDevicePose);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _PollNextEventWithPose PollNextEventWithPose;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate IntPtr _GetEventTypeNameFromEnum(EVREventType eType);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetEventTypeNameFromEnum GetEventTypeNameFromEnum;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate HiddenAreaMesh_t _GetHiddenAreaMesh(EVREye eEye, EHiddenAreaMeshType type);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetHiddenAreaMesh GetHiddenAreaMesh;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetControllerState(uint unControllerDeviceIndex, ref VRControllerState_t pControllerState, uint unControllerStateSize);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetControllerState GetControllerState;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetControllerStateWithPose(ETrackingUniverseOrigin eOrigin, uint unControllerDeviceIndex, ref VRControllerState_t pControllerState, uint unControllerStateSize, ref TrackedDevicePose_t pTrackedDevicePose);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetControllerStateWithPose GetControllerStateWithPose;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _TriggerHapticPulse(uint unControllerDeviceIndex, uint unAxisId, char usDurationMicroSec);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _TriggerHapticPulse TriggerHapticPulse;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate IntPtr _GetButtonIdNameFromEnum(EVRButtonId eButtonId);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetButtonIdNameFromEnum GetButtonIdNameFromEnum;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate IntPtr _GetControllerAxisTypeNameFromEnum(EVRControllerAxisType eAxisType);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetControllerAxisTypeNameFromEnum GetControllerAxisTypeNameFromEnum;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _CaptureInputFocus();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _CaptureInputFocus CaptureInputFocus;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _ReleaseInputFocus();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ReleaseInputFocus ReleaseInputFocus;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _IsInputFocusCapturedByAnotherProcess();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _IsInputFocusCapturedByAnotherProcess IsInputFocusCapturedByAnotherProcess;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _DriverDebugRequest(uint unDeviceIndex, string pchRequest, string pchResponseBuffer, uint unResponseBufferSize);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _DriverDebugRequest DriverDebugRequest;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRFirmwareError _PerformFirmwareUpdate(uint unDeviceIndex);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _PerformFirmwareUpdate PerformFirmwareUpdate;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _AcknowledgeQuit_Exiting();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _AcknowledgeQuit_Exiting AcknowledgeQuit_Exiting;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _AcknowledgeQuit_UserPrompt();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _AcknowledgeQuit_UserPrompt AcknowledgeQuit_UserPrompt;

}

[StructLayout(LayoutKind.Sequential)]
public struct IVRExtendedDisplay
{
       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _GetWindowBounds(ref int pnX, ref int pnY, ref uint pnWidth, ref uint pnHeight);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetWindowBounds GetWindowBounds;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _GetEyeOutputViewport(EVREye eEye, ref uint pnX, ref uint pnY, ref uint pnWidth, ref uint pnHeight);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetEyeOutputViewport GetEyeOutputViewport;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _GetDXGIOutputInfo(ref int pnAdapterIndex, ref int pnAdapterOutputIndex);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetDXGIOutputInfo GetDXGIOutputInfo;

}

[StructLayout(LayoutKind.Sequential)]
public struct IVRTrackedCamera
{
       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate IntPtr _GetCameraErrorNameFromEnum(EVRTrackedCameraError eCameraError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetCameraErrorNameFromEnum GetCameraErrorNameFromEnum;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRTrackedCameraError _HasCamera(uint nDeviceIndex, ref bool pHasCamera);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _HasCamera HasCamera;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRTrackedCameraError _GetCameraFrameSize(uint nDeviceIndex, EVRTrackedCameraFrameType eFrameType, ref uint pnWidth, ref uint pnHeight, ref uint pnFrameBufferSize);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetCameraFrameSize GetCameraFrameSize;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRTrackedCameraError _GetCameraIntrinsics(uint nDeviceIndex, EVRTrackedCameraFrameType eFrameType, ref HmdVector2_t pFocalLength, ref HmdVector2_t pCenter);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetCameraIntrinsics GetCameraIntrinsics;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRTrackedCameraError _GetCameraProjection(uint nDeviceIndex, EVRTrackedCameraFrameType eFrameType, float flZNear, float flZFar, ref HmdMatrix44_t pProjection);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetCameraProjection GetCameraProjection;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRTrackedCameraError _AcquireVideoStreamingService(uint nDeviceIndex, ref ulong pHandle);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _AcquireVideoStreamingService AcquireVideoStreamingService;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRTrackedCameraError _ReleaseVideoStreamingService(ulong hTrackedCamera);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ReleaseVideoStreamingService ReleaseVideoStreamingService;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRTrackedCameraError _GetVideoStreamFrameBuffer(ulong hTrackedCamera, EVRTrackedCameraFrameType eFrameType, IntPtr pFrameBuffer, uint nFrameBufferSize, ref CameraVideoStreamFrameHeader_t pFrameHeader, uint nFrameHeaderSize);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetVideoStreamFrameBuffer GetVideoStreamFrameBuffer;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRTrackedCameraError _GetVideoStreamTextureSize(uint nDeviceIndex, EVRTrackedCameraFrameType eFrameType, ref VRTextureBounds_t pTextureBounds, ref uint pnWidth, ref uint pnHeight);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetVideoStreamTextureSize GetVideoStreamTextureSize;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRTrackedCameraError _GetVideoStreamTextureD3D11(ulong hTrackedCamera, EVRTrackedCameraFrameType eFrameType, IntPtr pD3D11DeviceOrResource, ref IntPtr ppD3D11ShaderResourceView, ref CameraVideoStreamFrameHeader_t pFrameHeader, uint nFrameHeaderSize);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetVideoStreamTextureD3D11 GetVideoStreamTextureD3D11;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRTrackedCameraError _GetVideoStreamTextureGL(ulong hTrackedCamera, EVRTrackedCameraFrameType eFrameType, ref uint pglTextureId, ref CameraVideoStreamFrameHeader_t pFrameHeader, uint nFrameHeaderSize);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetVideoStreamTextureGL GetVideoStreamTextureGL;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRTrackedCameraError _ReleaseVideoStreamTextureGL(ulong hTrackedCamera, uint glTextureId);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ReleaseVideoStreamTextureGL ReleaseVideoStreamTextureGL;

}

[StructLayout(LayoutKind.Sequential)]
public struct IVRApplications
{
       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRApplicationError _AddApplicationManifest(string pchApplicationManifestFullPath, bool bTemporary);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _AddApplicationManifest AddApplicationManifest;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRApplicationError _RemoveApplicationManifest(string pchApplicationManifestFullPath);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _RemoveApplicationManifest RemoveApplicationManifest;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _IsApplicationInstalled(string pchAppKey);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _IsApplicationInstalled IsApplicationInstalled;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetApplicationCount();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetApplicationCount GetApplicationCount;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRApplicationError _GetApplicationKeyByIndex(uint unApplicationIndex, System.Text.StringBuilder pchAppKeyBuffer, uint unAppKeyBufferLen);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetApplicationKeyByIndex GetApplicationKeyByIndex;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRApplicationError _GetApplicationKeyByProcessId(uint unProcessId, string pchAppKeyBuffer, uint unAppKeyBufferLen);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetApplicationKeyByProcessId GetApplicationKeyByProcessId;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRApplicationError _LaunchApplication(string pchAppKey);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _LaunchApplication LaunchApplication;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRApplicationError _LaunchTemplateApplication(string pchTemplateAppKey, string pchNewAppKey, [In, Out] AppOverrideKeys_t[] pKeys, uint unKeys);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _LaunchTemplateApplication LaunchTemplateApplication;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRApplicationError _LaunchApplicationFromMimeType(string pchMimeType, string pchArgs);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _LaunchApplicationFromMimeType LaunchApplicationFromMimeType;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRApplicationError _LaunchDashboardOverlay(string pchAppKey);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _LaunchDashboardOverlay LaunchDashboardOverlay;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _CancelApplicationLaunch(string pchAppKey);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _CancelApplicationLaunch CancelApplicationLaunch;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRApplicationError _IdentifyApplication(uint unProcessId, string pchAppKey);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _IdentifyApplication IdentifyApplication;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetApplicationProcessId(string pchAppKey);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetApplicationProcessId GetApplicationProcessId;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate IntPtr _GetApplicationsErrorNameFromEnum(EVRApplicationError error);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetApplicationsErrorNameFromEnum GetApplicationsErrorNameFromEnum;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetApplicationPropertyString(string pchAppKey, EVRApplicationProperty eProperty, System.Text.StringBuilder pchPropertyValueBuffer, uint unPropertyValueBufferLen, ref EVRApplicationError peError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetApplicationPropertyString GetApplicationPropertyString;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetApplicationPropertyBool(string pchAppKey, EVRApplicationProperty eProperty, ref EVRApplicationError peError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetApplicationPropertyBool GetApplicationPropertyBool;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate ulong _GetApplicationPropertyUint64(string pchAppKey, EVRApplicationProperty eProperty, ref EVRApplicationError peError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetApplicationPropertyUint64 GetApplicationPropertyUint64;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRApplicationError _SetApplicationAutoLaunch(string pchAppKey, bool bAutoLaunch);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetApplicationAutoLaunch SetApplicationAutoLaunch;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetApplicationAutoLaunch(string pchAppKey);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetApplicationAutoLaunch GetApplicationAutoLaunch;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRApplicationError _SetDefaultApplicationForMimeType(string pchAppKey, string pchMimeType);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetDefaultApplicationForMimeType SetDefaultApplicationForMimeType;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetDefaultApplicationForMimeType(string pchMimeType, string pchAppKeyBuffer, uint unAppKeyBufferLen);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetDefaultApplicationForMimeType GetDefaultApplicationForMimeType;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetApplicationSupportedMimeTypes(string pchAppKey, string pchMimeTypesBuffer, uint unMimeTypesBuffer);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetApplicationSupportedMimeTypes GetApplicationSupportedMimeTypes;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetApplicationsThatSupportMimeType(string pchMimeType, string pchAppKeysThatSupportBuffer, uint unAppKeysThatSupportBuffer);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetApplicationsThatSupportMimeType GetApplicationsThatSupportMimeType;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetApplicationLaunchArguments(uint unHandle, string pchArgs, uint unArgs);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetApplicationLaunchArguments GetApplicationLaunchArguments;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRApplicationError _GetStartingApplication(string pchAppKeyBuffer, uint unAppKeyBufferLen);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetStartingApplication GetStartingApplication;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRApplicationTransitionState _GetTransitionState();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetTransitionState GetTransitionState;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRApplicationError _PerformApplicationPrelaunchCheck(string pchAppKey);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _PerformApplicationPrelaunchCheck PerformApplicationPrelaunchCheck;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate IntPtr _GetApplicationsTransitionStateNameFromEnum(EVRApplicationTransitionState state);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetApplicationsTransitionStateNameFromEnum GetApplicationsTransitionStateNameFromEnum;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _IsQuitUserPromptRequested();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _IsQuitUserPromptRequested IsQuitUserPromptRequested;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRApplicationError _LaunchInternalProcess(string pchBinaryPath, string pchArguments, string pchWorkingDirectory);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _LaunchInternalProcess LaunchInternalProcess;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetCurrentSceneProcessId();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetCurrentSceneProcessId GetCurrentSceneProcessId;

}

[StructLayout(LayoutKind.Sequential)]
public struct IVRChaperone
{
       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate ChaperoneCalibrationState _GetCalibrationState();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetCalibrationState GetCalibrationState;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetPlayAreaSize(ref float pSizeX, ref float pSizeZ);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetPlayAreaSize GetPlayAreaSize;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetPlayAreaRect(ref HmdQuad_t rect);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetPlayAreaRect GetPlayAreaRect;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _ReloadInfo();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ReloadInfo ReloadInfo;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _SetSceneColor(HmdColor_t color);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetSceneColor SetSceneColor;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _GetBoundsColor(ref HmdColor_t pOutputColorArray, int nNumOutputColors, float flCollisionBoundsFadeDistance, ref HmdColor_t pOutputCameraColor);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetBoundsColor GetBoundsColor;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _AreBoundsVisible();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _AreBoundsVisible AreBoundsVisible;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _ForceBoundsVisible(bool bForce);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ForceBoundsVisible ForceBoundsVisible;

}

[StructLayout(LayoutKind.Sequential)]
public struct IVRChaperoneSetup
{
       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _CommitWorkingCopy(EChaperoneConfigFile configFile);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _CommitWorkingCopy CommitWorkingCopy;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _RevertWorkingCopy();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _RevertWorkingCopy RevertWorkingCopy;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetWorkingPlayAreaSize(ref float pSizeX, ref float pSizeZ);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetWorkingPlayAreaSize GetWorkingPlayAreaSize;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetWorkingPlayAreaRect(ref HmdQuad_t rect);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetWorkingPlayAreaRect GetWorkingPlayAreaRect;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetWorkingCollisionBoundsInfo([In, Out] HmdQuad_t[] pQuadsBuffer, ref uint punQuadsCount);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetWorkingCollisionBoundsInfo GetWorkingCollisionBoundsInfo;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetLiveCollisionBoundsInfo([In, Out] HmdQuad_t[] pQuadsBuffer, ref uint punQuadsCount);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetLiveCollisionBoundsInfo GetLiveCollisionBoundsInfo;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetWorkingSeatedZeroPoseToRawTrackingPose(ref HmdMatrix34_t pmatSeatedZeroPoseToRawTrackingPose);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetWorkingSeatedZeroPoseToRawTrackingPose GetWorkingSeatedZeroPoseToRawTrackingPose;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetWorkingStandingZeroPoseToRawTrackingPose(ref HmdMatrix34_t pmatStandingZeroPoseToRawTrackingPose);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetWorkingStandingZeroPoseToRawTrackingPose GetWorkingStandingZeroPoseToRawTrackingPose;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _SetWorkingPlayAreaSize(float sizeX, float sizeZ);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetWorkingPlayAreaSize SetWorkingPlayAreaSize;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _SetWorkingCollisionBoundsInfo([In, Out] HmdQuad_t[] pQuadsBuffer, uint unQuadsCount);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetWorkingCollisionBoundsInfo SetWorkingCollisionBoundsInfo;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _SetWorkingSeatedZeroPoseToRawTrackingPose(ref HmdMatrix34_t pMatSeatedZeroPoseToRawTrackingPose);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetWorkingSeatedZeroPoseToRawTrackingPose SetWorkingSeatedZeroPoseToRawTrackingPose;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _SetWorkingStandingZeroPoseToRawTrackingPose(ref HmdMatrix34_t pMatStandingZeroPoseToRawTrackingPose);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetWorkingStandingZeroPoseToRawTrackingPose SetWorkingStandingZeroPoseToRawTrackingPose;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _ReloadFromDisk(EChaperoneConfigFile configFile);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ReloadFromDisk ReloadFromDisk;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetLiveSeatedZeroPoseToRawTrackingPose(ref HmdMatrix34_t pmatSeatedZeroPoseToRawTrackingPose);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetLiveSeatedZeroPoseToRawTrackingPose GetLiveSeatedZeroPoseToRawTrackingPose;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _SetWorkingCollisionBoundsTagsInfo([In, Out] byte[] pTagsBuffer, uint unTagCount);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetWorkingCollisionBoundsTagsInfo SetWorkingCollisionBoundsTagsInfo;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetLiveCollisionBoundsTagsInfo([In, Out] byte[] pTagsBuffer, ref uint punTagCount);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetLiveCollisionBoundsTagsInfo GetLiveCollisionBoundsTagsInfo;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _SetWorkingPhysicalBoundsInfo([In, Out] HmdQuad_t[] pQuadsBuffer, uint unQuadsCount);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetWorkingPhysicalBoundsInfo SetWorkingPhysicalBoundsInfo;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetLivePhysicalBoundsInfo([In, Out] HmdQuad_t[] pQuadsBuffer, ref uint punQuadsCount);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetLivePhysicalBoundsInfo GetLivePhysicalBoundsInfo;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _ExportLiveToBuffer(System.Text.StringBuilder pBuffer, ref uint pnBufferLength);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ExportLiveToBuffer ExportLiveToBuffer;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _ImportFromBufferToWorking(string pBuffer, uint nImportFlags);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ImportFromBufferToWorking ImportFromBufferToWorking;

}

[StructLayout(LayoutKind.Sequential)]
public struct IVRCompositor
{
       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _SetTrackingSpace(ETrackingUniverseOrigin eOrigin);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetTrackingSpace SetTrackingSpace;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate ETrackingUniverseOrigin _GetTrackingSpace();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetTrackingSpace GetTrackingSpace;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRCompositorError _WaitGetPoses([In, Out] TrackedDevicePose_t[] pRenderPoseArray, uint unRenderPoseArrayCount, [In, Out] TrackedDevicePose_t[] pGamePoseArray, uint unGamePoseArrayCount);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _WaitGetPoses WaitGetPoses;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRCompositorError _GetLastPoses([In, Out] TrackedDevicePose_t[] pRenderPoseArray, uint unRenderPoseArrayCount, [In, Out] TrackedDevicePose_t[] pGamePoseArray, uint unGamePoseArrayCount);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetLastPoses GetLastPoses;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRCompositorError _GetLastPoseForTrackedDeviceIndex(uint unDeviceIndex, ref TrackedDevicePose_t pOutputPose, ref TrackedDevicePose_t pOutputGamePose);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetLastPoseForTrackedDeviceIndex GetLastPoseForTrackedDeviceIndex;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRCompositorError _Submit(EVREye eEye, ref Texture_t pTexture, ref VRTextureBounds_t pBounds, EVRSubmitFlags nSubmitFlags);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _Submit Submit;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _ClearLastSubmittedFrame();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ClearLastSubmittedFrame ClearLastSubmittedFrame;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _PostPresentHandoff();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _PostPresentHandoff PostPresentHandoff;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetFrameTiming(ref Compositor_FrameTiming pTiming, uint unFramesAgo);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetFrameTiming GetFrameTiming;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetFrameTimings(ref Compositor_FrameTiming pTiming, uint nFrames);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetFrameTimings GetFrameTimings;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate float _GetFrameTimeRemaining();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetFrameTimeRemaining GetFrameTimeRemaining;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _GetCumulativeStats(ref Compositor_CumulativeStats pStats, uint nStatsSizeInBytes);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetCumulativeStats GetCumulativeStats;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _FadeToColor(float fSeconds, float fRed, float fGreen, float fBlue, float fAlpha, bool bBackground);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _FadeToColor FadeToColor;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate HmdColor_t _GetCurrentFadeColor(bool bBackground);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetCurrentFadeColor GetCurrentFadeColor;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _FadeGrid(float fSeconds, bool bFadeIn);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _FadeGrid FadeGrid;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate float _GetCurrentGridAlpha();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetCurrentGridAlpha GetCurrentGridAlpha;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRCompositorError _SetSkyboxOverride([In, Out] Texture_t[] pTextures, uint unTextureCount);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetSkyboxOverride SetSkyboxOverride;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _ClearSkyboxOverride();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ClearSkyboxOverride ClearSkyboxOverride;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _CompositorBringToFront();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _CompositorBringToFront CompositorBringToFront;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _CompositorGoToBack();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _CompositorGoToBack CompositorGoToBack;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _CompositorQuit();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _CompositorQuit CompositorQuit;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _IsFullscreen();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _IsFullscreen IsFullscreen;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetCurrentSceneFocusProcess();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetCurrentSceneFocusProcess GetCurrentSceneFocusProcess;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetLastFrameRenderer();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetLastFrameRenderer GetLastFrameRenderer;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _CanRenderScene();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _CanRenderScene CanRenderScene;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _ShowMirrorWindow();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ShowMirrorWindow ShowMirrorWindow;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _HideMirrorWindow();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _HideMirrorWindow HideMirrorWindow;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _IsMirrorWindowVisible();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _IsMirrorWindowVisible IsMirrorWindowVisible;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _CompositorDumpImages();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _CompositorDumpImages CompositorDumpImages;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _ShouldAppRenderWithLowResources();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ShouldAppRenderWithLowResources ShouldAppRenderWithLowResources;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _ForceInterleavedReprojectionOn(bool bOverride);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ForceInterleavedReprojectionOn ForceInterleavedReprojectionOn;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _ForceReconnectProcess();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ForceReconnectProcess ForceReconnectProcess;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _SuspendRendering(bool bSuspend);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SuspendRendering SuspendRendering;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRCompositorError _GetMirrorTextureD3D11(EVREye eEye, IntPtr pD3D11DeviceOrResource, ref IntPtr ppD3D11ShaderResourceView);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetMirrorTextureD3D11 GetMirrorTextureD3D11;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _ReleaseMirrorTextureD3D11(IntPtr pD3D11ShaderResourceView);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ReleaseMirrorTextureD3D11 ReleaseMirrorTextureD3D11;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRCompositorError _GetMirrorTextureGL(EVREye eEye, ref uint pglTextureId, IntPtr pglSharedTextureHandle);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetMirrorTextureGL GetMirrorTextureGL;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _ReleaseSharedGLTexture(uint glTextureId, IntPtr glSharedTextureHandle);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ReleaseSharedGLTexture ReleaseSharedGLTexture;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _LockGLSharedTextureForAccess(IntPtr glSharedTextureHandle);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _LockGLSharedTextureForAccess LockGLSharedTextureForAccess;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _UnlockGLSharedTextureForAccess(IntPtr glSharedTextureHandle);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _UnlockGLSharedTextureForAccess UnlockGLSharedTextureForAccess;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetVulkanInstanceExtensionsRequired(System.Text.StringBuilder pchValue, uint unBufferSize);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetVulkanInstanceExtensionsRequired GetVulkanInstanceExtensionsRequired;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetVulkanDeviceExtensionsRequired(IntPtr pPhysicalDevice, System.Text.StringBuilder pchValue, uint unBufferSize);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetVulkanDeviceExtensionsRequired GetVulkanDeviceExtensionsRequired;

}

[StructLayout(LayoutKind.Sequential)]
public struct IVROverlay
{
       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _FindOverlay(string pchOverlayKey, ref ulong pOverlayHandle);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _FindOverlay FindOverlay;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _CreateOverlay(string pchOverlayKey, string pchOverlayFriendlyName, ref ulong pOverlayHandle);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _CreateOverlay CreateOverlay;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _DestroyOverlay(ulong ulOverlayHandle);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _DestroyOverlay DestroyOverlay;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _SetHighQualityOverlay(ulong ulOverlayHandle);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetHighQualityOverlay SetHighQualityOverlay;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate ulong _GetHighQualityOverlay();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetHighQualityOverlay GetHighQualityOverlay;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetOverlayKey(ulong ulOverlayHandle, System.Text.StringBuilder pchValue, uint unBufferSize, ref EVROverlayError pError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetOverlayKey GetOverlayKey;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetOverlayName(ulong ulOverlayHandle, System.Text.StringBuilder pchValue, uint unBufferSize, ref EVROverlayError pError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetOverlayName GetOverlayName;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _GetOverlayImageData(ulong ulOverlayHandle, IntPtr pvBuffer, uint unBufferSize, ref uint punWidth, ref uint punHeight);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetOverlayImageData GetOverlayImageData;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate IntPtr _GetOverlayErrorNameFromEnum(EVROverlayError error);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetOverlayErrorNameFromEnum GetOverlayErrorNameFromEnum;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _SetOverlayRenderingPid(ulong ulOverlayHandle, uint unPID);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetOverlayRenderingPid SetOverlayRenderingPid;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetOverlayRenderingPid(ulong ulOverlayHandle);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetOverlayRenderingPid GetOverlayRenderingPid;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _SetOverlayFlag(ulong ulOverlayHandle, VROverlayFlags eOverlayFlag, bool bEnabled);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetOverlayFlag SetOverlayFlag;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _GetOverlayFlag(ulong ulOverlayHandle, VROverlayFlags eOverlayFlag, ref bool pbEnabled);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetOverlayFlag GetOverlayFlag;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _SetOverlayColor(ulong ulOverlayHandle, float fRed, float fGreen, float fBlue);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetOverlayColor SetOverlayColor;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _GetOverlayColor(ulong ulOverlayHandle, ref float pfRed, ref float pfGreen, ref float pfBlue);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetOverlayColor GetOverlayColor;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _SetOverlayAlpha(ulong ulOverlayHandle, float fAlpha);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetOverlayAlpha SetOverlayAlpha;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _GetOverlayAlpha(ulong ulOverlayHandle, ref float pfAlpha);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetOverlayAlpha GetOverlayAlpha;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _SetOverlayTexelAspect(ulong ulOverlayHandle, float fTexelAspect);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetOverlayTexelAspect SetOverlayTexelAspect;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _GetOverlayTexelAspect(ulong ulOverlayHandle, ref float pfTexelAspect);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetOverlayTexelAspect GetOverlayTexelAspect;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _SetOverlaySortOrder(ulong ulOverlayHandle, uint unSortOrder);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetOverlaySortOrder SetOverlaySortOrder;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _GetOverlaySortOrder(ulong ulOverlayHandle, ref uint punSortOrder);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetOverlaySortOrder GetOverlaySortOrder;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _SetOverlayWidthInMeters(ulong ulOverlayHandle, float fWidthInMeters);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetOverlayWidthInMeters SetOverlayWidthInMeters;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _GetOverlayWidthInMeters(ulong ulOverlayHandle, ref float pfWidthInMeters);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetOverlayWidthInMeters GetOverlayWidthInMeters;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _SetOverlayAutoCurveDistanceRangeInMeters(ulong ulOverlayHandle, float fMinDistanceInMeters, float fMaxDistanceInMeters);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetOverlayAutoCurveDistanceRangeInMeters SetOverlayAutoCurveDistanceRangeInMeters;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _GetOverlayAutoCurveDistanceRangeInMeters(ulong ulOverlayHandle, ref float pfMinDistanceInMeters, ref float pfMaxDistanceInMeters);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetOverlayAutoCurveDistanceRangeInMeters GetOverlayAutoCurveDistanceRangeInMeters;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _SetOverlayTextureColorSpace(ulong ulOverlayHandle, EColorSpace eTextureColorSpace);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetOverlayTextureColorSpace SetOverlayTextureColorSpace;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _GetOverlayTextureColorSpace(ulong ulOverlayHandle, ref EColorSpace peTextureColorSpace);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetOverlayTextureColorSpace GetOverlayTextureColorSpace;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _SetOverlayTextureBounds(ulong ulOverlayHandle, ref VRTextureBounds_t pOverlayTextureBounds);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetOverlayTextureBounds SetOverlayTextureBounds;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _GetOverlayTextureBounds(ulong ulOverlayHandle, ref VRTextureBounds_t pOverlayTextureBounds);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetOverlayTextureBounds GetOverlayTextureBounds;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _GetOverlayTransformType(ulong ulOverlayHandle, ref VROverlayTransformType peTransformType);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetOverlayTransformType GetOverlayTransformType;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _SetOverlayTransformAbsolute(ulong ulOverlayHandle, ETrackingUniverseOrigin eTrackingOrigin, ref HmdMatrix34_t pmatTrackingOriginToOverlayTransform);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetOverlayTransformAbsolute SetOverlayTransformAbsolute;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _GetOverlayTransformAbsolute(ulong ulOverlayHandle, ref ETrackingUniverseOrigin peTrackingOrigin, ref HmdMatrix34_t pmatTrackingOriginToOverlayTransform);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetOverlayTransformAbsolute GetOverlayTransformAbsolute;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _SetOverlayTransformTrackedDeviceRelative(ulong ulOverlayHandle, uint unTrackedDevice, ref HmdMatrix34_t pmatTrackedDeviceToOverlayTransform);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetOverlayTransformTrackedDeviceRelative SetOverlayTransformTrackedDeviceRelative;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _GetOverlayTransformTrackedDeviceRelative(ulong ulOverlayHandle, ref uint punTrackedDevice, ref HmdMatrix34_t pmatTrackedDeviceToOverlayTransform);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetOverlayTransformTrackedDeviceRelative GetOverlayTransformTrackedDeviceRelative;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _SetOverlayTransformTrackedDeviceComponent(ulong ulOverlayHandle, uint unDeviceIndex, string pchComponentName);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetOverlayTransformTrackedDeviceComponent SetOverlayTransformTrackedDeviceComponent;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _GetOverlayTransformTrackedDeviceComponent(ulong ulOverlayHandle, ref uint punDeviceIndex, string pchComponentName, uint unComponentNameSize);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetOverlayTransformTrackedDeviceComponent GetOverlayTransformTrackedDeviceComponent;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _ShowOverlay(ulong ulOverlayHandle);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ShowOverlay ShowOverlay;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _HideOverlay(ulong ulOverlayHandle);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _HideOverlay HideOverlay;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _IsOverlayVisible(ulong ulOverlayHandle);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _IsOverlayVisible IsOverlayVisible;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _GetTransformForOverlayCoordinates(ulong ulOverlayHandle, ETrackingUniverseOrigin eTrackingOrigin, HmdVector2_t coordinatesInOverlay, ref HmdMatrix34_t pmatTransform);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetTransformForOverlayCoordinates GetTransformForOverlayCoordinates;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _PollNextOverlayEvent(ulong ulOverlayHandle, ref VREvent_t pEvent, uint uncbVREvent);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _PollNextOverlayEvent PollNextOverlayEvent;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _GetOverlayInputMethod(ulong ulOverlayHandle, ref VROverlayInputMethod peInputMethod);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetOverlayInputMethod GetOverlayInputMethod;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _SetOverlayInputMethod(ulong ulOverlayHandle, VROverlayInputMethod eInputMethod);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetOverlayInputMethod SetOverlayInputMethod;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _GetOverlayMouseScale(ulong ulOverlayHandle, ref HmdVector2_t pvecMouseScale);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetOverlayMouseScale GetOverlayMouseScale;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _SetOverlayMouseScale(ulong ulOverlayHandle, ref HmdVector2_t pvecMouseScale);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetOverlayMouseScale SetOverlayMouseScale;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _ComputeOverlayIntersection(ulong ulOverlayHandle, ref VROverlayIntersectionParams_t pParams, ref VROverlayIntersectionResults_t pResults);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ComputeOverlayIntersection ComputeOverlayIntersection;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _HandleControllerOverlayInteractionAsMouse(ulong ulOverlayHandle, uint unControllerDeviceIndex);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _HandleControllerOverlayInteractionAsMouse HandleControllerOverlayInteractionAsMouse;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _IsHoverTargetOverlay(ulong ulOverlayHandle);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _IsHoverTargetOverlay IsHoverTargetOverlay;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate ulong _GetGamepadFocusOverlay();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetGamepadFocusOverlay GetGamepadFocusOverlay;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _SetGamepadFocusOverlay(ulong ulNewFocusOverlay);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetGamepadFocusOverlay SetGamepadFocusOverlay;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _SetOverlayNeighbor(EOverlayDirection eDirection, ulong ulFrom, ulong ulTo);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetOverlayNeighbor SetOverlayNeighbor;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _MoveGamepadFocusToNeighbor(EOverlayDirection eDirection, ulong ulFrom);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _MoveGamepadFocusToNeighbor MoveGamepadFocusToNeighbor;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _SetOverlayTexture(ulong ulOverlayHandle, ref Texture_t pTexture);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetOverlayTexture SetOverlayTexture;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _ClearOverlayTexture(ulong ulOverlayHandle);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ClearOverlayTexture ClearOverlayTexture;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _SetOverlayRaw(ulong ulOverlayHandle, IntPtr pvBuffer, uint unWidth, uint unHeight, uint unDepth);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetOverlayRaw SetOverlayRaw;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _SetOverlayFromFile(ulong ulOverlayHandle, string pchFilePath);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetOverlayFromFile SetOverlayFromFile;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _GetOverlayTexture(ulong ulOverlayHandle, ref IntPtr pNativeTextureHandle, IntPtr pNativeTextureRef, ref uint pWidth, ref uint pHeight, ref uint pNativeFormat, ref ETextureType pAPIType, ref EColorSpace pColorSpace, ref VRTextureBounds_t pTextureBounds);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetOverlayTexture GetOverlayTexture;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _ReleaseNativeOverlayHandle(ulong ulOverlayHandle, IntPtr pNativeTextureHandle);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ReleaseNativeOverlayHandle ReleaseNativeOverlayHandle;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _GetOverlayTextureSize(ulong ulOverlayHandle, ref uint pWidth, ref uint pHeight);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetOverlayTextureSize GetOverlayTextureSize;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _CreateDashboardOverlay(string pchOverlayKey, string pchOverlayFriendlyName, ref ulong pMainHandle, ref ulong pThumbnailHandle);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _CreateDashboardOverlay CreateDashboardOverlay;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _IsDashboardVisible();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _IsDashboardVisible IsDashboardVisible;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _IsActiveDashboardOverlay(ulong ulOverlayHandle);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _IsActiveDashboardOverlay IsActiveDashboardOverlay;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _SetDashboardOverlaySceneProcess(ulong ulOverlayHandle, uint unProcessId);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetDashboardOverlaySceneProcess SetDashboardOverlaySceneProcess;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _GetDashboardOverlaySceneProcess(ulong ulOverlayHandle, ref uint punProcessId);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetDashboardOverlaySceneProcess GetDashboardOverlaySceneProcess;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _ShowDashboard(string pchOverlayToShow);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ShowDashboard ShowDashboard;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetPrimaryDashboardDevice();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetPrimaryDashboardDevice GetPrimaryDashboardDevice;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _ShowKeyboard(int eInputMode, int eLineInputMode, string pchDescription, uint unCharMax, string pchExistingText, bool bUseMinimalMode, ulong uUserValue);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ShowKeyboard ShowKeyboard;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _ShowKeyboardForOverlay(ulong ulOverlayHandle, int eInputMode, int eLineInputMode, string pchDescription, uint unCharMax, string pchExistingText, bool bUseMinimalMode, ulong uUserValue);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ShowKeyboardForOverlay ShowKeyboardForOverlay;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetKeyboardText(System.Text.StringBuilder pchText, uint cchText);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetKeyboardText GetKeyboardText;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _HideKeyboard();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _HideKeyboard HideKeyboard;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _SetKeyboardTransformAbsolute(ETrackingUniverseOrigin eTrackingOrigin, ref HmdMatrix34_t pmatTrackingOriginToKeyboardTransform);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetKeyboardTransformAbsolute SetKeyboardTransformAbsolute;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _SetKeyboardPositionForOverlay(ulong ulOverlayHandle, HmdRect2_t avoidRect);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetKeyboardPositionForOverlay SetKeyboardPositionForOverlay;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _SetOverlayIntersectionMask(ulong ulOverlayHandle, ref VROverlayIntersectionMaskPrimitive_t pMaskPrimitives, uint unNumMaskPrimitives, uint unPrimitiveSize);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetOverlayIntersectionMask SetOverlayIntersectionMask;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVROverlayError _GetOverlayFlags(ulong ulOverlayHandle, ref uint pFlags);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetOverlayFlags GetOverlayFlags;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate VRMessageOverlayResponse _ShowMessageOverlay(string pchText, string pchCaption, string pchButton0Text, string pchButton1Text, string pchButton2Text, string pchButton3Text);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _ShowMessageOverlay ShowMessageOverlay;

}

[StructLayout(LayoutKind.Sequential)]
public struct IVRRenderModels
{
       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRRenderModelError _LoadRenderModel_Async(string pchRenderModelName, ref IntPtr ppRenderModel);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _LoadRenderModel_Async LoadRenderModel_Async;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _FreeRenderModel(IntPtr pRenderModel);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _FreeRenderModel FreeRenderModel;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRRenderModelError _LoadTexture_Async(int textureId, ref IntPtr ppTexture);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _LoadTexture_Async LoadTexture_Async;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _FreeTexture(IntPtr pTexture);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _FreeTexture FreeTexture;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRRenderModelError _LoadTextureD3D11_Async(int textureId, IntPtr pD3D11Device, ref IntPtr ppD3D11Texture2D);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _LoadTextureD3D11_Async LoadTextureD3D11_Async;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRRenderModelError _LoadIntoTextureD3D11_Async(int textureId, IntPtr pDstTexture);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _LoadIntoTextureD3D11_Async LoadIntoTextureD3D11_Async;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _FreeTextureD3D11(IntPtr pD3D11Texture2D);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _FreeTextureD3D11 FreeTextureD3D11;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetRenderModelName(uint unRenderModelIndex, System.Text.StringBuilder pchRenderModelName, uint unRenderModelNameLen);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetRenderModelName GetRenderModelName;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetRenderModelCount();
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetRenderModelCount GetRenderModelCount;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetComponentCount(string pchRenderModelName);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetComponentCount GetComponentCount;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetComponentName(string pchRenderModelName, uint unComponentIndex, System.Text.StringBuilder pchComponentName, uint unComponentNameLen);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetComponentName GetComponentName;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate ulong _GetComponentButtonMask(string pchRenderModelName, string pchComponentName);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetComponentButtonMask GetComponentButtonMask;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetComponentRenderModelName(string pchRenderModelName, string pchComponentName, System.Text.StringBuilder pchComponentRenderModelName, uint unComponentRenderModelNameLen);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetComponentRenderModelName GetComponentRenderModelName;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetComponentState(string pchRenderModelName, string pchComponentName, ref VRControllerState_t pControllerState, ref RenderModel_ControllerMode_State_t pState, ref RenderModel_ComponentState_t pComponentState);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetComponentState GetComponentState;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _RenderModelHasComponent(string pchRenderModelName, string pchComponentName);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _RenderModelHasComponent RenderModelHasComponent;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetRenderModelThumbnailURL(string pchRenderModelName, System.Text.StringBuilder pchThumbnailURL, uint unThumbnailURLLen, ref EVRRenderModelError peError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetRenderModelThumbnailURL GetRenderModelThumbnailURL;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetRenderModelOriginalPath(string pchRenderModelName, System.Text.StringBuilder pchOriginalPath, uint unOriginalPathLen, ref EVRRenderModelError peError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetRenderModelOriginalPath GetRenderModelOriginalPath;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate IntPtr _GetRenderModelErrorNameFromEnum(EVRRenderModelError error);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetRenderModelErrorNameFromEnum GetRenderModelErrorNameFromEnum;

}

[StructLayout(LayoutKind.Sequential)]
public struct IVRNotifications
{
       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRNotificationError _CreateNotification(ulong ulOverlayHandle, ulong ulUserValue, EVRNotificationType type, string pchText, EVRNotificationStyle style, ref NotificationBitmap_t pImage, ref uint pNotificationId);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _CreateNotification CreateNotification;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRNotificationError _RemoveNotification(uint notificationId);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _RemoveNotification RemoveNotification;

}

[StructLayout(LayoutKind.Sequential)]
public struct IVRSettings
{
       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate IntPtr _GetSettingsErrorNameFromEnum(EVRSettingsError eError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetSettingsErrorNameFromEnum GetSettingsErrorNameFromEnum;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _Sync(bool bForce, ref EVRSettingsError peError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _Sync Sync;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _SetBool(string pchSection, string pchSettingsKey, bool bValue, ref EVRSettingsError peError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetBool SetBool;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _SetInt32(string pchSection, string pchSettingsKey, int nValue, ref EVRSettingsError peError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetInt32 SetInt32;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _SetFloat(string pchSection, string pchSettingsKey, float flValue, ref EVRSettingsError peError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetFloat SetFloat;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _SetString(string pchSection, string pchSettingsKey, string pchValue, ref EVRSettingsError peError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SetString SetString;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetBool(string pchSection, string pchSettingsKey, ref EVRSettingsError peError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetBool GetBool;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate int _GetInt32(string pchSection, string pchSettingsKey, ref EVRSettingsError peError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetInt32 GetInt32;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate float _GetFloat(string pchSection, string pchSettingsKey, ref EVRSettingsError peError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetFloat GetFloat;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _GetString(string pchSection, string pchSettingsKey, System.Text.StringBuilder pchValue, uint unValueLen, ref EVRSettingsError peError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetString GetString;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _RemoveSection(string pchSection, ref EVRSettingsError peError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _RemoveSection RemoveSection;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate void _RemoveKeyInSection(string pchSection, string pchSettingsKey, ref EVRSettingsError peError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _RemoveKeyInSection RemoveKeyInSection;

}

[StructLayout(LayoutKind.Sequential)]
public struct IVRScreenshots
{
       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRScreenshotError _RequestScreenshot(ref uint pOutScreenshotHandle, EVRScreenshotType type, string pchPreviewFilename, string pchVRFilename);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _RequestScreenshot RequestScreenshot;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRScreenshotError _HookScreenshot([In, Out] EVRScreenshotType[] pSupportedTypes, int numTypes);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _HookScreenshot HookScreenshot;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRScreenshotType _GetScreenshotPropertyType(uint screenshotHandle, ref EVRScreenshotError pError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetScreenshotPropertyType GetScreenshotPropertyType;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetScreenshotPropertyFilename(uint screenshotHandle, EVRScreenshotPropertyFilenames filenameType, System.Text.StringBuilder pchFilename, uint cchFilename, ref EVRScreenshotError pError);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetScreenshotPropertyFilename GetScreenshotPropertyFilename;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRScreenshotError _UpdateScreenshotProgress(uint screenshotHandle, float flProgress);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _UpdateScreenshotProgress UpdateScreenshotProgress;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRScreenshotError _TakeStereoScreenshot(ref uint pOutScreenshotHandle, string pchPreviewFilename, string pchVRFilename);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _TakeStereoScreenshot TakeStereoScreenshot;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate EVRScreenshotError _SubmitScreenshot(uint screenshotHandle, EVRScreenshotType type, string pchSourcePreviewFilename, string pchSourceVRFilename);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _SubmitScreenshot SubmitScreenshot;

}

[StructLayout(LayoutKind.Sequential)]
public struct IVRResources
{
       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _LoadSharedResource(string pchResourceName, string pchBuffer, uint unBufferLen);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _LoadSharedResource LoadSharedResource;

       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate uint _GetResourceFullPath(string pchResourceName, string pchResourceTypeDirectory, string pchPathBuffer, uint unBufferLen);
       [MarshalAs(UnmanagedType.FunctionPtr)]
       internal _GetResourceFullPath GetResourceFullPath;

}


public class CVRSystem
{
       IVRSystem FnTable;
       internal CVRSystem(IntPtr pInterface)
       {
              FnTable = (IVRSystem)Marshal.PtrToStructure(pInterface, typeof(IVRSystem));
       }
       public void GetRecommendedRenderTargetSize(ref uint pnWidth,ref uint pnHeight)
       {
              pnWidth = 0;
              pnHeight = 0;
              FnTable.GetRecommendedRenderTargetSize(ref pnWidth,ref pnHeight);
       }
       public HmdMatrix44_t GetProjectionMatrix(EVREye eEye,float fNearZ,float fFarZ)
       {
              HmdMatrix44_t result = FnTable.GetProjectionMatrix(eEye,fNearZ,fFarZ);
              return result;
       }
       public void GetProjectionRaw(EVREye eEye,ref float pfLeft,ref float pfRight,ref float pfTop,ref float pfBottom)
       {
              pfLeft = 0;
              pfRight = 0;
              pfTop = 0;
              pfBottom = 0;
              FnTable.GetProjectionRaw(eEye,ref pfLeft,ref pfRight,ref pfTop,ref pfBottom);
       }
       public bool ComputeDistortion(EVREye eEye,float fU,float fV,ref DistortionCoordinates_t pDistortionCoordinates)
       {
              bool result = FnTable.ComputeDistortion(eEye,fU,fV,ref pDistortionCoordinates);
              return result;
       }
       public HmdMatrix34_t GetEyeToHeadTransform(EVREye eEye)
       {
              HmdMatrix34_t result = FnTable.GetEyeToHeadTransform(eEye);
              return result;
       }
       public bool GetTimeSinceLastVsync(ref float pfSecondsSinceLastVsync,ref ulong pulFrameCounter)
       {
              pfSecondsSinceLastVsync = 0;
              pulFrameCounter = 0;
              bool result = FnTable.GetTimeSinceLastVsync(ref pfSecondsSinceLastVsync,ref pulFrameCounter);
              return result;
       }
       public int GetD3D9AdapterIndex()
       {
              int result = FnTable.GetD3D9AdapterIndex();
              return result;
       }
       public void GetDXGIOutputInfo(ref int pnAdapterIndex)
       {
              pnAdapterIndex = 0;
              FnTable.GetDXGIOutputInfo(ref pnAdapterIndex);
       }
       public bool IsDisplayOnDesktop()
       {
              bool result = FnTable.IsDisplayOnDesktop();
              return result;
       }
       public bool SetDisplayVisibility(bool bIsVisibleOnDesktop)
       {
              bool result = FnTable.SetDisplayVisibility(bIsVisibleOnDesktop);
              return result;
       }
       public void GetDeviceToAbsoluteTrackingPose(ETrackingUniverseOrigin eOrigin,float fPredictedSecondsToPhotonsFromNow,TrackedDevicePose_t [] pTrackedDevicePoseArray)
       {
              FnTable.GetDeviceToAbsoluteTrackingPose(eOrigin,fPredictedSecondsToPhotonsFromNow,pTrackedDevicePoseArray,(uint) pTrackedDevicePoseArray.Length);
       }
       public void ResetSeatedZeroPose()
       {
              FnTable.ResetSeatedZeroPose();
       }
       public HmdMatrix34_t GetSeatedZeroPoseToStandingAbsoluteTrackingPose()
       {
              HmdMatrix34_t result = FnTable.GetSeatedZeroPoseToStandingAbsoluteTrackingPose();
              return result;
       }
       public HmdMatrix34_t GetRawZeroPoseToStandingAbsoluteTrackingPose()
       {
              HmdMatrix34_t result = FnTable.GetRawZeroPoseToStandingAbsoluteTrackingPose();
              return result;
       }
       public uint GetSortedTrackedDeviceIndicesOfClass(ETrackedDeviceClass eTrackedDeviceClass,uint [] punTrackedDeviceIndexArray,uint unRelativeToTrackedDeviceIndex)
       {
              uint result = FnTable.GetSortedTrackedDeviceIndicesOfClass(eTrackedDeviceClass,punTrackedDeviceIndexArray,(uint) punTrackedDeviceIndexArray.Length,unRelativeToTrackedDeviceIndex);
              return result;
       }
       public EDeviceActivityLevel GetTrackedDeviceActivityLevel(uint unDeviceId)
       {
              EDeviceActivityLevel result = FnTable.GetTrackedDeviceActivityLevel(unDeviceId);
              return result;
       }
       public void ApplyTransform(ref TrackedDevicePose_t pOutputPose,ref TrackedDevicePose_t pTrackedDevicePose,ref HmdMatrix34_t pTransform)
       {
              FnTable.ApplyTransform(ref pOutputPose,ref pTrackedDevicePose,ref pTransform);
       }
       public uint GetTrackedDeviceIndexForControllerRole(ETrackedControllerRole unDeviceType)
       {
              uint result = FnTable.GetTrackedDeviceIndexForControllerRole(unDeviceType);
              return result;
       }
       public ETrackedControllerRole GetControllerRoleForTrackedDeviceIndex(uint unDeviceIndex)
       {
              ETrackedControllerRole result = FnTable.GetControllerRoleForTrackedDeviceIndex(unDeviceIndex);
              return result;
       }
       public ETrackedDeviceClass GetTrackedDeviceClass(uint unDeviceIndex)
       {
              ETrackedDeviceClass result = FnTable.GetTrackedDeviceClass(unDeviceIndex);
              return result;
       }
       public bool IsTrackedDeviceConnected(uint unDeviceIndex)
       {
              bool result = FnTable.IsTrackedDeviceConnected(unDeviceIndex);
              return result;
       }
       public bool GetBoolTrackedDeviceProperty(uint unDeviceIndex,ETrackedDeviceProperty prop,ref ETrackedPropertyError pError)
       {
              bool result = FnTable.GetBoolTrackedDeviceProperty(unDeviceIndex,prop,ref pError);
              return result;
       }
       public float GetFloatTrackedDeviceProperty(uint unDeviceIndex,ETrackedDeviceProperty prop,ref ETrackedPropertyError pError)
       {
              float result = FnTable.GetFloatTrackedDeviceProperty(unDeviceIndex,prop,ref pError);
              return result;
       }
       public int GetInt32TrackedDeviceProperty(uint unDeviceIndex,ETrackedDeviceProperty prop,ref ETrackedPropertyError pError)
       {
              int result = FnTable.GetInt32TrackedDeviceProperty(unDeviceIndex,prop,ref pError);
              return result;
       }
       public ulong GetUint64TrackedDeviceProperty(uint unDeviceIndex,ETrackedDeviceProperty prop,ref ETrackedPropertyError pError)
       {
              ulong result = FnTable.GetUint64TrackedDeviceProperty(unDeviceIndex,prop,ref pError);
              return result;
       }
       public HmdMatrix34_t GetMatrix34TrackedDeviceProperty(uint unDeviceIndex,ETrackedDeviceProperty prop,ref ETrackedPropertyError pError)
       {
              HmdMatrix34_t result = FnTable.GetMatrix34TrackedDeviceProperty(unDeviceIndex,prop,ref pError);
              return result;
       }
       public uint GetStringTrackedDeviceProperty(uint unDeviceIndex,ETrackedDeviceProperty prop,System.Text.StringBuilder pchValue,uint unBufferSize,ref ETrackedPropertyError pError)
       {
              uint result = FnTable.GetStringTrackedDeviceProperty(unDeviceIndex,prop,pchValue,unBufferSize,ref pError);
              return result;
       }
       public string GetPropErrorNameFromEnum(ETrackedPropertyError error)
       {
              IntPtr result = FnTable.GetPropErrorNameFromEnum(error);
              return Marshal.PtrToStringAnsi(result);
       }
       public bool PollNextEvent(ref VREvent_t pEvent,uint uncbVREvent)
       {
              bool result = FnTable.PollNextEvent(ref pEvent,uncbVREvent);
              return result;
       }
       public bool PollNextEventWithPose(ETrackingUniverseOrigin eOrigin,ref VREvent_t pEvent,uint uncbVREvent,ref TrackedDevicePose_t pTrackedDevicePose)
       {
              bool result = FnTable.PollNextEventWithPose(eOrigin,ref pEvent,uncbVREvent,ref pTrackedDevicePose);
              return result;
       }
       public string GetEventTypeNameFromEnum(EVREventType eType)
       {
              IntPtr result = FnTable.GetEventTypeNameFromEnum(eType);
              return Marshal.PtrToStringAnsi(result);
       }
       public HiddenAreaMesh_t GetHiddenAreaMesh(EVREye eEye,EHiddenAreaMeshType type)
       {
              HiddenAreaMesh_t result = FnTable.GetHiddenAreaMesh(eEye,type);
              return result;
       }
// This is a terrible hack to workaround the fact that VRControllerState_t was
// originally mis-compiled with the wrong packing for Linux and OSX.
       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetControllerStatePacked(uint unControllerDeviceIndex,ref VRControllerState_t_Packed pControllerState,uint unControllerStateSize);
       [StructLayout(LayoutKind.Explicit)]
       struct GetControllerStateUnion
       {
              [FieldOffset(0)]
              public IVRSystem._GetControllerState pGetControllerState;
              [FieldOffset(0)]
              public _GetControllerStatePacked pGetControllerStatePacked;
       }
       public bool GetControllerState(uint unControllerDeviceIndex,ref VRControllerState_t pControllerState,uint unControllerStateSize)
       {
              if ((System.Environment.OSVersion.Platform == System.PlatformID.MacOSX) ||
                            (System.Environment.OSVersion.Platform == System.PlatformID.Unix))
              {
                     GetControllerStateUnion u;
                     VRControllerState_t_Packed state_packed = new VRControllerState_t_Packed();
                     u.pGetControllerStatePacked = null;
                     u.pGetControllerState = FnTable.GetControllerState;
                     bool packed_result = u.pGetControllerStatePacked(unControllerDeviceIndex,ref state_packed,(uint)System.Runtime.InteropServices.Marshal.SizeOf(typeof(VRControllerState_t_Packed)));

                     state_packed.Unpack(ref pControllerState);
                     return packed_result;
              }
              bool result = FnTable.GetControllerState(unControllerDeviceIndex,ref pControllerState,unControllerStateSize);
              return result;
       }
// This is a terrible hack to workaround the fact that VRControllerState_t was
// originally mis-compiled with the wrong packing for Linux and OSX.
       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetControllerStateWithPosePacked(ETrackingUniverseOrigin eOrigin,uint unControllerDeviceIndex,ref VRControllerState_t_Packed pControllerState,uint unControllerStateSize,ref TrackedDevicePose_t pTrackedDevicePose);
       [StructLayout(LayoutKind.Explicit)]
       struct GetControllerStateWithPoseUnion
       {
              [FieldOffset(0)]
              public IVRSystem._GetControllerStateWithPose pGetControllerStateWithPose;
              [FieldOffset(0)]
              public _GetControllerStateWithPosePacked pGetControllerStateWithPosePacked;
       }
       public bool GetControllerStateWithPose(ETrackingUniverseOrigin eOrigin,uint unControllerDeviceIndex,ref VRControllerState_t pControllerState,uint unControllerStateSize,ref TrackedDevicePose_t pTrackedDevicePose)
       {
              if ((System.Environment.OSVersion.Platform == System.PlatformID.MacOSX) ||
                            (System.Environment.OSVersion.Platform == System.PlatformID.Unix))
              {
                     GetControllerStateWithPoseUnion u;
                     VRControllerState_t_Packed state_packed = new VRControllerState_t_Packed();
                     u.pGetControllerStateWithPosePacked = null;
                     u.pGetControllerStateWithPose = FnTable.GetControllerStateWithPose;
                     bool packed_result = u.pGetControllerStateWithPosePacked(eOrigin,unControllerDeviceIndex,ref state_packed,(uint)System.Runtime.InteropServices.Marshal.SizeOf(typeof(VRControllerState_t_Packed)),ref pTrackedDevicePose);

                     state_packed.Unpack(ref pControllerState);
                     return packed_result;
              }
              bool result = FnTable.GetControllerStateWithPose(eOrigin,unControllerDeviceIndex,ref pControllerState,unControllerStateSize,ref pTrackedDevicePose);
              return result;
       }
       public void TriggerHapticPulse(uint unControllerDeviceIndex,uint unAxisId,char usDurationMicroSec)
       {
              FnTable.TriggerHapticPulse(unControllerDeviceIndex,unAxisId,usDurationMicroSec);
       }
       public string GetButtonIdNameFromEnum(EVRButtonId eButtonId)
       {
              IntPtr result = FnTable.GetButtonIdNameFromEnum(eButtonId);
              return Marshal.PtrToStringAnsi(result);
       }
       public string GetControllerAxisTypeNameFromEnum(EVRControllerAxisType eAxisType)
       {
              IntPtr result = FnTable.GetControllerAxisTypeNameFromEnum(eAxisType);
              return Marshal.PtrToStringAnsi(result);
       }
       public bool CaptureInputFocus()
       {
              bool result = FnTable.CaptureInputFocus();
              return result;
       }
       public void ReleaseInputFocus()
       {
              FnTable.ReleaseInputFocus();
       }
       public bool IsInputFocusCapturedByAnotherProcess()
       {
              bool result = FnTable.IsInputFocusCapturedByAnotherProcess();
              return result;
       }
       public uint DriverDebugRequest(uint unDeviceIndex,string pchRequest,string pchResponseBuffer,uint unResponseBufferSize)
       {
              uint result = FnTable.DriverDebugRequest(unDeviceIndex,pchRequest,pchResponseBuffer,unResponseBufferSize);
              return result;
       }
       public EVRFirmwareError PerformFirmwareUpdate(uint unDeviceIndex)
       {
              EVRFirmwareError result = FnTable.PerformFirmwareUpdate(unDeviceIndex);
              return result;
       }
       public void AcknowledgeQuit_Exiting()
       {
              FnTable.AcknowledgeQuit_Exiting();
       }
       public void AcknowledgeQuit_UserPrompt()
       {
              FnTable.AcknowledgeQuit_UserPrompt();
       }
}


public class CVRExtendedDisplay
{
       IVRExtendedDisplay FnTable;
       internal CVRExtendedDisplay(IntPtr pInterface)
       {
              FnTable = (IVRExtendedDisplay)Marshal.PtrToStructure(pInterface, typeof(IVRExtendedDisplay));
       }
       public void GetWindowBounds(ref int pnX,ref int pnY,ref uint pnWidth,ref uint pnHeight)
       {
              pnX = 0;
              pnY = 0;
              pnWidth = 0;
              pnHeight = 0;
              FnTable.GetWindowBounds(ref pnX,ref pnY,ref pnWidth,ref pnHeight);
       }
       public void GetEyeOutputViewport(EVREye eEye,ref uint pnX,ref uint pnY,ref uint pnWidth,ref uint pnHeight)
       {
              pnX = 0;
              pnY = 0;
              pnWidth = 0;
              pnHeight = 0;
              FnTable.GetEyeOutputViewport(eEye,ref pnX,ref pnY,ref pnWidth,ref pnHeight);
       }
       public void GetDXGIOutputInfo(ref int pnAdapterIndex,ref int pnAdapterOutputIndex)
       {
              pnAdapterIndex = 0;
              pnAdapterOutputIndex = 0;
              FnTable.GetDXGIOutputInfo(ref pnAdapterIndex,ref pnAdapterOutputIndex);
       }
}


public class CVRTrackedCamera
{
       IVRTrackedCamera FnTable;
       internal CVRTrackedCamera(IntPtr pInterface)
       {
              FnTable = (IVRTrackedCamera)Marshal.PtrToStructure(pInterface, typeof(IVRTrackedCamera));
       }
       public string GetCameraErrorNameFromEnum(EVRTrackedCameraError eCameraError)
       {
              IntPtr result = FnTable.GetCameraErrorNameFromEnum(eCameraError);
              return Marshal.PtrToStringAnsi(result);
       }
       public EVRTrackedCameraError HasCamera(uint nDeviceIndex,ref bool pHasCamera)
       {
              pHasCamera = false;
              EVRTrackedCameraError result = FnTable.HasCamera(nDeviceIndex,ref pHasCamera);
              return result;
       }
       public EVRTrackedCameraError GetCameraFrameSize(uint nDeviceIndex,EVRTrackedCameraFrameType eFrameType,ref uint pnWidth,ref uint pnHeight,ref uint pnFrameBufferSize)
       {
              pnWidth = 0;
              pnHeight = 0;
              pnFrameBufferSize = 0;
              EVRTrackedCameraError result = FnTable.GetCameraFrameSize(nDeviceIndex,eFrameType,ref pnWidth,ref pnHeight,ref pnFrameBufferSize);
              return result;
       }
       public EVRTrackedCameraError GetCameraIntrinsics(uint nDeviceIndex,EVRTrackedCameraFrameType eFrameType,ref HmdVector2_t pFocalLength,ref HmdVector2_t pCenter)
       {
              EVRTrackedCameraError result = FnTable.GetCameraIntrinsics(nDeviceIndex,eFrameType,ref pFocalLength,ref pCenter);
              return result;
       }
       public EVRTrackedCameraError GetCameraProjection(uint nDeviceIndex,EVRTrackedCameraFrameType eFrameType,float flZNear,float flZFar,ref HmdMatrix44_t pProjection)
       {
              EVRTrackedCameraError result = FnTable.GetCameraProjection(nDeviceIndex,eFrameType,flZNear,flZFar,ref pProjection);
              return result;
       }
       public EVRTrackedCameraError AcquireVideoStreamingService(uint nDeviceIndex,ref ulong pHandle)
       {
              pHandle = 0;
              EVRTrackedCameraError result = FnTable.AcquireVideoStreamingService(nDeviceIndex,ref pHandle);
              return result;
       }
       public EVRTrackedCameraError ReleaseVideoStreamingService(ulong hTrackedCamera)
       {
              EVRTrackedCameraError result = FnTable.ReleaseVideoStreamingService(hTrackedCamera);
              return result;
       }
       public EVRTrackedCameraError GetVideoStreamFrameBuffer(ulong hTrackedCamera,EVRTrackedCameraFrameType eFrameType,IntPtr pFrameBuffer,uint nFrameBufferSize,ref CameraVideoStreamFrameHeader_t pFrameHeader,uint nFrameHeaderSize)
       {
              EVRTrackedCameraError result = FnTable.GetVideoStreamFrameBuffer(hTrackedCamera,eFrameType,pFrameBuffer,nFrameBufferSize,ref pFrameHeader,nFrameHeaderSize);
              return result;
       }
       public EVRTrackedCameraError GetVideoStreamTextureSize(uint nDeviceIndex,EVRTrackedCameraFrameType eFrameType,ref VRTextureBounds_t pTextureBounds,ref uint pnWidth,ref uint pnHeight)
       {
              pnWidth = 0;
              pnHeight = 0;
              EVRTrackedCameraError result = FnTable.GetVideoStreamTextureSize(nDeviceIndex,eFrameType,ref pTextureBounds,ref pnWidth,ref pnHeight);
              return result;
       }
       public EVRTrackedCameraError GetVideoStreamTextureD3D11(ulong hTrackedCamera,EVRTrackedCameraFrameType eFrameType,IntPtr pD3D11DeviceOrResource,ref IntPtr ppD3D11ShaderResourceView,ref CameraVideoStreamFrameHeader_t pFrameHeader,uint nFrameHeaderSize)
       {
              EVRTrackedCameraError result = FnTable.GetVideoStreamTextureD3D11(hTrackedCamera,eFrameType,pD3D11DeviceOrResource,ref ppD3D11ShaderResourceView,ref pFrameHeader,nFrameHeaderSize);
              return result;
       }
       public EVRTrackedCameraError GetVideoStreamTextureGL(ulong hTrackedCamera,EVRTrackedCameraFrameType eFrameType,ref uint pglTextureId,ref CameraVideoStreamFrameHeader_t pFrameHeader,uint nFrameHeaderSize)
       {
              pglTextureId = 0;
              EVRTrackedCameraError result = FnTable.GetVideoStreamTextureGL(hTrackedCamera,eFrameType,ref pglTextureId,ref pFrameHeader,nFrameHeaderSize);
              return result;
       }
       public EVRTrackedCameraError ReleaseVideoStreamTextureGL(ulong hTrackedCamera,uint glTextureId)
       {
              EVRTrackedCameraError result = FnTable.ReleaseVideoStreamTextureGL(hTrackedCamera,glTextureId);
              return result;
       }
}


public class CVRApplications
{
       IVRApplications FnTable;
       internal CVRApplications(IntPtr pInterface)
       {
              FnTable = (IVRApplications)Marshal.PtrToStructure(pInterface, typeof(IVRApplications));
       }
       public EVRApplicationError AddApplicationManifest(string pchApplicationManifestFullPath,bool bTemporary)
       {
              EVRApplicationError result = FnTable.AddApplicationManifest(pchApplicationManifestFullPath,bTemporary);
              return result;
       }
       public EVRApplicationError RemoveApplicationManifest(string pchApplicationManifestFullPath)
       {
              EVRApplicationError result = FnTable.RemoveApplicationManifest(pchApplicationManifestFullPath);
              return result;
       }
       public bool IsApplicationInstalled(string pchAppKey)
       {
              bool result = FnTable.IsApplicationInstalled(pchAppKey);
              return result;
       }
       public uint GetApplicationCount()
       {
              uint result = FnTable.GetApplicationCount();
              return result;
       }
       public EVRApplicationError GetApplicationKeyByIndex(uint unApplicationIndex,System.Text.StringBuilder pchAppKeyBuffer,uint unAppKeyBufferLen)
       {
              EVRApplicationError result = FnTable.GetApplicationKeyByIndex(unApplicationIndex,pchAppKeyBuffer,unAppKeyBufferLen);
              return result;
       }
       public EVRApplicationError GetApplicationKeyByProcessId(uint unProcessId,string pchAppKeyBuffer,uint unAppKeyBufferLen)
       {
              EVRApplicationError result = FnTable.GetApplicationKeyByProcessId(unProcessId,pchAppKeyBuffer,unAppKeyBufferLen);
              return result;
       }
       public EVRApplicationError LaunchApplication(string pchAppKey)
       {
              EVRApplicationError result = FnTable.LaunchApplication(pchAppKey);
              return result;
       }
       public EVRApplicationError LaunchTemplateApplication(string pchTemplateAppKey,string pchNewAppKey,AppOverrideKeys_t [] pKeys)
       {
              EVRApplicationError result = FnTable.LaunchTemplateApplication(pchTemplateAppKey,pchNewAppKey,pKeys,(uint) pKeys.Length);
              return result;
       }
       public EVRApplicationError LaunchApplicationFromMimeType(string pchMimeType,string pchArgs)
       {
              EVRApplicationError result = FnTable.LaunchApplicationFromMimeType(pchMimeType,pchArgs);
              return result;
       }
       public EVRApplicationError LaunchDashboardOverlay(string pchAppKey)
       {
              EVRApplicationError result = FnTable.LaunchDashboardOverlay(pchAppKey);
              return result;
       }
       public bool CancelApplicationLaunch(string pchAppKey)
       {
              bool result = FnTable.CancelApplicationLaunch(pchAppKey);
              return result;
       }
       public EVRApplicationError IdentifyApplication(uint unProcessId,string pchAppKey)
       {
              EVRApplicationError result = FnTable.IdentifyApplication(unProcessId,pchAppKey);
              return result;
       }
       public uint GetApplicationProcessId(string pchAppKey)
       {
              uint result = FnTable.GetApplicationProcessId(pchAppKey);
              return result;
       }
       public string GetApplicationsErrorNameFromEnum(EVRApplicationError error)
       {
              IntPtr result = FnTable.GetApplicationsErrorNameFromEnum(error);
              return Marshal.PtrToStringAnsi(result);
       }
       public uint GetApplicationPropertyString(string pchAppKey,EVRApplicationProperty eProperty,System.Text.StringBuilder pchPropertyValueBuffer,uint unPropertyValueBufferLen,ref EVRApplicationError peError)
       {
              uint result = FnTable.GetApplicationPropertyString(pchAppKey,eProperty,pchPropertyValueBuffer,unPropertyValueBufferLen,ref peError);
              return result;
       }
       public bool GetApplicationPropertyBool(string pchAppKey,EVRApplicationProperty eProperty,ref EVRApplicationError peError)
       {
              bool result = FnTable.GetApplicationPropertyBool(pchAppKey,eProperty,ref peError);
              return result;
       }
       public ulong GetApplicationPropertyUint64(string pchAppKey,EVRApplicationProperty eProperty,ref EVRApplicationError peError)
       {
              ulong result = FnTable.GetApplicationPropertyUint64(pchAppKey,eProperty,ref peError);
              return result;
       }
       public EVRApplicationError SetApplicationAutoLaunch(string pchAppKey,bool bAutoLaunch)
       {
              EVRApplicationError result = FnTable.SetApplicationAutoLaunch(pchAppKey,bAutoLaunch);
              return result;
       }
       public bool GetApplicationAutoLaunch(string pchAppKey)
       {
              bool result = FnTable.GetApplicationAutoLaunch(pchAppKey);
              return result;
       }
       public EVRApplicationError SetDefaultApplicationForMimeType(string pchAppKey,string pchMimeType)
       {
              EVRApplicationError result = FnTable.SetDefaultApplicationForMimeType(pchAppKey,pchMimeType);
              return result;
       }
       public bool GetDefaultApplicationForMimeType(string pchMimeType,string pchAppKeyBuffer,uint unAppKeyBufferLen)
       {
              bool result = FnTable.GetDefaultApplicationForMimeType(pchMimeType,pchAppKeyBuffer,unAppKeyBufferLen);
              return result;
       }
       public bool GetApplicationSupportedMimeTypes(string pchAppKey,string pchMimeTypesBuffer,uint unMimeTypesBuffer)
       {
              bool result = FnTable.GetApplicationSupportedMimeTypes(pchAppKey,pchMimeTypesBuffer,unMimeTypesBuffer);
              return result;
       }
       public uint GetApplicationsThatSupportMimeType(string pchMimeType,string pchAppKeysThatSupportBuffer,uint unAppKeysThatSupportBuffer)
       {
              uint result = FnTable.GetApplicationsThatSupportMimeType(pchMimeType,pchAppKeysThatSupportBuffer,unAppKeysThatSupportBuffer);
              return result;
       }
       public uint GetApplicationLaunchArguments(uint unHandle,string pchArgs,uint unArgs)
       {
              uint result = FnTable.GetApplicationLaunchArguments(unHandle,pchArgs,unArgs);
              return result;
       }
       public EVRApplicationError GetStartingApplication(string pchAppKeyBuffer,uint unAppKeyBufferLen)
       {
              EVRApplicationError result = FnTable.GetStartingApplication(pchAppKeyBuffer,unAppKeyBufferLen);
              return result;
       }
       public EVRApplicationTransitionState GetTransitionState()
       {
              EVRApplicationTransitionState result = FnTable.GetTransitionState();
              return result;
       }
       public EVRApplicationError PerformApplicationPrelaunchCheck(string pchAppKey)
       {
              EVRApplicationError result = FnTable.PerformApplicationPrelaunchCheck(pchAppKey);
              return result;
       }
       public string GetApplicationsTransitionStateNameFromEnum(EVRApplicationTransitionState state)
       {
              IntPtr result = FnTable.GetApplicationsTransitionStateNameFromEnum(state);
              return Marshal.PtrToStringAnsi(result);
       }
       public bool IsQuitUserPromptRequested()
       {
              bool result = FnTable.IsQuitUserPromptRequested();
              return result;
       }
       public EVRApplicationError LaunchInternalProcess(string pchBinaryPath,string pchArguments,string pchWorkingDirectory)
       {
              EVRApplicationError result = FnTable.LaunchInternalProcess(pchBinaryPath,pchArguments,pchWorkingDirectory);
              return result;
       }
       public uint GetCurrentSceneProcessId()
       {
              uint result = FnTable.GetCurrentSceneProcessId();
              return result;
       }
}


public class CVRChaperone
{
       IVRChaperone FnTable;
       internal CVRChaperone(IntPtr pInterface)
       {
              FnTable = (IVRChaperone)Marshal.PtrToStructure(pInterface, typeof(IVRChaperone));
       }
       public ChaperoneCalibrationState GetCalibrationState()
       {
              ChaperoneCalibrationState result = FnTable.GetCalibrationState();
              return result;
       }
       public bool GetPlayAreaSize(ref float pSizeX,ref float pSizeZ)
       {
              pSizeX = 0;
              pSizeZ = 0;
              bool result = FnTable.GetPlayAreaSize(ref pSizeX,ref pSizeZ);
              return result;
       }
       public bool GetPlayAreaRect(ref HmdQuad_t rect)
       {
              bool result = FnTable.GetPlayAreaRect(ref rect);
              return result;
       }
       public void ReloadInfo()
       {
              FnTable.ReloadInfo();
       }
       public void SetSceneColor(HmdColor_t color)
       {
              FnTable.SetSceneColor(color);
       }
       public void GetBoundsColor(ref HmdColor_t pOutputColorArray,int nNumOutputColors,float flCollisionBoundsFadeDistance,ref HmdColor_t pOutputCameraColor)
       {
              FnTable.GetBoundsColor(ref pOutputColorArray,nNumOutputColors,flCollisionBoundsFadeDistance,ref pOutputCameraColor);
       }
       public bool AreBoundsVisible()
       {
              bool result = FnTable.AreBoundsVisible();
              return result;
       }
       public void ForceBoundsVisible(bool bForce)
       {
              FnTable.ForceBoundsVisible(bForce);
       }
}


public class CVRChaperoneSetup
{
       IVRChaperoneSetup FnTable;
       internal CVRChaperoneSetup(IntPtr pInterface)
       {
              FnTable = (IVRChaperoneSetup)Marshal.PtrToStructure(pInterface, typeof(IVRChaperoneSetup));
       }
       public bool CommitWorkingCopy(EChaperoneConfigFile configFile)
       {
              bool result = FnTable.CommitWorkingCopy(configFile);
              return result;
       }
       public void RevertWorkingCopy()
       {
              FnTable.RevertWorkingCopy();
       }
       public bool GetWorkingPlayAreaSize(ref float pSizeX,ref float pSizeZ)
       {
              pSizeX = 0;
              pSizeZ = 0;
              bool result = FnTable.GetWorkingPlayAreaSize(ref pSizeX,ref pSizeZ);
              return result;
       }
       public bool GetWorkingPlayAreaRect(ref HmdQuad_t rect)
       {
              bool result = FnTable.GetWorkingPlayAreaRect(ref rect);
              return result;
       }
       public bool GetWorkingCollisionBoundsInfo(out HmdQuad_t [] pQuadsBuffer)
       {
              uint punQuadsCount = 0;
              bool result = FnTable.GetWorkingCollisionBoundsInfo(null,ref punQuadsCount);
              pQuadsBuffer= new HmdQuad_t[punQuadsCount];
              result = FnTable.GetWorkingCollisionBoundsInfo(pQuadsBuffer,ref punQuadsCount);
              return result;
       }
       public bool GetLiveCollisionBoundsInfo(out HmdQuad_t [] pQuadsBuffer)
       {
              uint punQuadsCount = 0;
              bool result = FnTable.GetLiveCollisionBoundsInfo(null,ref punQuadsCount);
              pQuadsBuffer= new HmdQuad_t[punQuadsCount];
              result = FnTable.GetLiveCollisionBoundsInfo(pQuadsBuffer,ref punQuadsCount);
              return result;
       }
       public bool GetWorkingSeatedZeroPoseToRawTrackingPose(ref HmdMatrix34_t pmatSeatedZeroPoseToRawTrackingPose)
       {
              bool result = FnTable.GetWorkingSeatedZeroPoseToRawTrackingPose(ref pmatSeatedZeroPoseToRawTrackingPose);
              return result;
       }
       public bool GetWorkingStandingZeroPoseToRawTrackingPose(ref HmdMatrix34_t pmatStandingZeroPoseToRawTrackingPose)
       {
              bool result = FnTable.GetWorkingStandingZeroPoseToRawTrackingPose(ref pmatStandingZeroPoseToRawTrackingPose);
              return result;
       }
       public void SetWorkingPlayAreaSize(float sizeX,float sizeZ)
       {
              FnTable.SetWorkingPlayAreaSize(sizeX,sizeZ);
       }
       public void SetWorkingCollisionBoundsInfo(HmdQuad_t [] pQuadsBuffer)
       {
              FnTable.SetWorkingCollisionBoundsInfo(pQuadsBuffer,(uint) pQuadsBuffer.Length);
       }
       public void SetWorkingSeatedZeroPoseToRawTrackingPose(ref HmdMatrix34_t pMatSeatedZeroPoseToRawTrackingPose)
       {
              FnTable.SetWorkingSeatedZeroPoseToRawTrackingPose(ref pMatSeatedZeroPoseToRawTrackingPose);
       }
       public void SetWorkingStandingZeroPoseToRawTrackingPose(ref HmdMatrix34_t pMatStandingZeroPoseToRawTrackingPose)
       {
              FnTable.SetWorkingStandingZeroPoseToRawTrackingPose(ref pMatStandingZeroPoseToRawTrackingPose);
       }
       public void ReloadFromDisk(EChaperoneConfigFile configFile)
       {
              FnTable.ReloadFromDisk(configFile);
       }
       public bool GetLiveSeatedZeroPoseToRawTrackingPose(ref HmdMatrix34_t pmatSeatedZeroPoseToRawTrackingPose)
       {
              bool result = FnTable.GetLiveSeatedZeroPoseToRawTrackingPose(ref pmatSeatedZeroPoseToRawTrackingPose);
              return result;
       }
       public void SetWorkingCollisionBoundsTagsInfo(byte [] pTagsBuffer)
       {
              FnTable.SetWorkingCollisionBoundsTagsInfo(pTagsBuffer,(uint) pTagsBuffer.Length);
       }
       public bool GetLiveCollisionBoundsTagsInfo(out byte [] pTagsBuffer)
       {
              uint punTagCount = 0;
              bool result = FnTable.GetLiveCollisionBoundsTagsInfo(null,ref punTagCount);
              pTagsBuffer= new byte[punTagCount];
              result = FnTable.GetLiveCollisionBoundsTagsInfo(pTagsBuffer,ref punTagCount);
              return result;
       }
       public bool SetWorkingPhysicalBoundsInfo(HmdQuad_t [] pQuadsBuffer)
       {
              bool result = FnTable.SetWorkingPhysicalBoundsInfo(pQuadsBuffer,(uint) pQuadsBuffer.Length);
              return result;
       }
       public bool GetLivePhysicalBoundsInfo(out HmdQuad_t [] pQuadsBuffer)
       {
              uint punQuadsCount = 0;
              bool result = FnTable.GetLivePhysicalBoundsInfo(null,ref punQuadsCount);
              pQuadsBuffer= new HmdQuad_t[punQuadsCount];
              result = FnTable.GetLivePhysicalBoundsInfo(pQuadsBuffer,ref punQuadsCount);
              return result;
       }
       public bool ExportLiveToBuffer(System.Text.StringBuilder pBuffer,ref uint pnBufferLength)
       {
              pnBufferLength = 0;
              bool result = FnTable.ExportLiveToBuffer(pBuffer,ref pnBufferLength);
              return result;
       }
       public bool ImportFromBufferToWorking(string pBuffer,uint nImportFlags)
       {
              bool result = FnTable.ImportFromBufferToWorking(pBuffer,nImportFlags);
              return result;
       }
}


public class CVRCompositor
{
       IVRCompositor FnTable;
       internal CVRCompositor(IntPtr pInterface)
       {
              FnTable = (IVRCompositor)Marshal.PtrToStructure(pInterface, typeof(IVRCompositor));
       }
       public void SetTrackingSpace(ETrackingUniverseOrigin eOrigin)
       {
              FnTable.SetTrackingSpace(eOrigin);
       }
       public ETrackingUniverseOrigin GetTrackingSpace()
       {
              ETrackingUniverseOrigin result = FnTable.GetTrackingSpace();
              return result;
       }
       public EVRCompositorError WaitGetPoses(TrackedDevicePose_t [] pRenderPoseArray,TrackedDevicePose_t [] pGamePoseArray)
       {
              EVRCompositorError result = FnTable.WaitGetPoses(pRenderPoseArray,(uint) pRenderPoseArray.Length,pGamePoseArray,(uint) pGamePoseArray.Length);
              return result;
       }
       public EVRCompositorError GetLastPoses(TrackedDevicePose_t [] pRenderPoseArray,TrackedDevicePose_t [] pGamePoseArray)
       {
              EVRCompositorError result = FnTable.GetLastPoses(pRenderPoseArray,(uint) pRenderPoseArray.Length,pGamePoseArray,(uint) pGamePoseArray.Length);
              return result;
       }
       public EVRCompositorError GetLastPoseForTrackedDeviceIndex(uint unDeviceIndex,ref TrackedDevicePose_t pOutputPose,ref TrackedDevicePose_t pOutputGamePose)
       {
              EVRCompositorError result = FnTable.GetLastPoseForTrackedDeviceIndex(unDeviceIndex,ref pOutputPose,ref pOutputGamePose);
              return result;
       }
       public EVRCompositorError Submit(EVREye eEye,ref Texture_t pTexture,ref VRTextureBounds_t pBounds,EVRSubmitFlags nSubmitFlags)
       {
              EVRCompositorError result = FnTable.Submit(eEye,ref pTexture,ref pBounds,nSubmitFlags);
              return result;
       }
       public void ClearLastSubmittedFrame()
       {
              FnTable.ClearLastSubmittedFrame();
       }
       public void PostPresentHandoff()
       {
              FnTable.PostPresentHandoff();
       }
       public bool GetFrameTiming(ref Compositor_FrameTiming pTiming,uint unFramesAgo)
       {
              bool result = FnTable.GetFrameTiming(ref pTiming,unFramesAgo);
              return result;
       }
       public uint GetFrameTimings(ref Compositor_FrameTiming pTiming,uint nFrames)
       {
              uint result = FnTable.GetFrameTimings(ref pTiming,nFrames);
              return result;
       }
       public float GetFrameTimeRemaining()
       {
              float result = FnTable.GetFrameTimeRemaining();
              return result;
       }
       public void GetCumulativeStats(ref Compositor_CumulativeStats pStats,uint nStatsSizeInBytes)
       {
              FnTable.GetCumulativeStats(ref pStats,nStatsSizeInBytes);
       }
       public void FadeToColor(float fSeconds,float fRed,float fGreen,float fBlue,float fAlpha,bool bBackground)
       {
              FnTable.FadeToColor(fSeconds,fRed,fGreen,fBlue,fAlpha,bBackground);
       }
       public HmdColor_t GetCurrentFadeColor(bool bBackground)
       {
              HmdColor_t result = FnTable.GetCurrentFadeColor(bBackground);
              return result;
       }
       public void FadeGrid(float fSeconds,bool bFadeIn)
       {
              FnTable.FadeGrid(fSeconds,bFadeIn);
       }
       public float GetCurrentGridAlpha()
       {
              float result = FnTable.GetCurrentGridAlpha();
              return result;
       }
       public EVRCompositorError SetSkyboxOverride(Texture_t [] pTextures)
       {
              EVRCompositorError result = FnTable.SetSkyboxOverride(pTextures,(uint) pTextures.Length);
              return result;
       }
       public void ClearSkyboxOverride()
       {
              FnTable.ClearSkyboxOverride();
       }
       public void CompositorBringToFront()
       {
              FnTable.CompositorBringToFront();
       }
       public void CompositorGoToBack()
       {
              FnTable.CompositorGoToBack();
       }
       public void CompositorQuit()
       {
              FnTable.CompositorQuit();
       }
       public bool IsFullscreen()
       {
              bool result = FnTable.IsFullscreen();
              return result;
       }
       public uint GetCurrentSceneFocusProcess()
       {
              uint result = FnTable.GetCurrentSceneFocusProcess();
              return result;
       }
       public uint GetLastFrameRenderer()
       {
              uint result = FnTable.GetLastFrameRenderer();
              return result;
       }
       public bool CanRenderScene()
       {
              bool result = FnTable.CanRenderScene();
              return result;
       }
       public void ShowMirrorWindow()
       {
              FnTable.ShowMirrorWindow();
       }
       public void HideMirrorWindow()
       {
              FnTable.HideMirrorWindow();
       }
       public bool IsMirrorWindowVisible()
       {
              bool result = FnTable.IsMirrorWindowVisible();
              return result;
       }
       public void CompositorDumpImages()
       {
              FnTable.CompositorDumpImages();
       }
       public bool ShouldAppRenderWithLowResources()
       {
              bool result = FnTable.ShouldAppRenderWithLowResources();
              return result;
       }
       public void ForceInterleavedReprojectionOn(bool bOverride)
       {
              FnTable.ForceInterleavedReprojectionOn(bOverride);
       }
       public void ForceReconnectProcess()
       {
              FnTable.ForceReconnectProcess();
       }
       public void SuspendRendering(bool bSuspend)
       {
              FnTable.SuspendRendering(bSuspend);
       }
       public EVRCompositorError GetMirrorTextureD3D11(EVREye eEye,IntPtr pD3D11DeviceOrResource,ref IntPtr ppD3D11ShaderResourceView)
       {
              EVRCompositorError result = FnTable.GetMirrorTextureD3D11(eEye,pD3D11DeviceOrResource,ref ppD3D11ShaderResourceView);
              return result;
       }
       public void ReleaseMirrorTextureD3D11(IntPtr pD3D11ShaderResourceView)
       {
              FnTable.ReleaseMirrorTextureD3D11(pD3D11ShaderResourceView);
       }
       public EVRCompositorError GetMirrorTextureGL(EVREye eEye,ref uint pglTextureId,IntPtr pglSharedTextureHandle)
       {
              pglTextureId = 0;
              EVRCompositorError result = FnTable.GetMirrorTextureGL(eEye,ref pglTextureId,pglSharedTextureHandle);
              return result;
       }
       public bool ReleaseSharedGLTexture(uint glTextureId,IntPtr glSharedTextureHandle)
       {
              bool result = FnTable.ReleaseSharedGLTexture(glTextureId,glSharedTextureHandle);
              return result;
       }
       public void LockGLSharedTextureForAccess(IntPtr glSharedTextureHandle)
       {
              FnTable.LockGLSharedTextureForAccess(glSharedTextureHandle);
       }
       public void UnlockGLSharedTextureForAccess(IntPtr glSharedTextureHandle)
       {
              FnTable.UnlockGLSharedTextureForAccess(glSharedTextureHandle);
       }
       public uint GetVulkanInstanceExtensionsRequired(System.Text.StringBuilder pchValue,uint unBufferSize)
       {
              uint result = FnTable.GetVulkanInstanceExtensionsRequired(pchValue,unBufferSize);
              return result;
       }
       public uint GetVulkanDeviceExtensionsRequired(IntPtr pPhysicalDevice,System.Text.StringBuilder pchValue,uint unBufferSize)
       {
              uint result = FnTable.GetVulkanDeviceExtensionsRequired(pPhysicalDevice,pchValue,unBufferSize);
              return result;
       }
}


public class CVROverlay
{
       IVROverlay FnTable;
       internal CVROverlay(IntPtr pInterface)
       {
              FnTable = (IVROverlay)Marshal.PtrToStructure(pInterface, typeof(IVROverlay));
       }
       public EVROverlayError FindOverlay(string pchOverlayKey,ref ulong pOverlayHandle)
       {
              pOverlayHandle = 0;
              EVROverlayError result = FnTable.FindOverlay(pchOverlayKey,ref pOverlayHandle);
              return result;
       }
       public EVROverlayError CreateOverlay(string pchOverlayKey,string pchOverlayFriendlyName,ref ulong pOverlayHandle)
       {
              pOverlayHandle = 0;
              EVROverlayError result = FnTable.CreateOverlay(pchOverlayKey,pchOverlayFriendlyName,ref pOverlayHandle);
              return result;
       }
       public EVROverlayError DestroyOverlay(ulong ulOverlayHandle)
       {
              EVROverlayError result = FnTable.DestroyOverlay(ulOverlayHandle);
              return result;
       }
       public EVROverlayError SetHighQualityOverlay(ulong ulOverlayHandle)
       {
              EVROverlayError result = FnTable.SetHighQualityOverlay(ulOverlayHandle);
              return result;
       }
       public ulong GetHighQualityOverlay()
       {
              ulong result = FnTable.GetHighQualityOverlay();
              return result;
       }
       public uint GetOverlayKey(ulong ulOverlayHandle,System.Text.StringBuilder pchValue,uint unBufferSize,ref EVROverlayError pError)
       {
              uint result = FnTable.GetOverlayKey(ulOverlayHandle,pchValue,unBufferSize,ref pError);
              return result;
       }
       public uint GetOverlayName(ulong ulOverlayHandle,System.Text.StringBuilder pchValue,uint unBufferSize,ref EVROverlayError pError)
       {
              uint result = FnTable.GetOverlayName(ulOverlayHandle,pchValue,unBufferSize,ref pError);
              return result;
       }
       public EVROverlayError GetOverlayImageData(ulong ulOverlayHandle,IntPtr pvBuffer,uint unBufferSize,ref uint punWidth,ref uint punHeight)
       {
              punWidth = 0;
              punHeight = 0;
              EVROverlayError result = FnTable.GetOverlayImageData(ulOverlayHandle,pvBuffer,unBufferSize,ref punWidth,ref punHeight);
              return result;
       }
       public string GetOverlayErrorNameFromEnum(EVROverlayError error)
       {
              IntPtr result = FnTable.GetOverlayErrorNameFromEnum(error);
              return Marshal.PtrToStringAnsi(result);
       }
       public EVROverlayError SetOverlayRenderingPid(ulong ulOverlayHandle,uint unPID)
       {
              EVROverlayError result = FnTable.SetOverlayRenderingPid(ulOverlayHandle,unPID);
              return result;
       }
       public uint GetOverlayRenderingPid(ulong ulOverlayHandle)
       {
              uint result = FnTable.GetOverlayRenderingPid(ulOverlayHandle);
              return result;
       }
       public EVROverlayError SetOverlayFlag(ulong ulOverlayHandle,VROverlayFlags eOverlayFlag,bool bEnabled)
       {
              EVROverlayError result = FnTable.SetOverlayFlag(ulOverlayHandle,eOverlayFlag,bEnabled);
              return result;
       }
       public EVROverlayError GetOverlayFlag(ulong ulOverlayHandle,VROverlayFlags eOverlayFlag,ref bool pbEnabled)
       {
              pbEnabled = false;
              EVROverlayError result = FnTable.GetOverlayFlag(ulOverlayHandle,eOverlayFlag,ref pbEnabled);
              return result;
       }
       public EVROverlayError SetOverlayColor(ulong ulOverlayHandle,float fRed,float fGreen,float fBlue)
       {
              EVROverlayError result = FnTable.SetOverlayColor(ulOverlayHandle,fRed,fGreen,fBlue);
              return result;
       }
       public EVROverlayError GetOverlayColor(ulong ulOverlayHandle,ref float pfRed,ref float pfGreen,ref float pfBlue)
       {
              pfRed = 0;
              pfGreen = 0;
              pfBlue = 0;
              EVROverlayError result = FnTable.GetOverlayColor(ulOverlayHandle,ref pfRed,ref pfGreen,ref pfBlue);
              return result;
       }
       public EVROverlayError SetOverlayAlpha(ulong ulOverlayHandle,float fAlpha)
       {
              EVROverlayError result = FnTable.SetOverlayAlpha(ulOverlayHandle,fAlpha);
              return result;
       }
       public EVROverlayError GetOverlayAlpha(ulong ulOverlayHandle,ref float pfAlpha)
       {
              pfAlpha = 0;
              EVROverlayError result = FnTable.GetOverlayAlpha(ulOverlayHandle,ref pfAlpha);
              return result;
       }
       public EVROverlayError SetOverlayTexelAspect(ulong ulOverlayHandle,float fTexelAspect)
       {
              EVROverlayError result = FnTable.SetOverlayTexelAspect(ulOverlayHandle,fTexelAspect);
              return result;
       }
       public EVROverlayError GetOverlayTexelAspect(ulong ulOverlayHandle,ref float pfTexelAspect)
       {
              pfTexelAspect = 0;
              EVROverlayError result = FnTable.GetOverlayTexelAspect(ulOverlayHandle,ref pfTexelAspect);
              return result;
       }
       public EVROverlayError SetOverlaySortOrder(ulong ulOverlayHandle,uint unSortOrder)
       {
              EVROverlayError result = FnTable.SetOverlaySortOrder(ulOverlayHandle,unSortOrder);
              return result;
       }
       public EVROverlayError GetOverlaySortOrder(ulong ulOverlayHandle,ref uint punSortOrder)
       {
              punSortOrder = 0;
              EVROverlayError result = FnTable.GetOverlaySortOrder(ulOverlayHandle,ref punSortOrder);
              return result;
       }
       public EVROverlayError SetOverlayWidthInMeters(ulong ulOverlayHandle,float fWidthInMeters)
       {
              EVROverlayError result = FnTable.SetOverlayWidthInMeters(ulOverlayHandle,fWidthInMeters);
              return result;
       }
       public EVROverlayError GetOverlayWidthInMeters(ulong ulOverlayHandle,ref float pfWidthInMeters)
       {
              pfWidthInMeters = 0;
              EVROverlayError result = FnTable.GetOverlayWidthInMeters(ulOverlayHandle,ref pfWidthInMeters);
              return result;
       }
       public EVROverlayError SetOverlayAutoCurveDistanceRangeInMeters(ulong ulOverlayHandle,float fMinDistanceInMeters,float fMaxDistanceInMeters)
       {
              EVROverlayError result = FnTable.SetOverlayAutoCurveDistanceRangeInMeters(ulOverlayHandle,fMinDistanceInMeters,fMaxDistanceInMeters);
              return result;
       }
       public EVROverlayError GetOverlayAutoCurveDistanceRangeInMeters(ulong ulOverlayHandle,ref float pfMinDistanceInMeters,ref float pfMaxDistanceInMeters)
       {
              pfMinDistanceInMeters = 0;
              pfMaxDistanceInMeters = 0;
              EVROverlayError result = FnTable.GetOverlayAutoCurveDistanceRangeInMeters(ulOverlayHandle,ref pfMinDistanceInMeters,ref pfMaxDistanceInMeters);
              return result;
       }
       public EVROverlayError SetOverlayTextureColorSpace(ulong ulOverlayHandle,EColorSpace eTextureColorSpace)
       {
              EVROverlayError result = FnTable.SetOverlayTextureColorSpace(ulOverlayHandle,eTextureColorSpace);
              return result;
       }
       public EVROverlayError GetOverlayTextureColorSpace(ulong ulOverlayHandle,ref EColorSpace peTextureColorSpace)
       {
              EVROverlayError result = FnTable.GetOverlayTextureColorSpace(ulOverlayHandle,ref peTextureColorSpace);
              return result;
       }
       public EVROverlayError SetOverlayTextureBounds(ulong ulOverlayHandle,ref VRTextureBounds_t pOverlayTextureBounds)
       {
              EVROverlayError result = FnTable.SetOverlayTextureBounds(ulOverlayHandle,ref pOverlayTextureBounds);
              return result;
       }
       public EVROverlayError GetOverlayTextureBounds(ulong ulOverlayHandle,ref VRTextureBounds_t pOverlayTextureBounds)
       {
              EVROverlayError result = FnTable.GetOverlayTextureBounds(ulOverlayHandle,ref pOverlayTextureBounds);
              return result;
       }
       public EVROverlayError GetOverlayTransformType(ulong ulOverlayHandle,ref VROverlayTransformType peTransformType)
       {
              EVROverlayError result = FnTable.GetOverlayTransformType(ulOverlayHandle,ref peTransformType);
              return result;
       }
       public EVROverlayError SetOverlayTransformAbsolute(ulong ulOverlayHandle,ETrackingUniverseOrigin eTrackingOrigin,ref HmdMatrix34_t pmatTrackingOriginToOverlayTransform)
       {
              EVROverlayError result = FnTable.SetOverlayTransformAbsolute(ulOverlayHandle,eTrackingOrigin,ref pmatTrackingOriginToOverlayTransform);
              return result;
       }
       public EVROverlayError GetOverlayTransformAbsolute(ulong ulOverlayHandle,ref ETrackingUniverseOrigin peTrackingOrigin,ref HmdMatrix34_t pmatTrackingOriginToOverlayTransform)
       {
              EVROverlayError result = FnTable.GetOverlayTransformAbsolute(ulOverlayHandle,ref peTrackingOrigin,ref pmatTrackingOriginToOverlayTransform);
              return result;
       }
       public EVROverlayError SetOverlayTransformTrackedDeviceRelative(ulong ulOverlayHandle,uint unTrackedDevice,ref HmdMatrix34_t pmatTrackedDeviceToOverlayTransform)
       {
              EVROverlayError result = FnTable.SetOverlayTransformTrackedDeviceRelative(ulOverlayHandle,unTrackedDevice,ref pmatTrackedDeviceToOverlayTransform);
              return result;
       }
       public EVROverlayError GetOverlayTransformTrackedDeviceRelative(ulong ulOverlayHandle,ref uint punTrackedDevice,ref HmdMatrix34_t pmatTrackedDeviceToOverlayTransform)
       {
              punTrackedDevice = 0;
              EVROverlayError result = FnTable.GetOverlayTransformTrackedDeviceRelative(ulOverlayHandle,ref punTrackedDevice,ref pmatTrackedDeviceToOverlayTransform);
              return result;
       }
       public EVROverlayError SetOverlayTransformTrackedDeviceComponent(ulong ulOverlayHandle,uint unDeviceIndex,string pchComponentName)
       {
              EVROverlayError result = FnTable.SetOverlayTransformTrackedDeviceComponent(ulOverlayHandle,unDeviceIndex,pchComponentName);
              return result;
       }
       public EVROverlayError GetOverlayTransformTrackedDeviceComponent(ulong ulOverlayHandle,ref uint punDeviceIndex,string pchComponentName,uint unComponentNameSize)
       {
              punDeviceIndex = 0;
              EVROverlayError result = FnTable.GetOverlayTransformTrackedDeviceComponent(ulOverlayHandle,ref punDeviceIndex,pchComponentName,unComponentNameSize);
              return result;
       }
       public EVROverlayError ShowOverlay(ulong ulOverlayHandle)
       {
              EVROverlayError result = FnTable.ShowOverlay(ulOverlayHandle);
              return result;
       }
       public EVROverlayError HideOverlay(ulong ulOverlayHandle)
       {
              EVROverlayError result = FnTable.HideOverlay(ulOverlayHandle);
              return result;
       }
       public bool IsOverlayVisible(ulong ulOverlayHandle)
       {
              bool result = FnTable.IsOverlayVisible(ulOverlayHandle);
              return result;
       }
       public EVROverlayError GetTransformForOverlayCoordinates(ulong ulOverlayHandle,ETrackingUniverseOrigin eTrackingOrigin,HmdVector2_t coordinatesInOverlay,ref HmdMatrix34_t pmatTransform)
       {
              EVROverlayError result = FnTable.GetTransformForOverlayCoordinates(ulOverlayHandle,eTrackingOrigin,coordinatesInOverlay,ref pmatTransform);
              return result;
       }
       public bool PollNextOverlayEvent(ulong ulOverlayHandle,ref VREvent_t pEvent,uint uncbVREvent)
       {
              bool result = FnTable.PollNextOverlayEvent(ulOverlayHandle,ref pEvent,uncbVREvent);
              return result;
       }
       public EVROverlayError GetOverlayInputMethod(ulong ulOverlayHandle,ref VROverlayInputMethod peInputMethod)
       {
              EVROverlayError result = FnTable.GetOverlayInputMethod(ulOverlayHandle,ref peInputMethod);
              return result;
       }
       public EVROverlayError SetOverlayInputMethod(ulong ulOverlayHandle,VROverlayInputMethod eInputMethod)
       {
              EVROverlayError result = FnTable.SetOverlayInputMethod(ulOverlayHandle,eInputMethod);
              return result;
       }
       public EVROverlayError GetOverlayMouseScale(ulong ulOverlayHandle,ref HmdVector2_t pvecMouseScale)
       {
              EVROverlayError result = FnTable.GetOverlayMouseScale(ulOverlayHandle,ref pvecMouseScale);
              return result;
       }
       public EVROverlayError SetOverlayMouseScale(ulong ulOverlayHandle,ref HmdVector2_t pvecMouseScale)
       {
              EVROverlayError result = FnTable.SetOverlayMouseScale(ulOverlayHandle,ref pvecMouseScale);
              return result;
       }
       public bool ComputeOverlayIntersection(ulong ulOverlayHandle,ref VROverlayIntersectionParams_t pParams,ref VROverlayIntersectionResults_t pResults)
       {
              bool result = FnTable.ComputeOverlayIntersection(ulOverlayHandle,ref pParams,ref pResults);
              return result;
       }
       public bool HandleControllerOverlayInteractionAsMouse(ulong ulOverlayHandle,uint unControllerDeviceIndex)
       {
              bool result = FnTable.HandleControllerOverlayInteractionAsMouse(ulOverlayHandle,unControllerDeviceIndex);
              return result;
       }
       public bool IsHoverTargetOverlay(ulong ulOverlayHandle)
       {
              bool result = FnTable.IsHoverTargetOverlay(ulOverlayHandle);
              return result;
       }
       public ulong GetGamepadFocusOverlay()
       {
              ulong result = FnTable.GetGamepadFocusOverlay();
              return result;
       }
       public EVROverlayError SetGamepadFocusOverlay(ulong ulNewFocusOverlay)
       {
              EVROverlayError result = FnTable.SetGamepadFocusOverlay(ulNewFocusOverlay);
              return result;
       }
       public EVROverlayError SetOverlayNeighbor(EOverlayDirection eDirection,ulong ulFrom,ulong ulTo)
       {
              EVROverlayError result = FnTable.SetOverlayNeighbor(eDirection,ulFrom,ulTo);
              return result;
       }
       public EVROverlayError MoveGamepadFocusToNeighbor(EOverlayDirection eDirection,ulong ulFrom)
       {
              EVROverlayError result = FnTable.MoveGamepadFocusToNeighbor(eDirection,ulFrom);
              return result;
       }
       public EVROverlayError SetOverlayTexture(ulong ulOverlayHandle,ref Texture_t pTexture)
       {
              EVROverlayError result = FnTable.SetOverlayTexture(ulOverlayHandle,ref pTexture);
              return result;
       }
       public EVROverlayError ClearOverlayTexture(ulong ulOverlayHandle)
       {
              EVROverlayError result = FnTable.ClearOverlayTexture(ulOverlayHandle);
              return result;
       }
       public EVROverlayError SetOverlayRaw(ulong ulOverlayHandle,IntPtr pvBuffer,uint unWidth,uint unHeight,uint unDepth)
       {
              EVROverlayError result = FnTable.SetOverlayRaw(ulOverlayHandle,pvBuffer,unWidth,unHeight,unDepth);
              return result;
       }
       public EVROverlayError SetOverlayFromFile(ulong ulOverlayHandle,string pchFilePath)
       {
              EVROverlayError result = FnTable.SetOverlayFromFile(ulOverlayHandle,pchFilePath);
              return result;
       }
       public EVROverlayError GetOverlayTexture(ulong ulOverlayHandle,ref IntPtr pNativeTextureHandle,IntPtr pNativeTextureRef,ref uint pWidth,ref uint pHeight,ref uint pNativeFormat,ref ETextureType pAPIType,ref EColorSpace pColorSpace,ref VRTextureBounds_t pTextureBounds)
       {
              pWidth = 0;
              pHeight = 0;
              pNativeFormat = 0;
              EVROverlayError result = FnTable.GetOverlayTexture(ulOverlayHandle,ref pNativeTextureHandle,pNativeTextureRef,ref pWidth,ref pHeight,ref pNativeFormat,ref pAPIType,ref pColorSpace,ref pTextureBounds);
              return result;
       }
       public EVROverlayError ReleaseNativeOverlayHandle(ulong ulOverlayHandle,IntPtr pNativeTextureHandle)
       {
              EVROverlayError result = FnTable.ReleaseNativeOverlayHandle(ulOverlayHandle,pNativeTextureHandle);
              return result;
       }
       public EVROverlayError GetOverlayTextureSize(ulong ulOverlayHandle,ref uint pWidth,ref uint pHeight)
       {
              pWidth = 0;
              pHeight = 0;
              EVROverlayError result = FnTable.GetOverlayTextureSize(ulOverlayHandle,ref pWidth,ref pHeight);
              return result;
       }
       public EVROverlayError CreateDashboardOverlay(string pchOverlayKey,string pchOverlayFriendlyName,ref ulong pMainHandle,ref ulong pThumbnailHandle)
       {
              pMainHandle = 0;
              pThumbnailHandle = 0;
              EVROverlayError result = FnTable.CreateDashboardOverlay(pchOverlayKey,pchOverlayFriendlyName,ref pMainHandle,ref pThumbnailHandle);
              return result;
       }
       public bool IsDashboardVisible()
       {
              bool result = FnTable.IsDashboardVisible();
              return result;
       }
       public bool IsActiveDashboardOverlay(ulong ulOverlayHandle)
       {
              bool result = FnTable.IsActiveDashboardOverlay(ulOverlayHandle);
              return result;
       }
       public EVROverlayError SetDashboardOverlaySceneProcess(ulong ulOverlayHandle,uint unProcessId)
       {
              EVROverlayError result = FnTable.SetDashboardOverlaySceneProcess(ulOverlayHandle,unProcessId);
              return result;
       }
       public EVROverlayError GetDashboardOverlaySceneProcess(ulong ulOverlayHandle,ref uint punProcessId)
       {
              punProcessId = 0;
              EVROverlayError result = FnTable.GetDashboardOverlaySceneProcess(ulOverlayHandle,ref punProcessId);
              return result;
       }
       public void ShowDashboard(string pchOverlayToShow)
       {
              FnTable.ShowDashboard(pchOverlayToShow);
       }
       public uint GetPrimaryDashboardDevice()
       {
              uint result = FnTable.GetPrimaryDashboardDevice();
              return result;
       }
       public EVROverlayError ShowKeyboard(int eInputMode,int eLineInputMode,string pchDescription,uint unCharMax,string pchExistingText,bool bUseMinimalMode,ulong uUserValue)
       {
              EVROverlayError result = FnTable.ShowKeyboard(eInputMode,eLineInputMode,pchDescription,unCharMax,pchExistingText,bUseMinimalMode,uUserValue);
              return result;
       }
       public EVROverlayError ShowKeyboardForOverlay(ulong ulOverlayHandle,int eInputMode,int eLineInputMode,string pchDescription,uint unCharMax,string pchExistingText,bool bUseMinimalMode,ulong uUserValue)
       {
              EVROverlayError result = FnTable.ShowKeyboardForOverlay(ulOverlayHandle,eInputMode,eLineInputMode,pchDescription,unCharMax,pchExistingText,bUseMinimalMode,uUserValue);
              return result;
       }
       public uint GetKeyboardText(System.Text.StringBuilder pchText,uint cchText)
       {
              uint result = FnTable.GetKeyboardText(pchText,cchText);
              return result;
       }
       public void HideKeyboard()
       {
              FnTable.HideKeyboard();
       }
       public void SetKeyboardTransformAbsolute(ETrackingUniverseOrigin eTrackingOrigin,ref HmdMatrix34_t pmatTrackingOriginToKeyboardTransform)
       {
              FnTable.SetKeyboardTransformAbsolute(eTrackingOrigin,ref pmatTrackingOriginToKeyboardTransform);
       }
       public void SetKeyboardPositionForOverlay(ulong ulOverlayHandle,HmdRect2_t avoidRect)
       {
              FnTable.SetKeyboardPositionForOverlay(ulOverlayHandle,avoidRect);
       }
       public EVROverlayError SetOverlayIntersectionMask(ulong ulOverlayHandle,ref VROverlayIntersectionMaskPrimitive_t pMaskPrimitives,uint unNumMaskPrimitives,uint unPrimitiveSize)
       {
              EVROverlayError result = FnTable.SetOverlayIntersectionMask(ulOverlayHandle,ref pMaskPrimitives,unNumMaskPrimitives,unPrimitiveSize);
              return result;
       }
       public EVROverlayError GetOverlayFlags(ulong ulOverlayHandle,ref uint pFlags)
       {
              pFlags = 0;
              EVROverlayError result = FnTable.GetOverlayFlags(ulOverlayHandle,ref pFlags);
              return result;
       }
       public VRMessageOverlayResponse ShowMessageOverlay(string pchText,string pchCaption,string pchButton0Text,string pchButton1Text,string pchButton2Text,string pchButton3Text)
       {
              VRMessageOverlayResponse result = FnTable.ShowMessageOverlay(pchText,pchCaption,pchButton0Text,pchButton1Text,pchButton2Text,pchButton3Text);
              return result;
       }
}


public class CVRRenderModels
{
       IVRRenderModels FnTable;
       internal CVRRenderModels(IntPtr pInterface)
       {
              FnTable = (IVRRenderModels)Marshal.PtrToStructure(pInterface, typeof(IVRRenderModels));
       }
       public EVRRenderModelError LoadRenderModel_Async(string pchRenderModelName,ref IntPtr ppRenderModel)
       {
              EVRRenderModelError result = FnTable.LoadRenderModel_Async(pchRenderModelName,ref ppRenderModel);
              return result;
       }
       public void FreeRenderModel(IntPtr pRenderModel)
       {
              FnTable.FreeRenderModel(pRenderModel);
       }
       public EVRRenderModelError LoadTexture_Async(int textureId,ref IntPtr ppTexture)
       {
              EVRRenderModelError result = FnTable.LoadTexture_Async(textureId,ref ppTexture);
              return result;
       }
       public void FreeTexture(IntPtr pTexture)
       {
              FnTable.FreeTexture(pTexture);
       }
       public EVRRenderModelError LoadTextureD3D11_Async(int textureId,IntPtr pD3D11Device,ref IntPtr ppD3D11Texture2D)
       {
              EVRRenderModelError result = FnTable.LoadTextureD3D11_Async(textureId,pD3D11Device,ref ppD3D11Texture2D);
              return result;
       }
       public EVRRenderModelError LoadIntoTextureD3D11_Async(int textureId,IntPtr pDstTexture)
       {
              EVRRenderModelError result = FnTable.LoadIntoTextureD3D11_Async(textureId,pDstTexture);
              return result;
       }
       public void FreeTextureD3D11(IntPtr pD3D11Texture2D)
       {
              FnTable.FreeTextureD3D11(pD3D11Texture2D);
       }
       public uint GetRenderModelName(uint unRenderModelIndex,System.Text.StringBuilder pchRenderModelName,uint unRenderModelNameLen)
       {
              uint result = FnTable.GetRenderModelName(unRenderModelIndex,pchRenderModelName,unRenderModelNameLen);
              return result;
       }
       public uint GetRenderModelCount()
       {
              uint result = FnTable.GetRenderModelCount();
              return result;
       }
       public uint GetComponentCount(string pchRenderModelName)
       {
              uint result = FnTable.GetComponentCount(pchRenderModelName);
              return result;
       }
       public uint GetComponentName(string pchRenderModelName,uint unComponentIndex,System.Text.StringBuilder pchComponentName,uint unComponentNameLen)
       {
              uint result = FnTable.GetComponentName(pchRenderModelName,unComponentIndex,pchComponentName,unComponentNameLen);
              return result;
       }
       public ulong GetComponentButtonMask(string pchRenderModelName,string pchComponentName)
       {
              ulong result = FnTable.GetComponentButtonMask(pchRenderModelName,pchComponentName);
              return result;
       }
       public uint GetComponentRenderModelName(string pchRenderModelName,string pchComponentName,System.Text.StringBuilder pchComponentRenderModelName,uint unComponentRenderModelNameLen)
       {
              uint result = FnTable.GetComponentRenderModelName(pchRenderModelName,pchComponentName,pchComponentRenderModelName,unComponentRenderModelNameLen);
              return result;
       }
// This is a terrible hack to workaround the fact that VRControllerState_t was
// originally mis-compiled with the wrong packing for Linux and OSX.
       [UnmanagedFunctionPointer(CallingConvention.StdCall)]
       internal delegate bool _GetComponentStatePacked(string pchRenderModelName,string pchComponentName,ref VRControllerState_t_Packed pControllerState,ref RenderModel_ControllerMode_State_t pState,ref RenderModel_ComponentState_t pComponentState);
       [StructLayout(LayoutKind.Explicit)]
       struct GetComponentStateUnion
       {
              [FieldOffset(0)]
              public IVRRenderModels._GetComponentState pGetComponentState;
              [FieldOffset(0)]
              public _GetComponentStatePacked pGetComponentStatePacked;
       }
       public bool GetComponentState(string pchRenderModelName,string pchComponentName,ref VRControllerState_t pControllerState,ref RenderModel_ControllerMode_State_t pState,ref RenderModel_ComponentState_t pComponentState)
       {
              if ((System.Environment.OSVersion.Platform == System.PlatformID.MacOSX) ||
                            (System.Environment.OSVersion.Platform == System.PlatformID.Unix))
              {
                     GetComponentStateUnion u;
                     VRControllerState_t_Packed state_packed = new VRControllerState_t_Packed();
                     u.pGetComponentStatePacked = null;
                     u.pGetComponentState = FnTable.GetComponentState;
                     bool packed_result = u.pGetComponentStatePacked(pchRenderModelName,pchComponentName,ref state_packed,ref pState,ref pComponentState);

                     state_packed.Unpack(ref pControllerState);
                     return packed_result;
              }
              bool result = FnTable.GetComponentState(pchRenderModelName,pchComponentName,ref pControllerState,ref pState,ref pComponentState);
              return result;
       }
       public bool RenderModelHasComponent(string pchRenderModelName,string pchComponentName)
       {
              bool result = FnTable.RenderModelHasComponent(pchRenderModelName,pchComponentName);
              return result;
       }
       public uint GetRenderModelThumbnailURL(string pchRenderModelName,System.Text.StringBuilder pchThumbnailURL,uint unThumbnailURLLen,ref EVRRenderModelError peError)
       {
              uint result = FnTable.GetRenderModelThumbnailURL(pchRenderModelName,pchThumbnailURL,unThumbnailURLLen,ref peError);
              return result;
       }
       public uint GetRenderModelOriginalPath(string pchRenderModelName,System.Text.StringBuilder pchOriginalPath,uint unOriginalPathLen,ref EVRRenderModelError peError)
       {
              uint result = FnTable.GetRenderModelOriginalPath(pchRenderModelName,pchOriginalPath,unOriginalPathLen,ref peError);
              return result;
       }
       public string GetRenderModelErrorNameFromEnum(EVRRenderModelError error)
       {
              IntPtr result = FnTable.GetRenderModelErrorNameFromEnum(error);
              return Marshal.PtrToStringAnsi(result);
       }
}


public class CVRNotifications
{
       IVRNotifications FnTable;
       internal CVRNotifications(IntPtr pInterface)
       {
              FnTable = (IVRNotifications)Marshal.PtrToStructure(pInterface, typeof(IVRNotifications));
       }
       public EVRNotificationError CreateNotification(ulong ulOverlayHandle,ulong ulUserValue,EVRNotificationType type,string pchText,EVRNotificationStyle style,ref NotificationBitmap_t pImage,ref uint pNotificationId)
       {
              pNotificationId = 0;
              EVRNotificationError result = FnTable.CreateNotification(ulOverlayHandle,ulUserValue,type,pchText,style,ref pImage,ref pNotificationId);
              return result;
       }
       public EVRNotificationError RemoveNotification(uint notificationId)
       {
              EVRNotificationError result = FnTable.RemoveNotification(notificationId);
              return result;
       }
}


public class CVRSettings
{
       IVRSettings FnTable;
       internal CVRSettings(IntPtr pInterface)
       {
              FnTable = (IVRSettings)Marshal.PtrToStructure(pInterface, typeof(IVRSettings));
       }
       public string GetSettingsErrorNameFromEnum(EVRSettingsError eError)
       {
              IntPtr result = FnTable.GetSettingsErrorNameFromEnum(eError);
              return Marshal.PtrToStringAnsi(result);
       }
       public bool Sync(bool bForce,ref EVRSettingsError peError)
       {
              bool result = FnTable.Sync(bForce,ref peError);
              return result;
       }
       public void SetBool(string pchSection,string pchSettingsKey,bool bValue,ref EVRSettingsError peError)
       {
              FnTable.SetBool(pchSection,pchSettingsKey,bValue,ref peError);
       }
       public void SetInt32(string pchSection,string pchSettingsKey,int nValue,ref EVRSettingsError peError)
       {
              FnTable.SetInt32(pchSection,pchSettingsKey,nValue,ref peError);
       }
       public void SetFloat(string pchSection,string pchSettingsKey,float flValue,ref EVRSettingsError peError)
       {
              FnTable.SetFloat(pchSection,pchSettingsKey,flValue,ref peError);
       }
       public void SetString(string pchSection,string pchSettingsKey,string pchValue,ref EVRSettingsError peError)
       {
              FnTable.SetString(pchSection,pchSettingsKey,pchValue,ref peError);
       }
       public bool GetBool(string pchSection,string pchSettingsKey,ref EVRSettingsError peError)
       {
              bool result = FnTable.GetBool(pchSection,pchSettingsKey,ref peError);
              return result;
       }
       public int GetInt32(string pchSection,string pchSettingsKey,ref EVRSettingsError peError)
       {
              int result = FnTable.GetInt32(pchSection,pchSettingsKey,ref peError);
              return result;
       }
       public float GetFloat(string pchSection,string pchSettingsKey,ref EVRSettingsError peError)
       {
              float result = FnTable.GetFloat(pchSection,pchSettingsKey,ref peError);
              return result;
       }
       public void GetString(string pchSection,string pchSettingsKey,System.Text.StringBuilder pchValue,uint unValueLen,ref EVRSettingsError peError)
       {
              FnTable.GetString(pchSection,pchSettingsKey,pchValue,unValueLen,ref peError);
       }
       public void RemoveSection(string pchSection,ref EVRSettingsError peError)
       {
              FnTable.RemoveSection(pchSection,ref peError);
       }
       public void RemoveKeyInSection(string pchSection,string pchSettingsKey,ref EVRSettingsError peError)
       {
              FnTable.RemoveKeyInSection(pchSection,pchSettingsKey,ref peError);
       }
}


public class CVRScreenshots
{
       IVRScreenshots FnTable;
       internal CVRScreenshots(IntPtr pInterface)
       {
              FnTable = (IVRScreenshots)Marshal.PtrToStructure(pInterface, typeof(IVRScreenshots));
       }
       public EVRScreenshotError RequestScreenshot(ref uint pOutScreenshotHandle,EVRScreenshotType type,string pchPreviewFilename,string pchVRFilename)
       {
              pOutScreenshotHandle = 0;
              EVRScreenshotError result = FnTable.RequestScreenshot(ref pOutScreenshotHandle,type,pchPreviewFilename,pchVRFilename);
              return result;
       }
       public EVRScreenshotError HookScreenshot(EVRScreenshotType [] pSupportedTypes)
       {
              EVRScreenshotError result = FnTable.HookScreenshot(pSupportedTypes,(int) pSupportedTypes.Length);
              return result;
       }
       public EVRScreenshotType GetScreenshotPropertyType(uint screenshotHandle,ref EVRScreenshotError pError)
       {
              EVRScreenshotType result = FnTable.GetScreenshotPropertyType(screenshotHandle,ref pError);
              return result;
       }
       public uint GetScreenshotPropertyFilename(uint screenshotHandle,EVRScreenshotPropertyFilenames filenameType,System.Text.StringBuilder pchFilename,uint cchFilename,ref EVRScreenshotError pError)
       {
              uint result = FnTable.GetScreenshotPropertyFilename(screenshotHandle,filenameType,pchFilename,cchFilename,ref pError);
              return result;
       }
       public EVRScreenshotError UpdateScreenshotProgress(uint screenshotHandle,float flProgress)
       {
              EVRScreenshotError result = FnTable.UpdateScreenshotProgress(screenshotHandle,flProgress);
              return result;
       }
       public EVRScreenshotError TakeStereoScreenshot(ref uint pOutScreenshotHandle,string pchPreviewFilename,string pchVRFilename)
       {
              pOutScreenshotHandle = 0;
              EVRScreenshotError result = FnTable.TakeStereoScreenshot(ref pOutScreenshotHandle,pchPreviewFilename,pchVRFilename);
              return result;
       }
       public EVRScreenshotError SubmitScreenshot(uint screenshotHandle,EVRScreenshotType type,string pchSourcePreviewFilename,string pchSourceVRFilename)
       {
              EVRScreenshotError result = FnTable.SubmitScreenshot(screenshotHandle,type,pchSourcePreviewFilename,pchSourceVRFilename);
              return result;
       }
}


public class CVRResources
{
       IVRResources FnTable;
       internal CVRResources(IntPtr pInterface)
       {
              FnTable = (IVRResources)Marshal.PtrToStructure(pInterface, typeof(IVRResources));
       }
       public uint LoadSharedResource(string pchResourceName,string pchBuffer,uint unBufferLen)
       {
              uint result = FnTable.LoadSharedResource(pchResourceName,pchBuffer,unBufferLen);
              return result;
       }
       public uint GetResourceFullPath(string pchResourceName,string pchResourceTypeDirectory,string pchPathBuffer,uint unBufferLen)
       {
              uint result = FnTable.GetResourceFullPath(pchResourceName,pchResourceTypeDirectory,pchPathBuffer,unBufferLen);
              return result;
       }
}


public class OpenVRInterop
{
       [DllImportAttribute("openvr_api", EntryPoint = "VR_InitInternal", CallingConvention = CallingConvention.Cdecl)]
       internal static extern uint InitInternal(ref EVRInitError peError, EVRApplicationType eApplicationType);
       [DllImportAttribute("openvr_api", EntryPoint = "VR_ShutdownInternal", CallingConvention = CallingConvention.Cdecl)]
       internal static extern void ShutdownInternal();
       [DllImportAttribute("openvr_api", EntryPoint = "VR_IsHmdPresent", CallingConvention = CallingConvention.Cdecl)]
       internal static extern bool IsHmdPresent();
       [DllImportAttribute("openvr_api", EntryPoint = "VR_IsRuntimeInstalled", CallingConvention = CallingConvention.Cdecl)]
       internal static extern bool IsRuntimeInstalled();
       [DllImportAttribute("openvr_api", EntryPoint = "VR_GetStringForHmdError", CallingConvention = CallingConvention.Cdecl)]
       internal static extern IntPtr GetStringForHmdError(EVRInitError error);
       [DllImportAttribute("openvr_api", EntryPoint = "VR_GetGenericInterface", CallingConvention = CallingConvention.Cdecl)]
       internal static extern IntPtr GetGenericInterface([In, MarshalAs(UnmanagedType.LPStr)] string pchInterfaceVersion, ref EVRInitError peError);
       [DllImportAttribute("openvr_api", EntryPoint = "VR_IsInterfaceVersionValid", CallingConvention = CallingConvention.Cdecl)]
       internal static extern bool IsInterfaceVersionValid([In, MarshalAs(UnmanagedType.LPStr)] string pchInterfaceVersion);
       [DllImportAttribute("openvr_api", EntryPoint = "VR_GetInitToken", CallingConvention = CallingConvention.Cdecl)]
       internal static extern uint GetInitToken();
}


public enum EVREye
{
       Eye_Left = 0,
       Eye_Right = 1,
}
public enum ETextureType
{
       DirectX = 0,
       OpenGL = 1,
       Vulkan = 2,
       IOSurface = 3,
       DirectX12 = 4,
}
public enum EColorSpace
{
       Auto = 0,
       Gamma = 1,
       Linear = 2,
}
public enum ETrackingResult
{
       Uninitialized = 1,
       Calibrating_InProgress = 100,
       Calibrating_OutOfRange = 101,
       Running_OK = 200,
       Running_OutOfRange = 201,
}
public enum ETrackedDeviceClass
{
       Invalid = 0,
       HMD = 1,
       Controller = 2,
       GenericTracker = 3,
       TrackingReference = 4,
}
public enum ETrackedControllerRole
{
       Invalid = 0,
       LeftHand = 1,
       RightHand = 2,
}
public enum ETrackingUniverseOrigin
{
       TrackingUniverseSeated = 0,
       TrackingUniverseStanding = 1,
       TrackingUniverseRawAndUncalibrated = 2,
}
public enum ETrackedDeviceProperty
{
       Prop_Invalid = 0,
       Prop_TrackingSystemName_String = 1000,
       Prop_ModelNumber_String = 1001,
       Prop_SerialNumber_String = 1002,
       Prop_RenderModelName_String = 1003,
       Prop_WillDriftInYaw_Bool = 1004,
       Prop_ManufacturerName_String = 1005,
       Prop_TrackingFirmwareVersion_String = 1006,
       Prop_HardwareRevision_String = 1007,
       Prop_AllWirelessDongleDescriptions_String = 1008,
       Prop_ConnectedWirelessDongle_String = 1009,
       Prop_DeviceIsWireless_Bool = 1010,
       Prop_DeviceIsCharging_Bool = 1011,
       Prop_DeviceBatteryPercentage_Float = 1012,
       Prop_StatusDisplayTransform_Matrix34 = 1013,
       Prop_Firmware_UpdateAvailable_Bool = 1014,
       Prop_Firmware_ManualUpdate_Bool = 1015,
       Prop_Firmware_ManualUpdateURL_String = 1016,
       Prop_HardwareRevision_Uint64 = 1017,
       Prop_FirmwareVersion_Uint64 = 1018,
       Prop_FPGAVersion_Uint64 = 1019,
       Prop_VRCVersion_Uint64 = 1020,
       Prop_RadioVersion_Uint64 = 1021,
       Prop_DongleVersion_Uint64 = 1022,
       Prop_BlockServerShutdown_Bool = 1023,
       Prop_CanUnifyCoordinateSystemWithHmd_Bool = 1024,
       Prop_ContainsProximitySensor_Bool = 1025,
       Prop_DeviceProvidesBatteryStatus_Bool = 1026,
       Prop_DeviceCanPowerOff_Bool = 1027,
       Prop_Firmware_ProgrammingTarget_String = 1028,
       Prop_DeviceClass_Int32 = 1029,
       Prop_HasCamera_Bool = 1030,
       Prop_DriverVersion_String = 1031,
       Prop_Firmware_ForceUpdateRequired_Bool = 1032,
       Prop_ViveSystemButtonFixRequired_Bool = 1033,
       Prop_ParentDriver_Uint64 = 1034,
       Prop_ReportsTimeSinceVSync_Bool = 2000,
       Prop_SecondsFromVsyncToPhotons_Float = 2001,
       Prop_DisplayFrequency_Float = 2002,
       Prop_UserIpdMeters_Float = 2003,
       Prop_CurrentUniverseId_Uint64 = 2004,
       Prop_PreviousUniverseId_Uint64 = 2005,
       Prop_DisplayFirmwareVersion_Uint64 = 2006,
       Prop_IsOnDesktop_Bool = 2007,
       Prop_DisplayMCType_Int32 = 2008,
       Prop_DisplayMCOffset_Float = 2009,
       Prop_DisplayMCScale_Float = 2010,
       Prop_EdidVendorID_Int32 = 2011,
       Prop_DisplayMCImageLeft_String = 2012,
       Prop_DisplayMCImageRight_String = 2013,
       Prop_DisplayGCBlackClamp_Float = 2014,
       Prop_EdidProductID_Int32 = 2015,
       Prop_CameraToHeadTransform_Matrix34 = 2016,
       Prop_DisplayGCType_Int32 = 2017,
       Prop_DisplayGCOffset_Float = 2018,
       Prop_DisplayGCScale_Float = 2019,
       Prop_DisplayGCPrescale_Float = 2020,
       Prop_DisplayGCImage_String = 2021,
       Prop_LensCenterLeftU_Float = 2022,
       Prop_LensCenterLeftV_Float = 2023,
       Prop_LensCenterRightU_Float = 2024,
       Prop_LensCenterRightV_Float = 2025,
       Prop_UserHeadToEyeDepthMeters_Float = 2026,
       Prop_CameraFirmwareVersion_Uint64 = 2027,
       Prop_CameraFirmwareDescription_String = 2028,
       Prop_DisplayFPGAVersion_Uint64 = 2029,
       Prop_DisplayBootloaderVersion_Uint64 = 2030,
       Prop_DisplayHardwareVersion_Uint64 = 2031,
       Prop_AudioFirmwareVersion_Uint64 = 2032,
       Prop_CameraCompatibilityMode_Int32 = 2033,
       Prop_ScreenshotHorizontalFieldOfViewDegrees_Float = 2034,
       Prop_ScreenshotVerticalFieldOfViewDegrees_Float = 2035,
       Prop_DisplaySuppressed_Bool = 2036,
       Prop_DisplayAllowNightMode_Bool = 2037,
       Prop_DisplayMCImageWidth_Int32 = 2038,
       Prop_DisplayMCImageHeight_Int32 = 2039,
       Prop_DisplayMCImageNumChannels_Int32 = 2040,
       Prop_DisplayMCImageData_Binary = 2041,
       Prop_UsesDriverDirectMode_Bool = 2042,
       Prop_AttachedDeviceId_String = 3000,
       Prop_SupportedButtons_Uint64 = 3001,
       Prop_Axis0Type_Int32 = 3002,
       Prop_Axis1Type_Int32 = 3003,
       Prop_Axis2Type_Int32 = 3004,
       Prop_Axis3Type_Int32 = 3005,
       Prop_Axis4Type_Int32 = 3006,
       Prop_ControllerRoleHint_Int32 = 3007,
       Prop_FieldOfViewLeftDegrees_Float = 4000,
       Prop_FieldOfViewRightDegrees_Float = 4001,
       Prop_FieldOfViewTopDegrees_Float = 4002,
       Prop_FieldOfViewBottomDegrees_Float = 4003,
       Prop_TrackingRangeMinimumMeters_Float = 4004,
       Prop_TrackingRangeMaximumMeters_Float = 4005,
       Prop_ModeLabel_String = 4006,
       Prop_IconPathName_String = 5000,
       Prop_NamedIconPathDeviceOff_String = 5001,
       Prop_NamedIconPathDeviceSearching_String = 5002,
       Prop_NamedIconPathDeviceSearchingAlert_String = 5003,
       Prop_NamedIconPathDeviceReady_String = 5004,
       Prop_NamedIconPathDeviceReadyAlert_String = 5005,
       Prop_NamedIconPathDeviceNotReady_String = 5006,
       Prop_NamedIconPathDeviceStandby_String = 5007,
       Prop_NamedIconPathDeviceAlertLow_String = 5008,
       Prop_DisplayHiddenArea_Binary_Start = 5100,
       Prop_DisplayHiddenArea_Binary_End = 5150,
       Prop_UserConfigPath_String = 6000,
       Prop_InstallPath_String = 6001,
       Prop_VendorSpecific_Reserved_Start = 10000,
       Prop_VendorSpecific_Reserved_End = 10999,
}
public enum ETrackedPropertyError
{
       TrackedProp_Success = 0,
       TrackedProp_WrongDataType = 1,
       TrackedProp_WrongDeviceClass = 2,
       TrackedProp_BufferTooSmall = 3,
       TrackedProp_UnknownProperty = 4,
       TrackedProp_InvalidDevice = 5,
       TrackedProp_CouldNotContactServer = 6,
       TrackedProp_ValueNotProvidedByDevice = 7,
       TrackedProp_StringExceedsMaximumLength = 8,
       TrackedProp_NotYetAvailable = 9,
       TrackedProp_PermissionDenied = 10,
       TrackedProp_InvalidOperation = 11,
}
public enum EVRSubmitFlags
{
       Submit_Default = 0,
       Submit_LensDistortionAlreadyApplied = 1,
       Submit_GlRenderBuffer = 2,
       Submit_Reserved = 4,
}
public enum EVRState
{
       Undefined = -1,
       Off = 0,
       Searching = 1,
       Searching_Alert = 2,
       Ready = 3,
       Ready_Alert = 4,
       NotReady = 5,
       Standby = 6,
       Ready_Alert_Low = 7,
}
public enum EVREventType
{
       VREvent_None = 0,
       VREvent_TrackedDeviceActivated = 100,
       VREvent_TrackedDeviceDeactivated = 101,
       VREvent_TrackedDeviceUpdated = 102,
       VREvent_TrackedDeviceUserInteractionStarted = 103,
       VREvent_TrackedDeviceUserInteractionEnded = 104,
       VREvent_IpdChanged = 105,
       VREvent_EnterStandbyMode = 106,
       VREvent_LeaveStandbyMode = 107,
       VREvent_TrackedDeviceRoleChanged = 108,
       VREvent_WatchdogWakeUpRequested = 109,
       VREvent_LensDistortionChanged = 110,
       VREvent_PropertyChanged = 111,
       VREvent_ButtonPress = 200,
       VREvent_ButtonUnpress = 201,
       VREvent_ButtonTouch = 202,
       VREvent_ButtonUntouch = 203,
       VREvent_MouseMove = 300,
       VREvent_MouseButtonDown = 301,
       VREvent_MouseButtonUp = 302,
       VREvent_FocusEnter = 303,
       VREvent_FocusLeave = 304,
       VREvent_Scroll = 305,
       VREvent_TouchPadMove = 306,
       VREvent_OverlayFocusChanged = 307,
       VREvent_InputFocusCaptured = 400,
       VREvent_InputFocusReleased = 401,
       VREvent_SceneFocusLost = 402,
       VREvent_SceneFocusGained = 403,
       VREvent_SceneApplicationChanged = 404,
       VREvent_SceneFocusChanged = 405,
       VREvent_InputFocusChanged = 406,
       VREvent_SceneApplicationSecondaryRenderingStarted = 407,
       VREvent_HideRenderModels = 410,
       VREvent_ShowRenderModels = 411,
       VREvent_OverlayShown = 500,
       VREvent_OverlayHidden = 501,
       VREvent_DashboardActivated = 502,
       VREvent_DashboardDeactivated = 503,
       VREvent_DashboardThumbSelected = 504,
       VREvent_DashboardRequested = 505,
       VREvent_ResetDashboard = 506,
       VREvent_RenderToast = 507,
       VREvent_ImageLoaded = 508,
       VREvent_ShowKeyboard = 509,
       VREvent_HideKeyboard = 510,
       VREvent_OverlayGamepadFocusGained = 511,
       VREvent_OverlayGamepadFocusLost = 512,
       VREvent_OverlaySharedTextureChanged = 513,
       VREvent_DashboardGuideButtonDown = 514,
       VREvent_DashboardGuideButtonUp = 515,
       VREvent_ScreenshotTriggered = 516,
       VREvent_ImageFailed = 517,
       VREvent_DashboardOverlayCreated = 518,
       VREvent_RequestScreenshot = 520,
       VREvent_ScreenshotTaken = 521,
       VREvent_ScreenshotFailed = 522,
       VREvent_SubmitScreenshotToDashboard = 523,
       VREvent_ScreenshotProgressToDashboard = 524,
       VREvent_PrimaryDashboardDeviceChanged = 525,
       VREvent_Notification_Shown = 600,
       VREvent_Notification_Hidden = 601,
       VREvent_Notification_BeginInteraction = 602,
       VREvent_Notification_Destroyed = 603,
       VREvent_Quit = 700,
       VREvent_ProcessQuit = 701,
       VREvent_QuitAborted_UserPrompt = 702,
       VREvent_QuitAcknowledged = 703,
       VREvent_DriverRequestedQuit = 704,
       VREvent_ChaperoneDataHasChanged = 800,
       VREvent_ChaperoneUniverseHasChanged = 801,
       VREvent_ChaperoneTempDataHasChanged = 802,
       VREvent_ChaperoneSettingsHaveChanged = 803,
       VREvent_SeatedZeroPoseReset = 804,
       VREvent_AudioSettingsHaveChanged = 820,
       VREvent_BackgroundSettingHasChanged = 850,
       VREvent_CameraSettingsHaveChanged = 851,
       VREvent_ReprojectionSettingHasChanged = 852,
       VREvent_ModelSkinSettingsHaveChanged = 853,
       VREvent_EnvironmentSettingsHaveChanged = 854,
       VREvent_PowerSettingsHaveChanged = 855,
       VREvent_StatusUpdate = 900,
       VREvent_MCImageUpdated = 1000,
       VREvent_FirmwareUpdateStarted = 1100,
       VREvent_FirmwareUpdateFinished = 1101,
       VREvent_KeyboardClosed = 1200,
       VREvent_KeyboardCharInput = 1201,
       VREvent_KeyboardDone = 1202,
       VREvent_ApplicationTransitionStarted = 1300,
       VREvent_ApplicationTransitionAborted = 1301,
       VREvent_ApplicationTransitionNewAppStarted = 1302,
       VREvent_ApplicationListUpdated = 1303,
       VREvent_ApplicationMimeTypeLoad = 1304,
       VREvent_ApplicationTransitionNewAppLaunchComplete = 1305,
       VREvent_Compositor_MirrorWindowShown = 1400,
       VREvent_Compositor_MirrorWindowHidden = 1401,
       VREvent_Compositor_ChaperoneBoundsShown = 1410,
       VREvent_Compositor_ChaperoneBoundsHidden = 1411,
       VREvent_TrackedCamera_StartVideoStream = 1500,
       VREvent_TrackedCamera_StopVideoStream = 1501,
       VREvent_TrackedCamera_PauseVideoStream = 1502,
       VREvent_TrackedCamera_ResumeVideoStream = 1503,
       VREvent_TrackedCamera_EditingSurface = 1550,
       VREvent_PerformanceTest_EnableCapture = 1600,
       VREvent_PerformanceTest_DisableCapture = 1601,
       VREvent_PerformanceTest_FidelityLevel = 1602,
       VREvent_MessageOverlay_Closed = 1650,
       VREvent_VendorSpecific_Reserved_Start = 10000,
       VREvent_VendorSpecific_Reserved_End = 19999,
}
public enum EDeviceActivityLevel
{
       k_EDeviceActivityLevel_Unknown = -1,
       k_EDeviceActivityLevel_Idle = 0,
       k_EDeviceActivityLevel_UserInteraction = 1,
       k_EDeviceActivityLevel_UserInteraction_Timeout = 2,
       k_EDeviceActivityLevel_Standby = 3,
}
public enum EVRButtonId
{
       k_EButton_System = 0,
       k_EButton_ApplicationMenu = 1,
       k_EButton_Grip = 2,
       k_EButton_DPad_Left = 3,
       k_EButton_DPad_Up = 4,
       k_EButton_DPad_Right = 5,
       k_EButton_DPad_Down = 6,
       k_EButton_A = 7,
       k_EButton_ProximitySensor = 31,
       k_EButton_Axis0 = 32,
       k_EButton_Axis1 = 33,
       k_EButton_Axis2 = 34,
       k_EButton_Axis3 = 35,
       k_EButton_Axis4 = 36,
       k_EButton_SteamVR_Touchpad = 32,
       k_EButton_SteamVR_Trigger = 33,
       k_EButton_Dashboard_Back = 2,
       k_EButton_Max = 64,
}
public enum EVRMouseButton
{
       Left = 1,
       Right = 2,
       Middle = 4,
}
public enum EHiddenAreaMeshType
{
       k_eHiddenAreaMesh_Standard = 0,
       k_eHiddenAreaMesh_Inverse = 1,
       k_eHiddenAreaMesh_LineLoop = 2,
       k_eHiddenAreaMesh_Max = 3,
}
public enum EVRControllerAxisType
{
       k_eControllerAxis_None = 0,
       k_eControllerAxis_TrackPad = 1,
       k_eControllerAxis_Joystick = 2,
       k_eControllerAxis_Trigger = 3,
}
public enum EVRControllerEventOutputType
{
       ControllerEventOutput_OSEvents = 0,
       ControllerEventOutput_VREvents = 1,
}
public enum ECollisionBoundsStyle
{
       COLLISION_BOUNDS_STYLE_BEGINNER = 0,
       COLLISION_BOUNDS_STYLE_INTERMEDIATE = 1,
       COLLISION_BOUNDS_STYLE_SQUARES = 2,
       COLLISION_BOUNDS_STYLE_ADVANCED = 3,
       COLLISION_BOUNDS_STYLE_NONE = 4,
       COLLISION_BOUNDS_STYLE_COUNT = 5,
}
public enum EVROverlayError
{
       None = 0,
       UnknownOverlay = 10,
       InvalidHandle = 11,
       PermissionDenied = 12,
       OverlayLimitExceeded = 13,
       WrongVisibilityType = 14,
       KeyTooLong = 15,
       NameTooLong = 16,
       KeyInUse = 17,
       WrongTransformType = 18,
       InvalidTrackedDevice = 19,
       InvalidParameter = 20,
       ThumbnailCantBeDestroyed = 21,
       ArrayTooSmall = 22,
       RequestFailed = 23,
       InvalidTexture = 24,
       UnableToLoadFile = 25,
       KeyboardAlreadyInUse = 26,
       NoNeighbor = 27,
       TooManyMaskPrimitives = 29,
       BadMaskPrimitive = 30,
}
public enum EVRApplicationType
{
       VRApplication_Other = 0,
       VRApplication_Scene = 1,
       VRApplication_Overlay = 2,
       VRApplication_Background = 3,
       VRApplication_Utility = 4,
       VRApplication_VRMonitor = 5,
       VRApplication_SteamWatchdog = 6,
       VRApplication_Max = 7,
}
public enum EVRFirmwareError
{
       None = 0,
       Success = 1,
       Fail = 2,
}
public enum EVRNotificationError
{
       OK = 0,
       InvalidNotificationId = 100,
       NotificationQueueFull = 101,
       InvalidOverlayHandle = 102,
       SystemWithUserValueAlreadyExists = 103,
}
public enum EVRInitError
{
       None = 0,
       Unknown = 1,
       Init_InstallationNotFound = 100,
       Init_InstallationCorrupt = 101,
       Init_VRClientDLLNotFound = 102,
       Init_FileNotFound = 103,
       Init_FactoryNotFound = 104,
       Init_InterfaceNotFound = 105,
       Init_InvalidInterface = 106,
       Init_UserConfigDirectoryInvalid = 107,
       Init_HmdNotFound = 108,
       Init_NotInitialized = 109,
       Init_PathRegistryNotFound = 110,
       Init_NoConfigPath = 111,
       Init_NoLogPath = 112,
       Init_PathRegistryNotWritable = 113,
       Init_AppInfoInitFailed = 114,
       Init_Retry = 115,
       Init_InitCanceledByUser = 116,
       Init_AnotherAppLaunching = 117,
       Init_SettingsInitFailed = 118,
       Init_ShuttingDown = 119,
       Init_TooManyObjects = 120,
       Init_NoServerForBackgroundApp = 121,
       Init_NotSupportedWithCompositor = 122,
       Init_NotAvailableToUtilityApps = 123,
       Init_Internal = 124,
       Init_HmdDriverIdIsNone = 125,
       Init_HmdNotFoundPresenceFailed = 126,
       Init_VRMonitorNotFound = 127,
       Init_VRMonitorStartupFailed = 128,
       Init_LowPowerWatchdogNotSupported = 129,
       Init_InvalidApplicationType = 130,
       Init_NotAvailableToWatchdogApps = 131,
       Init_WatchdogDisabledInSettings = 132,
       Init_VRDashboardNotFound = 133,
       Init_VRDashboardStartupFailed = 134,
       Driver_Failed = 200,
       Driver_Unknown = 201,
       Driver_HmdUnknown = 202,
       Driver_NotLoaded = 203,
       Driver_RuntimeOutOfDate = 204,
       Driver_HmdInUse = 205,
       Driver_NotCalibrated = 206,
       Driver_CalibrationInvalid = 207,
       Driver_HmdDisplayNotFound = 208,
       Driver_TrackedDeviceInterfaceUnknown = 209,
       Driver_HmdDriverIdOutOfBounds = 211,
       Driver_HmdDisplayMirrored = 212,
       IPC_ServerInitFailed = 300,
       IPC_ConnectFailed = 301,
       IPC_SharedStateInitFailed = 302,
       IPC_CompositorInitFailed = 303,
       IPC_MutexInitFailed = 304,
       IPC_Failed = 305,
       IPC_CompositorConnectFailed = 306,
       IPC_CompositorInvalidConnectResponse = 307,
       IPC_ConnectFailedAfterMultipleAttempts = 308,
       Compositor_Failed = 400,
       Compositor_D3D11HardwareRequired = 401,
       Compositor_FirmwareRequiresUpdate = 402,
       Compositor_OverlayInitFailed = 403,
       Compositor_ScreenshotsInitFailed = 404,
       VendorSpecific_UnableToConnectToOculusRuntime = 1000,
       VendorSpecific_HmdFound_CantOpenDevice = 1101,
       VendorSpecific_HmdFound_UnableToRequestConfigStart = 1102,
       VendorSpecific_HmdFound_NoStoredConfig = 1103,
       VendorSpecific_HmdFound_ConfigTooBig = 1104,
       VendorSpecific_HmdFound_ConfigTooSmall = 1105,
       VendorSpecific_HmdFound_UnableToInitZLib = 1106,
       VendorSpecific_HmdFound_CantReadFirmwareVersion = 1107,
       VendorSpecific_HmdFound_UnableToSendUserDataStart = 1108,
       VendorSpecific_HmdFound_UnableToGetUserDataStart = 1109,
       VendorSpecific_HmdFound_UnableToGetUserDataNext = 1110,
       VendorSpecific_HmdFound_UserDataAddressRange = 1111,
       VendorSpecific_HmdFound_UserDataError = 1112,
       VendorSpecific_HmdFound_ConfigFailedSanityCheck = 1113,
       Steam_SteamInstallationNotFound = 2000,
}
public enum EVRScreenshotType
{
       None = 0,
       Mono = 1,
       Stereo = 2,
       Cubemap = 3,
       MonoPanorama = 4,
       StereoPanorama = 5,
}
public enum EVRScreenshotPropertyFilenames
{
       Preview = 0,
       VR = 1,
}
public enum EVRTrackedCameraError
{
       None = 0,
       OperationFailed = 100,
       InvalidHandle = 101,
       InvalidFrameHeaderVersion = 102,
       OutOfHandles = 103,
       IPCFailure = 104,
       NotSupportedForThisDevice = 105,
       SharedMemoryFailure = 106,
       FrameBufferingFailure = 107,
       StreamSetupFailure = 108,
       InvalidGLTextureId = 109,
       InvalidSharedTextureHandle = 110,
       FailedToGetGLTextureId = 111,
       SharedTextureFailure = 112,
       NoFrameAvailable = 113,
       InvalidArgument = 114,
       InvalidFrameBufferSize = 115,
}
public enum EVRTrackedCameraFrameType
{
       Distorted = 0,
       Undistorted = 1,
       MaximumUndistorted = 2,
       MAX_CAMERA_FRAME_TYPES = 3,
}
public enum EVRApplicationError
{
       None = 0,
       AppKeyAlreadyExists = 100,
       NoManifest = 101,
       NoApplication = 102,
       InvalidIndex = 103,
       UnknownApplication = 104,
       IPCFailed = 105,
       ApplicationAlreadyRunning = 106,
       InvalidManifest = 107,
       InvalidApplication = 108,
       LaunchFailed = 109,
       ApplicationAlreadyStarting = 110,
       LaunchInProgress = 111,
       OldApplicationQuitting = 112,
       TransitionAborted = 113,
       IsTemplate = 114,
       BufferTooSmall = 200,
       PropertyNotSet = 201,
       UnknownProperty = 202,
       InvalidParameter = 203,
}
public enum EVRApplicationProperty
{
       Name_String = 0,
       LaunchType_String = 11,
       WorkingDirectory_String = 12,
       BinaryPath_String = 13,
       Arguments_String = 14,
       URL_String = 15,
       Description_String = 50,
       NewsURL_String = 51,
       ImagePath_String = 52,
       Source_String = 53,
       IsDashboardOverlay_Bool = 60,
       IsTemplate_Bool = 61,
       IsInstanced_Bool = 62,
       IsInternal_Bool = 63,
       LastLaunchTime_Uint64 = 70,
}
public enum EVRApplicationTransitionState
{
       VRApplicationTransition_None = 0,
       VRApplicationTransition_OldAppQuitSent = 10,
       VRApplicationTransition_WaitingForExternalLaunch = 11,
       VRApplicationTransition_NewAppLaunched = 20,
}
public enum ChaperoneCalibrationState
{
       OK = 1,
       Warning = 100,
       Warning_BaseStationMayHaveMoved = 101,
       Warning_BaseStationRemoved = 102,
       Warning_SeatedBoundsInvalid = 103,
       Error = 200,
       Error_BaseStationUninitialized = 201,
       Error_BaseStationConflict = 202,
       Error_PlayAreaInvalid = 203,
       Error_CollisionBoundsInvalid = 204,
}
public enum EChaperoneConfigFile
{
       Live = 1,
       Temp = 2,
}
public enum EChaperoneImportFlags
{
       EChaperoneImport_BoundsOnly = 1,
}
public enum EVRCompositorError
{
       None = 0,
       RequestFailed = 1,
       IncompatibleVersion = 100,
       DoNotHaveFocus = 101,
       InvalidTexture = 102,
       IsNotSceneApplication = 103,
       TextureIsOnWrongDevice = 104,
       TextureUsesUnsupportedFormat = 105,
       SharedTexturesNotSupported = 106,
       IndexOutOfRange = 107,
       AlreadySubmitted = 108,
}
public enum VROverlayInputMethod
{
       None = 0,
       Mouse = 1,
}
public enum VROverlayTransformType
{
       VROverlayTransform_Absolute = 0,
       VROverlayTransform_TrackedDeviceRelative = 1,
       VROverlayTransform_SystemOverlay = 2,
       VROverlayTransform_TrackedComponent = 3,
}
public enum VROverlayFlags
{
       None = 0,
       Curved = 1,
       RGSS4X = 2,
       NoDashboardTab = 3,
       AcceptsGamepadEvents = 4,
       ShowGamepadFocus = 5,
       SendVRScrollEvents = 6,
       SendVRTouchpadEvents = 7,
       ShowTouchPadScrollWheel = 8,
       TransferOwnershipToInternalProcess = 9,
       SideBySide_Parallel = 10,
       SideBySide_Crossed = 11,
       Panorama = 12,
       StereoPanorama = 13,
       SortWithNonSceneOverlays = 14,
       VisibleInDashboard = 15,
}
public enum VRMessageOverlayResponse
{
       ButtonPress_0 = 0,
       ButtonPress_1 = 1,
       ButtonPress_2 = 2,
       ButtonPress_3 = 3,
       CouldntFindSystemOverlay = 4,
       CouldntFindOrCreateClientOverlay = 5,
       ApplicationQuit = 6,
}
public enum EGamepadTextInputMode
{
       k_EGamepadTextInputModeNormal = 0,
       k_EGamepadTextInputModePassword = 1,
       k_EGamepadTextInputModeSubmit = 2,
}
public enum EGamepadTextInputLineMode
{
       k_EGamepadTextInputLineModeSingleLine = 0,
       k_EGamepadTextInputLineModeMultipleLines = 1,
}
public enum EOverlayDirection
{
       Up = 0,
       Down = 1,
       Left = 2,
       Right = 3,
       Count = 4,
}
public enum EVROverlayIntersectionMaskPrimitiveType
{
       OverlayIntersectionPrimitiveType_Rectangle = 0,
       OverlayIntersectionPrimitiveType_Circle = 1,
}
public enum EVRRenderModelError
{
       None = 0,
       Loading = 100,
       NotSupported = 200,
       InvalidArg = 300,
       InvalidModel = 301,
       NoShapes = 302,
       MultipleShapes = 303,
       TooManyVertices = 304,
       MultipleTextures = 305,
       BufferTooSmall = 306,
       NotEnoughNormals = 307,
       NotEnoughTexCoords = 308,
       InvalidTexture = 400,
}
public enum EVRComponentProperty
{
       IsStatic = 1,
       IsVisible = 2,
       IsTouched = 4,
       IsPressed = 8,
       IsScrolled = 16,
}
public enum EVRNotificationType
{
       Transient = 0,
       Persistent = 1,
       Transient_SystemWithUserValue = 2,
}
public enum EVRNotificationStyle
{
       None = 0,
       Application = 100,
       Contact_Disabled = 200,
       Contact_Enabled = 201,
       Contact_Active = 202,
}
public enum EVRSettingsError
{
       None = 0,
       IPCFailed = 1,
       WriteFailed = 2,
       ReadFailed = 3,
       JsonParseFailed = 4,
       UnsetSettingHasNoDefault = 5,
}
public enum EVRScreenshotError
{
       None = 0,
       RequestFailed = 1,
       IncompatibleVersion = 100,
       NotFound = 101,
       BufferTooSmall = 102,
       ScreenshotAlreadyInProgress = 108,
}

[StructLayout(LayoutKind.Explicit)] public struct VREvent_Data_t
{
       [FieldOffset(0)] public VREvent_Reserved_t reserved;
       [FieldOffset(0)] public VREvent_Controller_t controller;
       [FieldOffset(0)] public VREvent_Mouse_t mouse;
       [FieldOffset(0)] public VREvent_Scroll_t scroll;
       [FieldOffset(0)] public VREvent_Process_t process;
       [FieldOffset(0)] public VREvent_Notification_t notification;
       [FieldOffset(0)] public VREvent_Overlay_t overlay;
       [FieldOffset(0)] public VREvent_Status_t status;
       [FieldOffset(0)] public VREvent_Ipd_t ipd;
       [FieldOffset(0)] public VREvent_Chaperone_t chaperone;
       [FieldOffset(0)] public VREvent_PerformanceTest_t performanceTest;
       [FieldOffset(0)] public VREvent_TouchPadMove_t touchPadMove;
       [FieldOffset(0)] public VREvent_SeatedZeroPoseReset_t seatedZeroPoseReset;
       [FieldOffset(0)] public VREvent_Screenshot_t screenshot;
       [FieldOffset(0)] public VREvent_ScreenshotProgress_t screenshotProgress;
       [FieldOffset(0)] public VREvent_ApplicationLaunch_t applicationLaunch;
       [FieldOffset(0)] public VREvent_EditingCameraSurface_t cameraSurface;
       [FieldOffset(0)] public VREvent_MessageOverlay_t messageOverlay;
       [FieldOffset(0)] public VREvent_Keyboard_t keyboard; // This has to be at the end due to a mono bug
}


[StructLayout(LayoutKind.Explicit)] public struct VROverlayIntersectionMaskPrimitive_Data_t
{
       [FieldOffset(0)] public IntersectionMaskRectangle_t m_Rectangle;
       [FieldOffset(0)] public IntersectionMaskCircle_t m_Circle;
}

[StructLayout(LayoutKind.Sequential)] public struct HmdMatrix34_t
{
       public float m0; //float[3][4]
       public float m1;
       public float m2;
       public float m3;
       public float m4;
       public float m5;
       public float m6;
       public float m7;
       public float m8;
       public float m9;
       public float m10;
       public float m11;
}
[StructLayout(LayoutKind.Sequential)] public struct HmdMatrix44_t
{
       public float m0; //float[4][4]
       public float m1;
       public float m2;
       public float m3;
       public float m4;
       public float m5;
       public float m6;
       public float m7;
       public float m8;
       public float m9;
       public float m10;
       public float m11;
       public float m12;
       public float m13;
       public float m14;
       public float m15;
}
[StructLayout(LayoutKind.Sequential)] public struct HmdVector3_t
{
       public float v0; //float[3]
       public float v1;
       public float v2;
}
[StructLayout(LayoutKind.Sequential)] public struct HmdVector4_t
{
       public float v0; //float[4]
       public float v1;
       public float v2;
       public float v3;
}
[StructLayout(LayoutKind.Sequential)] public struct HmdVector3d_t
{
       public double v0; //double[3]
       public double v1;
       public double v2;
}
[StructLayout(LayoutKind.Sequential)] public struct HmdVector2_t
{
       public float v0; //float[2]
       public float v1;
}
[StructLayout(LayoutKind.Sequential)] public struct HmdQuaternion_t
{
       public double w;
       public double x;
       public double y;
       public double z;
}
[StructLayout(LayoutKind.Sequential)] public struct HmdColor_t
{
       public float r;
       public float g;
       public float b;
       public float a;
}
[StructLayout(LayoutKind.Sequential)] public struct HmdQuad_t
{
       public HmdVector3_t vCorners0; //HmdVector3_t[4]
       public HmdVector3_t vCorners1;
       public HmdVector3_t vCorners2;
       public HmdVector3_t vCorners3;
}
[StructLayout(LayoutKind.Sequential)] public struct HmdRect2_t
{
       public HmdVector2_t vTopLeft;
       public HmdVector2_t vBottomRight;
}
[StructLayout(LayoutKind.Sequential)] public struct DistortionCoordinates_t
{
       public float rfRed0; //float[2]
       public float rfRed1;
       public float rfGreen0; //float[2]
       public float rfGreen1;
       public float rfBlue0; //float[2]
       public float rfBlue1;
}
[StructLayout(LayoutKind.Sequential)] public struct Texture_t
{
       public IntPtr handle; // void *
       public ETextureType eType;
       public EColorSpace eColorSpace;
}
[StructLayout(LayoutKind.Sequential)] public struct TrackedDevicePose_t
{
       public HmdMatrix34_t mDeviceToAbsoluteTracking;
       public HmdVector3_t vVelocity;
       public HmdVector3_t vAngularVelocity;
       public ETrackingResult eTrackingResult;
       [MarshalAs(UnmanagedType.I1)]
       public bool bPoseIsValid;
       [MarshalAs(UnmanagedType.I1)]
       public bool bDeviceIsConnected;
}
[StructLayout(LayoutKind.Sequential)] public struct VRTextureBounds_t
{
       public float uMin;
       public float vMin;
       public float uMax;
       public float vMax;
}
[StructLayout(LayoutKind.Sequential)] public struct VRVulkanTextureData_t
{
       public ulong m_nImage;
       public IntPtr m_pDevice; // struct VkDevice_T *
       public IntPtr m_pPhysicalDevice; // struct VkPhysicalDevice_T *
       public IntPtr m_pInstance; // struct VkInstance_T *
       public IntPtr m_pQueue; // struct VkQueue_T *
       public uint m_nQueueFamilyIndex;
       public uint m_nWidth;
       public uint m_nHeight;
       public uint m_nFormat;
       public uint m_nSampleCount;
}
[StructLayout(LayoutKind.Sequential)] public struct D3D12TextureData_t
{
       public IntPtr m_pResource; // struct ID3D12Resource *
       public IntPtr m_pCommandQueue; // struct ID3D12CommandQueue *
       public uint m_nNodeMask;
}
[StructLayout(LayoutKind.Sequential)] public struct VREvent_Controller_t
{
       public uint button;
}
[StructLayout(LayoutKind.Sequential)] public struct VREvent_Mouse_t
{
       public float x;
       public float y;
       public uint button;
}
[StructLayout(LayoutKind.Sequential)] public struct VREvent_Scroll_t
{
       public float xdelta;
       public float ydelta;
       public uint repeatCount;
}
[StructLayout(LayoutKind.Sequential)] public struct VREvent_TouchPadMove_t
{
       [MarshalAs(UnmanagedType.I1)]
       public bool bFingerDown;
       public float flSecondsFingerDown;
       public float fValueXFirst;
       public float fValueYFirst;
       public float fValueXRaw;
       public float fValueYRaw;
}
[StructLayout(LayoutKind.Sequential)] public struct VREvent_Notification_t
{
       public ulong ulUserValue;
       public uint notificationId;
}
[StructLayout(LayoutKind.Sequential)] public struct VREvent_Process_t
{
       public uint pid;
       public uint oldPid;
       [MarshalAs(UnmanagedType.I1)]
       public bool bForced;
}
[StructLayout(LayoutKind.Sequential)] public struct VREvent_Overlay_t
{
       public ulong overlayHandle;
}
[StructLayout(LayoutKind.Sequential)] public struct VREvent_Status_t
{
       public uint statusState;
}
[StructLayout(LayoutKind.Sequential)] public struct VREvent_Keyboard_t
{
       public byte cNewInput0,cNewInput1,cNewInput2,cNewInput3,cNewInput4,cNewInput5,cNewInput6,cNewInput7;
       public ulong uUserValue;
}
[StructLayout(LayoutKind.Sequential)] public struct VREvent_Ipd_t
{
       public float ipdMeters;
}
[StructLayout(LayoutKind.Sequential)] public struct VREvent_Chaperone_t
{
       public ulong m_nPreviousUniverse;
       public ulong m_nCurrentUniverse;
}
[StructLayout(LayoutKind.Sequential)] public struct VREvent_Reserved_t
{
       public ulong reserved0;
       public ulong reserved1;
}
[StructLayout(LayoutKind.Sequential)] public struct VREvent_PerformanceTest_t
{
       public uint m_nFidelityLevel;
}
[StructLayout(LayoutKind.Sequential)] public struct VREvent_SeatedZeroPoseReset_t
{
       [MarshalAs(UnmanagedType.I1)]
       public bool bResetBySystemMenu;
}
[StructLayout(LayoutKind.Sequential)] public struct VREvent_Screenshot_t
{
       public uint handle;
       public uint type;
}
[StructLayout(LayoutKind.Sequential)] public struct VREvent_ScreenshotProgress_t
{
       public float progress;
}
[StructLayout(LayoutKind.Sequential)] public struct VREvent_ApplicationLaunch_t
{
       public uint pid;
       public uint unArgsHandle;
}
[StructLayout(LayoutKind.Sequential)] public struct VREvent_EditingCameraSurface_t
{
       public ulong overlayHandle;
       public uint nVisualMode;
}
[StructLayout(LayoutKind.Sequential)] public struct VREvent_MessageOverlay_t
{
       public uint unVRMessageOverlayResponse;
}
[StructLayout(LayoutKind.Sequential)] public struct VREvent_Property_t
{
       public ulong container;
       public ETrackedDeviceProperty prop;
}
[StructLayout(LayoutKind.Sequential)] public struct VREvent_t
{
       public uint eventType;
       public uint trackedDeviceIndex;
       public float eventAgeSeconds;
       public VREvent_Data_t data;
}
[StructLayout(LayoutKind.Sequential)] public struct HiddenAreaMesh_t
{
       public IntPtr pVertexData; // const struct vr::HmdVector2_t *
       public uint unTriangleCount;
}
[StructLayout(LayoutKind.Sequential)] public struct VRControllerAxis_t
{
       public float x;
       public float y;
}
[StructLayout(LayoutKind.Sequential)] public struct VRControllerState_t
{
       public uint unPacketNum;
       public ulong ulButtonPressed;
       public ulong ulButtonTouched;
       public VRControllerAxis_t rAxis0; //VRControllerAxis_t[5]
       public VRControllerAxis_t rAxis1;
       public VRControllerAxis_t rAxis2;
       public VRControllerAxis_t rAxis3;
       public VRControllerAxis_t rAxis4;
}
// This structure is for backwards binary compatibility on Linux and OSX only
[StructLayout(LayoutKind.Sequential, Pack = 4)] public struct VRControllerState_t_Packed
{
       public uint unPacketNum;
       public ulong ulButtonPressed;
       public ulong ulButtonTouched;
       public VRControllerAxis_t rAxis0; //VRControllerAxis_t[5]
       public VRControllerAxis_t rAxis1;
       public VRControllerAxis_t rAxis2;
       public VRControllerAxis_t rAxis3;
       public VRControllerAxis_t rAxis4;
       public void Unpack(ref VRControllerState_t unpacked)
       {
              unpacked.unPacketNum = this.unPacketNum;
              unpacked.ulButtonPressed = this.ulButtonPressed;
              unpacked.ulButtonTouched = this.ulButtonTouched;
              unpacked.rAxis0 = this.rAxis0;
              unpacked.rAxis1 = this.rAxis1;
              unpacked.rAxis2 = this.rAxis2;
              unpacked.rAxis3 = this.rAxis3;
              unpacked.rAxis4 = this.rAxis4;
       }
}
[StructLayout(LayoutKind.Sequential)] public struct Compositor_OverlaySettings
{
       public uint size;
       [MarshalAs(UnmanagedType.I1)]
       public bool curved;
       [MarshalAs(UnmanagedType.I1)]
       public bool antialias;
       public float scale;
       public float distance;
       public float alpha;
       public float uOffset;
       public float vOffset;
       public float uScale;
       public float vScale;
       public float gridDivs;
       public float gridWidth;
       public float gridScale;
       public HmdMatrix44_t transform;
}
[StructLayout(LayoutKind.Sequential)] public struct CameraVideoStreamFrameHeader_t
{
       public EVRTrackedCameraFrameType eFrameType;
       public uint nWidth;
       public uint nHeight;
       public uint nBytesPerPixel;
       public uint nFrameSequence;
       public TrackedDevicePose_t standingTrackedDevicePose;
}
[StructLayout(LayoutKind.Sequential)] public struct AppOverrideKeys_t
{
       public IntPtr pchKey; // const char *
       public IntPtr pchValue; // const char *
}
[StructLayout(LayoutKind.Sequential)] public struct Compositor_FrameTiming
{
       public uint m_nSize;
       public uint m_nFrameIndex;
       public uint m_nNumFramePresents;
       public uint m_nNumMisPresented;
       public uint m_nNumDroppedFrames;
       public uint m_nReprojectionFlags;
       public double m_flSystemTimeInSeconds;
       public float m_flPreSubmitGpuMs;
       public float m_flPostSubmitGpuMs;
       public float m_flTotalRenderGpuMs;
       public float m_flCompositorRenderGpuMs;
       public float m_flCompositorRenderCpuMs;
       public float m_flCompositorIdleCpuMs;
       public float m_flClientFrameIntervalMs;
       public float m_flPresentCallCpuMs;
       public float m_flWaitForPresentCpuMs;
       public float m_flSubmitFrameMs;
       public float m_flWaitGetPosesCalledMs;
       public float m_flNewPosesReadyMs;
       public float m_flNewFrameReadyMs;
       public float m_flCompositorUpdateStartMs;
       public float m_flCompositorUpdateEndMs;
       public float m_flCompositorRenderStartMs;
       public TrackedDevicePose_t m_HmdPose;
}
[StructLayout(LayoutKind.Sequential)] public struct Compositor_CumulativeStats
{
       public uint m_nPid;
       public uint m_nNumFramePresents;
       public uint m_nNumDroppedFrames;
       public uint m_nNumReprojectedFrames;
       public uint m_nNumFramePresentsOnStartup;
       public uint m_nNumDroppedFramesOnStartup;
       public uint m_nNumReprojectedFramesOnStartup;
       public uint m_nNumLoading;
       public uint m_nNumFramePresentsLoading;
       public uint m_nNumDroppedFramesLoading;
       public uint m_nNumReprojectedFramesLoading;
       public uint m_nNumTimedOut;
       public uint m_nNumFramePresentsTimedOut;
       public uint m_nNumDroppedFramesTimedOut;
       public uint m_nNumReprojectedFramesTimedOut;
}
[StructLayout(LayoutKind.Sequential)] public struct VROverlayIntersectionParams_t
{
       public HmdVector3_t vSource;
       public HmdVector3_t vDirection;
       public ETrackingUniverseOrigin eOrigin;
}
[StructLayout(LayoutKind.Sequential)] public struct VROverlayIntersectionResults_t
{
       public HmdVector3_t vPoint;
       public HmdVector3_t vNormal;
       public HmdVector2_t vUVs;
       public float fDistance;
}
[StructLayout(LayoutKind.Sequential)] public struct IntersectionMaskRectangle_t
{
       public float m_flTopLeftX;
       public float m_flTopLeftY;
       public float m_flWidth;
       public float m_flHeight;
}
[StructLayout(LayoutKind.Sequential)] public struct IntersectionMaskCircle_t
{
       public float m_flCenterX;
       public float m_flCenterY;
       public float m_flRadius;
}
[StructLayout(LayoutKind.Sequential)] public struct VROverlayIntersectionMaskPrimitive_t
{
       public EVROverlayIntersectionMaskPrimitiveType m_nPrimitiveType;
       public VROverlayIntersectionMaskPrimitive_Data_t m_Primitive;
}
[StructLayout(LayoutKind.Sequential)] public struct RenderModel_ComponentState_t
{
       public HmdMatrix34_t mTrackingToComponentRenderModel;
       public HmdMatrix34_t mTrackingToComponentLocal;
       public uint uProperties;
}
[StructLayout(LayoutKind.Sequential)] public struct RenderModel_Vertex_t
{
       public HmdVector3_t vPosition;
       public HmdVector3_t vNormal;
       public float rfTextureCoord0; //float[2]
       public float rfTextureCoord1;
}
[StructLayout(LayoutKind.Sequential)] public struct RenderModel_TextureMap_t
{
       public char unWidth;
       public char unHeight;
       public IntPtr rubTextureMapData; // const uint8_t *
}
// This structure is for backwards binary compatibility on Linux and OSX only
[StructLayout(LayoutKind.Sequential, Pack = 4)] public struct RenderModel_TextureMap_t_Packed
{
       public char unWidth;
       public char unHeight;
       public IntPtr rubTextureMapData; // const uint8_t *
       public void Unpack(ref RenderModel_TextureMap_t unpacked)
       {
              unpacked.unWidth = this.unWidth;
              unpacked.unHeight = this.unHeight;
              unpacked.rubTextureMapData = this.rubTextureMapData;
       }
}
[StructLayout(LayoutKind.Sequential)] public struct RenderModel_t
{
       public IntPtr rVertexData; // const struct vr::RenderModel_Vertex_t *
       public uint unVertexCount;
       public IntPtr rIndexData; // const uint16_t *
       public uint unTriangleCount;
       public int diffuseTextureId;
}
// This structure is for backwards binary compatibility on Linux and OSX only
[StructLayout(LayoutKind.Sequential, Pack = 4)] public struct RenderModel_t_Packed
{
       public IntPtr rVertexData; // const struct vr::RenderModel_Vertex_t *
       public uint unVertexCount;
       public IntPtr rIndexData; // const uint16_t *
       public uint unTriangleCount;
       public int diffuseTextureId;
       public void Unpack(ref RenderModel_t unpacked)
       {
              unpacked.rVertexData = this.rVertexData;
              unpacked.unVertexCount = this.unVertexCount;
              unpacked.rIndexData = this.rIndexData;
              unpacked.unTriangleCount = this.unTriangleCount;
              unpacked.diffuseTextureId = this.diffuseTextureId;
       }
}
[StructLayout(LayoutKind.Sequential)] public struct RenderModel_ControllerMode_State_t
{
       [MarshalAs(UnmanagedType.I1)]
       public bool bScrollWheelVisible;
}
[StructLayout(LayoutKind.Sequential)] public struct NotificationBitmap_t
{
       public IntPtr m_pImageData; // void *
       public int m_nWidth;
       public int m_nHeight;
       public int m_nBytesPerPixel;
}
[StructLayout(LayoutKind.Sequential)] public struct COpenVRContext
{
       public IntPtr m_pVRSystem; // class vr::IVRSystem *
       public IntPtr m_pVRChaperone; // class vr::IVRChaperone *
       public IntPtr m_pVRChaperoneSetup; // class vr::IVRChaperoneSetup *
       public IntPtr m_pVRCompositor; // class vr::IVRCompositor *
       public IntPtr m_pVROverlay; // class vr::IVROverlay *
       public IntPtr m_pVRResources; // class vr::IVRResources *
       public IntPtr m_pVRRenderModels; // class vr::IVRRenderModels *
       public IntPtr m_pVRExtendedDisplay; // class vr::IVRExtendedDisplay *
       public IntPtr m_pVRSettings; // class vr::IVRSettings *
       public IntPtr m_pVRApplications; // class vr::IVRApplications *
       public IntPtr m_pVRTrackedCamera; // class vr::IVRTrackedCamera *
       public IntPtr m_pVRScreenshots; // class vr::IVRScreenshots *
}

public class OpenVR
{

       public static uint InitInternal(ref EVRInitError peError, EVRApplicationType eApplicationType)
       {
              return OpenVRInterop.InitInternal(ref peError, eApplicationType);
       }

       public static void ShutdownInternal()
       {
              OpenVRInterop.ShutdownInternal();
       }

       public static bool IsHmdPresent()
       {
              return OpenVRInterop.IsHmdPresent();
       }

       public static bool IsRuntimeInstalled()
       {
              return OpenVRInterop.IsRuntimeInstalled();
       }

       public static string GetStringForHmdError(EVRInitError error)
       {
              return Marshal.PtrToStringAnsi(OpenVRInterop.GetStringForHmdError(error));
       }

       public static IntPtr GetGenericInterface(string pchInterfaceVersion, ref EVRInitError peError)
       {
              return OpenVRInterop.GetGenericInterface(pchInterfaceVersion, ref peError);
       }

       public static bool IsInterfaceVersionValid(string pchInterfaceVersion)
       {
              return OpenVRInterop.IsInterfaceVersionValid(pchInterfaceVersion);
       }

       public static uint GetInitToken()
       {
              return OpenVRInterop.GetInitToken();
       }

       public const uint k_unMaxDriverDebugResponseSize = 32768;
       public const uint k_unTrackedDeviceIndex_Hmd = 0;
       public const uint k_unMaxTrackedDeviceCount = 16;
       public const uint k_unTrackedDeviceIndexOther = 4294967294;
       public const uint k_unTrackedDeviceIndexInvalid = 4294967295;
       public const ulong k_ulInvalidPropertyContainer = 0;
       public const uint k_unInvalidPropertyTag = 0;
       public const uint k_unFloatPropertyTag = 1;
       public const uint k_unInt32PropertyTag = 2;
       public const uint k_unUint64PropertyTag = 3;
       public const uint k_unBoolPropertyTag = 4;
       public const uint k_unStringPropertyTag = 5;
       public const uint k_unHmdMatrix34PropertyTag = 20;
       public const uint k_unHmdMatrix44PropertyTag = 21;
       public const uint k_unHmdVector3PropertyTag = 22;
       public const uint k_unHmdVector4PropertyTag = 23;
       public const uint k_unHiddenAreaPropertyTag = 30;
       public const uint k_unOpenVRInternalReserved_Start = 1000;
       public const uint k_unOpenVRInternalReserved_End = 10000;
       public const uint k_unMaxPropertyStringSize = 32768;
       public const uint k_unControllerStateAxisCount = 5;
       public const ulong k_ulOverlayHandleInvalid = 0;
       public const uint k_unScreenshotHandleInvalid = 0;
       public const string IVRSystem_Version = "IVRSystem_015";
       public const string IVRExtendedDisplay_Version = "IVRExtendedDisplay_001";
       public const string IVRTrackedCamera_Version = "IVRTrackedCamera_003";
       public const uint k_unMaxApplicationKeyLength = 128;
       public const string k_pch_MimeType_HomeApp = "vr/home";
       public const string k_pch_MimeType_GameTheater = "vr/game_theater";
       public const string IVRApplications_Version = "IVRApplications_006";
       public const string IVRChaperone_Version = "IVRChaperone_003";
       public const string IVRChaperoneSetup_Version = "IVRChaperoneSetup_005";
       public const string IVRCompositor_Version = "IVRCompositor_020";
       public const uint k_unVROverlayMaxKeyLength = 128;
       public const uint k_unVROverlayMaxNameLength = 128;
       public const uint k_unMaxOverlayCount = 64;
       public const uint k_unMaxOverlayIntersectionMaskPrimitivesCount = 32;
       public const string IVROverlay_Version = "IVROverlay_014";
       public const string k_pch_Controller_Component_GDC2015 = "gdc2015";
       public const string k_pch_Controller_Component_Base = "base";
       public const string k_pch_Controller_Component_Tip = "tip";
       public const string k_pch_Controller_Component_HandGrip = "handgrip";
       public const string k_pch_Controller_Component_Status = "status";
       public const string IVRRenderModels_Version = "IVRRenderModels_005";
       public const uint k_unNotificationTextMaxSize = 256;
       public const string IVRNotifications_Version = "IVRNotifications_002";
       public const uint k_unMaxSettingsKeyLength = 128;
       public const string IVRSettings_Version = "IVRSettings_002";
       public const string k_pch_SteamVR_Section = "steamvr";
       public const string k_pch_SteamVR_RequireHmd_String = "requireHmd";
       public const string k_pch_SteamVR_ForcedDriverKey_String = "forcedDriver";
       public const string k_pch_SteamVR_ForcedHmdKey_String = "forcedHmd";
       public const string k_pch_SteamVR_DisplayDebug_Bool = "displayDebug";
       public const string k_pch_SteamVR_DebugProcessPipe_String = "debugProcessPipe";
       public const string k_pch_SteamVR_EnableDistortion_Bool = "enableDistortion";
       public const string k_pch_SteamVR_DisplayDebugX_Int32 = "displayDebugX";
       public const string k_pch_SteamVR_DisplayDebugY_Int32 = "displayDebugY";
       public const string k_pch_SteamVR_SendSystemButtonToAllApps_Bool = "sendSystemButtonToAllApps";
       public const string k_pch_SteamVR_LogLevel_Int32 = "loglevel";
       public const string k_pch_SteamVR_IPD_Float = "ipd";
       public const string k_pch_SteamVR_Background_String = "background";
       public const string k_pch_SteamVR_BackgroundUseDomeProjection_Bool = "backgroundUseDomeProjection";
       public const string k_pch_SteamVR_BackgroundCameraHeight_Float = "backgroundCameraHeight";
       public const string k_pch_SteamVR_BackgroundDomeRadius_Float = "backgroundDomeRadius";
       public const string k_pch_SteamVR_GridColor_String = "gridColor";
       public const string k_pch_SteamVR_PlayAreaColor_String = "playAreaColor";
       public const string k_pch_SteamVR_ShowStage_Bool = "showStage";
       public const string k_pch_SteamVR_ActivateMultipleDrivers_Bool = "activateMultipleDrivers";
       public const string k_pch_SteamVR_DirectMode_Bool = "directMode";
       public const string k_pch_SteamVR_DirectModeEdidVid_Int32 = "directModeEdidVid";
       public const string k_pch_SteamVR_DirectModeEdidPid_Int32 = "directModeEdidPid";
       public const string k_pch_SteamVR_UsingSpeakers_Bool = "usingSpeakers";
       public const string k_pch_SteamVR_SpeakersForwardYawOffsetDegrees_Float = "speakersForwardYawOffsetDegrees";
       public const string k_pch_SteamVR_BaseStationPowerManagement_Bool = "basestationPowerManagement";
       public const string k_pch_SteamVR_NeverKillProcesses_Bool = "neverKillProcesses";
       public const string k_pch_SteamVR_RenderTargetMultiplier_Float = "renderTargetMultiplier";
       public const string k_pch_SteamVR_AllowAsyncReprojection_Bool = "allowAsyncReprojection";
       public const string k_pch_SteamVR_AllowReprojection_Bool = "allowInterleavedReprojection";
       public const string k_pch_SteamVR_ForceReprojection_Bool = "forceReprojection";
       public const string k_pch_SteamVR_ForceFadeOnBadTracking_Bool = "forceFadeOnBadTracking";
       public const string k_pch_SteamVR_DefaultMirrorView_Int32 = "defaultMirrorView";
       public const string k_pch_SteamVR_ShowMirrorView_Bool = "showMirrorView";
       public const string k_pch_SteamVR_MirrorViewGeometry_String = "mirrorViewGeometry";
       public const string k_pch_SteamVR_StartMonitorFromAppLaunch = "startMonitorFromAppLaunch";
       public const string k_pch_SteamVR_StartCompositorFromAppLaunch_Bool = "startCompositorFromAppLaunch";
       public const string k_pch_SteamVR_StartDashboardFromAppLaunch_Bool = "startDashboardFromAppLaunch";
       public const string k_pch_SteamVR_StartOverlayAppsFromDashboard_Bool = "startOverlayAppsFromDashboard";
       public const string k_pch_SteamVR_EnableHomeApp = "enableHomeApp";
       public const string k_pch_SteamVR_SetInitialDefaultHomeApp = "setInitialDefaultHomeApp";
       public const string k_pch_SteamVR_CycleBackgroundImageTimeSec_Int32 = "CycleBackgroundImageTimeSec";
       public const string k_pch_SteamVR_RetailDemo_Bool = "retailDemo";
       public const string k_pch_SteamVR_IpdOffset_Float = "ipdOffset";
       public const string k_pch_Lighthouse_Section = "driver_lighthouse";
       public const string k_pch_Lighthouse_DisableIMU_Bool = "disableimu";
       public const string k_pch_Lighthouse_UseDisambiguation_String = "usedisambiguation";
       public const string k_pch_Lighthouse_DisambiguationDebug_Int32 = "disambiguationdebug";
       public const string k_pch_Lighthouse_PrimaryBasestation_Int32 = "primarybasestation";
       public const string k_pch_Lighthouse_DBHistory_Bool = "dbhistory";
       public const string k_pch_Null_Section = "driver_null";
       public const string k_pch_Null_SerialNumber_String = "serialNumber";
       public const string k_pch_Null_ModelNumber_String = "modelNumber";
       public const string k_pch_Null_WindowX_Int32 = "windowX";
       public const string k_pch_Null_WindowY_Int32 = "windowY";
       public const string k_pch_Null_WindowWidth_Int32 = "windowWidth";
       public const string k_pch_Null_WindowHeight_Int32 = "windowHeight";
       public const string k_pch_Null_RenderWidth_Int32 = "renderWidth";
       public const string k_pch_Null_RenderHeight_Int32 = "renderHeight";
       public const string k_pch_Null_SecondsFromVsyncToPhotons_Float = "secondsFromVsyncToPhotons";
       public const string k_pch_Null_DisplayFrequency_Float = "displayFrequency";
       public const string k_pch_UserInterface_Section = "userinterface";
       public const string k_pch_UserInterface_StatusAlwaysOnTop_Bool = "StatusAlwaysOnTop";
       public const string k_pch_UserInterface_MinimizeToTray_Bool = "MinimizeToTray";
       public const string k_pch_UserInterface_Screenshots_Bool = "screenshots";
       public const string k_pch_UserInterface_ScreenshotType_Int = "screenshotType";
       public const string k_pch_Notifications_Section = "notifications";
       public const string k_pch_Notifications_DoNotDisturb_Bool = "DoNotDisturb";
       public const string k_pch_Keyboard_Section = "keyboard";
       public const string k_pch_Keyboard_TutorialCompletions = "TutorialCompletions";
       public const string k_pch_Keyboard_ScaleX = "ScaleX";
       public const string k_pch_Keyboard_ScaleY = "ScaleY";
       public const string k_pch_Keyboard_OffsetLeftX = "OffsetLeftX";
       public const string k_pch_Keyboard_OffsetRightX = "OffsetRightX";
       public const string k_pch_Keyboard_OffsetY = "OffsetY";
       public const string k_pch_Keyboard_Smoothing = "Smoothing";
       public const string k_pch_Perf_Section = "perfcheck";
       public const string k_pch_Perf_HeuristicActive_Bool = "heuristicActive";
       public const string k_pch_Perf_NotifyInHMD_Bool = "warnInHMD";
       public const string k_pch_Perf_NotifyOnlyOnce_Bool = "warnOnlyOnce";
       public const string k_pch_Perf_AllowTimingStore_Bool = "allowTimingStore";
       public const string k_pch_Perf_SaveTimingsOnExit_Bool = "saveTimingsOnExit";
       public const string k_pch_Perf_TestData_Float = "perfTestData";
       public const string k_pch_CollisionBounds_Section = "collisionBounds";
       public const string k_pch_CollisionBounds_Style_Int32 = "CollisionBoundsStyle";
       public const string k_pch_CollisionBounds_GroundPerimeterOn_Bool = "CollisionBoundsGroundPerimeterOn";
       public const string k_pch_CollisionBounds_CenterMarkerOn_Bool = "CollisionBoundsCenterMarkerOn";
       public const string k_pch_CollisionBounds_PlaySpaceOn_Bool = "CollisionBoundsPlaySpaceOn";
       public const string k_pch_CollisionBounds_FadeDistance_Float = "CollisionBoundsFadeDistance";
       public const string k_pch_CollisionBounds_ColorGammaR_Int32 = "CollisionBoundsColorGammaR";
       public const string k_pch_CollisionBounds_ColorGammaG_Int32 = "CollisionBoundsColorGammaG";
       public const string k_pch_CollisionBounds_ColorGammaB_Int32 = "CollisionBoundsColorGammaB";
       public const string k_pch_CollisionBounds_ColorGammaA_Int32 = "CollisionBoundsColorGammaA";
       public const string k_pch_Camera_Section = "camera";
       public const string k_pch_Camera_EnableCamera_Bool = "enableCamera";
       public const string k_pch_Camera_EnableCameraInDashboard_Bool = "enableCameraInDashboard";
       public const string k_pch_Camera_EnableCameraForCollisionBounds_Bool = "enableCameraForCollisionBounds";
       public const string k_pch_Camera_EnableCameraForRoomView_Bool = "enableCameraForRoomView";
       public const string k_pch_Camera_BoundsColorGammaR_Int32 = "cameraBoundsColorGammaR";
       public const string k_pch_Camera_BoundsColorGammaG_Int32 = "cameraBoundsColorGammaG";
       public const string k_pch_Camera_BoundsColorGammaB_Int32 = "cameraBoundsColorGammaB";
       public const string k_pch_Camera_BoundsColorGammaA_Int32 = "cameraBoundsColorGammaA";
       public const string k_pch_Camera_BoundsStrength_Int32 = "cameraBoundsStrength";
       public const string k_pch_audio_Section = "audio";
       public const string k_pch_audio_OnPlaybackDevice_String = "onPlaybackDevice";
       public const string k_pch_audio_OnRecordDevice_String = "onRecordDevice";
       public const string k_pch_audio_OnPlaybackMirrorDevice_String = "onPlaybackMirrorDevice";
       public const string k_pch_audio_OffPlaybackDevice_String = "offPlaybackDevice";
       public const string k_pch_audio_OffRecordDevice_String = "offRecordDevice";
       public const string k_pch_audio_VIVEHDMIGain = "viveHDMIGain";
       public const string k_pch_Power_Section = "power";
       public const string k_pch_Power_PowerOffOnExit_Bool = "powerOffOnExit";
       public const string k_pch_Power_TurnOffScreensTimeout_Float = "turnOffScreensTimeout";
       public const string k_pch_Power_TurnOffControllersTimeout_Float = "turnOffControllersTimeout";
       public const string k_pch_Power_ReturnToWatchdogTimeout_Float = "returnToWatchdogTimeout";
       public const string k_pch_Power_AutoLaunchSteamVROnButtonPress = "autoLaunchSteamVROnButtonPress";
       public const string k_pch_Dashboard_Section = "dashboard";
       public const string k_pch_Dashboard_EnableDashboard_Bool = "enableDashboard";
       public const string k_pch_Dashboard_ArcadeMode_Bool = "arcadeMode";
       public const string k_pch_modelskin_Section = "modelskins";
       public const string k_pch_Driver_Enable_Bool = "enable";
       public const string IVRScreenshots_Version = "IVRScreenshots_001";
       public const string IVRResources_Version = "IVRResources_001";

       static uint VRToken { get; set; }

       const string FnTable_Prefix = "FnTable:";

       class COpenVRContext
       {
              public COpenVRContext() { Clear(); }

              public void Clear()
              {
                     m_pVRSystem = null;
                     m_pVRChaperone = null;
                     m_pVRChaperoneSetup = null;
                     m_pVRCompositor = null;
                     m_pVROverlay = null;
                     m_pVRRenderModels = null;
                     m_pVRExtendedDisplay = null;
                     m_pVRSettings = null;
                     m_pVRApplications = null;
                     m_pVRScreenshots = null;
                     m_pVRTrackedCamera = null;
              }

              void CheckClear()
              {
                     if (VRToken != GetInitToken())
                     {
                            Clear();
                            VRToken = GetInitToken();
                     }
              }

              public CVRSystem VRSystem()
              {
                     CheckClear();
                     if (m_pVRSystem == null)
                     {
                            var eError = EVRInitError.None;
                            var pInterface = OpenVRInterop.GetGenericInterface(FnTable_Prefix+IVRSystem_Version, ref eError);
                            if (pInterface != IntPtr.Zero && eError == EVRInitError.None)
                                   m_pVRSystem = new CVRSystem(pInterface);
                     }
                     return m_pVRSystem;
              }

              public CVRChaperone VRChaperone()
              {
                     CheckClear();
                     if (m_pVRChaperone == null)
                     {
                            var eError = EVRInitError.None;
                            var pInterface = OpenVRInterop.GetGenericInterface(FnTable_Prefix+IVRChaperone_Version, ref eError);
                            if (pInterface != IntPtr.Zero && eError == EVRInitError.None)
                                   m_pVRChaperone = new CVRChaperone(pInterface);
                     }
                     return m_pVRChaperone;
              }

              public CVRChaperoneSetup VRChaperoneSetup()
              {
                     CheckClear();
                     if (m_pVRChaperoneSetup == null)
                     {
                            var eError = EVRInitError.None;
                            var pInterface = OpenVRInterop.GetGenericInterface(FnTable_Prefix+IVRChaperoneSetup_Version, ref eError);
                            if (pInterface != IntPtr.Zero && eError == EVRInitError.None)
                                   m_pVRChaperoneSetup = new CVRChaperoneSetup(pInterface);
                     }
                     return m_pVRChaperoneSetup;
              }

              public CVRCompositor VRCompositor()
              {
                     CheckClear();
                     if (m_pVRCompositor == null)
                     {
                            var eError = EVRInitError.None;
                            var pInterface = OpenVRInterop.GetGenericInterface(FnTable_Prefix+IVRCompositor_Version, ref eError);
                            if (pInterface != IntPtr.Zero && eError == EVRInitError.None)
                                   m_pVRCompositor = new CVRCompositor(pInterface);
                     }
                     return m_pVRCompositor;
              }

              public CVROverlay VROverlay()
              {
                     CheckClear();
                     if (m_pVROverlay == null)
                     {
                            var eError = EVRInitError.None;
                            var pInterface = OpenVRInterop.GetGenericInterface(FnTable_Prefix+IVROverlay_Version, ref eError);
                            if (pInterface != IntPtr.Zero && eError == EVRInitError.None)
                                   m_pVROverlay = new CVROverlay(pInterface);
                     }
                     return m_pVROverlay;
              }

              public CVRRenderModels VRRenderModels()
              {
                     CheckClear();
                     if (m_pVRRenderModels == null)
                     {
                            var eError = EVRInitError.None;
                            var pInterface = OpenVRInterop.GetGenericInterface(FnTable_Prefix+IVRRenderModels_Version, ref eError);
                            if (pInterface != IntPtr.Zero && eError == EVRInitError.None)
                                   m_pVRRenderModels = new CVRRenderModels(pInterface);
                     }
                     return m_pVRRenderModels;
              }

              public CVRExtendedDisplay VRExtendedDisplay()
              {
                     CheckClear();
                     if (m_pVRExtendedDisplay == null)
                     {
                            var eError = EVRInitError.None;
                            var pInterface = OpenVRInterop.GetGenericInterface(FnTable_Prefix+IVRExtendedDisplay_Version, ref eError);
                            if (pInterface != IntPtr.Zero && eError == EVRInitError.None)
                                   m_pVRExtendedDisplay = new CVRExtendedDisplay(pInterface);
                     }
                     return m_pVRExtendedDisplay;
              }

              public CVRSettings VRSettings()
              {
                     CheckClear();
                     if (m_pVRSettings == null)
                     {
                            var eError = EVRInitError.None;
                            var pInterface = OpenVRInterop.GetGenericInterface(FnTable_Prefix+IVRSettings_Version, ref eError);
                            if (pInterface != IntPtr.Zero && eError == EVRInitError.None)
                                   m_pVRSettings = new CVRSettings(pInterface);
                     }
                     return m_pVRSettings;
              }

              public CVRApplications VRApplications()
              {
                     CheckClear();
                     if (m_pVRApplications == null)
                     {
                            var eError = EVRInitError.None;
                            var pInterface = OpenVRInterop.GetGenericInterface(FnTable_Prefix+IVRApplications_Version, ref eError);
                            if (pInterface != IntPtr.Zero && eError == EVRInitError.None)
                                   m_pVRApplications = new CVRApplications(pInterface);
                     }
                     return m_pVRApplications;
              }

              public CVRScreenshots VRScreenshots()
              {
                     CheckClear();
                     if (m_pVRScreenshots == null)
                     {
                            var eError = EVRInitError.None;
                            var pInterface = OpenVRInterop.GetGenericInterface(FnTable_Prefix+IVRScreenshots_Version, ref eError);
                            if (pInterface != IntPtr.Zero && eError == EVRInitError.None)
                                   m_pVRScreenshots = new CVRScreenshots(pInterface);
                     }
                     return m_pVRScreenshots;
              }

              public CVRTrackedCamera VRTrackedCamera()
              {
                     CheckClear();
                     if (m_pVRTrackedCamera == null)
                     {
                            var eError = EVRInitError.None;
                            var pInterface = OpenVRInterop.GetGenericInterface(FnTable_Prefix+IVRTrackedCamera_Version, ref eError);
                            if (pInterface != IntPtr.Zero && eError == EVRInitError.None)
                                   m_pVRTrackedCamera = new CVRTrackedCamera(pInterface);
                     }
                     return m_pVRTrackedCamera;
              }

              private CVRSystem m_pVRSystem;
              private CVRChaperone m_pVRChaperone;
              private CVRChaperoneSetup m_pVRChaperoneSetup;
              private CVRCompositor m_pVRCompositor;
              private CVROverlay m_pVROverlay;
              private CVRRenderModels m_pVRRenderModels;
              private CVRExtendedDisplay m_pVRExtendedDisplay;
              private CVRSettings m_pVRSettings;
              private CVRApplications m_pVRApplications;
              private CVRScreenshots m_pVRScreenshots;
              private CVRTrackedCamera m_pVRTrackedCamera;
       };

       private static COpenVRContext _OpenVRInternal_ModuleContext = null;
       static COpenVRContext OpenVRInternal_ModuleContext
       {
              get
              {
                     if (_OpenVRInternal_ModuleContext == null)
                            _OpenVRInternal_ModuleContext = new COpenVRContext();
                     return _OpenVRInternal_ModuleContext;
              }
       }

       public static CVRSystem System { get { return OpenVRInternal_ModuleContext.VRSystem(); } }
       public static CVRChaperone Chaperone { get { return OpenVRInternal_ModuleContext.VRChaperone(); } }
       public static CVRChaperoneSetup ChaperoneSetup { get { return OpenVRInternal_ModuleContext.VRChaperoneSetup(); } }
       public static CVRCompositor Compositor { get { return OpenVRInternal_ModuleContext.VRCompositor(); } }
       public static CVROverlay Overlay { get { return OpenVRInternal_ModuleContext.VROverlay(); } }
       public static CVRRenderModels RenderModels { get { return OpenVRInternal_ModuleContext.VRRenderModels(); } }
       public static CVRExtendedDisplay ExtendedDisplay { get { return OpenVRInternal_ModuleContext.VRExtendedDisplay(); } }
       public static CVRSettings Settings { get { return OpenVRInternal_ModuleContext.VRSettings(); } }
       public static CVRApplications Applications { get { return OpenVRInternal_ModuleContext.VRApplications(); } }
       public static CVRScreenshots Screenshots { get { return OpenVRInternal_ModuleContext.VRScreenshots(); } }
       public static CVRTrackedCamera TrackedCamera { get { return OpenVRInternal_ModuleContext.VRTrackedCamera(); } }

       /** Finds the active installation of vrclient.dll and initializes it */
       public static CVRSystem Init(ref EVRInitError peError, EVRApplicationType eApplicationType = EVRApplicationType.VRApplication_Scene)
       {
              VRToken = InitInternal(ref peError, eApplicationType);
              OpenVRInternal_ModuleContext.Clear();

              if (peError != EVRInitError.None)
                     return null;

              bool bInterfaceValid = IsInterfaceVersionValid(IVRSystem_Version);
              if (!bInterfaceValid)
              {
                     ShutdownInternal();
                     peError = EVRInitError.Init_InterfaceNotFound;
                     return null;
              }

              return OpenVR.System;
       }

       /** unloads vrclient.dll. Any interface pointers from the interface are
       * invalid after this point */
       public static void Shutdown()
       {
              ShutdownInternal();
       }

}


}