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//
// Copyright 2014 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// Compiler.cpp: implements the gl::Compiler class.
#include "libANGLE/Compiler.h"
#include "common/debug.h"
#include "libANGLE/State.h"
#include "libANGLE/renderer/CompilerImpl.h"
#include "libANGLE/renderer/GLImplFactory.h"
namespace gl
{
namespace
{
// To know when to call sh::Initialize and sh::Finalize.
size_t gActiveCompilers = 0;
ShShaderSpec SelectShaderSpec(GLint majorVersion,
GLint minorVersion,
bool isWebGL,
EGLenum clientType)
{
// For Desktop GL
if (clientType == EGL_OPENGL_API)
{
return SH_GL_COMPATIBILITY_SPEC;
}
if (majorVersion >= 3)
{
if (minorVersion == 1)
{
return isWebGL ? SH_WEBGL3_SPEC : SH_GLES3_1_SPEC;
}
else
{
return isWebGL ? SH_WEBGL2_SPEC : SH_GLES3_SPEC;
}
}
// GLES1 emulation: Use GLES3 shader spec.
if (!isWebGL && majorVersion == 1)
{
return SH_GLES3_SPEC;
}
return isWebGL ? SH_WEBGL_SPEC : SH_GLES2_SPEC;
}
} // anonymous namespace
Compiler::Compiler(rx::GLImplFactory *implFactory, const State &state)
: mImplementation(implFactory->createCompiler()),
mSpec(SelectShaderSpec(state.getClientMajorVersion(),
state.getClientMinorVersion(),
state.getExtensions().webglCompatibility,
state.getClientType())),
mOutputType(mImplementation->getTranslatorOutputType()),
mResources()
{
// TODO(http://anglebug.com/3819): Update for GL version specific validation
ASSERT(state.getClientMajorVersion() == 1 || state.getClientMajorVersion() == 2 ||
state.getClientMajorVersion() == 3 || state.getClientMajorVersion() == 4);
const gl::Caps &caps = state.getCaps();
const gl::Extensions &extensions = state.getExtensions();
if (gActiveCompilers == 0)
{
sh::Initialize();
}
++gActiveCompilers;
sh::InitBuiltInResources(&mResources);
mResources.MaxVertexAttribs = caps.maxVertexAttributes;
mResources.MaxVertexUniformVectors = caps.maxVertexUniformVectors;
mResources.MaxVaryingVectors = caps.maxVaryingVectors;
mResources.MaxVertexTextureImageUnits = caps.maxShaderTextureImageUnits[ShaderType::Vertex];
mResources.MaxCombinedTextureImageUnits = caps.maxCombinedTextureImageUnits;
mResources.MaxTextureImageUnits = caps.maxShaderTextureImageUnits[ShaderType::Fragment];
mResources.MaxFragmentUniformVectors = caps.maxFragmentUniformVectors;
mResources.MaxDrawBuffers = caps.maxDrawBuffers;
mResources.OES_standard_derivatives = extensions.standardDerivativesOES;
mResources.EXT_draw_buffers = extensions.drawBuffers;
mResources.EXT_shader_texture_lod = extensions.shaderTextureLOD;
mResources.EXT_shader_non_constant_global_initializers =
extensions.shaderNonConstGlobalInitializersEXT;
mResources.OES_EGL_image_external = extensions.eglImageExternalOES;
mResources.OES_EGL_image_external_essl3 = extensions.eglImageExternalEssl3OES;
mResources.NV_EGL_stream_consumer_external = extensions.eglStreamConsumerExternalNV;
mResources.NV_shader_noperspective_interpolation = extensions.noperspectiveInterpolationNV;
mResources.ARB_texture_rectangle = extensions.textureRectangle;
mResources.EXT_gpu_shader5 = extensions.gpuShader5EXT;
mResources.OES_texture_storage_multisample_2d_array =
extensions.textureStorageMultisample2DArrayOES;
mResources.OES_texture_3D = extensions.texture3DOES;
mResources.ANGLE_texture_multisample = extensions.textureMultisample;
mResources.ANGLE_multi_draw = extensions.multiDraw;
mResources.ANGLE_base_vertex_base_instance = extensions.baseVertexBaseInstance;
mResources.APPLE_clip_distance = extensions.clipDistanceAPPLE;
// TODO: use shader precision caps to determine if high precision is supported?
mResources.FragmentPrecisionHigh = 1;
mResources.EXT_frag_depth = extensions.fragDepth;
// OVR_multiview state
mResources.OVR_multiview = extensions.multiview;
// OVR_multiview2 state
mResources.OVR_multiview2 = extensions.multiview2;
mResources.MaxViewsOVR = extensions.maxViews;
// EXT_multisampled_render_to_texture
mResources.EXT_multisampled_render_to_texture = extensions.multisampledRenderToTexture;
// WEBGL_video_texture
mResources.WEBGL_video_texture = extensions.webglVideoTexture;
// GLSL ES 3.0 constants
mResources.MaxVertexOutputVectors = caps.maxVertexOutputComponents / 4;
mResources.MaxFragmentInputVectors = caps.maxFragmentInputComponents / 4;
mResources.MinProgramTexelOffset = caps.minProgramTexelOffset;
mResources.MaxProgramTexelOffset = caps.maxProgramTexelOffset;
// EXT_blend_func_extended
mResources.EXT_blend_func_extended = extensions.blendFuncExtended;
mResources.MaxDualSourceDrawBuffers = extensions.maxDualSourceDrawBuffers;
// APPLE_clip_distance/EXT_clip_cull_distance
mResources.MaxClipDistances = caps.maxClipDistances;
// GLSL ES 3.1 constants
mResources.MaxProgramTextureGatherOffset = caps.maxProgramTextureGatherOffset;
mResources.MinProgramTextureGatherOffset = caps.minProgramTextureGatherOffset;
mResources.MaxImageUnits = caps.maxImageUnits;
mResources.MaxVertexImageUniforms = caps.maxShaderImageUniforms[ShaderType::Vertex];
mResources.MaxFragmentImageUniforms = caps.maxShaderImageUniforms[ShaderType::Fragment];
mResources.MaxComputeImageUniforms = caps.maxShaderImageUniforms[ShaderType::Compute];
mResources.MaxCombinedImageUniforms = caps.maxCombinedImageUniforms;
mResources.MaxCombinedShaderOutputResources = caps.maxCombinedShaderOutputResources;
mResources.MaxUniformLocations = caps.maxUniformLocations;
for (size_t index = 0u; index < 3u; ++index)
{
mResources.MaxComputeWorkGroupCount[index] = caps.maxComputeWorkGroupCount[index];
mResources.MaxComputeWorkGroupSize[index] = caps.maxComputeWorkGroupSize[index];
}
mResources.MaxComputeUniformComponents = caps.maxShaderUniformComponents[ShaderType::Compute];
mResources.MaxComputeTextureImageUnits = caps.maxShaderTextureImageUnits[ShaderType::Compute];
mResources.MaxComputeAtomicCounters = caps.maxShaderAtomicCounters[ShaderType::Compute];
mResources.MaxComputeAtomicCounterBuffers =
caps.maxShaderAtomicCounterBuffers[ShaderType::Compute];
mResources.MaxVertexAtomicCounters = caps.maxShaderAtomicCounters[ShaderType::Vertex];
mResources.MaxFragmentAtomicCounters = caps.maxShaderAtomicCounters[ShaderType::Fragment];
mResources.MaxCombinedAtomicCounters = caps.maxCombinedAtomicCounters;
mResources.MaxAtomicCounterBindings = caps.maxAtomicCounterBufferBindings;
mResources.MaxVertexAtomicCounterBuffers =
caps.maxShaderAtomicCounterBuffers[ShaderType::Vertex];
mResources.MaxFragmentAtomicCounterBuffers =
caps.maxShaderAtomicCounterBuffers[ShaderType::Fragment];
mResources.MaxCombinedAtomicCounterBuffers = caps.maxCombinedAtomicCounterBuffers;
mResources.MaxAtomicCounterBufferSize = caps.maxAtomicCounterBufferSize;
mResources.MaxUniformBufferBindings = caps.maxUniformBufferBindings;
mResources.MaxShaderStorageBufferBindings = caps.maxShaderStorageBufferBindings;
// Needed by point size clamping workaround
mResources.MaxPointSize = caps.maxAliasedPointSize;
if (state.getClientMajorVersion() == 2 && !extensions.drawBuffers)
{
mResources.MaxDrawBuffers = 1;
}
// Geometry Shader constants
mResources.EXT_geometry_shader = extensions.geometryShader;
mResources.MaxGeometryUniformComponents = caps.maxShaderUniformComponents[ShaderType::Geometry];
mResources.MaxGeometryUniformBlocks = caps.maxShaderUniformBlocks[ShaderType::Geometry];
mResources.MaxGeometryInputComponents = caps.maxGeometryInputComponents;
mResources.MaxGeometryOutputComponents = caps.maxGeometryOutputComponents;
mResources.MaxGeometryOutputVertices = caps.maxGeometryOutputVertices;
mResources.MaxGeometryTotalOutputComponents = caps.maxGeometryTotalOutputComponents;
mResources.MaxGeometryTextureImageUnits = caps.maxShaderTextureImageUnits[ShaderType::Geometry];
mResources.MaxGeometryAtomicCounterBuffers =
caps.maxShaderAtomicCounterBuffers[ShaderType::Geometry];
mResources.MaxGeometryAtomicCounters = caps.maxShaderAtomicCounters[ShaderType::Geometry];
mResources.MaxGeometryShaderStorageBlocks = caps.maxShaderStorageBlocks[ShaderType::Geometry];
mResources.MaxGeometryShaderInvocations = caps.maxGeometryShaderInvocations;
mResources.MaxGeometryImageUniforms = caps.maxShaderImageUniforms[ShaderType::Geometry];
// Subpixel bits.
mResources.SubPixelBits = static_cast<int>(caps.subPixelBits);
}
Compiler::~Compiler()
{
for (auto &pool : mPools)
{
for (ShCompilerInstance &instance : pool)
{
instance.destroy();
}
}
--gActiveCompilers;
if (gActiveCompilers == 0)
{
sh::Finalize();
}
}
ShCompilerInstance Compiler::getInstance(ShaderType type)
{
ASSERT(type != ShaderType::InvalidEnum);
auto &pool = mPools[type];
if (pool.empty())
{
ShHandle handle = sh::ConstructCompiler(ToGLenum(type), mSpec, mOutputType, &mResources);
ASSERT(handle);
return ShCompilerInstance(handle, mOutputType, type);
}
else
{
ShCompilerInstance instance = std::move(pool.back());
pool.pop_back();
return instance;
}
}
void Compiler::putInstance(ShCompilerInstance &&instance)
{
static constexpr size_t kMaxPoolSize = 32;
auto &pool = mPools[instance.getShaderType()];
if (pool.size() < kMaxPoolSize)
{
pool.push_back(std::move(instance));
}
else
{
instance.destroy();
}
}
ShCompilerInstance::ShCompilerInstance() : mHandle(nullptr) {}
ShCompilerInstance::ShCompilerInstance(ShHandle handle,
ShShaderOutput outputType,
ShaderType shaderType)
: mHandle(handle), mOutputType(outputType), mShaderType(shaderType)
{}
ShCompilerInstance::~ShCompilerInstance()
{
ASSERT(mHandle == nullptr);
}
void ShCompilerInstance::destroy()
{
if (mHandle != nullptr)
{
sh::Destruct(mHandle);
mHandle = nullptr;
}
}
ShCompilerInstance::ShCompilerInstance(ShCompilerInstance &&other)
: mHandle(other.mHandle), mOutputType(other.mOutputType), mShaderType(other.mShaderType)
{
other.mHandle = nullptr;
}
ShCompilerInstance &ShCompilerInstance::operator=(ShCompilerInstance &&other)
{
mHandle = other.mHandle;
mOutputType = other.mOutputType;
mShaderType = other.mShaderType;
other.mHandle = nullptr;
return *this;
}
ShHandle ShCompilerInstance::getHandle()
{
return mHandle;
}
ShaderType ShCompilerInstance::getShaderType() const
{
return mShaderType;
}
const std::string &ShCompilerInstance::getBuiltinResourcesString()
{
return sh::GetBuiltInResourcesString(mHandle);
}
ShShaderOutput ShCompilerInstance::getShaderOutputType() const
{
return mOutputType;
}
} // namespace gl