| Name |
| |
| ANGLE_d3d_texture_client_buffer |
| |
| Name Strings |
| |
| EGL_ANGLE_d3d_texture_client_buffer |
| |
| Contributors |
| |
| Geoff Lang |
| Olli Etuaho |
| Sunny Sachanandani |
| |
| Contacts |
| |
| Geoff Lang, Google Inc. (geofflang 'at' google.com) |
| |
| Status |
| |
| Draft |
| |
| Version |
| |
| Version 5, Sep 6, 2019 |
| |
| Number |
| |
| EGL Extension #?? |
| |
| Dependencies |
| |
| This extension is written against the wording of the EGL 1.2 |
| Specification. |
| |
| References the EGL_ANGLE_device_d3d and EGL_KHR_image_base extensions. |
| |
| Overview |
| |
| This extension allows creating EGL surfaces and EGL images from D3D texture |
| objects. |
| |
| New Types |
| |
| None |
| |
| New Procedures and Functions |
| |
| None |
| |
| New Tokens |
| |
| Accepted by the <target> parameter of eglCreateImageKHR and <buftype> |
| parameter of eglCreatePbufferFromClientBuffer: |
| |
| EGL_D3D_TEXTURE_ANGLE 0x33A3 |
| |
| Additions to Chapter 2 of the EGL 1.2 Specification (EGL Operation) |
| |
| Add to section 2.5.1 "EGLImage Specification" (as defined by the |
| EGL_KHR_image_base specification), in the description of |
| eglCreateImageKHR: |
| |
| "Values accepted for <target> are listed in Table aaa, below. |
| |
| +----------------------------+-----------------------------------------+ |
| | <target> | Notes | |
| +----------------------------+-----------------------------------------+ |
| | EGL_D3D_TEXTURE_ANGLE | Used for Direct3D11 texture objects | |
| +----------------------------+-----------------------------------------+ |
| Table aaa. Legal values for eglCreateImageKHR <target> parameter |
| |
| ... |
| |
| If <target> is EGL_D3D_TEXTURE_ANGLE, <dpy> must be a valid display, <ctx> |
| must be EGL_NO_CONTEXT, <buffer> must be a pointer to a valid D3D11 texture |
| object (cast into the type EGLClientBuffer), and attributes other than |
| EGL_TEXTURE_INTERNAL_FORMAT_ANGLE are ignored. The width and height of |
| the pbuffer are determined by the width and height of <buffer>." |
| |
| If EGL_TEXTURE_INTERNAL_FORMAT_ANGLE is specified, it is used to interpret |
| <buffer> according to the provided internal format. See table |
| egl.restrictions for acceptable texture object types and formats. |
| |
| If the EGL_ANGLE_device_d3d extension is present, the provided D3D11 texture |
| object must have been created by the same D3D11 device queried from the |
| display. If these requirements are not met, an EGL_BAD_PARAMETER error is |
| generated." |
| |
| Additions to Chapter 3 of the EGL 1.2 Specification (EGL Functions and Errors) |
| |
| Replace the last sentence of paragraph 1 of Section 3.5.3 with the |
| following text. |
| "Currently, the only client API resources which may be bound in this |
| fashion are OpenVG VGImage objects and Direct3D texture objects." |
| |
| Replace the last sentence of paragraph 2 ("To bind a client API...") of |
| Section 3.5.3 with the following text. |
| "When <buftype> is EGL_OPENVG_IMAGE or EGL_D3D_TEXTURE_ANGLE, the width and |
| height of the pbuffer are determined by the width and height of <buffer>." |
| |
| Replace the third paragraph of Section 3.5.3 with the following text. |
| "<buftype> specifies the type of buffer to be bound. The only allowed values |
| of <buftype> are EGL_OPENVG_IMAGE and EGL_D3D_TEXTURE_ANGLE". |
| |
| Append the following text to the fourth paragraph of Section 3.5.3. |
| "When <buftype> is EGL_D3D_TEXTURE_ANGLE, <buffer> must be |
| a valid D3D texture object, cast into the type EGLClientBuffer. See table |
| egl.restrictions for acceptable texture object types and formats. If the |
| EGL_ANGLE_device_d3d extension is present, the provided D3D texture object |
| must have been created by the same D3D device queried from the display. |
| If these requirements are not met, an EGL_BAD_PARAMETER error is |
| generated." |
| |
| --------------------------------------------------------------------------- |
| Resource Type Resource Restrictions |
| --------------------------------------------------------------------------- |
| IDirect3DTexture9 Memory pool must be D3DPOOL_DEFAULT. |
| |
| Format must be D3DFMT_R8G8B8, D3DFMT_A8R8G8B8, |
| D3DFMT_A16B16G16R16F or D3DFMT_A32B32G32R32F. |
| |
| EGL_TEXTURE_INTERNAL_FORMAT_ANGLE is not supported. |
| |
| ID3D11Texture2D Usage flags must be D3D11_USAGE_DEFAULT. |
| |
| Format must be |
| DXGI_FORMAT_R8G8B8A8_UNORM, |
| DXGI_FORMAT_R8G8B8A8_UNORM_SRGB, |
| DXGI_FORMAT_B8G8R8A8_UNORM, |
| DXGI_FORMAT_B8G8R8A8_UNORM_SRGB (support is optional), |
| DXGI_FORMAT_R8G8B8A8_TYPELESS (support is optional), |
| DXGI_FORMAT_B8G8R8A8_TYPELESS (support is optional), |
| DXGI_FORMAT_R16G16B16A16_FLOAT, |
| DXGI_FORMAT_R32G32B32A32_FLOAT, or |
| DXGI_FORMAT_R10G10B10A2_UNORM. |
| |
| EGL_TEXTURE_INTERNAL_FORMAT_ANGLE (if supported) must be |
| GL_RGBA (supported for all formats), |
| GL_RGB (supported except for DXGI_FORMAT_R10G10B10A2_UNORM), or |
| GL_BGRA_EXT (supported only for |
| DXGI_FORMAT_B8G8R8A8_UNORM, |
| DXGI_FORMAT_B8G8R8A8_UNORM_SRGB, or |
| DXGI_FORMAT_B8G8R8A8_TYPELESS). |
| |
| -------------------------------------------------------------------------- |
| Table egl.restrictions - Restrictions on D3D resources that can be used |
| as a <buffer>. |
| -------------------------------------------------------------------------- |
| |
| Append to the fifth paragraph of Section 3.5.3. |
| "In addition, in case buftype is EGL_D3D_TEXTURE_ANGLE and the D3D resource |
| has a typeless DXGI format, attrib_list may contain the attribute |
| EGL_GL_COLORSPACE." |
| |
| Append to the end of Section 3.5.3. |
| "When a pbuffer is created with type EGL_D3D_TEXTURE_ANGLE, the contents |
| of the associcated D3D texture object are undefined while the pbuffer is |
| the current read surface, draw surface or bound to a client texture." |
| |
| Append to the end of Section 3.5.3. |
| "When a pbuffer is created with type EGL_D3D_TEXTURE_ANGLE, and the |
| EGL_GL_COLORSPACE attribute is not specified in attrib_list, the |
| EGL_GL_COLORSPACE attribute of the surface is determined by the DXGI format |
| of the Direct3D texture. For *_SRGB DXGI formats, the value of |
| EGL_GL_COLORSPACE is EGL_GL_COLORSPACE_SRGB. For other formats including |
| *_TYPELESS DXGI formats, the value of EGL_GL_COLORSPACE defaults to |
| EGL_GL_COLORSPACE_LINEAR." |
| |
| Issues |
| |
| 1. What renderers allow the use of a multi-sampled texture? |
| |
| PROPOSED: Mutli-sampled texture support is currently limited to D3D11. |
| Additionally, the client is responsible for resolving the texture. |
| |
| 2. How does this extension interact with EXT_sRGB_write_control? |
| |
| If GL_FRAMEBUFFER_SRGB_EXT is disabled and a pbuffer created from a D3D |
| texture with an *_SRGB format is being rendered to, it is undefined whether |
| SRGB conversion will be performed. |
| |
| 3. What renderers allow the use of typeless textures? |
| |
| PROPOSED: Support for typeless textures is currently limited to D3D11. |
| |
| 4. Can RGB formats be supported? |
| |
| RESOLVED: RGB internal formats are supported for creating images from D3D11 |
| textures in version 5 by setting EGL_TEXTURE_INTERNAL_FORMAT_ANGLE attribute |
| to GL_RGB. Images with an RGB format will ensure that the alpha channel of |
| the texture is reset to 1.0 when it is used. |
| |
| Revision History |
| |
| Version 5, 2019/09/06 - added support for creating EGLImage. |
| |
| Version 4, 2019/04/15 - added support for DXGI_FORMAT_R10G10B10A2_UNORM. |
| |
| Version 3, 2018/01/23 - added support for typeless textures. |
| |
| Version 2, 2018/01/15 - clarified SRGB conversion handling. |
| |
| Version 1, 2016/10/05 - first draft. |
