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