kc3-lang/angle/extensions/ANGLE_rgbx_internal_format.txt

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• Hash : f8c8264a
  Author :
  Date : 2025-09-17T10:01:22
  

  Support RGBX format with GL_RGBA when using glTexSubImage2D
  
  Add an additional combination support with GL_RGBA in glTexSubImage2D
  for RGBX format.
  
  Add an end2end test.
  
  Bug: angleproject:444335354
  Change-Id: I96fc9d3543fc58c9f666bf149f78cf9049758a32
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6938945
  Reviewed-by: Charlie Lao <cclao@google.com>
  Auto-Submit: Aurora Zhang <Aurora.Zhang@arm.com>
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  

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• extensions/ANGLE_rgbx_internal_format.txt

• Name
  
      ANGLE_rgbx_internal_format
  
  Name Strings
  
      GL_ANGLE_rgbx_internal_format
  
  Contributors
  
      Tim Van Patten, Google
  
  Contacts
  
      Tim Van Patten, Google (timvp 'at' google 'dot' com)
  
  Notice
  
      Copyright (c) 2021 The Khronos Group Inc. Copyright terms at
          http://www.khronos.org/registry/speccopyright.html
  
  Status
  
      Draft.
  
  Version
  
      Version 1, November 22, 2021
  
  Number
  
      OpenGL ES Extension ###
  
  Dependencies
  
      OpenGL ES 2.0 is required.
  
  Overview
  
      This extension introduces a sized internal RGBX format. This is a 32-bit representation of the
      24-bit RGB format, with the Alpha channel ignored.
  
      glBlitFramebuffer() will treat RGBX8 as RGB8 when validating the formats for the READ and DRAW
      framebuffers match, since the X channel is ignored.
  
      glReadPixels() will accept the following format+type combinations:
          1. format = GL_RGBX8_ANGLE, type = GL_UNSIGNED_BYTE
  
      glTexSubImage* will accept the following format+type combinations:
          1. format = GL_RGB, type = GL_UNSIGNED_BYTE
          2. format = GL_RGBA, type = GL_UNSIGNED_BYTE
  
  New Types
  
      None.
  
  New Procedures and Functions
  
      None.
  
  New Tokens
  
      // 32-bit RGBX format
      GL_RGBX8_ANGLE                    0x96BA
  
  Issues
  
      None.
  
  Revision History
  
      #1 - (November 22, 2021) Tim Van Patten
           Original draft
  

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