kc3-lang/angle/extensions/ANGLE_rgbx_internal_format.txt

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• Hash : df946856
  Author :
  Date : 2022-08-22T20:36:52
  

  Map RGBX AHB to GL_RGBX8_ANGLE and fix the load function
  
  AHARDWAREBUFFER_FORMAT_R8G8B8X8_UNORM was false mapped to GL_RGB8, which
  will write back to the backing exteranl storage with 3 channel layout.
  Angle actually has ANGLE_rgbx_internal_format to fix the mapping with
  GL_RGBX8_ANGLE. However, the load function must align with GL_RGB8 if
  the actual storage is 4 channel. This change also fixes that to use
  LoadToNative3To4<GLubyte, 0xFF>.
  
  Bug: b/238460927
  Test: CtsNativeHardwareTestCases#SingleLayer_ColorTest_*_R8G8B8X8_*
  Test: ImageTestES3.RGBXAHB* pass without VVL error
  Change-Id: Ic5db4cb4adba252949d64e560ff32e492a045912
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3846413
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Lingfeng Yang <lfy@google.com>
  

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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
  
  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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