kc3-lang/angle/extensions/ANGLE_read_only_depth_stencil_feedback_loops.txt

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• Hash : 6c41793f
  Author :
  Date : 2022-12-20T15:20:50
  

  Vulkan: Use read/write depth/stencil layouts
  
  This allows an application to have depth in read-only feedback loop
  while stencil is being written to for example.
  
  Bug: angleproject:7899
  Bug: b/192477489
  Change-Id: Ic2e11d32da7c7e3a7f3cd86dbafc5c56a0dbbfd7
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4116730
  Reviewed-by: Yuxin Hu <yuxinhu@google.com>
  Reviewed-by: Charlie Lao <cclao@google.com>
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  

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• extensions/ANGLE_read_only_depth_stencil_feedback_loops.txt

• Name
  
      ANGLE_read_only_depth_stencil_feedback_loops
  
  Name Strings
  
      GL_ANGLE_read_only_depth_stencil_feedback_loops
  
  Contributors
  
      Jamie Madill, Google Inc.
      Shahbaz Youssefi, Google Inc.
  
  Contact
  
      Jamie Madill, Google Inc. (jmadill 'at' google 'dot' com)
  
  Status
  
      WIP
  
  Version
  
      Last Modified Date: Dec 22, 2022
      Author Revision: 1
  
  Number
  
      OpenGL ES Extension ###
  
  Dependencies
  
      OpenGL ES 3.0 is required.
  
      The extension is written against the OpenGL ES 3.2 specification.
  
  Overview
  
      This extension allows defined results when reading from a depth or stencil
      texture that is bound as a read-only depth or stencil buffer.
  
  IP Status
  
      No known IP claims.
  
  New Procedures and Functions
  
      None
  
  New Tokens
  
      None
  
  Additions to Chapter 8 of the OpenGL ES 3.2 Specification (Textures and
  Samplers)
  
      Added to the list of conditions in 8.14.2.1 (Rendering Feedback Loops):
  
      "The texture is not a depth texture, or the value of
      DEPTH_WRITEMASK is not FALSE."
  
      "The texture is not a stencil texture, or stencil is not being modified."
  
  Additions to Chapter 9 of the OpenGL ES 3.1 Specification (Framebuffers and
  Framebuffer Objects)
  
      Removed from the end of section in 9.3.1 (Rendering Feedback Loops):
  
      "Also note that even if writing to a given texture is disabled (e.g. via the color,
      depth, or stencil writemasks) during rendering, a feedback loop will still occur."
  
      Added from the end of section in 9.3.1 (Rendering Feedback Loops):
  
      "Note that if writing to a given depth texture is disabled (via the depth
      writemask) during rendering, a feedback loop will not occur.  Additionally,
      if writing to a given stencil texture is disabled (via the stencil mask and ops),
      a feedback loop will not occur."
  
  Errors
  
      None
  
  New State
  
      None
  
  Issues
  
      TBD
  
  Revision History
  
      Revision 2, 2022/12/22
        - Adjust language to exclude read-only stencil from feedback loop
      Revision 1, 2022/05/09
        - Initial revision.
  
  

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