kc3-lang/angle/extensions/ANGLE_base_vertex_base_instance_shader_builtin.txt

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  Commit

• Hash : f64f9546
  Author :
  Date : 2021-12-07T20:17:32
  

  Reland "Decouple gl_BaseVertex/gl_BaseInstance uniforms"
  
  This reverts commit 10e5f34d1439f0bcd5b30bea5bfbf6bdaafd4935.
  
  Reason for revert: exonerated from flaky crash suspect
  
  Original change's description:
  > Revert "Decouple gl_BaseVertex/gl_BaseInstance uniforms"
  >
  > This reverts commit 36bf1ebe5e9500704dd235254bd22a1f2bbd7059.
  >
  > Reason for revert: suspect causing flaky crashes
  >
  > Bug: angleproject:6763
  >
  > Original change's description:
  > > Decouple gl_BaseVertex/gl_BaseInstance uniforms
  > >
  > > These are builtin uniforms removed in
  > > https://github.com/KhronosGroup/WebGL/pull/3278
  > >
  > > Decouple them from the original ANGLE_base_vertex_base_instance
  > > extension.
  > >
  > > Make a new ANGLE_base_vertex_base_instance_shader_builtin
  > > extension for these builtin uniforms.
  > >
  > > Bug: angleproject:3402
  > > Change-Id: I77b93917976ce435db9c578c0ade37bff18a42b0
  > > Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3290304
  > > Commit-Queue: Shrek Shao <shrekshao@google.com>
  > > Reviewed-by: Geoff Lang <geofflang@chromium.org>
  > > Reviewed-by: Kenneth Russell <kbr@chromium.org>
  >
  > Bug: angleproject:3402
  > Change-Id: I75830baa14cf4e7c53750fd14ff76501145b4823
  > Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3315610
  > Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
  > Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
  > Reviewed-by: Kenneth Russell <kbr@chromium.org>
  > Commit-Queue: Shrek Shao <shrekshao@google.com>
  
  Bug: angleproject:6763
  Bug: angleproject:3402
  Change-Id: Ie436dc5d55364e464897d407a53b793941cd5d0b
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3321703
  Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
  Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
  

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• extensions/ANGLE_base_vertex_base_instance_shader_builtin.txt

• Name
  
      ANGLE_base_vertex_base_instance_shader_builtin
  
  Name Strings
  
      GL_ANGLE_base_vertex_base_instance_shader_builtin
  
  Contributors
  
      Shrek Shao, Google Inc.
      Contributors to the ANGLE_base_vertex_base_instance specification
      Contributors to the ARB_shader_draw_parameters specification
  
  Contact
  
      Shrek Shao (shrekshao 'at' google.com)
  
  Status
  
      Incomplete
  
  Version
  
      Last Modified Date: Nov 19, 2021
      Author Revision: 1
  
  Number
  
      OpenGL ES Extension XX
  
  Dependencies
  
      The extension is based on ANGLE_base_vertex_base_instance, all limitations of which
      apply to this extension.
  
  Overview
  
      This extension is based on ANGLE_base_vertex_base_instance. It should be enabled
      only if ANGLE_base_vertex_base_instance is enabled.
  
      Additional to the functionality exposed by ANGLE_base_vertex_base_instance,
      <gl_BaseVertex> and <gl_BaseInstance> builtins are added to the shading language.
      For any *BaseVertex* draw call variant, the <baseVertex> of the draw may be
      read by the vertex shader as <gl_BaseVertex>. For non *BaseVertex* calls,
      the value of <gl_BaseVertex> is 0.
      For any *BaseInstance draw call variant, the baseInstance of the draw may
      be read by the vertex shader as <gl_BaseInstance>. For non *BaseInstance
      calls, the value of <gl_BaseInstance> is 0.
  
  IP Status
  
      No known IP claims.
  
  New Procedures and Functions
  
      None.
  
  New Tokens
  
      None.
  
  Additions to Chapter 10 of the OpenGL ES 3.2 Specification
  
      Section 10.5 Drawing Commands Using Vertex Arrays:
  
      The base index of the instance may be read by a vertex shader as
      <gl_BaseInstance>, for the commands
  
      void DrawArraysInstancedBaseInstanceANGLE (GLenum mode,
          GLint first,
          GLsizei count,
          GLsizei instanceCount,
          GLuint baseInstance);
  
      and
  
      void MultiDrawArraysInstancedBaseInstanceANGLE(GLenum mode,
          const GLint* firsts,
          const GLsizei* counts,
          const GLsizei* instanceCounts,
          const GLuint* baseInstances,
          GLsizei drawcount);
  
      The base index of the vertex may be read by a vertex shader as
      <gl_BaseVertex>. This value is also added to the <gl_VertexID>.
  
      The base index of the instance may be read by a vertex shader as
      <gl_BaseInstance>. Note that this value is not added to the
      <gl_InstanceID>, for the commands
  
      void DrawElementsInstancedBaseVertexBaseInstanceANGLE (GLenum mode,
          GLsizei count,
          GLenum type,
          const GLvoid* indices,
          GLsizei instanceCount,
          GLint baseVertex,
          GLuint baseInstance);
  
      and
  
      void MultiDrawElementsInstancedBaseVertexBaseInstanceANGLE(GLenum mode,
          const GLsizei* counts,
          GLenum type,
          const GLvoid* const* indices,
          const GLsizei* instanceCounts,
          const GLint* baseVertices,
          const GLuint* baseInstances,
          GLsizei drawcount);
  
  Errors
  
      None.
  
  Modifications to the OpenGL ES Shading Language Specification, Version 3.00
  
      Including the following line in a shader controls the
      language featured described in this extension:
  
        #extension GL_ANGLE_base_vertex_base_instance_shader_builtin : <behavior>
  
      where <behavior> is as specified in section 3.5.
  
      A new preprocessor #define is added to the OpenGL ES Shading Language:
  
        #define GL_ANGLE_base_vertex_base_instance_shader_builtin 1
  
  
  Issues
  
      None
  
  Revision History
  
      Rev.    Date    Author       Changes
      ----  --------  ----------   --------------------------------------------
      1     11/19/21   Shrek Shao   First revision.
  

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