kc3-lang/angle/extensions/ANGLE_webgl_compatibility.txt

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• Author : James Darpinian
  Date : 2019-10-03 13:46:28
  Hash : 27db2458
  Message : Optimize disabling ARB_texture_rectangle In https://crrev.com/c/1838418 I added the ability to disable ARB_texture_rectangle so that we can use it in the WebGL implementation but disable it when compiling user shaders. Unfortunately disabling and re-enabling the extension causes the shader translator to be reinitialized which turns out to be more expensive than the actual work of shader translation, at least for small shaders. It's slow enough to cause timeouts in WebKit's WebGL conformance test runs. This introduces an alternate method of disabling ARB_texture_rectangle in the translator which is much faster because it avoids reinitializing the translator. Bug: angleproject:3956 Change-Id: I5d31b683ff19a59bdfd289cfd3c609f64ef5e25b Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1991969 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: James Darpinian <jdarpinian@chromium.org>

• extensions/ANGLE_webgl_compatibility.txt

• Name
  
      ANGLE_webgl_compatibility
  
  Name Strings
  
      GL_ANGLE_webgl_compatibility
  
  Contributors
  
      Geoff Lang
      James Darpinian
  
  Contact
  
      Geoff Lang (geofflang 'at' google.com)
  
  Notice
  
      Copyright (c) 2016 The Khronos Group Inc. Copyright terms at
          http://www.khronos.org/registry/speccopyright.html
  
  Status
  
      Draft
  
  Version
  
      Version 3, October 3, 2019
  
  Number
  
      OpenGL ES Extension #??
  
  Dependencies
  
      Requires OpenGL ES 2.0
  
      Written against the OpenGL ES 2.0 specification.
  
      Interacts with EGL_ANGLE_create_context_webgl_compatibility (or equivalent)
      extension.
  
      Interacts with the ARB_texture_rectangle/ANGLE_texture_rectangle extension.
  
  Overview
  
      With this extension enabled, the OpenGL ES context will have additional
      features and validation to be compatible with the WebGL specification.
  
  New Procedures and Functions
  
      None
  
  
  New Tokens
  
      None
  
  Additions to the OpenGL ES Specification
  
      Additional validation will be performed according to the the sections of
      the WebGL specification entitled "Differences Between WebGL and OpenGL ES
      2.0" and "Differences Between WebGL and OpenGL ES 3.0".
  
      When the ANGLE_texture_rectangle extension is supported then Enable,
      Disable, and IsEnabled accept the symbolic constant
      TEXTURE_RECTANGLE_ANGLE, which controls whether ARB_texture_rectangle is
      allowed to be used by shaders at compilation time. This is initially
      enabled. WebGL implementations may want to use ARB_texture_rectangle when
      compiling their own shaders but not expose the extension to WebGL user
      shaders. This only affects shader compilation and not any other part of
      the ANGLE_texture_rectangle extension, nor the behavior of already
      compiled shaders.
  
  New State
  
      None
  
  Conformance Tests
  
      TBD
  
  Issues
  
      None
  
  Revision History
  
      Rev.    Date         Author     Changes
      ----  -------------  ---------  ----------------------------------------
        1   Sept 16, 2016  geofflang  Initial version
        2    Nov 28, 2016  geofflang  Break the extension requests into a
                                      separate extension.
        3     Oct 3, 2019  jdarpinian Allow disabling ARB_texture_rectangle