kc3-lang/angle/extensions/EGL_ANGLE_power_preference.txt

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• Hash : 51386f4a
  Author :
  Date : 2019-04-11T21:55:20
  

  Reland "Define and expose EGL_ANGLE_power_preference extension."
  
  This is a reland of ac58e63295f093b7518535bdd060ff832025b0c5
  
  The original CL was reverted in a rush because I thought there was an
  uninitialized variable bug, but upon later re-review this turned out to
  not be the case.
  
  Original change's description:
  > Define and expose EGL_ANGLE_power_preference extension.
  >
  > Allows application to select the integrated or discrete GPU on
  > dual-GPU macOS systems.
  >
  > Tested by modifying the example program at:
  > https://github.com/grorg/ANGLEIOSurfaceTest
  >
  > and verifying that both integrated and discrete GPUs can be selected.
  > (The changes to that program will be upstreamed once some build issues
  > are resolved.)
  >
  > Bug: 2813
  > Change-Id: Ibeb17778512896456d220e9bc4cf8f222aa57057
  > Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1570081
  > Commit-Queue: Kenneth Russell <kbr@chromium.org>
  > Reviewed-by: Geoff Lang <geofflang@chromium.org>
  
  Bug: 2813
  Tbr: geofflang@chromium.org
  Tbr: cwallez@chromium.org
  Change-Id: Iea000dd718f4f4b4f57237adb1dc44381b10106b
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1575419
  Reviewed-by: Kenneth Russell <kbr@chromium.org>
  Commit-Queue: Kenneth Russell <kbr@chromium.org>
  

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• extensions/EGL_ANGLE_power_preference.txt

• Name
  
      ANGLE_power_preference
  
  Name Strings
  
      EGL_ANGLE_power_preference
  
  Contributors
  
      Kenneth Russell
  
  Contacts
  
      Kenneth Russell, Google Inc. (kbr 'at' google.com)
  
  Status
  
      Draft
  
  Version
  
      Version 1, April 16, 2019
  
  Number
  
      EGL Extension #??
  
  Dependencies
  
      This extension is written against the wording of the EGL 1.4
      Specification.
  
  Overview
  
      This extension allows selection of the high- or low-power GPU on
      dual-GPU systems, specifically on macOS.
  
  New Types
  
      None
  
  New Procedures and Functions
  
      None
  
  New Tokens
  
      Accepted as an attribute name in the <*attrib_list> argument to
      eglCreateContext:
  
          EGL_POWER_PREFERENCE_ANGLE  0x3482
  
      Accepted as an attribute value in the <*attrib_list> argument to
      eglCreateContext:
  
          EGL_LOW_POWER_ANGLE         0x0001
          EGL_HIGH_POWER_ANGLE        0x0002
  
  Additions to the EGL 1.4 Specification
  
      Add the following to section 3.7.1 "Creating Rendering Contexts":
  
      EGL_POWER_PREFERENCE_ANGLE indicates whether the context should be
      created on the integrated (low-power) or discrete (high-power) GPU
      on dual-GPU systems. EGL_POWER_PREFERENCE_ANGLE is only a legal
      context creation attribute when the EGL_ANGLE_power_preference
      extension is advertised. The valid values for this attribute are
      EGL_LOW_POWER_ANGLE and EGL_HIGH_POWER_ANGLE. If this extension is
      advertised and this context creation attribute is not specified,
      the default value is EGL_LOW_POWER_ANGLE.
  
      The containing application must set the
      NSSupportsAutomaticGraphicsSwitching attribute to true in its
      Info.plist in order for this extension to operate as advertised.
  
  Issues
  
      None yet.
  
  Revision History
  
      Rev.    Date         Author     Changes
      ----  -------------  ---------  ----------------------------------------
        1   Apr 16, 2019   kbr        Initial version
  

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