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