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PojavLauncherTeam
GitHub Repository: PojavLauncherTeam/angle
 Path: blob/main_old/extensions/EGL_ANGLE_device_cgl.txt
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Name

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    ANGLE_device_cgl

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Name Strings

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    EGL_ANGLE_device_cgl

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Contributors

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    Ken Russell   (kbr 'at' google.com)

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    Geoff Lang    (geofflang 'at' google.com)

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Contact

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    Ken Russell   (kbr 'at' google.com)

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Status

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    Draft

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Version

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    Version 1, October 4, 2019

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Number

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    EGL Extension #XXX

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Extension Type

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    EGL device extension

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Dependencies

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    This extension is written against the language of EGL 1.5 as

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    modified by EGL_EXT_device_query.

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    EGL_EXT_device_query is required.

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Overview

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    ANGLE on macOS internally uses an OpenGL context allocated via CGL.

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    This extension defines a mapping from an EGL device to the underlying

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    CGLContextObj and its associated CGLPixelFormatObj, after it's been

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    queried from an EGL display.

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IP Status

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    No known claims.

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New Types

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    None.

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New Procedures and Functions

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    None.

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New Tokens

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    Accepted as a queried <attribute> in eglQueryDeviceAttribEXT:

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        EGL_CGL_CONTEXT_ANGLE           0x3485

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        EGL_CGL_PIXEL_FORMAT_ANGLE      0x3486

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Add a new section 2.1.3 (CGL Devices) after 2.1.2 (Devices)

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    On macOS the underlying CGLContextObj and CGLPixelFormatObj can be queried

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    from the EGL device. The intented purpose is to allow applications to create

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    new CGL contexts which share resources with this one.

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Changes to section 3.2 (Devices)

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    Replace the paragraph immediately following the prototype for

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    eglQueryDeviceAttribEXT:

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    <attribute> may be either EGL_CGLCONTEXT_DEVICE_ANGLE or

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    EGL_CGLPIXELFORMAT_DEVICE_ANGLE.  On success, EGL_TRUE is returned, and a

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    valid CGLContextObj or CGLPixelFormatObj corresponding to the EGL device is

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    returned in <value>. These objects are compatible with OpenGL and CGL API

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    functions. If the EGL device is not currently associated with a CGL context,

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    EGL_BAD_ATTRIBUTE is returned, and <value> is left unchanged.

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Issues

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    None

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Revision History

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    Version 1, October 4, 2019 (Ken Russell)

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        - Initial Draft

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    Version 2, October 8, 2019 (Ken Russell)

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        - Address feedback from Geoff Lang

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