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EGL_ANGLE_device_cgl.txt
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EGL_ANGLE_device_cgl.txt
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Name
ANGLE_device_cgl
Name Strings
EGL_ANGLE_device_cgl
Contributors
Ken Russell (kbr 'at' google.com)
Geoff Lang (geofflang 'at' google.com)
Contact
Ken Russell (kbr 'at' google.com)
Status
Draft
Version
Version 1, October 4, 2019
Number
EGL Extension #XXX
Extension Type
EGL device extension
Dependencies
This extension is written against the language of EGL 1.5 as
modified by EGL_EXT_device_query.
EGL_EXT_device_query is required.
Overview
ANGLE on macOS internally uses an OpenGL context allocated via CGL.
This extension defines a mapping from an EGL device to the underlying
CGLContextObj and its associated CGLPixelFormatObj, after it's been
queried from an EGL display.
IP Status
No known claims.
New Types
None.
New Procedures and Functions
None.
New Tokens
Accepted as a queried <attribute> in eglQueryDeviceAttribEXT:
EGL_CGL_CONTEXT_ANGLE 0x3485
EGL_CGL_PIXEL_FORMAT_ANGLE 0x3486
Add a new section 2.1.3 (CGL Devices) after 2.1.2 (Devices)
On macOS the underlying CGLContextObj and CGLPixelFormatObj can be queried
from the EGL device. The intented purpose is to allow applications to create
new CGL contexts which share resources with this one.
Changes to section 3.2 (Devices)
Replace the paragraph immediately following the prototype for
eglQueryDeviceAttribEXT:
<attribute> may be either EGL_CGLCONTEXT_DEVICE_ANGLE or
EGL_CGLPIXELFORMAT_DEVICE_ANGLE. On success, EGL_TRUE is returned, and a
valid CGLContextObj or CGLPixelFormatObj corresponding to the EGL device is
returned in <value>. These objects are compatible with OpenGL and CGL API
functions. If the EGL device is not currently associated with a CGL context,
EGL_BAD_ATTRIBUTE is returned, and <value> is left unchanged.
Issues
None
Revision History
Version 1, October 4, 2019 (Ken Russell)
- Initial Draft
Version 2, October 8, 2019 (Ken Russell)
- Address feedback from Geoff Lang