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Created by Robert Mader@rmader

Expose OES_EGL_image_external and OES_EGL_image_external_essl3 extensions in GL core profile

Currently the GL core profile exposes the GL_OES_EGL_image, but not GL_OES_EGL_image_external and GL_OES_EGL_image_external_essl3. In some situations, especially when dealing with DMABUFs, they can be quite handy and there seems to be no equivalent in desktop GL. Update: see #2119 (comment 315982)

Potentially all three should then get exported as GL_ARB instead of GL_OES.

Experimental untested patch: https://gist.githubusercontent.com/karolherbst/111946258289d29595bb037dda724685/raw/8e35a050154ffcaf0dccfedd454a79abe3c35d8d/image_external.patch

Edited by Robert Mader
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