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A comment on macOS 15.8.2 Breaks OpenGL. Parent comment

Re:macOS 15.8.2 Breaks OpenGL by mosura on Sunday October 18, 2026 @12:01PM (#50142241)
Given the comparable performance of OpenGL and Metal on the same hardware I was under the impression that is how Apple had been implementing OpenGL for quite a while.
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Re:macOS 15.8.2 Breaks OpenGL by my123 on Sunday October 18, 2026 @12:03PM (#50142254)
OpenGL on Apple GPUs is implemented on top of Metal with some private extensions to be closer to OpenGL behaviour. Making things work performantly on top of regular Metal is quite a bit harder.
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Re:macOS 15.8.2 Breaks OpenGL by LoganDark on Sunday October 18, 2026 @12:07PM (#50142305)
Not sure why this is downvoted, it's true: https://rosenzweig.io/blog/asahi-gpu-part-6.html

> Comparing traces, the render pass "OpenGL mode" sets an unknown bit in this kernel-processed block. If we set the same bit in our OpenGL driver, we find the clip space changes to -1/1.

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