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GPU: Clarify InstanceIndex / VertexIndex builtin behavior wrt. first_instance / first_vertex / vertex_offset? #10852

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rabbit-ecl opened this issue Sep 15, 2024 · 0 comments · Fixed by #11706
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GPU: Clarify InstanceIndex / VertexIndex builtin behavior wrt. first_instance / first_vertex / vertex_offset? #10852

rabbit-ecl opened this issue Sep 15, 2024 · 0 comments · Fixed by #11706
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rabbit-ecl commented Sep 15, 2024 •
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SDL_GPU can't solve the "works on my machine" problem, but it can at least explain to users exactly why they can't rely on these builtins w/ first_instance & friends and what the platform behavior is. There's no doubt going to be people asking "but why?" so might as well pre-empt that with a doc comment.
See: gpuweb/gpuweb#901
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gpu: Document why VertexID/InstanceID builtins are unreliable flibitijibibo/SDL
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@flibitijibibo @slouken @rabbit-ecl