Map SV_InstanceID to gl_InstanceIndex-gl_BaseInstance
#6468
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jkwak-work
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Feb 28, 2025
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yes, this is needed to silence another related error in latest vs.
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Closes #6457.
This PR adds a new mechanism to represent builtin GLSL/SPIRV variables in Slang IR, by decorating a global variable with the
IRTargetBuiltinVarDecoration. This new mechanism is used to represent SV_Instance, gl_InstanceIndex and gl_BaseInstance.In a follow up PR, we will refactor the existing builtin variable implementation in GLSL/SPIRV legalization to use IRTargetBuiltinVarDecoration instead of relying on the SystemSemanticAttr. The refactor is not done in thie PR to keep the change small and focused.