8703db393b
Discard is not always treated as an explicit return and flow control can continue for required derivative calculations. This behaviour is different in Metal vs OpenGL. Adding return after discards ensures consistency in expectation as behaviour is well-defined. Authored by Apple: Michael Parkin-White Ref T96261 Reviewed By: fclem Maniphest Tasks: T96261 Differential Revision: https://developer.blender.org/D17199
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