Add option to enforce fragment execution with side effects in MSL #2324
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Fixes #2322
Metal will incorrectly discard fragments with side effects under certain circumstances prematurely. The conditions are the following:
However, Metal will also discard the fragment even if it has operations with side effects inside the fragment shader before the discard operation.
Vulkan states the graphics pipeline to execute in the following order:
Therefore, we need to enforce fragment shader execution and not let Metal discard the fragment before that for such cases. This change adds an option to provide such utility.