12a8654784
If this is computed *before* a `demote`, but used *after*, forwarding it will produce the wrong value. This does make for uglier shaders, but it's necessary right now to ensure correctness. I needed to use an assembly shader to produce the test for this. `spirv-opt` is not smart enough (or too smart?) to eliminate the variable that would be used in GLSL to express this. |
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