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.
12 lines
160 B
JavaScript
12 lines
160 B
JavaScript
#include <metal_stdlib>
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#include <simd/simd.h>
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using namespace metal;
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fragment void main0()
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{
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bool _9 = simd_is_helper_thread();
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bool helper = _9;
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}
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