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Workaround for ICE in the DXC shader compiler in debug builds with an EnvironmentMapLight (#11487)

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# Objective

DXC+DX12 debug builds with an environment map have been broken since
https://github.com/bevyengine/bevy/pull/11366 merged due to an internal
compiler error in DXC. I tracked it down to a single `break` statement
and reported it upstream
(https://github.com/microsoft/DirectXShaderCompiler/issues/6183)

## Solution

Workaround the ICE by setting the for loop index variable to the max
value of the loop to avoid the `break` that's causing the ICE.

This works because it's the last thing in the for loop.

The `reflection_probes` and `pbr` examples both appear to still work
correctly.
This commit is contained in:
Elabajaba 2024-01-27 08:37:08 -05:00 committed by GitHub
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7
crates/bevy_pbr/src/light_probe/environment_map.wgsl
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@ -51,7 +51,12 @@ fn compute_radiances(
if (all(abs(probe_space_pos) <= vec3(0.5))) {
cubemap_index = reflection_probe.cubemap_index;
intensity = reflection_probe.intensity;
break;
// TODO: Workaround for ICE in DXC https://github.com/microsoft/DirectXShaderCompiler/issues/6183
// This works because it's the last thing that happens in the for loop, and will break as soon as it
// goes back to the top of the loop.
// We can't use `break` here because of the ICE.
// break;
reflection_probe_index = light_probes.reflection_probe_count;
}
}