SPIRV-Cross/reference/opt/shaders-msl/vulkan/frag/demote-to-helper.vk.nocompat.msl23.ios.frag
Chip Davis c7ce92a95b MSL: Manually update BuiltInHelperInvocation when a fragment is discarded.
Some Metal devices have a bug where `simd_is_helper_thread()` won't
return true after a fragment has been discarded. We can work around this
by manually setting `gl_HelperInvocation` upon discarding a fragment.
This is fairly unintrusive, so it is enabled by default. I've made it an
option so that, when the bug is fixed, we can disable it.
2022-11-19 23:48:26 -08:00

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JavaScript

#include <metal_stdlib>
#include <simd/simd.h>
using namespace metal;
fragment void main0()
{
bool gl_HelperInvocation = {};
gl_HelperInvocation = simd_is_helper_thread();
gl_HelperInvocation = true, discard_fragment();
bool _9 = gl_HelperInvocation;
}