Ben Clayton f47887d207 tint/writer/msl: Generate an array<T,N> helper
And remove the WrapArraysInStructs transform.

Wrapping arrays in structures becomes troublesome for `const` arrays, as
currently WGSL does not allow `const` structures.

MSL 2.0+ has a builtin array<> helper, but we're targetting MSL 1.2, so
we have to emit our own. Fortunately, it can be done with a few lines of
templated code.

This produces significantly cleaner output.

Change-Id: Ifc92ef21e09befa252a07c856c4b5afdc51cc2e4
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/94540
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Ben Clayton <bclayton@chromium.org>
Reviewed-by: David Neto <dneto@google.com>
2022-06-24 17:01:59 +00:00

23 lines
470 B
HLSL

groupshared int zero[3];
struct tint_symbol_1 {
uint local_invocation_index : SV_GroupIndex;
};
void main_inner(uint local_invocation_index) {
{
[loop] for(uint idx = local_invocation_index; (idx < 3u); idx = (idx + 1u)) {
const uint i = idx;
zero[i] = 0;
}
}
GroupMemoryBarrierWithGroupSync();
int v[3] = zero;
}
[numthreads(1, 1, 1)]
void main(tint_symbol_1 tint_symbol) {
main_inner(tint_symbol.local_invocation_index);
return;
}