058f1a0933
This maps them to their MSL equivalents. I've mapped `Coherent` to `volatile` since MSL doesn't have anything weaker than `volatile` but stronger than nothing. As part of this, I had to remove the implicit `volatile` added for atomic operation casts. If the buffer is already `coherent` or `volatile`, then we would add a second `volatile`, which would be redundant. I think this is OK even when the buffer *doesn't* have `coherent`: `T *` is implicitly convertible to `volatile T *`, but not vice-versa. It seems to compile OK at any rate. (Note that the non-`volatile` overloads of the atomic functions documented in the spec aren't present in the MSL 2.2 stdlib headers.) `restrict` is tricky, because in MSL, as in C++, it needs to go *after* the asterisk or ampersand for the pointer type it's modifying. Another issue is that, in the `Simple`, `GLSL450`, and `Vulkan` memory models, `Restrict` is the default (i.e. does not need to be specified); but MSL likely follows the `OpenCL` model where `Aliased` is the default. We probably need to implicitly set either `Restrict` or `Aliased` depending on the module's declared memory model.
27 lines
784 B
Plaintext
27 lines
784 B
Plaintext
#pragma clang diagnostic ignored "-Wmissing-prototypes"
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#pragma clang diagnostic ignored "-Wunused-variable"
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#include <metal_stdlib>
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#include <simd/simd.h>
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#include <metal_atomic>
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using namespace metal;
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struct u0_counters
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{
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uint c;
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};
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// Returns 2D texture coords corresponding to 1D texel buffer coords
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uint2 spvTexelBufferCoord(uint tc)
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{
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return uint2(tc % 4096, tc / 4096);
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}
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kernel void main0(device u0_counters& u0_counter [[buffer(0)]], texture2d<uint, access::write> u0 [[texture(0)]], uint3 gl_GlobalInvocationID [[thread_position_in_grid]])
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{
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uint _29 = atomic_fetch_sub_explicit((device atomic_uint*)&u0_counter.c, 1, memory_order_relaxed);
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u0.write(uint4(uint(int(gl_GlobalInvocationID.x))), spvTexelBufferCoord(as_type<int>(as_type<float>(_29))));
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}
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