2017-11-06 02:34:42 +00:00
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#include <metal_stdlib>
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#include <simd/simd.h>
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using namespace metal;
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struct SSBO
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{
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int4 value;
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};
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2019-09-18 19:56:51 +00:00
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constant uint3 gl_WorkGroupSize [[maybe_unused]] = uint3(1u);
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MSL: Handle coherent, volatile, and restrict.
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.
2019-07-10 16:17:40 +00:00
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kernel void main0(volatile device SSBO& _10 [[buffer(0)]], texture2d<int> uImage [[texture(0)]])
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2017-11-06 02:34:42 +00:00
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{
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_10.value = uImage.read(uint2(int2(10)));
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}
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