SPIRV-Cross/samples/cpp/shared.comp
2021-06-29 11:03:38 +02:00

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// Copyright 2016-2021 The Khronos Group Inc.
// SPDX-License-Identifier: Apache-2.0
#version 310 es
layout(local_size_x = 64) in;
layout(set = 0, binding = 0, std430) readonly buffer SSBO0
{
float inputs[];
};
layout(set = 0, binding = 1, std430) writeonly buffer SSBO1
{
float outputs[];
};
shared float tmp[gl_WorkGroupSize.x];
void main()
{
uint local = gl_LocalInvocationIndex;
uint work_group = gl_WorkGroupID.x;
// Does a trivial parallel reduction through shared memory.
tmp[local] = inputs[work_group * gl_WorkGroupSize.x * 2u + local] + inputs[work_group * gl_WorkGroupSize.x * 2u + local + gl_WorkGroupSize.x];
memoryBarrierShared();
barrier();
for (uint limit = 32u; limit > 1u; limit >>= 1u)
{
if (local < limit)
tmp[local] = tmp[local] + tmp[local + limit];
memoryBarrierShared();
barrier();
}
if (local == 0u)
outputs[work_group] = tmp[0] + tmp[1];
}