66 lines
1.2 KiB
Plaintext
66 lines
1.2 KiB
Plaintext
#version 450
|
|
|
|
/* built in:
|
|
in uvec3 gl_NumWorkGroups;
|
|
in uvec3 gl_WorkGroupID;
|
|
in uvec3 gl_LocalInvocationID;
|
|
in uvec3 gl_GlobalInvocationID;
|
|
in uint gl_LocalInvocationIndex;
|
|
*/
|
|
layout(local_size_x_id = 0, local_size_y = 1, local_size_z = 1) in;
|
|
|
|
layout(push_constant) uniform PushStruct
|
|
{
|
|
uint offset;
|
|
}
|
|
p;
|
|
|
|
layout(binding = 0) buffer inBuffer
|
|
{
|
|
uint v[];
|
|
};
|
|
layout(binding = 1) buffer outBuffer
|
|
{
|
|
uint g_v[];
|
|
};
|
|
|
|
// TODO: Shared variables
|
|
// 512 Elements but initial reduction is done
|
|
const uint bufferSize = 256;
|
|
shared uint[bufferSize] localBuffer;
|
|
|
|
void main()
|
|
{
|
|
uint tid = gl_LocalInvocationID.x;
|
|
uint gid = gl_WorkGroupID.x;
|
|
uint offset = gid * bufferSize;
|
|
|
|
uint idx1 = offset + tid;
|
|
uint idx2 = offset + tid + gl_WorkGroupSize.x;
|
|
|
|
uint val1 = 0;
|
|
uint val2 = 0;
|
|
|
|
if (idx1 < p.offset)
|
|
val1 = v[idx1];
|
|
if (idx2 < p.offset)
|
|
val2 = v[idx2];
|
|
|
|
localBuffer[tid] = val1 + val2;
|
|
|
|
// Reduction in shared memory
|
|
for (uint s = gl_WorkGroupSize.x / 2; s > 0; s /= 2)
|
|
{
|
|
if (tid < s)
|
|
{
|
|
barrier();
|
|
localBuffer[tid] += localBuffer[tid + s];
|
|
}
|
|
}
|
|
|
|
if (tid == 0)
|
|
{
|
|
g_v[gid] = localBuffer[tid];
|
|
}
|
|
}
|