mirror of
https://mirror.ghproxy.com/https://github.com/dexyfex/CodeWalker
synced 2024-11-05 22:57:25 +08:00
55 lines
1.4 KiB
HLSL
55 lines
1.4 KiB
HLSL
StructuredBuffer<float> Input : register( t0 );
|
|
RWStructuredBuffer<float> Result : register( u0 );
|
|
|
|
cbuffer cbCS : register( b0 )
|
|
{
|
|
uint4 g_param; // g_param.x is the actual elements contained in Input
|
|
// g_param.y is the x dimension of the Dispatch call
|
|
};
|
|
|
|
#define groupthreads 128
|
|
groupshared float accum[groupthreads];
|
|
|
|
[numthreads(groupthreads,1,1)]
|
|
void main( uint3 Gid : SV_GroupID, uint3 DTid : SV_DispatchThreadID, uint3 GTid : SV_GroupThreadID, uint GI : SV_GroupIndex )
|
|
{
|
|
if ( DTid.x < g_param.x )
|
|
accum[GI] = Input[DTid.x];
|
|
else
|
|
accum[GI] = 0;
|
|
|
|
// Parallel reduction algorithm follows
|
|
GroupMemoryBarrierWithGroupSync();
|
|
if ( GI < 64 )
|
|
accum[GI] += accum[64+GI];
|
|
|
|
GroupMemoryBarrierWithGroupSync();
|
|
if ( GI < 32 )
|
|
accum[GI] += accum[32+GI];
|
|
|
|
GroupMemoryBarrierWithGroupSync();
|
|
if ( GI < 16 )
|
|
accum[GI] += accum[16+GI];
|
|
|
|
GroupMemoryBarrierWithGroupSync();
|
|
if ( GI < 8 )
|
|
accum[GI] += accum[8+GI];
|
|
|
|
GroupMemoryBarrierWithGroupSync();
|
|
if ( GI < 4 )
|
|
accum[GI] += accum[4+GI];
|
|
|
|
GroupMemoryBarrierWithGroupSync();
|
|
if ( GI < 2 )
|
|
accum[GI] += accum[2+GI];
|
|
|
|
GroupMemoryBarrierWithGroupSync();
|
|
if ( GI < 1 )
|
|
accum[GI] += accum[1+GI];
|
|
|
|
if ( GI == 0 )
|
|
{
|
|
Result[Gid.x] = accum[0];
|
|
}
|
|
}
|