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