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//TEST:COMPARE_HLSL: -target dxbc-assembly -profile cs_4_0 -entry CSMain
//-----------------------------------------------------------------------------
// File: ReduceToSingleCS.hlsl
//
// Desc: Reduce an input buffer by a factor of groupthreads
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
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 CSMain( 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];
}
}
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