mirror of
https://mirror.ghproxy.com/https://github.com/dexyfex/CodeWalker
synced 2024-11-17 04:22:54 +08:00
64 lines
2.0 KiB
HLSL
64 lines
2.0 KiB
HLSL
|
Texture2D Input : register( t0 );
|
||
|
|
RWStructuredBuffer<float> Result : register( u0 );
|
||
|
|
|
||
|
|
cbuffer cbCS : register( b0 )
|
||
|
|
{
|
||
|
|
uint4 g_param; // (g_param.x, g_param.y) is the x and y dimensions of the Dispatch call
|
||
|
|
// (g_param.z, g_param.w) is the size of the above Input Texture2D
|
||
|
|
};
|
||
|
|
|
||
|
|
//#define CS_FULL_PIXEL_REDUCTION // Defining this or not must be the same as in PostProcessor....
|
||
|
|
|
||
|
|
#define blocksize 8
|
||
|
|
#define blocksizeY 8
|
||
|
|
#define groupthreads (blocksize*blocksizeY)
|
||
|
|
groupshared float accum[groupthreads];
|
||
|
|
|
||
|
|
static const float4 LUM_VECTOR = float4(.299, .587, .114, 0);
|
||
|
|
|
||
|
|
[numthreads(blocksize,blocksizeY,1)]
|
||
|
|
void main( uint3 Gid : SV_GroupID, uint3 DTid : SV_DispatchThreadID, uint3 GTid : SV_GroupThreadID, uint GI : SV_GroupIndex )
|
||
|
|
{
|
||
|
|
float4 s =
|
||
|
|
#ifdef CS_FULL_PIXEL_REDUCTION
|
||
|
|
Input.Load( uint3(DTid.xy , 0) )+
|
||
|
|
Input.Load( uint3(DTid.xy + uint2(blocksize*g_param.x, 0), 0) ) +
|
||
|
|
Input.Load( uint3(DTid.xy + uint2(0, blocksizeY*g_param.y), 0) ) +
|
||
|
|
Input.Load( uint3(DTid.xy + uint2(blocksize*g_param.x, blocksizeY*g_param.y), 0) );
|
||
|
|
#else
|
||
|
|
Input.Load( uint3((float)DTid.x/81.0f*g_param.z, (float)DTid.y/81.0f*g_param.w, 0) );
|
||
|
|
#endif
|
||
|
|
|
||
|
|
accum[GI] = dot( s, LUM_VECTOR );
|
||
|
|
|
||
|
|
// Parallel reduction algorithm follows
|
||
|
|
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.y*g_param.x+Gid.x] = accum[0];
|
||
|
|
}
|
||
|
|
}
|