39 lines
950 B
HLSL
39 lines
950 B
HLSL
// Copyright Epic Games, Inc. All Rights Reserved.
|
|
|
|
#include "../Common.ush"
|
|
#include "PathTracingAdaptiveUtils.ush"
|
|
|
|
|
|
RWBuffer<uint> NextActivePaths;
|
|
RWBuffer<uint> NumPathStates;
|
|
int2 TileTextureOffset;
|
|
uint2 DispatchDim;
|
|
|
|
|
|
[numthreads(THREADGROUPSIZE_X, THREADGROUPSIZE_Y, 1)]
|
|
void PathTracingAdaptiveStartCS(uint2 DispatchThreadId : SV_DispatchThreadID)
|
|
{
|
|
uint2 DispatchIdx = DispatchThreadId;
|
|
if (any(DispatchIdx >= DispatchDim))
|
|
{
|
|
return;
|
|
}
|
|
|
|
uint PathIndex = DispatchIdx.x + 65536 * DispatchIdx.y;
|
|
if (PathIndex == 0)
|
|
{
|
|
// write other dimensions for indirect dispatch
|
|
NumPathStates[1] = 1;
|
|
NumPathStates[2] = 1;
|
|
}
|
|
|
|
float SampleScaleFactor = GetAdaptiveSampleFactor(DispatchIdx + TileTextureOffset);
|
|
if (SampleScaleFactor > 1.0)
|
|
{
|
|
// This pixel needs more samples, allocate a path state for it
|
|
uint PathStateIndex;
|
|
InterlockedAdd(NumPathStates[0], 1, PathStateIndex);
|
|
NextActivePaths[PathStateIndex] = PathIndex;
|
|
}
|
|
}
|