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Optimize DDGI probes position calculation when sampling irradiance

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This commit is contained in:
Wojciech Figat
2022-06-03 16:11:46 +02:00
parent 54c322da7c
commit befaf65ab1
1 changed files with 6 additions and 6 deletions
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12
Source/Shaders/GI/DDGI.hlsl
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@@ -140,14 +140,15 @@ float3 SampleDDGIIrradiance(DDGIData data, Texture2D<float4> probesState, Textur
uint probeIndex = GetDDGIScrollingProbeIndex(data, probeCoords);
// Load probe position and state
float4 probePositionAndState = LoadDDGIProbePositionAndState(data, probesState, probeIndex, probeCoords);
if (probePositionAndState.w == DDGI_PROBE_STATE_INACTIVE)
float4 probeState = probesState.Load(int3(GetDDGIProbeTexelCoords(data, probeIndex), 0));
if (probeState.w == DDGI_PROBE_STATE_INACTIVE)
continue;
float3 probePosition = baseProbeWorldPosition + ((probeCoords - baseProbeCoords) * data.ProbesSpacing) + probeState.xyz;
// Calculate the distance and direction from the (biased and non-biased) shading point and the probe
float3 worldPosToProbe = normalize(probePositionAndState.xyz - worldPosition);
float3 biasedPosToProbe = normalize(probePositionAndState.xyz - biasedWorldPosition);
float biasedPosToProbeDist = length(probePositionAndState.xyz - biasedWorldPosition);
float3 worldPosToProbe = normalize(probePosition.xyz - worldPosition);
float3 biasedPosToProbe = normalize(probePosition.xyz - biasedWorldPosition);
float biasedPosToProbeDist = length(probePosition.xyz - biasedWorldPosition);
// Smooth backface test
float weight = Square(dot(worldPosToProbe, worldNormal) * 0.5f + 0.5f);
@@ -188,7 +189,6 @@ float3 SampleDDGIIrradiance(DDGIData data, Texture2D<float4> probesState, Textur
#endif
// Debug probe offset visualization
//float4 probeState = probesState.Load(int3(GetDDGIProbeTexelCoords(data, probeIndex), 0));
//probeIrradiance = float3(max(frac(probeState.xyz) * 2, 0.1f));
// Accumulate weighted irradiance