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Optimize DDGI probe classify if using non-iterative relocation

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This commit is contained in:
Wojciech Figat
2022-07-04 08:45:31 +02:00
parent a8a34b391b
commit 5a366bc1a0
2 changed files with 31 additions and 3 deletions
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4
Source/Shaders/GI/DDGI.shader
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@@ -103,8 +103,12 @@ void CS_Classify(uint3 DispatchThreadId : SV_DispatchThreadID)
float4 probeStateOld = probeState;
// Use Global SDF to quickly get distance and direction to the scene geometry
#if DDGI_PROBE_RELOCATE_ITERATIVE
float sdf;
float3 sdfNormal = normalize(SampleGlobalSDFGradient(GlobalSDF, GlobalSDFTex, GlobalSDFMip, probePosition, sdf));
#else
float sdf = SampleGlobalSDF(GlobalSDF, GlobalSDFTex, GlobalSDFMip, probePosition);
#endif
float sdfDst = abs(sdf);
float threshold = GlobalSDF.CascadeVoxelSize[CascadeIndex];
float distanceLimit = length(probesSpacing) * 1.5f;

30
Source/Shaders/GlobalSignDistanceField.hlsl
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@@ -107,7 +107,7 @@ float SampleGlobalSDF(const GlobalSDFData data, Texture3D<float> tex, float3 wor
float3 cascadeUV, textureUV;
GetGlobalSDFCascadeUV(data, cascade, worldPosition, cascadeMaxDistance, cascadeUV, textureUV);
float cascadeDistance = tex.SampleLevel(SamplerLinearClamp, textureUV, 0);
if (cascadeDistance < 1.0f && !any(cascadeUV < 0) && !any(cascadeUV > 1))
if (cascadeDistance < 0.9f && !any(cascadeUV < 0) && !any(cascadeUV > 1))
{
distance = cascadeDistance * cascadeMaxDistance;
break;
@@ -116,6 +116,32 @@ float SampleGlobalSDF(const GlobalSDFData data, Texture3D<float> tex, float3 wor
return distance;
}
// Samples the Global SDF and returns the distance to the closest surface (in world units) at the given world location.
float SampleGlobalSDF(const GlobalSDFData data, Texture3D<float> tex, Texture3D<float> mip, float3 worldPosition)
{
float distance = data.CascadePosDistance[3].w * 2.0f;
if (distance <= 0.0f)
return GLOBAL_SDF_WORLD_SIZE;
float chunkSizeDistance = (float)GLOBAL_SDF_RASTERIZE_CHUNK_SIZE / data.Resolution; // Size of the chunk in SDF distance (0-1)
float chunkMarginDistance = (float)GLOBAL_SDF_RASTERIZE_CHUNK_MARGIN / data.Resolution; // Size of the chunk margin in SDF distance (0-1)
for (uint cascade = 0; cascade < data.CascadesCount; cascade++)
{
float cascadeMaxDistance;
float3 cascadeUV, textureUV;
GetGlobalSDFCascadeUV(data, cascade, worldPosition, cascadeMaxDistance, cascadeUV, textureUV);
float cascadeDistance = mip.SampleLevel(SamplerLinearClamp, textureUV, 0);
if (cascadeDistance < chunkSizeDistance && !any(cascadeUV < 0) && !any(cascadeUV > 1))
{
float cascadeDistanceTex = tex.SampleLevel(SamplerLinearClamp, textureUV, 0);
if (cascadeDistanceTex < chunkMarginDistance * 2)
cascadeDistance = cascadeDistanceTex;
distance = cascadeDistance * cascadeMaxDistance;
break;
}
}
return distance;
}
// Samples the Global SDF and returns the gradient vector (derivative) at the given world location. Normalize it to get normal vector.
float3 SampleGlobalSDFGradient(const GlobalSDFData data, Texture3D<float> tex, float3 worldPosition, out float distance)
{
@@ -165,9 +191,7 @@ float3 SampleGlobalSDFGradient(const GlobalSDFData data, Texture3D<float> tex, T
{
float cascadeDistanceTex = tex.SampleLevel(SamplerLinearClamp, textureUV, 0);
if (cascadeDistanceTex < chunkMarginDistance * 2)
{
cascadeDistance = cascadeDistanceTex;
}
float texelOffset = 1.0f / data.Resolution;
float xp = tex.SampleLevel(SamplerLinearClamp, float3(textureUV.x + texelOffset, textureUV.y, textureUV.z), 0).x;
float xn = tex.SampleLevel(SamplerLinearClamp, float3(textureUV.x - texelOffset, textureUV.y, textureUV.z), 0).x;