void FIndirectLightingCache::UpdateBlock(FScene* Scene, FViewInfo* DebugDrawingView, FBlockUpdateInfo& BlockInfo)
{
const int32 NumSamplesPerBlock = BlockInfo.Block.TexelSize * BlockInfo.Block.TexelSize * BlockInfo.Block.TexelSize;
FSHVectorRGB3 SingleSample;
float DirectionalShadowing = 1;
FVector SkyBentNormal(0, 0, 1);
//always do point interpolation to get valid 3band single sample and directional data.
InterpolatePoint(Scene, BlockInfo.Block, DirectionalShadowing, SingleSample, SkyBentNormal);
if (CanIndirectLightingCacheUseVolumeTexture(GetFeatureLevel()) && !BlockInfo.Allocation->bPointSample)
{
static TArray<float> AccumulatedWeight;
AccumulatedWeight.Reset(NumSamplesPerBlock);
AccumulatedWeight.AddZeroed(NumSamplesPerBlock);
//volume textures are encoded as two band, so no reason to waste perf interpolating 3 bands.
static TArray<FSHVectorRGB2> AccumulatedIncidentRadiance;
AccumulatedIncidentRadiance.Reset(NumSamplesPerBlock);
AccumulatedIncidentRadiance.AddZeroed(NumSamplesPerBlock);
// Interpolate SH samples from precomputed lighting samples and accumulate lighting data for an entire block
InterpolateBlock(Scene, BlockInfo.Block, AccumulatedWeight, AccumulatedIncidentRadiance);
static TArray<FFloat16Color> Texture0Data;
static TArray<FFloat16Color> Texture1Data;
static TArray<FFloat16Color> Texture2Data;
Texture0Data.Reset(NumSamplesPerBlock);
Texture1Data.Reset(NumSamplesPerBlock);
Texture2Data.Reset(NumSamplesPerBlock);
Texture0Data.AddUninitialized(NumSamplesPerBlock);
Texture1Data.AddUninitialized(NumSamplesPerBlock);
Texture2Data.AddUninitialized(NumSamplesPerBlock);
const int32 FormatSize = GPixelFormats[PF_FloatRGBA].BlockBytes;
check(FormatSize == sizeof(FFloat16Color));
// Encode the SH samples into a texture format
// Note the single sample is updated even if this is a volume allocation, because translucent materials only use the single sample
EncodeBlock(DebugDrawingView, BlockInfo.Block, AccumulatedWeight, AccumulatedIncidentRadiance, Texture0Data, Texture1Data, Texture2Data);
// Setup an update region
const FUpdateTextureRegion3D UpdateRegion(
BlockInfo.Block.MinTexel.X,
BlockInfo.Block.MinTexel.Y,
BlockInfo.Block.MinTexel.Z,
0,
0,
0,
BlockInfo.Block.TexelSize,
BlockInfo.Block.TexelSize,
BlockInfo.Block.TexelSize);
// Update the volume texture atlas
RHIUpdateTexture3D((const FTexture3DRHIRef&)GetTexture0().ShaderResourceTexture, 0, UpdateRegion, BlockInfo.Block.TexelSize * FormatSize, BlockInfo.Block.TexelSize * BlockInfo.Block.TexelSize * FormatSize, (const uint8*)Texture0Data.GetData());
RHIUpdateTexture3D((const FTexture3DRHIRef&)GetTexture1().ShaderResourceTexture, 0, UpdateRegion, BlockInfo.Block.TexelSize * FormatSize, BlockInfo.Block.TexelSize * BlockInfo.Block.TexelSize * FormatSize, (const uint8*)Texture1Data.GetData());
RHIUpdateTexture3D((const FTexture3DRHIRef&)GetTexture2().ShaderResourceTexture, 0, UpdateRegion, BlockInfo.Block.TexelSize * FormatSize, BlockInfo.Block.TexelSize * BlockInfo.Block.TexelSize * FormatSize, (const uint8*)Texture2Data.GetData());
}
else
{
if (GCacheDrawInterpolationPoints != 0 && DebugDrawingView)
{
FViewElementPDI DebugPDI(DebugDrawingView, NULL);
const FVector WorldPosition = BlockInfo.Block.Min;
DebugPDI.DrawPoint(WorldPosition, FLinearColor(0, 0, 1), 10, SDPG_World);
}
}
// Record the position that the sample was taken at
BlockInfo.Allocation->TargetPosition = BlockInfo.Block.Min + BlockInfo.Block.Size / 2;
BlockInfo.Allocation->TargetSamplePacked0[0] = FVector4(SingleSample.R.V[0], SingleSample.R.V[1], SingleSample.R.V[2], SingleSample.R.V[3]) / PI;
BlockInfo.Allocation->TargetSamplePacked0[1] = FVector4(SingleSample.G.V[0], SingleSample.G.V[1], SingleSample.G.V[2], SingleSample.G.V[3]) / PI;
BlockInfo.Allocation->TargetSamplePacked0[2] = FVector4(SingleSample.B.V[0], SingleSample.B.V[1], SingleSample.B.V[2], SingleSample.B.V[3]) / PI;
BlockInfo.Allocation->TargetSamplePacked1[0] = FVector4(SingleSample.R.V[4], SingleSample.R.V[5], SingleSample.R.V[6], SingleSample.R.V[7]) / PI;
BlockInfo.Allocation->TargetSamplePacked1[1] = FVector4(SingleSample.G.V[4], SingleSample.G.V[5], SingleSample.G.V[6], SingleSample.G.V[7]) / PI;
BlockInfo.Allocation->TargetSamplePacked1[2] = FVector4(SingleSample.B.V[4], SingleSample.B.V[5], SingleSample.B.V[6], SingleSample.B.V[7]) / PI;
BlockInfo.Allocation->TargetSamplePacked2 = FVector4(SingleSample.R.V[8], SingleSample.G.V[8], SingleSample.B.V[8], 0) / PI;
BlockInfo.Allocation->TargetDirectionalShadowing = DirectionalShadowing;
const float BentNormalLength = SkyBentNormal.Size();
BlockInfo.Allocation->TargetSkyBentNormal = FVector4(SkyBentNormal / FMath::Max(BentNormalLength, .0001f), BentNormalLength);
if (!BlockInfo.Allocation->bHasEverUpdatedSingleSample)
{
// If this is the first update, also set the interpolated state to match the new target
//@todo - detect and handle teleports in the same way
BlockInfo.Allocation->SingleSamplePosition = BlockInfo.Allocation->TargetPosition;
for (int32 VectorIndex = 0; VectorIndex < 3; VectorIndex++) // RGB
{
BlockInfo.Allocation->SingleSamplePacked0[VectorIndex] = BlockInfo.Allocation->TargetSamplePacked0[VectorIndex];
BlockInfo.Allocation->SingleSamplePacked1[VectorIndex] = BlockInfo.Allocation->TargetSamplePacked1[VectorIndex];
}
BlockInfo.Allocation->SingleSamplePacked2 = BlockInfo.Allocation->TargetSamplePacked2;
BlockInfo.Allocation->CurrentDirectionalShadowing = BlockInfo.Allocation->TargetDirectionalShadowing;
BlockInfo.Allocation->CurrentSkyBentNormal = BlockInfo.Allocation->TargetSkyBentNormal;
BlockInfo.Allocation->bHasEverUpdatedSingleSample = true;
}
BlockInfo.Block.bHasEverBeenUpdated = true;
}
void FIndirectLightingCache::UpdateBlock(FScene* Scene, FViewInfo* DebugDrawingView, FBlockUpdateInfo& BlockInfo)
{
const int32 NumSamplesPerBlock = BlockInfo.Block.TexelSize * BlockInfo.Block.TexelSize * BlockInfo.Block.TexelSize;
FSHVectorRGB2 SingleSample;
float DirectionalShadowing = 1;
if (CanIndirectLightingCacheUseVolumeTexture() && BlockInfo.Allocation->bOpaqueRelevance)
{
static TArray<float> AccumulatedWeight;
AccumulatedWeight.Reset(NumSamplesPerBlock);
AccumulatedWeight.AddZeroed(NumSamplesPerBlock);
static TArray<FSHVectorRGB2> AccumulatedIncidentRadiance;
AccumulatedIncidentRadiance.Reset(NumSamplesPerBlock);
AccumulatedIncidentRadiance.AddZeroed(NumSamplesPerBlock);
// Interpolate SH samples from precomputed lighting samples and accumulate lighting data for an entire block
InterpolateBlock(Scene, BlockInfo.Block, AccumulatedWeight, AccumulatedIncidentRadiance);
static TArray<FFloat16Color> Texture0Data;
static TArray<FFloat16Color> Texture1Data;
static TArray<FFloat16Color> Texture2Data;
Texture0Data.Reset(NumSamplesPerBlock);
Texture1Data.Reset(NumSamplesPerBlock);
Texture2Data.Reset(NumSamplesPerBlock);
Texture0Data.AddUninitialized(NumSamplesPerBlock);
Texture1Data.AddUninitialized(NumSamplesPerBlock);
Texture2Data.AddUninitialized(NumSamplesPerBlock);
const int32 FormatSize = GPixelFormats[PF_FloatRGBA].BlockBytes;
check(FormatSize == sizeof(FFloat16Color));
// Encode the SH samples into a texture format
EncodeBlock(DebugDrawingView, BlockInfo.Block, AccumulatedWeight, AccumulatedIncidentRadiance, Texture0Data, Texture1Data, Texture2Data, SingleSample);
// Setup an update region
const FUpdateTextureRegion3D UpdateRegion(
BlockInfo.Block.MinTexel.X,
BlockInfo.Block.MinTexel.Y,
BlockInfo.Block.MinTexel.Z,
0,
0,
0,
BlockInfo.Block.TexelSize,
BlockInfo.Block.TexelSize,
BlockInfo.Block.TexelSize);
// Update the volume texture atlas
RHIUpdateTexture3D((const FTexture3DRHIRef&)GetTexture0().ShaderResourceTexture, 0, UpdateRegion, BlockInfo.Block.TexelSize * FormatSize, BlockInfo.Block.TexelSize * BlockInfo.Block.TexelSize * FormatSize, (const uint8*)Texture0Data.GetData());
RHIUpdateTexture3D((const FTexture3DRHIRef&)GetTexture1().ShaderResourceTexture, 0, UpdateRegion, BlockInfo.Block.TexelSize * FormatSize, BlockInfo.Block.TexelSize * BlockInfo.Block.TexelSize * FormatSize, (const uint8*)Texture1Data.GetData());
RHIUpdateTexture3D((const FTexture3DRHIRef&)GetTexture2().ShaderResourceTexture, 0, UpdateRegion, BlockInfo.Block.TexelSize * FormatSize, BlockInfo.Block.TexelSize * BlockInfo.Block.TexelSize * FormatSize, (const uint8*)Texture2Data.GetData());
}
else
{
InterpolatePoint(Scene, BlockInfo.Block, DirectionalShadowing, SingleSample);
}
// Record the position that the sample was taken at
BlockInfo.Allocation->TargetPosition = BlockInfo.Block.Min + BlockInfo.Block.Size / 2;
BlockInfo.Allocation->TargetSamplePacked[0] = FVector4(SingleSample.R.V[0], SingleSample.R.V[1], SingleSample.R.V[2], SingleSample.R.V[3]) / PI;
BlockInfo.Allocation->TargetSamplePacked[1] = FVector4(SingleSample.G.V[0], SingleSample.G.V[1], SingleSample.G.V[2], SingleSample.G.V[3]) / PI;
BlockInfo.Allocation->TargetSamplePacked[2] = FVector4(SingleSample.B.V[0], SingleSample.B.V[1], SingleSample.B.V[2], SingleSample.B.V[3]) / PI;
BlockInfo.Allocation->TargetDirectionalShadowing = DirectionalShadowing;
if (!BlockInfo.Allocation->bHasEverUpdatedSingleSample)
{
// If this is the first update, also set the interpolated state to match the new target
//@todo - detect and handle teleports in the same way
BlockInfo.Allocation->SingleSamplePosition = BlockInfo.Allocation->TargetPosition;
for (int32 VectorIndex = 0; VectorIndex < ARRAY_COUNT(BlockInfo.Allocation->SingleSamplePacked); VectorIndex++)
{
BlockInfo.Allocation->SingleSamplePacked[VectorIndex] = BlockInfo.Allocation->TargetSamplePacked[VectorIndex];
}
BlockInfo.Allocation->CurrentDirectionalShadowing = BlockInfo.Allocation->TargetDirectionalShadowing;
BlockInfo.Allocation->bHasEverUpdatedSingleSample = true;
}
BlockInfo.Block.bHasEverBeenUpdated = true;
}