public void Build(HDRenderPipelineAsset asset)
{
m_SupportVolumetrics = asset.currentPlatformRenderPipelineSettings.supportVolumetrics;
if (!m_SupportVolumetrics)
{
return;
}
preset = asset.currentPlatformRenderPipelineSettings.increaseResolutionOfVolumetrics
? VolumetricLightingPreset.High
: VolumetricLightingPreset.Medium;
m_VolumeVoxelizationCS = asset.renderPipelineResources.shaders.volumeVoxelizationCS;
m_VolumetricLightingCS = asset.renderPipelineResources.shaders.volumetricLightingCS;
m_PackedCoeffs = new Vector4[7];
m_PhaseZH = new ZonalHarmonicsL2();
m_PhaseZH.coeffs = new float[3];
m_xySeq = new Vector2[7];
m_xySeqOffset = new Vector4();
CreateBuffers();
}
public void InitializeVolumetricLighting()
{
m_SupportVolumetrics = asset.currentPlatformRenderPipelineSettings.supportVolumetrics;
if (!m_SupportVolumetrics)
{
return;
}
preset = asset.currentPlatformRenderPipelineSettings.increaseResolutionOfVolumetrics
? VolumetricLightingPreset.High
: VolumetricLightingPreset.Medium;
m_VolumeVoxelizationCS = asset.renderPipelineResources.shaders.volumeVoxelizationCS;
m_VolumetricLightingCS = asset.renderPipelineResources.shaders.volumetricLightingCS;
m_PackedCoeffs = new Vector4[7];
m_PhaseZH = new ZonalHarmonicsL2();
m_PhaseZH.coeffs = new float[3];
m_xySeq = new Vector2[7];
m_xySeqOffset = new Vector4();
m_PixelCoordToViewDirWS = new Matrix4x4[TextureXR.kMaxSlices];
CreateVolumetricLightingBuffers();
}
static int ComputeVBufferSliceCount(VolumetricLightingPreset preset)
{
var result = 0;
switch (preset)
{
case VolumetricLightingPreset.Medium:
result = 64;
break;
case VolumetricLightingPreset.High:
result = 128;
break;
case VolumetricLightingPreset.Off:
result = 0;
break;
default:
Debug.Assert(false, "Encountered an unexpected VolumetricLightingPreset.");
result = 0;
break;
}
return(result);
}
static int ComputeVBufferSliceCount(VolumetricLightingPreset preset, bool accountForXR = false)
{
var result = 0;
switch (preset)
{
case VolumetricLightingPreset.Medium:
result = 64;
break;
case VolumetricLightingPreset.High:
result = 128;
break;
case VolumetricLightingPreset.Off:
result = 0;
break;
default:
Debug.Assert(false, "Encountered an unexpected VolumetricLightingPreset.");
result = 0;
break;
}
if (accountForXR)
{
// With XR single-pass, the VBuffer size is increased and split into compartments for each eye
if (TextureXR.useTexArray)
{
result = result * TextureXR.slices;
}
}
return(result);
}
static Vector3Int ComputeVBufferResolution(VolumetricLightingPreset preset, int screenWidth, int screenHeight)
{
int t = ComputeVBufferTileSize(preset);
int w = HDUtils.DivRoundUp(screenWidth, t);
int h = HDUtils.DivRoundUp(screenHeight, t);
int d = ComputeVBufferSliceCount(preset);
return(new Vector3Int(w, h, d));
}
static Vector3Int ComputeVBufferResolution(VolumetricLightingPreset preset,
int screenWidth, int screenHeight)
{
int t = ComputeVBufferTileSize(preset);
// ceil(ScreenSize / TileSize).
int w = (screenWidth + (t - 1)) / t;
int h = (screenHeight + (t - 1)) / t;
int d = ComputeVBufferSliceCount(preset);
return(new Vector3Int(w, h, d));
}
// Since a single voxel corresponds to a tile (e.g. 8x8) of pixels,
// the VBuffer can potentially extend past the boundaries of the viewport.
// The function returns the fraction of the {width, height} of the VBuffer visible on screen.
// Note: for performance reasons, the scale is unused (implicitly 1). The error is typically under 1%.
static Vector2 ComputeVBufferResolutionAndScale(VolumetricLightingPreset preset,
int screenWidth, int screenHeight,
ref int w, ref int h, ref int d)
{
int t = ComputeVBufferTileSize(preset);
// Ceil(ScreenSize / TileSize).
w = (screenWidth + t - 1) / t;
h = (screenHeight + t - 1) / t;
d = ComputeVBufferSliceCount(preset);
return(new Vector2((float)screenWidth / (float)(w * t), (float)screenHeight / (float)(h * t)));
}
public void Build(HDRenderPipelineAsset asset)
{
m_supportVolumetrics = asset.renderPipelineSettings.supportVolumetrics;
if (!m_supportVolumetrics)
{
return;
}
preset = asset.renderPipelineSettings.increaseResolutionOfVolumetrics ? VolumetricLightingPreset.High :
VolumetricLightingPreset.Medium;
m_VolumeVoxelizationCS = asset.renderPipelineResources.volumeVoxelizationCS;
m_VolumetricLightingCS = asset.renderPipelineResources.volumetricLightingCS;
CreateBuffers();
}
static int ComputeVBufferSliceCount(VolumetricLightingPreset preset)
{
switch (preset)
{
case VolumetricLightingPreset.Medium:
return(64);
case VolumetricLightingPreset.High:
return(128);
case VolumetricLightingPreset.Off:
return(0);
default:
Debug.Assert(false, "Encountered an unexpected VolumetricLightingPreset.");
return(0);
}
}
static int ComputeVBufferTileSize(VolumetricLightingPreset preset)
{
switch (preset)
{
case VolumetricLightingPreset.Normal:
return(8);
case VolumetricLightingPreset.Ultra:
return(4);
case VolumetricLightingPreset.Off:
return(0);
default:
Debug.Assert(false, "Encountered an unexpected VolumetricLightingPreset.");
return(0);
}
}