void PushVolumetricLightingGlobalParams(HDCamera hdCamera, CommandBuffer cmd, int frameIndex)
{
if (!Fog.IsVolumetricLightingEnabled(hdCamera))
{
cmd.SetGlobalTexture(HDShaderIDs._VBufferLighting, HDUtils.clearTexture3D);
return;
}
// Get the interpolated anisotropy value.
var fog = VolumeManager.instance.stack.GetComponent <Fog>();
SetPreconvolvedAmbientLightProbe(cmd, fog.globalLightProbeDimmer.value, fog.anisotropy.value);
var currFrameParams = hdCamera.vBufferParams[0];
var prevFrameParams = hdCamera.vBufferParams[1];
// The lighting & density buffers are shared by all cameras.
// The history & feedback buffers are specific to the camera.
// These 2 types of buffers can have different sizes.
// Additionally, history buffers can have different sizes, since they are not resized at the same time
// (every frame, we swap the buffers, and resize the feedback buffer but not the history buffer).
// The viewport size is the same for all of these buffers.
// All of these buffers may have sub-native-resolution viewports.
// The 3rd dimension (number of slices) is the same for all of these buffers.
Vector2Int sharedBufferSize = new Vector2Int(m_LightingBufferHandle.rt.width, m_LightingBufferHandle.rt.height);
Debug.Assert(m_LightingBufferHandle.rt.width == m_DensityBufferHandle.rt.width);
Debug.Assert(m_LightingBufferHandle.rt.height == m_DensityBufferHandle.rt.height);
Vector2Int historyBufferSize = Vector2Int.zero;
if (hdCamera.IsVolumetricReprojectionEnabled())
{
var historyRT = hdCamera.GetPreviousFrameRT((int)HDCameraFrameHistoryType.VolumetricLighting);
historyBufferSize = new Vector2Int(historyRT.rt.width, historyRT.rt.height);
}
var cvp = currFrameParams.viewportSize;
var pvp = prevFrameParams.viewportSize;
// Adjust slices for XR rendering: VBuffer is shared for all single-pass views
int sliceCount = cvp.z / hdCamera.viewCount;
cmd.SetGlobalVector(HDShaderIDs._VBufferViewportSize, new Vector4(cvp.x, cvp.y, 1.0f / cvp.x, 1.0f / cvp.y));
cmd.SetGlobalInt(HDShaderIDs._VBufferSliceCount, sliceCount);
cmd.SetGlobalFloat(HDShaderIDs._VBufferRcpSliceCount, 1.0f / sliceCount);
cmd.SetGlobalVector(HDShaderIDs._VBufferSharedUvScaleAndLimit, currFrameParams.ComputeUvScaleAndLimit(sharedBufferSize));
cmd.SetGlobalVector(HDShaderIDs._VBufferDistanceEncodingParams, currFrameParams.depthEncodingParams);
cmd.SetGlobalVector(HDShaderIDs._VBufferDistanceDecodingParams, currFrameParams.depthDecodingParams);
cmd.SetGlobalFloat(HDShaderIDs._VBufferLastSliceDist, currFrameParams.ComputeLastSliceDistance(sliceCount));
cmd.SetGlobalFloat(HDShaderIDs._VBufferRcpInstancedViewCount, 1.0f / hdCamera.viewCount);
cmd.SetGlobalVector(HDShaderIDs._VBufferPrevViewportSize, new Vector4(pvp.x, pvp.y, 1.0f / pvp.x, 1.0f / pvp.y));
cmd.SetGlobalVector(HDShaderIDs._VBufferHistoryPrevUvScaleAndLimit, prevFrameParams.ComputeUvScaleAndLimit(historyBufferSize));
cmd.SetGlobalVector(HDShaderIDs._VBufferPrevDepthEncodingParams, prevFrameParams.depthEncodingParams);
cmd.SetGlobalVector(HDShaderIDs._VBufferPrevDepthDecodingParams, prevFrameParams.depthDecodingParams);
cmd.SetGlobalTexture(HDShaderIDs._VBufferLighting, m_LightingBufferHandle);
}
DensityVolumeList PrepareVisibleDensityVolumeList(HDCamera hdCamera, CommandBuffer cmd, float time)
{
DensityVolumeList densityVolumes = new DensityVolumeList();
if (!Fog.IsVolumetricLightingEnabled(hdCamera))
{
return(densityVolumes);
}
using (new ProfilingSample(cmd, "Prepare Visible Density Volume List"))
{
Vector3 camPosition = hdCamera.camera.transform.position;
Vector3 camOffset = Vector3.zero;// World-origin-relative
if (ShaderConfig.s_CameraRelativeRendering != 0)
{
camOffset = camPosition; // Camera-relative
}
m_VisibleVolumeBounds.Clear();
m_VisibleVolumeData.Clear();
// Collect all visible finite volume data, and upload it to the GPU.
var volumes = DensityVolumeManager.manager.PrepareDensityVolumeData(cmd, hdCamera.camera, time);
for (int i = 0; i < Math.Min(volumes.Count, k_MaxVisibleVolumeCount); i++)
{
DensityVolume volume = volumes[i];
// TODO: cache these?
var obb = new OrientedBBox(Matrix4x4.TRS(volume.transform.position, volume.transform.rotation, volume.parameters.size));
// Handle camera-relative rendering.
obb.center -= camOffset;
// Frustum cull on the CPU for now. TODO: do it on the GPU.
// TODO: account for custom near and far planes of the V-Buffer's frustum.
// It's typically much shorter (along the Z axis) than the camera's frustum.
if (GeometryUtils.Overlap(obb, hdCamera.frustum, 6, 8))
{
// TODO: cache these?
var data = volume.parameters.ConvertToEngineData();
m_VisibleVolumeBounds.Add(obb);
m_VisibleVolumeData.Add(data);
}
}
m_VisibleVolumeBoundsBuffer.SetData(m_VisibleVolumeBounds);
m_VisibleVolumeDataBuffer.SetData(m_VisibleVolumeData);
// Fill the struct with pointers in order to share the data with the light loop.
densityVolumes.bounds = m_VisibleVolumeBounds;
densityVolumes.density = m_VisibleVolumeData;
return(densityVolumes);
}
}
void PushVolumetricLightingGlobalParams(HDCamera hdCamera, CommandBuffer cmd, int frameIndex)
{
if (!Fog.IsVolumetricLightingEnabled(hdCamera))
{
cmd.SetGlobalTexture(HDShaderIDs._VBufferLighting, HDUtils.clearTexture3D);
return;
}
// Get the interpolated anisotropy value.
var fog = VolumeManager.instance.stack.GetComponent <Fog>();
SetPreconvolvedAmbientLightProbe(cmd, fog.globalLightProbeDimmer.value, fog.anisotropy.value);
var currFrameParams = hdCamera.vBufferParams[0];
var prevFrameParams = hdCamera.vBufferParams[1];
// All buffers are of the same size, and are resized at the same time, at the beginning of the frame.
Vector2Int bufferSize = new Vector2Int(m_LightingBufferHandle.rt.width, m_LightingBufferHandle.rt.height);
var cvp = currFrameParams.viewportSize;
var pvp = prevFrameParams.viewportSize;
cmd.SetGlobalVector(HDShaderIDs._VBufferResolution, new Vector4(cvp.x, cvp.y, 1.0f / cvp.x, 1.0f / cvp.y));
cmd.SetGlobalInt(HDShaderIDs._VBufferSliceCount, cvp.z);
cmd.SetGlobalFloat(HDShaderIDs._VBufferRcpSliceCount, 1.0f / cvp.z);
cmd.SetGlobalVector(HDShaderIDs._VBufferUvScaleAndLimit, currFrameParams.ComputeUvScaleAndLimit(bufferSize));
cmd.SetGlobalVector(HDShaderIDs._VBufferDistanceEncodingParams, currFrameParams.depthEncodingParams);
cmd.SetGlobalVector(HDShaderIDs._VBufferDistanceDecodingParams, currFrameParams.depthDecodingParams);
cmd.SetGlobalFloat(HDShaderIDs._VBufferLastSliceDist, currFrameParams.ComputeLastSliceDistance());
cmd.SetGlobalFloat(HDShaderIDs._VBufferRcpInstancedViewCount, 1.0f / hdCamera.viewCount);
cmd.SetGlobalVector(HDShaderIDs._VBufferPrevResolution, new Vector4(pvp.x, pvp.y, 1.0f / pvp.x, 1.0f / pvp.y));
cmd.SetGlobalVector(HDShaderIDs._VBufferPrevUvScaleAndLimit, prevFrameParams.ComputeUvScaleAndLimit(bufferSize));
cmd.SetGlobalVector(HDShaderIDs._VBufferPrevDepthEncodingParams, prevFrameParams.depthEncodingParams);
cmd.SetGlobalVector(HDShaderIDs._VBufferPrevDepthDecodingParams, prevFrameParams.depthDecodingParams);
cmd.SetGlobalTexture(HDShaderIDs._VBufferLighting, m_LightingBufferHandle);
}
