public void RenderSky(SkyUpdateContext skyContext, HDCamera hdCamera, Light sunLight, RTHandleSystem.RTHandle colorBuffer, RTHandleSystem.RTHandle depthBuffer, DebugDisplaySettings debugSettings, CommandBuffer cmd)
{
if (skyContext.IsValid() && hdCamera.clearColorMode == HDAdditionalCameraData.ClearColorMode.Sky)
{
using (new ProfilingSample(cmd, "Sky Pass"))
{
m_BuiltinParameters.commandBuffer = cmd;
m_BuiltinParameters.sunLight = sunLight;
m_BuiltinParameters.pixelCoordToViewDirMatrix = HDUtils.ComputePixelCoordToWorldSpaceViewDirectionMatrix(hdCamera.camera.fieldOfView * Mathf.Deg2Rad, hdCamera.screenSize, hdCamera.viewMatrix, false);
m_BuiltinParameters.invViewProjMatrix = hdCamera.viewProjMatrix.inverse;
m_BuiltinParameters.screenSize = hdCamera.screenSize;
m_BuiltinParameters.cameraPosWS = hdCamera.camera.transform.position;
m_BuiltinParameters.colorBuffer = colorBuffer;
m_BuiltinParameters.depthBuffer = depthBuffer;
m_BuiltinParameters.hdCamera = hdCamera;
m_BuiltinParameters.debugSettings = debugSettings;
skyContext.renderer.SetRenderTargets(m_BuiltinParameters);
// If the luxmeter is enabled, we don't render the sky
if (debugSettings.lightingDebugSettings.debugLightingMode != DebugLightingMode.LuxMeter)
{
// When rendering the visual sky for reflection probes, we need to remove the sun disk if skySettings.includeSunInBaking is false.
skyContext.renderer.RenderSky(m_BuiltinParameters, false, hdCamera.camera.cameraType != CameraType.Reflection || skyContext.skySettings.includeSunInBaking);
}
}
}
}
void FilterCubemapCommon(CommandBuffer cmd,
Texture source, RenderTexture target,
Matrix4x4[] worldToViewMatrices)
{
int mipCount = 1 + (int)Mathf.Log(source.width, 2.0f);
if (mipCount < ((int)EnvConstants.SpecCubeLodStep + 1))
{
Debug.LogWarning("RenderCubemapGGXConvolution: Cubemap size is too small for GGX convolution, needs at least " + ((int)EnvConstants.SpecCubeLodStep + 1) + " mip levels");
return;
}
// Copy the first mip
using (new ProfilingSample(cmd, "Copy Original Mip"))
{
for (int f = 0; f < 6; f++)
{
cmd.CopyTexture(source, f, 0, target, f, 0);
}
}
// Solid angle associated with a texel of the cubemap.
float invOmegaP = (6.0f * source.width * source.width) / (4.0f * Mathf.PI);
if (!m_GgxIblSampleData.IsCreated())
{
m_GgxIblSampleData.Create();
InitializeGgxIblSampleData(cmd);
}
m_convolveMaterial.SetTexture("_GgxIblSamples", m_GgxIblSampleData);
var props = new MaterialPropertyBlock();
props.SetTexture("_MainTex", source);
props.SetFloat("_InvOmegaP", invOmegaP);
for (int mip = 1; mip < ((int)EnvConstants.SpecCubeLodStep + 1); ++mip)
{
props.SetFloat("_Level", mip);
using (new ProfilingSample(cmd, "Filter Cubemap Mip {0}", mip))
{
for (int face = 0; face < 6; ++face)
{
var faceSize = new Vector4(source.width >> mip, source.height >> mip, 1.0f / (source.width >> mip), 1.0f / (source.height >> mip));
var transform = HDUtils.ComputePixelCoordToWorldSpaceViewDirectionMatrix(0.5f * Mathf.PI, Vector2.zero, faceSize, worldToViewMatrices[face], true);
props.SetMatrix(HDShaderIDs._PixelCoordToViewDirWS, transform);
CoreUtils.SetRenderTarget(cmd, target, ClearFlag.None, mip, (CubemapFace)face);
CoreUtils.DrawFullScreen(cmd, m_convolveMaterial, props);
}
}
}
}
public void RebuildSkyMatrices(int resolution)
{
var cubeProj = Matrix4x4.Perspective(90.0f, 1.0f, 0.01f, 1.0f);
for (int i = 0; i < 6; ++i)
{
var lookAt = Matrix4x4.LookAt(Vector3.zero, CoreUtils.lookAtList[i], CoreUtils.upVectorList[i]);
var worldToView = lookAt * Matrix4x4.Scale(new Vector3(1.0f, 1.0f, -1.0f)); // Need to scale -1.0 on Z to match what is being done in the camera.wolrdToCameraMatrix API. ...
m_facePixelCoordToViewDirMatrices[i] = HDUtils.ComputePixelCoordToWorldSpaceViewDirectionMatrix(0.5f * Mathf.PI, Vector2.zero, m_CubemapScreenSize, worldToView, true);
}
}
public void VolumeVoxelizationPass(DensityVolumeList densityVolumes, HDCamera camera, CommandBuffer cmd, FrameSettings settings)
{
if (preset == VolumetricLightingPreset.Off)
{
return;
}
using (new ProfilingSample(cmd, "Volume Voxelization"))
{
int numVisibleVolumes = m_VisibleVolumeBounds.Count;
if (numVisibleVolumes == 0)
{
// Clear the render target instead of running the shader.
// CoreUtils.SetRenderTarget(cmd, vBuffer.GetDensityBuffer(), ClearFlag.Color, CoreUtils.clearColorAllBlack);
// return;
// Clearing 3D textures does not seem to work!
// Use the workaround by running the full shader with 0 density.
}
VBuffer vBuffer = FindVBuffer(camera.GetViewID());
Debug.Assert(vBuffer != null);
int w = 0, h = 0, d = 0;
vBuffer.GetResolution(ref w, ref h, ref d);
bool enableClustered = settings.lightLoopSettings.enableTileAndCluster;
int kernel = m_VolumeVoxelizationCS.FindKernel(enableClustered ? "VolumeVoxelizationClustered"
: "VolumeVoxelizationBruteforce");
float vFoV = camera.camera.fieldOfView * Mathf.Deg2Rad;
Vector4 resolution = new Vector4(w, h, 1.0f / w, 1.0f / h);
Matrix4x4 transform = HDUtils.ComputePixelCoordToWorldSpaceViewDirectionMatrix(vFoV, resolution, camera.viewMatrix, false);
camera.SetupComputeShader(m_VolumeVoxelizationCS, cmd);
cmd.SetComputeTextureParam(m_VolumeVoxelizationCS, kernel, HDShaderIDs._VBufferDensity, vBuffer.GetDensityBuffer());
cmd.SetComputeBufferParam(m_VolumeVoxelizationCS, kernel, HDShaderIDs._VolumeBounds, s_VisibleVolumeBoundsBuffer);
cmd.SetComputeBufferParam(m_VolumeVoxelizationCS, kernel, HDShaderIDs._VolumeProperties, s_VisibleVolumePropertiesBuffer);
// TODO: set the constant buffer data only once.
cmd.SetComputeMatrixParam(m_VolumeVoxelizationCS, HDShaderIDs._VBufferCoordToViewDirWS, transform);
cmd.SetComputeIntParam(m_VolumeVoxelizationCS, HDShaderIDs._NumVisibleDensityVolumes, numVisibleVolumes);
// The shader defines GROUP_SIZE_1D = 8.
cmd.DispatchCompute(m_VolumeVoxelizationCS, kernel, (w + 7) / 8, (h + 7) / 8, 1);
}
}
void RebuildSkyMatrices(float nearPlane, float farPlane)
{
if (!m_SkySettings)
{
return;
}
var cubeProj = Matrix4x4.Perspective(90.0f, 1.0f, nearPlane, farPlane);
for (int i = 0; i < 6; ++i)
{
var lookAt = Matrix4x4.LookAt(Vector3.zero, CoreUtils.lookAtList[i], CoreUtils.upVectorList[i]);
var worldToView = lookAt * Matrix4x4.Scale(new Vector3(1.0f, 1.0f, -1.0f)); // Need to scale -1.0 on Z to match what is being done in the camera.wolrdToCameraMatrix API. ...
var screenSize = new Vector4((int)m_SkySettings.resolution, (int)m_SkySettings.resolution, 1.0f / (int)m_SkySettings.resolution, 1.0f / (int)m_SkySettings.resolution);
m_facePixelCoordToViewDirMatrices[i] = HDUtils.ComputePixelCoordToWorldSpaceViewDirectionMatrix(0.5f * Mathf.PI, screenSize, worldToView, true);
m_faceCameraInvViewProjectionMatrix[i] = HDUtils.GetViewProjectionMatrix(lookAt, cubeProj).inverse;
}
}
public void RenderSky(SkyUpdateContext skyContext, HDCamera camera, Light sunLight, RenderTargetIdentifier colorBuffer, RenderTargetIdentifier depthBuffer, CommandBuffer cmd)
{
if (skyContext.IsValid())
{
using (new ProfilingSample(cmd, "Sky Pass"))
{
m_BuiltinParameters.commandBuffer = cmd;
m_BuiltinParameters.sunLight = sunLight;
m_BuiltinParameters.pixelCoordToViewDirMatrix = HDUtils.ComputePixelCoordToWorldSpaceViewDirectionMatrix(camera.camera.fieldOfView * Mathf.Deg2Rad, camera.screenSize, camera.viewMatrix, false);
m_BuiltinParameters.invViewProjMatrix = camera.viewProjMatrix.inverse;
m_BuiltinParameters.screenSize = camera.screenSize;
m_BuiltinParameters.cameraPosWS = camera.camera.transform.position;
m_BuiltinParameters.colorBuffer = colorBuffer;
m_BuiltinParameters.depthBuffer = depthBuffer;
skyContext.renderer.SetRenderTargets(m_BuiltinParameters);
skyContext.renderer.RenderSky(m_BuiltinParameters, false);
}
}
}
public void RenderSky(SkyUpdateContext skyContext, HDCamera hdCamera, Light sunLight, RTHandle colorBuffer, RTHandle depthBuffer, CommandBuffer cmd)
{
if (skyContext.IsValid() && hdCamera.clearColorMode == HDAdditionalCameraData.ClearColorMode.Sky)
{
using (new ProfilingSample(cmd, "Sky Pass"))
{
m_BuiltinParameters.commandBuffer = cmd;
m_BuiltinParameters.sunLight = sunLight;
m_BuiltinParameters.pixelCoordToViewDirMatrix = HDUtils.ComputePixelCoordToWorldSpaceViewDirectionMatrix(hdCamera.camera.fieldOfView * Mathf.Deg2Rad, hdCamera.screenSize, hdCamera.viewMatrix, false);
m_BuiltinParameters.invViewProjMatrix = hdCamera.viewProjMatrix.inverse;
m_BuiltinParameters.screenSize = hdCamera.screenSize;
m_BuiltinParameters.cameraPosWS = hdCamera.camera.transform.position;
m_BuiltinParameters.colorBuffer = colorBuffer;
m_BuiltinParameters.depthBuffer = depthBuffer;
m_BuiltinParameters.hdCamera = hdCamera;
skyContext.renderer.SetRenderTargets(m_BuiltinParameters);
skyContext.renderer.RenderSky(m_BuiltinParameters, false);
}
}
}
public void RenderSky(HDCamera camera, Light sunLight, RenderTargetIdentifier colorBuffer, RenderTargetIdentifier depthBuffer, CommandBuffer cmd, FrameSettings m_frameSettings)
{
using (new ProfilingSample(cmd, "Sky Pass"))
{
if (IsSkyValid())
{
// Rendering the sky is the first time in the frame where we need fog parameters so we push them here for the whole frame.
m_SkySettings.atmosphericScatteringSettings.PushShaderParameters(cmd, m_frameSettings);
m_BuiltinParameters.commandBuffer = cmd;
m_BuiltinParameters.sunLight = sunLight;
m_BuiltinParameters.pixelCoordToViewDirMatrix = HDUtils.ComputePixelCoordToWorldSpaceViewDirectionMatrix(camera.camera.fieldOfView * Mathf.Deg2Rad, camera.screenSize, camera.viewMatrix, false);
m_BuiltinParameters.invViewProjMatrix = camera.viewProjMatrix.inverse;
m_BuiltinParameters.screenSize = camera.screenSize;
m_BuiltinParameters.cameraPosWS = camera.camera.transform.position;
m_BuiltinParameters.colorBuffer = colorBuffer;
m_BuiltinParameters.depthBuffer = depthBuffer;
m_Renderer.SetRenderTargets(m_BuiltinParameters);
m_Renderer.RenderSky(m_BuiltinParameters, false);
}
}
}
public void VolumeVoxelizationPass(HDCamera hdCamera, CommandBuffer cmd, uint frameIndex, DensityVolumeList densityVolumes, LightLoop lightLoop)
{
if (!hdCamera.frameSettings.IsEnabled(FrameSettingsField.Volumetrics))
{
return;
}
var visualEnvironment = VolumeManager.instance.stack.GetComponent <VisualEnvironment>();
if (visualEnvironment.fogType.value != FogType.Volumetric)
{
return;
}
using (new ProfilingSample(cmd, "Volume Voxelization"))
{
int numVisibleVolumes = m_VisibleVolumeBounds.Count;
bool tiledLighting = lightLoop.HasLightToCull() && hdCamera.frameSettings.IsEnabled(FrameSettingsField.BigTilePrepass);
bool highQuality = preset == VolumetricLightingPreset.High;
int kernel = (tiledLighting ? 1 : 0) | (highQuality ? 2 : 0);
var currFrameParams = hdCamera.vBufferParams[0];
var cvp = currFrameParams.viewportSize;
Vector4 resolution = new Vector4(cvp.x, cvp.y, 1.0f / cvp.x, 1.0f / cvp.y);
#if UNITY_2019_1_OR_NEWER
var vFoV = hdCamera.camera.GetGateFittedFieldOfView() * Mathf.Deg2Rad;
var lensShift = hdCamera.camera.GetGateFittedLensShift();
#else
var vFoV = hdCamera.camera.fieldOfView * Mathf.Deg2Rad;
var lensShift = Vector2.zero;
#endif
// Compose the matrix which allows us to compute the world space view direction.
Matrix4x4 transform = HDUtils.ComputePixelCoordToWorldSpaceViewDirectionMatrix(vFoV, lensShift, resolution, hdCamera.mainViewConstants.viewMatrix, false);
// Compute texel spacing at the depth of 1 meter.
float unitDepthTexelSpacing = HDUtils.ComputZPlaneTexelSpacing(1.0f, vFoV, resolution.y);
Texture3D volumeAtlas = DensityVolumeManager.manager.volumeAtlas.GetAtlas();
Vector4 volumeAtlasDimensions = new Vector4(0.0f, 0.0f, 0.0f, 0.0f);
if (volumeAtlas != null)
{
volumeAtlasDimensions.x = (float)volumeAtlas.width / volumeAtlas.depth; // 1 / number of textures
volumeAtlasDimensions.y = volumeAtlas.width;
volumeAtlasDimensions.z = volumeAtlas.depth;
volumeAtlasDimensions.w = Mathf.Log(volumeAtlas.width, 2); // Max LoD
}
else
{
volumeAtlas = CoreUtils.blackVolumeTexture;
}
if (hdCamera.frameSettings.VolumeVoxelizationRunsAsync())
{
// We explicitly set the big tile info even though it is set globally, since this could be running async before the PushGlobalParams
cmd.SetComputeIntParam(m_VolumeVoxelizationCS, HDShaderIDs._NumTileBigTileX, lightLoop.GetNumTileBigTileX(hdCamera));
cmd.SetComputeIntParam(m_VolumeVoxelizationCS, HDShaderIDs._NumTileBigTileY, lightLoop.GetNumTileBigTileY(hdCamera));
if (tiledLighting)
{
cmd.SetComputeBufferParam(m_VolumeVoxelizationCS, kernel, HDShaderIDs.g_vBigTileLightList, lightLoop.GetBigTileLightList());
}
}
cmd.SetComputeTextureParam(m_VolumeVoxelizationCS, kernel, HDShaderIDs._VBufferDensity, m_DensityBufferHandle);
cmd.SetComputeBufferParam(m_VolumeVoxelizationCS, kernel, HDShaderIDs._VolumeBounds, s_VisibleVolumeBoundsBuffer);
cmd.SetComputeBufferParam(m_VolumeVoxelizationCS, kernel, HDShaderIDs._VolumeData, s_VisibleVolumeDataBuffer);
cmd.SetComputeTextureParam(m_VolumeVoxelizationCS, kernel, HDShaderIDs._VolumeMaskAtlas, volumeAtlas);
// TODO: set the constant buffer data only once.
cmd.SetComputeMatrixParam(m_VolumeVoxelizationCS, HDShaderIDs._VBufferCoordToViewDirWS, transform);
cmd.SetComputeFloatParam(m_VolumeVoxelizationCS, HDShaderIDs._VBufferUnitDepthTexelSpacing, unitDepthTexelSpacing);
cmd.SetComputeIntParam(m_VolumeVoxelizationCS, HDShaderIDs._NumVisibleDensityVolumes, numVisibleVolumes);
cmd.SetComputeVectorParam(m_VolumeVoxelizationCS, HDShaderIDs._VolumeMaskDimensions, volumeAtlasDimensions);
int w = (int)resolution.x;
int h = (int)resolution.y;
// The shader defines GROUP_SIZE_1D = 8.
cmd.DispatchCompute(m_VolumeVoxelizationCS, kernel, (w + 7) / 8, (h + 7) / 8, hdCamera.computePassCount);
}
}
public void VolumetricLightingPass(HDCamera hdCamera, CommandBuffer cmd, uint frameIndex)
{
if (!hdCamera.frameSettings.enableVolumetrics)
{
return;
}
var visualEnvironment = VolumeManager.instance.stack.GetComponent <VisualEnvironment>();
if (visualEnvironment.fogType.value != FogType.Volumetric)
{
return;
}
using (new ProfilingSample(cmd, "Volumetric Lighting"))
{
// Only available in the Play Mode because all the frame counters in the Edit Mode are broken.
bool highQuality = preset == VolumetricLightingPreset.High;
bool enableClustered = hdCamera.frameSettings.lightLoopSettings.enableTileAndCluster;
bool enableReprojection = Application.isPlaying && hdCamera.camera.cameraType == CameraType.Game &&
hdCamera.frameSettings.enableReprojectionForVolumetrics;
int kernel;
if (highQuality)
{
if (enableReprojection)
{
kernel = m_VolumetricLightingCS.FindKernel(enableClustered ? "VolumetricLightingClusteredReprojHQ"
: "VolumetricLightingBruteforceReprojHQ");
}
else
{
kernel = m_VolumetricLightingCS.FindKernel(enableClustered ? "VolumetricLightingClusteredHQ"
: "VolumetricLightingBruteforceHQ");
}
}
else
{
if (enableReprojection)
{
kernel = m_VolumetricLightingCS.FindKernel(enableClustered ? "VolumetricLightingClusteredReprojMQ"
: "VolumetricLightingBruteforceReprojMQ");
}
else
{
kernel = m_VolumetricLightingCS.FindKernel(enableClustered ? "VolumetricLightingClusteredMQ"
: "VolumetricLightingBruteforceMQ");
}
}
var currFrameParams = hdCamera.vBufferParams[0];
var cvp = currFrameParams.viewportSize;
Vector4 resolution = new Vector4(cvp.x, cvp.y, 1.0f / cvp.x, 1.0f / cvp.y);
float vFoV = hdCamera.camera.fieldOfView * Mathf.Deg2Rad;
// Compose the matrix which allows us to compute the world space view direction.
Matrix4x4 transform = HDUtils.ComputePixelCoordToWorldSpaceViewDirectionMatrix(vFoV, resolution, hdCamera.viewMatrix, false);
GetHexagonalClosePackedSpheres7(m_xySeq);
int sampleIndex = (int)frameIndex % 7;
// TODO: should we somehow reorder offsets in Z based on the offset in XY? S.t. the samples more evenly cover the domain.
// Currently, we assume that they are completely uncorrelated, but maybe we should correlate them somehow.
m_xySeqOffset.Set(m_xySeq[sampleIndex].x, m_xySeq[sampleIndex].y, m_zSeq[sampleIndex], frameIndex);
// Get the interpolated anisotropy value.
var fog = VolumeManager.instance.stack.GetComponent <VolumetricFog>();
// TODO: set 'm_VolumetricLightingPreset'.
// TODO: set the constant buffer data only once.
cmd.SetComputeMatrixParam(m_VolumetricLightingCS, HDShaderIDs._VBufferCoordToViewDirWS, transform);
cmd.SetComputeVectorParam(m_VolumetricLightingCS, HDShaderIDs._VBufferSampleOffset, m_xySeqOffset);
cmd.SetComputeFloatParam(m_VolumetricLightingCS, HDShaderIDs._CornetteShanksConstant, CornetteShanksPhasePartConstant(fog.anisotropy));
cmd.SetComputeTextureParam(m_VolumetricLightingCS, kernel, HDShaderIDs._VBufferDensity, m_DensityBufferHandle); // Read
cmd.SetComputeTextureParam(m_VolumetricLightingCS, kernel, HDShaderIDs._VBufferLightingIntegral, m_LightingBufferHandle); // Write
if (enableReprojection)
{
var historyRT = hdCamera.GetPreviousFrameRT((int)HDCameraFrameHistoryType.VolumetricLighting);
var feedbackRT = hdCamera.GetCurrentFrameRT((int)HDCameraFrameHistoryType.VolumetricLighting);
// Detect if the history buffer has been recreated or resized.
Vector3Int currentResolutionOfHistoryBuffer = new Vector3Int();
currentResolutionOfHistoryBuffer.x = historyRT.rt.width;
currentResolutionOfHistoryBuffer.y = historyRT.rt.height;
currentResolutionOfHistoryBuffer.z = historyRT.rt.volumeDepth;
cmd.SetComputeIntParam(m_VolumetricLightingCS, HDShaderIDs._VBufferLightingHistoryIsValid, hdCamera.volumetricHistoryIsValid ? 1 : 0);
cmd.SetComputeTextureParam(m_VolumetricLightingCS, kernel, HDShaderIDs._VBufferLightingHistory, historyRT); // Read
cmd.SetComputeTextureParam(m_VolumetricLightingCS, kernel, HDShaderIDs._VBufferLightingFeedback, feedbackRT); // Write
hdCamera.volumetricHistoryIsValid = true; // For the next frame...
}
int w = (int)resolution.x;
int h = (int)resolution.y;
// The shader defines GROUP_SIZE_1D = 8.
cmd.DispatchCompute(m_VolumetricLightingCS, kernel, (w + 7) / 8, (h + 7) / 8, 1);
}
}
public void VolumeVoxelizationPass(HDCamera hdCamera, CommandBuffer cmd, uint frameIndex, DensityVolumeList densityVolumes)
{
if (!hdCamera.frameSettings.enableVolumetrics)
{
return;
}
var visualEnvironment = VolumeManager.instance.stack.GetComponent <VisualEnvironment>();
if (visualEnvironment.fogType.value != FogType.Volumetric)
{
return;
}
using (new ProfilingSample(cmd, "Volume Voxelization"))
{
int numVisibleVolumes = m_VisibleVolumeBounds.Count;
bool highQuality = preset == VolumetricLightingPreset.High;
bool enableClustered = hdCamera.frameSettings.lightLoopSettings.enableTileAndCluster;
int kernel;
if (highQuality)
{
kernel = m_VolumeVoxelizationCS.FindKernel(enableClustered ? "VolumeVoxelizationClusteredHQ"
: "VolumeVoxelizationBruteforceHQ");
}
else
{
kernel = m_VolumeVoxelizationCS.FindKernel(enableClustered ? "VolumeVoxelizationClusteredMQ"
: "VolumeVoxelizationBruteforceMQ");
}
var currFrameParams = hdCamera.vBufferParams[0];
var cvp = currFrameParams.viewportSize;
Vector4 resolution = new Vector4(cvp.x, cvp.y, 1.0f / cvp.x, 1.0f / cvp.y);
float vFoV = hdCamera.camera.fieldOfView * Mathf.Deg2Rad;
// Compose the matrix which allows us to compute the world space view direction.
Matrix4x4 transform = HDUtils.ComputePixelCoordToWorldSpaceViewDirectionMatrix(vFoV, resolution, hdCamera.viewMatrix, false);
Texture3D volumeAtlas = DensityVolumeManager.manager.volumeAtlas.GetAtlas();
Vector4 volumeAtlasDimensions = new Vector4(0.0f, 0.0f, 0.0f, 0.0f);
if (volumeAtlas != null)
{
volumeAtlasDimensions.x = (float)volumeAtlas.width / volumeAtlas.depth; // 1 / number of textures
volumeAtlasDimensions.y = volumeAtlas.width;
volumeAtlasDimensions.z = volumeAtlas.depth;
volumeAtlasDimensions.w = Mathf.Log(volumeAtlas.width, 2); // Max LoD
}
else
{
volumeAtlas = CoreUtils.blackVolumeTexture;
}
cmd.SetComputeTextureParam(m_VolumeVoxelizationCS, kernel, HDShaderIDs._VBufferDensity, m_DensityBufferHandle);
cmd.SetComputeBufferParam(m_VolumeVoxelizationCS, kernel, HDShaderIDs._VolumeBounds, s_VisibleVolumeBoundsBuffer);
cmd.SetComputeBufferParam(m_VolumeVoxelizationCS, kernel, HDShaderIDs._VolumeData, s_VisibleVolumeDataBuffer);
cmd.SetComputeTextureParam(m_VolumeVoxelizationCS, kernel, HDShaderIDs._VolumeMaskAtlas, volumeAtlas);
// TODO: set the constant buffer data only once.
cmd.SetComputeMatrixParam(m_VolumeVoxelizationCS, HDShaderIDs._VBufferCoordToViewDirWS, transform);
cmd.SetComputeIntParam(m_VolumeVoxelizationCS, HDShaderIDs._NumVisibleDensityVolumes, numVisibleVolumes);
cmd.SetComputeVectorParam(m_VolumeVoxelizationCS, HDShaderIDs._VolumeMaskDimensions, volumeAtlasDimensions);
int w = (int)resolution.x;
int h = (int)resolution.y;
// The shader defines GROUP_SIZE_1D = 8.
cmd.DispatchCompute(m_VolumeVoxelizationCS, kernel, (w + 7) / 8, (h + 7) / 8, 1);
}
}
public void VolumetricLightingPass(HDCamera camera, CommandBuffer cmd, FrameSettings settings, uint frameIndex)
{
if (preset == VolumetricLightingPreset.Off)
{
return;
}
var visualEnvironment = VolumeManager.instance.stack.GetComponent <VisualEnvironment>();
if (visualEnvironment.fogType != FogType.Volumetric)
{
return;
}
VBuffer vBuffer = FindVBuffer(camera.GetViewID());
if (vBuffer == null)
{
return;
}
using (new ProfilingSample(cmd, "Volumetric Lighting"))
{
// Only available in the Play Mode because all the frame counters in the Edit Mode are broken.
bool enableClustered = settings.lightLoopSettings.enableTileAndCluster;
bool enableReprojection = Application.isPlaying && camera.camera.cameraType == CameraType.Game;
int kernel;
if (enableReprojection)
{
kernel = m_VolumetricLightingCS.FindKernel(enableClustered ? "VolumetricLightingClusteredReproj"
: "VolumetricLightingBruteforceReproj");
}
else
{
kernel = m_VolumetricLightingCS.FindKernel(enableClustered ? "VolumetricLightingClustered"
: "VolumetricLightingBruteforce");
}
var frameParams = vBuffer.GetParameters(frameIndex);
Vector4 resolution = frameParams.resolution;
float vFoV = camera.camera.fieldOfView * Mathf.Deg2Rad;
// Compose the matrix which allows us to compute the world space view direction.
Matrix4x4 transform = HDUtils.ComputePixelCoordToWorldSpaceViewDirectionMatrix(vFoV, resolution, camera.viewMatrix, false);
Vector2[] xySeq = GetHexagonalClosePackedSpheres7();
// This is a sequence of 7 equidistant numbers from 1/14 to 13/14.
// Each of them is the centroid of the interval of length 2/14.
// They've been rearranged in a sequence of pairs {small, large}, s.t. (small + large) = 1.
// That way, the running average position is close to 0.5.
// | 6 | 2 | 4 | 1 | 5 | 3 | 7 |
// | | | | o | | | |
// | | o | | x | | | |
// | | x | | x | | o | |
// | | x | o | x | | x | |
// | | x | x | x | o | x | |
// | o | x | x | x | x | x | |
// | x | x | x | x | x | x | o |
// | x | x | x | x | x | x | x |
float[] zSeq = { 7.0f / 14.0f, 3.0f / 14.0f, 11.0f / 14.0f, 5.0f / 14.0f, 9.0f / 14.0f, 1.0f / 14.0f, 13.0f / 14.0f };
int sampleIndex = (int)frameIndex % 7;
// TODO: should we somehow reorder offsets in Z based on the offset in XY? S.t. the samples more evenly cover the domain.
// Currently, we assume that they are completely uncorrelated, but maybe we should correlate them somehow.
Vector4 offset = new Vector4(xySeq[sampleIndex].x, xySeq[sampleIndex].y, zSeq[sampleIndex], frameIndex);
// Get the interpolated asymmetry value.
var fog = VolumeManager.instance.stack.GetComponent <VolumetricFog>();
// TODO: set 'm_VolumetricLightingPreset'.
// TODO: set the constant buffer data only once.
cmd.SetComputeMatrixParam(m_VolumetricLightingCS, HDShaderIDs._VBufferCoordToViewDirWS, transform);
cmd.SetComputeVectorParam(m_VolumetricLightingCS, HDShaderIDs._VBufferSampleOffset, offset);
cmd.SetComputeFloatParam(m_VolumetricLightingCS, HDShaderIDs._CornetteShanksConstant, CornetteShanksPhasePartConstant(fog.asymmetry));
cmd.SetComputeTextureParam(m_VolumetricLightingCS, kernel, HDShaderIDs._VBufferDensity, vBuffer.GetDensityBuffer()); // Read
cmd.SetComputeTextureParam(m_VolumetricLightingCS, kernel, HDShaderIDs._VBufferLightingIntegral, vBuffer.GetLightingIntegralBuffer()); // Write
if (enableReprojection)
{
cmd.SetComputeTextureParam(m_VolumetricLightingCS, kernel, HDShaderIDs._VBufferLightingFeedback, vBuffer.GetLightingFeedbackBuffer(frameIndex)); // Write
cmd.SetComputeTextureParam(m_VolumetricLightingCS, kernel, HDShaderIDs._VBufferLightingHistory, vBuffer.GetLightingHistoryBuffer(frameIndex)); // Read
}
int w = (int)resolution.x;
int h = (int)resolution.y;
// The shader defines GROUP_SIZE_1D = 8.
cmd.DispatchCompute(m_VolumetricLightingCS, kernel, (w + 7) / 8, (h + 7) / 8, 1);
}
}
public void VolumetricLightingPass(HDCamera camera, CommandBuffer cmd, FrameSettings frameSettings)
{
if (preset == VolumetricLightingPreset.Off)
{
return;
}
using (new ProfilingSample(cmd, "Volumetric Lighting"))
{
VBuffer vBuffer = FindVBuffer(camera.GetViewID());
Debug.Assert(vBuffer != null);
if (HomogeneousFog.GetGlobalFogComponent() == null)
{
// Clear the render target instead of running the shader.
// CoreUtils.SetRenderTarget(cmd, GetVBufferLightingIntegral(viewOffset), ClearFlag.Color, CoreUtils.clearColorAllBlack);
// return;
// Clearing 3D textures does not seem to work!
// Use the workaround by running the full shader with no volume.
}
bool enableClustered = frameSettings.lightLoopSettings.enableTileAndCluster;
bool enableReprojection = Application.isPlaying && camera.camera.cameraType == CameraType.Game;
int kernel;
if (enableReprojection)
{
// Only available in the Play Mode because all the frame counters in the Edit Mode are broken.
kernel = m_VolumetricLightingCS.FindKernel(enableClustered ? "VolumetricLightingClusteredReproj"
: "VolumetricLightingAllLightsReproj");
}
else
{
kernel = m_VolumetricLightingCS.FindKernel(enableClustered ? "VolumetricLightingClustered"
: "VolumetricLightingAllLights");
}
int w = 0, h = 0, d = 0;
Vector2 scale = ComputeVBufferResolutionAndScale(preset, (int)camera.screenSize.x, (int)camera.screenSize.y, ref w, ref h, ref d);
float vFoV = camera.camera.fieldOfView * Mathf.Deg2Rad;
// Compose the matrix which allows us to compute the world space view direction.
// Compute it using the scaled resolution to account for the visible area of the VBuffer.
Vector4 scaledRes = new Vector4(w * scale.x, h * scale.y, 1.0f / (w * scale.x), 1.0f / (h * scale.y));
Matrix4x4 transform = HDUtils.ComputePixelCoordToWorldSpaceViewDirectionMatrix(vFoV, scaledRes, camera.viewMatrix, false);
camera.SetupComputeShader(m_VolumetricLightingCS, cmd);
Vector2[] xySeq = GetHexagonalClosePackedSpheres7();
// This is a sequence of 7 equidistant numbers from 1/14 to 13/14.
// Each of them is the centroid of the interval of length 2/14.
// They've been rearranged in a sequence of pairs {small, large}, s.t. (small + large) = 1.
// That way, the running average position is close to 0.5.
// | 6 | 2 | 4 | 1 | 5 | 3 | 7 |
// | | | | o | | | |
// | | o | | x | | | |
// | | x | | x | | o | |
// | | x | o | x | | x | |
// | | x | x | x | o | x | |
// | o | x | x | x | x | x | |
// | x | x | x | x | x | x | o |
// | x | x | x | x | x | x | x |
float[] zSeq = { 7.0f / 14.0f, 3.0f / 14.0f, 11.0f / 14.0f, 5.0f / 14.0f, 9.0f / 14.0f, 1.0f / 14.0f, 13.0f / 14.0f };
int rfc = Time.renderedFrameCount;
int sampleIndex = rfc % 7;
Vector4 offset = new Vector4(xySeq[sampleIndex].x, xySeq[sampleIndex].y, zSeq[sampleIndex], rfc);
// TODO: set 'm_VolumetricLightingPreset'.
cmd.SetComputeVectorParam(m_VolumetricLightingCS, HDShaderIDs._VBufferSampleOffset, offset);
cmd.SetComputeMatrixParam(m_VolumetricLightingCS, HDShaderIDs._VBufferCoordToViewDirWS, transform);
cmd.SetComputeTextureParam(m_VolumetricLightingCS, kernel, HDShaderIDs._VBufferLightingIntegral, vBuffer.GetLightingIntegralBuffer()); // Write
if (enableReprojection)
{
cmd.SetComputeTextureParam(m_VolumetricLightingCS, kernel, HDShaderIDs._VBufferLightingFeedback, vBuffer.GetLightingFeedbackBuffer()); // Write
cmd.SetComputeTextureParam(m_VolumetricLightingCS, kernel, HDShaderIDs._VBufferLightingHistory, vBuffer.GetLightingHistoryBuffer()); // Read
}
// The shader defines GROUP_SIZE_1D = 16.
cmd.DispatchCompute(m_VolumetricLightingCS, kernel, (w + 15) / 16, (h + 15) / 16, 1);
}
}
public void VolumetricLightingPass(HDCamera camera, CommandBuffer cmd, FrameSettings settings)
{
if (preset == VolumetricLightingPreset.Off)
{
return;
}
using (new ProfilingSample(cmd, "Volumetric Lighting"))
{
var visualEnvironment = VolumeManager.instance.stack.GetComponent <VisualEnvironment>();
if (visualEnvironment.fogType != FogType.Volumetric)
{
// Clear the render target instead of running the shader.
// CoreUtils.SetRenderTarget(cmd, vBuffer.GetDensityBuffer(), ClearFlag.Color, CoreUtils.clearColorAllBlack);
// return;
// Clearing 3D textures does not seem to work!
// Use the workaround by running the full shader with 0 density.
}
VBuffer vBuffer = FindVBuffer(camera.GetViewID());
Debug.Assert(vBuffer != null);
// Only available in the Play Mode because all the frame counters in the Edit Mode are broken.
bool enableClustered = settings.lightLoopSettings.enableTileAndCluster;
bool enableReprojection = Application.isPlaying && camera.camera.cameraType == CameraType.Game;
int kernel;
if (enableReprojection)
{
kernel = m_VolumetricLightingCS.FindKernel(enableClustered ? "VolumetricLightingClusteredReproj"
: "VolumetricLightingBruteforceReproj");
}
else
{
kernel = m_VolumetricLightingCS.FindKernel(enableClustered ? "VolumetricLightingClustered"
: "VolumetricLightingBruteforce");
}
int w = 0, h = 0, d = 0;
vBuffer.GetResolution(ref w, ref h, ref d);
// Compose the matrix which allows us to compute the world space view direction.
float vFoV = camera.camera.fieldOfView * Mathf.Deg2Rad;
Vector4 resolution = new Vector4(w, h, 1.0f / w, 1.0f / h);
Matrix4x4 transform = HDUtils.ComputePixelCoordToWorldSpaceViewDirectionMatrix(vFoV, resolution, camera.viewMatrix, false);
Vector2[] xySeq = GetHexagonalClosePackedSpheres7();
// This is a sequence of 7 equidistant numbers from 1/14 to 13/14.
// Each of them is the centroid of the interval of length 2/14.
// They've been rearranged in a sequence of pairs {small, large}, s.t. (small + large) = 1.
// That way, the running average position is close to 0.5.
// | 6 | 2 | 4 | 1 | 5 | 3 | 7 |
// | | | | o | | | |
// | | o | | x | | | |
// | | x | | x | | o | |
// | | x | o | x | | x | |
// | | x | x | x | o | x | |
// | o | x | x | x | x | x | |
// | x | x | x | x | x | x | o |
// | x | x | x | x | x | x | x |
float[] zSeq = { 7.0f / 14.0f, 3.0f / 14.0f, 11.0f / 14.0f, 5.0f / 14.0f, 9.0f / 14.0f, 1.0f / 14.0f, 13.0f / 14.0f };
int rfc = Time.renderedFrameCount;
int sampleIndex = rfc % 7;
Vector4 offset = new Vector4(xySeq[sampleIndex].x, xySeq[sampleIndex].y, zSeq[sampleIndex], rfc);
// Get the interpolated asymmetry value.
var fog = VolumeManager.instance.stack.GetComponent <VolumetricFog>();
// TODO: set 'm_VolumetricLightingPreset'.
// TODO: set the constant buffer data only once.
cmd.SetComputeMatrixParam(m_VolumetricLightingCS, HDShaderIDs._VBufferCoordToViewDirWS, transform);
cmd.SetComputeVectorParam(m_VolumetricLightingCS, HDShaderIDs._VBufferSampleOffset, offset);
cmd.SetComputeFloatParam(m_VolumetricLightingCS, HDShaderIDs._CornetteShanksConstant, CornetteShanksPhasePartConstant(fog.asymmetry));
cmd.SetComputeTextureParam(m_VolumetricLightingCS, kernel, HDShaderIDs._VBufferDensity, vBuffer.GetDensityBuffer()); // Read
cmd.SetComputeTextureParam(m_VolumetricLightingCS, kernel, HDShaderIDs._VBufferLightingIntegral, vBuffer.GetLightingIntegralBuffer()); // Write
if (enableReprojection)
{
cmd.SetComputeTextureParam(m_VolumetricLightingCS, kernel, HDShaderIDs._VBufferLightingFeedback, vBuffer.GetLightingFeedbackBuffer()); // Write
cmd.SetComputeTextureParam(m_VolumetricLightingCS, kernel, HDShaderIDs._VBufferLightingHistory, vBuffer.GetLightingHistoryBuffer()); // Read
}
// The shader defines GROUP_SIZE_1D = 8.
cmd.DispatchCompute(m_VolumetricLightingCS, kernel, (w + 7) / 8, (h + 7) / 8, 1);
}
}
public void VolumetricLightingPass(HDCamera hdCamera, CommandBuffer cmd, uint frameIndex)
{
if (!hdCamera.frameSettings.IsEnabled(FrameSettingsField.Volumetrics))
{
return;
}
var visualEnvironment = VolumeManager.instance.stack.GetComponent <VisualEnvironment>();
if (visualEnvironment.fogType.value != FogType.Volumetric)
{
return;
}
using (new ProfilingSample(cmd, "Volumetric Lighting"))
{
// Get the interpolated anisotropy value.
var fog = VolumeManager.instance.stack.GetComponent <VolumetricFog>();
// Only available in the Play Mode because all the frame counters in the Edit Mode are broken.
bool tiledLighting = hdCamera.frameSettings.IsEnabled(FrameSettingsField.BigTilePrepass);
bool enableReprojection = Application.isPlaying && hdCamera.camera.cameraType == CameraType.Game &&
hdCamera.frameSettings.IsEnabled(FrameSettingsField.ReprojectionForVolumetrics);
bool enableAnisotropy = fog.anisotropy.value != 0;
bool highQuality = preset == VolumetricLightingPreset.High;
int kernel = (tiledLighting ? 1 : 0) | (enableReprojection ? 2 : 0) | (enableAnisotropy ? 4 : 0) | (highQuality ? 8 : 0);
var currFrameParams = hdCamera.vBufferParams[0];
var cvp = currFrameParams.viewportSize;
Vector4 resolution = new Vector4(cvp.x, cvp.y, 1.0f / cvp.x, 1.0f / cvp.y);
#if UNITY_2019_1_OR_NEWER
var vFoV = hdCamera.camera.GetGateFittedFieldOfView() * Mathf.Deg2Rad;
var lensShift = hdCamera.camera.GetGateFittedLensShift();
#else
var vFoV = hdCamera.camera.fieldOfView * Mathf.Deg2Rad;
var lensShift = Vector2.zero;
#endif
// Compose the matrix which allows us to compute the world space view direction.
Matrix4x4 transform = HDUtils.ComputePixelCoordToWorldSpaceViewDirectionMatrix(vFoV, lensShift, resolution, hdCamera.mainViewConstants.viewMatrix, false);
// Compute texel spacing at the depth of 1 meter.
float unitDepthTexelSpacing = HDUtils.ComputZPlaneTexelSpacing(1.0f, vFoV, resolution.y);
GetHexagonalClosePackedSpheres7(m_xySeq);
int sampleIndex = (int)frameIndex % 7;
// TODO: should we somehow reorder offsets in Z based on the offset in XY? S.t. the samples more evenly cover the domain.
// Currently, we assume that they are completely uncorrelated, but maybe we should correlate them somehow.
m_xySeqOffset.Set(m_xySeq[sampleIndex].x, m_xySeq[sampleIndex].y, m_zSeq[sampleIndex], frameIndex);
// TODO: set 'm_VolumetricLightingPreset'.
// TODO: set the constant buffer data only once.
cmd.SetComputeMatrixParam(m_VolumetricLightingCS, HDShaderIDs._VBufferCoordToViewDirWS, transform);
cmd.SetComputeFloatParam(m_VolumetricLightingCS, HDShaderIDs._VBufferUnitDepthTexelSpacing, unitDepthTexelSpacing);
cmd.SetComputeFloatParam(m_VolumetricLightingCS, HDShaderIDs._CornetteShanksConstant, CornetteShanksPhasePartConstant(fog.anisotropy.value));
cmd.SetComputeVectorParam(m_VolumetricLightingCS, HDShaderIDs._VBufferSampleOffset, m_xySeqOffset);
cmd.SetComputeTextureParam(m_VolumetricLightingCS, kernel, HDShaderIDs._VBufferDensity, m_DensityBufferHandle); // Read
cmd.SetComputeTextureParam(m_VolumetricLightingCS, kernel, HDShaderIDs._VBufferLightingIntegral, m_LightingBufferHandle); // Write
if (enableReprojection)
{
var historyRT = hdCamera.GetPreviousFrameRT((int)HDCameraFrameHistoryType.VolumetricLighting);
var feedbackRT = hdCamera.GetCurrentFrameRT((int)HDCameraFrameHistoryType.VolumetricLighting);
cmd.SetComputeIntParam(m_VolumetricLightingCS, HDShaderIDs._VBufferLightingHistoryIsValid, hdCamera.volumetricHistoryIsValid ? 1 : 0);
cmd.SetComputeTextureParam(m_VolumetricLightingCS, kernel, HDShaderIDs._VBufferLightingHistory, historyRT); // Read
cmd.SetComputeTextureParam(m_VolumetricLightingCS, kernel, HDShaderIDs._VBufferLightingFeedback, feedbackRT); // Write
hdCamera.volumetricHistoryIsValid = true; // For the next frame...
}
int w = (int)resolution.x;
int h = (int)resolution.y;
// The shader defines GROUP_SIZE_1D = 8.
cmd.DispatchCompute(m_VolumetricLightingCS, kernel, (w + 7) / 8, (h + 7) / 8, hdCamera.computePassCount);
}
}
public void VolumeVoxelizationPass(DensityVolumeList densityVolumes, HDCamera camera, CommandBuffer cmd, FrameSettings settings, uint frameIndex)
{
if (preset == VolumetricLightingPreset.Off)
{
return;
}
var visualEnvironment = VolumeManager.instance.stack.GetComponent <VisualEnvironment>();
if (visualEnvironment.fogType != FogType.Volumetric)
{
return;
}
VBuffer vBuffer = FindVBuffer(camera.GetViewID());
if (vBuffer == null)
{
return;
}
using (new ProfilingSample(cmd, "Volume Voxelization"))
{
int numVisibleVolumes = m_VisibleVolumeBounds.Count;
if (numVisibleVolumes == 0)
{
// Clear the render target instead of running the shader.
// Note: the clear must take the global fog into account!
// CoreUtils.SetRenderTarget(cmd, vBuffer.GetDensityBuffer(), ClearFlag.Color, CoreUtils.clearColorAllBlack);
// return;
// Clearing 3D textures does not seem to work!
// Use the workaround by running the full shader with 0 density
}
bool enableClustered = settings.lightLoopSettings.enableTileAndCluster;
int kernel = m_VolumeVoxelizationCS.FindKernel(enableClustered ? "VolumeVoxelizationClustered"
: "VolumeVoxelizationBruteforce");
var frameParams = vBuffer.GetParameters(frameIndex);
Vector4 resolution = frameParams.resolution;
float vFoV = camera.camera.fieldOfView * Mathf.Deg2Rad;
// Compose the matrix which allows us to compute the world space view direction.
Matrix4x4 transform = HDUtils.ComputePixelCoordToWorldSpaceViewDirectionMatrix(vFoV, resolution, camera.viewMatrix, false);
Texture3D volumeAtlas = DensityVolumeManager.manager.volumeAtlas.volumeAtlas;
Vector2 volumeAtlasDimensions = new Vector2(0.0f, 0.0f);
if (volumeAtlas != null)
{
volumeAtlasDimensions.x = volumeAtlas.width / volumeAtlas.depth; // 1 / number of textures
volumeAtlasDimensions.y = 1.0f / volumeAtlas.width;
}
cmd.SetComputeTextureParam(m_VolumeVoxelizationCS, kernel, HDShaderIDs._VBufferDensity, vBuffer.GetDensityBuffer());
cmd.SetComputeBufferParam(m_VolumeVoxelizationCS, kernel, HDShaderIDs._VolumeBounds, s_VisibleVolumeBoundsBuffer);
cmd.SetComputeBufferParam(m_VolumeVoxelizationCS, kernel, HDShaderIDs._VolumeData, s_VisibleVolumeDataBuffer);
cmd.SetComputeTextureParam(m_VolumeVoxelizationCS, kernel, HDShaderIDs._VolumeMaskAtlas, volumeAtlas);
// TODO: set the constant buffer data only once.
cmd.SetComputeMatrixParam(m_VolumeVoxelizationCS, HDShaderIDs._VBufferCoordToViewDirWS, transform);
cmd.SetComputeIntParam(m_VolumeVoxelizationCS, HDShaderIDs._NumVisibleDensityVolumes, numVisibleVolumes);
cmd.SetComputeVectorParam(m_VolumeVoxelizationCS, HDShaderIDs._VolumeMaskDimensions, volumeAtlasDimensions);
int w = (int)resolution.x;
int h = (int)resolution.y;
// The shader defines GROUP_SIZE_1D = 8.
cmd.DispatchCompute(m_VolumeVoxelizationCS, kernel, (w + 7) / 8, (h + 7) / 8, 1);
}
}
public void VolumetricLightingPass(HDCamera hdCamera, CommandBuffer cmd, uint frameIndex)
{
if (!hdCamera.frameSettings.enableVolumetrics)
{
return;
}
var visualEnvironment = VolumeManager.instance.stack.GetComponent <VisualEnvironment>();
if (visualEnvironment.fogType.value != FogType.Volumetric)
{
return;
}
using (new ProfilingSample(cmd, "Volumetric Lighting"))
{
// Only available in the Play Mode because all the frame counters in the Edit Mode are broken.
bool highQuality = preset == VolumetricLightingPreset.High;
bool enableClustered = hdCamera.frameSettings.lightLoopSettings.enableTileAndCluster;
bool enableReprojection = Application.isPlaying && hdCamera.camera.cameraType == CameraType.Game;
int kernel;
if (highQuality)
{
if (enableReprojection)
{
kernel = m_VolumetricLightingCS.FindKernel(enableClustered ? "VolumetricLightingClusteredReprojHQ"
: "VolumetricLightingBruteforceReprojHQ");
}
else
{
kernel = m_VolumetricLightingCS.FindKernel(enableClustered ? "VolumetricLightingClusteredHQ"
: "VolumetricLightingBruteforceHQ");
}
}
else
{
if (enableReprojection)
{
kernel = m_VolumetricLightingCS.FindKernel(enableClustered ? "VolumetricLightingClusteredReprojMQ"
: "VolumetricLightingBruteforceReprojMQ");
}
else
{
kernel = m_VolumetricLightingCS.FindKernel(enableClustered ? "VolumetricLightingClusteredMQ"
: "VolumetricLightingBruteforceMQ");
}
}
var frameParams = hdCamera.vBufferParams[0];
Vector4 resolution = frameParams.resolution;
float vFoV = hdCamera.camera.fieldOfView * Mathf.Deg2Rad;
// Compose the matrix which allows us to compute the world space view direction.
Matrix4x4 transform = HDUtils.ComputePixelCoordToWorldSpaceViewDirectionMatrix(vFoV, resolution, hdCamera.viewMatrix, false);
Vector2[] xySeq = GetHexagonalClosePackedSpheres7();
// This is a sequence of 7 equidistant numbers from 1/14 to 13/14.
// Each of them is the centroid of the interval of length 2/14.
// They've been rearranged in a sequence of pairs {small, large}, s.t. (small + large) = 1.
// That way, the running average position is close to 0.5.
// | 6 | 2 | 4 | 1 | 5 | 3 | 7 |
// | | | | o | | | |
// | | o | | x | | | |
// | | x | | x | | o | |
// | | x | o | x | | x | |
// | | x | x | x | o | x | |
// | o | x | x | x | x | x | |
// | x | x | x | x | x | x | o |
// | x | x | x | x | x | x | x |
float[] zSeq = { 7.0f / 14.0f, 3.0f / 14.0f, 11.0f / 14.0f, 5.0f / 14.0f, 9.0f / 14.0f, 1.0f / 14.0f, 13.0f / 14.0f };
int sampleIndex = (int)frameIndex % 7;
// TODO: should we somehow reorder offsets in Z based on the offset in XY? S.t. the samples more evenly cover the domain.
// Currently, we assume that they are completely uncorrelated, but maybe we should correlate them somehow.
Vector4 offset = new Vector4(xySeq[sampleIndex].x, xySeq[sampleIndex].y, zSeq[sampleIndex], frameIndex);
// Get the interpolated anisotropy value.
var fog = VolumeManager.instance.stack.GetComponent <VolumetricFog>();
// TODO: set 'm_VolumetricLightingPreset'.
// TODO: set the constant buffer data only once.
cmd.SetComputeMatrixParam(m_VolumetricLightingCS, HDShaderIDs._VBufferCoordToViewDirWS, transform);
cmd.SetComputeVectorParam(m_VolumetricLightingCS, HDShaderIDs._VBufferSampleOffset, offset);
cmd.SetComputeFloatParam(m_VolumetricLightingCS, HDShaderIDs._CornetteShanksConstant, CornetteShanksPhasePartConstant(fog.anisotropy));
cmd.SetComputeTextureParam(m_VolumetricLightingCS, kernel, HDShaderIDs._VBufferDensity, m_DensityBufferHandle); // Read
cmd.SetComputeTextureParam(m_VolumetricLightingCS, kernel, HDShaderIDs._VBufferLightingIntegral, m_LightingBufferHandle); // Write
if (enableReprojection)
{
var historyRT = hdCamera.GetPreviousFrameRT((int)HDCameraFrameHistoryType.VolumetricLighting);
var feedbackRT = hdCamera.GetCurrentFrameRT((int)HDCameraFrameHistoryType.VolumetricLighting);
// Detect if the history buffer has been recreated or resized.
Vector3Int currentResolutionOfHistoryBuffer = new Vector3Int();
currentResolutionOfHistoryBuffer.x = historyRT.rt.width;
currentResolutionOfHistoryBuffer.y = historyRT.rt.height;
currentResolutionOfHistoryBuffer.z = historyRT.rt.volumeDepth;
// We allow downsizing, as this does not cause a reallocation.
bool validHistory = (currentResolutionOfHistoryBuffer.x <= m_PreviousResolutionOfHistoryBuffer.x &&
currentResolutionOfHistoryBuffer.y <= m_PreviousResolutionOfHistoryBuffer.y &&
currentResolutionOfHistoryBuffer.z <= m_PreviousResolutionOfHistoryBuffer.z);
cmd.SetComputeIntParam(m_VolumetricLightingCS, HDShaderIDs._VBufferLightingHistoryIsValid, validHistory ? 1 : 0);
cmd.SetComputeTextureParam(m_VolumetricLightingCS, kernel, HDShaderIDs._VBufferLightingHistory, historyRT); // Read
cmd.SetComputeTextureParam(m_VolumetricLightingCS, kernel, HDShaderIDs._VBufferLightingFeedback, feedbackRT); // Write
m_PreviousResolutionOfHistoryBuffer = currentResolutionOfHistoryBuffer;
}
int w = (int)resolution.x;
int h = (int)resolution.y;
// The shader defines GROUP_SIZE_1D = 8.
cmd.DispatchCompute(m_VolumetricLightingCS, kernel, (w + 7) / 8, (h + 7) / 8, 1);
}
}
