VolumeVoxelizationParameters PrepareVolumeVoxelizationParameters(HDCamera hdCamera)
{
var parameters = new VolumeVoxelizationParameters();
parameters.viewCount = hdCamera.viewCount;
parameters.numBigTileX = GetNumTileBigTileX(hdCamera);
parameters.numBigTileY = GetNumTileBigTileY(hdCamera);
parameters.tiledLighting = HasLightToCull() && hdCamera.frameSettings.IsEnabled(FrameSettingsField.BigTilePrepass);
bool highQuality = volumetricLightingPreset == VolumetricLightingPreset.High;
parameters.voxelizationCS = m_VolumeVoxelizationCS;
parameters.voxelizationKernel = (parameters.tiledLighting ? 1 : 0) | (highQuality ? 2 : 0);
var currFrameParams = hdCamera.vBufferParams[0];
var cvp = currFrameParams.viewportSize;
parameters.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;
#else
var vFoV = hdCamera.camera.fieldOfView * Mathf.Deg2Rad;
#endif
// Compose the matrix which allows us to compute the world space view direction.
hdCamera.GetPixelCoordToViewDirWS(parameters.resolution, ref m_PixelCoordToViewDirWS);
parameters.pixelCoordToViewDirWS = m_PixelCoordToViewDirWS;
// Compute texel spacing at the depth of 1 meter.
parameters.unitDepthTexelSpacing = HDUtils.ComputZPlaneTexelSpacing(1.0f, vFoV, parameters.resolution.y);
parameters.numVisibleVolumes = m_VisibleVolumeBounds.Count;
parameters.volumeAtlas = DensityVolumeManager.manager.volumeAtlas.GetAtlas();
parameters.volumeAtlasDimensions = new Vector4(0.0f, 0.0f, 0.0f, 0.0f);
if (parameters.volumeAtlas != null)
{
parameters.volumeAtlasDimensions.x = (float)parameters.volumeAtlas.width / parameters.volumeAtlas.depth; // 1 / number of textures
parameters.volumeAtlasDimensions.y = parameters.volumeAtlas.width;
parameters.volumeAtlasDimensions.z = parameters.volumeAtlas.depth;
parameters.volumeAtlasDimensions.w = Mathf.Log(parameters.volumeAtlas.width, 2); // Max LoD
}
else
{
parameters.volumeAtlas = CoreUtils.blackVolumeTexture;
}
return(parameters);
}
