private uint AddMaterialToDictionaryAndGetArrayIndex(RenderMesh renderMesh, ref uint materialArrayIndexCounter)
{
// Fill the structure because the dictionary compares the contents for equality:
ScatteringParameters scatteringParameters = new ScatteringParameters(renderMesh.MaterialPass);
uint materialArrayIndex;
if (DeduplicateMaterialParameters)
{
// Since we deduplicate materials here, we must check whether or not we should add a material or not before doing so.
// If "TryGetValue()" succeeds, "materialArrayIndex" will receive the correct value. If it fails, it will be computed below.
if (!scatteringParametersToArrayIndexDictionary.TryGetValue(scatteringParameters, out materialArrayIndex)) // If the material isn't present in the collection:
{
AddMaterialToArrayAndDictionary(scatteringParameters, materialArrayIndexCounter);
materialArrayIndex = materialArrayIndexCounter++; // Use the index before the increment.
}
}
else
{
// Since we don't deduplicate materials here, we always add each material and increment the index.
AddMaterialToArrayAndDictionary(scatteringParameters, materialArrayIndexCounter);
materialArrayIndex = materialArrayIndexCounter++; // Use the index before the increment.
}
return(materialArrayIndex);
}
private void AddMaterialToArrayAndDictionary(ScatteringParameters scatteringParameters, uint materialArrayIndex)
{
// "SetScatteringWidth()" throws an exception if the range is exceeded. // TODO: How to handle this? Don't throw at all?
SubsurfaceScatteringBlurEffect.SetScatteringWidth(materialArrayIndex, scatteringParameters.ScatteringWidth); // Add the scattering width to the scattering width array.
if (scatteringParameters.ScatteringKernel != null)
{
// TODO: STABILITY: What to do if the scattering width is present but no kernel? The post-process wouldn't be able to handle that correctly.
// Maybe just save a dummy kernel?
SubsurfaceScatteringBlurEffect.SetScatteringKernel(materialArrayIndex, scatteringParameters.ScatteringKernel);
}
scatteringParametersToArrayIndexDictionary[scatteringParameters] = materialArrayIndex; // Add the material to the dictionary and save its associated index in the scattering width array.
}