public override void GenerateShader(MaterialGeneratorContext context)
{
base.GenerateShader(context);
// Compute transmittance
context.GetShading(this).LightDependentExtraModels.Add(new ShaderClassSource("MaterialTransmittanceReflectanceStream"));
context.Parameters.Set(MaterialTransmittanceReflectanceStreamKeys.RefractiveIndex, RefractiveIndex);
context.MaterialPass.HasTransparency = true;
if (context.PassIndex == 0)
{
// Transmittance pass
context.MaterialPass.BlendState = new BlendStateDescription(Blend.Zero, Blend.SourceColor)
{
RenderTarget0 = { AlphaSourceBlend = Blend.One, AlphaDestinationBlend = Blend.Zero }
};
// Shader output is matTransmittance
// Note: we make sure to run after MaterialTransparencyBlendFeature so that shadingColorAlpha is fully updated
context.AddFinalCallback(MaterialShaderStage.Pixel, AddMaterialSurfaceTransmittanceShading, MaterialTransparencyBlendFeature.ShadingColorAlphaFinalCallbackOrder + 1);
}
else if (context.PassIndex == 1)
{
// Reflectance pass
context.MaterialPass.BlendState = BlendStates.Additive;
}
}
