public IEnumerable <EffectShaderPass> SetupShadersPermutationCaster(object permutationKey)
{
var shadowMapPermutation = (ShadowMap)permutationKey;
var shaderCaster = new ShaderClassSource("ShadowMapCasterBase");
for (int i = 0; i < shadowMapPermutation.LevelCount; ++i)
{
// Shadow caster
var shaderPass = new EffectShaderPass(shadowMapPermutation.Passes[i], "ShadowMap");
shaderPass.Parameters.AddSources(shadowMapPermutation.Passes[i].Parameters);
shaderPass.Shader = (ShaderMixinSource)mainShaderSource.Clone();
shaderPass.Macros.AddRange(mainShaderMacros);
shaderPass.Shader.Mixins.Add(shaderCaster);
yield return(shaderPass);
}
}