private void BlendShadingModel(MaterialBlendLayerContext parent, MaterialBlendLayerPerStageContext pendingPixelLayerContext, MaterialBlendLayerPerStageContext parentPixelLayerContext)
{
var shaderBlendingSource = new ShaderMixinSource();
shaderBlendingSource.Mixins.Add(new ShaderClassSource("MaterialSurfaceShadingBlend"));
parent.SetStreamBlend(MaterialShaderStage.Pixel, parent.BlendMapForShadingModel);
// Add shader source already setup for the parent
foreach (var shaderSource in pendingPixelLayerContext.ShaderSources)
{
shaderBlendingSource.AddCompositionToArray("layers", shaderSource);
}
// Add shader source generated for blending this layer
foreach (var shaderSource in parent.ShadingModels.Generate(this))
{
shaderBlendingSource.AddCompositionToArray("layers", shaderSource);
}
parent.ShadingModels.Clear();
parentPixelLayerContext.ShaderSources.Add(shaderBlendingSource);
pendingPixelLayerContext.Reset();
parent.BlendMapForShadingModel = null;
}
private void BlendStreams(MaterialBlendLayerContext layer)
{
// Generate Vertex and Pixel surface shaders
foreach (MaterialShaderStage stage in Enum.GetValues(typeof(MaterialShaderStage)))
{
// If we don't have any stream set, we have nothing to blend
var stageContext = layer.GetContextPerStage(stage);
if (stageContext.Streams.Count == 0)
{
continue;
}
// Blend setup for this layer
layer.SetStreamBlend(stage, layer.BlendMap);
// Generate a dynamic shader name
// Create a mixin
var shaderMixinSource = new ShaderMixinSource();
shaderMixinSource.Mixins.Add(new ShaderClassSource("MaterialSurfaceStreamsBlend"));
// Add all streams that we need to blend
foreach (var stream in stageContext.Streams)
{
shaderMixinSource.AddCompositionToArray("blends", GetStreamBlendShaderSource(stream));
}
stageContext.Streams.Clear();
// Squash all ShaderSources to a single shader source
var materialBlendLayerMixin = stageContext.ComputeShaderSource();
stageContext.ShaderSources.Clear();
// Add the shader to the mixin
shaderMixinSource.AddComposition("layer", materialBlendLayerMixin);
// Squash the shader sources
stageContext.ShaderSources.Add(shaderMixinSource);
}
}