public ShaderSource Generate(MaterialGeneratorContext context)
{
// Generate unique keys because this mixin can be used more than once per shader and we want their constants to be independent.
var uniqueHardnessReciprocalKey = (ValueParameterKey <float>)context.GetParameterKey(HardnessReciprocalParameterKey);
var uniqueBoundaryShiftKey = (ValueParameterKey <float>)context.GetParameterKey(BoundaryShiftParameterKey);
context.Parameters.Set(uniqueHardnessReciprocalKey, 1.0f / Hardness);
context.Parameters.Set(uniqueBoundaryShiftKey, BoundaryShift);
return(new ShaderClassSource("MaterialHairLightAttenuationFunctionDirectional", (int)SelectedNormalMode, uniqueHardnessReciprocalKey, uniqueBoundaryShiftKey));
}
public static void SetMaterialPassParameters(MaterialGeneratorContext context, ShaderMixinSource shaderSource, float alphaThreshold)
{
const string functionName = "hairDiscardFunction";
// Generate a key because the mixin can be used more than once per shader and therefore we want their constants to be independent.
var uniqueAlphaThresholdKey = (ValueParameterKey <float>)context.GetParameterKey(HairAlphaThresholdKey);
context.Parameters.Set(uniqueAlphaThresholdKey, alphaThreshold);
switch (context.PassIndex)
{
case (int)PassID.OpaqueBackAndFront:
context.MaterialPass.BlendState = BlendStates.Opaque; // Render as opaque.
context.MaterialPass.HasTransparency = false; // Render as opaque.
context.MaterialPass.CullMode = CullMode.None; // Render both faces
shaderSource.AddComposition(functionName, new MaterialHairDiscardFunctionOpaquePass().Generate(context, uniqueAlphaThresholdKey));
break;
case (int)PassID.TransparentBack:
context.MaterialPass.BlendState = BlendStates.NonPremultiplied; // TODO: Is this the correct blend mode?
context.MaterialPass.HasTransparency = true; // Render as a transparent.
context.MaterialPass.CullMode = CullMode.Front; // Only draw back faces.
shaderSource.AddComposition(functionName, new MaterialHairDiscardFunctionTransparentPass().Generate(context, uniqueAlphaThresholdKey));
break;
case (int)PassID.TransparentFront:
context.MaterialPass.BlendState = BlendStates.NonPremultiplied; // TODO: Is this the correct blend mode?
context.MaterialPass.HasTransparency = true; // Render as a transparent.
context.MaterialPass.CullMode = CullMode.Back; // Only draw front faces.
shaderSource.AddComposition(functionName, new MaterialHairDiscardFunctionTransparentPass().Generate(context, uniqueAlphaThresholdKey));
break;
}
}
public ShaderSource Generate(MaterialGeneratorContext context)
{
// Generate a unique key because this mixin can be used more than once per shader and we want their constants to be independent.
var uniqueExtinctionStrengthKey = (ValueParameterKey <float>)context.GetParameterKey(ExtinctionStrengthKey);
context.MaterialPass.Parameters.Set(uniqueExtinctionStrengthKey, ExtinctionStrength);
return(new ShaderClassSource("MaterialHairShadowingFunctionScattering", uniqueExtinctionStrengthKey));
}