public override void GenerateShader(MaterialGeneratorContext context)
{
if (NormalMap != null)
{
// Inform the context that we are using matNormal (from the MaterialSurfaceNormalMap shader)
context.UseStreamWithCustomBlend(MaterialShaderStage.Pixel, NormalStream.Stream, new ShaderClassSource("MaterialStreamNormalBlend"));
context.Parameters.Set(MaterialKeys.HasNormalMap, true);
var normalMap = NormalMap;
// Workaround to make sure that normal map are setup
var computeTextureColor = normalMap as ComputeTextureColor;
if (computeTextureColor != null)
{
if (computeTextureColor.FallbackValue.Value == Color.White)
{
computeTextureColor.FallbackValue.Value = DefaultNormalColor;
}
}
else
{
var computeColor = normalMap as ComputeColor;
if (computeColor != null)
{
if (computeColor.Value == Color.Black || computeColor.Value == Color.White)
{
computeColor.Value = DefaultNormalColor;
}
}
else
{
var computeFloat4 = normalMap as ComputeFloat4;
if (computeFloat4 != null)
{
if (computeFloat4.Value == Vector4.Zero)
{
computeFloat4.Value = DefaultNormalColor.ToVector4();
}
}
}
}
var computeColorSource = NormalMap.GenerateShaderSource(context, new MaterialComputeColorKeys(MaterialKeys.NormalMap, MaterialKeys.NormalValue, DefaultNormalColor, false));
var mixin = new ShaderMixinSource();
mixin.Mixins.Add(new ShaderClassSource("MaterialSurfaceNormalMap", IsXYNormal, ScaleAndBias));
mixin.AddComposition("normalMap", computeColorSource);
context.AddShaderSource(MaterialShaderStage.Pixel, mixin);
}
}
private void AddClearCoatNormalMap(MaterialGeneratorContext context)
{
var computeColorKeys = new MaterialComputeColorKeys(MaterialKeys.NormalMap, MaterialKeys.NormalValue, MaterialNormalMapFeature.DefaultNormalColor, false);
var computeColorSource = OrangePeelNormalMap.GenerateShaderSource(context, computeColorKeys);
// Orange Peel Normal Map
var mixinNormalMap = new ShaderMixinSource();
// Inform the context that we are using matNormal (from the MaterialSurfaceNormalMap shader)
context.UseStreamWithCustomBlend(MaterialShaderStage.Pixel, "matNormal", new ShaderClassSource("MaterialStreamNormalBlend"));
context.Parameters.Set(MaterialKeys.HasNormalMap, true);
mixinNormalMap.Mixins.Add(new ShaderClassSource("MaterialSurfaceNormalMap", OrangePeelIsXYNormal, OrangePeelScaleAndBias));
mixinNormalMap.AddComposition("normalMap", computeColorSource);
context.AddShaderSource(MaterialShaderStage.Pixel, mixinNormalMap);
}
public override void VisitFeature(MaterialGeneratorContext context)
{
if (DisplacementMap == null)
{
return;
}
var materialStage = (MaterialShaderStage)Stage;
// reset the displacement streams at the beginning of the stage
context.AddStreamInitializer(materialStage, "MaterialDisplacementStream");
// set the blending mode of displacement map to additive (and not default linear blending)
context.UseStreamWithCustomBlend(materialStage, DisplacementStream, new ShaderClassSource("MaterialStreamAdditiveBlend", DisplacementStream));
// build the displacement computer
var displacement = DisplacementMap;
if (ScaleAndBias) // scale and bias should be done by layer
{
displacement = new ComputeBinaryScalar(displacement, new ComputeFloat(2f), BinaryOperator.Multiply);
displacement = new ComputeBinaryScalar(displacement, new ComputeFloat(1f), BinaryOperator.Subtract);
}
displacement = new ComputeBinaryScalar(displacement, Intensity, BinaryOperator.Multiply);
// Workaround to inform compute colors that sampling is occurring from a vertex shader
context.IsNotPixelStage = materialStage != MaterialShaderStage.Pixel;
context.SetStream(materialStage, DisplacementStream, displacement, MaterialKeys.DisplacementMap, MaterialKeys.DisplacementValue);
context.IsNotPixelStage = false;
var scaleNormal = materialStage != MaterialShaderStage.Vertex;
var positionMember = materialStage == MaterialShaderStage.Vertex ? "Position" : "PositionWS";
var normalMember = materialStage == MaterialShaderStage.Vertex ? "meshNormal" : "normalWS";
context.SetStreamFinalModifier <MaterialDisplacementMapFeature>(materialStage, new ShaderClassSource("MaterialSurfaceDisplacement", positionMember, normalMember, scaleNormal));
}