public override void GenerateShader(MaterialGeneratorContext context)
{
if (DiffuseMap != null)
{
Vector4 diffuseMin = Vector4.Zero;
Vector4 diffuseMax = Vector4.One;
DiffuseMap.ClampFloat4(ref diffuseMin, ref diffuseMax);
var computeColorSource = DiffuseMap.GenerateShaderSource(context, new MaterialComputeColorKeys(MaterialKeys.DiffuseMap, MaterialKeys.DiffuseValue, Color.White));
var mixin = new ShaderMixinSource();
mixin.Mixins.Add(new ShaderClassSource("MaterialSurfaceDiffuse"));
mixin.AddComposition("diffuseMap", computeColorSource);
context.UseStream(MaterialShaderStage.Pixel, DiffuseStream.Stream);
context.UseStream(MaterialShaderStage.Pixel, ColorBaseStream.Stream);
context.AddShaderSource(MaterialShaderStage.Pixel, mixin);
}
}
public void Visit(MaterialGeneratorContext context)
{
if (!Enabled)
{
return;
}
switch (context.Step)
{
case MaterialGeneratorStep.PassesEvaluation:
MultipassGeneration(context);
break;
case MaterialGeneratorStep.GenerateShader:
GenerateShader(context);
break;
}
}
public override void VisitFeature(MaterialGeneratorContext context)
{
base.VisitFeature(context);
if (HasAlreadyTessellationFeature)
{
return;
}
// set the tessellation method used enumeration
context.Material.TessellationMethod |= XenkoTessellationMethod.Flat;
// create and affect the shader source
var tessellationShader = new ShaderMixinSource();
tessellationShader.Mixins.Add(new ShaderClassSource("TessellationFlat"));
context.Parameters.Set(MaterialKeys.TessellationShader, tessellationShader);
}
public virtual void Visit(MaterialGeneratorContext context)
{
// If not enabled, or Material or BlendMap are null, skip this layer
if (!Enabled || Material == null || BlendMap == null || context.FindAsset == null)
{
return;
}
// Find the material from the reference
var material = context.FindAsset(Material) as IMaterialDescriptor;
if (material == null)
{
context.Log.Error($"Unable to find material [{Material}]");
return;
}
// Check that material is valid
var materialName = context.GetAssetFriendlyName(Material);
if (!context.PushMaterial(material, materialName))
{
return;
}
try
{
// TODO: Because we are not fully supporting Streams declaration in shaders, we have to workaround this limitation by using a dynamic shader (inline)
// Push a layer for the sub-material
context.PushOverrides(Overrides);
context.PushLayer(BlendMap);
// Generate the material shaders into the current context
material.Visit(context);
}
finally
{
// Pop the stack
context.PopLayer();
context.PopOverrides();
context.PopMaterial();
}
}
private void AddMetalFlakesGlossiness(MaterialGeneratorContext context)
{
var surfaceToEyeDistance = LODDistance.GenerateShaderSource(context, new MaterialComputeColorKeys(MaterialKeys.GlossinessMap, MaterialKeys.GlossinessValue, Color.White));
// Metal Flakes Glossiness Feature
context.UseStream(MaterialShaderStage.Pixel, "matGlossiness");
var baseGlossinessComputeColorMap = BasePaintGlossinessMap.GenerateShaderSource(context, new MaterialComputeColorKeys(MaterialKeys.GlossinessMap, MaterialKeys.GlossinessValue));
var mixinGlossiness = new ShaderMixinSource();
// Computes glossiness factor for the metal flakes layer (based on the eye to surface distance and the base glossiness value)
mixinGlossiness.Mixins.Add(new ShaderClassSource("MaterialSurfaceGlossinessMapMetalFlakes", BasePaintGlossinessInvert));
mixinGlossiness.AddComposition("glossinessMap", baseGlossinessComputeColorMap);
mixinGlossiness.AddComposition("surfaceToEyeDistanceFactor", surfaceToEyeDistance);
context.AddShaderSource(MaterialShaderStage.Pixel, mixinGlossiness);
}
private void AddMetalFlakesDiffuse(MaterialGeneratorContext context)
{
var surfaceToEyeDistance = LODDistance.GenerateShaderSource(context, new MaterialComputeColorKeys(MaterialKeys.GlossinessMap, MaterialKeys.GlossinessValue, Color.White));
// Diffuse Feature (interpolated by the 'regular' diffuse map)
var metalFlakesComputeColorSource = MetalFlakesDiffuseMap.GenerateShaderSource(context, new MaterialComputeColorKeys(MaterialKeys.DiffuseMap, MaterialKeys.DiffuseValue, Color.White));
var mixinDiffuse = new ShaderMixinSource();
// Diffuse uses a custom shader (to perform the interpolation)
mixinDiffuse.Mixins.Add(new ShaderClassSource("MaterialSurfaceDiffuseMetalFlakes"));
mixinDiffuse.AddComposition("diffuseMap", metalFlakesComputeColorSource);
mixinDiffuse.AddComposition("surfaceToEyeDistanceFactor", surfaceToEyeDistance);
context.UseStream(MaterialShaderStage.Pixel, MaterialDiffuseMapFeature.DiffuseStream.Stream);
context.UseStream(MaterialShaderStage.Pixel, MaterialDiffuseMapFeature.ColorBaseStream.Stream);
context.AddShaderSource(MaterialShaderStage.Pixel, mixinDiffuse);
}
public override void VisitFeature(MaterialGeneratorContext context)
{
var alpha = Alpha ?? new ComputeFloat(1f);
var tint = Tint ?? new ComputeColor(Color.White);
// Use pre-multiplied alpha to support both additive and alpha blending
var blendDesc = new BlendStateDescription(Blend.One, Blend.InverseSourceAlpha);
context.Material.HasTransparency = true;
context.Parameters.Set(Effect.BlendStateKey, BlendState.NewFake(blendDesc));
context.SetStream(AlphaBlendStream.Stream, alpha, MaterialKeys.DiffuseSpecularAlphaBlendMap, MaterialKeys.DiffuseSpecularAlphaBlendValue, Color.White);
context.SetStream(AlphaBlendColorStream.Stream, tint, MaterialKeys.AlphaBlendColorMap, MaterialKeys.AlphaBlendColorValue, Color.White);
if (!context.Tags.Get(HasFinalCallback))
{
context.Tags.Set(HasFinalCallback, true);
context.AddFinalCallback(MaterialShaderStage.Pixel, AddDiffuseSpecularAlphaBlendColor);
}
}
public override void GenerateShader(MaterialGeneratorContext context)
{
// Exclude ambient occlusion from uv-scale overrides
var revertOverrides = new MaterialOverrides();
revertOverrides.UVScale = 1.0f / context.CurrentOverrides.UVScale;
context.PushOverrides(revertOverrides);
context.SetStream(OcclusionStream.Stream, AmbientOcclusionMap, MaterialKeys.AmbientOcclusionMap, MaterialKeys.AmbientOcclusionValue, Color.White);
context.PopOverrides();
context.SetStream("matAmbientOcclusionDirectLightingFactor", DirectLightingFactor, null, MaterialKeys.AmbientOcclusionDirectLightingFactorValue);
if (CavityMap != null)
{
context.SetStream(CavityStream.Stream, CavityMap, MaterialKeys.CavityMap, MaterialKeys.CavityValue, Color.White);
context.SetStream("matCavityDiffuse", DiffuseCavity, null, MaterialKeys.CavityDiffuseValue);
context.SetStream("matCavitySpecular", SpecularCavity, null, MaterialKeys.CavitySpecularValue);
}
}
/// <summary>
/// Initializes a new instance of <see cref="MaterialBlendLayerContext"/>.
/// </summary>
/// <param name="context">The material generator context</param>
/// <param name="parentLayerContext">The parent layer context</param>
/// <param name="blendMap">The blend map used for this layer</param>
public MaterialBlendLayerContext(MaterialGeneratorContext context, MaterialBlendLayerContext parentLayerContext, IComputeScalar blendMap)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
Context = context;
Parent = parentLayerContext;
BlendMap = blendMap;
Children = new List <MaterialBlendLayerContext>();
ShadingModels = new MaterialShadingModelCollection();
ContextPerStage = new Dictionary <MaterialShaderStage, MaterialBlendLayerPerStageContext>();
foreach (MaterialShaderStage stage in Enum.GetValues(typeof(MaterialShaderStage)))
{
ContextPerStage[stage] = new MaterialBlendLayerPerStageContext();
}
PendingPixelLayerContext = new MaterialBlendLayerPerStageContext();
}
public override void GenerateShader(MaterialGeneratorContext context)
{
base.GenerateShader(context);
var attributes = context.CurrentMaterialDescriptor.Attributes;
int glassPassIndex = context.PassIndex % 2;
if (attributes.CullMode == CullMode.None)
{
context.MaterialPass.CullMode = context.PassIndex < 2 ? CullMode.Back : CullMode.Front;
}
else
{
context.MaterialPass.CullMode = attributes.CullMode;
}
// Compute transmittance
context.GetShading(this).LightDependentExtraModels.Add(new ShaderClassSource("MaterialTransmittanceReflectanceStream"));
context.Parameters.Set(MaterialTransmittanceReflectanceStreamKeys.RefractiveIndex, RefractiveIndex);
context.MaterialPass.HasTransparency = true;
if (glassPassIndex == 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 (glassPassIndex == 1)
{
// Reflectance pass
context.MaterialPass.BlendState = BlendStates.Additive;
}
}
protected virtual void GenerateShaderCompositions(MaterialGeneratorContext context, ShaderMixinSource shaderSource)
{
if (Fresnel != null)
{
shaderSource.AddComposition("fresnelFunction", Fresnel.Generate(context));
}
if (Visibility != null)
{
shaderSource.AddComposition("geometricShadowingFunction", Visibility.Generate(context));
}
if (NormalDistribution != null)
{
shaderSource.AddComposition("normalDistributionFunction", NormalDistribution.Generate(context));
}
if (Environment != null)
{
shaderSource.AddComposition("environmentFunction", Environment.Generate(context));
}
}
public override void VisitFeature(MaterialGeneratorContext context)
{
var shaderSource = new ShaderMixinSource();
shaderSource.Mixins.Add(new ShaderClassSource("MaterialSurfaceShadingSpecularMicrofacet"));
if (Fresnel != null)
{
shaderSource.AddComposition("fresnelFunction", Fresnel.Generate());
}
if (Visibility != null)
{
shaderSource.AddComposition("geometricShadowingFunction", Visibility.Generate());
}
if (NormalDistribution != null)
{
shaderSource.AddComposition("normalDistributionFunction", NormalDistribution.Generate());
}
context.AddShading(this, shaderSource);
}
public override void VisitFeature(MaterialGeneratorContext context)
{
base.VisitFeature(context);
if (HasAlreadyTessellationFeature)
{
return;
}
// set the tessellation method used enumeration
context.Material.TessellationMethod |= XenkoTessellationMethod.PointNormal;
// create and affect the shader source
var tessellationShader = new ShaderMixinSource();
tessellationShader.Mixins.Add(new ShaderClassSource("TessellationPN"));
if (AdjacentEdgeAverage)
{
tessellationShader.Mixins.Add(new ShaderClassSource("TessellationAE4", "PositionWS"));
}
context.Parameters.Set(MaterialKeys.TessellationShader, tessellationShader);
}
public override void VisitFeature(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;
}
}
}
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);
}
}
public override void GenerateShader(MaterialGeneratorContext context)
{
// Make sure the parameters are not out of range
ClampInputs();
// Set the blend state for both pass
context.MaterialPass.BlendState = BlendStates.Additive;
var isMetalFlakesPass = (context.PassIndex == 0);
if (isMetalFlakesPass)
{
// Do the Base Paint first
AddBaseDiffuse(context);
AddBaseGlossiness(context);
// Then the Metal Flakes
AddMetalFlakesDiffuse(context);
AddMetalFlakesNormal(context);
AddMetalFlakesGlossiness(context);
AddMetalFlakesMetalness(context);
}
else
{
// TODO Add reflections desaturation for environment reflections?
// Ideally, this should be done on top of the regular specular model.
// Unfortunately, after some tests, it seems that overriding the ComputeEnvironmentLightContribution is the only way to do so
// Enable transparency for clear coat pass only
context.MaterialPass.HasTransparency = true;
AddClearCoatNormalMap(context);
AddClearCoatGlossinessMap(context);
AddClearCoatMetalnessMap(context);
}
}
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));
}
/// <summary> /// Generates the for the feature shader. /// </summary> /// <param name="context">The context.</param> public abstract void VisitFeature(MaterialGeneratorContext context);
public ShaderSource Generate(MaterialGeneratorContext context)
{
return(new ShaderClassSource("MaterialSpecularMicrofacetVisibilityNeumann"));
}
public ShaderSource Generate(MaterialGeneratorContext context)
{
return(new ShaderClassSource("MaterialSpecularMicrofacetNormalDistributionBlinnPhong"));
}
public ShaderSource Generate(MaterialGeneratorContext context)
{
return(new ShaderClassSource("MaterialSpecularMicrofacetEnvironmentGGXPolynomial"));
}
private void AddDiffuseSpecularAlphaBlendColor(MaterialShaderStage stage, MaterialGeneratorContext context)
{
context.AddShaderSource(MaterialShaderStage.Pixel, new ShaderClassSource("MaterialSurfaceDiffuseSpecularAlphaBlendColor"));
}
public static MaterialShaderResult Generate(MaterialDescriptor materialDescriptor, MaterialGeneratorContext context, string rootMaterialFriendlyName)
{
if (materialDescriptor == null)
{
throw new ArgumentNullException("materialDescriptor");
}
if (context == null)
{
throw new ArgumentNullException("context");
}
var result = new MaterialShaderResult();
context.Log = result;
var material = context.Material;
result.Material = context.Material;
context.Parameters = material.Parameters;
context.PushMaterial(materialDescriptor, rootMaterialFriendlyName);
context.PushLayer();
materialDescriptor.Visit(context);
context.PopLayer();
context.PopMaterial();
if (!material.Parameters.ContainsKey(MaterialKeys.TessellationShader))
{
material.Parameters.Set(MaterialKeys.TessellationShader, null);
}
material.Parameters.Set(MaterialKeys.VertexStageSurfaceShaders, context.GenerateSurfaceShader(MaterialShaderStage.Vertex));
material.Parameters.Set(MaterialKeys.DomainStageSurfaceShaders, context.GenerateSurfaceShader(MaterialShaderStage.Domain));
material.Parameters.Set(MaterialKeys.PixelStageSurfaceShaders, context.GenerateSurfaceShader(MaterialShaderStage.Pixel));
material.Parameters.Set(MaterialKeys.VertexStageStreamInitializer, context.GenerateStreamInitializer(MaterialShaderStage.Vertex));
material.Parameters.Set(MaterialKeys.DomainStageStreamInitializer, context.GenerateStreamInitializer(MaterialShaderStage.Domain));
material.Parameters.Set(MaterialKeys.PixelStageStreamInitializer, context.GenerateStreamInitializer(MaterialShaderStage.Pixel));
return(result);
}
public void Visit(MaterialGeneratorContext context)
{
if (!Enabled)
{
return;
}
// Push overrides of this attributes
context.PushOverrides(Overrides);
// Order is important, as some features are dependent on other
// (For example, Specular can depend on Diffuse in case of Metalness)
// We may be able to describe a dependency system here, but for now, assume
// that it won't change much so it is hardcoded
// If Specular has energy conservative, copy this to the diffuse lambertian model
// TODO: Should we apply it to any Diffuse Model?
var isEnergyConservative = (Specular as MaterialSpecularMapFeature)?.IsEnergyConservative ?? false;
var lambert = DiffuseModel as IEnergyConservativeDiffuseModelFeature;
if (lambert != null)
{
lambert.IsEnergyConservative = isEnergyConservative;
}
// Diffuse - these 2 features are always used as a pair
context.Visit(Diffuse);
if (Diffuse != null)
{
context.Visit(DiffuseModel);
}
// Surface Geometry
context.Visit(Tessellation);
context.Visit(Displacement);
context.Visit(Surface);
context.Visit(MicroSurface);
// Specular - these 2 features are always used as a pair
context.Visit(Specular);
if (Specular != null)
{
context.Visit(SpecularModel);
}
// Misc
context.Visit(Occlusion);
context.Visit(Emissive);
context.Visit(Transparency);
// Pop overrides
context.PopOverrides();
// Only set the cullmode to something
if (context.Step == MaterialGeneratorStep.GenerateShader && CullMode != CullMode.Back)
{
if (context.MaterialPass.CullMode == null)
{
context.MaterialPass.CullMode = CullMode;
}
}
}
public ShaderSource Generate(MaterialGeneratorContext context)
{
return(new ShaderClassSource("MaterialSpecularMicrofacetFresnelSchlick"));
}
private void AddDiscardFromLuminance(MaterialShaderStage stage, MaterialGeneratorContext context)
{
context.AddShaderSource(MaterialShaderStage.Pixel, new ShaderClassSource("MaterialSurfaceTransparentAlphaDiscard"));
}
public ShaderSource Generate(MaterialGeneratorContext context)
{
return(new ShaderClassSource("MaterialCelShadingLightDefault", IsBlackAndWhite));
}
public override void VisitFeature(MaterialGeneratorContext context)
{
var shaderSource = new ShaderClassSource("MaterialSurfaceShadingDiffuseLambert", IsEnergyConservative);
context.AddShading(this, shaderSource);
}
private void AddMaterialSurfaceTransmittanceShading(MaterialShaderStage stage, MaterialGeneratorContext context)
{
context.AddShaderSource(stage, new ShaderClassSource("MaterialSurfaceTransmittanceShading"));
}
public static MaterialShaderResult Generate(MaterialDescriptor materialDescriptor, MaterialGeneratorContext context, string rootMaterialFriendlyName)
{
if (materialDescriptor == null)
{
throw new ArgumentNullException("materialDescriptor");
}
if (context == null)
{
throw new ArgumentNullException("context");
}
var result = new MaterialShaderResult();
context.Log = result;
result.Material = context.Material;
context.PushMaterial(materialDescriptor, rootMaterialFriendlyName);
context.Step = MaterialGeneratorStep.PassesEvaluation;
materialDescriptor.Visit(context);
context.Step = MaterialGeneratorStep.GenerateShader;
for (int pass = 0; pass < context.PassCount; ++pass)
{
var materialPass = context.PushPass();
context.PushLayer(null);
materialDescriptor.Visit(context);
context.PopLayer();
materialPass.Parameters.Set(MaterialKeys.VertexStageSurfaceShaders, context.ComputeShaderSource(MaterialShaderStage.Vertex));
materialPass.Parameters.Set(MaterialKeys.DomainStageSurfaceShaders, context.ComputeShaderSource(MaterialShaderStage.Domain));
materialPass.Parameters.Set(MaterialKeys.PixelStageSurfaceShaders, context.ComputeShaderSource(MaterialShaderStage.Pixel));
materialPass.Parameters.Set(MaterialKeys.VertexStageStreamInitializer, context.GenerateStreamInitializers(MaterialShaderStage.Vertex));
materialPass.Parameters.Set(MaterialKeys.DomainStageStreamInitializer, context.GenerateStreamInitializers(MaterialShaderStage.Domain));
materialPass.Parameters.Set(MaterialKeys.PixelStageStreamInitializer, context.GenerateStreamInitializers(MaterialShaderStage.Pixel));
context.PopPass();
}
context.PopMaterial();
return(result);
}
public override void MultipassGeneration(MaterialGeneratorContext context)
{
const int passCount = 2;
context.SetMultiplePasses("ClearCoat", passCount);
}
