public void GenerateNodeFunction(FunctionRegistry registry, GenerationMode generationMode)
{
// We may need ConvertEvToLuminance() so we include CommonLighting.hlsl
registry.RequiresIncludePath("Packages/com.unity.render-pipelines.core/ShaderLibrary/CommonLighting.hlsl");
registry.ProvideFunction(GetFunctionName(), s =>
{
s.AppendLine("$precision3 {0}($precision3 ldrColor, {1} luminanceIntensity, {1} exposureWeight)",
GetFunctionName(),
intensitySlot.concreteValueType.ToShaderString());
using (s.BlockScope())
{
if (normalizeColor.isOn)
{
s.AppendLine("ldrColor = ldrColor * rcp(max(Luminance(ldrColor), 1e-6));");
}
s.AppendLine("$precision3 hdrColor = ldrColor * luminanceIntensity;");
s.AppendNewLine();
s.AppendLine("#ifdef SHADERGRAPH_PREVIEW");
s.AppendLine($"$precision inverseExposureMultiplier = 1.0;");
s.AppendLine("#else");
s.AppendLine($"$precision inverseExposureMultiplier = GetInverseCurrentExposureMultiplier();");
s.AppendLine("#endif");
s.AppendNewLine();
s.AppendLine("// Inverse pre-expose using _EmissiveExposureWeight weight");
s.AppendLine("hdrColor = lerp(hdrColor * inverseExposureMultiplier, hdrColor, exposureWeight);");
s.AppendLine("return hdrColor;");
}
});
}
public void GenerateNodeFunction(FunctionRegistry registry, GenerationMode generationMode)
{
registry.RequiresIncludePath("Packages/com.unity.render-pipelines.core/ShaderLibrary/BSDF.hlsl");
string resultType = GetResultType();
registry.ProvideFunction(GetFunctionName(), s =>
{
if (m_FresnelEquationMode == FresnelEquationMode.Schlick)
{
s.AppendLine("void {0}(out {1} FresnelValue, $precision cos0, {1} f0)", GetFunctionName(), resultType, resultType);
}
else if (m_FresnelEquationMode == FresnelEquationMode.Dielectric)
{
s.AppendLine("void {0}(out {1} FresnelValue, $precision cos0, {2} iorSource, {3} iorMedium)",
GetFunctionName(),
resultType,
iorSourceInputSlot.concreteValueType.ToShaderString(),
iorMediumInputSlot.concreteValueType.ToShaderString());
}
else //if (m_FresnelEquationMode == FresnelEquationMode.DielectricGeneric)
{
s.AppendLine("void {0}(out {1} FresnelValue, $precision cos0, {2} iorSource, {3} iorMedium, {4} iorMediumK)",
GetFunctionName(),
resultType,
iorSourceInputSlot.concreteValueType.ToShaderString(),
iorMediumInputSlot.concreteValueType.ToShaderString(),
iorMediumKInputSlot.concreteValueType.ToShaderString());
}
using (s.BlockScope())
{
if (m_FresnelEquationMode == FresnelEquationMode.Schlick)
{
s.AppendLine("FresnelValue = F_Schlick(f0, cos0);");
}
else if (m_FresnelEquationMode == FresnelEquationMode.Dielectric)
{
s.AppendLine("FresnelValue = F_FresnelDielectric(iorMedium/iorSource, cos0);");
}
else //if (m_FresnelEquationMode == FresnelEquationMode.DielectricGeneric)
{
s.AppendLine("FresnelValue = F_FresnelConductor(iorMedium/iorSource, iorMediumK/iorSource, cos0);");
}
}
});
}
public void GenerateNodeFunction(FunctionRegistry registry, GenerationMode generationMode)
{
registry.RequiresIncludePath("Packages/com.unity.render-pipelines.core/ShaderLibrary/BSDF.hlsl");
registry.ProvideFunction(GetFunctionName(), s =>
{
s.AppendLine("void {0}(out $precision3 Refracted, out $precision3 Intensity, $precision3 Incident, $precision3 Normal, $precision IORSource, $precision IORMedium)", GetFunctionName());
using (s.BlockScope())
{
s.AppendLine("$precision internalIORSource = max(IORSource, 1.0);");
s.AppendLine("$precision internalIORMedium = max(IORMedium, 1.0);");
s.AppendLine("$precision eta = internalIORSource/internalIORMedium;");
s.AppendLine("$precision cos0 = dot(Incident, Normal);");
s.AppendLine("$precision k = 1.0 - eta*eta*(1.0 - cos0*cos0);");
if (m_RefractMode == RefractMode.Safe)
{
s.AppendLine("Refracted = eta*Incident - (eta*cos0 + sqrt(max(k, 0.0)))*Normal;");
}
else
{
s.AppendLine("Refracted = k >= 0.0 ? eta*Incident - (eta*cos0 + sqrt(k))*Normal : reflect(Incident, Normal);");
}
s.AppendLine("Intensity = internalIORSource <= internalIORMedium ?");
s.AppendLine(" saturate(F_Transm_Schlick(IorToFresnel0(internalIORMedium, internalIORSource), -cos0)) :");
s.AppendLine(" (k >= 0.0 ? F_FresnelDielectric(internalIORMedium/internalIORSource, -cos0) : ");
if (m_RefractMode == RefractMode.Safe)
{
s.Append("0.0);");
}
else
{
s.Append("1.0);");
}
}
});
}