// Copyright UShaderLab. All Rights Reserved.
//
// Decal intrinsics (meaningful in the Decal domain; the instance/domain gates usage).

#include "ShaderLabIntrinsics.h"

#include "Materials/MaterialExpressionDecalColor.h"
#include "Materials/MaterialExpressionDecalDerivative.h"
#include "Materials/MaterialExpressionDecalLifetimeOpacity.h"

void RegisterDecalIntrinsics(FShaderLabIntrinsicRegistry& Registry)
{
	using namespace ShaderLabIntrinsic_Private;
	using EFreq = EShaderLabIntrinsicFrequency;

	// DecalColor's default output pin is RGB (float3).
	AddSimple(Registry, TEXT("DecalColor"), EFreq::PixelOnly, TEXT("float3"), [](UMaterial& M) { return MakeSimple<UMaterialExpressionDecalColor>(M); });
	AddSimple(Registry, TEXT("DecalLifetimeOpacity"), EFreq::PixelOnly, TEXT("float"), [](UMaterial& M) { return MakeSimple<UMaterialExpressionDecalLifetimeOpacity>(M); });

	// DecalDerivative is multi-output (DDX, DDY) — one intrinsic per output pin.
	AddSimple(Registry, TEXT("DecalDerivativeDDX"), EFreq::PixelOnly, TEXT("float2"), [](UMaterial& M) { return MakeSimple<UMaterialExpressionDecalDerivative>(M); }, 0);
	AddSimple(Registry, TEXT("DecalDerivativeDDY"), EFreq::PixelOnly, TEXT("float2"), [](UMaterial& M) { return MakeSimple<UMaterialExpressionDecalDerivative>(M); }, 1);
}