// Copyright UShaderLab. All Rights Reserved.
//
// Internal shared helpers + per-category registration entry points for the builtin `UE_` intrinsics.
// Registration is split by category (mesh/view/object/instancing/time/particle/decal/atmosphere) into
// separate .cpp files for maintainability; each defines one RegisterXxxIntrinsics(registry) that the
// registry's RegisterBuiltins() calls.

#pragma once

#include "CoreMinimal.h"
#include "Materials/Material.h"
#include "ShaderLabIntrinsicRegistry.h"

namespace ShaderLabIntrinsic_Private
{
	/** NewObject a no-config expression node and add it to the material's collection. */
	template <typename T>
	UMaterialExpression* MakeSimple(UMaterial& Material)
	{
		T* Expr = NewObject<T>(&Material);
		Material.GetExpressionCollection().AddExpression(Expr);
		return Expr;
	}

	/**
	 * Register a no-arg intrinsic that maps to a source node. `OutputIndex` selects which output pin to
	 * connect (non-zero for one facet of a multi-output node, e.g. a directional light's Direction).
	 */
	void AddSimple(
		FShaderLabIntrinsicRegistry& Registry,
		const TCHAR* Name,
		EShaderLabIntrinsicFrequency Frequency,
		const TCHAR* ReturnType,
		TFunction<UMaterialExpression*(UMaterial&)> Make,
		int32 OutputIndex = 0);
}

// Per-category registration (defined in ShaderLabIntrinsics_<Category>.cpp).
void RegisterMeshIntrinsics(FShaderLabIntrinsicRegistry& Registry);
void RegisterViewIntrinsics(FShaderLabIntrinsicRegistry& Registry);
void RegisterObjectIntrinsics(FShaderLabIntrinsicRegistry& Registry);
void RegisterInstancingIntrinsics(FShaderLabIntrinsicRegistry& Registry);
void RegisterTimeIntrinsics(FShaderLabIntrinsicRegistry& Registry);
void RegisterParticleIntrinsics(FShaderLabIntrinsicRegistry& Registry);
void RegisterDecalIntrinsics(FShaderLabIntrinsicRegistry& Registry);
void RegisterAtmosphereIntrinsics(FShaderLabIntrinsicRegistry& Registry);
void RegisterDistanceFieldIntrinsics(FShaderLabIntrinsicRegistry& Registry);