// Copyright FlecsProj. All Rights Reserved.
// Shared struct definitions for ShaderLab-generated Custom HLSL nodes.
// Included by every generated UMaterialExpressionCustom node via IncludeFilePaths.

#pragma once

// Per-pixel/vertex inputs are read through `UE::NodeName(...)` intrinsics (resolved by the graph
// builder to real material expression nodes), not through a context struct.

// Surface description filled by the Surface(...) body. Defaults mirror the
// UMaterialExpressionSubstrateSlabBSDF pin defaults so that fields the body does not
// touch keep Substrate's native behavior.
struct FShaderLabSurface
{
	float3 DiffuseAlbedo;
	float3 F0;
	float3 F90;
	float  Roughness;
	float  Anisotropy;
	float3 Normal;
	float3 Tangent;
	float3 SSSMFP;
	float  SSSMFPScale;
	float  SSSPhaseAnisotropy;
	float3 EmissiveColor;
	float  SecondRoughness;
	float  SecondRoughnessWeight;
	float  FuzzRoughness;
	float  FuzzAmount;
	float3 FuzzColor;
	float  GlintValue;
	float2 GlintUV;
	float  Opacity;
	float  OpacityMask;
};

// Output for the PostProcess(...) entry (Domain = PostProcess). Color feeds the material EmissiveColor.
struct FShaderLabPostProcess
{
	float3 Color;
	float  Opacity;
};

// Output for the UI(...) entry (Domain = UI). Color feeds EmissiveColor, Opacity the material Opacity.
struct FShaderLabUI
{
	float3 Color;
	float  Opacity;
};

// Vertex-stage outputs filled by the optional Vertex(...) body.
struct FShaderLabVertex
{
	float3 WorldPositionOffset;
	float  Displacement;
	float2 CustomizedUV0;
	float2 CustomizedUV1;
	float2 CustomizedUV2;
	float2 CustomizedUV3;
};

FShaderLabSurface ShaderLabDefaultSurface()
{
	FShaderLabSurface S;
	S.DiffuseAlbedo = float3(0.18, 0.18, 0.18);
	S.F0 = float3(0.04, 0.04, 0.04);
	S.F90 = float3(1, 1, 1);
	S.Roughness = 0.5;
	S.Anisotropy = 0;
	S.Normal = float3(0, 0, 1);
	S.Tangent = float3(1, 0, 0);
	S.SSSMFP = float3(0, 0, 0);
	S.SSSMFPScale = 1;
	S.SSSPhaseAnisotropy = 1;
	S.EmissiveColor = float3(0, 0, 0);
	S.SecondRoughness = 0.5;
	S.SecondRoughnessWeight = 0;
	S.FuzzRoughness = 0.5;
	S.FuzzAmount = 0;
	S.FuzzColor = float3(0, 0, 0);
	S.GlintValue = 1;
	S.GlintUV = float2(0, 0);
	S.Opacity = 1;
	S.OpacityMask = 1;
	return S;
}

FShaderLabPostProcess ShaderLabDefaultPostProcess()
{
	FShaderLabPostProcess P;
	P.Color = float3(0, 0, 0);
	P.Opacity = 1;
	return P;
}

FShaderLabUI ShaderLabDefaultUI()
{
	FShaderLabUI U;
	U.Color = float3(0, 0, 0);
	U.Opacity = 1;
	return U;
}

FShaderLabVertex ShaderLabDefaultVertex()
{
	FShaderLabVertex V;
	V.WorldPositionOffset = float3(0, 0, 0);
	V.Displacement = 0;
	V.CustomizedUV0 = float2(0, 0);
	V.CustomizedUV1 = float2(0, 0);
	V.CustomizedUV2 = float2(0, 0);
	V.CustomizedUV3 = float2(0, 0);
	return V;
}