// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once

#include "/Engine/Private/SceneData.ush"
#include "/Engine/Private/MaterialCache/MaterialCacheABuffer.ush"

bool GetMaterialCacheState()
{
#if MATERIAL_CACHE
	return true;
#else // MATERIAL_CACHE
	return false;
#endif // MATERIAL_CACHE
}

uint2 GetMaterialCacheTextureDescriptor(FPrimitiveSceneData PrimitiveData)
{
	return PrimitiveData.MaterialCacheTextureDescriptor;
}

uint GetMaterialCacheTextureCoordinateIndex(FPrimitiveSceneData PrimitiveData)
{
	return GetMaterialCacheTextureDescriptor(PrimitiveData).y >> 30;
}

bool GetMaterialCacheTextureDescriptorIsValid(FPrimitiveSceneData PrimitiveData)
{
	return GetMaterialCacheTextureDescriptor(PrimitiveData).x != 0;
}

/** 
 * Material virtual getters
 * VT schema currently just stores the ABuffer, will probably change
 */

float3 GetMaterialCacheBaseColor(float4 Layer)
{
	return Layer.xyz;
}

float3 GetMaterialCacheRoughness(float4 Layer)
{
	return Layer.w;
}

float3 GetMaterialCacheWorldNormal(float4 Layer)
{
	return OctahedronToUnitVector(Layer.xy * 2.0f - 1.0f);
}

float3 GetMaterialCacheSpecular(float4 Layer)
{
	return Layer.z;
}

float3 GetMaterialCacheOpacity(float4 Layer)
{
	return Layer.w;
}

float3 GetMaterialCacheMetallic(float4 Layer)
{
	return Layer.x;
}

float3 GetMaterialCacheWorldPositionOffset(float4 Layer)
{
	return UnpackMaterialCacheWorldPositionOffset(Layer.zyw);
}