// Copyright 1998-2017 Epic Games, Inc. All Rights Reserved.

/*=============================================================================
	SimpleElementNormalMapPixelShader.hlsl: Pixel shader for previewing normal
		map textures rendered as simple elements.
=============================================================================*/

#include "Common.usf"

#define WRITE_TO_GBUFFER (FEATURE_LEVEL >= FEATURE_LEVEL_SM4 && !FORWARD_SHADING)

Texture2D NormalMapTexture;
SamplerState NormalMapTextureSampler;

void Main(
	in float2 TextureCoordinate : TEXCOORD0,
	out float4 OutColor : SV_Target0
#if WRITE_TO_GBUFFER
	,out float4 OutWorldNormal : SV_Target1 
#endif
	)
{
	const float4 NormalSample = Texture2DSample(NormalMapTexture, NormalMapTextureSampler, TextureCoordinate);
	const float4 Normal = UnpackNormalMap(NormalSample);
	const float4 RescaledNormal = float4(Normal.xyz * 0.5 + 0.5, 1);
	OutColor = RETURN_COLOR(RescaledNormal);	

#if WRITE_TO_GBUFFER
	// Set the G buffer bits that indicate that deferred lighting and image reflections are not enabled
	OutWorldNormal = 0;
#endif
}