//======= Copyright © 1996-2006, Valve Corporation, All rights reserved. ======

// DYNAMIC: "PIXELFOGTYPE"		"0..1"

#include "common_cbuffers_fxc.h"

CBUFFER_PERSCENE( register( b0 ) )
CBUFFER_PERFRAME( register( b1 ) )

#include "common_ps_fxc.h"

#include "vertexlitgeneric_dx11_shared.h"

cbuffer DecalModulate_CBuffer : register( b2 )
{
	VertexLitAndUnlitGeneric_t c;
};

Texture2D Tex : register( t0 );
sampler TexSampler	: register( s0 );

#define g_EyePos cEyePos

struct PS_INPUT
{
	float4 projPos					: SV_POSITION;

	HALF2 baseTexCoord				: TEXCOORD0;		// Base texture coordinate
	
    HALF2 detailTexCoord			: TEXCOORD1;
    float4 color					: TEXCOORD2;
    float3 worldVertToEyeVector		: TEXCOORD3;
    float3 worldSpaceNormal         : TEXCOORD4;
	float4 worldPos_projPosZ		: TEXCOORD5;		// Necessary for pixel fog

	float3 eyeSpacePos				: COLOR0;
};

float4 main( PS_INPUT i ) : SV_TARGET
{
	float4 result = Tex.Sample( TexSampler, i.baseTexCoord );
	
	float fogFactor = CalcPixelFogFactor( PIXELFOGTYPE, c.g_FogParams, g_EyePos.z, i.worldPos_projPosZ.z, length( i.eyeSpacePos ) );
	
	// Since we're blending with a mod2x, we need to compensate with this hack
	// NOTE: If the fog color (not fog density) is extremely dark, this can makes some decals seem
	//       a little transparent, but it's better than not doing this
	fogFactor = pow( saturate( fogFactor ), 0.4f );

	return FinalOutput( result, fogFactor, PIXELFOGTYPE, c.g_FogColor, TONEMAP_SCALE_NONE );
}