//-----------------------------------------------------------------------------
// Copyright (c) 2014 R.G.S. - Richards Game Studio, the Netherlands
//					  http://www.richardsgamestudio.com/
//
// If you find this code useful or you are feeling particularly generous I
// would ask that you please go to http://www.richardsgamestudio.com/ then
// choose Donations from the menu on the left side and make a donation to
// Richards Game Studio. It will be highly appreciated.
//
// The MIT License:
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// IN THE SOFTWARE.
//-----------------------------------------------------------------------------

// Volumetric Fog Glow postFx pixel shader V1.00

#include "./postFx.hlsl"

TORQUE_UNIFORM_SAMPLER2D(diffuseMap, 0);
uniform float strength;

struct VertToPix
{
   float4 hpos       : TORQUE_POSITION;

   float2 uv0        : TEXCOORD0;
   float2 uv1        : TEXCOORD1;
   float2 uv2        : TEXCOORD2;
   float2 uv3        : TEXCOORD3;

   float2 uv4        : TEXCOORD4;
   float2 uv5        : TEXCOORD5;
   float2 uv6        : TEXCOORD6;
   float2 uv7        : TEXCOORD7;
};

float4 main( VertToPix IN ) : TORQUE_TARGET0
{
   float4 kernel = float4( 0.175, 0.275, 0.375, 0.475 ) * strength;

   float4 OUT = 0;
   OUT += TORQUE_TEX2D( diffuseMap, IN.uv0 ) * kernel.x;
   OUT += TORQUE_TEX2D( diffuseMap, IN.uv1 ) * kernel.y;
   OUT += TORQUE_TEX2D( diffuseMap, IN.uv2 ) * kernel.z;
   OUT += TORQUE_TEX2D( diffuseMap, IN.uv3 ) * kernel.w;

   OUT += TORQUE_TEX2D( diffuseMap, IN.uv4 ) * kernel.x;
   OUT += TORQUE_TEX2D( diffuseMap, IN.uv5 ) * kernel.y;
   OUT += TORQUE_TEX2D( diffuseMap, IN.uv6 ) * kernel.z;
   OUT += TORQUE_TEX2D( diffuseMap, IN.uv7 ) * kernel.w;

   // Calculate a lumenance value in the alpha so we
   // can use alpha test to save fillrate.
   float3 rgb2lum = float3( 0.30, 0.59, 0.11 );
   OUT.a = dot( OUT.rgb, rgb2lum );

   return OUT;
}