//-----------------------------------------------------------------------------
// Copyright (c) 2012 GarageGames, LLC
//
// 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
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//-----------------------------------------------------------------------------

#include "../postFx.hlsl"  
#include "../../torque.hlsl"

TORQUE_UNIFORM_SAMPLER2D(backBuffer, 0);

uniform float2 LensXOffsets;

float4 main( PFXVertToPix IN ) : TORQUE_TARGET0
{
   float2 texCoord;
   float xOffset;
   float2 lensCenter;
   lensCenter.y = 0.5;
   if(IN.uv0.x < 0.5)
   {
      texCoord.x = IN.uv0.x;
      texCoord.y = IN.uv0.y;
      xOffset = 0.0;
      lensCenter.x = LensXOffsets.x;
   }
   else
   {
      texCoord.x = IN.uv0.x - 0.5;
      texCoord.y = IN.uv0.y;
      xOffset = 0.5;
      lensCenter.x = LensXOffsets.y;
   }

   texCoord.x *= 2.0;
   texCoord.x += lensCenter.x;
   texCoord.x *= 0.5;
   texCoord.x += 0.25;
   
   float4 color = TORQUE_TEX2D(backBuffer, texCoord);

   return color;    
}
