//-----------------------------------------------------------------------------
// 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"

uniform sampler2D inputTex : register( S0 );
uniform float2 oneOverTargetSize;


static float2 gTapOffsets[16] = 
{
   { -1.5, -1.5 }, { -0.5, -1.5 }, { 0.5, -1.5 }, { 1.5, -1.5 },
   { -1.5, -0.5 }, { -0.5, -0.5 }, { 0.5, -0.5 }, { 1.5, -0.5 },
   { -1.5, 0.5 },  { -0.5, 0.5 },  { 0.5, 0.5 },  { 1.5, 0.5 },
   { -1.5, 1.5 },  { -0.5, 1.5 },  { 0.5, 1.5 },  { 1.5, 1.5 }
};

float4 main( PFXVertToPix IN ) : COLOR
{
   float2 pixelSize = oneOverTargetSize;

   float average = 0.0;

   for ( int i = 0; i < 16; i++ )
   {
      float lum = tex2D( inputTex, IN.uv0 + ( gTapOffsets[i] * pixelSize ) ).r;
      average += lum;
   }

   return float4( average / 16.0, 0.0, 0.0, 1.0 );
}
