struct PS_INPUT
{
    float4 posScr: POSITION;
    float2 texCoord: TEXCOORD0;
    float nFace: TEXCOORD1;
};


struct PS_OUTPUT
{
    float4  color: COLOR0;
};

///////////////////////////////////////////////////////////////////////////////

sampler tex0: register(s0);

///////////////////////////////////////////////////////////////////////////////
// Pixelshader
// Profile: 2x0
const int CUBEMAP_SIZE = 128;
const int REDUCED_CUBEMAP_SIZE = 4;

PS_OUTPUT main(PS_INPUT input)
{
//const int RATE = CUBEMAP_SIZE / REDUCED_CUBEMAP_SIZE;
const int RATE = 32;

PS_OUTPUT output;
float3 dir;
 
float4 color = float4(0,0,0,0);

   for (int i = 0; i < RATE; i++)
     for (int j = 0; j < RATE; j++)
   {
float2 pos;
pos.x = input.texCoord.x + (2*i + 1)/(float)CUBEMAP_SIZE;
pos.y = input.texCoord.y - (2*j + 1)/(float)CUBEMAP_SIZE;// y=-u

 // "scrambling"
if (input.nFace == 0) dir = float3(1, pos.y, -pos.x);
if (input.nFace == 1) dir = float3(-1, pos.y, pos.x);
if (input.nFace == 2) dir = float3(pos.x, 1, -pos.y);
if (input.nFace == 3) dir = float3(pos.x, -1, pos.y);
if (input.nFace == 4) dir = float3(pos.x, pos.y, 1);
if (input.nFace == 5) dir = float3(-pos.x, pos.y,-1);

color += texCUBElod( tex0, float4(dir,0));
    }

 output.color = color / (RATE * RATE);
 return output;
}

///////////////////////////////////////////////////////////////////////////////