uniform int column[15] = {0,2,3,5,7,0,2,4,5,7,0,2,4,5,7};


	

const int phaseR = 0, phaseG = 1, phaseB = 2;

struct VS_QUAD
{
	float4 Position : POSITION;
	float2 UV		: TEXCOORD0;
};


int eye_pixelpattern(float2 scrcoord, int renderPhase)
{
	float i = floor(frac(scrcoord.x / 5) * 5);	
	int cureye;
	if(renderPhase == phaseR){
		float r = floor(frac((0 + i*5) / 8) * 8); // (0 + i*5) modulo 8
		r = floor(frac((r + scrcoord.y)/8)*8);
		cureye = (int)r;
	}
	if(renderPhase == phaseG){
		float g = floor(frac((2 + i*5) / 8) * 8); // (2 + i*5) modulo 8
		g = g-1;
		g = floor(frac((g + scrcoord.y)/8)*8);
		cureye = (int)g;
	}
	if(renderPhase == phaseB){
		float b = floor(frac((3 + i*5) / 8) * 8); // (3 + i*5) modulo 8
		b = floor(frac((b + scrcoord.y)/8)*8);
		cureye = (int)b;
	}
	return cureye;
}

float4 X3DPS(float2 UV : TEXCOORD0,
			uniform sampler2D tex3Sampler : register(s0),
			uniform float width, //window width
			uniform float height)//window height
			: COLOR0 
{	
	const int SAMPLE_ROWS = 4;
	const int SAMPLE_COLS = 2;
	
	float2 WPOS = float2(UV.x * width, UV.y * height);
	
	int cureyeRed = eye_pixelpattern(WPOS, phaseR);
	int cureyeGreen = eye_pixelpattern(WPOS, phaseG);
	int cureyeBlue = eye_pixelpattern(WPOS, phaseB);
	
	float4 col = 0;
	float2 M = float2(0.5, 0.25);
	
	float colR = floor(fmod(cureyeRed , SAMPLE_COLS));
    float rowR = floor(fmod(floor(cureyeRed / SAMPLE_COLS) , SAMPLE_ROWS));

    float colG = floor(fmod(cureyeGreen , SAMPLE_COLS));
    float rowG = floor(fmod(floor(cureyeGreen / SAMPLE_COLS) , SAMPLE_ROWS));

    float colB = floor(fmod(cureyeBlue , SAMPLE_COLS));
    float rowB = floor(fmod(floor(cureyeBlue / SAMPLE_COLS) , SAMPLE_ROWS));
	
	col.r = tex2D(tex3Sampler, M * (UV + float2(colR, rowR))).r;
    col.g = tex2D(tex3Sampler, M * (UV + float2(colG, rowG))).g;
    col.b = tex2D(tex3Sampler, M * (UV + float2(colB, rowB))).b;
	
    return col;     
}