Pixelation Pixel Shader

Pixelation is process when pixel at x,y is duplicated into x+dx,y+dy rectangle. Pixelation GLSL fragment code:

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uniform sampler2D tex;

void main()
{
 float dx = 15.*(1./512.);
 float dy = 10.*(1./512.);
 vec2 coord = vec2(dx*floor(gl_TexCoord[0].x/dx),
                   dy*floor(gl_TexCoord[0].y/dy));
 gl_FragColor = texture2D(tex, coord);
}

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Smart

and pixelated version of it