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GLSL

#version 120
uniform sampler2D DiffuseSampler;
varying vec2 texCoord;
varying vec2 oneTexel;
uniform vec2 InSize;
uniform float Resolution = 4.0;
uniform float Saturation = 1.5;
uniform float MosaicSize = 8.0;
void main() {
vec2 mosaicInSize = InSize / MosaicSize;
vec2 fractPix = fract(texCoord * mosaicInSize) / mosaicInSize;
vec4 baseTexel = texture2D(DiffuseSampler, texCoord - fractPix);
baseTexel = baseTexel - fract(baseTexel * Resolution) / Resolution;
float luma = dot(baseTexel.rgb, vec3(0.3, 0.59, 0.11));
vec3 chroma = (baseTexel.rgb - luma) * Saturation;
baseTexel = vec4(luma + chroma, baseTexel.a);
gl_FragColor = baseTexel;
}