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Shader test bench
Pixelate
runnable fragment
Complete GLSL fragment shader. Stronghold runs it directly when the browser can compile it.
Code
precision mediump float;
varying vec2 v_texCoord;
uniform sampler2D u_texture;
uniform vec2 u_resolution;
uniform float u_block; // pixel block size (2-64)
void main() {
vec2 uv = v_texCoord;
uv = floor(uv * u_resolution / u_block) * u_block / u_resolution + u_block / u_resolution * 0.5;
gl_FragColor = texture2D(u_texture, uv);
}