cube-game-plus-plus/resources/shader/antialiasFragment.fs

#version 430

layout (binding = 0) uniform sampler2D colorSamp;

in vec2 varTex;
out vec4 color;

uniform int radius;

void main() {
    vec2 texelSize = 1.0 / vec2(textureSize(colorSamp, 0));
    color = vec4(0.0, 0.0, 0.0, 0.0);
    for(float x = 0; x < radius; x++) {
        for(float y = 0; y < radius; y++) {
            vec2 offset = vec2(x, y) * texelSize;
            color += texture(colorSamp, varTex + offset);
        }
    }
    color /= (radius * radius);
}