spg-project/resources/blur.fs

#version 430

layout (binding = 0) uniform sampler2D depthSamp;

in vec2 varTex;

out vec2 color;

void main(void) {
    vec2 sum = vec2(0.0, 0.0);

    vec2 texelSize = 1.0 / vec2(textureSize(depthSamp, 0));
    const int radius = 4;
    for(int x = -radius; x < radius; x++) {
        for(int y = -radius; y < radius; y++) {
            vec2 offset = vec2(x, y) * texelSize;
            float depth = texture(depthSamp, varTex + offset).r;
            sum += vec2(depth, depth * depth);
        }
    }
    sum /= (radius * radius * 4);

    color = sum;
}