#version 450

layout(location = 0) in vec2 inTextCoord;
layout(location = 0) out float outAO;

layout(set = 0, binding = 0) uniform sampler2D ssaoSampler;

void main() {

    vec2 texelSize = 1.0 / vec2(textureSize(ssaoSampler, 0));
    float result = 0.0;

    for (int x = -2; x <= 2; x++) {
        for (int y = -2; y <= 2; y++) {
            vec2 offset = vec2(float(x), float(y)) * texelSize;
            result += texture(ssaoSampler, vec2(inTextCoord.x,inTextCoord.y) + offset).r;
        }
    }

    outAO = result / 25.0;
}