rg3d 0.24.0

3D Game engine
Documentation 
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uniform sampler2D frameSampler;
uniform vec2 invSize;

in vec2 texCoord;

out float outLum;

void main() {
    float totalLum = 0.0;
    for (float y = -0.5; y < 0.5; y += 0.5) {
        for (float x = -0.5; x < 0.5; x += 0.5) {
            totalLum += S_Luminance(texture(frameSampler, texCoord - vec2(x, y) * invSize).xyz);
        }
    }
    outLum = totalLum / 9.0;
}