advanced_lighting/9.ssao/blur.frag


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#version 330 core

in vert_t {
	vec2 tex_coords;
} vert;

out float frag_color;

uniform sampler2D ssao;

void main()
{
	vec2 texel_size = 1.0 / vec2(textureSize(ssao, 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)) * texel_size;
			result += texture(ssao, vert.tex_coords + offset).r;
		}
	}
	frag_color = result / (4.0 * 4.0);
}