uniform sampler2D u_tex;
uniform vec2 u_invRes;

varying vec2 v_uv;

float offset[3];
float weight[3];

void main() {
    offset[0] = 0.0; offset[1] = 1.3846153846; offset[2] = 3.2307692308;
    weight[0] = 0.2270270270; weight[1] = 0.3162162162; weight[2] = 0.0702702703;

    vec3 tc = texture2D(u_tex, v_uv).rgb * weight[0] * 2.0;
    for (int i = 1; i < 3; i++) {
        tc += weight[i] * texture2D(u_tex, v_uv + vec2(0.0, u_invRes.y * offset[i])).rgb;
        tc += weight[i] * texture2D(u_tex, v_uv - vec2(0.0, u_invRes.y * offset[i])).rgb;
    }

    gl_FragColor = vec4(tc, 1.0);
}