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uniform sampler2DRect y_texture, u_texture, v_texture;
uniform float imageHeight;

void main(void) {
    float sx, sy, r, g, b, y, u, v;
    sx = gl_TexCoord[0].x;
    sy = imageHeight - gl_TexCoord[0].y;
    y = texture2DRect(y_texture, vec2(sx / 2.0, sy / 2.0)).r;
    u = texture2DRect(u_texture, vec2(sx / 2.0, sy / 2.0)).r;
    v = texture2DRect(v_texture, vec2(sx / 2.0, sy / 2.0)).r;
    y = 1.1643 * (y - 0.0625);
    u = u - 0.5;
    v = v - 0.5;
    r = y + 1.5958 * v;
    g = y - 0.39173 * u - 0.8129 * v;
    b = y + 2.017 * u;
    gl_FragColor = vec4(r, g, b, 1.0);
}