if (!_enabled)
    exit;
shader_replace_simple_set_hook(shader);
var _sw = surface_get_width(application_surface);
var _sh = surface_get_height(application_surface);
shader_set_uniform_f(u_radius, blurradius);
shader_set_uniform_f(u_angle, spinspeed);
shader_set_uniform_f(u_time, time);
if (!surface_exists(blursurf))
    blursurf = surface_create(320, 240);
gpu_set_blendenable(false);
surface_set_target(blursurf);
draw_clear_alpha(c_black, 0);
draw_surface_ext(application_surface, 0, 0, 320 / _sw, 240 / _sh, 0, c_white, 1);
surface_reset_target();
shader_replace_simple_reset_hook();
gpu_set_blendenable(true);
var _multiplier = (global.darkzone == 0) ? 0.5 : 1;
draw_surface_ext(blursurf, camerax(), cameray(), (_multiplier * _sw) / 320, (_multiplier * _sh) / 240, 0, c_white, 1);