if (!surface_exists(surface))
    surface = surface_create(320, 240);
if (image_alpha == 0)
    exit;
surface_set_target(surface);
draw_clear_alpha(c_black, 1);
draw_sprite(spr_dazzle_bg, 0, 0, 0);
gpu_set_blendmode_ext_sepalpha(bm_src_alpha, bm_inv_src_alpha, bm_one, bm_one);
for (var i = 0; i < particle_count; i++)
{
    with (particles[i])
        event_user(0);
}
surface_reset_target();
gpu_set_blendmode(bm_normal);
draw_set_blend_mode(bm_normal);
draw_surface_ext(surface, camerax(), cameray(), 2, 2, 0, image_blend, image_alpha);