// CREATE

view_screen_width = 320
view_screen_height = 240

window_pixel_scale = 2 // Размер пикселей

port_screen_width = view_screen_width * window_pixel_scale
port_screen_height = view_screen_height * window_pixel_scale

window_set_size( port_screen_width, port_screen_height )

application_surface_draw_enable(false);

was_fullscreen = window_get_fullscreen()

MonitorW = display_get_width();
MonitorH = display_get_height();

scale = min(MonitorW div view_screen_width, MonitorH div view_screen_height)

Xoffset = (MonitorW - view_screen_width  * scale) / 2
Yoffset = (MonitorH - view_screen_height * scale) / 2

// STEP

if (window_get_fullscreen()) {
    if was_fullscreen
        exit
    if window_get_width() != port_screen_width || window_get_height() != port_screen_height
        window_set_size( port_screen_width, port_screen_height );
    was_fullscreen = true

}
else {
    was_fullscreen = false
    if window_get_width() != port_screen_width || window_get_height() != port_screen_height
        window_set_size( port_screen_width, port_screen_height );

}

// PRE-DRAW

if (window_get_fullscreen())
{
    draw_surface_ext(application_surface,Xoffset,Yoffset,scale,scale,0,c_white,1)
}
else
{
    draw_surface_ext(application_surface,0,0,window_pixel_scale,window_pixel_scale,0,c_white,1)
}