gamepad_joystick.mwel

///////////////////////////////////////////////////////////////////////////////
//
// PS3 Gamepad interface
//
// Usage: Use the left-side rocker to control left/right/up/down motion.
//
///////////////////////////////////////////////////////////////////////////////


%define update_joystick ()
    
    x_force = (
        (rocker_x > 128 + 8) * (rocker_x - 128) / 128 +
        (rocker_x < 128 - 8) * (rocker_x - 128) / 128
    )
    y_force = (
        (rocker_y < 128 - 8) * (128 - rocker_y) / 128 +
        (rocker_y > 128 + 8) * (128 - rocker_y) / 128
    )

    /*
    // The gamepad rocker's resting position is a little noisy. Even when not
    // touched, it's values are not exactly 128. That is why we ignore small
    // actions above. In the version below we do not ignore small actions, but
    // this means that the agent never stops moving, even when you let go of the
    // rocker.
    
    x_force = rocker_x / 128 - 1
    y_force = 1 - rocker_y / 128
    */
%end

group 'Joystick variables' {
    var x_force = 0
    var y_force = 0

    var rocker_x = 128 {
        update_joystick ()
    }
    var rocker_y = 128 {
        update_joystick ()
    }
}

%define joystick_device ()
    iodevice/usbhid_generic (
        usage_page = 1
        usage = 5
        // preferred_location_id = 338755584  // sony PS3 gamepad macbook laptop
        // log_all_input_values = true
        )
%end

%define joystick_name_to_usage = {
    'rocker_X_channel': 48,
    'rocker_Y_channel': 49,
}

joystick_device controller {
    iochannel/usbhid_generic_input_channel (
        usage_page = 1
        usage = joystick_name_to_usage['rocker_X_channel']
        value = rocker_x
        )
    iochannel/usbhid_generic_input_channel (
        usage_page = 1
        usage = joystick_name_to_usage['rocker_Y_channel']
        value = rocker_y
        )
}