[gnome-games] retro-gamepad: Support rumble

[Adrien Plazas <aplazas src gnome org>]

commit 96efe9d47aecad6e8760e6a326da4bf523860db3
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Sun Nov 19 15:50:24 2017 +0100

    retro-gamepad: Support rumble
    
    Forward the rumble requests from the Libretro core to the gamepad.

 src/retro/retro-gamepad.vala |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)
---
diff --git a/src/retro/retro-gamepad.vala b/src/retro/retro-gamepad.vala
index 8791707..90fa2b6 100644
--- a/src/retro/retro-gamepad.vala
+++ b/src/retro/retro-gamepad.vala
@@ -6,6 +6,7 @@ private class Games.RetroGamepad: Object, Retro.Controller {
 
        private bool[] buttons;
        private int16[] axes;
+       private uint16 rumble_effect[2];
 
        public RetroGamepad (Manette.Device device, bool present_analog_sticks) {
                Object (device: device, present_analog_sticks: present_analog_sticks);
@@ -54,7 +55,16 @@ private class Games.RetroGamepad: Object, Retro.Controller {
        }
 
        public bool set_rumble_state (Retro.RumbleEffect effect, uint16 strength) {
-               return false;
+               rumble_effect[effect] = strength;
+
+               if (!device.has_rumble ())
+                       return false;
+
+               device.rumble (rumble_effect[Retro.RumbleEffect.STRONG],
+                              rumble_effect[Retro.RumbleEffect.WEAK],
+                              uint16.MAX);
+
+               return true;
        }
 
        private bool get_button_pressed (Retro.JoypadId button) {