Add game controller example.

1 files changed, 56 insertions, 0 deletions

diff --git a/examples/controller.scm b/examples/controller.scm
new file mode 100644
index 0000000..7989e7c
--- /dev/null
+++ b/examples/controller.scm
@@ -0,0 +1,56 @@
+(use-modules (sdl2)
+             (sdl2 events)
+             (sdl2 video)
+             (sdl2 input game-controller)
+             (sdl2 input joystick))
+
+(sdl-init)
+
+(if (not (game-controller-index? 0))
+    (begin
+      (display "sorry, there are no controllers available!\n")
+      (exit 1))
+    (display "connecting to controller 0\n"))
+
+(define controller (open-game-controller 0))
+(define window (make-window #:opengl? #t))
+(define running? #t)
+(define last-power-check 0)
+
+(while running?
+  (let ((time (sdl-ticks)))
+    (when (and (zero? (modulo time 2000))
+               (not (= time last-power-check)))
+      (set! last-power-check time)
+      (display "controller power level: ")
+      (display (joystick-power-level (game-controller-joystick controller)))
+      (newline)))
+  (let ((event (poll-event)))
+    (when event
+      (cond
+       ((quit-event? event)
+        (display "bye!\n")
+        (set! running? #f))
+       ((controller-device-event? event)
+        (display "controller ")
+        (display (controller-device-event-which event))
+        (display " ")
+        (display (controller-device-event-action event))
+        (newline))
+       ((controller-button-event? event)
+        (display (if (controller-button-event-pressed? event)
+                     "pressed"
+                     "released"))
+        (display " button ")
+        (display (controller-button-event-button event))
+        (display " on controller ")
+        (display (controller-button-event-which event))
+        (newline))
+       ((controller-axis-event? event)
+        (display "moved ")
+        (display (controller-axis-event-axis event))
+        (display " to ")
+        (display (controller-axis-event-value event))
+        (display " on controller ")
+        (display (controller-axis-event-which event))
+        (newline))))))