From 2debe0d158a0192c7d665ad316d4bcf105e96537 Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson2@worcester.edu>
Date: Fri, 20 Jan 2017 20:14:11 -0500
Subject: Add game controller example.

---
 Makefile.am             |  3 ++-
 examples/controller.scm | 56 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+), 1 deletion(-)
 create mode 100644 examples/controller.scm

diff --git a/Makefile.am b/Makefile.am
index 4dbaf71..5e033aa 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -88,7 +88,8 @@ EXTRA_DIST +=					\
   README					\
   guix.scm					\
   examples/hello.scm				\
-  examples/hello.bmp
+  examples/hello.bmp				\
+  examples/controller.scm
 
 publish: dist
 	gpg2 --sign --armor --yes guile-sdl2-$(VERSION).tar.gz && \
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))))))
-- 
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