add simple test showing off hotplugging of joysticks w/ haptic.

test/Makefile.in

@@ -24,6 +24,7 @@ TARGETS = \
 	testgles2$(EXE) \
 	testhaptic$(EXE) \
 	testrumble$(EXE) \
+	testhotplug$(EXE) \
 	testthread$(EXE) \
 	testiconv$(EXE) \
 	testime$(EXE) \
@@ -139,6 +140,9 @@ testgles2$(EXE): $(srcdir)/testgles2.c
 testhaptic$(EXE): $(srcdir)/testhaptic.c
 	$(CC) -o $@ $^ $(CFLAGS) $(LIBS)
 
+testhotplug$(EXE): $(srcdir)/testhotplug.c
+	$(CC) -o $@ $^ $(CFLAGS) $(LIBS)
+
 testrumble$(EXE): $(srcdir)/testrumble.c
 	$(CC) -o $@ $^ $(CFLAGS) $(LIBS)
 

test/testhotplug.c

@@ -0,0 +1,130 @@
+/*
+  Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely.
+*/
+
+/* Simple program to test the SDL joystick hotplugging */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "SDL.h"
+#include "SDL_haptic.h"
+
+#ifndef SDL_JOYSTICK_DISABLED
+
+int
+main(int argc, char *argv[])
+{
+    SDL_Joystick *joystick = NULL;
+    SDL_Haptic *haptic = NULL;
+    SDL_JoystickID instance = -1;
+    SDL_bool keepGoing = SDL_TRUE;
+
+    /* Enable standard application logging */
+    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);	
+
+    SDL_SetHint(SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS, "1");
+
+    /* Initialize SDL (Note: video is required to start event loop) */
+    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK | SDL_INIT_HAPTIC) < 0) {
+        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
+        exit(1);
+    }
+
+    //SDL_CreateWindow("Dummy", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 128, 128, 0);
+
+    SDL_Log("There are %d joysticks at startup\n", SDL_NumJoysticks());
+    SDL_Log("There are %d haptic devices at startup\n", SDL_NumHaptics());
+
+    while(keepGoing)
+    {
+        SDL_Event event;
+        while(SDL_PollEvent(&event))
+        {
+            switch(event.type)
+            {
+                case SDL_QUIT:
+                    keepGoing = SDL_FALSE;
+                    break;
+                case SDL_JOYDEVICEADDED:
+                    if (joystick != NULL)
+                    {
+                        SDL_Log("Only one joystick supported by this test\n");
+                    }
+                    else
+                    {
+                        joystick = SDL_JoystickOpen(event.jdevice.which);
+                        instance = SDL_JoystickInstanceID(joystick);
+                        SDL_Log("Joy Added  : %d : %s\n", event.jdevice.which, SDL_JoystickName(joystick));
+                        if (SDL_JoystickIsHaptic(joystick))
+                        {
+                            haptic = SDL_HapticOpenFromJoystick(joystick);
+                            if (haptic)
+                            {
+                                SDL_Log("Joy Haptic Opened\n");
+                                if (SDL_HapticRumbleInit( haptic ) != 0)
+                                {
+                                    SDL_Log("Could not init Rumble!");
+                                    SDL_HapticClose(haptic);
+                                    haptic = NULL;
+                                }
+                            } else {
+                                SDL_Log("Joy haptic FAILED!\n");
+                            }
+                        }
+                    }
+                    break;
+                case SDL_JOYDEVICEREMOVED:
+                    if (instance == event.jdevice.which)
+                    {
+                        SDL_Log("Joy Removed: %d\n", event.jdevice.which);
+                        instance = -1;
+                        if(haptic)
+                        {
+                            SDL_HapticClose(haptic);
+                        }
+                        SDL_JoystickClose(joystick);
+                        joystick = NULL;
+                    } else {
+                        SDL_Log("Unknown joystick diconnected\n");
+                    }
+                    break;
+                case SDL_JOYAXISMOTION:
+//                    SDL_Log("Axis Move: %d\n", event.jaxis.axis);
+                    SDL_HapticRumblePlay(haptic, 0.2, 250);
+                    break;
+                case SDL_JOYBUTTONDOWN:
+                    SDL_Log("Button Press: %d\n", event.jbutton.button);
+                    if(haptic)
+                    {
+                        SDL_HapticRumblePlay(haptic, 0.2, 250);
+                    }
+                    break;
+                case SDL_JOYBUTTONUP:
+                    SDL_Log("Button Release: %d\n", event.jbutton.button);
+                    break;
+            }
+        }
+    }
+
+    SDL_QuitSubSystem(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK);
+}
+#else
+
+int
+main(int argc, char *argv[])
+{
+    SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL compiled without Joystick support.\n");
+    exit(1);
+}
+
+#endif