SDL  2.0
testhotplug.c
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1 /*
2  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
3 
4  This software is provided 'as-is', without any express or implied
5  warranty. In no event will the authors be held liable for any damages
6  arising from the use of this software.
7 
8  Permission is granted to anyone to use this software for any purpose,
9  including commercial applications, and to alter it and redistribute it
10  freely.
11 */
12 
13 /* Simple program to test the SDL joystick hotplugging */
14 
15 #include <stdio.h>
16 #include <stdlib.h>
17 #include <string.h>
18 
19 #include "SDL.h"
20 
21 #if !defined SDL_JOYSTICK_DISABLED && !defined SDL_HAPTIC_DISABLED
22 
23 int
24 main(int argc, char *argv[])
25 {
26  SDL_Joystick *joystick = NULL;
27  SDL_Haptic *haptic = NULL;
28  SDL_JoystickID instance = -1;
29  SDL_bool keepGoing = SDL_TRUE;
30  int i;
31  SDL_bool enable_haptic = SDL_TRUE;
32  Uint32 init_subsystems = SDL_INIT_VIDEO | SDL_INIT_JOYSTICK;
33 
34  for (i = 1; i < argc; ++i) {
35  if (SDL_strcasecmp(argv[i], "--nohaptic") == 0) {
36  enable_haptic = SDL_FALSE;
37  }
38  }
39 
40  if(enable_haptic) {
41  init_subsystems |= SDL_INIT_HAPTIC;
42  }
43 
44  /* Enable standard application logging */
45  SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
46 
47  SDL_SetHint(SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS, "1");
48 
49  /* Initialize SDL (Note: video is required to start event loop) */
50  if (SDL_Init(init_subsystems) < 0) {
51  SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
52  exit(1);
53  }
54 
55  /*
56  //SDL_CreateWindow("Dummy", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 128, 128, 0);
57  */
58 
59  SDL_Log("There are %d joysticks at startup\n", SDL_NumJoysticks());
60  if (enable_haptic)
61  SDL_Log("There are %d haptic devices at startup\n", SDL_NumHaptics());
62 
63  while(keepGoing)
64  {
65  SDL_Event event;
66  while(SDL_PollEvent(&event))
67  {
68  switch(event.type)
69  {
70  case SDL_QUIT:
71  keepGoing = SDL_FALSE;
72  break;
73  case SDL_JOYDEVICEADDED:
74  if (joystick != NULL)
75  {
76  SDL_Log("Only one joystick supported by this test\n");
77  }
78  else
79  {
80  joystick = SDL_JoystickOpen(event.jdevice.which);
81  instance = SDL_JoystickInstanceID(joystick);
82  SDL_Log("Joy Added : %d : %s\n", event.jdevice.which, SDL_JoystickName(joystick));
83  if (enable_haptic)
84  {
85  if (SDL_JoystickIsHaptic(joystick))
86  {
87  haptic = SDL_HapticOpenFromJoystick(joystick);
88  if (haptic)
89  {
90  SDL_Log("Joy Haptic Opened\n");
91  if (SDL_HapticRumbleInit( haptic ) != 0)
92  {
93  SDL_Log("Could not init Rumble!: %s\n", SDL_GetError());
94  SDL_HapticClose(haptic);
95  haptic = NULL;
96  }
97  } else {
98  SDL_Log("Joy haptic open FAILED!: %s\n", SDL_GetError());
99  }
100  }
101  else
102  {
103  SDL_Log("No haptic found\n");
104  }
105  }
106  }
107  break;
108  case SDL_JOYDEVICEREMOVED:
109  if (instance == event.jdevice.which)
110  {
111  SDL_Log("Joy Removed: %d\n", event.jdevice.which);
112  instance = -1;
113  if(enable_haptic && haptic)
114  {
115  SDL_HapticClose(haptic);
116  haptic = NULL;
117  }
118  SDL_JoystickClose(joystick);
119  joystick = NULL;
120  } else {
121  SDL_Log("Unknown joystick diconnected\n");
122  }
123  break;
124  case SDL_JOYAXISMOTION:
125 /*
126 // SDL_Log("Axis Move: %d\n", event.jaxis.axis);
127 */
128  if (enable_haptic)
129  SDL_HapticRumblePlay(haptic, 0.25, 250);
130  break;
131  case SDL_JOYBUTTONDOWN:
132  SDL_Log("Button Press: %d\n", event.jbutton.button);
133  if(enable_haptic && haptic)
134  {
135  SDL_HapticRumblePlay(haptic, 0.25, 250);
136  }
137  if (event.jbutton.button == 0) {
138  SDL_Log("Exiting due to button press of button 0\n");
139  keepGoing = SDL_FALSE;
140  }
141  break;
142  case SDL_JOYBUTTONUP:
143  SDL_Log("Button Release: %d\n", event.jbutton.button);
144  break;
145  }
146  }
147  }
148 
149  SDL_Quit();
150 
151  return 0;
152 }
153 #else
154 
155 int
156 main(int argc, char *argv[])
157 {
158  SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL compiled without Joystick and haptic support.\n");
159  return 1;
160 }
161 
162 #endif