SDL  2.0
testsensor.c
Go to the documentation of this file.
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 test of the SDL sensor code */
14 
15 #include "SDL.h"
16 
17 static const char *GetSensorTypeString(SDL_SensorType type)
18 {
19  static char unknown_type[64];
20 
21  switch (type)
22  {
23  case SDL_SENSOR_INVALID:
24  return "SDL_SENSOR_INVALID";
25  case SDL_SENSOR_UNKNOWN:
26  return "SDL_SENSOR_UNKNOWN";
27  case SDL_SENSOR_ACCEL:
28  return "SDL_SENSOR_ACCEL";
29  case SDL_SENSOR_GYRO:
30  return "SDL_SENSOR_GYRO";
31  default:
32  SDL_snprintf(unknown_type, sizeof(unknown_type), "UNKNOWN (%d)", type);
33  return unknown_type;
34  }
35 }
36 
37 static void HandleSensorEvent(SDL_SensorEvent *event)
38 {
39  SDL_Sensor *sensor = SDL_SensorFromInstanceID(event->which);
40  if (!sensor) {
41  SDL_Log("Couldn't get sensor for sensor event\n");
42  return;
43  }
44 
45  switch (SDL_SensorGetType(sensor)) {
46  case SDL_SENSOR_ACCEL:
47  SDL_Log("Accelerometer update: %.2f, %.2f, %.2f\n", event->data[0], event->data[1], event->data[2]);
48  break;
49  case SDL_SENSOR_GYRO:
50  SDL_Log("Gyro update: %.2f, %.2f, %.2f\n", event->data[0], event->data[1], event->data[2]);
51  break;
52  default:
53  SDL_Log("Sensor update for sensor type %s\n", GetSensorTypeString(SDL_SensorGetType(sensor)));
54  break;
55  }
56 }
57 
58 int
59 main(int argc, char **argv)
60 {
61  int i;
62  int num_sensors, num_opened;
63 
64  /* Load the SDL library */
65  if (SDL_Init(SDL_INIT_SENSOR) < 0) {
66  SDL_Log("Couldn't initialize SDL: %s\n", SDL_GetError());
67  return (1);
68  }
69 
70  num_sensors = SDL_NumSensors();
71  num_opened = 0;
72 
73  SDL_Log("There are %d sensors available\n", num_sensors);
74  for (i = 0; i < num_sensors; ++i) {
75  SDL_Log("Sensor %d: %s, type %s, platform type %d\n",
76  SDL_SensorGetDeviceInstanceID(i),
77  SDL_SensorGetDeviceName(i),
78  GetSensorTypeString(SDL_SensorGetDeviceType(i)),
79  SDL_SensorGetDeviceNonPortableType(i));
80 
81  if (SDL_SensorGetDeviceType(i) != SDL_SENSOR_UNKNOWN) {
82  SDL_Sensor *sensor = SDL_SensorOpen(i);
83  if (sensor == NULL) {
84  SDL_Log("Couldn't open sensor %d: %s\n", SDL_SensorGetDeviceInstanceID(i), SDL_GetError());
85  } else {
86  ++num_opened;
87  }
88  }
89  }
90  SDL_Log("Opened %d sensors\n", num_opened);
91 
92  if (num_opened > 0) {
93  SDL_bool done = SDL_FALSE;
94  SDL_Event event;
95 
96  SDL_CreateWindow("Sensor Test", 0, 0, 0, 0, SDL_WINDOW_FULLSCREEN_DESKTOP);
97  while (!done) {
98  while (SDL_PollEvent(&event) > 0) {
99  switch (event.type) {
100  case SDL_SENSORUPDATE:
101  HandleSensorEvent(&event.sensor);
102  break;
103  case SDL_MOUSEBUTTONUP:
104  case SDL_KEYUP:
105  case SDL_QUIT:
106  done = SDL_TRUE;
107  break;
108  default:
109  break;
110  }
111  }
112  }
113  }
114 
115  SDL_Quit();
116  return (0);
117 }