testjoystick.c
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/*
Copyright (C) 1997-2016 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 routines */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "SDL.h"
#ifdef __EMSCRIPTEN__
#include <emscripten/emscripten.h>
#endif
#ifndef SDL_JOYSTICK_DISABLED
#ifdef __IPHONEOS__
#define SCREEN_WIDTH 320
#define SCREEN_HEIGHT 480
#else
#define SCREEN_WIDTH 640
#define SCREEN_HEIGHT 480
#endif
SDL_Renderer *screen = NULL;
SDL_bool retval = SDL_FALSE;
SDL_bool done = SDL_FALSE;
static void
DrawRect(SDL_Renderer *r, const int x, const int y, const int w, const int h)
{
const SDL_Rect area = { x, y, w, h };
SDL_RenderFillRect(r, &area);
}
void
loop(void *arg)
{
SDL_Event event;
int i;
SDL_Joystick *joystick = (SDL_Joystick *)arg;
/* blank screen, set up for drawing this frame. */
SDL_SetRenderDrawColor(screen, 0x0, 0x0, 0x0, SDL_ALPHA_OPAQUE);
SDL_RenderClear(screen);
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_JOYDEVICEREMOVED:
SDL_Log("Joystick device %d removed.\n", (int) event.jdevice.which);
SDL_Log("Our instance ID is %d\n", (int) SDL_JoystickInstanceID(joystick));
break;
case SDL_JOYAXISMOTION:
SDL_Log("Joystick %d axis %d value: %d\n",
event.jaxis.which,
event.jaxis.axis, event.jaxis.value);
break;
case SDL_JOYHATMOTION:
SDL_Log("Joystick %d hat %d value:",
event.jhat.which, event.jhat.hat);
if (event.jhat.value == SDL_HAT_CENTERED)
SDL_Log(" centered");
if (event.jhat.value & SDL_HAT_UP)
SDL_Log(" up");
if (event.jhat.value & SDL_HAT_RIGHT)
SDL_Log(" right");
if (event.jhat.value & SDL_HAT_DOWN)
SDL_Log(" down");
if (event.jhat.value & SDL_HAT_LEFT)
SDL_Log(" left");
SDL_Log("\n");
break;
case SDL_JOYBALLMOTION:
SDL_Log("Joystick %d ball %d delta: (%d,%d)\n",
event.jball.which,
event.jball.ball, event.jball.xrel, event.jball.yrel);
break;
case SDL_JOYBUTTONDOWN:
SDL_Log("Joystick %d button %d down\n",
event.jbutton.which, event.jbutton.button);
break;
case SDL_JOYBUTTONUP:
SDL_Log("Joystick %d button %d up\n",
event.jbutton.which, event.jbutton.button);
break;
case SDL_KEYDOWN:
if ((event.key.keysym.sym != SDLK_ESCAPE) &&
(event.key.keysym.sym != SDLK_AC_BACK)) {
break;
}
/* Fall through to signal quit */
case SDL_FINGERDOWN:
case SDL_MOUSEBUTTONDOWN:
case SDL_QUIT:
done = SDL_TRUE;
break;
default:
break;
}
}
/* Update visual joystick state */
SDL_SetRenderDrawColor(screen, 0x00, 0xFF, 0x00, SDL_ALPHA_OPAQUE);
for (i = 0; i < SDL_JoystickNumButtons(joystick); ++i) {
if (SDL_JoystickGetButton(joystick, i) == SDL_PRESSED) {
DrawRect(screen, (i%20) * 34, SCREEN_HEIGHT - 68 + (i/20) * 34, 32, 32);
}
}
SDL_SetRenderDrawColor(screen, 0xFF, 0x00, 0x00, SDL_ALPHA_OPAQUE);
for (i = 0; i < SDL_JoystickNumAxes(joystick); ++i) {
/* Draw the X/Y axis */
int x, y;
x = (((int) SDL_JoystickGetAxis(joystick, i)) + 32768);
x *= SCREEN_WIDTH;
x /= 65535;
if (x < 0) {
x = 0;
} else if (x > (SCREEN_WIDTH - 16)) {
x = SCREEN_WIDTH - 16;
}
++i;
if (i < SDL_JoystickNumAxes(joystick)) {
y = (((int) SDL_JoystickGetAxis(joystick, i)) + 32768);
} else {
y = 32768;
}
y *= SCREEN_HEIGHT;
y /= 65535;
if (y < 0) {
y = 0;
} else if (y > (SCREEN_HEIGHT - 16)) {
y = SCREEN_HEIGHT - 16;
}
DrawRect(screen, x, y, 16, 16);
}
SDL_SetRenderDrawColor(screen, 0x00, 0x00, 0xFF, SDL_ALPHA_OPAQUE);
for (i = 0; i < SDL_JoystickNumHats(joystick); ++i) {
/* Derive the new position */
int x = SCREEN_WIDTH/2;
int y = SCREEN_HEIGHT/2;
const Uint8 hat_pos = SDL_JoystickGetHat(joystick, i);
if (hat_pos & SDL_HAT_UP) {
y = 0;
} else if (hat_pos & SDL_HAT_DOWN) {
y = SCREEN_HEIGHT-8;
}
if (hat_pos & SDL_HAT_LEFT) {
x = 0;
} else if (hat_pos & SDL_HAT_RIGHT) {
x = SCREEN_WIDTH-8;
}
DrawRect(screen, x, y, 8, 8);
}
SDL_RenderPresent(screen);
if (SDL_JoystickGetAttached( joystick ) == 0) {
done = SDL_TRUE;
retval = SDL_TRUE; /* keep going, wait for reattach. */
}
#ifdef __EMSCRIPTEN__
if (done) {
emscripten_cancel_main_loop();
}
#endif
}
static SDL_bool
WatchJoystick(SDL_Joystick * joystick)
{
SDL_Window *window = NULL;
const char *name = NULL;
retval = SDL_FALSE;
done = SDL_FALSE;
/* Create a window to display joystick axis position */
window = SDL_CreateWindow("Joystick Test", SDL_WINDOWPOS_CENTERED,
SDL_WINDOWPOS_CENTERED, SCREEN_WIDTH,
SCREEN_HEIGHT, 0);
if (window == NULL) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create window: %s\n", SDL_GetError());
return SDL_FALSE;
}
screen = SDL_CreateRenderer(window, -1, 0);
if (screen == NULL) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create renderer: %s\n", SDL_GetError());
SDL_DestroyWindow(window);
return SDL_FALSE;
}
SDL_SetRenderDrawColor(screen, 0x00, 0x00, 0x00, SDL_ALPHA_OPAQUE);
SDL_RenderClear(screen);
SDL_RenderPresent(screen);
SDL_RaiseWindow(window);
/* Print info about the joystick we are watching */
name = SDL_JoystickName(joystick);
SDL_Log("Watching joystick %d: (%s)\n", SDL_JoystickInstanceID(joystick),
name ? name : "Unknown Joystick");
SDL_Log("Joystick has %d axes, %d hats, %d balls, and %d buttons\n",
SDL_JoystickNumAxes(joystick), SDL_JoystickNumHats(joystick),
SDL_JoystickNumBalls(joystick), SDL_JoystickNumButtons(joystick));
/* Loop, getting joystick events! */
#ifdef __EMSCRIPTEN__
emscripten_set_main_loop_arg(loop, joystick, 0, 1);
#else
while (!done) {
loop(joystick);
}
#endif
SDL_DestroyRenderer(screen);
screen = NULL;
SDL_DestroyWindow(window);
return retval;
}
int
main(int argc, char *argv[])
{
const char *name;
int i;
SDL_Joystick *joystick;
SDL_SetHint(SDL_HINT_ACCELEROMETER_AS_JOYSTICK, "0");
/* Enable standard application logging */
SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
/* Initialize SDL (Note: video is required to start event loop) */
if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK) < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
exit(1);
}
/* Print information about the joysticks */
SDL_Log("There are %d joysticks attached\n", SDL_NumJoysticks());
for (i = 0; i < SDL_NumJoysticks(); ++i) {
name = SDL_JoystickNameForIndex(i);
SDL_Log("Joystick %d: %s\n", i, name ? name : "Unknown Joystick");
joystick = SDL_JoystickOpen(i);
if (joystick == NULL) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL_JoystickOpen(%d) failed: %s\n", i,
SDL_GetError());
} else {
char guid[64];
SDL_assert(SDL_JoystickFromInstanceID(SDL_JoystickInstanceID(joystick)) == joystick);
SDL_JoystickGetGUIDString(SDL_JoystickGetGUID(joystick),
guid, sizeof (guid));
SDL_Log(" axes: %d\n", SDL_JoystickNumAxes(joystick));
SDL_Log(" balls: %d\n", SDL_JoystickNumBalls(joystick));
SDL_Log(" hats: %d\n", SDL_JoystickNumHats(joystick));
SDL_Log(" buttons: %d\n", SDL_JoystickNumButtons(joystick));
SDL_Log("instance id: %d\n", SDL_JoystickInstanceID(joystick));
SDL_Log(" guid: %s\n", guid);
SDL_JoystickClose(joystick);
}
}
#if defined(__ANDROID__) || defined(__IPHONEOS__)
if (SDL_NumJoysticks() > 0) {
#else
if (argv[1]) {
#endif
SDL_bool reportederror = SDL_FALSE;
SDL_bool keepGoing = SDL_TRUE;
SDL_Event event;
int device;
#if defined(__ANDROID__) || defined(__IPHONEOS__)
device = 0;
#else
device = atoi(argv[1]);
#endif
joystick = SDL_JoystickOpen(device);
if (joystick != NULL) {
SDL_assert(SDL_JoystickFromInstanceID(SDL_JoystickInstanceID(joystick)) == joystick);
}
while ( keepGoing ) {
if (joystick == NULL) {
if ( !reportederror ) {
SDL_Log("Couldn't open joystick %d: %s\n", device, SDL_GetError());
keepGoing = SDL_FALSE;
reportederror = SDL_TRUE;
}
} else {
reportederror = SDL_FALSE;
keepGoing = WatchJoystick(joystick);
SDL_JoystickClose(joystick);
}
joystick = NULL;
if (keepGoing) {
SDL_Log("Waiting for attach\n");
}
while (keepGoing) {
SDL_WaitEvent(&event);
if ((event.type == SDL_QUIT) || (event.type == SDL_FINGERDOWN)
|| (event.type == SDL_MOUSEBUTTONDOWN)) {
keepGoing = SDL_FALSE;
} else if (event.type == SDL_JOYDEVICEADDED) {
joystick = SDL_JoystickOpen(device);
if (joystick != NULL) {
SDL_assert(SDL_JoystickFromInstanceID(SDL_JoystickInstanceID(joystick)) == joystick);
}
break;
}
}
}
}
SDL_QuitSubSystem(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK);
return 0;
}
#else
int
main(int argc, char *argv[])
{
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL compiled without Joystick support.\n");
exit(1);
}
#endif
SDL_JOYBUTTONUP
Definition: SDL_events.h:112
done
SDL_bool done
Definition: testjoystick.c:37
SDL_JoyAxisEvent::value
Sint16 value
Definition: SDL_events.h:285
SDL_JoyButtonEvent::which
SDL_JoystickID which
Definition: SDL_events.h:332
SDL_JOYHATMOTION
Definition: SDL_events.h:110
SDL_WINDOWPOS_CENTERED
#define SDL_WINDOWPOS_CENTERED
Definition: SDL_video.h:129
SDL_PollEvent
#define SDL_PollEvent
Definition: SDL_dynapi_overrides.h:128
SDL_KEYDOWN
Definition: SDL_events.h:93
SDL_JoystickGetButton
#define SDL_JoystickGetButton
Definition: SDL_dynapi_overrides.h:220
SDL_GetError
#define SDL_GetError
Definition: SDL_dynapi_overrides.h:119
SDL_Event::jdevice
SDL_JoyDeviceEvent jdevice
Definition: SDL_events.h:536
SDL_JoystickClose
#define SDL_JoystickClose
Definition: SDL_dynapi_overrides.h:221
SDL_JoyAxisEvent::axis
Uint8 axis
Definition: SDL_events.h:281
r
GLdouble GLdouble GLdouble r
Definition: SDL_opengl.h:2072
SDL_JoystickGetGUID
#define SDL_JoystickGetGUID
Definition: SDL_dynapi_overrides.h:206
SDL_INIT_JOYSTICK
#define SDL_INIT_JOYSTICK
Definition: SDL.h:78
SDL_Event::jbutton
SDL_JoyButtonEvent jbutton
Definition: SDL_events.h:535
x
GLint GLint GLint GLint GLint x
Definition: SDL_opengl.h:1567
window
SDL_Window * window
Definition: testautomation_render.c:26
SDL_JoyBallEvent::ball
Uint8 ball
Definition: SDL_events.h:297
SDL_JOYDEVICEADDED
Definition: SDL_events.h:113
SDL_RenderFillRect
#define SDL_RenderFillRect
Definition: SDL_dynapi_overrides.h:347
SDL_QuitSubSystem
#define SDL_QuitSubSystem
Definition: SDL_dynapi_overrides.h:62
SDL_JoystickNameForIndex
#define SDL_JoystickNameForIndex
Definition: SDL_dynapi_overrides.h:202
SDL_MOUSEBUTTONDOWN
Definition: SDL_events.h:103
SDL_Event::jball
SDL_JoyBallEvent jball
Definition: SDL_events.h:533
SDL_QUIT
Definition: SDL_events.h:60
SDL_JoyAxisEvent::which
SDL_JoystickID which
Definition: SDL_events.h:280
DrawRect
static void DrawRect(SDL_Renderer *r, const int x, const int y, const int w, const int h)
Definition: testjoystick.c:40
SDL_Renderer
Definition: SDL_sysrender.h:76
SDL_JoystickOpen
#define SDL_JoystickOpen
Definition: SDL_dynapi_overrides.h:203
SDL_JoyBallEvent::xrel
Sint16 xrel
Definition: SDL_events.h:301
SDL_NumJoysticks
#define SDL_NumJoysticks
Definition: SDL_dynapi_overrides.h:201
SDL_JoystickNumButtons
#define SDL_JoystickNumButtons
Definition: SDL_dynapi_overrides.h:214
SDL_JOYBALLMOTION
Definition: SDL_events.h:109
SDL_CreateWindow
#define SDL_CreateWindow
Definition: SDL_dynapi_overrides.h:518
name
GLuint const GLchar * name
Definition: SDL_opengl_glext.h:660
SDL_JOYAXISMOTION
Definition: SDL_events.h:108
SDL_JoystickGetGUIDString
#define SDL_JoystickGetGUIDString
Definition: SDL_dynapi_overrides.h:207
SDL_JoystickInstanceID
#define SDL_JoystickInstanceID
Definition: SDL_dynapi_overrides.h:210
SDL_JoystickGetHat
#define SDL_JoystickGetHat
Definition: SDL_dynapi_overrides.h:218
SDL_JoystickName
#define SDL_JoystickName
Definition: SDL_dynapi_overrides.h:204
SDL_LogError
#define SDL_LogError
Definition: SDL_dynapi_overrides.h:42
SDL_JoystickNumAxes
#define SDL_JoystickNumAxes
Definition: SDL_dynapi_overrides.h:211
SDL_JOYDEVICEREMOVED
Definition: SDL_events.h:114
SDL_bool
SDL_bool
Definition: SDL_stdinc.h:126
SCREEN_WIDTH
#define SCREEN_WIDTH
Definition: testjoystick.c:31
SDL_HAT_RIGHT
#define SDL_HAT_RIGHT
Definition: SDL_joystick.h:209
SDL_JoyBallEvent::which
SDL_JoystickID which
Definition: SDL_events.h:296
SDL_Log
#define SDL_Log
Definition: SDL_dynapi_overrides.h:37
SDL_JoystickFromInstanceID
#define SDL_JoystickFromInstanceID
Definition: SDL_dynapi_overrides.h:599
SDL_FINGERDOWN
Definition: SDL_events.h:125
SDL_HINT_ACCELEROMETER_AS_JOYSTICK
#define SDL_HINT_ACCELEROMETER_AS_JOYSTICK
A variable controlling whether the Android / iOS built-in accelerometer should be listed as a joystic...
Definition: SDL_hints.h:289
y
GLint GLint GLint GLint GLint GLint y
Definition: SDL_opengl.h:1567
SDL_JOYBUTTONDOWN
Definition: SDL_events.h:111
SDL_HAT_LEFT
#define SDL_HAT_LEFT
Definition: SDL_joystick.h:211
SDL_Event::jaxis
SDL_JoyAxisEvent jaxis
Definition: SDL_events.h:532
Uint8
uint8_t Uint8
An unsigned 8-bit integer type.
Definition: SDL_stdinc.h:139
event
struct _cl_event * event
Definition: SDL_opengl_glext.h:2649
SDL_RaiseWindow
#define SDL_RaiseWindow
Definition: SDL_dynapi_overrides.h:539
SCREEN_HEIGHT
#define SCREEN_HEIGHT
Definition: testjoystick.c:32
main
int main(int argc, char *argv[])
Definition: testjoystick.c:240
SDL_JoystickGetAttached
#define SDL_JoystickGetAttached
Definition: SDL_dynapi_overrides.h:209
retval
SDL_bool retval
Definition: testjoystick.c:36
SDL_LOG_PRIORITY_INFO
Definition: SDL_log.h:106
SDL_KeyboardEvent::keysym
SDL_Keysym keysym
Definition: SDL_events.h:196
SDL_TRUE
Definition: SDL_stdinc.h:129
screen
SDL_Renderer * screen
Definition: testjoystick.c:35
i
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:42
SDL_assert
#define SDL_assert(condition)
Definition: SDL_assert.h:167
SDL_LogSetPriority
#define SDL_LogSetPriority
Definition: SDL_dynapi_overrides.h:242
NULL
#define NULL
Definition: begin_code.h:143
SDL_JoystickNumHats
#define SDL_JoystickNumHats
Definition: SDL_dynapi_overrides.h:213
SDL_WaitEvent
#define SDL_WaitEvent
Definition: SDL_dynapi_overrides.h:129
SDL_JoystickGetAxis
#define SDL_JoystickGetAxis
Definition: SDL_dynapi_overrides.h:217
SDL_JoyHatEvent::hat
Uint8 hat
Definition: SDL_events.h:313
SDL_RenderClear
#define SDL_RenderClear
Definition: SDL_dynapi_overrides.h:340
SDL_JoyDeviceEvent::which
Sint32 which
Definition: SDL_events.h:346
SDL_Event::key
SDL_KeyboardEvent key
Definition: SDL_events.h:526
SDL_SetHint
#define SDL_SetHint
Definition: SDL_dynapi_overrides.h:196
SDL_Window
The type used to identify a window.
Definition: SDL_sysvideo.h:71
SDL_JoystickNumBalls
#define SDL_JoystickNumBalls
Definition: SDL_dynapi_overrides.h:212
SDL_FALSE
Definition: SDL_stdinc.h:128
SDL_JoyHatEvent::value
Uint8 value
Definition: SDL_events.h:314
loop
void loop(void *arg)
Definition: testjoystick.c:47
SDL_Keysym::sym
SDL_Keycode sym
Definition: SDL_keyboard.h:50
x0
GLuint GLfloat x0
Definition: SDL_opengl_glext.h:8583
SDLK_AC_BACK
Definition: SDL_keycode.h:296
SDL_Init
#define SDL_Init
Definition: SDL_dynapi_overrides.h:60
WatchJoystick
static SDL_bool WatchJoystick(SDL_Joystick *joystick)
Definition: testjoystick.c:187
SDL_Event
General event structure.
Definition: SDL_events.h:521
SDL_SetRenderDrawColor
#define SDL_SetRenderDrawColor
Definition: SDL_dynapi_overrides.h:336
w
GLubyte GLubyte GLubyte GLubyte w
Definition: SDL_opengl_glext.h:731
SDL_DestroyRenderer
#define SDL_DestroyRenderer
Definition: SDL_dynapi_overrides.h:354
SDL_PRESSED
#define SDL_PRESSED
Definition: SDL_events.h:50
SDL_JoyBallEvent::yrel
Sint16 yrel
Definition: SDL_events.h:302
SDL_Event::jhat
SDL_JoyHatEvent jhat
Definition: SDL_events.h:534
SDL_JoyButtonEvent::button
Uint8 button
Definition: SDL_events.h:333
SDL_HAT_CENTERED
#define SDL_HAT_CENTERED
Definition: SDL_joystick.h:207
SDLK_ESCAPE
Definition: SDL_keycode.h:52
SDL_ALPHA_OPAQUE
#define SDL_ALPHA_OPAQUE
Definition: SDL_pixels.h:45
SDL.h
SDL_HAT_UP
#define SDL_HAT_UP
Definition: SDL_joystick.h:208
SDL_DestroyWindow
#define SDL_DestroyWindow
Definition: SDL_dynapi_overrides.h:553
SDL_HAT_DOWN
#define SDL_HAT_DOWN
Definition: SDL_joystick.h:210
SDL_LOG_CATEGORY_APPLICATION
Definition: SDL_log.h:66
SDL_JoyHatEvent::which
SDL_JoystickID which
Definition: SDL_events.h:312
h
GLfloat GLfloat GLfloat GLfloat h
Definition: SDL_opengl_glext.h:1946
SDL_INIT_VIDEO
#define SDL_INIT_VIDEO
Definition: SDL.h:77
SDL_CreateRenderer
#define SDL_CreateRenderer
Definition: SDL_dynapi_overrides.h:307
SDL_Rect
A rectangle, with the origin at the upper left.
Definition: SDL_rect.h:64
SDL_RenderPresent
#define SDL_RenderPresent
Definition: SDL_dynapi_overrides.h:352
SDL_Event::type
Uint32 type
Definition: SDL_events.h:523