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Simple DirectMedia Layer
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Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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#include "SDL_config.h"
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#ifdef SDL_JOYSTICK_BEOS
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/* This is the system specific header for the SDL joystick API */
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#include <be/support/String.h>
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#include <be/device/Joystick.h>
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#include "SDL_joystick.h"
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#include "../SDL_sysjoystick.h"
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#include "../SDL_joystick_c.h"
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/* The maximum number of joysticks we'll detect */
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#define MAX_JOYSTICKS 16
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/* A list of available joysticks */
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static char *SDL_joyport[MAX_JOYSTICKS];
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static char *SDL_joyname[MAX_JOYSTICKS];
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/* The private structure used to keep track of a joystick */
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struct joystick_hwdata
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static int SDL_SYS_numjoysticks = 0;
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/* Function to scan the system for joysticks.
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* This function should set SDL_numjoysticks to the number of available
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* joysticks. Joystick 0 should be the system default joystick.
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* It should return 0, or -1 on an unrecoverable fatal error.
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int SDL_SYS_JoystickInit(void)
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char name[B_OS_NAME_LENGTH];
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/* Search for attached joysticks */
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nports = joystick.CountDevices();
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SDL_SYS_numjoysticks = 0;
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SDL_memset(SDL_joyport, 0, (sizeof SDL_joyport));
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SDL_memset(SDL_joyname, 0, (sizeof SDL_joyname));
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for (i = 0; (SDL_SYS_numjoysticks < MAX_JOYSTICKS) && (i < nports); ++i)
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if (joystick.GetDeviceName(i, name) == B_OK) {
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if (joystick.Open(name) != B_ERROR) {
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joystick.GetControllerName(&stick_name);
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SDL_joyport[SDL_SYS_numjoysticks] = strdup(name);
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SDL_joyname[SDL_SYS_numjoysticks] = strdup(stick_name.String());
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SDL_SYS_numjoysticks++;
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return (SDL_SYS_numjoysticks);
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int SDL_SYS_NumJoysticks()
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return SDL_SYS_numjoysticks;
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void SDL_SYS_JoystickDetect()
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SDL_bool SDL_SYS_JoystickNeedsPolling()
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/* Function to get the device-dependent name of a joystick */
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const char *SDL_SYS_JoystickNameForDeviceIndex(int device_index)
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return SDL_joyname[device_index];
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/* Function to perform the mapping from device index to the instance id for this index */
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SDL_JoystickID SDL_SYS_GetInstanceIdOfDeviceIndex(int device_index)
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/* Function to open a joystick for use.
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The joystick to open is specified by the index field of the joystick.
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This should fill the nbuttons and naxes fields of the joystick structure.
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It returns 0, or -1 if there is an error.
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int SDL_SYS_JoystickOpen(SDL_Joystick * joystick, int device_index)
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/* Create the joystick data structure */
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joystick->instance_id = device_index;
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joystick->hwdata = (struct joystick_hwdata *)
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SDL_malloc(sizeof(*joystick->hwdata));
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if (joystick->hwdata == NULL) {
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return SDL_OutOfMemory();
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SDL_memset(joystick->hwdata, 0, sizeof(*joystick->hwdata));
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stick = new BJoystick;
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joystick->hwdata->stick = stick;
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/* Open the requested joystick for use */
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if (stick->Open(SDL_joyport[device_index]) == B_ERROR) {
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SDL_SYS_JoystickClose(joystick);
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return SDL_SetError("Unable to open joystick");
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/* Set the joystick to calibrated mode */
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stick->EnableCalibration();
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/* Get the number of buttons, hats, and axes on the joystick */
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joystick->nbuttons = stick->CountButtons();
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joystick->naxes = stick->CountAxes();
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joystick->nhats = stick->CountHats();
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joystick->hwdata->new_axes = (int16 *)
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SDL_malloc(joystick->naxes * sizeof(int16));
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joystick->hwdata->new_hats = (uint8 *)
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SDL_malloc(joystick->nhats * sizeof(uint8));
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if (!joystick->hwdata->new_hats || !joystick->hwdata->new_axes) {
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SDL_SYS_JoystickClose(joystick);
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return SDL_OutOfMemory();
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/* Function to determine is this joystick is attached to the system right now */
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SDL_bool SDL_SYS_JoystickAttached(SDL_Joystick *joystick)
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/* Function to update the state of a joystick - called as a device poll.
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* This function shouldn't update the joystick structure directly,
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* but instead should call SDL_PrivateJoystick*() to deliver events
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* and update joystick device state.
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void SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)
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static const Uint8 hat_map[9] = {
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const int JITTER = (32768 / 10); /* 10% jitter threshold (ok?) */
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/* Set up data pointers */
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stick = joystick->hwdata->stick;
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axes = joystick->hwdata->new_axes;
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hats = joystick->hwdata->new_hats;
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/* Get the new joystick state */
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stick->GetAxisValues(axes);
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stick->GetHatValues(hats);
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buttons = stick->ButtonValues();
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/* Generate axis motion events */
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for (i = 0; i < joystick->naxes; ++i) {
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change = ((int32) axes[i] - joystick->axes[i]);
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if ((change > JITTER) || (change < -JITTER)) {
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SDL_PrivateJoystickAxis(joystick, i, axes[i]);
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/* Generate hat change events */
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for (i = 0; i < joystick->nhats; ++i) {
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if (hats[i] != joystick->hats[i]) {
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SDL_PrivateJoystickHat(joystick, i, hat_map[hats[i]]);
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/* Generate button events */
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for (i = 0; i < joystick->nbuttons; ++i) {
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if ((buttons & 0x01) != joystick->buttons[i]) {
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SDL_PrivateJoystickButton(joystick, i, (buttons & 0x01));
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/* Function to close a joystick after use */
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void SDL_SYS_JoystickClose(SDL_Joystick * joystick)
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if (joystick->hwdata) {
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joystick->hwdata->stick->Close();
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delete joystick->hwdata->stick;
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SDL_free(joystick->hwdata->new_hats);
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SDL_free(joystick->hwdata->new_axes);
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SDL_free(joystick->hwdata);
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joystick->hwdata = NULL;
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/* Function to perform any system-specific joystick related cleanup */
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void SDL_SYS_JoystickQuit(void)
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for (i = 0; SDL_joyport[i]; ++i) {
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SDL_free(SDL_joyport[i]);
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SDL_joyport[0] = NULL;
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for (i = 0; SDL_joyname[i]; ++i) {
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SDL_free(SDL_joyname[i]);
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SDL_joyname[0] = NULL;
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SDL_JoystickGUID SDL_SYS_JoystickGetDeviceGUID( int device_index )
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SDL_JoystickGUID guid;
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/* the GUID is just the first 16 chars of the name for now */
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const char *name = SDL_SYS_JoystickNameForDeviceIndex( device_index );
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SDL_memcpy( &guid, name, SDL_min( sizeof(guid), SDL_strlen( name ) ) );
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SDL_JoystickGUID SDL_SYS_JoystickGetGUID(SDL_Joystick * joystick)
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SDL_JoystickGUID guid;
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/* the GUID is just the first 16 chars of the name for now */
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const char *name = joystick->name;
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SDL_memcpy( &guid, name, SDL_min( sizeof(guid), SDL_strlen( name ) ) );
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#endif /* SDL_JOYSTICK_BEOS */
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/* vi: set ts=4 sw=4 expandtab: */
added
removed
src/joystick/beos/SDL_bejoystick.cc
