SDL_bejoystick.cc
资源名称:NETVIDEO.rar [点击查看]
上传用户:sun1608
上传日期:2007-02-02
资源大小:6116k
文件大小:7k
源码类别:
流媒体/Mpeg4/MP4
开发平台:
Visual C++
- /*
- SDL - Simple DirectMedia Layer
- Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public
- License as published by the Free Software Foundation; either
- version 2 of the License, or (at your option) any later version.
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with this library; if not, write to the Free
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- Sam Lantinga
- slouken@libsdl.org
- */
- #ifdef SAVE_RCSID
- static char rcsid =
- "@(#) $Id: SDL_bejoystick.cc,v 1.4 2002/04/22 21:38:02 wmay Exp $";
- #endif
- /* This is the system specific header for the SDL joystick API */
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <be/support/String.h>
- #include <be/device/Joystick.h>
- extern "C" {
- #include "SDL_error.h"
- #include "SDL_joystick.h"
- #include "SDL_sysjoystick.h"
- #include "SDL_joystick_c.h"
- /* The maximum number of joysticks we'll detect */
- #define MAX_JOYSTICKS 16
- /* A list of available joysticks */
- static char *SDL_joyport[MAX_JOYSTICKS];
- static char *SDL_joyname[MAX_JOYSTICKS];
- /* The private structure used to keep track of a joystick */
- struct joystick_hwdata {
- BJoystick *stick;
- uint8 *new_hats;
- int16 *new_axes;
- };
- /* Function to scan the system for joysticks.
- * This function should set SDL_numjoysticks to the number of available
- * joysticks. Joystick 0 should be the system default joystick.
- * It should return 0, or -1 on an unrecoverable fatal error.
- */
- int SDL_SYS_JoystickInit(void)
- {
- BJoystick joystick;
- int numjoysticks;
- int i;
- int32 nports;
- char name[B_OS_NAME_LENGTH];
- /* Search for attached joysticks */
- nports = joystick.CountDevices();
- numjoysticks = 0;
- memset(SDL_joyport, 0, (sizeof SDL_joyport));
- memset(SDL_joyname, 0, (sizeof SDL_joyname));
- for ( i=0; (SDL_numjoysticks < MAX_JOYSTICKS) && (i < nports); ++i ) {
- if ( joystick.GetDeviceName(i, name) == B_OK ) {
- if ( joystick.Open(name) != B_ERROR ) {
- BString stick_name;
- joystick.GetControllerName(&stick_name);
- SDL_joyport[numjoysticks] = strdup(name);
- SDL_joyname[numjoysticks] =
- strdup(stick_name.String());
- numjoysticks++;
- joystick.Close();
- }
- }
- }
- return(numjoysticks);
- }
- /* Function to get the device-dependent name of a joystick */
- const char *SDL_SYS_JoystickName(int index)
- {
- return SDL_joyname[index];
- }
- /* Function to open a joystick for use.
- The joystick to open is specified by the index field of the joystick.
- This should fill the nbuttons and naxes fields of the joystick structure.
- It returns 0, or -1 if there is an error.
- */
- int SDL_SYS_JoystickOpen(SDL_Joystick *joystick)
- {
- BJoystick *stick;
- /* Create the joystick data structure */
- joystick->hwdata = (struct joystick_hwdata *)
- malloc(sizeof(*joystick->hwdata));
- if ( joystick->hwdata == NULL ) {
- SDL_OutOfMemory();
- return(-1);
- }
- memset(joystick->hwdata, 0, sizeof(*joystick->hwdata));
- stick = new BJoystick;
- joystick->hwdata->stick = stick;
- /* Open the requested joystick for use */
- if ( stick->Open(SDL_joyport[joystick->index]) == B_ERROR ) {
- SDL_SetError("Unable to open joystick");
- SDL_SYS_JoystickClose(joystick);
- return(-1);
- }
- /* Set the joystick to calibrated mode */
- stick->EnableCalibration();
- /* Get the number of buttons, hats, and axes on the joystick */
- joystick->nbuttons = stick->CountButtons();
- joystick->naxes = stick->CountAxes();
- joystick->nhats = stick->CountHats();
- joystick->hwdata->new_axes = (int16 *)
- malloc(joystick->naxes*sizeof(int16));
- joystick->hwdata->new_hats = (uint8 *)
- malloc(joystick->nhats*sizeof(uint8));
- if ( ! joystick->hwdata->new_hats || ! joystick->hwdata->new_axes ) {
- SDL_OutOfMemory();
- SDL_SYS_JoystickClose(joystick);
- return(-1);
- }
- /* We're done! */
- return(0);
- }
- /* Function to update the state of a joystick - called as a device poll.
- * This function shouldn't update the joystick structure directly,
- * but instead should call SDL_PrivateJoystick*() to deliver events
- * and update joystick device state.
- */
- void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick)
- {
- static const Uint8 hat_map[9] = {
- SDL_HAT_CENTERED,
- SDL_HAT_UP,
- SDL_HAT_RIGHTUP,
- SDL_HAT_RIGHT,
- SDL_HAT_RIGHTDOWN,
- SDL_HAT_DOWN,
- SDL_HAT_LEFTDOWN,
- SDL_HAT_LEFT,
- SDL_HAT_LEFTUP
- };
- const int JITTER = (32768/10); /* 10% jitter threshold (ok?) */
- BJoystick *stick;
- int i, change;
- int16 *axes;
- uint8 *hats;
- uint32 buttons;
- /* Set up data pointers */
- stick = joystick->hwdata->stick;
- axes = joystick->hwdata->new_axes;
- hats = joystick->hwdata->new_hats;
- /* Get the new joystick state */
- stick->Update();
- stick->GetAxisValues(axes);
- stick->GetHatValues(hats);
- buttons = stick->ButtonValues();
- /* Generate axis motion events */
- for ( i=0; i<joystick->naxes; ++i ) {
- change = ((int32)axes[i] - joystick->axes[i]);
- if ( (change > JITTER) || (change < -JITTER) ) {
- SDL_PrivateJoystickAxis(joystick, i, axes[i]);
- }
- }
- /* Generate hat change events */
- for ( i=0; i<joystick->nhats; ++i ) {
- if ( hats[i] != joystick->hats[i] ) {
- SDL_PrivateJoystickHat(joystick, i, hat_map[hats[i]]);
- }
- }
- /* Generate button events */
- for ( i=0; i<joystick->nbuttons; ++i ) {
- if ( (buttons&0x01) != joystick->buttons[i] ) {
- SDL_PrivateJoystickButton(joystick, i, (buttons&0x01));
- }
- buttons >>= 1;
- }
- }
- /* Function to close a joystick after use */
- void SDL_SYS_JoystickClose(SDL_Joystick *joystick)
- {
- if ( joystick->hwdata ) {
- joystick->hwdata->stick->Close();
- delete joystick->hwdata->stick;
- if ( joystick->hwdata->new_hats ) {
- free(joystick->hwdata->new_hats);
- }
- if ( joystick->hwdata->new_axes ) {
- free(joystick->hwdata->new_axes);
- }
- free(joystick->hwdata);
- joystick->hwdata = NULL;
- }
- }
- /* Function to perform any system-specific joystick related cleanup */
- void SDL_SYS_JoystickQuit(void)
- {
- int i;
- for ( i=0; SDL_joyport[i]; ++i ) {
- free(SDL_joyport[i]);
- }
- SDL_joyport[0] = NULL;
- for ( i=0; SDL_joyname[i]; ++i ) {
- free(SDL_joyname[i]);
- }
- SDL_joyname[0] = NULL;
- }
- }; // extern "C"