src/haptic/SDL_haptic.c
author Edgar Simo <bobbens@gmail.com>
Sun, 01 Jun 2008 18:46:51 +0000
branchgsoc2008_force_feedback
changeset 2474 3f80bf1528b4
parent 2472 3f73c88c9abb
child 2475 4b874e3a3a2c
permissions -rw-r--r--
Properly quit the SDL_haptic subsystem. Added SDL_Haptic dummy driver.

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 2008 Edgar Simo

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

#include "SDL_haptic_c.h"
#include "SDL_syshaptic.h"


static Uint8 SDL_numhaptics = 0;
SDL_Haptic **SDL_haptics = NULL;
static SDL_Haptic *default_haptic = NULL;


/*
 * Initializes the Haptic devices.
 */
int
SDL_HapticInit(void)
{  
   int arraylen;
   int status;

   SDL_numhaptics = 0;
   status = SDL_SYS_HapticInit();
   if (status >= 0) {
      arraylen = (status + 1) * sizeof(*SDL_haptics);
      SDL_haptics = (SDL_Haptic **) SDL_malloc(arraylen);
      if (SDL_haptics == NULL) {
         SDL_numhaptics = 0;
      } else {
         SDL_memset(SDL_haptics, 0, arraylen);
         SDL_numhaptics = status;
      }
      status = 0;
   }
   default_haptic = NULL;

   return status;
}


/*
 * Returns the number of available devices.
 */
int
SDL_NumHaptics(void)
{
   return SDL_numhaptics;
}


/*
 * Gets the name of a Haptic device by index.
 */
const char *
SDL_HapticName(int device_index)
{
   if ((device_index < 0) || (device_index >= SDL_numhaptics)) {
      SDL_SetError("There are %d haptic devices available", SDL_numhaptics);
      return NULL;
   }
   return SDL_SYS_HapticName(device_index);
}


/*
 * Opens a Haptic device
 */
SDL_Haptic *
SDL_HapticOpen(int device_index)
{
   int i;
   SDL_Haptic *haptic;

   if ((device_index < 0) || (device_index >= SDL_numhaptics)) {
      SDL_SetError("There are %d haptic devices available", SDL_numhaptics);
      return NULL;
   }

   /* If the haptic is already open, return it */
   for (i = 0; SDL_haptics[i]; ++i) {             
      if (device_index == SDL_haptics[i]->index) {
         haptic = SDL_haptics[i];
         ++haptic->ref_count;
         return haptic;
      }
   }

   /* Create and initialize the haptic */
   haptic = (SDL_Haptic *) SDL_malloc((sizeof *haptic));
   if (haptic != NULL) {
      SDL_memset(haptic, 0, (sizeof *haptic));
      haptic->index = device_index;
      if (SDL_SYS_HapticOpen(haptic) < 0) {
         SDL_free(haptic);
         haptic = NULL;
      } else {
      }
   }
   if (haptic) {
      /* Add haptic to list */
      ++haptic->ref_count;
      for (i = 0; SDL_haptics[i]; ++i)
         /* Skip to next haptic */ ;
      SDL_haptics[i] = haptic;
   }
   return haptic;
}


void
SDL_HapticQuit(void)
{
   SDL_numhaptics = 0;

   SDL_SYS_HapticQuit();
   if (SDL_haptics != NULL) {
      SDL_free(SDL_haptics);
      SDL_haptics = NULL;
   }
}