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SDL_haptic.c
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SDL_haptic.c
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/*
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;
}
}
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;
}
/*
* Checks to see if the haptic device is valid
*/
static int
ValidHaptic(SDL_Haptic ** haptic)
{
int valid;
if (*haptic == NULL) {
SDL_SetError("Haptic device hasn't been opened yet");
valid = 0;
} else {
valid = 1;
}
return valid;
}
/*
* Closes a SDL_Haptic device.
*/
void
SDL_HapticClose(SDL_Haptic * haptic)
{
int i;
/* Must be valid */
if (!ValidHaptic(&haptic)) {
return;
}
/* Check if it's still in use */
if (--haptic->ref_count < 0) {
return;
}
/* Close it */
SDL_SYS_HapticClose(haptic);
/* Remove from the list */
for (i = 0; SDL_haptics[i]; ++i) {
if (haptic == SDL_haptics[i]) {
SDL_memcpy(&SDL_haptics[i], &SDL_haptics[i + 1],
(SDL_numhaptics - i) * sizeof(haptic));
break;
}
}
/* Free */
SDL_free(haptic);
}
/*
* Cleans up after the subsystem.
*/
void
SDL_HapticQuit(void)
{
SDL_numhaptics = 0;
SDL_SYS_HapticQuit();
if (SDL_haptics != NULL) {
SDL_free(SDL_haptics);
SDL_haptics = NULL;
}
}