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/* ScummVM - Scumm Interpreter
* Copyright (C) 2004 The ScummVM project
*
* The ReInherit Engine is (C)2000-2003 by Daniel Balsom.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program 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 General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*
*/
#include "reinherit.h"
#include <SDL.h>
#include "systimer.h"
namespace Saga {
struct R_SYSTIMER {
int t_running;
unsigned long t_interval;
void *t_param;
R_SYSTIMER_CALLBACK t_callback_f;
SDL_TimerID t_sdl_timerid;
};
struct R_SYSTIMER_DATA {
int initialized;
uint32 t_start_ticks;
uint32 t_current_ticks;
uint32 t_previous_ticks;
};
static R_SYSTIMER_DATA R_TimerData;
static Uint32 SYSTIMER_Callback(Uint32 interval, void *param);
int SYSTIMER_InitMSCounter() {
if (R_TimerData.initialized) {
return R_FAILURE;
}
R_TimerData.t_previous_ticks = SDL_GetTicks();
R_TimerData.initialized = 1;
return R_SUCCESS;
}
unsigned long SYSTIMER_ReadMSCounter() {
Uint32 ms_elapsed = 0;
if (!R_TimerData.initialized) {
return 0;
}
R_TimerData.t_current_ticks = SDL_GetTicks();
if (R_TimerData.t_current_ticks < R_TimerData.t_previous_ticks) {
// Timer has rolled over after 49 days
} else {
ms_elapsed = R_TimerData.t_current_ticks - R_TimerData.t_previous_ticks;
R_TimerData.t_previous_ticks = R_TimerData.t_current_ticks;
}
return ms_elapsed;
}
int SYSTIMER_ResetMSCounter() {
if (!R_TimerData.initialized) {
return R_FAILURE;
}
R_TimerData.t_previous_ticks = SDL_GetTicks();
return R_SUCCESS;
}
int SYSTIMER_Sleep(uint16 msec) {
SDL_Delay(msec);
return R_SUCCESS;
}
int SYSTIMER_CreateTimer(R_SYSTIMER **timer, unsigned long interval, void *param, R_SYSTIMER_CALLBACK callback) {
R_SYSTIMER *new_timer = (R_SYSTIMER *)malloc(sizeof *new_timer);
if (new_timer == NULL) {
return R_MEM;
}
new_timer->t_interval = interval;
new_timer->t_param = param;
new_timer->t_callback_f = callback;
*timer = new_timer;
new_timer->t_sdl_timerid = SDL_AddTimer(interval, SYSTIMER_Callback, new_timer);
if (new_timer->t_sdl_timerid == NULL) {
free(new_timer);
*timer = NULL;
return R_FAILURE;
}
return R_SUCCESS;
}
int SYSTIMER_DestroyTimer(R_SYSTIMER *timer) {
if (timer == NULL) {
return R_FAILURE;
}
timer->t_running = 0;
SDL_RemoveTimer(timer->t_sdl_timerid);
free(timer);
return R_SUCCESS;
}
Uint32 SYSTIMER_Callback(Uint32 interval, void *param) {
R_SYSTIMER *timer_p = (R_SYSTIMER *)param;
timer_p->t_callback_f(timer_p->t_interval, timer_p->t_param);
return timer_p->t_interval;
}
} // End of namespace Saga
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