mirror of
https://github.com/libretro/scummvm.git
synced 2025-02-03 09:23:37 +00:00
169 lines
3.2 KiB
C++
169 lines
3.2 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2004 The ScummVM project
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*
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* The ReInherit Engine is (C)2000-2003 by Daniel Balsom.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*
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*/
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#include "reinherit.h"
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#include <SDL.h>
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/*
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* Begin module
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\*--------------------------------------------------------------------------*/
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#include "systimer.h"
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namespace Saga {
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struct R_SYSTIMER {
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int t_running;
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unsigned long t_interval;
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void *t_param;
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R_SYSTIMER_CALLBACK t_callback_f;
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SDL_TimerID t_sdl_timerid;
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};
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struct R_SYSTIMER_DATA {
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int initialized;
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Uint32 t_start_ticks;
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Uint32 t_current_ticks;
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Uint32 t_previous_ticks;
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};
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static R_SYSTIMER_DATA R_TimerData;
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static Uint32 SYSTIMER_Callback(Uint32 interval, void *param);
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int SYSTIMER_InitMSCounter(void)
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{
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if (R_TimerData.initialized) {
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return R_FAILURE;
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}
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R_TimerData.t_previous_ticks = SDL_GetTicks();
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R_TimerData.initialized = 1;
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return R_SUCCESS;
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}
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unsigned long SYSTIMER_ReadMSCounter(void)
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{
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Uint32 ms_elapsed = 0;
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if (!R_TimerData.initialized) {
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return 0;
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}
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R_TimerData.t_current_ticks = SDL_GetTicks();
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if (R_TimerData.t_current_ticks < R_TimerData.t_previous_ticks) {
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/* Timer has rolled over after 49 days... */
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} else {
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ms_elapsed = R_TimerData.t_current_ticks -
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R_TimerData.t_previous_ticks;
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R_TimerData.t_previous_ticks = R_TimerData.t_current_ticks;
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}
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return ms_elapsed;
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}
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int SYSTIMER_ResetMSCounter(void)
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{
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if (!R_TimerData.initialized) {
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return R_FAILURE;
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}
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R_TimerData.t_previous_ticks = SDL_GetTicks();
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return R_SUCCESS;
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}
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int SYSTIMER_Sleep(uint msec)
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{
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SDL_Delay(msec);
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return R_SUCCESS;
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}
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int
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SYSTIMER_CreateTimer(R_SYSTIMER ** timer,
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unsigned long interval, void *param, R_SYSTIMER_CALLBACK callback)
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{
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R_SYSTIMER *new_timer = (R_SYSTIMER *)malloc(sizeof *new_timer);
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if (new_timer == NULL) {
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return R_MEM;
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}
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new_timer->t_interval = interval;
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new_timer->t_param = param;
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new_timer->t_callback_f = callback;
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*timer = new_timer;
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new_timer->t_sdl_timerid = SDL_AddTimer(interval,
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SYSTIMER_Callback, new_timer);
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if (new_timer->t_sdl_timerid == NULL) {
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free(new_timer);
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*timer = NULL;
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return R_FAILURE;
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}
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return R_SUCCESS;
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}
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int SYSTIMER_DestroyTimer(R_SYSTIMER * timer)
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{
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if (timer == NULL) {
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return R_FAILURE;
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}
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timer->t_running = 0;
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SDL_RemoveTimer(timer->t_sdl_timerid);
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free(timer);
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return R_SUCCESS;
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}
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Uint32 SYSTIMER_Callback(Uint32 interval, void *param)
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{
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R_SYSTIMER *timer_p = (R_SYSTIMER *)param;
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timer_p->t_callback_f(timer_p->t_interval, timer_p->t_param);
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return timer_p->t_interval;
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}
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} // End of namespace Saga
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