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SDL_systimer.c
149 lines (117 loc) · 3.16 KB
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SDL_systimer.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2012 Sam Lantinga
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"
#ifdef SDL_TIMER_MINT
/*
* TOS/MiNT timer driver
* based on vbl vector
*
* Patrice Mandin
*/
#include <stdio.h>
#include <sys/time.h>
#include <signal.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <mint/cookie.h>
#include <mint/sysvars.h>
#include <mint/osbind.h>
#include <mint/mintbind.h>
#include "SDL_timer.h"
#include "../SDL_timer_c.h"
#include "SDL_thread.h"
#include "../../video/ataricommon/SDL_atarisuper.h"
#include "SDL_vbltimer_s.h"
/* from audio/mint */
void SDL_MintAudio_CheckFpu(void);
/* The first ticks value of the application */
static Uint32 start;
static SDL_bool read_hz200_from_vbl = SDL_FALSE;
static int mint_present; /* can we use Syield() ? */
void SDL_StartTicks(void)
{
void *old_stack;
long dummy;
/* Set first ticks value */
old_stack = (void *)Super(0);
start = *((volatile long *)_hz_200);
SuperToUser(old_stack);
start *= 5; /* One _hz_200 tic is 5ms */
mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND);
}
Uint32 SDL_GetTicks (void)
{
Uint32 now = start;
if (read_hz200_from_vbl) {
now = SDL_Atari_hz200;
} else {
void *old_stack = (void *)Super(0);
now = *((volatile long *)_hz_200);
SuperToUser(old_stack);
}
return((now*5)-start);
}
void SDL_Delay (Uint32 ms)
{
Uint32 now;
now = SDL_GetTicks();
while ((SDL_GetTicks()-now)<ms){
if (mint_present) {
Syield();
}
}
}
/* Data to handle a single periodic alarm */
static SDL_bool timer_installed=SDL_FALSE;
/* This is only called if the event thread is not running */
int SDL_SYS_TimerInit(void)
{
void *old_stack;
SDL_MintAudio_CheckFpu();
/* Install RunTimer in vbl vector */
old_stack = (void *)Super(0);
timer_installed = !SDL_AtariVblInstall(SDL_ThreadedTimerCheck);
SuperToUser(old_stack);
if (!timer_installed) {
return(-1);
}
read_hz200_from_vbl = SDL_TRUE;
return(SDL_SetTimerThreaded(0));
}
void SDL_SYS_TimerQuit(void)
{
/* Uninstall RunTimer vbl vector */
if (timer_installed) {
void *old_stack = (void *)Super(0);
SDL_AtariVblUninstall(SDL_ThreadedTimerCheck);
SuperToUser(old_stack);
timer_installed = SDL_FALSE;
}
read_hz200_from_vbl = SDL_FALSE;
}
int SDL_SYS_StartTimer(void)
{
SDL_SetError("Internal logic error: MiNT uses vbl timer");
return(-1);
}
void SDL_SYS_StopTimer(void)
{
return;
}
#endif /* SDL_TIMER_MINT */