static void snd_callback(void *userdata, Uint8 * stream, int len)
{
static int lasttime;
static float lastfreq;
int i;
swsndupdate();
// lasttime stores the time offset from the last call
// we save the time so that the multiple time slices
// all fit together smoothly
// if we have changed frequency since last time, we need
// to adjust lasttime to the new frequency
lasttime *= (int)(lastfreq / current_freq);
for (i = 0; i < len; ++i) {
if (speaker_on) {
stream[i] =
127 * (int)square_wave(current_freq *
(i + lasttime));
} else {
stream[i] = 0;
}
}
lasttime += len;
lastfreq = current_freq;
}
int swgetc()
{
int i;
while(!(i = Vid_GetKey())) {
// sdh 15/11/2001: dont thrash the processor while
// waiting for a key press
Timer_Sleep(100);
swsndupdate();
if (ctlbreak())
break;
}
return i;
}
int swmain(int argc, char *argv[])
{
int nexttic;
nobjects = (OBJECTS *) malloc(100 * sizeof(OBJECTS));
swinit(argc, argv);
setjmp(envrestart);
// sdh 28/10/2001: playmode is called from here now
// makes for a more coherent progression through the setup process
if (!playmode)
getgamemode();
swinitlevel();
nexttic = Timer_GetMS();
skip_time = 0;
for (;;) {
int nowtime;
/* generate a new move command periodically
* and send to other players if neccessary */
nowtime = Timer_GetMS();
if (nowtime > nexttic
&& latest_player_time[player] - countmove < MAX_NET_LAG) {
new_move();
/* Be accurate (exact amount between tics);
* However, if a large spike occurs between tics,
* catch up immediately.
*/
if (nowtime - nexttic > 1000)
nexttic = nowtime + (1000/FPS);
else
nexttic += (1000 / FPS);
// wait a bit longer to compensate for lag
nexttic += skip_time;
skip_time = 0;
}
asynupdate();
swsndupdate();
/* if we have all the tic commands we need, we can move */
if (can_move()) {
calculate_lag();
//dump_cmds();
swmove();
swdisp();
swcollsn();
swsound();
}
// sdh 15/11/2001: dont thrash the
// processor while waiting
Timer_Sleep(10);
}
return 0;
}