//This rewrites internal variables, and must be threadsafe
void Timer_Manager::Frame() {
if (FPSLimit > 0.0f) {
while (Time() - lastftime < 1.0f / FPSLimit) Thread.Sleep();
lastftime = Time();
}
LockID timerLock = Thread.EnterLock(MUTEX_TIMER);
float rdt = (_curtime() - lasttime); //real delta
dt = min(0.5f,rdt); //clamped to prevent deltatime spikes
lasttime = _curtime();
totalFrames++;
curfps = 1 / rdt;
Thread.LeaveLock(timerLock);
}
static METACACHE_RECORD* _cache_lookup(METACACHE_FS_PRIV* fspriv, const char* filename)
{
METACACHE_RECORD* rec;
// FIXME: do a lookup
if ((hash_retrieve(&(fspriv->cache), (char*)filename, (void**)&rec)) && (rec!=NULL))
{
if ((rec->mtime+CACHE_TIMEOUT) > _curtime())
{
DEBUGMSG("cached: %s", filename);
return rec;
}
DEBUGMSG("purging old cache record for %s", filename);
mvfs_stat_free(rec->stat);
rec->stat = NULL;
return rec;
}
// ... lookup failed - no record yet
rec = calloc(1,sizeof(METACACHE_RECORD));
rec->filename = strdup(filename);
// now insert
hash_insert(&(fspriv->cache),rec->filename,rec);
return rec;
}
//FIXME: this one isn't really needed
void Timer_Manager::Initialize() {
LockID timerLock = Thread.EnterLock(MUTEX_TIMER);
starttime = _curtime();
lasttime = starttime;
timeRunning = true;
FPSLimit = 0.0f;
lastftime = lasttime;
Thread.LeaveLock(timerLock);
}
static void _cache_clear(METACACHE_RECORD* rec)
{
if (rec == NULL)
{
DEBUGMSG("NULL rec passed");
return;
}
rec->mtime = _curtime();
mvfs_stat_free(rec->stat);
rec->stat = NULL;
}
float Timer_Manager::Time() {
return (_curtime()-starttime);
}
static void _cache_set(METACACHE_RECORD* rec, MVFS_STAT* st)
{
rec->mtime = _curtime();
mvfs_stat_free(rec->stat);
rec->stat = (st ? mvfs_stat_dup(st) : NULL);
}
