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don't seek while backing up over demotime. gzipped demos no longer slow down as 

the demo progresses (this will probably also be good for eventual dzip
support).
This commit is contained in:
Bill Currie 2000-12-19 20:33:06 +00:00
parent 0e268f9ca7
commit 24a76ef439
1 changed files with 15 additions and 8 deletions
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23
source/cl_demo.c
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@ -175,10 +175,17 @@ CL_GetDemoMessage (void)
float demotime;
byte c;
usercmd_t *pcmd;
static int demotime_cached;
static float cached_demotime;
// read the time from the packet
Qread (cls.demofile, &demotime, sizeof (demotime));
demotime = LittleFloat (demotime);
if (demotime_cached) {
demotime = cached_demotime;
demotime_cached = 0;
} else {
Qread (cls.demofile, &demotime, sizeof (demotime));
demotime = LittleFloat (demotime);
}
// decide if it is time to grab the next message
if (cls.timedemo) {
@ -187,8 +194,8 @@ CL_GetDemoMessage (void)
else if (demotime > cls.td_lastframe) {
cls.td_lastframe = demotime;
// rewind back to time
Qseek (cls.demofile, Qtell (cls.demofile) - sizeof (demotime),
SEEK_SET);
demotime_cached = 1;
cached_demotime = demotime;
return 0; // allready read this frame's message
}
if (!cls.td_starttime && cls.state == ca_active) {
@ -203,13 +210,13 @@ CL_GetDemoMessage (void)
// too far back
realtime = demotime - 1.0;
// rewind back to time
Qseek (cls.demofile, Qtell (cls.demofile) - sizeof (demotime),
SEEK_SET);
demotime_cached = 1;
cached_demotime = demotime;
return 0;
} else if (realtime < demotime) {
// rewind back to time
Qseek (cls.demofile, Qtell (cls.demofile) - sizeof (demotime),
SEEK_SET);
demotime_cached = 1;
cached_demotime = demotime;
return 0; // don't need another message yet
}
} else