System layer is greatly simplified and framecap
logic has been moved internally. I_Sleep now
takes a sleep duration and I_SleepDuration
generically implements a precise sleep with spin
loop.
Time is now tracked internally in the game using I_GetPreciseTime
and I_UpdateTime. I_Time now pulls from this internal timer. The
system code no longer needs to keep track of time itself.
This significantly improves frame and tic timing in interp mode,
resulting in a much smoother image with essentially no judder at
any framerate.
- Disabled VSync, due to the numerous problems it has.
- Instead, added an FPS cap.
- Frame interpolation is now tied to fpscap != 35.
- By default, the FPS cap is set to the monitor's refresh rate.
- Rewrote the FPS counter.
(This also consolidates several more commits ahead of this
fixing various issues. -eid)
Previously interpolated from last 35th of a second, which
may be offset from game time due to connection lag.
Consider this the proper fix to 54148a0dd0 too.
Ditched signal_handler to avoid worrying about async-signal-safe functions.
D_QuitNetGame is not called, so players whose programs are interrupted by a
signal will time out from the server. Because the game runs in a child process,
the window can close before the "Signal Caught" text box appears.
"(core dumped)" is also included in the message if core dumping could be
determined.
