16 cvar_t sys_usetimegettime = {CVAR_SAVE, "sys_usetimegettime", "1"};
21 // =======================================================================
23 // =======================================================================
24 void Sys_Shutdown (void)
27 fcntl (0, F_SETFL, fcntl (0, F_GETFL, 0) & ~FNDELAY);
32 void Sys_Error (const char *error, ...)
37 // change stdin to non blocking
39 fcntl (0, F_SETFL, fcntl (0, F_GETFL, 0) & ~FNDELAY);
42 va_start (argptr,error);
43 dpvsnprintf (string, sizeof (string), error, argptr);
46 Con_Printf ("Quake Error: %s\n", string);
52 void Sys_PrintToTerminal(const char *text)
54 fprintf(stdout, "%s", text);
57 double Sys_DoubleTime (void)
59 static int first = true;
60 static double oldtime = 0.0, curtime = 0.0;
63 // LordHavoc: note to people modifying this code, DWORD is specifically defined as an unsigned 32bit number, therefore the 65536.0 * 65536.0 is fine.
64 if (sys_usetimegettime.integer)
66 static int firsttimegettime = true;
69 // Windows 95/98/ME/NT/2000/XP
71 // reasonable accuracy (millisecond)
73 // wraps around every 47 days or so (but this is non-fatal to us, odd times are rejected, only causes a one frame stutter)
75 // make sure the timer is high precision, otherwise different versions of windows have varying accuracy
79 firsttimegettime = false;
82 newtime = (double) timeGetTime () / 1000.0;
86 // QueryPerformanceCounter
88 // Windows 95/98/ME/NT/2000/XP
90 // very accurate (CPU cycles)
92 // does not necessarily match realtime too well (tends to get faster and faster in win98)
93 // wraps around occasionally on some platforms (depends on CPU speed and probably other unknown factors)
95 LARGE_INTEGER PerformanceFreq;
96 LARGE_INTEGER PerformanceCount;
98 if (!QueryPerformanceFrequency (&PerformanceFreq))
99 Sys_Error ("No hardware timer available");
100 QueryPerformanceCounter (&PerformanceCount);
103 timescale = 1.0 / ((double) PerformanceFreq.u.LowPart + (double) PerformanceFreq.u.HighPart * 65536.0 * 65536.0);
104 newtime = ((double) PerformanceCount.u.LowPart + (double) PerformanceCount.u.HighPart * 65536.0 * 65536.0) * timescale;
106 timescale = 1.0 / ((double) PerformanceFreq.LowPart + (double) PerformanceFreq.HighPart * 65536.0 * 65536.0);
107 newtime = ((double) PerformanceCount.LowPart + (double) PerformanceCount.HighPart * 65536.0 * 65536.0) * timescale;
112 gettimeofday(&tp, NULL);
113 newtime = (double) tp.tv_sec + tp.tv_usec / 1000000.0;
122 if (newtime < oldtime)
124 // warn if it's significant
125 if (newtime - oldtime < -0.01)
126 Con_Printf("Sys_DoubleTime: time stepped backwards (went from %f to %f, difference %f)\n", oldtime, newtime, newtime - oldtime);
129 curtime += newtime - oldtime;
135 char *Sys_ConsoleInput(void)
137 if (cls.state == ca_dedicated)
139 static char text[256];
166 if (len < sizeof (text) - 1)
175 struct timeval timeout;
177 FD_SET(0, &fdset); // stdin
180 if (select (1, &fdset, NULL, NULL, &timeout) != -1 && FD_ISSET(0, &fdset))
182 len = read (0, text, sizeof(text));
185 // rip off the \n and terminate
195 void Sys_Sleep(int milliseconds)
197 if (milliseconds < 1)
202 usleep(milliseconds * 1000);
206 char *Sys_GetClipboardData (void)
211 void Sys_InitConsole (void)
215 void Sys_Init_Commands (void)
219 int main (int argc, char **argv)
221 double frameoldtime, framenewtime;
223 signal(SIGFPE, SIG_IGN);
226 com_argv = (const char **)argv;
229 fcntl(0, F_SETFL, fcntl (0, F_GETFL, 0) | FNDELAY);
234 frameoldtime = Sys_DoubleTime () - 0.1;
237 // find time spent rendering last frame
238 framenewtime = Sys_DoubleTime ();
240 Host_Frame (framenewtime - frameoldtime);
242 frameoldtime = framenewtime;