sys_linux.c

   1
   2 #ifdef WIN32
   3 #include "conio.h"
   4 #else
   5 #include <unistd.h>
   6 #include <fcntl.h>
   7 #include <sys/time.h>
   8 #endif
   9
  10 #include <signal.h>
  11
  12 #include "quakedef.h"
  13
  14
  15 #ifdef WIN32
  16 cvar_t sys_usetimegettime = {CVAR_SAVE, "sys_usetimegettime", "1"};
  17 #endif
  18
  19
  20
  21 // =======================================================================
  22 // General routines
  23 // =======================================================================
  24 void Sys_Shutdown (void)
  25 {
  26 #ifndef WIN32
  27         fcntl (0, F_SETFL, fcntl (0, F_GETFL, 0) & ~FNDELAY);
  28 #endif
  29         fflush(stdout);
  30 }
  31
  32 void Sys_Error (const char *error, ...)
  33 {
  34         va_list argptr;
  35         char string[1024];
  36
  37 // change stdin to non blocking
  38 #ifndef WIN32
  39         fcntl (0, F_SETFL, fcntl (0, F_GETFL, 0) & ~FNDELAY);
  40 #endif
  41
  42         va_start (argptr,error);
  43         dpvsnprintf (string, sizeof (string), error, argptr);
  44         va_end (argptr);
  45
  46         Con_Printf ("Quake Error: %s\n", string);
  47
  48         Host_Shutdown ();
  49         exit (1);
  50 }
  51
  52 void Sys_PrintToTerminal(const char *text)
  53 {
  54         fprintf(stdout, "%s", text);
  55 }
  56
  57 double Sys_DoubleTime (void)
  58 {
  59         static int first = true;
  60         static double oldtime = 0.0, curtime = 0.0;
  61         double newtime;
  62 #ifdef WIN32
  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)
  65         {
  66                 static int firsttimegettime = true;
  67                 // timeGetTime
  68                 // platform:
  69                 // Windows 95/98/ME/NT/2000/XP
  70                 // features:
  71                 // reasonable accuracy (millisecond)
  72                 // issues:
  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)
  74
  75                 // make sure the timer is high precision, otherwise different versions of windows have varying accuracy
  76                 if (firsttimegettime)
  77                 {
  78                         timeBeginPeriod (1);
  79                         firsttimegettime = false;
  80                 }
  81
  82                 newtime = (double) timeGetTime () / 1000.0;
  83         }
  84         else
  85         {
  86                 // QueryPerformanceCounter
  87                 // platform:
  88                 // Windows 95/98/ME/NT/2000/XP
  89                 // features:
  90                 // very accurate (CPU cycles)
  91                 // known issues:
  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)
  94                 double timescale;
  95                 LARGE_INTEGER PerformanceFreq;
  96                 LARGE_INTEGER PerformanceCount;
  97
  98                 if (!QueryPerformanceFrequency (&PerformanceFreq))
  99                 {
 100                         Con_Printf ("No hardware timer available");
 101                         // fall back to timeGetTime
 102                         Cvar_SetValueQuick(&sys_usetimegettime, true);
 103                         return Sys_DoubleTime();
 104                 }
 105                 QueryPerformanceCounter (&PerformanceCount);
 106
 107                 #ifdef __BORLANDC__
 108                 timescale = 1.0 / ((double) PerformanceFreq.u.LowPart + (double) PerformanceFreq.u.HighPart * 65536.0 * 65536.0);
 109                 newtime = ((double) PerformanceCount.u.LowPart + (double) PerformanceCount.u.HighPart * 65536.0 * 65536.0) * timescale;
 110                 #else
 111                 timescale = 1.0 / ((double) PerformanceFreq.LowPart + (double) PerformanceFreq.HighPart * 65536.0 * 65536.0);
 112                 newtime = ((double) PerformanceCount.LowPart + (double) PerformanceCount.HighPart * 65536.0 * 65536.0) * timescale;
 113                 #endif
 114         }
 115 #else
 116         struct timeval tp;
 117         gettimeofday(&tp, NULL);
 118         newtime = (double) tp.tv_sec + tp.tv_usec / 1000000.0;
 119 #endif
 120
 121         if (first)
 122         {
 123                 first = false;
 124                 oldtime = newtime;
 125         }
 126
 127         if (newtime < oldtime)
 128         {
 129                 // warn if it's significant
 130                 if (newtime - oldtime < -0.01)
 131                         Con_Printf("Sys_DoubleTime: time stepped backwards (went from %f to %f, difference %f)\n", oldtime, newtime, newtime - oldtime);
 132         }
 133         else
 134                 curtime += newtime - oldtime;
 135         oldtime = newtime;
 136
 137         return curtime;
 138 }
 139
 140 char *Sys_ConsoleInput(void)
 141 {
 142         if (cls.state == ca_dedicated)
 143         {
 144                 static char text[256];
 145                 static unsigned int len = 0;
 146 #ifdef WIN32
 147                 int c;
 148
 149                 // read a line out
 150                 while (_kbhit ())
 151                 {
 152                         c = _getch ();
 153                         if (c == '\r')
 154                         {
 155                                 text[len] = '\0';
 156                                 putch ('\n');
 157                                 len = 0;
 158                                 return text;
 159                         }
 160                         if (c == '\b')
 161                         {
 162                                 if (len)
 163                                 {
 164                                         putch (c);
 165                                         putch (' ');
 166                                         putch (c);
 167                                         len--;
 168                                 }
 169                                 continue;
 170                         }
 171                         if (len < sizeof (text) - 1)
 172                         {
 173                                 putch (c);
 174                                 text[len] = c;
 175                                 len++;
 176                         }
 177                 }
 178 #else
 179                 fd_set fdset;
 180                 struct timeval timeout;
 181                 FD_ZERO(&fdset);
 182                 FD_SET(0, &fdset); // stdin
 183                 timeout.tv_sec = 0;
 184                 timeout.tv_usec = 0;
 185                 if (select (1, &fdset, NULL, NULL, &timeout) != -1 && FD_ISSET(0, &fdset))
 186                 {
 187                         len = read (0, text, sizeof(text));
 188                         if (len >= 1)
 189                         {
 190                                 // rip off the \n and terminate
 191                                 text[len-1] = 0;
 192                                 return text;
 193                         }
 194                 }
 195 #endif
 196         }
 197         return NULL;
 198 }
 199
 200 void Sys_Sleep(int milliseconds)
 201 {
 202         if (milliseconds < 1)
 203                 milliseconds = 1;
 204 #ifdef WIN32
 205         Sleep(milliseconds);
 206 #else
 207         usleep(milliseconds * 1000);
 208 #endif
 209 }
 210
 211 char *Sys_GetClipboardData (void)
 212 {
 213         return NULL;
 214 }
 215
 216 void Sys_InitConsole (void)
 217 {
 218 }
 219
 220 void Sys_Init_Commands (void)
 221 {
 222 }
 223
 224 int main (int argc, char **argv)
 225 {
 226         double frameoldtime, framenewtime;
 227
 228         signal(SIGFPE, SIG_IGN);
 229
 230         com_argc = argc;
 231         com_argv = (const char **)argv;
 232
 233 #ifndef WIN32
 234         fcntl(0, F_SETFL, fcntl (0, F_GETFL, 0) | FNDELAY);
 235 #endif
 236
 237         Host_Init();
 238
 239         frameoldtime = Sys_DoubleTime () - 0.1;
 240         while (1)
 241         {
 242                 // find time spent rendering last frame
 243                 framenewtime = Sys_DoubleTime ();
 244
 245                 Host_Frame (framenewtime - frameoldtime);
 246
 247                 frameoldtime = framenewtime;
 248         }
 249         return 0;
 250 }