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         vsnprintf (string, sizeof (string), error, argptr);
  44         va_end (argptr);
  45         fprintf(stderr, "Error: %s\n", string);
  46
  47         Con_Print ("Quake Error: ");
  48         Con_Print (string);
  49         Con_Print ("\n");
  50
  51         Host_Shutdown ();
  52         exit (1);
  53 }
  54
  55 void Sys_PrintToTerminal(const char *text)
  56 {
  57         printf("%s", text);
  58 }
  59
  60 double Sys_DoubleTime (void)
  61 {
  62         static int first = true;
  63         static double oldtime = 0.0, curtime = 0.0;
  64         double newtime;
  65 #ifdef WIN32
  66         // LordHavoc: note to people modifying this code, DWORD is specifically defined as an unsigned 32bit number, therefore the 65536.0 * 65536.0 is fine.
  67         if (sys_usetimegettime.integer)
  68         {
  69                 static int firsttimegettime = true;
  70                 // timeGetTime
  71                 // platform:
  72                 // Windows 95/98/ME/NT/2000/XP
  73                 // features:
  74                 // reasonable accuracy (millisecond)
  75                 // issues:
  76                 // wraps around every 47 days or so (but this is non-fatal to us, odd times are rejected, only causes a one frame stutter)
  77
  78                 // make sure the timer is high precision, otherwise different versions of windows have varying accuracy
  79                 if (firsttimegettime)
  80                 {
  81                         timeBeginPeriod (1);
  82                         firsttimegettime = false;
  83                 }
  84
  85                 newtime = (double) timeGetTime () / 1000.0;
  86         }
  87         else
  88         {
  89                 // QueryPerformanceCounter
  90                 // platform:
  91                 // Windows 95/98/ME/NT/2000/XP
  92                 // features:
  93                 // very accurate (CPU cycles)
  94                 // known issues:
  95                 // does not necessarily match realtime too well (tends to get faster and faster in win98)
  96                 // wraps around occasionally on some platforms (depends on CPU speed and probably other unknown factors)
  97                 double timescale;
  98                 LARGE_INTEGER PerformanceFreq;
  99                 LARGE_INTEGER PerformanceCount;
 100
 101                 if (!QueryPerformanceFrequency (&PerformanceFreq))
 102                         Sys_Error ("No hardware timer available");
 103                 QueryPerformanceCounter (&PerformanceCount);
 104
 105                 #ifdef __BORLANDC__
 106                 timescale = 1.0 / ((double) PerformanceFreq.u.LowPart + (double) PerformanceFreq.u.HighPart * 65536.0 * 65536.0);
 107                 newtime = ((double) PerformanceCount.u.LowPart + (double) PerformanceCount.u.HighPart * 65536.0 * 65536.0) * timescale;
 108                 #else
 109                 timescale = 1.0 / ((double) PerformanceFreq.LowPart + (double) PerformanceFreq.HighPart * 65536.0 * 65536.0);
 110                 newtime = ((double) PerformanceCount.LowPart + (double) PerformanceCount.HighPart * 65536.0 * 65536.0) * timescale;
 111                 #endif
 112         }
 113 #else
 114         struct timeval tp;
 115         gettimeofday(&tp, NULL);
 116         newtime = (double) tp.tv_sec + tp.tv_usec / 1000000.0;
 117 #endif
 118
 119         if (first)
 120         {
 121                 first = false;
 122                 oldtime = newtime;
 123         }
 124
 125         if (newtime < oldtime)
 126         {
 127                 // warn if it's significant
 128                 if (newtime - oldtime < -0.01)
 129                         Con_Printf("Sys_DoubleTime: time stepped backwards (went from %f to %f, difference %f)\n", oldtime, newtime, newtime - oldtime);
 130         }
 131         else
 132                 curtime += newtime - oldtime;
 133         oldtime = newtime;
 134
 135         return curtime;
 136 }
 137
 138 char *Sys_ConsoleInput(void)
 139 {
 140         if (cls.state == ca_dedicated)
 141         {
 142                 static char text[256];
 143                 static int len = 0;
 144 #ifdef WIN32
 145                 int c;
 146
 147                 // read a line out
 148                 while (_kbhit ())
 149                 {
 150                         c = _getch ();
 151                         if (c == '\r')
 152                         {
 153                                 text[len] = '\0';
 154                                 putch ('\n');
 155                                 len = 0;
 156                                 return text;
 157                         }
 158                         if (c == '\b')
 159                         {
 160                                 if (len)
 161                                 {
 162                                         putch (c);
 163                                         putch (' ');
 164                                         putch (c);
 165                                         len--;
 166                                 }
 167                                 continue;
 168                         }
 169                         if (len < sizeof (text) - 1)
 170                         {
 171                                 putch (c);
 172                                 text[len] = c;
 173                                 len++;
 174                         }
 175                 }
 176 #else
 177                 fd_set fdset;
 178                 struct timeval timeout;
 179                 FD_ZERO(&fdset);
 180                 FD_SET(0, &fdset); // stdin
 181                 timeout.tv_sec = 0;
 182                 timeout.tv_usec = 0;
 183                 if (select (1, &fdset, NULL, NULL, &timeout) != -1 && FD_ISSET(0, &fdset))
 184                 {
 185                         len = read (0, text, sizeof(text));
 186                         if (len >= 1)
 187                         {
 188                                 // rip off the \n and terminate
 189                                 text[len-1] = 0;
 190                                 return text;
 191                         }
 192                 }
 193 #endif
 194         }
 195         return NULL;
 196 }
 197
 198 void Sys_Sleep(int milliseconds)
 199 {
 200         if (milliseconds < 1)
 201                 milliseconds = 1;
 202 #ifdef WIN32
 203         Sleep(milliseconds);
 204 #else
 205         usleep(milliseconds * 1000);
 206 #endif
 207 }
 208
 209 char *Sys_GetClipboardData (void)
 210 {
 211         return NULL;
 212 }
 213
 214 int main (int argc, char **argv)
 215 {
 216         double frameoldtime, framenewtime;
 217
 218         signal(SIGFPE, SIG_IGN);
 219
 220         com_argc = argc;
 221         com_argv = (const char **)argv;
 222
 223 #ifndef WIN32
 224         fcntl(0, F_SETFL, fcntl (0, F_GETFL, 0) | FNDELAY);
 225 #endif
 226
 227         Sys_Shared_EarlyInit();
 228
 229         Host_Init();
 230
 231         Sys_Shared_LateInit();
 232
 233         frameoldtime = Sys_DoubleTime () - 0.1;
 234         while (1)
 235         {
 236                 // find time spent rendering last frame
 237                 framenewtime = Sys_DoubleTime ();
 238
 239                 Host_Frame (framenewtime - frameoldtime);
 240
 241                 frameoldtime = framenewtime;
 242         }
 243         return 0;
 244 }