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                         Sys_Error ("No hardware timer available");
 100                 QueryPerformanceCounter (&PerformanceCount);
 101
 102                 #ifdef __BORLANDC__
 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;
 105                 #else
 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;
 108                 #endif
 109         }
 110 #else
 111         struct timeval tp;
 112         gettimeofday(&tp, NULL);
 113         newtime = (double) tp.tv_sec + tp.tv_usec / 1000000.0;
 114 #endif
 115
 116         if (first)
 117         {
 118                 first = false;
 119                 oldtime = newtime;
 120         }
 121
 122         if (newtime < oldtime)
 123         {
 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);
 127         }
 128         else
 129                 curtime += newtime - oldtime;
 130         oldtime = newtime;
 131
 132         return curtime;
 133 }
 134
 135 char *Sys_ConsoleInput(void)
 136 {
 137         if (cls.state == ca_dedicated)
 138         {
 139                 static char text[256];
 140                 static int len = 0;
 141 #ifdef WIN32
 142                 int c;
 143
 144                 // read a line out
 145                 while (_kbhit ())
 146                 {
 147                         c = _getch ();
 148                         if (c == '\r')
 149                         {
 150                                 text[len] = '\0';
 151                                 putch ('\n');
 152                                 len = 0;
 153                                 return text;
 154                         }
 155                         if (c == '\b')
 156                         {
 157                                 if (len)
 158                                 {
 159                                         putch (c);
 160                                         putch (' ');
 161                                         putch (c);
 162                                         len--;
 163                                 }
 164                                 continue;
 165                         }
 166                         if (len < sizeof (text) - 1)
 167                         {
 168                                 putch (c);
 169                                 text[len] = c;
 170                                 len++;
 171                         }
 172                 }
 173 #else
 174                 fd_set fdset;
 175                 struct timeval timeout;
 176                 FD_ZERO(&fdset);
 177                 FD_SET(0, &fdset); // stdin
 178                 timeout.tv_sec = 0;
 179                 timeout.tv_usec = 0;
 180                 if (select (1, &fdset, NULL, NULL, &timeout) != -1 && FD_ISSET(0, &fdset))
 181                 {
 182                         len = read (0, text, sizeof(text));
 183                         if (len >= 1)
 184                         {
 185                                 // rip off the \n and terminate
 186                                 text[len-1] = 0;
 187                                 return text;
 188                         }
 189                 }
 190 #endif
 191         }
 192         return NULL;
 193 }
 194
 195 void Sys_Sleep(int milliseconds)
 196 {
 197         if (milliseconds < 1)
 198                 milliseconds = 1;
 199 #ifdef WIN32
 200         Sleep(milliseconds);
 201 #else
 202         usleep(milliseconds * 1000);
 203 #endif
 204 }
 205
 206 char *Sys_GetClipboardData (void)
 207 {
 208         return NULL;
 209 }
 210
 211 void Sys_InitConsole (void)
 212 {
 213 }
 214
 215 void Sys_Init_Commands (void)
 216 {
 217 }
 218
 219 int main (int argc, char **argv)
 220 {
 221         double frameoldtime, framenewtime;
 222
 223         signal(SIGFPE, SIG_IGN);
 224
 225         com_argc = argc;
 226         com_argv = (const char **)argv;
 227
 228 #ifndef WIN32
 229         fcntl(0, F_SETFL, fcntl (0, F_GETFL, 0) | FNDELAY);
 230 #endif
 231
 232         Host_Init();
 233
 234         frameoldtime = Sys_DoubleTime () - 0.1;
 235         while (1)
 236         {
 237                 // find time spent rendering last frame
 238                 framenewtime = Sys_DoubleTime ();
 239
 240                 Host_Frame (framenewtime - frameoldtime);
 241
 242                 frameoldtime = framenewtime;
 243         }
 244         return 0;
 245 }