sys_sdl.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 #include <SDL.h>
  15
  16 #ifdef WIN32
  17 cvar_t sys_usetimegettime = {CVAR_SAVE, "sys_usetimegettime", "1"};
  18 #endif
  19
  20 // =======================================================================
  21 // General routines
  22 // =======================================================================
  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         SDL_Quit();
  31 }
  32
  33
  34 void Sys_Error (const char *error, ...)
  35 {
  36         va_list argptr;
  37         char string[1024];
  38
  39 // change stdin to non blocking
  40 #ifndef WIN32
  41         fcntl (0, F_SETFL, fcntl (0, F_GETFL, 0) & ~FNDELAY);
  42 #endif
  43
  44         va_start (argptr,error);
  45         dpvsnprintf (string, sizeof (string), error, argptr);
  46         va_end (argptr);
  47         fprintf(stderr, "Error: %s\n", string);
  48
  49         Con_Print ("Quake Error: ");
  50         Con_Print (string);
  51         Con_Print ("\n");
  52
  53         Host_Shutdown ();
  54         exit (1);
  55 }
  56
  57 void Sys_PrintToTerminal(const char *text)
  58 {
  59         printf("%s", text);
  60 }
  61
  62 double Sys_DoubleTime (void)
  63 {
  64         static int first = true;
  65         static double oldtime = 0.0, curtime = 0.0;
  66         double newtime;
  67 #ifdef WIN32
  68         // LordHavoc: note to people modifying this code, DWORD is specifically defined as an unsigned 32bit number, therefore the 65536.0 * 65536.0 is fine.
  69         if (!sys_usetimegettime.integer)
  70         {
  71                 // QueryPerformanceCounter
  72                 // platform:
  73                 // Windows 95/98/ME/NT/2000/XP
  74                 // features:
  75                 // very accurate (CPU cycles)
  76                 // known issues:
  77                 // does not necessarily match realtime too well (tends to get faster and faster in win98)
  78                 // wraps around occasionally on some platforms (depends on CPU speed and probably other unknown factors)
  79                 double timescale;
  80                 LARGE_INTEGER PerformanceFreq;
  81                 LARGE_INTEGER PerformanceCount;
  82
  83                 if (!QueryPerformanceFrequency (&PerformanceFreq))
  84                         Sys_Error ("No hardware timer available");
  85                 QueryPerformanceCounter (&PerformanceCount);
  86
  87                 #ifdef __BORLANDC__
  88                 timescale = 1.0 / ((double) PerformanceFreq.u.LowPart + (double) PerformanceFreq.u.HighPart * 65536.0 * 65536.0);
  89                 newtime = ((double) PerformanceCount.u.LowPart + (double) PerformanceCount.u.HighPart * 65536.0 * 65536.0) * timescale;
  90                 #else
  91                 timescale = 1.0 / ((double) PerformanceFreq.LowPart + (double) PerformanceFreq.HighPart * 65536.0 * 65536.0);
  92                 newtime = ((double) PerformanceCount.LowPart + (double) PerformanceCount.HighPart * 65536.0 * 65536.0) * timescale;
  93                 #endif
  94         } else
  95 #endif
  96         newtime = (double) SDL_GetTicks() / 1000.0;
  97
  98
  99         if (first)
 100         {
 101                 first = false;
 102                 oldtime = newtime;
 103         }
 104
 105         if (newtime < oldtime)
 106         {
 107                 // warn if it's significant
 108                 if (newtime - oldtime < -0.01)
 109                         Con_Printf("Sys_DoubleTime: time stepped backwards (went from %f to %f, difference %f)\n", oldtime, newtime, newtime - oldtime);
 110         }
 111         else
 112                 curtime += newtime - oldtime;
 113         oldtime = newtime;
 114
 115         return curtime;
 116 }
 117
 118 char *Sys_ConsoleInput(void)
 119 {
 120         if (cls.state == ca_dedicated)
 121         {
 122                 static char text[256];
 123                 int len = 0;
 124 #ifdef WIN32
 125                 int c;
 126
 127                 // read a line out
 128                 while (_kbhit ())
 129                 {
 130                         c = _getch ();
 131                         putch (c);
 132                         if (c == '\r')
 133                         {
 134                                 text[len] = 0;
 135                                 putch ('\n');
 136                                 len = 0;
 137                                 return text;
 138                         }
 139                         if (c == 8)
 140                         {
 141                                 if (len)
 142                                 {
 143                                         putch (' ');
 144                                         putch (c);
 145                                         len--;
 146                                         text[len] = 0;
 147                                 }
 148                                 continue;
 149                         }
 150                         text[len] = c;
 151                         len++;
 152                         text[len] = 0;
 153                         if (len == sizeof (text))
 154                                 len = 0;
 155                 }
 156 #else
 157                 fd_set fdset;
 158                 struct timeval timeout;
 159                 FD_ZERO(&fdset);
 160                 FD_SET(0, &fdset); // stdin
 161                 timeout.tv_sec = 0;
 162                 timeout.tv_usec = 0;
 163                 if (select (1, &fdset, NULL, NULL, &timeout) != -1 && FD_ISSET(0, &fdset))
 164                 {
 165                         len = read (0, text, sizeof(text));
 166                         if (len >= 1)
 167                         {
 168                                 // rip off the \n and terminate
 169                                 text[len-1] = 0;
 170                                 return text;
 171                         }
 172                 }
 173 #endif
 174         }
 175         return NULL;
 176 }
 177
 178 void Sys_Sleep(int milliseconds)
 179 {
 180         if (milliseconds < 1)
 181                 milliseconds = 1;
 182         SDL_Delay(milliseconds);
 183 }
 184
 185 char *Sys_GetClipboardData (void)
 186 {
 187 #ifdef WIN32
 188         char *data = NULL;
 189         char *cliptext;
 190
 191         if (OpenClipboard (NULL) != 0)
 192         {
 193                 HANDLE hClipboardData;
 194
 195                 if ((hClipboardData = GetClipboardData (CF_TEXT)) != 0)
 196                 {
 197                         if ((cliptext = GlobalLock (hClipboardData)) != 0)
 198                         {
 199                                 data = malloc (GlobalSize(hClipboardData)+1);
 200                                 strcpy (data, cliptext);
 201                                 GlobalUnlock (hClipboardData);
 202                         }
 203                 }
 204                 CloseClipboard ();
 205         }
 206         return data;
 207 #else
 208         return NULL;
 209 #endif
 210 }
 211
 212 int main (int argc, char *argv[])
 213 {
 214         double frameoldtime, framenewtime;
 215
 216         signal(SIGFPE, SIG_IGN);
 217
 218         com_argc = argc;
 219         com_argv = (const char **)argv;
 220
 221 #ifndef WIN32
 222         fcntl(0, F_SETFL, fcntl (0, F_GETFL, 0) | FNDELAY);
 223 #endif
 224
 225         Sys_Shared_EarlyInit();
 226
 227 #ifdef WIN32
 228         Cvar_RegisterVariable(&sys_usetimegettime);
 229 #endif
 230
 231         Host_Init();
 232
 233         Sys_Shared_LateInit();
 234
 235         frameoldtime = Sys_DoubleTime () - 0.1;
 236         while (1)
 237         {
 238                 // find time spent rendering last frame
 239                 framenewtime = Sys_DoubleTime ();
 240
 241                 Host_Frame (framenewtime - frameoldtime);
 242
 243                 frameoldtime = framenewtime;
 244         }
 245         return 0;
 246 }