src/mainloop.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4
   5 #include "mainloop.h"
   6
   7 #include "video.h"
   8 #include "vm.h"
   9
  10
  11 ////////////////////////////////////////////////////////////////////////////////
  12 FrameCB frameCB = NULL;
  13 KeyCB keyCB = NULL;
  14 int vmPaused = 0;
  15
  16
  17 ////////////////////////////////////////////////////////////////////////////////
  18 static Uint32 cbFrameTimer (Uint32 interval, void *param) {
  19   SDL_Event evt;
  20   //
  21   evt.type = SDL_USEREVENT;
  22   /*
  23   //evt.user.type = SDL_USEREVENT;
  24   evt.user.code = 0;
  25   evt.user.data1 = NULL;
  26   evt.user.data2 = NULL;
  27   */
  28   SDL_PushEvent(&evt);
  29   //fprintf(stderr, "!\n");
  30   return interval;
  31 }
  32
  33
  34 // <0: quit; >0: new frame
  35 static int processEvents (void) {
  36   SDL_Event event;
  37   //
  38   while (SDL_WaitEvent(&event)) {
  39     switch (event.type) {
  40       case SDL_QUIT: // the user want to quit
  41         return -1;
  42       case SDL_KEYDOWN:
  43       case SDL_KEYUP:
  44         if (event.key.keysym.sym == SDLK_F12) return -1; // quit
  45         if (keyCB) keyCB(&event.key);
  46         break;
  47       case SDL_USEREVENT:
  48         //while (SDL_PollEvent(NULL)) processEvents();
  49         return 1;
  50       default: ;
  51     }
  52   }
  53   if (!vmIsThreadAlive(0)) return -1; // main thread is dead
  54   return 0;
  55 }
  56
  57
  58 static void buildFrame (void) {
  59   SurfaceLock lock;
  60   //
  61   lockSurface(&lock, screen);
  62   if (frameCB) frameCB(screen);
  63   unlockSurface(&lock);
  64   SDL_Flip(screen);
  65 }
  66
  67
  68 void mainLoop (void) {
  69   SDL_TimerID frameTimer = SDL_AddTimer(25, cbFrameTimer, NULL);
  70   int eres = 1;
  71   //
  72   while (eres >= 0) {
  73     if (eres > 0) {
  74       if (!vmPaused) vmExecuteAll();
  75       buildFrame();
  76     }
  77     eres = processEvents();
  78   }
  79   SDL_RemoveTimer(frameTimer);
  80 }