apps/plugins/rockboy/emu.c

   1 #include "rockmacros.h"
   2 #include "defs.h"
   3 #include "regs.h"
   4 #include "hw.h"
   5 #include "cpu-gb.h"
   6 #include "mem.h"
   7 #include "lcd-gb.h"
   8 #include "sound.h"
   9 #include "rtc-gb.h"
  10 #include "pcm.h"
  11 #include "emu.h"
  12
  13 /*
  14  * emu_reset is called to initialize the state of the emulated
  15  * system. It should set cpu registers, hardware registers, etc. to
  16  * their appropriate values at powerup time.
  17  */
  18
  19 void emu_reset(void)
  20 {
  21     hw_reset();
  22     lcd_reset();
  23     cpu_reset();
  24     mbc_reset();
  25     sound_reset();
  26 }
  27
  28 static void emu_step(void)
  29 {
  30     cpu_emulate(cpu.lcdc);
  31 }
  32
  33 /* This mess needs to be moved to another module; it's just here to
  34  * make things work in the mean time. */
  35 void emu_run(void)
  36 {
  37     int framesin=0,frames=0,timeten=*rb->current_tick, timehun=*rb->current_tick;
  38
  39     setvidmode();
  40     vid_begin();
  41     lcd_begin();
  42 #ifdef HAVE_ADJUSTABLE_CPU_FREQ
  43     rb->cpu_boost(true);
  44 #endif
  45 #ifdef HAVE_LCD_COLOR
  46     set_pal();
  47 #endif
  48
  49     while(!shut)
  50     {
  51         cpu_emulate(2280);
  52         while (R_LY > 0 && R_LY < 144)
  53             emu_step();
  54
  55         rtc_tick();
  56
  57         if (options.sound || !plugbuf)
  58                 {
  59             sound_mix();
  60             rockboy_pcm_submit();
  61                 }
  62
  63         doevents();
  64         vid_begin();
  65
  66         if (!(R_LCDC & 0x80))
  67             cpu_emulate(32832);
  68
  69         while (R_LY > 0) /* wait for next frame */
  70         {
  71             emu_step();
  72             rb->yield();
  73         }
  74
  75         frames++;
  76         framesin++;
  77
  78         if(*rb->current_tick-timeten>=10)
  79         {
  80             timeten=*rb->current_tick;
  81             if(framesin<6) options.frameskip++;
  82             if(framesin>6) options.frameskip--;
  83             if(options.frameskip>options.maxskip) options.frameskip=options.maxskip;
  84             if(options.frameskip<0) options.frameskip=0;
  85             framesin=0;
  86         }
  87
  88         if(options.showstats)
  89             if(*rb->current_tick-timehun>=100)
  90             {
  91                 options.fps=frames;
  92                 frames=0;
  93                 timehun=*rb->current_tick;
  94             }
  95     }
  96
  97 #ifdef HAVE_ADJUSTABLE_CPU_FREQ
  98     rb->cpu_boost(false);
  99 #endif
 100 }