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