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 #ifdef HAVE_LCD_COLOR
  45     set_pal();
  46 #endif
  47
  48     while(!shut)
  49     {
  50         cpu_emulate(2280);
  51         while (R_LY > 0 && R_LY < 144)
  52             emu_step();
  53
  54         rtc_tick();
  55
  56         if (options.sound || !plugbuf)
  57                 {
  58             sound_mix();
  59             rockboy_pcm_submit();
  60                 }
  61
  62         doevents();
  63         vid_begin();
  64
  65         if (!(R_LCDC & 0x80))
  66             cpu_emulate(32832);
  67
  68         while (R_LY > 0) /* wait for next frame */
  69         {
  70             emu_step();
  71             rb->yield();
  72         }
  73
  74         frames++;
  75         framesin++;
  76
  77         if(*rb->current_tick-timeten>=10)
  78         {
  79             timeten=*rb->current_tick;
  80             if(framesin<6) options.frameskip++;
  81             if(framesin>6) options.frameskip--;
  82             if(options.frameskip>options.maxskip) options.frameskip=options.maxskip;
  83             if(options.frameskip<0) options.frameskip=0;
  84             framesin=0;
  85         }
  86
  87         if(options.showstats)
  88             if(*rb->current_tick-timehun>=100)
  89             {
  90                 options.fps=frames;
  91                 frames=0;
  92                 timehun=*rb->current_tick;
  93             }
  94     }
  95
  96 #ifdef HAVE_ADJUSTABLE_CPU_FREQ
  97     rb->cpu_boost(false);
  98 #endif
  99 }