rockbox/apps/plugins/rockboy/emu.c

#include "rockmacros.h"
#include "defs.h"
#include "regs.h"
#include "hw.h"
#include "cpu-gb.h"
#include "mem.h"
#include "lcd-gb.h"
#include "rc.h"
#include "sound.h"
#include "rtc-gb.h"

static int framelen = 16743;
static int framecount;

rcvar_t emu_exports[] =
{
    RCV_INT("framelen", &framelen),
    RCV_INT("framecount", &framecount),
    RCV_END
};

void emu_init(void)
{
}

/*
 * emu_reset is called to initialize the state of the emulated
 * system. It should set cpu registers, hardware registers, etc. to
 * their appropriate values at powerup time.
 */

void emu_reset(void)
{
    hw_reset();
    lcd_reset();
    cpu_reset();
    mbc_reset();
    sound_reset();
}

void emu_step(void)
{
    cpu_emulate(cpu.lcdc);
}

/* This mess needs to be moved to another module; it's just here to
 * make things work in the mean time. */
void emu_run(void)
{
//	void *timer = sys_timer();
    int framesin=0,frames=0,timeten=*rb->current_tick, timehun=*rb->current_tick;
//	int delay;

    setvidmode(options.fullscreen);
    vid_begin();
    lcd_begin();
#ifdef HAVE_ADJUSTABLE_CPU_FREQ
    rb->cpu_boost(true);
#endif
    while(!shut)
    {
        cpu_emulate(2280);
        while (R_LY > 0 && R_LY < 144)
            emu_step();

        rtc_tick();
        sound_mix();
        if (!pcm_submit())
        {
/*          delay = framelen - sys_elapsed(timer);
            sys_sleep(delay);
            sys_elapsed(timer);*/
        }

        doevents();
        vid_begin();
		
        if (!(R_LCDC & 0x80))
            cpu_emulate(32832);
		
        while (R_LY > 0) /* wait for next frame */
            emu_step();
        rb->yield();

        frames++;
        framesin++;

        if(*rb->current_tick-timeten>=20)
        {
            timeten=*rb->current_tick;
            if(framesin<12) options.frameskip++;
            if(framesin>12) options.frameskip--;
            if(options.frameskip>options.maxskip) options.frameskip=options.maxskip;
            if(options.frameskip<0) options.frameskip=0;
            framesin=0;
        }

        if(options.showstats)
            if(*rb->current_tick-timehun>=100)
            {
                options.fps=frames;
                frames=0;
                timehun=*rb->current_tick;
            }
    }

#ifdef HAVE_ADJUSTABLE_CPU_FREQ
    rb->cpu_boost(false);
#endif
}