2203intf.c

十七种模拟器源代码 非常有用的作课程设计不可缺少的

#define NICK_BUBLBOBL_CHANGE

//#include "driver.h"
#include "sasound.h"
#include "ay8910.h"
#include "fm.h"

extern unsigned char No_FM;

static int stream[MAX_2203];

//static double syncTime[MAX_2203];

static const struct YM2203interface *intf;

static void *Timer[MAX_2203][2];
static void (*timer_callback)(int param);

/* IRQ Handler */
static void IRQHandler(int n,int irq)
{
  if(intf->handler[n]) intf->handler[n](irq);
}

#ifndef __RAINE__
/* TimerHandler from fm.c */
static void TimerHandler(int n,int c,int count,double stepTime)
{
	if( count == 0 )
	{	/* Reset FM Timer */
		if( Timer[n][c] )
		{
	 		timer_remove (Timer[n][c]);
			Timer[n][c] = 0;
		}
	}
	else
	{	/* Start FM Timer */
		if( Timer[n][c] == 0 )
		{
			double timeNow;
			double timeSec;
			/* Syncronus Start Timming */
			timeSec = ( (double)count * stepTime );
			timeNow = timer_get_time();
			if (syncTime[n] < timeNow)
			{
				syncTime[n] =  timeNow + (stepTime-fmod(timeNow-syncTime[n],stepTime));
			}
			Timer[n][c] = timer_set (timeSec+(syncTime[n]-timeNow), (c<<7)|n, timer_callback );
		}
	}
}
#endif

static void FMTimerInit( void )
{
	int i;

	for( i = 0 ; i < MAX_2203 ; i++ )
		Timer[i][0] = Timer[i][1] = 0;
}



/*------------------------- TM2203 -------------------------------*/
/* Timer overflow callback from timer.c */
static void timer_callback_2203(int param)
{
	int n=param&0x7f;
	int c=param>>7;

	Timer[n][c] = 0;
	YM2203TimerOver(n,c);
}
/* update request from fm.c */
void YM2203UpdateRequest(int chip)
{
	stream_update(stream[chip],0);
}

#if 0
/* update callback from stream.c */
static void YM2203UpdateCallback(int chip,void *buffer,int length)
{
	YM2203UpdateOne(chip,buffer,length);
}
#endif

int YM2203_sh_start(const struct YM2203interface *interface)
{
	int i;
	//int rate = Machine->sample_rate;
	int rate = audio_sample_rate;

	if( AY8910_sh_start_ex( interface,"YM2203") ) return 1;

	intf = interface;

	/* Timer Handler set */
	timer_callback = timer_callback_2203;
	FMTimerInit();
	/* stream system initialize */
	for (i = 0;i < intf->num;i++)
	{
		int volume;
		char name[20];
		sprintf(name,"YM2203 #%d FM",i);
		stream[i] = stream_init(name,rate,16,i,YM2203UpdateOne/*YM2203UpdateCallback*/);
		/* volume setup */
		volume = intf->mixing_level[i]>>16; /* high 16 bit */
		if( volume > 255 ) volume = 255;
		stream_set_volume(stream[i],volume);
	}
	/* Initialize FM emurator */
	//if (YM2203Init(intf->num,intf->baseclock,Machine->sample_rate,Machine->sample_bits,TimerHandler,0) == 0)
	if (YM2203Init(intf->num,intf->baseclock,rate,NULL,IRQHandler) == 0)
	{
		/* Ready */
		return 0;
	}
	/* error */
	/* stream close */
	//AY8910_sh_stop();
	return 1;
}

void YM2203_sh_stop(void)
{
	//AY8910_sh_stop();
	YM2203Shutdown();
}

//static int lastreg0,lastreg1;

int YM2203_status_port_0_r(int offset)
{
   static int ta;
   if(RaineSoundCard>0){
     return YM2203Read(0,0);
   }
   else{
      ta^=255;
      return ta;
   }
}
int YM2203_status_port_1_r(int offset)
{
   static int ta;
   if(RaineSoundCard>0){
      return YM2203Read(1,0);
   }
   else{
      ta^=255;
      return ta;
   }
}

int YM2203_read_port_0_r(int offset)
{
   static int ta;
   if(RaineSoundCard>0){
      return YM2203Read(0,1);
   }
   else{
      ta^=255;
      return ta;
   }
}
int YM2203_read_port_1_r(int offset)
{
   static int ta;
   if(RaineSoundCard>0){
      return YM2203Read(1,1);
   }
   else{
      ta^=255;
      return ta;
   }
}

void YM2203_control_port_0_w(int offset,int data)
{
   if(RaineSoundCard>0){
	YM2203Write(0,0,(UINT8)(data&0xFF));
   }
}
void YM2203_control_port_1_w(int offset,int data)
{
   if(RaineSoundCard>0){
	YM2203Write(1,0,(UINT8)(data&0xFF));
   }
}

void YM2203_write_port_0_w(int offset,int data)
{
   if(RaineSoundCard>0){
	YM2203Write(0,1,(UINT8)(data&0xFF));
   }
}
void YM2203_write_port_1_w(int offset,int data)
{
   if(RaineSoundCard>0){
	YM2203Write(1,1,(UINT8)(data&0xFF));
   }
}

void YM2203_sh_update(void)
{
}

int YM2203_get_stream_num( int num ){
  return stream[num];
}