dsp3emu.c

linux下的任天堂模拟器代码。供大家参考。

	DSP3_SR = 0xC0;
}

void DSP3_Decode()
{
	DSP3_Codewords = DSP3_DR;
	SetDSP3 = &DSP3_Decode_A;
}


// Opcodes 1E/3E bit-perfect to 'dsp3-intro' log
// src: adapted from SD Gundam X/G-Next

int16 op3e_x;
int16 op3e_y;

int16 op1e_terrain[0x2000];
int16 op1e_cost[0x2000];
int16 op1e_weight[0x2000];

int16 op1e_cell;
int16 op1e_turn;
int16 op1e_search;

int16 op1e_x;
int16 op1e_y;

int16 op1e_min_radius;
int16 op1e_max_radius;

int16 op1e_max_search_radius;
int16 op1e_max_path_radius;

int16 op1e_lcv_radius;
int16 op1e_lcv_steps;
int16 op1e_lcv_turns;

void DSP3_OP3E()
{
	op3e_x = (uint8)(DSP3_DR & 0x00ff);
	op3e_y = (uint8)((DSP3_DR & 0xff00)>>8);

	DSP3_OP03();

	op1e_terrain[ DSP3_DR ] = 0x00;
	op1e_cost[ DSP3_DR ] = 0xff;
	op1e_weight[ DSP3_DR ] = 0;

	op1e_max_search_radius = 0;
	op1e_max_path_radius = 0;
}

void DSP3_OP1E_A();
void DSP3_OP1E_A1();
void DSP3_OP1E_A2();
void DSP3_OP1E_A3();

void DSP3_OP1E_B();
void DSP3_OP1E_B1();
void DSP3_OP1E_B2();

void DSP3_OP1E_C();
void DSP3_OP1E_C1();
void DSP3_OP1E_C2();

void DSP3_OP1E_D( int16, int16 *, int16 * );
void DSP3_OP1E_D1( int16 move, int16 *lo, int16 *hi );

void DSP3_OP1E()
{
	int lcv;

	op1e_min_radius = (uint8)(DSP3_DR & 0x00ff);
	op1e_max_radius = (uint8)((DSP3_DR & 0xff00)>>8);

	if( op1e_min_radius == 0 )
		op1e_min_radius++;

	if( op1e_max_search_radius >= op1e_min_radius )
		op1e_min_radius = op1e_max_search_radius+1;

	if( op1e_max_radius > op1e_max_search_radius )
		op1e_max_search_radius = op1e_max_radius;

	op1e_lcv_radius = op1e_min_radius;
	op1e_lcv_steps = op1e_min_radius;

	op1e_lcv_turns = 6;
	op1e_turn = 0;

	op1e_x = op3e_x;
	op1e_y = op3e_y;

	for( lcv = 0; lcv < op1e_min_radius; lcv++ )
		DSP3_OP1E_D( op1e_turn, &op1e_x, &op1e_y );

	DSP3_OP1E_A();
}

void DSP3_OP1E_A()
{
	int lcv;

	if( op1e_lcv_steps == 0 ) {
		op1e_lcv_radius++;

		op1e_lcv_steps = op1e_lcv_radius;

		op1e_x = op3e_x;
		op1e_y = op3e_y;

		for( lcv = 0; lcv < op1e_lcv_radius; lcv++ )
			DSP3_OP1E_D( op1e_turn, &op1e_x, &op1e_y );
	}

	if( op1e_lcv_radius > op1e_max_radius ) {
		op1e_turn++;
		op1e_lcv_turns--;

		op1e_lcv_radius = op1e_min_radius;
		op1e_lcv_steps = op1e_min_radius;

		op1e_x = op3e_x;
		op1e_y = op3e_y;

		for( lcv = 0; lcv < op1e_min_radius; lcv++ )
			DSP3_OP1E_D( op1e_turn, &op1e_x, &op1e_y );
	}

	if( op1e_lcv_turns == 0 ) {
		DSP3_DR = 0xffff;
		DSP3_SR = 0x0080;
		SetDSP3 = &DSP3_OP1E_B;
		return;
	}

	DSP3_DR = (uint8)(op1e_x) | ((uint8)(op1e_y)<<8);
	DSP3_OP03();

	op1e_cell = DSP3_DR;

	DSP3_SR = 0x0080;
	SetDSP3 = &DSP3_OP1E_A1;
}

void DSP3_OP1E_A1()
{
	DSP3_SR = 0x0084;
	SetDSP3 = &DSP3_OP1E_A2;
}

void DSP3_OP1E_A2()
{
	op1e_terrain[ op1e_cell ] = (uint8)(DSP3_DR & 0x00ff);

	DSP3_SR = 0x0084;
	SetDSP3 = &DSP3_OP1E_A3;
}

void DSP3_OP1E_A3()
{
	op1e_cost[ op1e_cell ] = (uint8)(DSP3_DR & 0x00ff);

	if( op1e_lcv_radius == 1 ) {
		if( op1e_terrain[ op1e_cell ] & 1 ) {
			op1e_weight[ op1e_cell ] = 0xff;
		} else {
			op1e_weight[ op1e_cell ] = op1e_cost[ op1e_cell ];
		}
	}
	else {
		op1e_weight[ op1e_cell ] = 0xff;
	}

	DSP3_OP1E_D( (int16)(op1e_turn+2), &op1e_x, &op1e_y );
	op1e_lcv_steps--;

	DSP3_SR = 0x0080;
	DSP3_OP1E_A();
}


void DSP3_OP1E_B()
{
	op1e_x = op3e_x;
	op1e_y = op3e_y;
	op1e_lcv_radius = 1;

	op1e_search = 0;

	DSP3_OP1E_B1();

	SetDSP3 = &DSP3_OP1E_C;
}


void DSP3_OP1E_B1()
{
	while( op1e_lcv_radius < op1e_max_radius ) {
		op1e_y--;

		op1e_lcv_turns = 6;
		op1e_turn = 5;

		while( op1e_lcv_turns ) {
			op1e_lcv_steps = op1e_lcv_radius;

			while( op1e_lcv_steps ) {
				DSP3_OP1E_D1( op1e_turn, &op1e_x, &op1e_y );

				if( 0 <= op1e_y && op1e_y < DSP3_WinHi &&
						0 <= op1e_x && op1e_x < DSP3_WinLo ) {
					DSP3_DR = (uint8)(op1e_x) | ((uint8)(op1e_y)<<8);
					DSP3_OP03();

					op1e_cell = DSP3_DR;
					if( op1e_cost[ op1e_cell ] < 0x80 &&
							op1e_terrain[ op1e_cell ] < 0x40 ) {
						DSP3_OP1E_B2();
					} // end cell perimeter
				}

				op1e_lcv_steps--;
			} // end search line

			op1e_turn--;
			if( op1e_turn == 0 ) op1e_turn = 6;

			op1e_lcv_turns--;
		} // end circle search

		op1e_lcv_radius++;
	} // end radius search
}


void DSP3_OP1E_B2()
{
	int16 cell;
	int16 path;
	int16 x,y;
	int16 lcv_turns;

	path = 0xff;
	lcv_turns = 6;

	while( lcv_turns ) {
		x = op1e_x;
		y = op1e_y;

		DSP3_OP1E_D1( lcv_turns, &x, &y );

		DSP3_DR = (uint8)(x) | ((uint8)(y)<<8);
		DSP3_OP03();

		cell = DSP3_DR;

		if( 0 <= y && y < DSP3_WinHi &&
				0 <= x && x < DSP3_WinLo  ) {

			if( op1e_terrain[ cell ] < 0x80 || op1e_weight[ cell ] == 0 ) {
				if( op1e_weight[ cell ] < path ) {
					path = op1e_weight[ cell ];
				}
			}
		} // end step travel

		lcv_turns--;
	} // end while turns

	if( path != 0xff ) {
		op1e_weight[ op1e_cell ] = path + op1e_cost[ op1e_cell ];
	}
}


void DSP3_OP1E_C()
{
	int lcv;

	op1e_min_radius = (uint8)(DSP3_DR & 0x00ff);
	op1e_max_radius = (uint8)((DSP3_DR & 0xff00)>>8);

	if( op1e_min_radius == 0 )
		op1e_min_radius++;

	if( op1e_max_path_radius >= op1e_min_radius )
		op1e_min_radius = op1e_max_path_radius+1;

	if( op1e_max_radius > op1e_max_path_radius )
		op1e_max_path_radius = op1e_max_radius;

	op1e_lcv_radius = op1e_min_radius;
	op1e_lcv_steps = op1e_min_radius;

	op1e_lcv_turns = 6;
	op1e_turn = 0;

	op1e_x = op3e_x;
	op1e_y = op3e_y;

	for( lcv = 0; lcv < op1e_min_radius; lcv++ )
		DSP3_OP1E_D( op1e_turn, &op1e_x, &op1e_y );

	DSP3_OP1E_C1();
}


void DSP3_OP1E_C1()
{
	int lcv;

	if( op1e_lcv_steps == 0 ) {
		op1e_lcv_radius++;

		op1e_lcv_steps = op1e_lcv_radius;

		op1e_x = op3e_x;
		op1e_y = op3e_y;

		for( lcv = 0; lcv < op1e_lcv_radius; lcv++ )
			DSP3_OP1E_D( op1e_turn, &op1e_x, &op1e_y );
	}

	if( op1e_lcv_radius > op1e_max_radius ) {
		op1e_turn++;
		op1e_lcv_turns--;

		op1e_lcv_radius = op1e_min_radius;
		op1e_lcv_steps = op1e_min_radius;

		op1e_x = op3e_x;
		op1e_y = op3e_y;

		for( lcv = 0; lcv < op1e_min_radius; lcv++ )
			DSP3_OP1E_D( op1e_turn, &op1e_x, &op1e_y );
	}

	if( op1e_lcv_turns == 0 ) {
		DSP3_DR = 0xffff;
		DSP3_SR = 0x0080;
		SetDSP3 = &DSP3_Reset;
		return;
	}

	DSP3_DR = (uint8)(op1e_x) | ((uint8)(op1e_y)<<8);
	DSP3_OP03();

	op1e_cell = DSP3_DR;

	DSP3_SR = 0x0080;
	SetDSP3 = &DSP3_OP1E_C2;
}


void DSP3_OP1E_C2()
{
	DSP3_DR = op1e_weight[ op1e_cell ];

	DSP3_OP1E_D( (int16)(op1e_turn+2), &op1e_x, &op1e_y );
	op1e_lcv_steps--;

	DSP3_SR = 0x0084;
	SetDSP3 = &DSP3_OP1E_C1;
}


void DSP3_OP1E_D( int16 move, int16 *lo, int16 *hi )
{
	uint32 dataOfs = ((move << 1) + 0x03b2) & 0x03ff;
	int16 Lo;
	int16 Hi;

	DSP3_AddHi = DSP3_DataROM[dataOfs];
	DSP3_AddLo = DSP3_DataROM[dataOfs + 1];

	Lo = (uint8)(*lo);
	Hi = (uint8)(*hi);

	if (Lo & 1)	Hi += (DSP3_AddLo & 1);

	DSP3_AddLo += Lo;
	DSP3_AddHi += Hi;

	if (DSP3_AddLo < 0)
		DSP3_AddLo += DSP3_WinLo;
	else
		if (DSP3_AddLo >= DSP3_WinLo)
			DSP3_AddLo -= DSP3_WinLo;

	if (DSP3_AddHi < 0)
		DSP3_AddHi += DSP3_WinHi;
	else
		if (DSP3_AddHi >= DSP3_WinHi)
			DSP3_AddHi -= DSP3_WinHi;

	*lo = DSP3_AddLo;
	*hi = DSP3_AddHi;
}


void DSP3_OP1E_D1( int16 move, int16 *lo, int16 *hi )
{
	//uint32 dataOfs = ((move << 1) + 0x03b2) & 0x03ff;
	int16 Lo;
	int16 Hi;

	const unsigned short HiAdd[] = {
		0x00, 0xFF, 0x00, 0x01, 0x01, 0x01, 0x00, 0x00,
		0x00, 0xFF, 0xFF, 0x00, 0x01, 0x00, 0xFF, 0x00
	};
	const unsigned short LoAdd[] = {
		0x00, 0x00, 0x01, 0x01, 0x00, 0xFF, 0xFF, 0x00
	};

	if( (*lo) & 1 )
		DSP3_AddHi = HiAdd[ move + 8 ];
	else
		DSP3_AddHi = HiAdd[ move + 0 ];
	DSP3_AddLo = LoAdd[ move ];

	Lo = (uint8)(*lo);
	Hi = (uint8)(*hi);

	if (Lo & 1)	Hi += (DSP3_AddLo & 1);

	DSP3_AddLo += Lo;
	DSP3_AddHi += Hi;

	*lo = DSP3_AddLo;
	*hi = DSP3_AddHi;
}


void DSP3_OP10()
{
	if( DSP3_DR == 0xffff ) {
		DSP3_Reset();
	} else {
		// absorb 2 bytes
		DSP3_DR = DSP3_DR;
	}
}


void DSP3_OP0C_A()
{
	// absorb 2 bytes

	DSP3_DR = 0;
	SetDSP3 = &DSP3_Reset;
}


void DSP3_OP0C()
{
	// absorb 2 bytes

	DSP3_DR = 0;
	//SetDSP3 = &DSP3_OP0C_A;
	SetDSP3 = &DSP3_Reset;
}


void DSP3_OP1C_C()
{
	// return 2 bytes
	DSP3_DR = 0;
	SetDSP3 = &DSP3_Reset;
}


void DSP3_OP1C_B()
{
	// absorb 2 bytes

	// return 2 bytes
	DSP3_DR = 0;
	SetDSP3 = &DSP3_OP1C_C;
}


void DSP3_OP1C_A()
{
	// absorb 2 bytes

	SetDSP3 = &DSP3_OP1C_B;
}


void DSP3_OP1C()
{
	// absorb 2 bytes

	SetDSP3 = &DSP3_OP1C_A;
}


void DSP3_Command()
{
	if (DSP3_DR < 0x40)
	{
		switch (DSP3_DR)
		{
    case 0x02: SetDSP3 = &DSP3_Coordinate; break;
    case 0x03: SetDSP3 = &DSP3_OP03; break;
    case 0x06: SetDSP3 = &DSP3_OP06; break;
    case 0x07: SetDSP3 = &DSP3_OP07; return;
    case 0x0c: SetDSP3 = &DSP3_OP0C; break;
    case 0x0f: SetDSP3 = &DSP3_TestMemory; break;
    case 0x10: SetDSP3 = &DSP3_OP10; break;
    case 0x18: SetDSP3 = &DSP3_Convert; break;
    case 0x1c: SetDSP3 = &DSP3_OP1C; break;
    case 0x1e: SetDSP3 = &DSP3_OP1E; break;
    case 0x1f: SetDSP3 = &DSP3_MemoryDump; break;
    case 0x38: SetDSP3 = &DSP3_Decode; break;
    case 0x3e: SetDSP3 = &DSP3_OP3E; break;
    default:
     return;
		}
		DSP3_SR = 0x0080;
		DSP3_Index = 0;
	}
}

uint8 dsp3_byte;
uint16 dsp3_address;

void DSP3SetByte()
{
  if (dsp3_address < 0xC000)
  {
		if (DSP3_SR & 0x04)
		{
			DSP3_DR = (DSP3_DR & 0xff00) + dsp3_byte;
			(*SetDSP3)();
		}
		else
		{
			DSP3_SR ^= 0x10;

			if (DSP3_SR & 0x10)
				DSP3_DR = (DSP3_DR & 0xff00) + dsp3_byte;
			else
			{
				DSP3_DR = (DSP3_DR & 0x00ff) + (dsp3_byte << 8);
				(*SetDSP3)();
			}
		}
  }
}

void DSP3GetByte()
{
  if (dsp3_address < 0xC000)
  {
		if (DSP3_SR & 0x04)
		{
			dsp3_byte = (uint8) DSP3_DR;
			(*SetDSP3)();
		}
		else
		{
			DSP3_SR ^= 0x10;

			if (DSP3_SR & 0x10)
				dsp3_byte = (uint8) (DSP3_DR);
			else
			{
				dsp3_byte = (uint8) (DSP3_DR >> 8);
				(*SetDSP3)();
			}
		}

  }
  else
  {
    dsp3_byte = (uint8) DSP3_SR;
  }
}

void InitDSP3()
{
  DSP3_Reset();
}