snes9xgx/source/snes9x/dsp3.cpp

/*****************************************************************************\
     Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
                This file is licensed under the Snes9x License.
   For further information, consult the LICENSE file in the root directory.
\*****************************************************************************/

#include "snes9x.h"
#include "memmap.h"

static void (*SetDSP3) (void);

static const uint16	DSP3_DataROM[1024] =
{
	0x8000, 0x4000, 0x2000, 0x1000, 0x0800, 0x0400, 0x0200, 0x0100,
	0x0080, 0x0040, 0x0020, 0x0010, 0x0008, 0x0004, 0x0002, 0x0001,
	0x0002, 0x0004, 0x0008, 0x0010, 0x0020, 0x0040, 0x0080, 0x0100,
	0x0000, 0x000f, 0x0400, 0x0200, 0x0140, 0x0400, 0x0200, 0x0040,
	0x007d, 0x007e, 0x007e, 0x007b, 0x007c, 0x007d, 0x007b, 0x007c,
	0x0002, 0x0020, 0x0030, 0x0000, 0x000d, 0x0019, 0x0026, 0x0032,
	0x003e, 0x004a, 0x0056, 0x0062, 0x006d, 0x0079, 0x0084, 0x008e,
	0x0098, 0x00a2, 0x00ac, 0x00b5, 0x00be, 0x00c6, 0x00ce, 0x00d5,
	0x00dc, 0x00e2, 0x00e7, 0x00ec, 0x00f1, 0x00f5, 0x00f8, 0x00fb,
	0x00fd, 0x00ff, 0x0100, 0x0100, 0x0100, 0x00ff, 0x00fd, 0x00fb,
	0x00f8, 0x00f5, 0x00f1, 0x00ed, 0x00e7, 0x00e2, 0x00dc, 0x00d5,
	0x00ce, 0x00c6, 0x00be, 0x00b5, 0x00ac, 0x00a2, 0x0099, 0x008e,
	0x0084, 0x0079, 0x006e, 0x0062, 0x0056, 0x004a, 0x003e, 0x0032,
	0x0026, 0x0019, 0x000d, 0x0000, 0xfff3, 0xffe7, 0xffdb, 0xffce,
	0xffc2, 0xffb6, 0xffaa, 0xff9e, 0xff93, 0xff87, 0xff7d, 0xff72,
	0xff68, 0xff5e, 0xff54, 0xff4b, 0xff42, 0xff3a, 0xff32, 0xff2b,
	0xff25, 0xff1e, 0xff19, 0xff14, 0xff0f, 0xff0b, 0xff08, 0xff05,
	0xff03, 0xff01, 0xff00, 0xff00, 0xff00, 0xff01, 0xff03, 0xff05,
	0xff08, 0xff0b, 0xff0f, 0xff13, 0xff18, 0xff1e, 0xff24, 0xff2b,
	0xff32, 0xff3a, 0xff42, 0xff4b, 0xff54, 0xff5d, 0xff67, 0xff72,
	0xff7c, 0xff87, 0xff92, 0xff9e, 0xffa9, 0xffb5, 0xffc2, 0xffce,
	0xffda, 0xffe7, 0xfff3, 0x002b, 0x007f, 0x0020, 0x00ff, 0xff00,
	0xffbe, 0x0000, 0x0044, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0xffc1, 0x0001, 0x0002, 0x0045,
	0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0xffc5, 0x0003, 0x0004, 0x0005, 0x0047, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0xffca, 0x0006, 0x0007, 0x0008,
	0x0009, 0x004a, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0xffd0, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x004e, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0xffd7, 0x000f, 0x0010, 0x0011,
	0x0012, 0x0013, 0x0014, 0x0053, 0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0xffdf, 0x0015, 0x0016, 0x0017, 0x0018, 0x0019, 0x001a, 0x001b,
	0x0059, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0xffe8, 0x001c, 0x001d, 0x001e,
	0x001f, 0x0020, 0x0021, 0x0022, 0x0023, 0x0060, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0xfff2, 0x0024, 0x0025, 0x0026, 0x0027, 0x0028, 0x0029, 0x002a,
	0x002b, 0x002c, 0x0068, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0xfffd, 0x002d, 0x002e, 0x002f,
	0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0071,
	0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0xffc7, 0x0037, 0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d,
	0x003e, 0x003f, 0x0040, 0x0041, 0x007b, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0xffd4, 0x0000, 0x0001, 0x0002,
	0x0003, 0x0004, 0x0005, 0x0006, 0x0007, 0x0008, 0x0009, 0x000a,
	0x000b, 0x0044, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0xffe2, 0x000c, 0x000d, 0x000e, 0x000f, 0x0010, 0x0011, 0x0012,
	0x0013, 0x0014, 0x0015, 0x0016, 0x0017, 0x0018, 0x0050, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0xfff1, 0x0019, 0x001a, 0x001b,
	0x001c, 0x001d, 0x001e, 0x001f, 0x0020, 0x0021, 0x0022, 0x0023,
	0x0024, 0x0025, 0x0026, 0x005d, 0x0000, 0x0000, 0x0000, 0x0000,
	0xffcb, 0x0027, 0x0028, 0x0029, 0x002a, 0x002b, 0x002c, 0x002d,
	0x002e, 0x002f, 0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035,
	0x006b, 0x0000, 0x0000, 0x0000, 0xffdc, 0x0000, 0x0001, 0x0002,
	0x0003, 0x0004, 0x0005, 0x0006, 0x0007, 0x0008, 0x0009, 0x000a,
	0x000b, 0x000c, 0x000d, 0x000e, 0x000f, 0x0044, 0x0000, 0x0000,
	0xffee, 0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016,
	0x0017, 0x0018, 0x0019, 0x001a, 0x001b, 0x001c, 0x001d, 0x001e,
	0x001f, 0x0020, 0x0054, 0x0000, 0xffee, 0x0021, 0x0022, 0x0023,
	0x0024, 0x0025, 0x0026, 0x0027, 0x0028, 0x0029, 0x002a, 0x002b,
	0x002c, 0x002d, 0x002e, 0x002f, 0x0030, 0x0031, 0x0032, 0x0065,
	0xffbe, 0x0000, 0xfeac, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0xffc1, 0x0001, 0x0002, 0xfead,
	0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0xffc5, 0x0003, 0x0004, 0x0005, 0xfeaf, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0xffca, 0x0006, 0x0007, 0x0008,
	0x0009, 0xfeb2, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0xffd0, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0xfeb6, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0xffd7, 0x000f, 0x0010, 0x0011,
	0x0012, 0x0013, 0x0014, 0xfebb, 0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0xffdf, 0x0015, 0x0016, 0x0017, 0x0018, 0x0019, 0x001a, 0x001b,
	0xfec1, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0xffe8, 0x001c, 0x001d, 0x001e,
	0x001f, 0x0020, 0x0021, 0x0022, 0x0023, 0xfec8, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0xfff2, 0x0024, 0x0025, 0x0026, 0x0027, 0x0028, 0x0029, 0x002a,
	0x002b, 0x002c, 0xfed0, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0xfffd, 0x002d, 0x002e, 0x002f,
	0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0xfed9,
	0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0xffc7, 0x0037, 0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d,
	0x003e, 0x003f, 0x0040, 0x0041, 0xfee3, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0xffd4, 0x0000, 0x0001, 0x0002,
	0x0003, 0x0004, 0x0005, 0x0006, 0x0007, 0x0008, 0x0009, 0x000a,
	0x000b, 0xfeac, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
	0xffe2, 0x000c, 0x000d, 0x000e, 0x000f, 0x0010, 0x0011, 0x0012,
	0x0013, 0x0014, 0x0015, 0x0016, 0x0017, 0x0018, 0xfeb8, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000, 0xfff1, 0x0019, 0x001a, 0x001b,
	0x001c, 0x001d, 0x001e, 0x001f, 0x0020, 0x0021, 0x0022, 0x0023,
	0x0024, 0x0025, 0x0026, 0xfec5, 0x0000, 0x0000, 0x0000, 0x0000,
	0xffcb, 0x0027, 0x0028, 0x0029, 0x002a, 0x002b, 0x002c, 0x002d,
	0x002e, 0x002f, 0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035,
	0xfed3, 0x0000, 0x0000, 0x0000, 0xffdc, 0x0000, 0x0001, 0x0002,
	0x0003, 0x0004, 0x0005, 0x0006, 0x0007, 0x0008, 0x0009, 0x000a,
	0x000b, 0x000c, 0x000d, 0x000e, 0x000f, 0xfeac, 0x0000, 0x0000,
	0xffee, 0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016,
	0x0017, 0x0018, 0x0019, 0x001a, 0x001b, 0x001c, 0x001d, 0x001e,
	0x001f, 0x0020, 0xfebc, 0x0000, 0xffee, 0x0021, 0x0022, 0x0023,
	0x0024, 0x0025, 0x0026, 0x0027, 0x0028, 0x0029, 0x002a, 0x002b,
	0x002c, 0x002d, 0x002e, 0x002f, 0x0030, 0x0031, 0x0032, 0xfecd,
	0x0154, 0x0218, 0x0110, 0x00b0, 0x00cc, 0x00b0, 0x0088, 0x00b0,
	0x0044, 0x00b0, 0x0000, 0x00b0, 0x00fe, 0xff07, 0x0002, 0x00ff,
	0x00f8, 0x0007, 0x00fe, 0x00ee, 0x07ff, 0x0200, 0x00ef, 0xf800,
	0x0700, 0x00ee, 0xffff, 0xffff, 0xffff, 0x0000, 0x0000, 0x0001,
	0x0001, 0x0001, 0x0001, 0x0000, 0x0000, 0xffff, 0xffff, 0xffff,
	0xffff, 0x0000, 0x0000, 0x0001, 0x0001, 0x0001, 0x0001, 0x0000,
	0x0000, 0xffff, 0xffff, 0x0000, 0xffff, 0x0001, 0x0000, 0x0001,
	0x0001, 0x0000, 0x0000, 0xffff, 0xffff, 0xffff, 0xffff, 0x0000,
	0xffff, 0x0001, 0x0000, 0x0001, 0x0001, 0x0000, 0x0000, 0xffff,
	0xffff, 0xffff, 0x0000, 0x0000, 0x0000, 0x0044, 0x0088, 0x00cc,
	0x0110, 0x0154, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
	0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
	0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
	0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
	0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
	0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff
};

static bool8 DSP3_GetBits (uint8);
//static void DSP3_MemorySize (void);
static void DSP3_TestMemory (void);
static void DSP3_DumpDataROM (void);
static void DSP3_MemoryDump (void);
static void DSP3_Coordinate (void);
static void DSP3_Command (void);
static void DSP3_Decode_Data (void);
static void DSP3_Decode_Tree (void);
static void DSP3_Decode_Symbols (void);
static void DSP3_Decode (void);
static void DSP3_Decode_A (void);
static void DSP3_Convert (void);
static void DSP3_Convert_A (void);
static void DSP3_OP03 (void);
static void DSP3_OP06 (void);
static void DSP3_OP07 (void);
static void DSP3_OP07_A (void);
static void DSP3_OP07_B (void);
static void DSP3_OP0C (void);
//static void DSP3_OP0C_A (void);
static void DSP3_OP10 (void);
static void DSP3_OP1C (void);
static void DSP3_OP1C_A (void);
static void DSP3_OP1C_B (void);
static void DSP3_OP1C_C (void);
static void DSP3_OP1E (void);
static void DSP3_OP1E_A (void);
static void DSP3_OP1E_A1 (void);
static void DSP3_OP1E_A2 (void);
static void DSP3_OP1E_A3 (void);
static void DSP3_OP1E_B (void);
static void DSP3_OP1E_B1 (void);
static void DSP3_OP1E_B2 (void);
static void DSP3_OP1E_C (void);
static void DSP3_OP1E_C1 (void);
static void DSP3_OP1E_C2 (void);
static void DSP3_OP1E_D (int16, int16 *, int16 *);
static void DSP3_OP1E_D1 (int16, int16 *, int16 *);
static void DSP3_OP3E (void);


void DSP3_Reset (void)
{
	DSP3.DR = 0x0080;
	DSP3.SR = 0x0084;
	SetDSP3 = &DSP3_Command;
}

/*
static void DSP3_MemorySize (void)
{
	DSP3.DR = 0x0300;
	SetDSP3 = &DSP3_Reset;
}
*/

static void DSP3_TestMemory (void)
{
	DSP3.DR = 0x0000;
	SetDSP3 = &DSP3_Reset;
}

static void DSP3_DumpDataROM (void)
{
	DSP3.DR = DSP3_DataROM[DSP3.MemoryIndex++];
	if (DSP3.MemoryIndex == 1024)
		SetDSP3 = &DSP3_Reset;
}

static void DSP3_MemoryDump (void)
{
	DSP3.MemoryIndex = 0;
	SetDSP3 = &DSP3_DumpDataROM;
	DSP3_DumpDataROM();
}

static void DSP3_OP06 (void)
{
	DSP3.WinLo = (uint8) (DSP3.DR);
	DSP3.WinHi = (uint8) (DSP3.DR >> 8);
	DSP3_Reset();
}

static void DSP3_OP03 (void)
{
	int16	Lo  = (uint8) (DSP3.DR);
	int16	Hi  = (uint8) (DSP3.DR >> 8);
	int16	Ofs = (DSP3.WinLo * Hi << 1) + (Lo << 1);

	DSP3.DR = Ofs >> 1;
	SetDSP3 = &DSP3_Reset;
}

static void DSP3_OP07_B (void)
{
	int16	Ofs = (DSP3.WinLo * DSP3.AddHi << 1) + (DSP3.AddLo << 1);

	DSP3.DR = Ofs >> 1;
	SetDSP3 = &DSP3_Reset;
}

static void DSP3_OP07_A (void)
{
	int16	Lo = (uint8) (DSP3.DR);
	int16	Hi = (uint8) (DSP3.DR >> 8);

	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;

	DSP3.DR = DSP3.AddLo | (DSP3.AddHi << 8) | ((DSP3.AddHi >> 8) & 0xff);
	SetDSP3 = &DSP3_OP07_B;
}

static void DSP3_OP07 (void)
{
	uint32	dataOfs = ((DSP3.DR << 1) + 0x03b2) & 0x03ff;

	DSP3.AddHi = DSP3_DataROM[dataOfs];
	DSP3.AddLo = DSP3_DataROM[dataOfs + 1];

	SetDSP3 = &DSP3_OP07_A;
	DSP3.SR = 0x0080;
}

static void DSP3_Coordinate (void)
{
	DSP3.Index++;

	switch (DSP3.Index)
	{
		case 3:
			if (DSP3.DR == 0xffff)
				DSP3_Reset();
			break;

		case 4:
			DSP3.X = DSP3.DR;
			break;

		case 5:
			DSP3.Y = DSP3.DR;
			DSP3.DR = 1;
			break;

		case 6:
			DSP3.DR = DSP3.X;
			break;

		case 7:
			DSP3.DR = DSP3.Y;
			DSP3.Index = 0;
			break;
	}
}

static void DSP3_Convert_A (void)
{
	if (DSP3.BMIndex < 8)
	{
		DSP3.Bitmap[DSP3.BMIndex++] = (uint8) (DSP3.DR);
		DSP3.Bitmap[DSP3.BMIndex++] = (uint8) (DSP3.DR >> 8);

		if (DSP3.BMIndex == 8)
		{
			for (int i = 0; i < 8; i++)
			{
				for (int j = 0; j < 8; j++)
				{
					DSP3.Bitplane[j] <<= 1;
					DSP3.Bitplane[j] |= (DSP3.Bitmap[i] >> j) & 1;
				}
			}

			DSP3.BPIndex = 0;
			DSP3.Count--;
		}
	}

	if (DSP3.BMIndex == 8)
	{
		if (DSP3.BPIndex == 8)
		{
			if (!DSP3.Count)
				DSP3_Reset();

			DSP3.BMIndex = 0;
		}
		else
		{
			DSP3.DR  = DSP3.Bitplane[DSP3.BPIndex++];
			DSP3.DR |= DSP3.Bitplane[DSP3.BPIndex++] << 8;
		}
	}
}

static void DSP3_Convert (void)
{
	DSP3.Count = DSP3.DR;
	DSP3.BMIndex = 0;
	SetDSP3 = &DSP3_Convert_A;
}

static bool8 DSP3_GetBits (uint8 Count)
{
	if (!DSP3.BitsLeft)
	{
		DSP3.BitsLeft = Count;
		DSP3.ReqBits = 0;
	}

	do
	{
		if (!DSP3.BitCount)
		{
			DSP3.SR = 0xC0;
			return (FALSE);
		}

		DSP3.ReqBits <<= 1;
		if (DSP3.ReqData & 0x8000)
			DSP3.ReqBits++;
		DSP3.ReqData <<= 1;

		DSP3.BitCount--;
		DSP3.BitsLeft--;

	}
	while (DSP3.BitsLeft);

	return (TRUE);
}

static void DSP3_Decode_Data (void)
{
	if (!DSP3.BitCount)
	{
		if (DSP3.SR & 0x40)
		{
			DSP3.ReqData = DSP3.DR;
			DSP3.BitCount += 16;
		}
		else
		{
			DSP3.SR = 0xC0;
			return;
		}
	}

	if (DSP3.LZCode == 1)
	{
		if (!DSP3_GetBits(1))
			return;

		if (DSP3.ReqBits)
			DSP3.LZLength = 12;
		else
			DSP3.LZLength = 8;

		DSP3.LZCode++;
	}

	if (DSP3.LZCode == 2)
	{
		if (!DSP3_GetBits(DSP3.LZLength))
			return;

		DSP3.LZCode = 0;
		DSP3.Outwords--;
		if (!DSP3.Outwords)
			SetDSP3 = &DSP3_Reset;

		DSP3.SR = 0x80;
		DSP3.DR = DSP3.ReqBits;
		return;
	}

	if (DSP3.BaseCode == 0xffff)
	{
		if (!DSP3_GetBits(DSP3.BaseLength))
			return;

		DSP3.BaseCode = DSP3.ReqBits;
	}

	if (!DSP3_GetBits(DSP3.CodeLengths[DSP3.BaseCode]))
		return;

	DSP3.Symbol = DSP3.Codes[DSP3.CodeOffsets[DSP3.BaseCode] + DSP3.ReqBits];
	DSP3.BaseCode = 0xffff;

	if (DSP3.Symbol & 0xff00)
	{
		DSP3.Symbol += 0x7f02;
		DSP3.LZCode++;
	}
	else
	{
		DSP3.Outwords--;
		if (!DSP3.Outwords)
			SetDSP3 = &DSP3_Reset;
	}

	DSP3.SR = 0x80;
	DSP3.DR = DSP3.Symbol;
}

static void DSP3_Decode_Tree (void)
{
	if (!DSP3.BitCount)
	{
		DSP3.ReqData = DSP3.DR;
		DSP3.BitCount += 16;
	}

	if (!DSP3.BaseCodes)
	{
		DSP3_GetBits(1);

		if (DSP3.ReqBits)
		{
			DSP3.BaseLength = 3;
			DSP3.BaseCodes = 8;
		}
		else
		{
			DSP3.BaseLength = 2;
			DSP3.BaseCodes = 4;
		}
	}

	while (DSP3.BaseCodes)
	{
		if (!DSP3_GetBits(3))
			return;

		DSP3.ReqBits++;

		DSP3.CodeLengths[DSP3.Index] = (uint8) DSP3.ReqBits;
		DSP3.CodeOffsets[DSP3.Index] = DSP3.Symbol;
		DSP3.Index++;

		DSP3.Symbol += 1 << DSP3.ReqBits;
		DSP3.BaseCodes--;
	}

	DSP3.BaseCode = 0xffff;
	DSP3.LZCode = 0;

	SetDSP3 = &DSP3_Decode_Data;
	if (DSP3.BitCount)
		DSP3_Decode_Data();
}

static void DSP3_Decode_Symbols (void)
{
	DSP3.ReqData = DSP3.DR;
	DSP3.BitCount += 16;

	do
	{
		if (DSP3.BitCommand == 0xffff)
		{
			if (!DSP3_GetBits(2))
				return;

			DSP3.BitCommand = DSP3.ReqBits;
		}

		switch (DSP3.BitCommand)
		{
			case 0:
				if (!DSP3_GetBits(9))
					return;
				DSP3.Symbol = DSP3.ReqBits;
				break;

			case 1:
				DSP3.Symbol++;
				break;

			case 2:
				if (!DSP3_GetBits(1))
					return;
				DSP3.Symbol += 2 + DSP3.ReqBits;
				break;

			case 3:
				if (!DSP3_GetBits(4))
					return;
				DSP3.Symbol += 4 + DSP3.ReqBits;
				break;
		}

		DSP3.BitCommand = 0xffff;

		DSP3.Codes[DSP3.Index++] = DSP3.Symbol;
		DSP3.Codewords--;

	}
	while (DSP3.Codewords);

	DSP3.Index = 0;
	DSP3.Symbol = 0;
	DSP3.BaseCodes = 0;

	SetDSP3 = &DSP3_Decode_Tree;
	if (DSP3.BitCount)
		DSP3_Decode_Tree();
}

static void DSP3_Decode_A (void)
{
	DSP3.Outwords = DSP3.DR;
	SetDSP3 = &DSP3_Decode_Symbols;
	DSP3.BitCount = 0;
	DSP3.BitsLeft = 0;
	DSP3.Symbol = 0;
	DSP3.Index = 0;
	DSP3.BitCommand = 0xffff;
	DSP3.SR = 0xC0;
}

static void DSP3_Decode (void)
{
	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

static void DSP3_OP3E (void)
{
	DSP3. op3e_x = (uint8)  (DSP3.DR & 0x00ff);
	DSP3. op3e_y = (uint8) ((DSP3.DR & 0xff00) >> 8);

	DSP3_OP03();

	DSP3.op1e_terrain[DSP3.DR] = 0x00;
	DSP3.op1e_cost[DSP3.DR]    = 0xff;
	DSP3.op1e_weight[DSP3.DR]  = 0;

	DSP3.op1e_max_search_radius = 0;
	DSP3.op1e_max_path_radius   = 0;
}

static void DSP3_OP1E (void)
{
	DSP3.op1e_min_radius = (uint8)  (DSP3.DR & 0x00ff);
	DSP3.op1e_max_radius = (uint8) ((DSP3.DR & 0xff00) >> 8);

	if (DSP3.op1e_min_radius == 0)
		DSP3.op1e_min_radius++;

	if (DSP3.op1e_max_search_radius >= DSP3.op1e_min_radius)
		DSP3.op1e_min_radius = DSP3.op1e_max_search_radius + 1;

	if (DSP3.op1e_max_radius > DSP3.op1e_max_search_radius)
		DSP3.op1e_max_search_radius = DSP3.op1e_max_radius;

	DSP3.op1e_lcv_radius = DSP3.op1e_min_radius;
	DSP3.op1e_lcv_steps = DSP3.op1e_min_radius;

	DSP3.op1e_lcv_turns = 6;
	DSP3.op1e_turn = 0;

	DSP3.op1e_x = DSP3. op3e_x;
	DSP3.op1e_y = DSP3. op3e_y;

	for (int lcv = 0; lcv < DSP3.op1e_min_radius; lcv++)
		DSP3_OP1E_D(DSP3.op1e_turn, &DSP3.op1e_x, &DSP3.op1e_y);

	DSP3_OP1E_A();
}

static void DSP3_OP1E_A (void)
{
	if (DSP3.op1e_lcv_steps == 0)
	{
		DSP3.op1e_lcv_radius++;

		DSP3.op1e_lcv_steps = DSP3.op1e_lcv_radius;

		DSP3.op1e_x = DSP3. op3e_x;
		DSP3.op1e_y = DSP3. op3e_y;

		for (int lcv = 0; lcv < DSP3.op1e_lcv_radius; lcv++)
			DSP3_OP1E_D(DSP3.op1e_turn, &DSP3.op1e_x, &DSP3.op1e_y);
	}

	if (DSP3.op1e_lcv_radius > DSP3.op1e_max_radius)
	{
		DSP3.op1e_turn++;
		DSP3.op1e_lcv_turns--;

		DSP3.op1e_lcv_radius = DSP3.op1e_min_radius;
		DSP3.op1e_lcv_steps = DSP3.op1e_min_radius;

		DSP3.op1e_x = DSP3. op3e_x;
		DSP3.op1e_y = DSP3. op3e_y;

		for (int lcv = 0; lcv < DSP3.op1e_min_radius; lcv++)
			DSP3_OP1E_D(DSP3.op1e_turn, &DSP3.op1e_x, &DSP3.op1e_y);
	}

	if (DSP3.op1e_lcv_turns == 0)
	{
		DSP3.DR = 0xffff;
		DSP3.SR = 0x0080;
		SetDSP3 = &DSP3_OP1E_B;
		return;
	}

	DSP3.DR = (uint8) (DSP3.op1e_x) | ((uint8) (DSP3.op1e_y) << 8);
	DSP3_OP03();

	DSP3.op1e_cell = DSP3.DR;

	DSP3.SR = 0x0080;
	SetDSP3 = &DSP3_OP1E_A1;
}

static void DSP3_OP1E_A1 (void)
{
	DSP3.SR = 0x0084;
	SetDSP3 = &DSP3_OP1E_A2;
}

static void DSP3_OP1E_A2 (void)
{
	DSP3.op1e_terrain[DSP3.op1e_cell] = (uint8) (DSP3.DR & 0x00ff);

	DSP3.SR = 0x0084;
	SetDSP3 = &DSP3_OP1E_A3;
}

static void DSP3_OP1E_A3 (void)
{
	DSP3.op1e_cost[DSP3.op1e_cell] = (uint8) (DSP3.DR & 0x00ff);

	if (DSP3.op1e_lcv_radius == 1)
	{
		if (DSP3.op1e_terrain[DSP3.op1e_cell] & 1)
			DSP3.op1e_weight[DSP3.op1e_cell] = 0xff;
		else
			DSP3.op1e_weight[DSP3.op1e_cell] = DSP3.op1e_cost[DSP3.op1e_cell];
	}
	else
		DSP3.op1e_weight[DSP3.op1e_cell] = 0xff;

	DSP3_OP1E_D((int16) (DSP3.op1e_turn + 2), &DSP3.op1e_x, &DSP3.op1e_y);
	DSP3.op1e_lcv_steps--;

	DSP3.SR = 0x0080;
	DSP3_OP1E_A();
}

static void DSP3_OP1E_B (void)
{
	DSP3.op1e_x = DSP3. op3e_x;
	DSP3.op1e_y = DSP3. op3e_y;
	DSP3.op1e_lcv_radius = 1;

	DSP3.op1e_search = 0;

	DSP3_OP1E_B1();

	SetDSP3 = &DSP3_OP1E_C;
}

static void DSP3_OP1E_B1 (void)
{
	while (DSP3.op1e_lcv_radius < DSP3.op1e_max_radius)
	{
		DSP3.op1e_y--;

		DSP3.op1e_lcv_turns = 6;
		DSP3.op1e_turn = 5;

		while (DSP3.op1e_lcv_turns)
		{
			DSP3.op1e_lcv_steps = DSP3.op1e_lcv_radius;

			while (DSP3.op1e_lcv_steps)
			{
				DSP3_OP1E_D1(DSP3.op1e_turn, &DSP3.op1e_x, &DSP3.op1e_y);

				if (0 <= DSP3.op1e_y && DSP3.op1e_y < DSP3.WinHi && 0 <= DSP3.op1e_x && DSP3.op1e_x < DSP3.WinLo)
				{
					DSP3.DR = (uint8) (DSP3.op1e_x) | ((uint8) (DSP3.op1e_y) << 8);
					DSP3_OP03();

					DSP3.op1e_cell = DSP3.DR;
					if (DSP3.op1e_cost[DSP3.op1e_cell] < 0x80 && DSP3.op1e_terrain[DSP3.op1e_cell] < 0x40)
						DSP3_OP1E_B2(); // end cell perimeter
				}

				DSP3.op1e_lcv_steps--;
			} // end search line

			DSP3.op1e_turn--;
			if (DSP3.op1e_turn == 0)
				DSP3.op1e_turn = 6;

			DSP3.op1e_lcv_turns--;
		} // end circle search

		DSP3.op1e_lcv_radius++;
	} // end radius search
}

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

	path = 0xff;
	lcv_turns = 6;

	while (lcv_turns)
	{
		x = DSP3.op1e_x;
		y = DSP3.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 (DSP3.op1e_terrain[cell] < 0x80 || DSP3.op1e_weight[cell] == 0)
			{
				if (DSP3.op1e_weight[cell] < path)
					path = DSP3.op1e_weight[cell];
			}
		} // end step travel

		lcv_turns--;
	} // end while turns

	if (path != 0xff)
		DSP3.op1e_weight[DSP3.op1e_cell] = path + DSP3.op1e_cost[DSP3.op1e_cell];
}

static void DSP3_OP1E_C (void)
{
	DSP3.op1e_min_radius = (uint8)  (DSP3.DR & 0x00ff);
	DSP3.op1e_max_radius = (uint8) ((DSP3.DR & 0xff00) >> 8);

	if (DSP3.op1e_min_radius == 0)
		DSP3.op1e_min_radius++;

	if (DSP3.op1e_max_path_radius >= DSP3.op1e_min_radius)
		DSP3.op1e_min_radius = DSP3.op1e_max_path_radius + 1;

	if (DSP3.op1e_max_radius > DSP3.op1e_max_path_radius)
		DSP3.op1e_max_path_radius = DSP3.op1e_max_radius;

	DSP3.op1e_lcv_radius = DSP3.op1e_min_radius;
	DSP3.op1e_lcv_steps = DSP3.op1e_min_radius;

	DSP3.op1e_lcv_turns = 6;
	DSP3.op1e_turn = 0;

	DSP3.op1e_x = DSP3. op3e_x;
	DSP3.op1e_y = DSP3. op3e_y;

	for (int lcv = 0; lcv < DSP3.op1e_min_radius; lcv++)
		DSP3_OP1E_D(DSP3.op1e_turn, &DSP3.op1e_x, &DSP3.op1e_y);

	DSP3_OP1E_C1();
}

static void DSP3_OP1E_C1 (void)
{
	if (DSP3.op1e_lcv_steps == 0)
	{
		DSP3.op1e_lcv_radius++;

		DSP3.op1e_lcv_steps = DSP3.op1e_lcv_radius;

		DSP3.op1e_x = DSP3. op3e_x;
		DSP3.op1e_y = DSP3. op3e_y;

		for (int lcv = 0; lcv < DSP3.op1e_lcv_radius; lcv++)
			DSP3_OP1E_D(DSP3.op1e_turn, &DSP3.op1e_x, &DSP3.op1e_y);
	}

	if (DSP3.op1e_lcv_radius > DSP3.op1e_max_radius)
	{
		DSP3.op1e_turn++;
		DSP3.op1e_lcv_turns--;

		DSP3.op1e_lcv_radius = DSP3.op1e_min_radius;
		DSP3.op1e_lcv_steps = DSP3.op1e_min_radius;

		DSP3.op1e_x = DSP3. op3e_x;
		DSP3.op1e_y = DSP3. op3e_y;

		for (int lcv = 0; lcv < DSP3.op1e_min_radius; lcv++)
			DSP3_OP1E_D(DSP3.op1e_turn, &DSP3.op1e_x, &DSP3.op1e_y);
	}

	if (DSP3.op1e_lcv_turns == 0)
	{
		DSP3.DR = 0xffff;
		DSP3.SR = 0x0080;
		SetDSP3 = &DSP3_Reset;
		return;
	}

	DSP3.DR = (uint8) (DSP3.op1e_x) | ((uint8) (DSP3.op1e_y) << 8);
	DSP3_OP03();

	DSP3.op1e_cell = DSP3.DR;

	DSP3.SR = 0x0080;
	SetDSP3 = &DSP3_OP1E_C2;
}

static void DSP3_OP1E_C2 (void)
{
	DSP3.DR = DSP3.op1e_weight[DSP3.op1e_cell];

	DSP3_OP1E_D((int16) (DSP3.op1e_turn + 2), &DSP3.op1e_x, &DSP3.op1e_y);
	DSP3.op1e_lcv_steps--;

	DSP3.SR = 0x0084;
	SetDSP3 = &DSP3_OP1E_C1;
}

static 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;
}

static void DSP3_OP1E_D1 (int16 move, int16 *lo, int16 *hi)
{
	static const uint16	HiAdd[] =
	{
		0x00, 0xFF, 0x00, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x01, 0x00, 0xFF, 0x00
	};

	static const uint16	LoAdd[] =
	{
		0x00, 0x00, 0x01, 0x01, 0x00, 0xFF, 0xFF, 0x00
	};

	int16	Lo;
	int16	Hi;

	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;
}

static void DSP3_OP10 (void)
{
	if (DSP3.DR == 0xffff)
		DSP3_Reset();
	else
		// absorb 2 bytes
		DSP3.DR = DSP3.DR; // FIXME?
}

/*
static void DSP3_OP0C_A (void)
{
	// absorb 2 bytes
	DSP3.DR = 0;
	SetDSP3 = &DSP3_Reset;
}
*/

static void DSP3_OP0C (void)
{
	// absorb 2 bytes
	DSP3.DR = 0;
	//SetDSP3 = &DSP3_OP0C_A;
	SetDSP3 = &DSP3_Reset;
}

static void DSP3_OP1C_C (void)
{
	// return 2 bytes
	DSP3.DR = 0;
	SetDSP3 = &DSP3_Reset;
}

static void DSP3_OP1C_B (void)
{
	// return 2 bytes
	DSP3.DR = 0;
	SetDSP3 = &DSP3_OP1C_C;
}

static void DSP3_OP1C_A (void)
{
	// absorb 2 bytes
	SetDSP3 = &DSP3_OP1C_B;
}

static void DSP3_OP1C (void)
{
	// absorb 2 bytes
	SetDSP3 = &DSP3_OP1C_A;
}

static void DSP3_Command (void)
{
	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;
	}
}

void DSP3SetByte (uint8 byte, uint16 address)
{
	if (address < DSP0.boundary)
	{
		if (DSP3.SR & 0x04)
		{
			DSP3.DR = (DSP3.DR & 0xff00) + byte;
			(*SetDSP3)();
		}
		else
		{
			DSP3.SR ^= 0x10;

			if (DSP3.SR & 0x10)
				DSP3.DR = (DSP3.DR & 0xff00) + byte;
			else
			{
				DSP3.DR = (DSP3.DR & 0x00ff) + (byte << 8);
				(*SetDSP3)();
			}
		}
	}
}

uint8 DSP3GetByte (uint16 address)
{
	if (address < DSP0.boundary)
	{
		uint8	byte;

		if (DSP3.SR & 0x04)
		{
			byte = (uint8) DSP3.DR;
			(*SetDSP3)();
		}
		else
		{
			DSP3.SR ^= 0x10;

			if (DSP3.SR & 0x10)
				byte = (uint8) (DSP3.DR);
			else
			{
				byte = (uint8) (DSP3.DR >> 8);
				(*SetDSP3)();
			}
		}

		return (byte);
	}

	return (uint8) DSP3.SR;
}