c4emu.cpp

/***********************************************************************************
  Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.

  (c) Copyright 1996 - 2002  Gary Henderson ([email protected]),
                             Jerremy Koot ([email protected])

  (c) Copyright 2002 - 2004  Matthew Kendora

  (c) Copyright 2002 - 2005  Peter Bortas ([email protected])

  (c) Copyright 2004 - 2005  Joel Yliluoma (http://iki.fi/bisqwit/)

  (c) Copyright 2001 - 2006  John Weidman ([email protected])

  (c) Copyright 2002 - 2006  funkyass ([email protected]),
                             Kris Bleakley ([email protected])

  (c) Copyright 2002 - 2010  Brad Jorsch ([email protected]),
                             Nach ([email protected]),

  (c) Copyright 2002 - 2011  zones ([email protected])

  (c) Copyright 2006 - 2007  nitsuja

  (c) Copyright 2009 - 2011  BearOso,
                             OV2


  BS-X C emulator code
  (c) Copyright 2005 - 2006  Dreamer Nom,
                             zones

  C4 x86 assembler and some C emulation code
  (c) Copyright 2000 - 2003  _Demo_ ([email protected]),
                             Nach,
                             zsKnight ([email protected])

  C4 C++ code
  (c) Copyright 2003 - 2006  Brad Jorsch,
                             Nach

  DSP-1 emulator code
  (c) Copyright 1998 - 2006  _Demo_,
                             Andreas Naive ([email protected]),
                             Gary Henderson,
                             Ivar ([email protected]),
                             John Weidman,
                             Kris Bleakley,
                             Matthew Kendora,
                             Nach,
                             neviksti ([email protected])

  DSP-2 emulator code
  (c) Copyright 2003         John Weidman,
                             Kris Bleakley,
                             Lord Nightmare ([email protected]),
                             Matthew Kendora,
                             neviksti

  DSP-3 emulator code
  (c) Copyright 2003 - 2006  John Weidman,
                             Kris Bleakley,
                             Lancer,
                             z80 gaiden

  DSP-4 emulator code
  (c) Copyright 2004 - 2006  Dreamer Nom,
                             John Weidman,
                             Kris Bleakley,
                             Nach,
                             z80 gaiden

  OBC1 emulator code
  (c) Copyright 2001 - 2004  zsKnight,
                             pagefault ([email protected]),
                             Kris Bleakley
                             Ported from x86 assembler to C by sanmaiwashi

  SPC7110 and RTC C++ emulator code used in 1.39-1.51
  (c) Copyright 2002         Matthew Kendora with research by
                             zsKnight,
                             John Weidman,
                             Dark Force

  SPC7110 and RTC C++ emulator code used in 1.52+
  (c) Copyright 2009         byuu,
                             neviksti

  S-DD1 C emulator code
  (c) Copyright 2003         Brad Jorsch with research by
                             Andreas Naive,
                             John Weidman

  S-RTC C emulator code
  (c) Copyright 2001 - 2006  byuu,
                             John Weidman

  ST010 C++ emulator code
  (c) Copyright 2003         Feather,
                             John Weidman,
                             Kris Bleakley,
                             Matthew Kendora

  Super FX x86 assembler emulator code
  (c) Copyright 1998 - 2003  _Demo_,
                             pagefault,
                             zsKnight

  Super FX C emulator code
  (c) Copyright 1997 - 1999  Ivar,
                             Gary Henderson,
                             John Weidman

  Sound emulator code used in 1.5-1.51
  (c) Copyright 1998 - 2003  Brad Martin
  (c) Copyright 1998 - 2006  Charles Bilyue'

  Sound emulator code used in 1.52+
  (c) Copyright 2004 - 2007  Shay Green ([email protected])

  SH assembler code partly based on x86 assembler code
  (c) Copyright 2002 - 2004  Marcus Comstedt ([email protected])

  2xSaI filter
  (c) Copyright 1999 - 2001  Derek Liauw Kie Fa

  HQ2x, HQ3x, HQ4x filters
  (c) Copyright 2003         Maxim Stepin ([email protected])

  NTSC filter
  (c) Copyright 2006 - 2007  Shay Green

  GTK+ GUI code
  (c) Copyright 2004 - 2011  BearOso

  Win32 GUI code
  (c) Copyright 2003 - 2006  blip,
                             funkyass,
                             Matthew Kendora,
                             Nach,
                             nitsuja
  (c) Copyright 2009 - 2011  OV2

  Mac OS GUI code
  (c) Copyright 1998 - 2001  John Stiles
  (c) Copyright 2001 - 2011  zones


  Specific ports contains the works of other authors. See headers in
  individual files.


  Snes9x homepage: http://www.snes9x.com/

  Permission to use, copy, modify and/or distribute Snes9x in both binary
  and source form, for non-commercial purposes, is hereby granted without
  fee, providing that this license information and copyright notice appear
  with all copies and any derived work.

  This software is provided 'as-is', without any express or implied
  warranty. In no event shall the authors be held liable for any damages
  arising from the use of this software or it's derivatives.

  Snes9x is freeware for PERSONAL USE only. Commercial users should
  seek permission of the copyright holders first. Commercial use includes,
  but is not limited to, charging money for Snes9x or software derived from
  Snes9x, including Snes9x or derivatives in commercial game bundles, and/or
  using Snes9x as a promotion for your commercial product.

  The copyright holders request that bug fixes and improvements to the code
  should be forwarded to them so everyone can benefit from the modifications
  in future versions.

  Super NES and Super Nintendo Entertainment System are trademarks of
  Nintendo Co., Limited and its subsidiary companies.
 ***********************************************************************************/


#include <math.h>
#include "snes9x.h"
#include "memmap.h"
#include "sar.h"

static int16	C4SinTable[512] =
{
	     0,    402,    804,   1206,   1607,   2009,   2410,   2811,
	  3211,   3611,   4011,   4409,   4808,   5205,   5602,   5997,
	  6392,   6786,   7179,   7571,   7961,   8351,   8739,   9126,
	  9512,   9896,  10278,  10659,  11039,  11416,  11793,  12167,
	 12539,  12910,  13278,  13645,  14010,  14372,  14732,  15090,
	 15446,  15800,  16151,  16499,  16846,  17189,  17530,  17869,
	 18204,  18537,  18868,  19195,  19519,  19841,  20159,  20475,
	 20787,  21097,  21403,  21706,  22005,  22301,  22594,  22884,
	 23170,  23453,  23732,  24007,  24279,  24547,  24812,  25073,
	 25330,  25583,  25832,  26077,  26319,  26557,  26790,  27020,
	 27245,  27466,  27684,  27897,  28106,  28310,  28511,  28707,
	 28898,  29086,  29269,  29447,  29621,  29791,  29956,  30117,
	 30273,  30425,  30572,  30714,  30852,  30985,  31114,  31237,
	 31357,  31471,  31581,  31685,  31785,  31881,  31971,  32057,
	 32138,  32214,  32285,  32351,  32413,  32469,  32521,  32568,
	 32610,  32647,  32679,  32706,  32728,  32745,  32758,  32765,
	 32767,  32765,  32758,  32745,  32728,  32706,  32679,  32647,
	 32610,  32568,  32521,  32469,  32413,  32351,  32285,  32214,
	 32138,  32057,  31971,  31881,  31785,  31685,  31581,  31471,
	 31357,  31237,  31114,  30985,  30852,  30714,  30572,  30425,
	 30273,  30117,  29956,  29791,  29621,  29447,  29269,  29086,
	 28898,  28707,  28511,  28310,  28106,  27897,  27684,  27466,
	 27245,  27020,  26790,  26557,  26319,  26077,  25832,  25583,
	 25330,  25073,  24812,  24547,  24279,  24007,  23732,  23453,
	 23170,  22884,  22594,  22301,  22005,  21706,  21403,  21097,
	 20787,  20475,  20159,  19841,  19519,  19195,  18868,  18537,
	 18204,  17869,  17530,  17189,  16846,  16499,  16151,  15800,
	 15446,  15090,  14732,  14372,  14010,  13645,  13278,  12910,
	 12539,  12167,  11793,  11416,  11039,  10659,  10278,   9896,
	  9512,   9126,   8739,   8351,   7961,   7571,   7179,   6786,
	  6392,   5997,   5602,   5205,   4808,   4409,   4011,   3611,
	  3211,   2811,   2410,   2009,   1607,   1206,    804,    402,
	     0,   -402,   -804,  -1206,  -1607,  -2009,  -2410,  -2811,
	 -3211,  -3611,  -4011,  -4409,  -4808,  -5205,  -5602,  -5997,
	 -6392,  -6786,  -7179,  -7571,  -7961,  -8351,  -8739,  -9126,
	 -9512,  -9896, -10278, -10659, -11039, -11416, -11793, -12167,
	-12539, -12910, -13278, -13645, -14010, -14372, -14732, -15090,
	-15446, -15800, -16151, -16499, -16846, -17189, -17530, -17869,
	-18204, -18537, -18868, -19195, -19519, -19841, -20159, -20475,
	-20787, -21097, -21403, -21706, -22005, -22301, -22594, -22884,
	-23170, -23453, -23732, -24007, -24279, -24547, -24812, -25073,
	-25330, -25583, -25832, -26077, -26319, -26557, -26790, -27020,
	-27245, -27466, -27684, -27897, -28106, -28310, -28511, -28707,
	-28898, -29086, -29269, -29447, -29621, -29791, -29956, -30117,
	-30273, -30425, -30572, -30714, -30852, -30985, -31114, -31237,
	-31357, -31471, -31581, -31685, -31785, -31881, -31971, -32057,
	-32138, -32214, -32285, -32351, -32413, -32469, -32521, -32568,
	-32610, -32647, -32679, -32706, -32728, -32745, -32758, -32765,
	-32767, -32765, -32758, -32745, -32728, -32706, -32679, -32647,
	-32610, -32568, -32521, -32469, -32413, -32351, -32285, -32214,
	-32138, -32057, -31971, -31881, -31785, -31685, -31581, -31471,
	-31357, -31237, -31114, -30985, -30852, -30714, -30572, -30425,
	-30273, -30117, -29956, -29791, -29621, -29447, -29269, -29086,
	-28898, -28707, -28511, -28310, -28106, -27897, -27684, -27466,
	-27245, -27020, -26790, -26557, -26319, -26077, -25832, -25583,
	-25330, -25073, -24812, -24547, -24279, -24007, -23732, -23453,
	-23170, -22884, -22594, -22301, -22005, -21706, -21403, -21097,
	-20787, -20475, -20159, -19841, -19519, -19195, -18868, -18537,
	-18204, -17869, -17530, -17189, -16846, -16499, -16151, -15800,
	-15446, -15090, -14732, -14372, -14010, -13645, -13278, -12910,
	-12539, -12167, -11793, -11416, -11039, -10659, -10278,  -9896,
	 -9512,  -9126,  -8739,  -8351,  -7961,  -7571,  -7179,  -6786,
	 -6392,  -5997,  -5602,  -5205,  -4808,  -4409,  -4011,  -3611,
	 -3211,  -2811,  -2410,  -2009,  -1607,  -1206,   -804,   -402
};

static int16	C4CosTable[512] =
{
	 32767,  32765,  32758,  32745,  32728,  32706,  32679,  32647,
	 32610,  32568,  32521,  32469,  32413,  32351,  32285,  32214,
	 32138,  32057,  31971,  31881,  31785,  31685,  31581,  31471,
	 31357,  31237,  31114,  30985,  30852,  30714,  30572,  30425,
	 30273,  30117,  29956,  29791,  29621,  29447,  29269,  29086,
	 28898,  28707,  28511,  28310,  28106,  27897,  27684,  27466,
	 27245,  27020,  26790,  26557,  26319,  26077,  25832,  25583,
	 25330,  25073,  24812,  24547,  24279,  24007,  23732,  23453,
	 23170,  22884,  22594,  22301,  22005,  21706,  21403,  21097,
	 20787,  20475,  20159,  19841,  19519,  19195,  18868,  18537,
	 18204,  17869,  17530,  17189,  16846,  16499,  16151,  15800,
	 15446,  15090,  14732,  14372,  14010,  13645,  13278,  12910,
	 12539,  12167,  11793,  11416,  11039,  10659,  10278,   9896,
	  9512,   9126,   8739,   8351,   7961,   7571,   7179,   6786,
	  6392,   5997,   5602,   5205,   4808,   4409,   4011,   3611,
	  3211,   2811,   2410,   2009,   1607,   1206,    804,    402,
	     0,   -402,   -804,  -1206,  -1607,  -2009,  -2410,  -2811,
	 -3211,  -3611,  -4011,  -4409,  -4808,  -5205,  -5602,  -5997,
	 -6392,  -6786,  -7179,  -7571,  -7961,  -8351,  -8739,  -9126,
	 -9512,  -9896, -10278, -10659, -11039, -11416, -11793, -12167,
	-12539, -12910, -13278, -13645, -14010, -14372, -14732, -15090,
	-15446, -15800, -16151, -16499, -16846, -17189, -17530, -17869,
	-18204, -18537, -18868, -19195, -19519, -19841, -20159, -20475,
	-20787, -21097, -21403, -21706, -22005, -22301, -22594, -22884,
	-23170, -23453, -23732, -24007, -24279, -24547, -24812, -25073,
	-25330, -25583, -25832, -26077, -26319, -26557, -26790, -27020,
	-27245, -27466, -27684, -27897, -28106, -28310, -28511, -28707,
	-28898, -29086, -29269, -29447, -29621, -29791, -29956, -30117,
	-30273, -30425, -30572, -30714, -30852, -30985, -31114, -31237,
	-31357, -31471, -31581, -31685, -31785, -31881, -31971, -32057,
	-32138, -32214, -32285, -32351, -32413, -32469, -32521, -32568,
	-32610, -32647, -32679, -32706, -32728, -32745, -32758, -32765,
	-32767, -32765, -32758, -32745, -32728, -32706, -32679, -32647,
	-32610, -32568, -32521, -32469, -32413, -32351, -32285, -32214,
	-32138, -32057, -31971, -31881, -31785, -31685, -31581, -31471,
	-31357, -31237, -31114, -30985, -30852, -30714, -30572, -30425,
	-30273, -30117, -29956, -29791, -29621, -29447, -29269, -29086,
	-28898, -28707, -28511, -28310, -28106, -27897, -27684, -27466,
	-27245, -27020, -26790, -26557, -26319, -26077, -25832, -25583,
	-25330, -25073, -24812, -24547, -24279, -24007, -23732, -23453,
	-23170, -22884, -22594, -22301, -22005, -21706, -21403, -21097,
	-20787, -20475, -20159, -19841, -19519, -19195, -18868, -18537,
	-18204, -17869, -17530, -17189, -16846, -16499, -16151, -15800,
	-15446, -15090, -14732, -14372, -14010, -13645, -13278, -12910,
	-12539, -12167, -11793, -11416, -11039, -10659, -10278,  -9896,
	 -9512,  -9126,  -8739,  -8351,  -7961,  -7571,  -7179,  -6786,
	 -6392,  -5997,  -5602,  -5205,  -4808,  -4409,  -4011,  -3611,
	 -3211,  -2811,  -2410,  -2009,  -1607,  -1206,   -804,   -402,
	     0,    402,    804,   1206,   1607,   2009,   2410,   2811,
	  3211,   3611,   4011,   4409,   4808,   5205,   5602,   5997,
	  6392,   6786,   7179,   7571,   7961,   8351,   8739,   9126,
	  9512,   9896,  10278,  10659,  11039,  11416,  11793,  12167,
	 12539,  12910,  13278,  13645,  14010,  14372,  14732,  15090,
	 15446,  15800,  16151,  16499,  16846,  17189,  17530,  17869,
	 18204,  18537,  18868,  19195,  19519,  19841,  20159,  20475,
	 20787,  21097,  21403,  21706,  22005,  22301,  22594,  22884,
	 23170,  23453,  23732,  24007,  24279,  24547,  24812,  25073,
	 25330,  25583,  25832,  26077,  26319,  26557,  26790,  27020,
	 27245,  27466,  27684,  27897,  28106,  28310,  28511,  28707,
	 28898,  29086,  29269,  29447,  29621,  29791,  29956,  30117,
	 30273,  30425,  30572,  30714,  30852,  30985,  31114,  31237,
	 31357,  31471,  31581,  31685,  31785,  31881,  31971,  32057,
	 32138,  32214,  32285,  32351,  32413,  32469,  32521,  32568,
	 32610,  32647,  32679,  32706,  32728,  32745,  32758,  32765
};

static uint8	C4TestPattern[12 * 4] =
{
	0x00, 0x00, 0x00, 0xff,
	0xff, 0xff, 0x00, 0xff,
	0x00, 0x00, 0x00, 0xff,
	0xff, 0xff, 0x00, 0x00,
	0xff, 0xff, 0x00, 0x00,
	0x80, 0xff, 0xff, 0x7f,
	0x00, 0x80, 0x00, 0xff,
	0x7f, 0x00, 0xff, 0x7f,
	0xff, 0x7f, 0xff, 0xff,
	0x00, 0x00, 0x01, 0xff,
	0xff, 0xfe, 0x00, 0x01,
	0x00, 0xff, 0xfe, 0x00
};

static void C4ConvOAM (void);
static void C4DoScaleRotate (int);
static void C4DrawLine (int32, int32, int16, int32, int32, int16, uint8);
static void C4DrawWireFrame (void);
static void C4TransformLines (void);
static void C4BitPlaneWave (void);
static void C4SprDisintegrate (void);
static void C4ProcessSprites (void);


static void C4ConvOAM (void)
{
	uint8	*OAMptr = Memory.C4RAM + (Memory.C4RAM[0x626] << 2);
	for (uint8 *i = Memory.C4RAM + 0x1fd; i > OAMptr; i -= 4)
		*i = 0xe0; // Clear OAM-to-be

	uint8	*OAMptr2;
	uint16	globalX, globalY;
	int16	SprX, SprY;
	uint8	SprName, SprAttr;
	uint8	SprCount;

	globalX = READ_WORD(Memory.C4RAM + 0x0621);
	globalY = READ_WORD(Memory.C4RAM + 0x0623);
	OAMptr2 = Memory.C4RAM + 0x200 + (Memory.C4RAM[0x626] >> 2);

#ifdef DEBUGGER
	if (Memory.C4RAM[0x625] != 0)
		printf("$6625=%02x, expected 00\n", Memory.C4RAM[0x625]);
	if ((Memory.C4RAM[0x626] >> 2) != Memory.C4RAM[0x629])
		printf("$6629=%02x, expected %02x\n", Memory.C4RAM[0x629], (Memory.C4RAM[0x626] >> 2));
	if (((uint16) Memory.C4RAM[0x626] << 2) != READ_WORD(Memory.C4RAM + 0x627))
		printf("$6627=%04x, expected %04x\n", READ_WORD(Memory.C4RAM + 0x627), ((uint16) Memory.C4RAM[0x626] << 2));
#endif

	if (Memory.C4RAM[0x0620] != 0)
	{
		SprCount = 128 - Memory.C4RAM[0x626];

		uint8	offset = (Memory.C4RAM[0x626] & 3) * 2;
		uint8	*srcptr = Memory.C4RAM + 0x220;

		for (int i = Memory.C4RAM[0x0620]; i > 0 && SprCount > 0; i--, srcptr += 16)
		{
			SprX = READ_WORD(srcptr)     - globalX;
			SprY = READ_WORD(srcptr + 2) - globalY;
			SprName = srcptr[5];
			SprAttr = srcptr[4] | srcptr[0x06]; // XXX: mask bits?

			uint8	*sprptr = C4GetMemPointer(READ_3WORD(srcptr + 7));
			if (*sprptr != 0)
			{
				int16	X, Y;

				for (int SprCnt = *sprptr++; SprCnt > 0 && SprCount > 0; SprCnt--, sprptr += 4)
				{
					X = (int8) sprptr[1];
					if (SprAttr & 0x40)
						X = -X - ((sprptr[0] & 0x20) ? 16 : 8); // flip X
					X += SprX;

					if (X >= -16 && X <= 272)
					{
						Y = (int8) sprptr[2];
						if (SprAttr & 0x80)
							Y = -Y - ((sprptr[0] & 0x20) ? 16 : 8);
						Y += SprY;

						if (Y >= -16 && Y <= 224)
						{
							OAMptr[0] = X & 0xff;
							OAMptr[1] = (uint8) Y;
							OAMptr[2] = SprName + sprptr[3];
							OAMptr[3] = SprAttr ^ (sprptr[0] & 0xc0); // XXX: Carry from SprName addition?

							*OAMptr2 &= ~(3 << offset);
							if (X & 0x100)
								*OAMptr2 |= 1 << offset;
							if (sprptr[0] & 0x20)
								*OAMptr2 |= 2 << offset;

							OAMptr += 4;
							SprCount--;

							offset = (offset + 2) & 6;
							if (offset == 0)
								OAMptr2++;
						}
					}
				}
			}
			else
			if (SprCount > 0)
			{
				// XXX: Should we be testing -16<=SprX<=272 and -16<=SprY<=224?
				OAMptr[0] = (uint8) SprX;
				OAMptr[1] = (uint8) SprY;
				OAMptr[2] = SprName;
				OAMptr[3] = SprAttr;

				*OAMptr2 &= ~(3 << offset);
				if (SprX & 0x100)
					*OAMptr2 |= 3 << offset;
				else
					*OAMptr2 |= 2 << offset;

				OAMptr += 4;
				SprCount--;

				offset = (offset + 2) & 6;
				if (offset == 0)
					OAMptr2++;
			}
		}
	}
}

static void C4DoScaleRotate (int row_padding)
{
	int16	A, B, C, D;

	// Calculate matrix
	int32	XScale = READ_WORD(Memory.C4RAM + 0x1f8f);
	if (XScale & 0x8000)
		XScale = 0x7fff;

	int32	YScale = READ_WORD(Memory.C4RAM + 0x1f92);
	if (YScale & 0x8000)
		YScale = 0x7fff;

	if (READ_WORD(Memory.C4RAM + 0x1f80) == 0)		// no rotation
	{
		// XXX: only do this for C and D?
		// XXX: and then only when YScale is 0x1000?
		A = (int16) XScale;
		B = 0;
		C = 0;
		D = (int16) YScale;
	}
	else
	if (READ_WORD(Memory.C4RAM + 0x1f80) == 128)	// 90 degree rotation
	{
		// XXX: Really do this?
		A = 0;
		B = (int16) (-YScale);
		C = (int16) XScale;
		D = 0;
	}
	else
	if (READ_WORD(Memory.C4RAM + 0x1f80) == 256)	// 180 degree rotation
	{
		// XXX: Really do this?
		A = (int16) (-XScale);
		B = 0;
		C = 0;
		D = (int16) (-YScale);
	}
	else
	if (READ_WORD(Memory.C4RAM + 0x1f80) == 384)	// 270 degree rotation
	{
		// XXX: Really do this?
		A = 0;
		B = (int16) YScale;
		C = (int16) (-XScale);
		D = 0;
	}
	else
	{
		A = (int16)   SAR(C4CosTable[READ_WORD(Memory.C4RAM + 0x1f80) & 0x1ff] * XScale, 15);
		B = (int16) (-SAR(C4SinTable[READ_WORD(Memory.C4RAM + 0x1f80) & 0x1ff] * YScale, 15));
		C = (int16)   SAR(C4SinTable[READ_WORD(Memory.C4RAM + 0x1f80) & 0x1ff] * XScale, 15);
		D = (int16)   SAR(C4CosTable[READ_WORD(Memory.C4RAM + 0x1f80) & 0x1ff] * YScale, 15);
	}

	// Calculate Pixel Resolution
	uint8	w = Memory.C4RAM[0x1f89] & ~7;
	uint8	h = Memory.C4RAM[0x1f8c] & ~7;

	//printf("%dx%d XScale=%04x YScale=%04x angle=%03x\n", w, h, XScale, YScale, READ_WORD(Memory.C4RAM + 0x1f80) & 0x1ff);
	//printf("Matrix: [%10g %10g]  [%04x %04x]\n", A / 4096.0, B / 4096.0, A & 0xffff, B & 0xffff);
	//printf("        [%10g %10g]  [%04x %04x]\n", C / 4096.0, D / 4096.0, C & 0xffff, D & 0xffff);

	// Clear the output RAM
	memset(Memory.C4RAM, 0, (w + row_padding / 4) * h / 2);

	int32	Cx = (int16) READ_WORD(Memory.C4RAM + 0x1f83);
	int32	Cy = (int16) READ_WORD(Memory.C4RAM + 0x1f86);

#ifdef DEBUGGER
	if (Memory.C4RAM[0x1f97] != 0)
		printf("$7f97=%02x, expected 00\n", Memory.C4RAM[0x1f97]);
	if ((Cx & ~1) != w / 2 || (Cy & ~1) != h / 2)
		printf("Center is not middle of image! (%d, %d) != (%d, %d)\n", Cx, Cy, w / 2, h / 2);
#endif

	// Calculate start position (i.e. (Ox, Oy) = (0, 0))
	// The low 12 bits are fractional, so (Cx<<12) gives us the Cx we want in the function.
	// We do Cx*A etc normally because the matrix parameters already have the fractional parts.
	int32	LineX = (Cx << 12) - Cx * A - Cx * B;
	int32	LineY = (Cy << 12) - Cy * C - Cy * D;

	// Start loop
	uint32	X, Y;
	uint8	byte;
	int		outidx = 0;
	uint8	bit = 0x80;

	for (int y = 0; y < h; y++)
	{
		X = LineX;
		Y = LineY;

		for (int x = 0; x < w; x++)
		{
			if ((X >> 12) >= w || (Y >> 12) >= h)
				byte = 0;
			else
			{
				uint32	addr = (Y >> 12) * w + (X >> 12);
				byte = Memory.C4RAM[0x600 + (addr >> 1)];
				if (addr & 1)
					byte >>= 4;
			}

			// De-bitplanify
			if (byte & 1)
				Memory.C4RAM[outidx]      |= bit;
			if (byte & 2)
				Memory.C4RAM[outidx + 1]  |= bit;
			if (byte & 4)
				Memory.C4RAM[outidx + 16] |= bit;
			if (byte & 8)
				Memory.C4RAM[outidx + 17] |= bit;

			bit >>= 1;
			if (bit == 0)
			{
				bit = 0x80;
				outidx += 32;
			}

			X += A; // Add 1 to output x => add an A and a C
			Y += C;
		}

		outidx += 2 + row_padding;
		if (outidx & 0x10)
			outidx &= ~0x10;
		else
			outidx -= w * 4 + row_padding;

		LineX += B; // Add 1 to output y => add a B and a D
		LineY += D;
	}
}

static void C4DrawLine (int32 X1, int32 Y1, int16 Z1, int32 X2, int32 Y2, int16 Z2, uint8 Color)
{
	// Transform coordinates
	C4WFXVal  = (int16) X1;
	C4WFYVal  = (int16) Y1;
	C4WFZVal  = Z1;
	C4WFScale = Memory.C4RAM[0x1f90];
	C4WFX2Val = Memory.C4RAM[0x1f86];
	C4WFY2Val = Memory.C4RAM[0x1f87];
	C4WFDist  = Memory.C4RAM[0x1f88];
	C4TransfWireFrame2();
	X1 = (C4WFXVal + 48) << 8;
	Y1 = (C4WFYVal + 48) << 8;

	C4WFXVal  = (int16) X2;
	C4WFYVal  = (int16) Y2;
	C4WFZVal  = Z2;
	C4TransfWireFrame2();
	X2 = (C4WFXVal + 48) << 8;
	Y2 = (C4WFYVal + 48) << 8;

	// Get line info
	C4WFXVal  = (int16) (X1 >> 8);
	C4WFYVal  = (int16) (Y1 >> 8);
	C4WFX2Val = (int16) (X2 >> 8);
	C4WFY2Val = (int16) (Y2 >> 8);
	C4CalcWireFrame();
	X2 = (int16) C4WFXVal;
	Y2 = (int16) C4WFYVal;

	// Render line
	for (int i = C4WFDist ? C4WFDist : 1; i > 0; i--)
	{
		if (X1 > 0xff && Y1 > 0xff && X1 < 0x6000 && Y1 < 0x6000)
		{
			uint16	addr = (((Y1 >> 8) >> 3) << 8) - (((Y1 >> 8) >> 3) << 6) + (((X1 >> 8) >> 3) << 4) + ((Y1 >> 8) & 7) * 2;
			uint8	bit = 0x80 >> ((X1 >> 8) & 7);

			Memory.C4RAM[addr + 0x300] &= ~bit;
			Memory.C4RAM[addr + 0x301] &= ~bit;
			if (Color & 1)
				Memory.C4RAM[addr + 0x300] |= bit;
			if (Color & 2)
				Memory.C4RAM[addr + 0x301] |= bit;
		}

		X1 += X2;
		Y1 += Y2;
	}
}

static void C4DrawWireFrame (void)
{
	uint8	*line = C4GetMemPointer(READ_3WORD(Memory.C4RAM + 0x1f80));
	uint8	*point1, *point2;
	int16	X1, Y1, Z1;
	int16	X2, Y2, Z2;
	uint8	Color;

#ifdef DEBUGGER
	if (READ_3WORD(Memory.C4RAM + 0x1f8f) & 0xff00ff)
		printf("wireframe: Unexpected value in $7f8f: %06x\n", READ_3WORD(Memory.C4RAM + 0x1f8f));
	if (READ_3WORD(Memory.C4RAM + 0x1fa4) != 0x001000)
		printf("wireframe: Unexpected value in $7fa4: %06x\n", READ_3WORD(Memory.C4RAM + 0x1fa4));
#endif

	for (int i = Memory.C4RAM[0x0295]; i > 0; i--, line += 5)
	{
		if (line[0] == 0xff && line[1] == 0xff)
		{
			uint8	*tmp = line - 5;
			while (tmp[2] == 0xff && tmp[3] == 0xff)
				tmp -= 5;
			point1 = C4GetMemPointer((Memory.C4RAM[0x1f82] << 16) | (tmp[2]  << 8) |  tmp[3]);
		}
		else
			point1 = C4GetMemPointer((Memory.C4RAM[0x1f82] << 16) | (line[0] << 8) | line[1]);

		point2 = C4GetMemPointer((Memory.C4RAM[0x1f82] << 16) | (line[2] << 8) | line[3]);

		X1 = (point1[0] << 8) | point1[1];
		Y1 = (point1[2] << 8) | point1[3];
		Z1 = (point1[4] << 8) | point1[5];
		X2 = (point2[0] << 8) | point2[1];
		Y2 = (point2[2] << 8) | point2[3];
		Z2 = (point2[4] << 8) | point2[5];

		Color = line[4];

		C4DrawLine(X1, Y1, Z1, X2, Y2, Z2, Color);
	}
}

static void C4TransformLines (void)
{
	C4WFX2Val = Memory.C4RAM[0x1f83];
	C4WFY2Val = Memory.C4RAM[0x1f86];
	C4WFDist  = Memory.C4RAM[0x1f89];
	C4WFScale = Memory.C4RAM[0x1f8c];

#ifdef DEBUGGER
	if (Memory.C4RAM[0x1f8a] != 0x90)
		printf("lines: $7f8a = %02x, expected 90\n", READ_WORD(Memory.C4RAM + 0x1f8a));
#endif

	// Transform vertices
	uint8	*ptr = Memory.C4RAM;

	for (int i = READ_WORD(Memory.C4RAM + 0x1f80); i > 0; i--, ptr += 0x10)
	{
		C4WFXVal = READ_WORD(ptr + 1);
		C4WFYVal = READ_WORD(ptr + 5);
		C4WFZVal = READ_WORD(ptr + 9);
		C4TransfWireFrame();

		// Displace
		WRITE_WORD(ptr + 1, C4WFXVal + 0x80);
		WRITE_WORD(ptr + 5, C4WFYVal + 0x50);
	}

	WRITE_WORD(Memory.C4RAM + 0x600,       23);
	WRITE_WORD(Memory.C4RAM + 0x602,     0x60);
	WRITE_WORD(Memory.C4RAM + 0x605,     0x40);
	WRITE_WORD(Memory.C4RAM + 0x600 + 8,   23);
	WRITE_WORD(Memory.C4RAM + 0x602 + 8, 0x60);
	WRITE_WORD(Memory.C4RAM + 0x605 + 8, 0x40);

	ptr = Memory.C4RAM + 0xb02;
	uint8	*ptr2 = Memory.C4RAM;

	for (int i = READ_WORD(Memory.C4RAM + 0xb00); i > 0; i--, ptr += 2, ptr2 += 8)
	{
		C4WFXVal  = READ_WORD(Memory.C4RAM + (ptr[0] << 4) + 1);
		C4WFYVal  = READ_WORD(Memory.C4RAM + (ptr[0] << 4) + 5);
		C4WFX2Val = READ_WORD(Memory.C4RAM + (ptr[1] << 4) + 1);
		C4WFY2Val = READ_WORD(Memory.C4RAM + (ptr[1] << 4) + 5);
		C4CalcWireFrame();

		WRITE_WORD(ptr2 + 0x600, C4WFDist ? C4WFDist : 1);
		WRITE_WORD(ptr2 + 0x602, C4WFXVal);
		WRITE_WORD(ptr2 + 0x605, C4WFYVal);
	}
}

static void C4BitPlaneWave (void)
{
	static uint16 bmpdata[] =
	{
		0x0000, 0x0002, 0x0004, 0x0006, 0x0008, 0x000A, 0x000C, 0x000E,
		0x0200, 0x0202, 0x0204, 0x0206, 0x0208, 0x020A, 0x020C, 0x020E,
		0x0400, 0x0402, 0x0404, 0x0406, 0x0408, 0x040A, 0x040C, 0x040E,
		0x0600, 0x0602, 0x0604, 0x0606, 0x0608, 0x060A, 0x060C, 0x060E,
		0x0800, 0x0802, 0x0804, 0x0806, 0x0808, 0x080A, 0x080C, 0x080E
	};

	uint8	*dst = Memory.C4RAM;
	uint32	waveptr = Memory.C4RAM[0x1f83];
	uint16	mask1 = 0xc0c0;
	uint16	mask2 = 0x3f3f;

#ifdef DEBUGGER
	if (READ_3WORD(Memory.C4RAM + 0x1f80) != Memory.C4RAM[waveptr + 0xb00])
		printf("$7f80=%06x, expected %02x\n", READ_3WORD(Memory.C4RAM + 0x1f80), Memory.C4RAM[waveptr + 0xb00]);
#endif

	for (int j = 0; j < 0x10; j++)
	{
		do
		{
			int16	height = -((int8) Memory.C4RAM[waveptr + 0xb00]) - 16;

			for (int i = 0; i < 40; i++)
			{
				uint16	tmp = READ_WORD(dst + bmpdata[i]) & mask2;
				if (height >= 0)
				{
					if (height < 8)
						tmp |= mask1 & READ_WORD(Memory.C4RAM + 0xa00 + height * 2);
					else
						tmp |= mask1 & 0xff00;
				}

				WRITE_WORD(dst + bmpdata[i], tmp);

				height++;
			}

			waveptr = (waveptr + 1) & 0x7f;
			mask1 = (mask1 >> 2) | (mask1 << 6);
			mask2 = (mask2 >> 2) | (mask2 << 6);
		}
		while (mask1 != 0xc0c0);

		dst += 16;

		do
		{
			int16	height = -((int8) Memory.C4RAM[waveptr + 0xb00]) - 16;

			for (int i = 0; i < 40; i++)
			{
				uint16	tmp = READ_WORD(dst + bmpdata[i]) & mask2;
				if (height >= 0)
				{
					if (height < 8)
						tmp |= mask1 & READ_WORD(Memory.C4RAM + 0xa10 + height * 2);
					else
						tmp |= mask1 & 0xff00;
				}

				WRITE_WORD(dst + bmpdata[i], tmp);

				height++;
			}

			waveptr = (waveptr + 1) & 0x7f;
			mask1 = (mask1 >> 2) | (mask1 << 6);
			mask2 = (mask2 >> 2) | (mask2 << 6);
		}
		while (mask1 != 0xc0c0);

		dst += 16;
	}
}

static void C4SprDisintegrate (void)
{
	uint8	*src;
	uint8	width, height;
	uint32	StartX, StartY;
	int32	scaleX, scaleY;
	int32	Cx, Cy;

	width  = Memory.C4RAM[0x1f89];
	height = Memory.C4RAM[0x1f8c];
	Cx = (int16) READ_WORD(Memory.C4RAM + 0x1f80);
	Cy = (int16) READ_WORD(Memory.C4RAM + 0x1f83);

#ifdef DEBUGGER
	if ((Cx & ~1) != width / 2 || (Cy & ~1) != height / 2)
		printf("Center is not middle of image for disintegrate! (%d, %d) != (%d, %d)\n", Cx, Cy, width / 2, height / 2);
#endif

	scaleX = (int16) READ_WORD(Memory.C4RAM + 0x1f86);
	scaleY = (int16) READ_WORD(Memory.C4RAM + 0x1f8f);
	StartX = -Cx * scaleX + (Cx << 8);
	StartY = -Cy * scaleY + (Cy << 8);

	src = Memory.C4RAM + 0x600;

	memset(Memory.C4RAM, 0, width * height / 2);

	for (uint32 y = StartY, i = 0; i < height; i++, y += scaleY)
	{
		for (uint32 x = StartX, j = 0; j < width; j++, x += scaleX)
		{
			if ((x >> 8) < width && (y >> 8) < height && (y >> 8) * width + (x >> 8) < 0x2000)
			{
				uint8	pixel = (j & 1) ? (*src >> 4) : *src;
				int		idx   = (y >> 11) * width * 4 + (x >> 11) * 32 + ((y >> 8) & 7) * 2;
				uint8	mask  = 0x80 >> ((x >> 8) & 7);

				if (pixel & 1)
					Memory.C4RAM[idx]      |= mask;
				if (pixel & 2)
					Memory.C4RAM[idx + 1]  |= mask;
				if (pixel & 4)
					Memory.C4RAM[idx + 16] |= mask;
				if (pixel & 8)
					Memory.C4RAM[idx + 17] |= mask;
			}

			if (j & 1)
				src++;
		}
	}
}

static void C4ProcessSprites (void)
{
	switch (Memory.C4RAM[0x1f4d])
	{
		case 0x00: // Build OAM
		#ifdef DEBUGGER
			//printf("00 00 Build OAM!\n");
		#endif
			C4ConvOAM();
			break;

		case 0x03: // Scale/Rotate
		#ifdef DEBUGGER
			//printf("00 03 Scale/Rotate!\n");
		#endif
			C4DoScaleRotate(0);
			break;

		case 0x05: // Transform Lines
		#ifdef DEBUGGER
			//printf("00 05 Transform Lines!\n");
		#endif
			C4TransformLines();
			break;

		case 0x07: // Scale/Rotate
		#ifdef DEBUGGER
			//printf("00 07 Scale/Rotate!\n");
		#endif
			C4DoScaleRotate(64);
			break;

		case 0x08: // Draw wireframe
		#ifdef DEBUGGER
			//printf("00 08 Draw wireframe!\n");
		#endif
			C4DrawWireFrame();
			break;

		case 0x0b: // Disintegrate
		#ifdef DEBUGGER
			//printf("00 0b Disintegrate!\n");
		#endif
			C4SprDisintegrate();
			break;

		case 0x0c: // Wave
		#ifdef DEBUGGER
			//printf("00 0b Wave!\n");
		#endif
			C4BitPlaneWave();
			break;

		default:
		#ifdef DEBUGGER
			printf("Unknown C4 sprite command (%02x)\n", Memory.C4RAM[0x1f4d]);
		#endif
			break;
	}
}

void S9xInitC4 (void)
{
	// Stupid zsnes code, we can't do the logical thing without breaking savestates
	// Memory.C4RAM = &Memory.FillRAM [0x6000];
	memset(Memory.C4RAM, 0, 0x2000);
}

uint8 S9xGetC4 (uint16 Address)
{
	if (Address == 0x7f5e)
		return (0);

	return (Memory.C4RAM[Address - 0x6000]);
}

void S9xSetC4 (uint8 byte, uint16 Address)
{
	Memory.C4RAM[Address - 0x6000] = byte;

	if (Address == 0x7f4f)
	{
		if (Memory.C4RAM[0x1f4d] == 0x0e && byte < 0x40 && (byte & 3) == 0)
		{
		#ifdef DEBUGGER
			printf("Test command %02x 0e used!\n", byte);
		#endif
			Memory.C4RAM[0x1f80] = byte >> 2;
		}
		else
		{
			switch (byte)
			{
				case 0x00: // Sprite
				#ifdef DEBUGGER
					//printf("00 Sprite!\n");
				#endif
					C4ProcessSprites();
					break;

				case 0x01: // Draw wireframe
				#ifdef DEBUGGER
					//printf("01 Draw wireframe!\n");
					if (Memory.C4RAM[0x1f4d] != 8)
						printf("$7f4d=%02x, expected 08 for command 01 %02x\n", Memory.C4RAM[0x1f4d], Memory.C4RAM[0x1f4d]);
				#endif
					memset(Memory.C4RAM + 0x300, 0, 16 * 12 * 3 * 4);
					C4DrawWireFrame();
					break;

				case 0x05: // Propulsion (?)
				{
				#ifdef DEBUGGER
					//printf("05 Propulsion (?)!\n");
					if (Memory.C4RAM[0x1f4d] != 2)
						printf("$7f4d=%02x, expected 02 for command 05 %02x\n", Memory.C4RAM[0x1f4d], Memory.C4RAM[0x1f4d]);
				#endif
					int32	tmp = 0x10000;
					if (READ_WORD(Memory.C4RAM + 0x1f83))
						tmp = SAR((tmp / READ_WORD(Memory.C4RAM + 0x1f83)) * READ_WORD(Memory.C4RAM + 0x1f81), 8);

					WRITE_WORD(Memory.C4RAM + 0x1f80, (uint16) tmp);
					break;
				}

				case 0x0d: // Set vector length
				#ifdef DEBUGGER
					//printf("0d Set vector length!\n");
					if (Memory.C4RAM[0x1f4d] != 2)
						printf("$7f4d=%02x, expected 02 for command 0d %02x\n", Memory.C4RAM[0x1f4d], Memory.C4RAM[0x1f4d]);
				#endif
					C41FXVal    = READ_WORD(Memory.C4RAM + 0x1f80);
					C41FYVal    = READ_WORD(Memory.C4RAM + 0x1f83);
					C41FDistVal = READ_WORD(Memory.C4RAM + 0x1f86);
					C4Op0D();
					WRITE_WORD(Memory.C4RAM + 0x1f89, C41FXVal);
					WRITE_WORD(Memory.C4RAM + 0x1f8c, C41FYVal);
					break;

				case 0x10: // Polar to rectangluar
				{
				#ifdef DEBUGGER
					//printf("10 Polar->Rect!\n");
					if (Memory.C4RAM[0x1f4d] != 2)
						printf("$7f4d=%02x, expected 02 for command 10 %02x\n", Memory.C4RAM[0x1f4d], Memory.C4RAM[0x1f4d]);
				#endif
					int32	tmp;
					int32   r1;
					r1 = READ_WORD(Memory.C4RAM + 0x1f83);
					if (r1 & 0x8000)
					        r1 |= ~0x7fff;
					else
					        r1 &= 0x7fff;				
										
					tmp = SAR(r1 * C4CosTable[READ_WORD(Memory.C4RAM + 0x1f80) & 0x1ff] * 2, 16);
					WRITE_3WORD(Memory.C4RAM + 0x1f86, tmp);
					tmp = SAR(r1 * C4SinTable[READ_WORD(Memory.C4RAM + 0x1f80) & 0x1ff] * 2, 16);
					WRITE_3WORD(Memory.C4RAM + 0x1f89, (tmp - SAR(tmp, 6)));
					break;
				}

				case 0x13: // Polar to rectangluar
				{
				#ifdef DEBUGGER
					//printf("13 Polar->Rect!\n");
					if (Memory.C4RAM[0x1f4d] != 2)
						printf("$7f4d=%02x, expected 02 for command 13 %02x\n", Memory.C4RAM[0x1f4d], Memory.C4RAM[0x1f4d]);
				#endif
					int32	tmp;
					tmp = SAR((int32) READ_WORD(Memory.C4RAM + 0x1f83) * C4CosTable[READ_WORD(Memory.C4RAM + 0x1f80) & 0x1ff] * 2, 8);
					WRITE_3WORD(Memory.C4RAM + 0x1f86, tmp);
					tmp = SAR((int32) READ_WORD(Memory.C4RAM + 0x1f83) * C4SinTable[READ_WORD(Memory.C4RAM + 0x1f80) & 0x1ff] * 2, 8);
					WRITE_3WORD(Memory.C4RAM + 0x1f89, tmp);
					break;
				}

				case 0x15: // Pythagorean
				#ifdef DEBUGGER
					//printf("15 Pythagorean!\n");
					if (Memory.C4RAM[0x1f4d] != 2)
						printf("$7f4d=%02x, expected 02 for command 15 %02x\n", Memory.C4RAM[0x1f4d], Memory.C4RAM[0x1f4d]);
				#endif
					C41FXVal = READ_WORD(Memory.C4RAM + 0x1f80);
					C41FYVal = READ_WORD(Memory.C4RAM + 0x1f83);
					//C4Op15(); // optimized to:
					C41FDist = (int16) sqrt((double) C41FXVal * C41FXVal + (double) C41FYVal * C41FYVal);
					WRITE_WORD(Memory.C4RAM + 0x1f80, C41FDist);
					break;

				case 0x1f: // atan
				#ifdef DEBUGGER
					//printf("1f atan!\n");
					if (Memory.C4RAM[0x1f4d] != 2)
						printf("$7f4d=%02x, expected 02 for command 1f %02x\n", Memory.C4RAM[0x1f4d], Memory.C4RAM[0x1f4d]);
				#endif
					C41FXVal = READ_WORD(Memory.C4RAM + 0x1f80);
					C41FYVal = READ_WORD(Memory.C4RAM + 0x1f83);
					C4Op1F();
					WRITE_WORD(Memory.C4RAM + 0x1f86, C41FAngleRes);
					break;

				case 0x22: // Trapezoid
				{
				#ifdef DEBUGGER
					//printf("22 Trapezoid!\n");
					if (Memory.C4RAM[0x1f4d] != 2)
						printf("$7f4d=%02x, expected 02 for command 22 %02x\n", Memory.C4RAM[0x1f4d], Memory.C4RAM[0x1f4d]);
				#endif
					int16	angle1 = READ_WORD(Memory.C4RAM + 0x1f8c) & 0x1ff;
					int16	angle2 = READ_WORD(Memory.C4RAM + 0x1f8f) & 0x1ff;

				#ifdef DEBUGGER
					if (C4CosTable[angle1] == 0)
						fprintf(stderr, "22 Trapezoid: Invalid tangent! angle1=%d\n", angle1);
					if (C4CosTable[angle2] == 0)
						fprintf(stderr, "22 Trapezoid: Invalid tangent! angle2=%d\n", angle2);
				#endif

					int32	tan1 = (C4CosTable[angle1] != 0) ? ((((int32) C4SinTable[angle1]) << 16) / C4CosTable[angle1]) : 0x80000000;
					int32	tan2 = (C4CosTable[angle2] != 0) ? ((((int32) C4SinTable[angle2]) << 16) / C4CosTable[angle2]) : 0x80000000;

					int16	y = READ_WORD(Memory.C4RAM + 0x1f83) - READ_WORD(Memory.C4RAM + 0x1f89);
					int16	left, right;

					for (int j = 0; j < 225; j++)
					{
						if (y >= 0)
						{
							left  = SAR((int32) tan1 * y, 16) - READ_WORD(Memory.C4RAM + 0x1f80) + READ_WORD(Memory.C4RAM + 0x1f86);
							right = SAR((int32) tan2 * y, 16) - READ_WORD(Memory.C4RAM + 0x1f80) + READ_WORD(Memory.C4RAM + 0x1f86) + READ_WORD(Memory.C4RAM + 0x1f93);

							if (left < 0 && right < 0)
							{
								left  = 1;
								right = 0;
							}
							else
							if (left  < 0)
								left  = 0;
							else
							if (right < 0)
								right = 0;

							if (left > 255 && right > 255)
							{
								left  = 255;
								right = 254;
							}
							else
							if (left  > 255)
								left  = 255;
							else
							if (right > 255)
								right = 255;
						}
						else
						{
							left  = 1;
							right = 0;
						}

						Memory.C4RAM[j + 0x800] = (uint8) left;
						Memory.C4RAM[j + 0x900] = (uint8) right;

						y++;
					}

					break;
				}

				case 0x25: // Multiply
				{
				#ifdef DEBUGGER
					//printf("25 Multiply!\n");
					if (Memory.C4RAM[0x1f4d] != 2)
						printf("$7f4d=%02x, expected 02 for command 25 %02x\n", Memory.C4RAM[0x1f4d], Memory.C4RAM[0x1f4d]);
				#endif
					int32	foo = READ_3WORD(Memory.C4RAM + 0x1f80);
					int32	bar = READ_3WORD(Memory.C4RAM + 0x1f83);
					foo *= bar;
					WRITE_3WORD(Memory.C4RAM + 0x1f80, foo);
					break;
				}

				case 0x2d: // Transform Coords
				#ifdef DEBUGGER
					//printf("2d Transform Coords!\n");
					if (Memory.C4RAM[0x1f4d] != 2)
						printf("$7f4d=%02x, expected 02 for command 2d %02x\n", Memory.C4RAM[0x1f4d], Memory.C4RAM[0x1f4d]);
					if (READ_3WORD(Memory.C4RAM + 0x1f8f) & 0xff00ff)
						printf("2d transform coords: Unexpected value in $7f8f: %06x\n", READ_3WORD(Memory.C4RAM + 0x1f8f));
					if (READ_3WORD(Memory.C4RAM + 0x1f8c) != 0x001000)
						printf("0d transform coords: Unexpected value in $7f8c: %06x\n", READ_3WORD(Memory.C4RAM + 0x1f8c));
				#endif
					C4WFXVal  = READ_WORD(Memory.C4RAM + 0x1f81);
					C4WFYVal  = READ_WORD(Memory.C4RAM + 0x1f84);
					C4WFZVal  = READ_WORD(Memory.C4RAM + 0x1f87);
					C4WFX2Val = Memory.C4RAM[0x1f89];
					C4WFY2Val = Memory.C4RAM[0x1f8a];
					C4WFDist  = Memory.C4RAM[0x1f8b];
					C4WFScale = READ_WORD(Memory.C4RAM + 0x1f90);
					C4TransfWireFrame2();
					WRITE_WORD(Memory.C4RAM + 0x1f80, C4WFXVal);
					WRITE_WORD(Memory.C4RAM + 0x1f83, C4WFYVal);
					break;

				case 0x40: // Sum
				{
				#ifdef DEBUGGER
					//printf("40 Sum!\n");
					if (Memory.C4RAM[0x1f4d] != 0x0e)
						printf("$7f4d=%02x, expected 0e for command 40 %02x\n", Memory.C4RAM[0x1f4d], Memory.C4RAM[0x1f4d]);
				#endif
					uint16	sum = 0;
					for (int i = 0; i < 0x800; sum += Memory.C4RAM[i++]) ;
					WRITE_WORD(Memory.C4RAM + 0x1f80, sum);
					break;
				}

				case 0x54: // Square
				{
				#ifdef DEBUGGER
					//printf("54 Square!\n");
					if (Memory.C4RAM[0x1f4d] != 0x0e)
						printf("$7f4d=%02x, expected 0e for command 54 %02x\n", Memory.C4RAM[0x1f4d], Memory.C4RAM[0x1f4d]);
				#endif
					int64	a = SAR((int64) READ_3WORD(Memory.C4RAM + 0x1f80) << 40, 40);
					//printf("%08X%08X\n", (uint32) (a>>32), (uint32) (a&0xFFFFFFFF));
					a *= a;
					//printf("%08X%08X\n", (uint32) (a>>32), (uint32) (a&0xFFFFFFFF));
					WRITE_3WORD(Memory.C4RAM + 0x1f83, a);
					WRITE_3WORD(Memory.C4RAM + 0x1f86, (a >> 24));
					break;
				}

				case 0x5c: // Immediate Reg
				#ifdef DEBUGGER
					//printf("5c Immediate Reg!\n");
					if (Memory.C4RAM[0x1f4d] != 0x0e)
						printf("$7f4d=%02x, expected 0e for command 5c %02x\n", Memory.C4RAM[0x1f4d], Memory.C4RAM[0x1f4d]);
				#endif
					for (int i = 0; i < 12 * 4; i++)
						Memory.C4RAM[i] = C4TestPattern[i];
					break;

				case 0x89: // Immediate ROM
				#ifdef DEBUGGER
					//printf("89 Immediate ROM!\n");
					if (Memory.C4RAM[0x1f4d] != 0x0e)
						printf("$7f4d=%02x, expected 0e for command 89 %02x\n", Memory.C4RAM[0x1f4d], Memory.C4RAM[0x1f4d]);
				#endif
					Memory.C4RAM[0x1f80] = 0x36;
					Memory.C4RAM[0x1f81] = 0x43;
					Memory.C4RAM[0x1f82] = 0x05;
					break;

				default:
				#ifdef DEBUGGER
					printf("Unknown C4 command (%02x)\n", byte);
				#endif
					break;
			}
		}
	}
	else
	if (Address == 0x7f47)
	{
	#ifdef DEBUGGER
		//printf("C4 load memory %06x => %04x, %04x bytes\n", READ_3WORD(Memory.C4RAM + 0x1f40), READ_WORD(Memory.C4RAM + 0x1f45), READ_WORD(Memory.C4RAM + 0x1f43));
		if (byte != 0)
			printf("C4 load: non-0 written to $7f47! Wrote %02x\n", byte);
		if (READ_WORD(Memory.C4RAM + 0x1f45) < 0x6000 || (READ_WORD(Memory.C4RAM + 0x1f45) + READ_WORD(Memory.C4RAM + 0x1f43)) > 0x6c00)
			printf("C4 load: Dest unusual! It's %04x\n", READ_WORD(Memory.C4RAM + 0x1f45));
	#endif
		memmove(Memory.C4RAM + (READ_WORD(Memory.C4RAM + 0x1f45) & 0x1fff), C4GetMemPointer(READ_3WORD(Memory.C4RAM + 0x1f40)), READ_WORD(Memory.C4RAM + 0x1f43));
	}
}