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c4emu.cpp
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c4emu.cpp
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/***********************************************************************************
Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
(c) Copyright 1996 - 2002 Gary Henderson (gary.henderson@ntlworld.com),
Jerremy Koot (jkoot@snes9x.com)
(c) Copyright 2002 - 2004 Matthew Kendora
(c) Copyright 2002 - 2005 Peter Bortas (peter@bortas.org)
(c) Copyright 2004 - 2005 Joel Yliluoma (http://iki.fi/bisqwit/)
(c) Copyright 2001 - 2006 John Weidman (jweidman@slip.net)
(c) Copyright 2002 - 2006 funkyass (funkyass@spam.shaw.ca),
Kris Bleakley (codeviolation@hotmail.com)
(c) Copyright 2002 - 2010 Brad Jorsch (anomie@users.sourceforge.net),
Nach (n-a-c-h@users.sourceforge.net),
zones (kasumitokoduck@yahoo.com)
(c) Copyright 2006 - 2007 nitsuja
(c) Copyright 2009 - 2010 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_ (_demo_@zsnes.com),
Nach,
zsKnight (zsknight@zsnes.com)
C4 C++ code
(c) Copyright 2003 - 2006 Brad Jorsch,
Nach
DSP-1 emulator code
(c) Copyright 1998 - 2006 _Demo_,
Andreas Naive (andreasnaive@gmail.com),
Gary Henderson,
Ivar (ivar@snes9x.com),
John Weidman,
Kris Bleakley,
Matthew Kendora,
Nach,
neviksti (neviksti@hotmail.com)
DSP-2 emulator code
(c) Copyright 2003 John Weidman,
Kris Bleakley,
Lord Nightmare (lord_nightmare@users.sourceforge.net),
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 (pagefault@zsnes.com),
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 (gblargg@gmail.com)
SH assembler code partly based on x86 assembler code
(c) Copyright 2002 - 2004 Marcus Comstedt (marcus@mc.pp.se)
2xSaI filter
(c) Copyright 1999 - 2001 Derek Liauw Kie Fa
HQ2x, HQ3x, HQ4x filters
(c) Copyright 2003 Maxim Stepin (maxim@hiend3d.com)
NTSC filter
(c) Copyright 2006 - 2007 Shay Green
GTK+ GUI code
(c) Copyright 2004 - 2010 BearOso
Win32 GUI code
(c) Copyright 2003 - 2006 blip,
funkyass,
Matthew Kendora,
Nach,
nitsuja
(c) Copyright 2009 - 2010 OV2
Mac OS GUI code
(c) Copyright 1998 - 2001 John Stiles
(c) Copyright 2001 - 2010 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_ALIGNED(srcptr) - globalX;
SprY = READ_WORD_ALIGNED(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_ALIGNED(Memory.C4RAM + 0x1f92);
if (YScale & 0x8000)
YScale = 0x7fff;
if (READ_WORD_ALIGNED(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_ALIGNED(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_ALIGNED(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_ALIGNED(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_ALIGNED(Memory.C4RAM + 0x1f80) & 0x1ff] * XScale, 15);
B = (int16) (-SAR(C4SinTable[READ_WORD_ALIGNED(Memory.C4RAM + 0x1f80) & 0x1ff] * YScale, 15));
C = (int16) SAR(C4SinTable[READ_WORD_ALIGNED(Memory.C4RAM + 0x1f80) & 0x1ff] * XScale, 15);
D = (int16) SAR(C4CosTable[READ_WORD_ALIGNED(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_ALIGNED(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_ALIGNED(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_ALIGNED(Memory.C4RAM + 0x600, 23);
WRITE_WORD_ALIGNED(Memory.C4RAM + 0x602, 0x60);
WRITE_WORD_ALIGNED(Memory.C4RAM + 0x605, 0x40);
WRITE_WORD_ALIGNED(Memory.C4RAM + 0x600 + 8, 23);
WRITE_WORD_ALIGNED(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_ALIGNED(Memory.C4RAM + 0xb00); i > 0; i--, ptr += 2, ptr2 += 8)
{
C4WFXVal = READ_WORD_ALIGNED(Memory.C4RAM + (ptr[0] << 4) + 1);
C4WFYVal = READ_WORD_ALIGNED(Memory.C4RAM + (ptr[0] << 4) + 5);
C4WFX2Val = READ_WORD_ALIGNED(Memory.C4RAM + (ptr[1] << 4) + 1);
C4WFY2Val = READ_WORD_ALIGNED(Memory.C4RAM + (ptr[1] << 4) + 5);
C4CalcWireFrame();
WRITE_WORD_ALIGNED(ptr2 + 0x600, C4WFDist ? C4WFDist : 1);
WRITE_WORD_ALIGNED(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_ALIGNED(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_ALIGNED(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_ALIGNED(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_ALIGNED(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_ALIGNED(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_ALIGNED(Memory.C4RAM + 0x1f80);