MCUME/MCUME_teensy/teensynofrendo/map009.c

200 wiersze
4.8 KiB
C

/*
** Nofrendo (c) 1998-2000 Matthew Conte (matt@conte.com)
**
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of version 2 of the GNU Library General
** Public License as published by the Free Software Foundation.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Library General Public License for more details. To obtain a
** copy of the GNU Library General Public License, write to the Free
** Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
** Any permitted reproduction of these routines, in whole or in part,
** must bear this legend.
**
**
** map9.c
**
** mapper 9 interface
** $Id: map009.c,v 1.2 2001/04/27 14:37:11 neil Exp $
*/
#include <string.h>
#include "noftypes.h"
#include "nes_mmc.h"
#include "nes_ppu.h"
#include "libsnss.h"
static uint8 latch[2];
static uint8 regs[4];
/* Used when tile $FD/$FE is accessed */
static void mmc9_latchfunc(uint32 address, uint8 value)
{
if (0xFD == value || 0xFE == value)
{
int reg;
if (address)
{
latch[1] = value;
reg = 2 + (value - 0xFD);
}
else
{
latch[0] = value;
reg = value - 0xFD;
}
mmc_bankvrom(4, address, regs[reg]);
}
}
/* mapper 9: MMC2 */
/* MMC2: Punch-Out! */
static void map9_write(uint32 address, uint8 value)
{
switch ((address & 0xF000) >> 12)
{
case 0xA:
mmc_bankrom(8, 0x8000, value);
break;
case 0xB:
regs[0] = value;
if (0xFD == latch[0])
mmc_bankvrom(4, 0x0000, value);
break;
case 0xC:
regs[1] = value;
if (0xFE == latch[0])
mmc_bankvrom(4, 0x0000, value);
break;
case 0xD:
regs[2] = value;
if (0xFD == latch[1])
mmc_bankvrom(4, 0x1000, value);
break;
case 0xE:
regs[3] = value;
if (0xFE == latch[1])
mmc_bankvrom(4, 0x1000, value);
break;
case 0xF:
if (value & 1)
ppu_mirror(0, 0, 1, 1); /* horizontal */
else
ppu_mirror(0, 1, 0, 1); /* vertical */
break;
default:
break;
}
}
static void map9_init(void)
{
memset(regs, 0, sizeof(regs));
mmc_bankrom(8, 0x8000, 0);
mmc_bankrom(8, 0xA000, (mmc_getinfo()->rom_banks * 2) - 3);
mmc_bankrom(8, 0xC000, (mmc_getinfo()->rom_banks * 2) - 2);
mmc_bankrom(8, 0xE000, (mmc_getinfo()->rom_banks * 2) - 1);
latch[0] = 0xFE;
latch[1] = 0xFE;
ppu_setlatchfunc(mmc9_latchfunc);
}
static void map9_getstate(SnssMapperBlock *state)
{
state->extraData.mapper9.latch[0] = latch[0];
state->extraData.mapper9.latch[1] = latch[1];
state->extraData.mapper9.lastB000Write = regs[0];
state->extraData.mapper9.lastC000Write = regs[1];
state->extraData.mapper9.lastD000Write = regs[2];
state->extraData.mapper9.lastE000Write = regs[3];
}
static void map9_setstate(SnssMapperBlock *state)
{
latch[0] = state->extraData.mapper9.latch[0];
latch[1] = state->extraData.mapper9.latch[1];
regs[0] = state->extraData.mapper9.lastB000Write;
regs[1] = state->extraData.mapper9.lastC000Write;
regs[2] = state->extraData.mapper9.lastD000Write;
regs[3] = state->extraData.mapper9.lastE000Write;
}
static map_memwrite map9_memwrite[] =
{
{ 0x8000, 0xFFFF, map9_write },
{ -1, -1, NULL }
};
const mapintf_t map9_intf =
{
9, /* mapper number */
"MMC2", /* mapper name */
map9_init, /* init routine */
NULL, /* vblank callback */
NULL, /* hblank callback */
map9_getstate, /* get state (snss) */
map9_setstate, /* set state (snss) */
NULL, /* memory read structure */
map9_memwrite, /* memory write structure */
NULL /* external sound device */
};
/*
** $Log: map009.c,v $
** Revision 1.2 2001/04/27 14:37:11 neil
** wheeee
**
** Revision 1.1 2001/04/27 12:54:40 neil
** blah
**
** Revision 1.1.1.1 2001/04/27 07:03:54 neil
** initial
**
** Revision 1.1 2000/10/24 12:19:33 matt
** changed directory structure
**
** Revision 1.9 2000/10/22 19:17:46 matt
** mapper cleanups galore
**
** Revision 1.8 2000/10/22 15:03:14 matt
** simplified mirroring
**
** Revision 1.7 2000/10/21 19:33:38 matt
** many more cleanups
**
** Revision 1.6 2000/07/17 05:11:35 matt
** minor update from making PPU code less filthy
**
** Revision 1.5 2000/07/15 23:52:19 matt
** rounded out a bunch more mapper interfaces
**
** Revision 1.4 2000/07/10 05:29:03 matt
** cleaned up some mirroring issues
**
** Revision 1.3 2000/07/06 02:48:43 matt
** clearly labelled structure members
**
** Revision 1.2 2000/07/05 22:50:33 matt
** fixed punchout -- works 100% now
**
** Revision 1.1 2000/07/05 05:05:18 matt
** initial revision
**
*/