Genesis-Plus-GX/source/input_hw/teamplayer.c

161 lines
4.2 KiB
C
Raw Normal View History

[Core/VDP] --------------- * added support for Master System compatibility mode (Z80 ports access mode), incl. Mode 5 rendering. * added Mode 4 rendering for both Genesis & Master System modes. * added alternate BG planes rendering functions (should be faster on PPC architectures). [Core/IO] --------------- * added support for Master System compatibility mode (Z80 ports access mode). * added Master System peripherals emulation (Control Pad, Paddle, Sports Pad & Light Phaser). * added XE-1AP (analog controller) emulation. * added Activator emulation. [Core/Extra] --------------- * added support for all known Master System cartridge mappers. * added copy-protection hardware emulation for a few MD unlicensed games: fixes 777 Casino (crash when talking to bunny girls). (NB: most of those unlicensed games seem to have been already patched by ROM dumpers, main purpose is documenting them) * added support for Top Shooter arcade board controller. (A=Shoot, B=Bet, C/RIGHT=Coins, START=Start, hold UP on startup to enter service mode) * improved King of Fighters 98 mapper emulation (registers address decoding is now 100% accurate) * fixed Game Genie when several codes affect same ROM address. * fixed EEPROM types for Brian Lara Cricket & NBA Jam TE (verified on real cartridges) [Core/General] --------------- * added Master System compatibility mode emulation (automatically enabled when loading ROM file with .sms extension). * improved savestate stability & compatibility (support for old 1.4.x savestates is preserved) * various code cleanup & comments. [Gamecube/Wii] --------------- * fixed cheat codes handling when several codes affect same ROM address. * improved input controller detection on menu exit. * improved key remapping dialog box to match emulated device * changed Menu key for Gamecube controller to allow MODE button mapping * fixed DVD not being unmounted on swap (memory leak) [Wii only] --------------- * added USB mouse support for Sega Mouse emulation * compiled with latest libogc: improves USB compatibility & fixes stability issues with Wiimotes.
2011-04-01 00:11:05 +02:00
/***************************************************************************************
* Genesis Plus
* Team Player support
*
* Copyright Eke-Eke (2007-2011)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
****************************************************************************************/
#include "shared.h"
static struct
{
uint8 State;
uint8 Counter;
uint8 Table[12];
} teamplayer[2];
void teamplayer_init(int port)
{
int i,padnum;
int index = 0;
/* this table determines which gamepad input should be returned during acquisition sequence
index = teamplayer read table index: 0=1st read, 1=2nd read, ...
table = high bits are pad index, low bits are pad input shift: 0=RLDU, 4=SABC, 8=MXYZ
*/
for (i=0; i<4; i++)
{
padnum = (4 * port) + i;
if (input.dev[padnum] == DEVICE_PAD3B)
{
padnum = padnum << 4;
teamplayer[port].Table[index++] = padnum;
teamplayer[port].Table[index++] = padnum | 4;
}
else
{
padnum = padnum << 4;
teamplayer[port].Table[index++] = padnum;
teamplayer[port].Table[index++] = padnum | 4;
teamplayer[port].Table[index++] = padnum | 8;
}
}
}
void teamplayer_reset(int port)
{
teamplayer[port].State = 0x60; /* TH = 1, TR = 1 */
teamplayer[port].Counter = 0;
}
static inline unsigned int teamplayer_read(int port)
{
unsigned int counter = teamplayer[port].Counter;
/* acquisition sequence */
switch (counter)
{
case 0: /* initial state: TH = 1, TR = 1 -> RLDU = 0011 */
{
return 0x73;
}
case 1: /* start request: TH = 0, TR = 1 -> RLDU = 1111 */
{
return 0x3F;
}
case 2:
case 3: /* ack request: TH=0, TR=0/1 -> RLDU = 0000 */
{
/* TL should match TR */
return ((teamplayer[port].State & 0x20) >> 1);
}
case 4:
case 5:
case 6:
case 7: /* PAD type */
{
unsigned int retval = input.dev[(port << 2) + (counter - 4)];
/* TL should match TR */
return (((teamplayer[port].State & 0x20) >> 1) | retval);
}
default: /* PAD status */
{
unsigned int retval = 0x0F;
/* SEGA teamplayer returns successively PAD1 -> PAD2 -> PAD3 -> PAD4 inputs */
unsigned int padnum = teamplayer[port].Table[counter - 8] >> 4;
/* Each PAD inputs is obtained through 2 or 3 sequential reads: RLDU -> SACB -> MXYZ */
retval &= ~(input.pad[padnum] >> (teamplayer[port].Table[counter - 8] & 0x0F));
/* TL should match TR */
return (((teamplayer[port].State & 0x20) >> 1) | retval);
}
}
}
static inline void teamplayer_write(int port, unsigned char data, unsigned char mask)
{
/* update bits set as output only */
unsigned int state = (teamplayer[port].State & ~mask) | (data & mask);
/* TH & TR handshaking */
if ((teamplayer[port].State ^ state) & 0x60)
{
if (state & 0x40)
{
/* TH high -> reset counter */
teamplayer[port].Counter = 0;
}
else
{
/* increment counter */
teamplayer[port].Counter++;
}
/* update internal state */
teamplayer[port].State = state;
}
}
unsigned char teamplayer_1_read(void)
{
return teamplayer_read(0);
}
unsigned char teamplayer_2_read(void)
{
return teamplayer_read(1);
}
void teamplayer_1_write(unsigned char data, unsigned char mask)
{
teamplayer_write(0, data, mask);
}
void teamplayer_2_write(unsigned char data, unsigned char mask)
{
teamplayer_write(1, data, mask);
}