mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-12-27 03:31:49 +01:00
+added Game Genie hardware emulation (Game Genie ROM is now fully supported)
This commit is contained in:
ekeeke31
parent
c8c71b9bff
commit
d112fb72a2
26
HISTORY.txt
26
HISTORY.txt
@ -1,22 +1,24 @@
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---------------------------------------------------------------------------------------------------------
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Genesis Plus GX 1.3.2 (??/??/????) (Eke-Eke)
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Genesis Plus GX 1.4.0 (??/??/????) (Eke-Eke)
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---------------------------------------------------------------------------------------------------------
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[Core]
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------
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* optimized SN76489 core
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* modified SN76489 cut-off frequency (thanks to Steve Snake)
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* modified SN76489 core to use Blip Buffer linear synthesis , Noise channel is now linear averaged (thanks to Blargg)
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* modified SN76489 cut-off frequency
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* implemented optimized SN76489 core from Blargg that uses Blip Buffer linear synthesis (Noise Channel is now linear interpolated)
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* added an option to boost SN76489 Noise Channel
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* removed now outdated Gens YM2612 core
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* improved YM2612 emulation accuracy (SSG-EG, CSM mode...) (thanks to Nemesis for his tests on real hardware)
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* removed outdated Gens YM2612 core
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* improved YM2612 core general accuracy (SSG-EG, CSM mode,...) (based upon Nemesis recent tests on real MD)
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* improved YM2612 LFO emulation (fixes "Spider-Man & Venom : Separation Anxiety" intro music)
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* fixed YM2612 context saving/loading.
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* added 3 Band Equalizer for improved & fully configurable sound filtering (taken from Softdev's NeoCD Redux)
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* improved sprites masking emulation: fixes 3D level in Mickey Mania (thanks to Nemesis for his test program)
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* added 3-Band EQ for fully configurable sound filtering (credits to Neil C / Etanza Systems)
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* implemented faster and better FIR resampler, removed libsamplerate support (thanks to Blargg and AamirM), Virtua Racing now plays fullspeed
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when High Quality FM is enabled.
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* improved VDP sprite masking emulation: fixes 3D level in Mickey Mania (thanks to Nemesis for his sprite test program)
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* fixed lightgun autodetection: fixes cursor position in Lethal Enforcers II
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* improved DIVU/DVIS (thanks to Jorge Cwik) & MULU/MULS instructions timing accuracy
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* lots of code cleanup & core optimizations
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* improved DIVU/DVIS (thanks to Jorge Cwik) & MULU/MULS 68k instructions timing accuracy
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* various code cleanup & core optimizations
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[Gamecube/Wii]
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@ -24,8 +26,8 @@ Genesis Plus GX 1.3.2 (??/??/????) (Eke-Eke)
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* fixed stability issues and some (potential) memory leaks
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* added internal screenshot feature
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* improved lightgun cursors
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* new FONT & GUI engines: use internal IPL FONT, GX hardware & multithreading for fast rendering.
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* new interface: incl. IR pointing, ROM snapshots, menu effects, sound effects, BGM... (check the README for more details)
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* implemented new FONT & GUI engines: use internal IPL FONT, GX hardware & multithreading for fast rendering.
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* implemented new interface: incl. IR pointing, ROM snapshots, menu effects, sound effects, BGM... (check the README for more details)
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@ -151,6 +151,9 @@ void cart_hw_reset()
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/* SVP chip */
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if (svp) svp_reset();
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/* Game Genie hardware */
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if (config.lock_on == CART_GG) ggenie_reset();
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}
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/* cart hardware detection */
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@ -222,6 +225,11 @@ void cart_hw_init()
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}
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}
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/**********************************************
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GAME GENIE
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***********************************************/
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if (config.lock_on == CART_GG) ggenie_init();
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/**********************************************
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SVP CHIP
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***********************************************/
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@ -27,6 +27,12 @@
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#ifndef _CART_HW_H_
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#define _CART_HW_H_
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/* Lock-ON cartridge devices */
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#define NO_CART 0 /* no connections */
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#define CART_GG 1 /* game genie */
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#define CART_AR 2 /* action replay */
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#define CART_SK 3 /* Sonic & Knuckles */
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/* Hardware description */
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typedef struct
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{
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217
source/cart_hw/ggenie.c
Normal file
217
source/cart_hw/ggenie.c
Normal file
@ -0,0 +1,217 @@
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/****************************************************************************
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* Genesis Plus
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* Game Genie Hardware emulation
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*
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* Copyright (C) 2009 Eke-Eke (GCN/Wii port)
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*
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* Based on documentation from Charles McDonald
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* (http://cgfm2.emuviews.com/txt/genie.txt)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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***************************************************************************/
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#include "shared.h"
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static struct
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{
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uint8 enabled;
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uint8 rom[0x10000];
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uint16 regs[0x20];
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uint16 old[6];
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uint16 data[6];
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uint32 addr[6];
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} ggenie;
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static void ggenie_write_byte(uint32 address, uint32 data);
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static void ggenie_write_word(uint32 address, uint32 data);
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static void ggenie_write_regs(uint8 offset, uint32 data, uint8 type);
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static uint32 ggenie_read_regs(uint32 address);
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void ggenie_init(void)
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{
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memset(&ggenie,0,sizeof(ggenie));
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/* load Game Genie ROM program */
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FILE *f = fopen(GAMEGENIE_ROM,"rb");
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if (!f) return;
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fread(ggenie.rom,1,0x8000,f);
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fclose(f);
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/* $0000-$7fff mirrored into $8000-$ffff */
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memcpy(ggenie.rom+0x8000,ggenie.rom,0x8000);
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#ifdef LSB_FIRST
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/* Byteswap ROM */
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int i;
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uint8 temp;
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for(i = 0; i < 0x10000; i += 2)
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{
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temp = ggenie.rom[i];
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ggenie.rom[i] = ggenie.rom[i+1];
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ggenie.rom[i+1] = temp;
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}
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#endif
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/* set flag */
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ggenie.enabled = 1;
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}
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void ggenie_reset(void)
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{
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if (!ggenie.enabled) return;
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/* restore patched ROM */
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int i;
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for (i=0; i<6; i++)
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{
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if (ggenie.regs[0] & (1 << i))
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*(uint16 *)(cart_rom + ggenie.addr[i]) = ggenie.old[i];
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}
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/* reset internal state */
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memset(ggenie.regs,0,sizeof(ggenie.regs));
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memset(ggenie.old,0,sizeof(ggenie.old));
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memset(ggenie.data,0,sizeof(ggenie.data));
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memset(ggenie.addr,0,sizeof(ggenie.addr));
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/* default slot mapping */
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/* reads are mapped to Game Genie ROM */
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/* writes are mapped to Game Genie internal registers */
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m68k_memory_map[0].base = ggenie.rom;
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m68k_memory_map[0].write8 = ggenie_write_byte;
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m68k_memory_map[0].write16 = ggenie_write_word;
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m68k_memory_map[0].read16 = NULL;
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}
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/* Byte write handler */
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/* Note: 2nd revision of the Game Genie software use byte writes to set registe values on exit */
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static void ggenie_write_byte(uint32 address, uint32 data)
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{
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/* Lock bit */
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if (ggenie.regs[0] & 0x100) return;
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/* Register offset */
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uint8 offset = (address >> 1) & 0x1f;
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/* Write internal register (lower or upper BYTE) */
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ggenie_write_regs(offset,data,address & 1);
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}
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/* Word write handler */
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static void ggenie_write_word(uint32 address, uint32 data)
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{
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/* Lock bit */
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if (ggenie.regs[0] & 0x100) return;
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/* Register offset */
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uint8 offset = (address >> 1) & 0x1f;
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/* Write internal register (full WORD) */
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ggenie_write_regs(offset,data,2);
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}
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static void ggenie_write_regs(uint8 offset, uint32 data, uint8 type)
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{
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/* access type */
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switch (type)
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{
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case 0: /* upper byte write */
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data = (ggenie.regs[offset] & 0x00ff) | ((data & 0xff) << 8);
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break;
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case 1: /* lower byte write */
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data = (ggenie.regs[offset] & 0xff00) | (data & 0xff);
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break;
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default:
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break;
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}
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/* Mode Register */
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if (!offset)
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{
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/* by default, registers are write only */
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m68k_memory_map[0].read16 = NULL;
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/* MODE bits */
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if (data & 0x400)
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{
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/* $0000-$7ffff reads mapped to Cartridge ROM */
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m68k_memory_map[0].base = cart_rom;
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}
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else
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{
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/* $0000-$7ffff reads mapped to Game Genie ROM */
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m68k_memory_map[0].base = ggenie.rom;
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if (data & 0x200)
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{
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/* $0000-$7ffff reads mapped to Game Genie Registers */
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/* code doing this should execute in RAM so we don't need to modify base address */
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m68k_memory_map[0].read16 = ggenie_read_regs;
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}
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}
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/* LOCK bit */
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if ((data & 0x100) && !(ggenie.regs[0] & 0x100))
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{
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/* patch ROM when GG program exits (LOCK bit set) */
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/* this is done here to handle patched program reads faster & more easily */
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/* on real HW, address decoding would be done on each reads */
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int i,j;
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for (i=0; i<6; i++)
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{
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/* decode patch address */
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/* note: Charles's documment is wrong, first register holds bits 23-16 of patch address */
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ggenie.addr[i] = (ggenie.regs[2+3*i] << 16) | ggenie.regs[3+3*i];
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/* decode patch data */
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ggenie.data[i] = ggenie.regs[4+3*i];
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/* patch is enabled ? */
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if (data & (1 << i))
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{
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/* first look if address has not already been patched */
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for (j=0;j<i;j++)
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{
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if (ggenie.addr[i] == ggenie.addr[j])
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{
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/* disable code for later initialization */
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data &= ~(1 << i);
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}
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}
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/* ave old value and patch ROM if enabled */
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if (data & (1 << i))
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{
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ggenie.old[i] = *(uint16 *)(cart_rom + ggenie.addr[i]);
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*(uint16 *)(cart_rom + ggenie.addr[i]) = ggenie.data[i];
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}
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}
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}
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}
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}
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/* update internal register */
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ggenie.regs[offset] = data;
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}
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static uint32 ggenie_read_regs(uint32 address)
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{
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if (address < 0x40) return ggenie.regs[address >> 1];
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else return *(uint16 *)(cart_rom + address);
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}
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30
source/cart_hw/ggenie.h
Normal file
30
source/cart_hw/ggenie.h
Normal file
@ -0,0 +1,30 @@
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/****************************************************************************
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* Genesis Plus
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* Game Genie Hardware emulation
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*
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* Copyright (C) 2009 Eke-Eke (GCN/Wii port)
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*
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* Based on documentation from Charles McDonald
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* (http://cgfm2.emuviews.com/txt/genie.txt)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
|
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* the Free Software Foundation; either version 2 of the License, or
|
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
|
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
|
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*
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* You should have received a copy of the GNU General Public License
|
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* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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***************************************************************************/
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/* global variables */
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extern int gamegenie;
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/* Function prototypes */
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extern void ggenie_init(void);
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extern void ggenie_reset(void);
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@ -80,6 +80,7 @@ void config_default(void)
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config.force_dtack = 0;
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config.addr_error = 1;
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config.bios_enabled = 0;
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config.lock_on = NO_CART;
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/* video options */
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config.xshift = 0;
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@ -43,6 +43,7 @@ typedef struct
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uint8 force_dtack;
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uint8 addr_error;
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uint8 bios_enabled;
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uint8 lock_on;
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int16 xshift;
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int16 yshift;
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int16 xscale;
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@ -230,12 +230,13 @@ static gui_item items_audio[8] =
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};
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/* System options menu */
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static gui_item items_system[5] =
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static gui_item items_system[6] =
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{
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{NULL,NULL,"Console Region: AUTO", "Select system region", 52,132,276,48},
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{NULL,NULL,"System Lockups: OFF", "Enable/disable original system lock-ups", 52,132,276,48},
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{NULL,NULL,"68k Address Error: ON", "Enable/disable 68k Address Error", 52,132,276,48},
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{NULL,NULL,"System BIOS: OFF", "Enable/disable TMSS BIOS support", 52,132,276,48},
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{NULL,NULL,"Lock-on: OFF", "Select Lock-On cartridge type", 52,132,276,48},
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{NULL,NULL,"SVP Cycles: 1500", "Adjust SVP chip emulation speed", 52,132,276,48}
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};
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@ -410,7 +411,7 @@ static gui_menu menu_system =
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{
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"System Settings",
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0,0,
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5,4,6,
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6,4,6,
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items_system,
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buttons_list,
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bg_list,
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@ -833,16 +834,18 @@ static void systemmenu ()
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sprintf (items[1].text, "System Lockups: %s", config.force_dtack ? "OFF" : "ON");
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sprintf (items[2].text, "68k Address Error: %s", config.addr_error ? "ON" : "OFF");
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sprintf (items[3].text, "System BIOS: %s", (config.bios_enabled & 1) ? "ON":"OFF");
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if (config.lock_on == CART_GG) sprintf (items[4].text, "Lock-On: GAME GENIE");
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else sprintf (items[4].text, "Lock-On: OFF");
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if (svp)
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{
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sprintf (items[4].text, "SVP Cycles: %d", SVP_cycles);
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m->max_items = 5;
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sprintf (items[5].text, "SVP Cycles: %d", SVP_cycles);
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m->max_items = 6;
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}
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else
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{
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m->max_items = 4;
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m->offset = 0;
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m->max_items = 5;
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if (m->offset > 1) m->offset =1;
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}
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GUI_InitMenu(m);
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@ -909,7 +912,13 @@ static void systemmenu ()
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}
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break;
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case 4: /*** SVP emulation ***/
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case 4: /*** Cart Lock-On ***/
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config.lock_on++;
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if (config.lock_on > CART_GG) config.lock_on = NO_CART;
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if (config.lock_on == CART_GG) sprintf (items[4].text, "Lock-On: GAME GENIE");
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else sprintf (items[4].text, "Lock-On: OFF");
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case 5: /*** SVP emulation ***/
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GUI_OptionBox(m,0,"SVP Cycles",(void *)&SVP_cycles,1,1,1500,1);
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sprintf (items[4].text, "SVP Cycles: %d", SVP_cycles);
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break;
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@ -54,14 +54,11 @@ static void Power_Off(void)
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***************************************************************************/
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static void load_bios(void)
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{
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char pathname[MAXPATHLEN];
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/* reset BIOS found flag */
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config.bios_enabled &= ~2;
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/* open BIOS file */
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sprintf (pathname, "%s/BIOS.bin",DEFAULT_PATH);
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FILE *fp = fopen(pathname, "rb");
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FILE *fp = fopen(BIOS_ROM, "rb");
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if (fp == NULL) return;
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/* read file */
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@ -25,7 +25,10 @@
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#include "config.h"
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#include "file_mem.h"
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#define DEFAULT_PATH "/genplus"
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#define DEFAULT_PATH "/genplus"
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#define GAMEGENIE_ROM "/genplus/ggenie.bin"
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#define BIOS_ROM "/genplus/bios.bin"
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#ifdef HW_RVL
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#define VERSION "version 1.3.2cW"
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#else
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@ -26,6 +26,7 @@
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#include "cart_hw.h"
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#include "eeprom.h"
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#include "sram.h"
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#include "ggenie.h"
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#include "svp.h"
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#include "osd.h"
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|
||||
@ -1909,7 +1909,8 @@ void YM2612Update(int length)
|
||||
{
|
||||
int i;
|
||||
int lt,rt;
|
||||
int16 *bufL,*bufR;
|
||||
int16 *bufL = 0;
|
||||
int16 *bufR = 0;
|
||||
|
||||
/* Output samples buffers */
|
||||
int16 *bufFIR = Fir_Resampler_buffer();
|
||||
|
||||
@ -220,7 +220,7 @@ void system_init (void)
|
||||
****************************************************************/
|
||||
void system_reset (void)
|
||||
{
|
||||
/* Cartridge Hardware */
|
||||
/* Cartridge Hardware (should be done first !) */
|
||||
cart_hw_reset();
|
||||
|
||||
/* Genesis Hardware */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user