mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-11-05 10:25:07 +01:00
a4cfc2a77a
--------------- * improved VBLANK flag accuracy, as observed on real hardware. * improved DMA operations accuracy, writes are now performed on a scanline basis: fixes Gaiares (flickering title screen). * improved DMA Fill timing accuracy. * fixed DMA with bad code values: fixes Williams Arcade Classics (corrupted gfx after soft reset). * fixed horizontal resolution changes during HBLANK: fixes Bugs Bunny in Double Trouble (2nd stage). * fixed Vertical Counter in interlace mode 1, as observed on real hardware. * fixed horizontal border width, as observed on real hardware. * various code improvments & optimizations. [Core/Extra] --------------- * improved savestate format: added DMA, SVP, cartridge mapping & internal registers state informations * improved unlicensed ROM mappers emulation * added Chinese Fighters III mapper support * added Top Fighter mapper support * fixed Barver Battle Saga mapper support * fixed cartridge hardware soft-reset (Game Genie, SVP, ...) * fixed Game Genie registers byte reads
192 lines
6.5 KiB
C
192 lines
6.5 KiB
C
/***************************************************************************************
|
|
* Genesis Plus
|
|
* Savestate support
|
|
*
|
|
* Copyright (C) 2007, 2008, 2009 Eke-Eke (GCN/Wii port)
|
|
*
|
|
* 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"
|
|
|
|
int state_load(unsigned char *buffer)
|
|
{
|
|
/* buffer size */
|
|
int bufferptr = 0;
|
|
|
|
/* first allocate state buffer */
|
|
unsigned char *state = (unsigned char *)malloc(STATE_SIZE);
|
|
if (!state) return 0;
|
|
|
|
/* uncompress savestate */
|
|
unsigned long inbytes, outbytes;
|
|
memcpy(&inbytes, buffer, 4);
|
|
outbytes = STATE_SIZE;
|
|
uncompress ((Bytef *)state, &outbytes, (Bytef *)(buffer + 4), inbytes);
|
|
|
|
/* version check */
|
|
char version[17];
|
|
load_param(version,16);
|
|
version[16] = 0;
|
|
if (strncmp(version,STATE_VERSION,15))
|
|
{
|
|
free(state);
|
|
return -1;
|
|
}
|
|
|
|
/* reset system */
|
|
system_reset();
|
|
|
|
// GENESIS
|
|
load_param(work_ram, sizeof(work_ram));
|
|
load_param(zram, sizeof(zram));
|
|
load_param(&zstate, sizeof(zstate));
|
|
load_param(&zbank, sizeof(zbank));
|
|
if (zstate == 3)
|
|
{
|
|
m68k_memory_map[0xa0].read8 = z80_read_byte;
|
|
m68k_memory_map[0xa0].read16 = z80_read_word;
|
|
m68k_memory_map[0xa0].write8 = z80_write_byte;
|
|
m68k_memory_map[0xa0].write16 = z80_write_word;
|
|
}
|
|
else
|
|
{
|
|
m68k_memory_map[0xa0].read8 = m68k_read_bus_8;
|
|
m68k_memory_map[0xa0].read16 = m68k_read_bus_16;
|
|
m68k_memory_map[0xa0].write8 = m68k_unused_8_w;
|
|
m68k_memory_map[0xa0].write16 = m68k_unused_16_w;
|
|
}
|
|
|
|
if (version[15] > 0x30)
|
|
{
|
|
/* extended state */
|
|
load_param(&mcycles_68k, sizeof(mcycles_68k));
|
|
load_param(&mcycles_z80, sizeof(mcycles_z80));
|
|
}
|
|
|
|
// IO
|
|
load_param(io_reg, sizeof(io_reg));
|
|
|
|
// VDP
|
|
bufferptr += vdp_context_load(&state[bufferptr], version);
|
|
|
|
// SOUND
|
|
bufferptr += sound_context_load(&state[bufferptr], version);
|
|
|
|
// 68000
|
|
uint16 tmp16;
|
|
uint32 tmp32;
|
|
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D0, tmp32);
|
|
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D1, tmp32);
|
|
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D2, tmp32);
|
|
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D3, tmp32);
|
|
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D4, tmp32);
|
|
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D5, tmp32);
|
|
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D6, tmp32);
|
|
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D7, tmp32);
|
|
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A0, tmp32);
|
|
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A1, tmp32);
|
|
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A2, tmp32);
|
|
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A3, tmp32);
|
|
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A4, tmp32);
|
|
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A5, tmp32);
|
|
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A6, tmp32);
|
|
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A7, tmp32);
|
|
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_PC, tmp32);
|
|
load_param(&tmp16, 2); m68k_set_reg(M68K_REG_SR, tmp16);
|
|
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_USP,tmp32);
|
|
|
|
// Z80
|
|
load_param(&Z80, sizeof(Z80_Regs));
|
|
|
|
// Cartridge HW
|
|
bufferptr += cart_hw_context_load(&state[bufferptr], version);
|
|
|
|
free(state);
|
|
return 1;
|
|
}
|
|
|
|
int state_save(unsigned char *buffer)
|
|
{
|
|
/* buffer size */
|
|
int bufferptr = 0;
|
|
|
|
/* first allocate state buffer */
|
|
unsigned char *state = (unsigned char *)malloc(STATE_SIZE);
|
|
if (!state) return 0;
|
|
|
|
/* version string */
|
|
char version[16];
|
|
strncpy(version,STATE_VERSION,16);
|
|
save_param(version, 16);
|
|
|
|
// GENESIS
|
|
save_param(work_ram, sizeof(work_ram));
|
|
save_param(zram, sizeof(zram));
|
|
save_param(&zstate, sizeof(zstate));
|
|
save_param(&zbank, sizeof(zbank));
|
|
save_param(&mcycles_68k, sizeof(mcycles_68k));
|
|
save_param(&mcycles_z80, sizeof(mcycles_z80));
|
|
|
|
// IO
|
|
save_param(io_reg, sizeof(io_reg));
|
|
|
|
// VDP
|
|
bufferptr += vdp_context_save(&state[bufferptr]);
|
|
|
|
// SOUND
|
|
bufferptr += sound_context_save(&state[bufferptr]);
|
|
|
|
// 68000
|
|
uint16 tmp16;
|
|
uint32 tmp32;
|
|
tmp32 = m68k_get_reg(NULL, M68K_REG_D0); save_param(&tmp32, 4);
|
|
tmp32 = m68k_get_reg(NULL, M68K_REG_D1); save_param(&tmp32, 4);
|
|
tmp32 = m68k_get_reg(NULL, M68K_REG_D2); save_param(&tmp32, 4);
|
|
tmp32 = m68k_get_reg(NULL, M68K_REG_D3); save_param(&tmp32, 4);
|
|
tmp32 = m68k_get_reg(NULL, M68K_REG_D4); save_param(&tmp32, 4);
|
|
tmp32 = m68k_get_reg(NULL, M68K_REG_D5); save_param(&tmp32, 4);
|
|
tmp32 = m68k_get_reg(NULL, M68K_REG_D6); save_param(&tmp32, 4);
|
|
tmp32 = m68k_get_reg(NULL, M68K_REG_D7); save_param(&tmp32, 4);
|
|
tmp32 = m68k_get_reg(NULL, M68K_REG_A0); save_param(&tmp32, 4);
|
|
tmp32 = m68k_get_reg(NULL, M68K_REG_A1); save_param(&tmp32, 4);
|
|
tmp32 = m68k_get_reg(NULL, M68K_REG_A2); save_param(&tmp32, 4);
|
|
tmp32 = m68k_get_reg(NULL, M68K_REG_A3); save_param(&tmp32, 4);
|
|
tmp32 = m68k_get_reg(NULL, M68K_REG_A4); save_param(&tmp32, 4);
|
|
tmp32 = m68k_get_reg(NULL, M68K_REG_A5); save_param(&tmp32, 4);
|
|
tmp32 = m68k_get_reg(NULL, M68K_REG_A6); save_param(&tmp32, 4);
|
|
tmp32 = m68k_get_reg(NULL, M68K_REG_A7); save_param(&tmp32, 4);
|
|
tmp32 = m68k_get_reg(NULL, M68K_REG_PC); save_param(&tmp32, 4);
|
|
tmp16 = m68k_get_reg(NULL, M68K_REG_SR); save_param(&tmp16, 2);
|
|
tmp32 = m68k_get_reg(NULL, M68K_REG_USP); save_param(&tmp32, 4);
|
|
|
|
// Z80
|
|
save_param(&Z80, sizeof(Z80_Regs));
|
|
|
|
// Cartridge HW
|
|
bufferptr += cart_hw_context_save(&state[bufferptr]);
|
|
|
|
/* compress state file */
|
|
unsigned long inbytes = bufferptr;
|
|
unsigned long outbytes = STATE_SIZE;
|
|
compress2 ((Bytef *)(buffer + 4), &outbytes, (Bytef *)state, inbytes, 9);
|
|
memcpy(buffer, &outbytes, 4);
|
|
free(state);
|
|
|
|
/* return total size */
|
|
return (outbytes + 4);
|
|
}
|