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Genesis Plus GX 1.6.0 ---------------------- [Core/Sound] --------------- * added YM2413 emulation in Master System compatibility mode. * fixed SN76489 noise boost initialization. * minor YM2612 core optimizations. [Core/VDP] --------------- * added accurate emulation of SG-1000, Master System (315-5124, 315-5246) & Game Gear VDP. * added support for all TMS9918 rendering modes. * improved Mega Drive VDP timings accuracy in Master System Compatibility mode. * fixed color palette initialization. * fixed shifted sprites rendering in Mode 4. * modified pixel rendering support (pixel depth is now forced at compilation time). [Core/CPU] --------------- * optimized 68k core (rewrote 68k interrupt handling, removed multiple CPU types support & unused code) for 5~8% speed improvment [Core/IO] --------------- * added accurate emulation of Master System (315-5216, 315-5237, 315-5297) & Game Gear I/O controllers. * added Terebi Oekaki tablet emulation. * improved Mouse emulation (fixes mouse support in Cannon Fodder). * improved Justifier emulation (fixes gun support in Lethal Enforcers 2). * improved 6-Buttons control pad emulation (fixes Duke Nukem 3D) * modified lightgun emulation to use common key inputs for all devices. * 2-buttons controller is now picked by default for Master System games. [Core/MD] --------------- * added copy-protection hardware emulation for some new dumped games (Tiny Toon Adventures 3, Mighty Morphin Power Rangers & The Battle of Red Cliffs). * added Game Toshokan in EEPROM database (verified on real cartridge). * fixed Micro Machines 2 - Turbo Tournament EEPROM size (verified on real cartridge). * modified SRAM banswitch hardware emulation to be more compatible with some hacks. [Core/MS] --------------- * added Cyborg Z to Korean mapper database. [Core/GG] --------------- * added 93C46 EEPROM emulation (Majors Pro Baseball, World Series Baseball & World Series Baseball 95). [Core/General] --------------- * added support for .mdx ROM format. * added Game Gear & SG-1000 ROM support. * added accurate emulation of SG-1000, Master System (I, II) & Game Gear hardware models for 100% compatibility. * updated to new Genesis Plus license (see http://cgfm2.emuviews.com/) * removed DOS port * various code cleanup. [Gamecube/Wii] --------------- * IMPORTANT: cheats, screenshots & save files are now stored in console-specific directories (ex: /snaps/md, /cheats/ms, /saves/gg, ...) * added 8-bit Action Replay & Game Genie codes support (for Master System & Game Gear games). * improved audio/video synchronization for PAL games in 50Hz TV modes (now use VSYNC like NTSC games in 60hz modes). * improved gun cursor positioning accuracy. * improved horizontal scaling & screenshots rendering in H32 mode. * fixed a bug with ROM file extension handling that would affect cheats, snapshots, sram & savestate files. * removed ARAM/injected ROM support (unused). * removed WPAD_ and PAD_ update from VSYNC callback. * increased GCC inlining limits for some speed improvment. * compiled with devkitPPC r24 & libogc 1.8.7.
262 lines
8.6 KiB
C
262 lines
8.6 KiB
C
/***************************************************************************************
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* Genesis Plus
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* Savestate support
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*
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* Copyright (C) 2007-2011 Eke-Eke (Genesis Plus GX)
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*
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* Redistribution and use of this code or any derivative works are permitted
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* provided that the following conditions are met:
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*
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* - Redistributions may not be sold, nor may they be used in a commercial
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* product or activity.
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*
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* - Redistributions that are modified from the original source must include the
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* complete source code, including the source code for all components used by a
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* binary built from the modified sources. However, as a special exception, the
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* source code distributed need not include anything that is normally distributed
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* (in either source or binary form) with the major components (compiler, kernel,
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* and so on) of the operating system on which the executable runs, unless that
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* component itself accompanies the executable.
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*
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* - Redistributions must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************************/
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#include "shared.h"
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int state_load(unsigned char *buffer)
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{
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/* buffer size */
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int bufferptr = 0;
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/* first allocate state buffer */
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unsigned char *state = (unsigned char *)malloc(STATE_SIZE);
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if (!state) return 0;
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/* uncompress savestate */
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unsigned long inbytes, outbytes;
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memcpy(&inbytes, buffer, 4);
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outbytes = STATE_SIZE;
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uncompress ((Bytef *)state, &outbytes, (Bytef *)(buffer + 4), inbytes);
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/* signature check (GENPLUS-GX x.x.x) */
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char version[17];
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load_param(version,16);
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version[16] = 0;
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if (strncmp(version,STATE_VERSION,11))
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{
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free(state);
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return -1;
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}
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/* version check (1.5.0 and above) */
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if ((version[11] < 0x31) || ((version[11] == 0x31) && (version[13] < 0x35)))
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{
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free(state);
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return -1;
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}
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/* reset system */
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system_reset();
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// GENESIS
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if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
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{
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load_param(work_ram, sizeof(work_ram));
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load_param(zram, sizeof(zram));
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load_param(&zstate, sizeof(zstate));
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load_param(&zbank, sizeof(zbank));
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if (zstate == 3)
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{
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m68k_memory_map[0xa0].read8 = z80_read_byte;
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m68k_memory_map[0xa0].read16 = z80_read_word;
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m68k_memory_map[0xa0].write8 = z80_write_byte;
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m68k_memory_map[0xa0].write16 = z80_write_word;
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}
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else
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{
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m68k_memory_map[0xa0].read8 = m68k_read_bus_8;
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m68k_memory_map[0xa0].read16 = m68k_read_bus_16;
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m68k_memory_map[0xa0].write8 = m68k_unused_8_w;
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m68k_memory_map[0xa0].write16 = m68k_unused_16_w;
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}
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}
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else
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{
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load_param(work_ram, 0x2000);
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}
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/* extended state */
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load_param(&mcycles_68k, sizeof(mcycles_68k));
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load_param(&mcycles_z80, sizeof(mcycles_z80));
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// IO
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if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
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{
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load_param(io_reg, sizeof(io_reg));
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io_reg[0] = region_code | 0x20 | (config.tmss & 1);
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}
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else
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{
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load_param(&io_reg[0x0F], 1);
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}
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// VDP
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bufferptr += vdp_context_load(&state[bufferptr], version);
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// SOUND
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bufferptr += sound_context_load(&state[bufferptr], version);
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// 68000
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if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
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{
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uint16 tmp16;
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uint32 tmp32;
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D0, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D1, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D2, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D3, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D4, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D5, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D6, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D7, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A0, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A1, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A2, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A3, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A4, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A5, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A6, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A7, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_PC, tmp32);
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load_param(&tmp16, 2); m68k_set_reg(M68K_REG_SR, tmp16);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_USP,tmp32);
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}
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// Z80
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load_param(&Z80, sizeof(Z80_Regs));
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Z80.irq_callback = z80_irq_callback;
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// Cartridge HW
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if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
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{
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bufferptr += md_cart_context_load(&state[bufferptr]);
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}
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else
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{
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bufferptr += sms_cart_context_load(&state[bufferptr]);
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}
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free(state);
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return 1;
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}
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int state_save(unsigned char *buffer)
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{
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/* buffer size */
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int bufferptr = 0;
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/* first allocate state buffer */
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unsigned char *state = (unsigned char *)malloc(STATE_SIZE);
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if (!state) return 0;
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/* version string */
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char version[16];
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strncpy(version,STATE_VERSION,16);
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save_param(version, 16);
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// GENESIS
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if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
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{
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save_param(work_ram, sizeof(work_ram));
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save_param(zram, sizeof(zram));
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save_param(&zstate, sizeof(zstate));
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save_param(&zbank, sizeof(zbank));
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}
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else
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{
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save_param(work_ram, 0x2000);
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}
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save_param(&mcycles_68k, sizeof(mcycles_68k));
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save_param(&mcycles_z80, sizeof(mcycles_z80));
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// IO
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if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
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{
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save_param(io_reg, sizeof(io_reg));
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}
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else
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{
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save_param(&io_reg[0x0F], 1);
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}
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// VDP
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bufferptr += vdp_context_save(&state[bufferptr]);
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// SOUND
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bufferptr += sound_context_save(&state[bufferptr]);
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// 68000
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if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
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{
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uint16 tmp16;
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uint32 tmp32;
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tmp32 = m68k_get_reg(M68K_REG_D0); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_D1); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_D2); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_D3); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_D4); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_D5); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_D6); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_D7); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_A0); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_A1); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_A2); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_A3); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_A4); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_A5); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_A6); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_A7); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_PC); save_param(&tmp32, 4);
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tmp16 = m68k_get_reg(M68K_REG_SR); save_param(&tmp16, 2);
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tmp32 = m68k_get_reg(M68K_REG_USP); save_param(&tmp32, 4);
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}
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// Z80
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save_param(&Z80, sizeof(Z80_Regs));
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// Cartridge HW
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if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
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{
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bufferptr += md_cart_context_save(&state[bufferptr]);
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}
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else
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{
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bufferptr += sms_cart_context_save(&state[bufferptr]);
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}
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/* compress state file */
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unsigned long inbytes = bufferptr;
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unsigned long outbytes = STATE_SIZE;
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compress2 ((Bytef *)(buffer + 4), &outbytes, (Bytef *)state, inbytes, 9);
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memcpy(buffer, &outbytes, 4);
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free(state);
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/* return total size */
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return (outbytes + 4);
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}
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