mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-09-19 04:39:42 +02:00
2b78421402
------ * improved 68k accuracy (initial reset timing + auto-vectored interrupts handling). * modified Z80 & 68k cores to directly use external cycle count instead of intermediate counters. * improved Z80 & 68k cpu execution/synchronization accuracy, now use Master Clock as common clock reference. * improved PSG & FM chips synchronization with CPU execution (fixed point precision). * completely rewrote sound output processing & mixing: sound chips are now clocked with exact output frame rate to ensure 100% smooth video & audio playback, with no lag or skipping, while still rendering an accurate number of samples per frame. This will also make fast-forward implementation (video AND sound) more trivial. * improved color accuracy in VDP highlight mode to match results observed on real hardware. * improved sprites processing timing accuracy: fixes (un)masked sprites in Mickey Mania (3D level), Sonic 2 (VS mode). * improved horizontal blanking & HINT/VINT occurrence timing accuracy, as measured on real hardware. * improved H-Counter accuracy in 40-cell mode, as measured on real hardware. * optimized Z80 bus status signals * usual code cleanup [GCN/WII] --------- fixed ASNDLIB exit when returning to game fixed audio/video startup sync modified audio back-end engine according to new audio processing core (see above)
198 lines
6.8 KiB
C
198 lines
6.8 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, 2008, 2009 Eke-Eke (GCN/Wii port)
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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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****************************************************************************************/
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#include "shared.h"
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static unsigned char state[STATE_SIZE];
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#define load_param(param, size) \
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memcpy(param, &state[bufferptr], size); \
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bufferptr+= size;
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#define save_param(param, size) \
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memcpy(&state[bufferptr], param, size); \
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bufferptr+= size;
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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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/* 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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/* version check */
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char version[16];
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load_param(version,16);
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if (strncmp(version,STATE_VERSION,16))
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{
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return 0;
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}
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/* reset system */
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system_reset();
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m68k_memory_map[0].base = cart.base;
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// GENESIS
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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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// IO
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load_param(io_reg, sizeof(io_reg));
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// VDP
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uint8 temp_reg[0x20];
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load_param(sat, sizeof(sat));
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load_param(vram, sizeof(vram));
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load_param(cram, sizeof(cram));
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load_param(vsram, sizeof(vsram));
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load_param(temp_reg, sizeof(temp_reg));
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load_param(&addr, sizeof(addr));
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load_param(&addr_latch, sizeof(addr_latch));
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load_param(&code, sizeof(code));
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load_param(&pending, sizeof(pending));
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load_param(&status, sizeof(status));
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load_param(&dmafill, sizeof(dmafill));
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load_param(&hint_pending, sizeof(hint_pending));
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load_param(&vint_pending, sizeof(vint_pending));
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load_param(&irq_status, sizeof(irq_status));
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vdp_restore(temp_reg);
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// FM
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YM2612Restore(&state[bufferptr]);
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bufferptr+= YM2612GetContextSize();
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// PSG
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load_param(SN76489_GetContextPtr(),SN76489_GetContextSize());
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// 68000
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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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// Z80
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load_param(&Z80, sizeof(Z80_Regs));
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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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/* 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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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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// IO
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save_param(io_reg, sizeof(io_reg));
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// VDP
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save_param(sat, sizeof(sat));
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save_param(vram, sizeof(vram));
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save_param(cram, sizeof(cram));
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save_param(vsram, sizeof(vsram));
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save_param(reg, sizeof(reg));
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save_param(&addr, sizeof(addr));
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save_param(&addr_latch, sizeof(addr_latch));
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save_param(&code, sizeof(code));
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save_param(&pending, sizeof(pending));
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save_param(&status, sizeof(status));
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save_param(&dmafill, sizeof(dmafill));
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save_param(&hint_pending, sizeof(hint_pending));
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save_param(&vint_pending, sizeof(vint_pending));
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save_param(&irq_status, sizeof(irq_status));
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// FM
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save_param(YM2612GetContextPtr(),YM2612GetContextSize());
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// PSG
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save_param(SN76489_GetContextPtr(),SN76489_GetContextSize());
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// 68000
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uint16 tmp16;
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uint32 tmp32;
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tmp32 = m68k_get_reg(NULL, M68K_REG_D0); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_D1); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_D2); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_D3); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_D4); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_D5); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_D6); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_D7); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_A0); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_A1); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_A2); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_A3); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_A4); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_A5); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_A6); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_A7); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_PC); save_param(&tmp32, 4);
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tmp16 = m68k_get_reg(NULL, M68K_REG_SR); save_param(&tmp16, 2);
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tmp32 = m68k_get_reg(NULL, M68K_REG_USP); save_param(&tmp32, 4);
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// Z80
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save_param(&Z80, sizeof(Z80_Regs));
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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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/* return total size */
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return (outbytes + 4);
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}
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