// PicoDrive // (c) Copyright 2004 Dave, All rights reserved. // (c) Copyright 2006-2008 notaz, All rights reserved. // Free for non-commercial use. // For commercial use, separate licencing terms must be obtained. #include "PicoInt.h" #include "sound/ym2612.h" int PicoVer=0x0133; struct Pico Pico; int PicoOpt = 0; int PicoSkipFrame = 0; // skip rendering frame? int emustatus = 0; // rapid_ym2612, multi_ym_updates int PicoPad[2]; // Joypads, format is MXYZ SACB RLDU int PicoPadInt[2]; // internal copy int PicoAHW = 0; // active addon hardware: scd_active, 32x_active, svp_active, pico_active int PicoRegionOverride = 0; // override the region detection 0: Auto, 1: Japan NTSC, 2: Japan PAL, 4: US, 8: Europe int PicoAutoRgnOrder = 0; struct PicoSRAM SRam = {0,}; void (*PicoWriteSound)(int len) = NULL; // called at the best time to send sound buffer (PsndOut) to hardware void (*PicoResetHook)(void) = NULL; void (*PicoLineHook)(void) = NULL; // to be called once on emu init void PicoInit(void) { // Blank space for state: memset(&Pico,0,sizeof(Pico)); memset(&PicoPad,0,sizeof(PicoPad)); memset(&PicoPadInt,0,sizeof(PicoPadInt)); // Init CPUs: SekInit(); z80_init(); // init even if we aren't going to use it PicoInitMCD(); PicoSVPInit(); SRam.data=0; } // to be called once on emu exit void PicoExit(void) { if (PicoAHW & PAHW_MCD) PicoExitMCD(); PicoCartUnload(); z80_exit(); if (SRam.data) free(SRam.data); SRam.data=0; } void PicoPower(void) { unsigned char sram_reg=Pico.m.sram_reg; // must be preserved Pico.m.frame_count = 0; // clear all memory of the emulated machine memset(&Pico.ram,0,(unsigned int)&Pico.rom-(unsigned int)&Pico.ram); memset(&Pico.video,0,sizeof(Pico.video)); memset(&Pico.m,0,sizeof(Pico.m)); Pico.video.pending_ints=0; z80_reset(); // default VDP register values (based on Fusion) Pico.video.reg[0] = Pico.video.reg[1] = 0x04; Pico.video.reg[0xc] = 0x81; Pico.video.reg[0xf] = 0x02; if (PicoAHW & PAHW_MCD) PicoPowerMCD(); Pico.m.sram_reg=sram_reg; PicoReset(); } PICO_INTERNAL void PicoDetectRegion(void) { int support=0, hw=0, i; unsigned char pal=0; if (PicoRegionOverride) { support = PicoRegionOverride; } else { // Read cartridge region data: int region=PicoRead32(0x1f0); for (i=0;i<4;i++) { int c=0; c=region>>(i<<3); c&=0xff; if (c<=' ') continue; if (c=='J') support|=1; else if (c=='U') support|=4; else if (c=='E') support|=8; else if (c=='j') {support|=1; break; } else if (c=='u') {support|=4; break; } else if (c=='e') {support|=8; break; } else { // New style code: char s[2]={0,0}; s[0]=(char)c; support|=strtol(s,NULL,16); } } } // auto detection order override if (PicoAutoRgnOrder) { if (((PicoAutoRgnOrder>>0)&0xf) & support) support = (PicoAutoRgnOrder>>0)&0xf; else if (((PicoAutoRgnOrder>>4)&0xf) & support) support = (PicoAutoRgnOrder>>4)&0xf; else if (((PicoAutoRgnOrder>>8)&0xf) & support) support = (PicoAutoRgnOrder>>8)&0xf; } // Try to pick the best hardware value for English/50hz: if (support&8) { hw=0xc0; pal=1; } // Europe else if (support&4) hw=0x80; // USA else if (support&2) { hw=0x40; pal=1; } // Japan PAL else if (support&1) hw=0x00; // Japan NTSC else hw=0x80; // USA Pico.m.hardware=(unsigned char)(hw|0x20); // No disk attached Pico.m.pal=pal; } int PicoReset(void) { unsigned char sram_reg=Pico.m.sram_reg; // must be preserved if (Pico.romsize<=0) return 1; /* must call now, so that banking is reset, and correct vectors get fetched */ if (PicoResetHook) PicoResetHook(); PicoMemReset(); SekReset(); memset(&PicoPadInt,0,sizeof(PicoPadInt)); // s68k doesn't have the TAS quirk, so we just globally set normal TAS handler in MCD mode (used by Batman games). SekSetRealTAS(PicoAHW & PAHW_MCD); SekCycleCntT=0; if (PicoAHW & PAHW_MCD) // needed for MCD to reset properly, probably some bug hides behind this.. memset(Pico.ioports,0,sizeof(Pico.ioports)); emustatus = 0; Pico.m.dirtyPal = 1; Pico.m.z80_bank68k = 0; memset(Pico.zram, 0, sizeof(Pico.zram)); // ?? PicoDetectRegion(); Pico.video.status = 0x3428 | Pico.m.pal; // 'always set' bits | vblank | collision | pal PsndReset(); // pal must be known here // create an empty "dma" to cause 68k exec start at random frame location if (Pico.m.dma_xfers == 0 && !(PicoOpt&POPT_DIS_VDP_FIFO)) Pico.m.dma_xfers = rand() & 0x1fff; SekFinishIdleDet(); if (PicoAHW & PAHW_MCD) { PicoResetMCD(); return 0; } // reinit, so that checksum checks pass if (!(PicoOpt & POPT_DIS_IDLE_DET)) SekInitIdleDet(); // reset sram state; enable sram access by default if it doesn't overlap with ROM Pico.m.sram_reg=sram_reg&0x14; if (!(Pico.m.sram_reg&4) && Pico.romsize <= SRam.start) Pico.m.sram_reg |= 1; elprintf(EL_STATUS, "sram: det: %i; eeprom: %i; start: %06x; end: %06x", (Pico.m.sram_reg>>4)&1, (Pico.m.sram_reg>>2)&1, SRam.start, SRam.end); return 0; } // dma2vram settings are just hacks to unglitch Legend of Galahad (needs <= 104 to work) // same for Outrunners (92-121, when active is set to 24) // 96 is VR hack static const int dma_timings[] = { 96, 167, 166, 83, // vblank: 32cell: dma2vram dma2[vs|c]ram vram_fill vram_copy 102, 205, 204, 102, // vblank: 40cell: 16, 16, 15, 8, // active: 32cell: 24, 18, 17, 9 // ... }; static const int dma_bsycles[] = { (488<<8)/96, (488<<8)/167, (488<<8)/166, (488<<8)/83, (488<<8)/102, (488<<8)/205, (488<<8)/204, (488<<8)/102, (488<<8)/16, (488<<8)/16, (488<<8)/15, (488<<8)/8, (488<<8)/24, (488<<8)/18, (488<<8)/17, (488<<8)/9 }; PICO_INTERNAL int CheckDMA(void) { int burn = 0, xfers_can, dma_op = Pico.video.reg[0x17]>>6; // see gens for 00 and 01 modes int xfers = Pico.m.dma_xfers; int dma_op1; if(!(dma_op&2)) dma_op = (Pico.video.type==1) ? 0 : 1; // setting dma_timings offset here according to Gens dma_op1 = dma_op; if(Pico.video.reg[12] & 1) dma_op |= 4; // 40 cell mode? if(!(Pico.video.status&8)&&(Pico.video.reg[1]&0x40)) dma_op|=8; // active display? xfers_can = dma_timings[dma_op]; if(xfers <= xfers_can) { if(dma_op&2) Pico.video.status&=~2; // dma no longer busy else { burn = xfers * dma_bsycles[dma_op] >> 8; // have to be approximate because can't afford division.. } Pico.m.dma_xfers = 0; } else { if(!(dma_op&2)) burn = 488; Pico.m.dma_xfers -= xfers_can; } elprintf(EL_VDPDMA, "~Dma %i op=%i can=%i burn=%i [%i]", Pico.m.dma_xfers, dma_op1, xfers_can, burn, SekCyclesDone()); //dprintf("~aim: %i, cnt: %i", SekCycleAim, SekCycleCnt); return burn; } static __inline void SekRunM68k(int cyc) { int cyc_do; SekCycleAim+=cyc; if ((cyc_do=SekCycleAim-SekCycleCnt) <= 0) return; #if defined(EMU_CORE_DEBUG) // this means we do run-compare SekCycleCnt+=CM_compareRun(cyc_do, 0); #elif defined(EMU_C68K) PicoCpuCM68k.cycles=cyc_do; CycloneRun(&PicoCpuCM68k); SekCycleCnt+=cyc_do-PicoCpuCM68k.cycles; #elif defined(EMU_M68K) SekCycleCnt+=m68k_execute(cyc_do); #elif defined(EMU_F68K) SekCycleCnt+=fm68k_emulate(cyc_do+1, 0, 0); #endif } // to be called on 224 or line_sample scanlines only static __inline void getSamples(int y) { #if SIMPLE_WRITE_SOUND if (y != 224) return; PsndRender(0, PsndLen); if (PicoWriteSound) PicoWriteSound(PsndLen); PsndClear(); #else static int curr_pos = 0; if(y == 224) { if(emustatus & 2) curr_pos += PsndRender(curr_pos, PsndLen-PsndLen/2); else curr_pos = PsndRender(0, PsndLen); if (emustatus&1) emustatus|=2; else emustatus&=~2; if (PicoWriteSound) PicoWriteSound(curr_pos); // clear sound buffer PsndClear(); } else if(emustatus & 3) { emustatus|= 2; emustatus&=~1; curr_pos = PsndRender(0, PsndLen/2); } #endif } #include "PicoFrameHints.c" int z80stopCycle; int z80_cycle_cnt; /* 'done' z80 cycles before z80_run() */ int z80_cycle_aim; int z80_scanline; int z80_scanline_cycles; /* cycles done until z80_scanline */ /* sync z80 to 68k */ PICO_INTERNAL void PicoSyncZ80(int m68k_cycles_done) { int cnt; z80_cycle_aim = cycles_68k_to_z80(m68k_cycles_done); cnt = z80_cycle_aim - z80_cycle_cnt; elprintf(EL_BUSREQ, "z80 sync %i (%i|%i -> %i|%i)", cnt, z80_cycle_cnt, z80_cycle_cnt / 228, z80_cycle_aim, z80_cycle_aim / 228); if (cnt > 0) z80_cycle_cnt += z80_run(cnt); } void PicoFrame(void) { Pico.m.frame_count++; #if 0 if ((Pico.m.frame_count & 0x3f) == 0) { extern int idlehit_addrs[], idlehit_counts[]; int i; printf("--\n"); for (i = 0; i < 128 && idlehit_addrs[i] != 0; i++) { if (idlehit_counts[i] != 0) { printf("%06x %i %i\n", idlehit_addrs[i], idlehit_counts[i], idlehit_counts[i] >> 6); idlehit_counts[i] = 0; } } } #endif if (PicoAHW & PAHW_MCD) { PicoFrameMCD(); return; } //if(Pico.video.reg[12]&0x2) Pico.video.status ^= 0x10; // change odd bit in interlace mode if (!(PicoOpt&POPT_ALT_RENDERER)) PicoFrameStart(); PicoFrameHints(); } void PicoFrameDrawOnly(void) { PicoFrameStart(); PicoDrawSync(223, 0); } void PicoGetInternal(pint_t which, pint_ret_t *r) { switch (which) { case PI_ROM: r->vptr = Pico.rom; break; case PI_ISPAL: r->vint = Pico.m.pal; break; case PI_IS40_CELL: r->vint = Pico.video.reg[12]&1; break; case PI_IS240_LINES: r->vint = Pico.m.pal && (Pico.video.reg[1]&8); break; } } // callback to output message from emu void (*PicoMessage)(const char *msg)=NULL;