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- // 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;
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