X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;ds=sidebyside;f=Pico%2FPico.c;fp=Pico%2FPico.c;h=0000000000000000000000000000000000000000;hb=efcba75f8a730340df6c1b679a207723f98d1ee6;hp=296d5d5281a30218a33b7d4b5c628c1bee704071;hpb=6a13ef3f56a80ac698d463f5d00235ea2a090f52;p=picodrive.git diff --git a/Pico/Pico.c b/Pico/Pico.c deleted file mode 100644 index 296d5d5..0000000 --- a/Pico/Pico.c +++ /dev/null @@ -1,366 +0,0 @@ -// 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; -