+++ /dev/null
-// PicoDrive\r
-\r
-// (c) Copyright 2004 Dave, All rights reserved.\r
-// (c) Copyright 2006-2008 notaz, All rights reserved.\r
-// Free for non-commercial use.\r
-\r
-// For commercial use, separate licencing terms must be obtained.\r
-\r
-\r
-#include "PicoInt.h"\r
-#include "sound/ym2612.h"\r
-\r
-int PicoVer=0x0133;\r
-struct Pico Pico;\r
-int PicoOpt = 0;\r
-int PicoSkipFrame = 0; // skip rendering frame?\r
-int emustatus = 0; // rapid_ym2612, multi_ym_updates\r
-int PicoPad[2]; // Joypads, format is MXYZ SACB RLDU\r
-int PicoPadInt[2]; // internal copy\r
-int PicoAHW = 0; // active addon hardware: scd_active, 32x_active, svp_active, pico_active\r
-int PicoRegionOverride = 0; // override the region detection 0: Auto, 1: Japan NTSC, 2: Japan PAL, 4: US, 8: Europe\r
-int PicoAutoRgnOrder = 0;\r
-struct PicoSRAM SRam = {0,};\r
-\r
-void (*PicoWriteSound)(int len) = NULL; // called at the best time to send sound buffer (PsndOut) to hardware\r
-void (*PicoResetHook)(void) = NULL;\r
-void (*PicoLineHook)(void) = NULL;\r
-\r
-// to be called once on emu init\r
-void PicoInit(void)\r
-{\r
- // Blank space for state:\r
- memset(&Pico,0,sizeof(Pico));\r
- memset(&PicoPad,0,sizeof(PicoPad));\r
- memset(&PicoPadInt,0,sizeof(PicoPadInt));\r
-\r
- // Init CPUs:\r
- SekInit();\r
- z80_init(); // init even if we aren't going to use it\r
-\r
- PicoInitMCD();\r
- PicoSVPInit();\r
-\r
- SRam.data=0;\r
-}\r
-\r
-// to be called once on emu exit\r
-void PicoExit(void)\r
-{\r
- if (PicoAHW & PAHW_MCD)\r
- PicoExitMCD();\r
- PicoCartUnload();\r
- z80_exit();\r
-\r
- if (SRam.data) free(SRam.data); SRam.data=0;\r
-}\r
-\r
-void PicoPower(void)\r
-{\r
- unsigned char sram_reg=Pico.m.sram_reg; // must be preserved\r
-\r
- Pico.m.frame_count = 0;\r
-\r
- // clear all memory of the emulated machine\r
- memset(&Pico.ram,0,(unsigned int)&Pico.rom-(unsigned int)&Pico.ram);\r
-\r
- memset(&Pico.video,0,sizeof(Pico.video));\r
- memset(&Pico.m,0,sizeof(Pico.m));\r
-\r
- Pico.video.pending_ints=0;\r
- z80_reset();\r
-\r
- // default VDP register values (based on Fusion)\r
- Pico.video.reg[0] = Pico.video.reg[1] = 0x04;\r
- Pico.video.reg[0xc] = 0x81;\r
- Pico.video.reg[0xf] = 0x02;\r
-\r
- if (PicoAHW & PAHW_MCD)\r
- PicoPowerMCD();\r
-\r
- Pico.m.sram_reg=sram_reg;\r
- PicoReset();\r
-}\r
-\r
-PICO_INTERNAL void PicoDetectRegion(void)\r
-{\r
- int support=0, hw=0, i;\r
- unsigned char pal=0;\r
-\r
- if (PicoRegionOverride)\r
- {\r
- support = PicoRegionOverride;\r
- }\r
- else\r
- {\r
- // Read cartridge region data:\r
- int region=PicoRead32(0x1f0);\r
-\r
- for (i=0;i<4;i++)\r
- {\r
- int c=0;\r
-\r
- c=region>>(i<<3); c&=0xff;\r
- if (c<=' ') continue;\r
-\r
- if (c=='J') support|=1;\r
- else if (c=='U') support|=4;\r
- else if (c=='E') support|=8;\r
- else if (c=='j') {support|=1; break; }\r
- else if (c=='u') {support|=4; break; }\r
- else if (c=='e') {support|=8; break; }\r
- else\r
- {\r
- // New style code:\r
- char s[2]={0,0};\r
- s[0]=(char)c;\r
- support|=strtol(s,NULL,16);\r
- }\r
- }\r
- }\r
-\r
- // auto detection order override\r
- if (PicoAutoRgnOrder) {\r
- if (((PicoAutoRgnOrder>>0)&0xf) & support) support = (PicoAutoRgnOrder>>0)&0xf;\r
- else if (((PicoAutoRgnOrder>>4)&0xf) & support) support = (PicoAutoRgnOrder>>4)&0xf;\r
- else if (((PicoAutoRgnOrder>>8)&0xf) & support) support = (PicoAutoRgnOrder>>8)&0xf;\r
- }\r
-\r
- // Try to pick the best hardware value for English/50hz:\r
- if (support&8) { hw=0xc0; pal=1; } // Europe\r
- else if (support&4) hw=0x80; // USA\r
- else if (support&2) { hw=0x40; pal=1; } // Japan PAL\r
- else if (support&1) hw=0x00; // Japan NTSC\r
- else hw=0x80; // USA\r
-\r
- Pico.m.hardware=(unsigned char)(hw|0x20); // No disk attached\r
- Pico.m.pal=pal;\r
-}\r
-\r
-int PicoReset(void)\r
-{\r
- unsigned char sram_reg=Pico.m.sram_reg; // must be preserved\r
-\r
- if (Pico.romsize<=0) return 1;\r
-\r
- /* must call now, so that banking is reset, and correct vectors get fetched */\r
- if (PicoResetHook) PicoResetHook();\r
-\r
- PicoMemReset();\r
- SekReset();\r
- memset(&PicoPadInt,0,sizeof(PicoPadInt));\r
- // s68k doesn't have the TAS quirk, so we just globally set normal TAS handler in MCD mode (used by Batman games).\r
- SekSetRealTAS(PicoAHW & PAHW_MCD);\r
- SekCycleCntT=0;\r
-\r
- if (PicoAHW & PAHW_MCD)\r
- // needed for MCD to reset properly, probably some bug hides behind this..\r
- memset(Pico.ioports,0,sizeof(Pico.ioports));\r
- emustatus = 0;\r
-\r
- Pico.m.dirtyPal = 1;\r
-\r
- Pico.m.z80_bank68k = 0;\r
- memset(Pico.zram, 0, sizeof(Pico.zram)); // ??\r
-\r
- PicoDetectRegion();\r
- Pico.video.status = 0x3428 | Pico.m.pal; // 'always set' bits | vblank | collision | pal\r
-\r
- PsndReset(); // pal must be known here\r
-\r
- // create an empty "dma" to cause 68k exec start at random frame location\r
- if (Pico.m.dma_xfers == 0 && !(PicoOpt&POPT_DIS_VDP_FIFO))\r
- Pico.m.dma_xfers = rand() & 0x1fff;\r
-\r
- SekFinishIdleDet();\r
-\r
- if (PicoAHW & PAHW_MCD) {\r
- PicoResetMCD();\r
- return 0;\r
- }\r
-\r
- // reinit, so that checksum checks pass\r
- if (!(PicoOpt & POPT_DIS_IDLE_DET))\r
- SekInitIdleDet();\r
-\r
- // reset sram state; enable sram access by default if it doesn't overlap with ROM\r
- Pico.m.sram_reg=sram_reg&0x14;\r
- if (!(Pico.m.sram_reg&4) && Pico.romsize <= SRam.start) Pico.m.sram_reg |= 1;\r
-\r
- elprintf(EL_STATUS, "sram: det: %i; eeprom: %i; start: %06x; end: %06x",\r
- (Pico.m.sram_reg>>4)&1, (Pico.m.sram_reg>>2)&1, SRam.start, SRam.end);\r
-\r
- return 0;\r
-}\r
-\r
-\r
-// dma2vram settings are just hacks to unglitch Legend of Galahad (needs <= 104 to work)\r
-// same for Outrunners (92-121, when active is set to 24)\r
-// 96 is VR hack\r
-static const int dma_timings[] = {\r
- 96, 167, 166, 83, // vblank: 32cell: dma2vram dma2[vs|c]ram vram_fill vram_copy\r
- 102, 205, 204, 102, // vblank: 40cell:\r
- 16, 16, 15, 8, // active: 32cell:\r
- 24, 18, 17, 9 // ...\r
-};\r
-\r
-static const int dma_bsycles[] = {\r
- (488<<8)/96, (488<<8)/167, (488<<8)/166, (488<<8)/83,\r
- (488<<8)/102, (488<<8)/205, (488<<8)/204, (488<<8)/102,\r
- (488<<8)/16, (488<<8)/16, (488<<8)/15, (488<<8)/8,\r
- (488<<8)/24, (488<<8)/18, (488<<8)/17, (488<<8)/9\r
-};\r
-\r
-PICO_INTERNAL int CheckDMA(void)\r
-{\r
- int burn = 0, xfers_can, dma_op = Pico.video.reg[0x17]>>6; // see gens for 00 and 01 modes\r
- int xfers = Pico.m.dma_xfers;\r
- int dma_op1;\r
-\r
- if(!(dma_op&2)) dma_op = (Pico.video.type==1) ? 0 : 1; // setting dma_timings offset here according to Gens\r
- dma_op1 = dma_op;\r
- if(Pico.video.reg[12] & 1) dma_op |= 4; // 40 cell mode?\r
- if(!(Pico.video.status&8)&&(Pico.video.reg[1]&0x40)) dma_op|=8; // active display?\r
- xfers_can = dma_timings[dma_op];\r
- if(xfers <= xfers_can)\r
- {\r
- if(dma_op&2) Pico.video.status&=~2; // dma no longer busy\r
- else {\r
- burn = xfers * dma_bsycles[dma_op] >> 8; // have to be approximate because can't afford division..\r
- }\r
- Pico.m.dma_xfers = 0;\r
- } else {\r
- if(!(dma_op&2)) burn = 488;\r
- Pico.m.dma_xfers -= xfers_can;\r
- }\r
-\r
- elprintf(EL_VDPDMA, "~Dma %i op=%i can=%i burn=%i [%i]", Pico.m.dma_xfers, dma_op1, xfers_can, burn, SekCyclesDone());\r
- //dprintf("~aim: %i, cnt: %i", SekCycleAim, SekCycleCnt);\r
- return burn;\r
-}\r
-\r
-static __inline void SekRunM68k(int cyc)\r
-{\r
- int cyc_do;\r
- SekCycleAim+=cyc;\r
- if ((cyc_do=SekCycleAim-SekCycleCnt) <= 0) return;\r
-#if defined(EMU_CORE_DEBUG)\r
- // this means we do run-compare\r
- SekCycleCnt+=CM_compareRun(cyc_do, 0);\r
-#elif defined(EMU_C68K)\r
- PicoCpuCM68k.cycles=cyc_do;\r
- CycloneRun(&PicoCpuCM68k);\r
- SekCycleCnt+=cyc_do-PicoCpuCM68k.cycles;\r
-#elif defined(EMU_M68K)\r
- SekCycleCnt+=m68k_execute(cyc_do);\r
-#elif defined(EMU_F68K)\r
- SekCycleCnt+=fm68k_emulate(cyc_do+1, 0, 0);\r
-#endif\r
-}\r
-\r
-\r
-// to be called on 224 or line_sample scanlines only\r
-static __inline void getSamples(int y)\r
-{\r
-#if SIMPLE_WRITE_SOUND\r
- if (y != 224) return;\r
- PsndRender(0, PsndLen);\r
- if (PicoWriteSound) PicoWriteSound(PsndLen);\r
- PsndClear();\r
-#else\r
- static int curr_pos = 0;\r
-\r
- if(y == 224) {\r
- if(emustatus & 2)\r
- curr_pos += PsndRender(curr_pos, PsndLen-PsndLen/2);\r
- else curr_pos = PsndRender(0, PsndLen);\r
- if (emustatus&1) emustatus|=2; else emustatus&=~2;\r
- if (PicoWriteSound) PicoWriteSound(curr_pos);\r
- // clear sound buffer\r
- PsndClear();\r
- }\r
- else if(emustatus & 3) {\r
- emustatus|= 2;\r
- emustatus&=~1;\r
- curr_pos = PsndRender(0, PsndLen/2);\r
- }\r
-#endif\r
-}\r
-\r
-\r
-#include "PicoFrameHints.c"\r
-\r
-\r
-int z80stopCycle;\r
-int z80_cycle_cnt; /* 'done' z80 cycles before z80_run() */\r
-int z80_cycle_aim;\r
-int z80_scanline;\r
-int z80_scanline_cycles; /* cycles done until z80_scanline */\r
-\r
-/* sync z80 to 68k */\r
-PICO_INTERNAL void PicoSyncZ80(int m68k_cycles_done)\r
-{\r
- int cnt;\r
- z80_cycle_aim = cycles_68k_to_z80(m68k_cycles_done);\r
- cnt = z80_cycle_aim - z80_cycle_cnt;\r
-\r
- elprintf(EL_BUSREQ, "z80 sync %i (%i|%i -> %i|%i)", cnt, z80_cycle_cnt, z80_cycle_cnt / 228,\r
- z80_cycle_aim, z80_cycle_aim / 228);\r
-\r
- if (cnt > 0)\r
- z80_cycle_cnt += z80_run(cnt);\r
-}\r
-\r
-\r
-void PicoFrame(void)\r
-{\r
- Pico.m.frame_count++;\r
-\r
-#if 0\r
- if ((Pico.m.frame_count & 0x3f) == 0)\r
- {\r
- extern int idlehit_addrs[], idlehit_counts[];\r
- int i;\r
- printf("--\n");\r
- for (i = 0; i < 128 && idlehit_addrs[i] != 0; i++) {\r
- if (idlehit_counts[i] != 0) {\r
- printf("%06x %i %i\n", idlehit_addrs[i], idlehit_counts[i], idlehit_counts[i] >> 6);\r
- idlehit_counts[i] = 0;\r
- }\r
- }\r
- }\r
-#endif\r
-\r
- if (PicoAHW & PAHW_MCD) {\r
- PicoFrameMCD();\r
- return;\r
- }\r
-\r
- //if(Pico.video.reg[12]&0x2) Pico.video.status ^= 0x10; // change odd bit in interlace mode\r
-\r
- if (!(PicoOpt&POPT_ALT_RENDERER))\r
- PicoFrameStart();\r
-\r
- PicoFrameHints();\r
-}\r
-\r
-void PicoFrameDrawOnly(void)\r
-{\r
- PicoFrameStart();\r
- PicoDrawSync(223, 0);\r
-}\r
-\r
-void PicoGetInternal(pint_t which, pint_ret_t *r)\r
-{\r
- switch (which)\r
- {\r
- case PI_ROM: r->vptr = Pico.rom; break;\r
- case PI_ISPAL: r->vint = Pico.m.pal; break;\r
- case PI_IS40_CELL: r->vint = Pico.video.reg[12]&1; break;\r
- case PI_IS240_LINES: r->vint = Pico.m.pal && (Pico.video.reg[1]&8); break;\r
- }\r
-}\r
-\r
-// callback to output message from emu\r
-void (*PicoMessage)(const char *msg)=NULL;\r
-\r
notaz.gp2x.de / picodrive.git / blobdiff