mirror of
https://github.com/RaySollium99/picodrive.git
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356 lines
9.1 KiB
C
356 lines
9.1 KiB
C
/*
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* PicoDrive
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* (c) Copyright Dave, 2004
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* (C) notaz, 2006-2010
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*
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* This work is licensed under the terms of MAME license.
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* See COPYING file in the top-level directory.
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*/
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#include "pico_int.h"
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#include "sound/ym2612.h"
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struct Pico Pico;
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int PicoOpt;
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int PicoSkipFrame; // skip rendering frame?
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int PicoPad[2]; // Joypads, format is MXYZ SACB RLDU
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int PicoPadInt[2]; // internal copy
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int PicoAHW; // active addon hardware: PAHW_*
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int PicoRegionOverride; // override the region detection 0: Auto, 1: Japan NTSC, 2: Japan PAL, 4: US, 8: Europe
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int PicoAutoRgnOrder;
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struct PicoSRAM SRam;
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int emustatus; // rapid_ym2612, multi_ym_updates
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int scanlines_total;
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void (*PicoWriteSound)(int len) = NULL; // called at the best time to send sound buffer (PsndOut) to hardware
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void (*PicoResetHook)(void) = NULL;
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void (*PicoLineHook)(void) = NULL;
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// to be called once on emu init
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void PicoInit(void)
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{
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// Blank space for state:
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memset(&Pico,0,sizeof(Pico));
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memset(&PicoPad,0,sizeof(PicoPad));
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memset(&PicoPadInt,0,sizeof(PicoPadInt));
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// Init CPUs:
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SekInit();
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z80_init(); // init even if we aren't going to use it
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PicoInitMCD();
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PicoSVPInit();
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Pico32xInit();
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}
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// to be called once on emu exit
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void PicoExit(void)
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{
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if (PicoAHW & PAHW_MCD)
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PicoExitMCD();
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PicoCartUnload();
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z80_exit();
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if (SRam.data)
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free(SRam.data);
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pevt_dump();
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}
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void PicoPower(void)
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{
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Pico.m.frame_count = 0;
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// clear all memory of the emulated machine
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memset(&Pico.ram,0,(unsigned char *)&Pico.rom - Pico.ram);
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memset(&Pico.video,0,sizeof(Pico.video));
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memset(&Pico.m,0,sizeof(Pico.m));
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Pico.video.pending_ints=0;
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z80_reset();
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// default VDP register values (based on Fusion)
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Pico.video.reg[0] = Pico.video.reg[1] = 0x04;
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Pico.video.reg[0xc] = 0x81;
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Pico.video.reg[0xf] = 0x02;
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if (PicoAHW & PAHW_MCD)
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PicoPowerMCD();
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if (PicoOpt & POPT_EN_32X)
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PicoPower32x();
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PicoReset();
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}
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PICO_INTERNAL void PicoDetectRegion(void)
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{
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int support=0, hw=0, i;
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unsigned char pal=0;
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if (PicoRegionOverride)
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{
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support = PicoRegionOverride;
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}
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else
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{
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// Read cartridge region data:
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unsigned short *rd = (unsigned short *)(Pico.rom + 0x1f0);
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int region = (rd[0] << 16) | rd[1];
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for (i = 0; i < 4; i++)
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{
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int c;
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c = region >> (i<<3);
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c &= 0xff;
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if (c <= ' ') continue;
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if (c=='J') support|=1;
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else if (c=='U') support|=4;
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else if (c=='E') support|=8;
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else if (c=='j') {support|=1; break; }
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else if (c=='u') {support|=4; break; }
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else if (c=='e') {support|=8; break; }
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else
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{
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// New style code:
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char s[2]={0,0};
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s[0]=(char)c;
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support|=strtol(s,NULL,16);
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}
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}
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}
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// auto detection order override
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if (PicoAutoRgnOrder) {
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if (((PicoAutoRgnOrder>>0)&0xf) & support) support = (PicoAutoRgnOrder>>0)&0xf;
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else if (((PicoAutoRgnOrder>>4)&0xf) & support) support = (PicoAutoRgnOrder>>4)&0xf;
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else if (((PicoAutoRgnOrder>>8)&0xf) & support) support = (PicoAutoRgnOrder>>8)&0xf;
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}
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// Try to pick the best hardware value for English/50hz:
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if (support&8) { hw=0xc0; pal=1; } // Europe
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else if (support&4) hw=0x80; // USA
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else if (support&2) { hw=0x40; pal=1; } // Japan PAL
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else if (support&1) hw=0x00; // Japan NTSC
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else hw=0x80; // USA
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Pico.m.hardware=(unsigned char)(hw|0x20); // No disk attached
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Pico.m.pal=pal;
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}
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int PicoReset(void)
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{
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if (Pico.romsize <= 0)
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return 1;
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#ifdef DRC_CMP
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PicoOpt |= POPT_DIS_VDP_FIFO|POPT_DIS_IDLE_DET;
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#endif
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/* must call now, so that banking is reset, and correct vectors get fetched */
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if (PicoResetHook)
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PicoResetHook();
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memset(&PicoPadInt,0,sizeof(PicoPadInt));
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emustatus = 0;
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if (PicoAHW & PAHW_SMS) {
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PicoResetMS();
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return 0;
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}
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SekReset();
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// s68k doesn't have the TAS quirk, so we just globally set normal TAS handler in MCD mode (used by Batman games).
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SekSetRealTAS(PicoAHW & PAHW_MCD);
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SekCycleCntT=0;
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if (PicoAHW & PAHW_MCD)
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// needed for MCD to reset properly, probably some bug hides behind this..
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memset(Pico.ioports,0,sizeof(Pico.ioports));
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Pico.m.dirtyPal = 1;
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Pico.m.z80_bank68k = 0;
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Pico.m.z80_reset = 1;
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memset(Pico.zram, 0, sizeof(Pico.zram)); // ??
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PicoDetectRegion();
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Pico.video.status = 0x3428 | Pico.m.pal; // 'always set' bits | vblank | collision | pal
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PsndReset(); // pal must be known here
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// create an empty "dma" to cause 68k exec start at random frame location
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if (Pico.m.dma_xfers == 0 && !(PicoOpt & POPT_DIS_VDP_FIFO))
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Pico.m.dma_xfers = rand() & 0x1fff;
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SekFinishIdleDet();
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if (PicoAHW & PAHW_MCD) {
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PicoResetMCD();
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return 0;
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}
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// reinit, so that checksum checks pass
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if (!(PicoOpt & POPT_DIS_IDLE_DET))
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SekInitIdleDet();
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if (PicoOpt & POPT_EN_32X)
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PicoReset32x();
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// reset sram state; enable sram access by default if it doesn't overlap with ROM
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Pico.m.sram_reg = 0;
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if ((SRam.flags & SRF_EEPROM) || Pico.romsize <= SRam.start)
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Pico.m.sram_reg |= SRR_MAPPED;
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if (SRam.flags & SRF_ENABLED)
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elprintf(EL_STATUS, "sram: %06x - %06x; eeprom: %i", SRam.start, SRam.end,
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!!(SRam.flags & SRF_EEPROM));
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return 0;
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}
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// flush config changes before emu loop starts
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void PicoLoopPrepare(void)
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{
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if (PicoRegionOverride)
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// force setting possibly changed..
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Pico.m.pal = (PicoRegionOverride == 2 || PicoRegionOverride == 8) ? 1 : 0;
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// FIXME: PAL has 313 scanlines..
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scanlines_total = Pico.m.pal ? 312 : 262;
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Pico.m.dirtyPal = 1;
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rendstatus_old = -1;
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}
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// dma2vram settings are just hacks to unglitch Legend of Galahad (needs <= 104 to work)
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// same for Outrunners (92-121, when active is set to 24)
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// 96 is VR hack
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static const int dma_timings[] = {
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96, 167, 166, 83, // vblank: 32cell: dma2vram dma2[vs|c]ram vram_fill vram_copy
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102, 205, 204, 102, // vblank: 40cell:
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16, 16, 15, 8, // active: 32cell:
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24, 18, 17, 9 // ...
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};
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static const int dma_bsycles[] = {
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(488<<8)/96, (488<<8)/167, (488<<8)/166, (488<<8)/83,
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(488<<8)/102, (488<<8)/205, (488<<8)/204, (488<<8)/102,
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(488<<8)/16, (488<<8)/16, (488<<8)/15, (488<<8)/8,
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(488<<8)/24, (488<<8)/18, (488<<8)/17, (488<<8)/9
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};
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PICO_INTERNAL int CheckDMA(void)
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{
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int burn = 0, xfers_can, dma_op = Pico.video.reg[0x17]>>6; // see gens for 00 and 01 modes
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int xfers = Pico.m.dma_xfers;
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int dma_op1;
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if(!(dma_op&2)) dma_op = (Pico.video.type==1) ? 0 : 1; // setting dma_timings offset here according to Gens
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dma_op1 = dma_op;
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if(Pico.video.reg[12] & 1) dma_op |= 4; // 40 cell mode?
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if(!(Pico.video.status&8)&&(Pico.video.reg[1]&0x40)) dma_op|=8; // active display?
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xfers_can = dma_timings[dma_op];
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if(xfers <= xfers_can)
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{
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if(dma_op&2) Pico.video.status&=~2; // dma no longer busy
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else {
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burn = xfers * dma_bsycles[dma_op] >> 8; // have to be approximate because can't afford division..
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}
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Pico.m.dma_xfers = 0;
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} else {
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if(!(dma_op&2)) burn = 488;
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Pico.m.dma_xfers -= xfers_can;
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}
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elprintf(EL_VDPDMA, "~Dma %i op=%i can=%i burn=%i [%i]", Pico.m.dma_xfers, dma_op1, xfers_can, burn, SekCyclesDone());
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//dprintf("~aim: %i, cnt: %i", SekCycleAim, SekCycleCnt);
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return burn;
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}
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#include "pico_cmn.c"
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int z80stopCycle;
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int z80_cycle_cnt; /* 'done' z80 cycles before z80_run() */
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int z80_cycle_aim;
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int z80_scanline;
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int z80_scanline_cycles; /* cycles done until z80_scanline */
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/* sync z80 to 68k */
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PICO_INTERNAL void PicoSyncZ80(int m68k_cycles_done)
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{
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int cnt;
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z80_cycle_aim = cycles_68k_to_z80(m68k_cycles_done);
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cnt = z80_cycle_aim - z80_cycle_cnt;
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pprof_start(z80);
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elprintf(EL_BUSREQ, "z80 sync %i (%i|%i -> %i|%i)", cnt, z80_cycle_cnt, z80_cycle_cnt / 228,
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z80_cycle_aim, z80_cycle_aim / 228);
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if (cnt > 0)
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z80_cycle_cnt += z80_run(cnt);
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pprof_end(z80);
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}
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void PicoFrame(void)
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{
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pprof_start(frame);
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Pico.m.frame_count++;
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if (PicoAHW & PAHW_SMS) {
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PicoFrameMS();
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goto end;
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}
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// TODO: MCD+32X
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if (PicoAHW & PAHW_MCD) {
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PicoFrameMCD();
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goto end;
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}
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if (PicoAHW & PAHW_32X) {
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PicoFrame32x();
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goto end;
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}
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//if(Pico.video.reg[12]&0x2) Pico.video.status ^= 0x10; // change odd bit in interlace mode
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PicoFrameStart();
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PicoFrameHints();
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end:
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pprof_end(frame);
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}
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void PicoFrameDrawOnly(void)
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{
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if (!(PicoAHW & PAHW_SMS)) {
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PicoFrameStart();
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PicoDrawSync(223, 0);
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} else {
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PicoFrameDrawOnlyMS();
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}
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}
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void PicoGetInternal(pint_t which, pint_ret_t *r)
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{
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switch (which)
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{
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case PI_ROM: r->vptr = Pico.rom; break;
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case PI_ISPAL: r->vint = Pico.m.pal; break;
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case PI_IS40_CELL: r->vint = Pico.video.reg[12]&1; break;
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case PI_IS240_LINES: r->vint = Pico.m.pal && (Pico.video.reg[1]&8); break;
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}
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}
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// callback to output message from emu
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void (*PicoMessage)(const char *msg)=NULL;
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