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- // PicoDrive
- // (c) Copyright 2004 Dave, All rights reserved.
- // (c) Copyright 2006-2008, Grazvydas "notaz" Ignotas
- // Free for non-commercial use.
- // For commercial use, separate licencing terms must be obtained.
- #include "PicoInt.h"
- #include "cd/gfx_cd.h"
- extern const unsigned char hcounts_32[];
- extern const unsigned char hcounts_40[];
- #ifndef UTYPES_DEFINED
- typedef unsigned char u8;
- typedef unsigned short u16;
- typedef unsigned int u32;
- #define UTYPES_DEFINED
- #endif
- int (*PicoDmaHook)(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp) = NULL;
- static __inline void AutoIncrement(void)
- {
- Pico.video.addr=(unsigned short)(Pico.video.addr+Pico.video.reg[0xf]);
- }
- static void VideoWrite(u16 d)
- {
- unsigned int a=Pico.video.addr;
- switch (Pico.video.type)
- {
- case 1: if(a&1) d=(u16)((d<<8)|(d>>8)); // If address is odd, bytes are swapped (which game needs this?)
- Pico.vram [(a>>1)&0x7fff]=d;
- if (a - ((unsigned)(Pico.video.reg[5]&0x7f) << 9) < 0x400)
- rendstatus |= PDRAW_DIRTY_SPRITES;
- break;
- case 3: Pico.m.dirtyPal = 1;
- Pico.cram [(a>>1)&0x003f]=d; break; // wraps (Desert Strike)
- case 5: Pico.vsram[(a>>1)&0x003f]=d; break;
- //default:elprintf(EL_ANOMALY, "VDP write %04x with bad type %i", d, Pico.video.type); break;
- }
- AutoIncrement();
- }
- static unsigned int VideoRead(void)
- {
- unsigned int a=0,d=0;
- a=Pico.video.addr; a>>=1;
- switch (Pico.video.type)
- {
- case 0: d=Pico.vram [a&0x7fff]; break;
- case 8: d=Pico.cram [a&0x003f]; break;
- case 4: d=Pico.vsram[a&0x003f]; break;
- default:elprintf(EL_ANOMALY, "VDP read with bad type %i", Pico.video.type); break;
- }
- AutoIncrement();
- return d;
- }
- static int GetDmaLength(void)
- {
- struct PicoVideo *pvid=&Pico.video;
- int len=0;
- // 16-bit words to transfer:
- len =pvid->reg[0x13];
- len|=pvid->reg[0x14]<<8;
- // Charles MacDonald:
- if(!len) len = 0xffff;
- return len;
- }
- static void DmaSlow(int len)
- {
- u16 *pd=0, *pdend, *r;
- unsigned int a=Pico.video.addr, a2, d;
- unsigned char inc=Pico.video.reg[0xf];
- unsigned int source;
- source =Pico.video.reg[0x15]<<1;
- source|=Pico.video.reg[0x16]<<9;
- source|=Pico.video.reg[0x17]<<17;
- elprintf(EL_VDPDMA, "DmaSlow[%i] %06x->%04x len %i inc=%i blank %i [%i] @ %06x",
- Pico.video.type, source, a, len, inc, (Pico.video.status&8)||!(Pico.video.reg[1]&0x40),
- SekCyclesDone(), SekPc);
- Pico.m.dma_xfers += len;
- if ((PicoAHW & PAHW_MCD) && (PicoOpt & POPT_EN_MCD_PSYNC)) SekCyclesBurn(CheckDMA());
- else SekSetCyclesLeftNoMCD(SekCyclesLeftNoMCD - CheckDMA());
- if ((source&0xe00000)==0xe00000) { // Ram
- pd=(u16 *)(Pico.ram+(source&0xfffe));
- pdend=(u16 *)(Pico.ram+0x10000);
- }
- else if (PicoAHW & PAHW_MCD)
- {
- elprintf(EL_VDPDMA, "DmaSlow CD, r3=%02x", Pico_mcd->s68k_regs[3]);
- if(source<0x20000) { // Bios area
- pd=(u16 *)(Pico_mcd->bios+(source&~1));
- pdend=(u16 *)(Pico_mcd->bios+0x20000);
- } else if ((source&0xfc0000)==0x200000) { // Word Ram
- source -= 2;
- if (!(Pico_mcd->s68k_regs[3]&4)) { // 2M mode
- pd=(u16 *)(Pico_mcd->word_ram2M+(source&0x3fffe));
- pdend=(u16 *)(Pico_mcd->word_ram2M+0x40000);
- } else {
- if (source < 0x220000) { // 1M mode
- int bank = Pico_mcd->s68k_regs[3]&1;
- pd=(u16 *)(Pico_mcd->word_ram1M[bank]+(source&0x1fffe));
- pdend=(u16 *)(Pico_mcd->word_ram1M[bank]+0x20000);
- } else {
- DmaSlowCell(source, a, len, inc);
- return;
- }
- }
- } else if ((source&0xfe0000)==0x020000) { // Prg Ram
- u8 *prg_ram = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];
- pd=(u16 *)(prg_ram+(source&0x1fffe));
- pdend=(u16 *)(prg_ram+0x20000);
- } else {
- elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: FIXME: unsupported src", Pico.video.type, source, a);
- return;
- }
- }
- else
- {
- // if we have DmaHook, let it handle ROM because of possible DMA delay
- if (PicoDmaHook && PicoDmaHook(source, len, &pd, &pdend));
- else if (source<Pico.romsize) { // Rom
- pd=(u16 *)(Pico.rom+(source&~1));
- pdend=(u16 *)(Pico.rom+Pico.romsize);
- }
- else {
- elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: invalid src", Pico.video.type, source, a);
- return;
- }
- }
- // overflow protection, might break something..
- if (len > pdend - pd) {
- len = pdend - pd;
- elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow overflow");
- }
- switch (Pico.video.type)
- {
- case 1: // vram
- r = Pico.vram;
- if (inc == 2 && !(a&1) && a+len*2 < 0x10000)
- {
- // most used DMA mode
- memcpy16(r + (a>>1), pd, len);
- a += len*2;
- }
- else
- {
- for(; len; len--)
- {
- d=*pd++;
- if(a&1) d=(d<<8)|(d>>8);
- r[a>>1] = (u16)d; // will drop the upper bits
- // AutoIncrement
- a=(u16)(a+inc);
- // didn't src overlap?
- //if(pd >= pdend) pd-=0x8000; // should be good for RAM, bad for ROM
- }
- }
- rendstatus |= PDRAW_DIRTY_SPRITES;
- break;
- case 3: // cram
- Pico.m.dirtyPal = 1;
- r = Pico.cram;
- for(a2=a&0x7f; len; len--)
- {
- r[a2>>1] = (u16)*pd++; // bit 0 is ignored
- // AutoIncrement
- a2+=inc;
- // didn't src overlap?
- //if(pd >= pdend) pd-=0x8000;
- // good dest?
- if(a2 >= 0x80) break; // Todds Adventures in Slime World / Andre Agassi tennis
- }
- a=(a&0xff00)|a2;
- break;
- case 5: // vsram[a&0x003f]=d;
- r = Pico.vsram;
- for(a2=a&0x7f; len; len--)
- {
- r[a2>>1] = (u16)*pd++;
- // AutoIncrement
- a2+=inc;
- // didn't src overlap?
- //if(pd >= pdend) pd-=0x8000;
- // good dest?
- if(a2 >= 0x80) break;
- }
- a=(a&0xff00)|a2;
- break;
- default:
- elprintf(EL_VDPDMA|EL_ANOMALY, "DMA with bad type %i", Pico.video.type);
- break;
- }
- // remember addr
- Pico.video.addr=(u16)a;
- }
- static void DmaCopy(int len)
- {
- u16 a=Pico.video.addr;
- unsigned char *vr = (unsigned char *) Pico.vram;
- unsigned char *vrs;
- unsigned char inc=Pico.video.reg[0xf];
- int source;
- elprintf(EL_VDPDMA, "DmaCopy len %i [%i]", len, SekCyclesDone());
- Pico.m.dma_xfers += len;
- Pico.video.status |= 2; // dma busy
- source =Pico.video.reg[0x15];
- source|=Pico.video.reg[0x16]<<8;
- vrs=vr+source;
- if (source+len > 0x10000) len=0x10000-source; // clip??
- for (; len; len--)
- {
- vr[a] = *vrs++;
- // AutoIncrement
- a=(u16)(a+inc);
- }
- // remember addr
- Pico.video.addr=a;
- rendstatus |= PDRAW_DIRTY_SPRITES;
- }
- // check: Contra, Megaman
- // note: this is still inaccurate
- static void DmaFill(int data)
- {
- int len;
- unsigned short a=Pico.video.addr;
- unsigned char *vr=(unsigned char *) Pico.vram;
- unsigned char high = (unsigned char) (data >> 8);
- unsigned char inc=Pico.video.reg[0xf];
- len=GetDmaLength();
- elprintf(EL_VDPDMA, "DmaFill len %i inc %i [%i]", len, inc, SekCyclesDone());
- Pico.m.dma_xfers += len;
- Pico.video.status |= 2; // dma busy
- // from Charles MacDonald's genvdp.txt:
- // Write lower byte to address specified
- vr[a] = (unsigned char) data;
- a=(u16)(a+inc);
- if (!inc) len=1;
- for (; len; len--) {
- // Write upper byte to adjacent address
- // (here we are byteswapped, so address is already 'adjacent')
- vr[a] = high;
- // Increment address register
- a=(u16)(a+inc);
- }
- // remember addr
- Pico.video.addr=a;
- // update length
- Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0; // Dino Dini's Soccer (E) (by Haze)
- rendstatus |= PDRAW_DIRTY_SPRITES;
- }
- static void CommandDma(void)
- {
- struct PicoVideo *pvid=&Pico.video;
- int len=0,method=0;
- if ((pvid->reg[1]&0x10)==0) return; // DMA not enabled
- len=GetDmaLength();
- method=pvid->reg[0x17]>>6;
- if (method< 2) DmaSlow(len); // 68000 to VDP
- if (method==3) DmaCopy(len); // VRAM Copy
- }
- static void CommandChange(void)
- {
- struct PicoVideo *pvid=&Pico.video;
- unsigned int cmd=0,addr=0;
- cmd=pvid->command;
- // Get type of transfer 0xc0000030 (v/c/vsram read/write)
- pvid->type=(unsigned char)(((cmd>>2)&0xc)|(cmd>>30));
- // Get address 0x3fff0003
- addr =(cmd>>16)&0x3fff;
- addr|=(cmd<<14)&0xc000;
- pvid->addr=(unsigned short)addr;
- // Check for dma:
- if (cmd&0x80) CommandDma();
- }
- static __inline void DrawSync(int blank_on)
- {
- if (Pico.m.scanline < 224 && !(PicoOpt & POPT_ALT_RENDERER) &&
- !PicoSkipFrame && DrawScanline <= Pico.m.scanline) {
- //elprintf(EL_ANOMALY, "sync");
- PicoDrawSync(Pico.m.scanline, blank_on);
- }
- }
- PICO_INTERNAL_ASM void PicoVideoWrite(unsigned int a,unsigned short d)
- {
- struct PicoVideo *pvid=&Pico.video;
- //if (Pico.m.scanline < 224)
- // elprintf(EL_STATUS, "PicoVideoWrite [%06x] %04x", a, d);
- a&=0x1c;
- if (a==0x00) // Data port 0 or 2
- {
- // try avoiding the sync..
- if (Pico.m.scanline < 224 && (pvid->reg[1]&0x40) &&
- !(!pvid->pending &&
- ((pvid->command & 0xc00000f0) == 0x40000010 && Pico.vsram[pvid->addr>>1] == d))
- )
- DrawSync(0);
- if (pvid->pending) {
- CommandChange();
- pvid->pending=0;
- }
- // If a DMA fill has been set up, do it
- if ((pvid->command&0x80) && (pvid->reg[1]&0x10) && (pvid->reg[0x17]>>6)==2)
- {
- DmaFill(d);
- }
- else
- {
- // preliminary FIFO emulation for Chaos Engine, The (E)
- if (!(pvid->status&8) && (pvid->reg[1]&0x40) && !(PicoOpt&POPT_DIS_VDP_FIFO)) // active display?
- {
- pvid->status&=~0x200; // FIFO no longer empty
- pvid->lwrite_cnt++;
- if (pvid->lwrite_cnt >= 4) pvid->status|=0x100; // FIFO full
- if (pvid->lwrite_cnt > 4) {
- SekCyclesBurn(32); // penalty // 488/12-8
- if (SekCycleCnt>=SekCycleAim) SekEndRun(0);
- }
- elprintf(EL_ASVDP, "VDP data write: %04x [%06x] {%i} #%i @ %06x", d, Pico.video.addr,
- Pico.video.type, pvid->lwrite_cnt, SekPc);
- }
- VideoWrite(d);
- }
- return;
- }
- if (a==0x04) // Control (command) port 4 or 6
- {
- if (pvid->pending)
- {
- if (d & 0x80) DrawSync(0); // only need sync for DMA
- // Low word of command:
- pvid->command&=0xffff0000;
- pvid->command|=d;
- pvid->pending=0;
- CommandChange();
- }
- else
- {
- if ((d&0xc000)==0x8000)
- {
- // Register write:
- int num=(d>>8)&0x1f;
- int dold=pvid->reg[num];
- int blank_on = 0;
- pvid->type=0; // register writes clear command (else no Sega logo in Golden Axe II)
- if (num > 0x0a && !(pvid->reg[1]&4)) {
- elprintf(EL_ANOMALY, "%02x written to reg %02x in SMS mode @ %06x", d, num, SekPc);
- return;
- }
- if (num == 1 && !(d&0x40) && SekCyclesLeft > 390) blank_on = 1;
- DrawSync(blank_on);
- pvid->reg[num]=(unsigned char)d;
- switch (num)
- {
- case 0x00:
- elprintf(EL_INTSW, "hint_onoff: %i->%i [%i] pend=%i @ %06x", (dold&0x10)>>4,
- (d&0x10)>>4, SekCyclesDone(), (pvid->pending_ints&0x10)>>4, SekPc);
- goto update_irq;
- case 0x01:
- elprintf(EL_INTSW, "vint_onoff: %i->%i [%i] pend=%i @ %06x", (dold&0x20)>>5,
- (d&0x20)>>5, SekCyclesDone(), (pvid->pending_ints&0x20)>>5, SekPc);
- goto update_irq;
- case 0x05:
- //elprintf(EL_STATUS, "spritep moved to %04x", (unsigned)(Pico.video.reg[5]&0x7f) << 9);
- if (d^dold) rendstatus |= PDRAW_SPRITES_MOVED;
- break;
- case 0x0c:
- // renderers should update their palettes if sh/hi mode is changed
- if ((d^dold)&8) Pico.m.dirtyPal = 2;
- break;
- }
- return;
- update_irq:
- #ifndef EMU_CORE_DEBUG
- // update IRQ level
- if (!SekShouldInterrupt) // hack
- {
- int lines, pints, irq=0;
- lines = (pvid->reg[1] & 0x20) | (pvid->reg[0] & 0x10);
- pints = (pvid->pending_ints&lines);
- if (pints & 0x20) irq = 6;
- else if (pints & 0x10) irq = 4;
- SekInterrupt(irq); // update line
- if (irq) SekEndRun(24); // make it delayed
- }
- #endif
- }
- else
- {
- // High word of command:
- pvid->command&=0x0000ffff;
- pvid->command|=d<<16;
- pvid->pending=1;
- }
- }
- }
- }
- PICO_INTERNAL_ASM unsigned int PicoVideoRead(unsigned int a)
- {
- a&=0x1c;
- if (a==0x04) // control port
- {
- struct PicoVideo *pv=&Pico.video;
- unsigned int d;
- d=pv->status;
- //if (PicoOpt&POPT_ALT_RENDERER) d|=0x0020; // sprite collision (Shadow of the Beast)
- if (SekCyclesLeft < 84+4) d|=0x0004; // H-Blank (Sonic3 vs)
- d |= ((pv->reg[1]&0x40)^0x40) >> 3; // set V-Blank if display is disabled
- d |= (pv->pending_ints&0x20)<<2; // V-int pending?
- if (d&0x100) pv->status&=~0x100; // FIFO no longer full
- pv->pending = 0; // ctrl port reads clear write-pending flag (Charles MacDonald)
- elprintf(EL_SR, "SR read: %04x @ %06x", d, SekPc);
- return d;
- }
- // H-counter info (based on Generator):
- // frame:
- // | <- hblank? -> |
- // start <416> hint <36> hdisplay <38> end // CPU cycles
- // |---------...---------|------------|-------------|
- // 0 B6 E4 FF // 40 cells
- // 0 93 E8 FF // 32 cells
- // Gens (?) v-render
- // start <hblank=84> hint hdisplay <404> |
- // |---------------------|--------------------------|
- // E4 (hc[0x43]==0) 07 B1 // 40
- // E8 (hc[0x45]==0) 05 91 // 32
- // check: Sonic 3D Blast bonus, Cannon Fodder, Chase HQ II, 3 Ninjas kick back, Road Rash 3, Skitchin', Wheel of Fortune
- if ((a&0x1c)==0x08)
- {
- unsigned int d;
- int lineCycles;
- lineCycles = (488-SekCyclesLeft)&0x1ff;
- if (Pico.video.reg[12]&1)
- d = hcounts_40[lineCycles];
- else d = hcounts_32[lineCycles];
- elprintf(EL_HVCNT, "hv: %02x %02x (%i) @ %06x", d, Pico.video.v_counter, SekCyclesDone(), SekPc);
- return d | (Pico.video.v_counter << 8);
- }
- if (a==0x00) // data port
- {
- return VideoRead();
- }
- return 0;
- }
- unsigned int PicoVideoRead8(unsigned int a)
- {
- unsigned int d;
- a&=0x1d;
- switch (a)
- {
- case 0: return VideoRead() >> 8;
- case 1: return VideoRead() & 0xff;
- case 4: // control port/status reg
- d = Pico.video.status >> 8;
- if (d&1) Pico.video.status&=~0x100; // FIFO no longer full
- Pico.video.pending = 0;
- elprintf(EL_SR, "SR read (h): %02x @ %06x", d, SekPc);
- return d;
- case 5:
- d = Pico.video.status & 0xff;
- //if (PicoOpt&POPT_ALT_RENDERER) d|=0x0020; // sprite collision (Shadow of the Beast)
- d |= ((Pico.video.reg[1]&0x40)^0x40) >> 3; // set V-Blank if display is disabled
- d |= (Pico.video.pending_ints&0x20)<<2; // V-int pending?
- if (SekCyclesLeft < 84+4) d |= 4; // H-Blank
- Pico.video.pending = 0;
- elprintf(EL_SR, "SR read (l): %02x @ %06x", d, SekPc);
- return d;
- case 8: // hv counter
- elprintf(EL_HVCNT, "vcounter: %02x (%i) @ %06x", Pico.video.v_counter, SekCyclesDone(), SekPc);
- return Pico.video.v_counter;
- case 9:
- d = (488-SekCyclesLeft)&0x1ff;
- if (Pico.video.reg[12]&1)
- d = hcounts_40[d];
- else d = hcounts_32[d];
- elprintf(EL_HVCNT, "hcounter: %02x (%i) @ %06x", d, SekCyclesDone(), SekPc);
- return d;
- }
- return 0;
- }
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