[picodrive.git] / Pico / VideoPort.c

// This is part of Pico Library\r
\r
// (c) Copyright 2004 Dave, All rights reserved.\r
// (c) Copyright 2006-2007, Grazvydas "notaz" Ignotas\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 "cd/gfx_cd.h"\r
\r
extern const unsigned char  hcounts_32[];\r
extern const unsigned char  hcounts_40[];\r
extern const unsigned short vcounts[];\r
\r
#ifndef UTYPES_DEFINED\r
typedef unsigned char  u8;\r
typedef unsigned short u16;\r
typedef unsigned int   u32;\r
#define UTYPES_DEFINED\r
#endif\r
\r
int (*PicoDmaHook)(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp) = NULL;\r
\r
static __inline void AutoIncrement(void)\r
{\r
  Pico.video.addr=(unsigned short)(Pico.video.addr+Pico.video.reg[0xf]);\r
}\r
\r
static void VideoWrite(u16 d)\r
{\r
  unsigned int a=Pico.video.addr;\r
\r
  switch (Pico.video.type)\r
  {\r
    case 1: if(a&1) d=(u16)((d<<8)|(d>>8)); // If address is odd, bytes are swapped (which game needs this?)\r
            Pico.vram [(a>>1)&0x7fff]=d;\r
            rendstatus |= PDRAW_DIRTY_SPRITES; break;\r
    case 3: Pico.m.dirtyPal = 1;\r
            Pico.cram [(a>>1)&0x003f]=d; break; // wraps (Desert Strike)\r
    case 5: Pico.vsram[(a>>1)&0x003f]=d; break;\r
    //default:elprintf(EL_ANOMALY, "VDP write %04x with bad type %i", d, Pico.video.type); break;\r
  }\r
\r
  //dprintf("w[%i] @ %04x, inc=%i [%i|%i]", Pico.video.type, a, Pico.video.reg[0xf], Pico.m.scanline, SekCyclesDone());\r
  AutoIncrement();\r
}\r
\r
static unsigned int VideoRead(void)\r
{\r
  unsigned int a=0,d=0;\r
\r
  a=Pico.video.addr; a>>=1;\r
\r
  switch (Pico.video.type)\r
  {\r
    case 0: d=Pico.vram [a&0x7fff]; break;\r
    case 8: d=Pico.cram [a&0x003f]; break;\r
    case 4: d=Pico.vsram[a&0x003f]; break;\r
    default:elprintf(EL_ANOMALY, "VDP read with bad type %i", Pico.video.type); break;\r
  }\r
\r
  AutoIncrement();\r
  return d;\r
}\r
\r
static int GetDmaLength(void)\r
{\r
  struct PicoVideo *pvid=&Pico.video;\r
  int len=0;\r
  // 16-bit words to transfer:\r
  len =pvid->reg[0x13];\r
  len|=pvid->reg[0x14]<<8;\r
  // Charles MacDonald:\r
  if(!len) len = 0xffff;\r
  return len;\r
}\r
\r
static void DmaSlow(int len)\r
{\r
  u16 *pd=0, *pdend, *r;\r
  unsigned int a=Pico.video.addr, a2, d;\r
  unsigned char inc=Pico.video.reg[0xf];\r
  unsigned int source;\r
\r
  source =Pico.video.reg[0x15]<<1;\r
  source|=Pico.video.reg[0x16]<<9;\r
  source|=Pico.video.reg[0x17]<<17;\r
\r
  elprintf(EL_VDPDMA, "DmaSlow[%i] %06x->%04x len %i inc=%i blank %i [%i] @ %06x",\r
    Pico.video.type, source, a, len, inc, (Pico.video.status&8)||!(Pico.video.reg[1]&0x40),\r
    SekCyclesDone(), SekPc);\r
\r
  if (Pico.m.scanline != -1) {\r
    Pico.m.dma_xfers += len;\r
    if ((PicoAHW & PAHW_MCD) && (PicoOpt & POPT_EN_MCD_PSYNC)) SekCyclesBurn(CheckDMA());\r
    else SekSetCyclesLeftNoMCD(SekCyclesLeftNoMCD - CheckDMA());\r
  } else {\r
    // be approximate in non-accurate mode\r
    SekSetCyclesLeft(SekCyclesLeft - (len*(((488<<8)/167))>>8));\r
  }\r
\r
  if ((source&0xe00000)==0xe00000) { // Ram\r
    pd=(u16 *)(Pico.ram+(source&0xfffe));\r
    pdend=(u16 *)(Pico.ram+0x10000);\r
  }\r
  else if (PicoAHW & PAHW_MCD)\r
  {\r
    elprintf(EL_VDPDMA, "DmaSlow CD, r3=%02x", Pico_mcd->s68k_regs[3]);\r
    if(source<0x20000) { // Bios area\r
      pd=(u16 *)(Pico_mcd->bios+(source&~1));\r
      pdend=(u16 *)(Pico_mcd->bios+0x20000);\r
    } else if ((source&0xfc0000)==0x200000) { // Word Ram\r
      source -= 2;\r
      if (!(Pico_mcd->s68k_regs[3]&4)) { // 2M mode\r
        pd=(u16 *)(Pico_mcd->word_ram2M+(source&0x3fffe));\r
        pdend=(u16 *)(Pico_mcd->word_ram2M+0x40000);\r
      } else {\r
        if (source < 0x220000) { // 1M mode\r
          int bank = Pico_mcd->s68k_regs[3]&1;\r
          pd=(u16 *)(Pico_mcd->word_ram1M[bank]+(source&0x1fffe));\r
          pdend=(u16 *)(Pico_mcd->word_ram1M[bank]+0x20000);\r
        } else {\r
          DmaSlowCell(source, a, len, inc);\r
          return;\r
        }\r
      }\r
    } else if ((source&0xfe0000)==0x020000) { // Prg Ram\r
      u8 *prg_ram = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];\r
      pd=(u16 *)(prg_ram+(source&0x1fffe));\r
      pdend=(u16 *)(prg_ram+0x20000);\r
    } else {\r
      elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: FIXME: unsupported src", Pico.video.type, source, a);\r
      return;\r
    }\r
  }\r
  else\r
  {\r
    // if we have DmaHook, let it handle ROM because of possible DMA delay\r
    if (PicoDmaHook && PicoDmaHook(source, len, &pd, &pdend));\r
    else if (source<Pico.romsize) { // Rom\r
      pd=(u16 *)(Pico.rom+(source&~1));\r
      pdend=(u16 *)(Pico.rom+Pico.romsize);\r
    }\r
    else {\r
      elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: invalid src", Pico.video.type, source, a);\r
      return;\r
    }\r
  }\r
\r
  // overflow protection, might break something..\r
  if (len > pdend - pd) {\r
    len = pdend - pd;\r
    elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow overflow");\r
  }\r
\r
  switch (Pico.video.type)\r
  {\r
    case 1: // vram\r
      r = Pico.vram;\r
      if (inc == 2 && !(a&1) && a+len*2 < 0x10000)\r
      {\r
        // most used DMA mode\r
        memcpy16(r + (a>>1), pd, len);\r
        a += len*2;\r
      }\r
      else\r
      {\r
        for(; len; len--)\r
        {\r
          d=*pd++;\r
          if(a&1) d=(d<<8)|(d>>8);\r
          r[a>>1] = (u16)d; // will drop the upper bits\r
          // AutoIncrement\r
          a=(u16)(a+inc);\r
          // didn't src overlap?\r
          //if(pd >= pdend) pd-=0x8000; // should be good for RAM, bad for ROM\r
        }\r
      }\r
      rendstatus |= PDRAW_DIRTY_SPRITES;\r
      break;\r
\r
    case 3: // cram\r
      Pico.m.dirtyPal = 1;\r
      r = Pico.cram;\r
      for(a2=a&0x7f; len; len--)\r
      {\r
        r[a2>>1] = (u16)*pd++; // bit 0 is ignored\r
        // AutoIncrement\r
        a2+=inc;\r
        // didn't src overlap?\r
        //if(pd >= pdend) pd-=0x8000;\r
        // good dest?\r
        if(a2 >= 0x80) break; // Todds Adventures in Slime World / Andre Agassi tennis\r
      }\r
      a=(a&0xff00)|a2;\r
      break;\r
\r
    case 5: // vsram[a&0x003f]=d;\r
      r = Pico.vsram;\r
      for(a2=a&0x7f; len; len--)\r
      {\r
        r[a2>>1] = (u16)*pd++;\r
        // AutoIncrement\r
        a2+=inc;\r
        // didn't src overlap?\r
        //if(pd >= pdend) pd-=0x8000;\r
        // good dest?\r
        if(a2 >= 0x80) break;\r
      }\r
      a=(a&0xff00)|a2;\r
      break;\r
\r
    default:\r
      elprintf(EL_VDPDMA|EL_ANOMALY, "DMA with bad type %i", Pico.video.type);\r
      break;\r
  }\r
  // remember addr\r
  Pico.video.addr=(u16)a;\r
}\r
\r
static void DmaCopy(int len)\r
{\r
  u16 a=Pico.video.addr;\r
  unsigned char *vr = (unsigned char *) Pico.vram;\r
  unsigned char *vrs;\r
  unsigned char inc=Pico.video.reg[0xf];\r
  int source;\r
  elprintf(EL_VDPDMA, "DmaCopy len %i [%i]", len, SekCyclesDone());\r
\r
  Pico.m.dma_xfers += len;\r
  if(Pico.m.scanline != -1)\r
    Pico.video.status|=2; // dma busy\r
\r
  source =Pico.video.reg[0x15];\r
  source|=Pico.video.reg[0x16]<<8;\r
  vrs=vr+source;\r
\r
  if(source+len > 0x10000) len=0x10000-source; // clip??\r
\r
  for(;len;len--)\r
  {\r
    vr[a] = *vrs++;\r
    // AutoIncrement\r
    a=(u16)(a+inc);\r
  }\r
  // remember addr\r
  Pico.video.addr=a;\r
  rendstatus |= PDRAW_DIRTY_SPRITES;\r
}\r
\r
// check: Contra, Megaman\r
// note: this is still inaccurate\r
static void DmaFill(int data)\r
{\r
  int len;\r
  unsigned short a=Pico.video.addr;\r
  unsigned char *vr=(unsigned char *) Pico.vram;\r
  unsigned char high = (unsigned char) (data >> 8);\r
  unsigned char inc=Pico.video.reg[0xf];\r
\r
  len=GetDmaLength();\r
  elprintf(EL_VDPDMA, "DmaFill len %i inc %i [%i]", len, inc, SekCyclesDone());\r
\r
  Pico.m.dma_xfers += len;\r
  if(Pico.m.scanline != -1)\r
    Pico.video.status|=2; // dma busy (in accurate mode)\r
\r
  // from Charles MacDonald's genvdp.txt:\r
  // Write lower byte to address specified\r
  vr[a] = (unsigned char) data;\r
  a=(u16)(a+inc);\r
\r
  if(!inc) len=1;\r
\r
  for(;len;len--) {\r
    // Write upper byte to adjacent address\r
    // (here we are byteswapped, so address is already 'adjacent')\r
    vr[a] = high;\r
\r
    // Increment address register\r
    a=(u16)(a+inc);\r
  }\r
  // remember addr\r
  Pico.video.addr=a;\r
  // update length\r
  Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0; // Dino Dini's Soccer (E) (by Haze)\r
\r
  rendstatus |= PDRAW_DIRTY_SPRITES;\r
}\r
\r
static void CommandDma(void)\r
{\r
  struct PicoVideo *pvid=&Pico.video;\r
  int len=0,method=0;\r
\r
  if ((pvid->reg[1]&0x10)==0) return; // DMA not enabled\r
\r
  len=GetDmaLength();\r
\r
  method=pvid->reg[0x17]>>6;\r
  if (method< 2) DmaSlow(len); // 68000 to VDP\r
  if (method==3) DmaCopy(len); // VRAM Copy\r
}\r
\r
static void CommandChange(void)\r
{\r
  struct PicoVideo *pvid=&Pico.video;\r
  unsigned int cmd=0,addr=0;\r
\r
  cmd=pvid->command;\r
\r
  // Get type of transfer 0xc0000030 (v/c/vsram read/write)\r
  pvid->type=(unsigned char)(((cmd>>2)&0xc)|(cmd>>30));\r
\r
  // Get address 0x3fff0003\r
  addr =(cmd>>16)&0x3fff;\r
  addr|=(cmd<<14)&0xc000;\r
  pvid->addr=(unsigned short)addr;\r
\r
  // Check for dma:\r
  if (cmd&0x80) CommandDma();\r
}\r
\r
PICO_INTERNAL_ASM void PicoVideoWrite(unsigned int a,unsigned short d)\r
{\r
  struct PicoVideo *pvid=&Pico.video;\r
\r
  a&=0x1c;\r
\r
  if (a==0x00) // Data port 0 or 2\r
  {\r
    if (pvid->pending) {\r
      CommandChange();\r
      pvid->pending=0;\r
    }\r
\r
    // If a DMA fill has been set up, do it\r
    if ((pvid->command&0x80) && (pvid->reg[1]&0x10) && (pvid->reg[0x17]>>6)==2)\r
    {\r
      DmaFill(d);\r
    }\r
    else\r
    {\r
      // preliminary FIFO emulation for Chaos Engine, The (E)\r
      if(!(pvid->status&8) && (pvid->reg[1]&0x40) && Pico.m.scanline!=-1 && !(PicoOpt&POPT_DIS_VDP_FIFO)) // active display, accurate mode?\r
      {\r
        pvid->status&=~0x200; // FIFO no longer empty\r
        pvid->lwrite_cnt++;\r
        if (pvid->lwrite_cnt >= 4) pvid->status|=0x100; // FIFO full\r
        if (pvid->lwrite_cnt >  4) {\r
          SekCyclesBurn(32); // penalty // 488/12-8\r
          if (SekCycleCnt>=SekCycleAim) SekEndRun(0);\r
        }\r
        elprintf(EL_ASVDP, "VDP data write: %04x {%i} #%i @ %06x", d, Pico.video.type, pvid->lwrite_cnt, SekPc);\r
      }\r
      VideoWrite(d);\r
    }\r
    return;\r
  }\r
\r
  if (a==0x04) // Control (command) port 4 or 6\r
  {\r
    if(pvid->pending)\r
    {\r
      // Low word of command:\r
      pvid->command&=0xffff0000;\r
      pvid->command|=d;\r
      pvid->pending=0;\r
      CommandChange();\r
    }\r
    else\r
    {\r
      if ((d&0xc000)==0x8000)\r
      {\r
        // Register write:\r
        int num=(d>>8)&0x1f;\r
        int dold=pvid->reg[num];\r
        pvid->type=0; // register writes clear command (else no Sega logo in Golden Axe II)\r
        if (num > 0x0a && !(pvid->reg[1]&4)) {\r
          elprintf(EL_ANOMALY, "%02x written to reg %02x in SMS mode @ %06x", d, num, SekPc);\r
          return;\r
        } else\r
          pvid->reg[num]=(unsigned char)d;\r
\r
        switch (num)\r
        {\r
          case 0x00:\r
            elprintf(EL_INTSW, "hint_onoff: %i->%i [%i] pend=%i @ %06x", (dold&0x10)>>4,\r
                    (d&0x10)>>4, SekCyclesDone(), (pvid->pending_ints&0x10)>>4, SekPc);\r
            goto update_irq;\r
          case 0x01:\r
            elprintf(EL_INTSW, "vint_onoff: %i->%i [%i] pend=%i @ %06x", (dold&0x20)>>5,\r
                    (d&0x20)>>5, SekCyclesDone(), (pvid->pending_ints&0x20)>>5, SekPc);\r
            if (!(d&0x40) && SekCyclesLeft > 390) rendstatus |= PDRAW_EARLY_BLANK;\r
            goto update_irq;\r
          case 0x05:\r
            if (d^dold) rendstatus |= PDRAW_SPRITES_MOVED;\r
            break;\r
          case 0x0c:\r
            // renderers should update their palettes if sh/hi mode is changed\r
            if ((d^dold)&8) Pico.m.dirtyPal = 2;\r
            break;\r
        }\r
        return;\r
\r
update_irq:;\r
#ifndef EMU_CORE_DEBUG\r
        // update IRQ level (Lemmings, Wiz 'n' Liz intro, ... )\r
        // may break if done improperly:\r
        // International Superstar Soccer Deluxe (crash), Street Racer (logos), Burning Force (gfx),\r
        // Fatal Rewind (crash), Sesame Street Counting Cafe\r
        if (!SekShouldInterrupt) // hack\r
        {\r
          int lines, pints, irq=0;\r
          lines = (pvid->reg[1] & 0x20) | (pvid->reg[0] & 0x10);\r
          pints = (pvid->pending_ints&lines);\r
               if(pints & 0x20) irq = 6;\r
          else if(pints & 0x10) irq = 4;\r
          SekInterrupt(irq); // update line\r
\r
          if (irq && Pico.m.scanline!=-1) SekEndRun(24); // make it delayed\r
        }\r
#endif\r
      }\r
      else\r
      {\r
        // High word of command:\r
        pvid->command&=0x0000ffff;\r
        pvid->command|=d<<16;\r
        pvid->pending=1;\r
      }\r
    }\r
  }\r
}\r
\r
PICO_INTERNAL_ASM unsigned int PicoVideoRead(unsigned int a)\r
{\r
  unsigned int d=0;\r
\r
  a&=0x1c;\r
\r
\r
  if (a==0x00) // data port\r
  {\r
    d=VideoRead();\r
    goto end;\r
  }\r
\r
  if (a==0x04) // control port\r
  {\r
    struct PicoVideo *pv=&Pico.video;\r
    d=pv->status;\r
    if (PicoOpt&POPT_ALT_RENDERER) d|=0x0020; // sprite collision (Shadow of the Beast)\r
    if (!(pv->reg[1]&0x40))        d|=0x0008; // set V-Blank if display is disabled\r
    if (SekCyclesLeft < 84+4)      d|=0x0004; // H-Blank (Sonic3 vs)\r
\r
    d|=(pv->pending_ints&0x20)<<2; // V-int pending?\r
    if (d&0x100) pv->status&=~0x100; // FIFO no longer full\r
\r
    pv->pending=0; // ctrl port reads clear write-pending flag (Charles MacDonald)\r
\r
    elprintf(EL_SR, "SR read: %04x @ %06x", d, SekPc);\r
    goto end;\r
  }\r
\r
  // H-counter info (based on Generator):\r
  // frame:\r
  //                       |       <- hblank? ->      |\r
  // start    <416>       hint  <36> hdisplay <38>  end // CPU cycles\r
  // |---------...---------|------------|-------------|\r
  // 0                   B6 E4                       FF // 40 cells\r
  // 0                   93 E8                       FF // 32 cells\r
\r
  // Gens (?)              v-render\r
  // start  <hblank=84>   hint    hdisplay <404>      |\r
  // |---------------------|--------------------------|\r
  // E4  (hc[0x43]==0)    07                         B1 // 40\r
  // E8  (hc[0x45]==0)    05                         91 // 32\r
\r
  // check: Sonic 3D Blast bonus, Cannon Fodder, Chase HQ II, 3 Ninjas kick back, Road Rash 3, Skitchin', Wheel of Fortune\r
  if ((a&0x1c)==0x08)\r
  {\r
    unsigned int hc;\r
\r
    if(Pico.m.scanline != -1) {\r
      int lineCycles=(488-SekCyclesLeft)&0x1ff;\r
      d=Pico.m.scanline; // V-Counter\r
\r
      if(Pico.video.reg[12]&1)\r
           hc=hcounts_40[lineCycles];\r
      else hc=hcounts_32[lineCycles];\r
\r
      //if(lineCycles > 488-12) d++; // Wheel of Fortune\r
    } else {\r
      // get approximate V-Counter\r
      d=vcounts[SekCyclesDone()>>8];\r
      hc = Pico.m.rotate&0xff;\r
    }\r
\r
    if(Pico.m.pal) {\r
      if(d >= 0x103) d-=56; // based on Gens\r
    } else {\r
      if(d >= 0xEB)  d-=6;\r
    }\r
\r
    if((Pico.video.reg[12]&6) == 6) {\r
      // interlace mode 2 (Combat Cars (UE) [!])\r
      d <<= 1;\r
      if (d&0xf00) d|= 1;\r
    }\r
\r
    elprintf(EL_HVCNT, "hv: %02x %02x (%i) @ %06x", hc, d, SekCyclesDone(), SekPc);\r
    d&=0xff; d<<=8;\r
    d|=hc;\r
    goto end;\r
  }\r
\r
end:\r
\r
  return d;\r
}\r
Commit	Line	Data
cc68a136	1	// This is part of Pico Library\r
	2	\r
	3	// (c) Copyright 2004 Dave, All rights reserved.\r
6cadc2da	4	// (c) Copyright 2006-2007, Grazvydas "notaz" Ignotas\r
cc68a136	5	// Free for non-commercial use.\r
	6	\r
	7	// For commercial use, separate licencing terms must be obtained.\r
	8	\r
	9	\r
	10	#include "PicoInt.h"\r
fa1e5e29	11	#include "cd/gfx_cd.h"\r
cc68a136	12	\r
	13	extern const unsigned char hcounts_32[];\r
	14	extern const unsigned char hcounts_40[];\r
	15	extern const unsigned short vcounts[];\r
cc68a136	16	\r
eff55556	17	#ifndef UTYPES_DEFINED\r
ab0607f7	18	typedef unsigned char u8;\r
cc68a136	19	typedef unsigned short u16;\r
eff55556	20	typedef unsigned int u32;\r
	21	#define UTYPES_DEFINED\r
	22	#endif\r
cc68a136	23	\r
5de27868	24	int (PicoDmaHook)(unsigned int source, int len, unsigned short srcp, unsigned short *limitp) = NULL;\r
cc68a136	25	\r
69996cb7	26	static __inline void AutoIncrement(void)\r
cc68a136	27	{\r
	28	Pico.video.addr=(unsigned short)(Pico.video.addr+Pico.video.reg[0xf]);\r
	29	}\r
	30	\r
	31	static void VideoWrite(u16 d)\r
	32	{\r
	33	unsigned int a=Pico.video.addr;\r
	34	\r
	35	switch (Pico.video.type)\r
	36	{\r
	37	case 1: if(a&1) d=(u16)((d<<8)\|(d>>8)); // If address is odd, bytes are swapped (which game needs this?)\r
	38	Pico.vram [(a>>1)&0x7fff]=d;\r
602133e1	39	rendstatus \|= PDRAW_DIRTY_SPRITES; break;\r
cc68a136	40	case 3: Pico.m.dirtyPal = 1;\r
cc68a136	41	Pico.cram [(a>>1)&0x003f]=d; break; // wraps (Desert Strike)\r
cc68a136	42	case 5: Pico.vsram[(a>>1)&0x003f]=d; break;\r
d26dc685	43	//default:elprintf(EL_ANOMALY, "VDP write %04x with bad type %i", d, Pico.video.type); break;\r
cc68a136	44	}\r
	45	\r
	46	//dprintf("w[%i] @ %04x, inc=%i [%i\|%i]", Pico.video.type, a, Pico.video.reg[0xf], Pico.m.scanline, SekCyclesDone());\r
	47	AutoIncrement();\r
	48	}\r
	49	\r
69996cb7	50	static unsigned int VideoRead(void)\r
cc68a136	51	{\r
	52	unsigned int a=0,d=0;\r
	53	\r
	54	a=Pico.video.addr; a>>=1;\r
	55	\r
	56	switch (Pico.video.type)\r
	57	{\r
	58	case 0: d=Pico.vram [a&0x7fff]; break;\r
	59	case 8: d=Pico.cram [a&0x003f]; break;\r
	60	case 4: d=Pico.vsram[a&0x003f]; break;\r
69996cb7	61	default:elprintf(EL_ANOMALY, "VDP read with bad type %i", Pico.video.type); break;\r
cc68a136	62	}\r
4f672280	63	\r
cc68a136	64	AutoIncrement();\r
	65	return d;\r
	66	}\r
	67	\r
69996cb7	68	static int GetDmaLength(void)\r
cc68a136	69	{\r
	70	struct PicoVideo *pvid=&Pico.video;\r
	71	int len=0;\r
	72	// 16-bit words to transfer:\r
	73	len =pvid->reg[0x13];\r
	74	len\|=pvid->reg[0x14]<<8;\r
	75	// Charles MacDonald:\r
	76	if(!len) len = 0xffff;\r
	77	return len;\r
	78	}\r
	79	\r
	80	static void DmaSlow(int len)\r
	81	{\r
	82	u16 pd=0, pdend, *r;\r
	83	unsigned int a=Pico.video.addr, a2, d;\r
	84	unsigned char inc=Pico.video.reg[0xf];\r
672ad671	85	unsigned int source;\r
cc68a136	86	\r
	87	source =Pico.video.reg[0x15]<<1;\r
	88	source\|=Pico.video.reg[0x16]<<9;\r
	89	source\|=Pico.video.reg[0x17]<<17;\r
	90	\r
69996cb7	91	elprintf(EL_VDPDMA, "DmaSlow[%i] %06x->%04x len %i inc=%i blank %i [%i] @ %06x",\r
312e9ce1	92	Pico.video.type, source, a, len, inc, (Pico.video.status&8)\|\|!(Pico.video.reg[1]&0x40),\r
69996cb7	93	SekCyclesDone(), SekPc);\r
cc68a136	94	\r
602133e1	95	if (Pico.m.scanline != -1) {\r
69996cb7	96	Pico.m.dma_xfers += len;\r
602133e1	97	if ((PicoAHW & PAHW_MCD) && (PicoOpt & POPT_EN_MCD_PSYNC)) SekCyclesBurn(CheckDMA());\r
7336a99a	98	else SekSetCyclesLeftNoMCD(SekCyclesLeftNoMCD - CheckDMA());\r
672ad671	99	} else {\r
	100	// be approximate in non-accurate mode\r
	101	SekSetCyclesLeft(SekCyclesLeft - (len*(((488<<8)/167))>>8));\r
	102	}\r
	103	\r
ab0607f7	104	if ((source&0xe00000)==0xe00000) { // Ram\r
	105	pd=(u16 *)(Pico.ram+(source&0xfffe));\r
	106	pdend=(u16 *)(Pico.ram+0x10000);\r
602133e1	107	}\r
	108	else if (PicoAHW & PAHW_MCD)\r
	109	{\r
69996cb7	110	elprintf(EL_VDPDMA, "DmaSlow CD, r3=%02x", Pico_mcd->s68k_regs[3]);\r
ab0607f7	111	if(source<0x20000) { // Bios area\r
	112	pd=(u16 *)(Pico_mcd->bios+(source&~1));\r
	113	pdend=(u16 *)(Pico_mcd->bios+0x20000);\r
fa1e5e29	114	} else if ((source&0xfc0000)==0x200000) { // Word Ram\r
fa1e5e29	115	source -= 2;\r
ab0607f7	116	if (!(Pico_mcd->s68k_regs[3]&4)) { // 2M mode\r
fa1e5e29	117	pd=(u16 *)(Pico_mcd->word_ram2M+(source&0x3fffe));\r
fa1e5e29	118	pdend=(u16 *)(Pico_mcd->word_ram2M+0x40000);\r
ab0607f7	119	} else {\r
fa1e5e29	120	if (source < 0x220000) { // 1M mode\r
	121	int bank = Pico_mcd->s68k_regs[3]&1;\r
	122	pd=(u16 *)(Pico_mcd->word_ram1M[bank]+(source&0x1fffe));\r
	123	pdend=(u16 *)(Pico_mcd->word_ram1M[bank]+0x20000);\r
69996cb7	124	} else {\r
fa1e5e29	125	DmaSlowCell(source, a, len, inc);\r
fa1e5e29	126	return;\r
69996cb7	127	}\r
ab0607f7	128	}\r
	129	} else if ((source&0xfe0000)==0x020000) { // Prg Ram\r
	130	u8 *prg_ram = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];\r
	131	pd=(u16 *)(prg_ram+(source&0x1fffe));\r
	132	pdend=(u16 *)(prg_ram+0x20000);\r
	133	} else {\r
03e4f2a3	134	elprintf(EL_VDPDMA\|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: FIXME: unsupported src", Pico.video.type, source, a);\r
ab0607f7	135	return;\r
ab0607f7	136	}\r
602133e1	137	}\r
	138	else\r
	139	{\r
50483b53	140	// if we have DmaHook, let it handle ROM because of possible DMA delay\r
	141	if (PicoDmaHook && PicoDmaHook(source, len, &pd, &pdend));\r
	142	else if (source<Pico.romsize) { // Rom\r
ab0607f7	143	pd=(u16 *)(Pico.rom+(source&~1));\r
ab0607f7	144	pdend=(u16 *)(Pico.rom+Pico.romsize);\r
f8ef8ff7	145	}\r
f8ef8ff7	146	else {\r
03e4f2a3	147	elprintf(EL_VDPDMA\|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: invalid src", Pico.video.type, source, a);\r
ab0607f7	148	return;\r
	149	}\r
	150	}\r
	151	\r
	152	// overflow protection, might break something..\r
	153	if (len > pdend - pd) {\r
	154	len = pdend - pd;\r
69996cb7	155	elprintf(EL_VDPDMA\|EL_ANOMALY, "DmaSlow overflow");\r
672ad671	156	}\r
cc68a136	157	\r
	158	switch (Pico.video.type)\r
	159	{\r
	160	case 1: // vram\r
	161	r = Pico.vram;\r
cea65903	162	if (inc == 2 && !(a&1) && a+len*2 < 0x10000)\r
cc68a136	163	{\r
cea65903	164	// most used DMA mode\r
fa1e5e29	165	memcpy16(r + (a>>1), pd, len);\r
fa1e5e29	166	a += len*2;\r
cea65903	167	}\r
	168	else\r
	169	{\r
	170	for(; len; len--)\r
	171	{\r
	172	d=*pd++;\r
	173	if(a&1) d=(d<<8)\|(d>>8);\r
	174	r[a>>1] = (u16)d; // will drop the upper bits\r
	175	// AutoIncrement\r
	176	a=(u16)(a+inc);\r
	177	// didn't src overlap?\r
	178	//if(pd >= pdend) pd-=0x8000; // should be good for RAM, bad for ROM\r
	179	}\r
cc68a136	180	}\r
602133e1	181	rendstatus \|= PDRAW_DIRTY_SPRITES;\r
cc68a136	182	break;\r
4f672280	183	\r
cc68a136	184	case 3: // cram\r
cc68a136	185	Pico.m.dirtyPal = 1;\r
	186	r = Pico.cram;\r
	187	for(a2=a&0x7f; len; len--)\r
	188	{\r
0a051f55	189	r[a2>>1] = (u16)*pd++; // bit 0 is ignored\r
cc68a136	190	// AutoIncrement\r
	191	a2+=inc;\r
	192	// didn't src overlap?\r
ab0607f7	193	//if(pd >= pdend) pd-=0x8000;\r
cc68a136	194	// good dest?\r
	195	if(a2 >= 0x80) break; // Todds Adventures in Slime World / Andre Agassi tennis\r
	196	}\r
	197	a=(a&0xff00)\|a2;\r
	198	break;\r
	199	\r
	200	case 5: // vsram[a&0x003f]=d;\r
	201	r = Pico.vsram;\r
	202	for(a2=a&0x7f; len; len--)\r
	203	{\r
	204	r[a2>>1] = (u16)*pd++;\r
	205	// AutoIncrement\r
	206	a2+=inc;\r
	207	// didn't src overlap?\r
ab0607f7	208	//if(pd >= pdend) pd-=0x8000;\r
cc68a136	209	// good dest?\r
	210	if(a2 >= 0x80) break;\r
	211	}\r
	212	a=(a&0xff00)\|a2;\r
	213	break;\r
69996cb7	214	\r
	215	default:\r
	216	elprintf(EL_VDPDMA\|EL_ANOMALY, "DMA with bad type %i", Pico.video.type);\r
	217	break;\r
cc68a136	218	}\r
	219	// remember addr\r
	220	Pico.video.addr=(u16)a;\r
	221	}\r
	222	\r
	223	static void DmaCopy(int len)\r
	224	{\r
	225	u16 a=Pico.video.addr;\r
	226	unsigned char vr = (unsigned char ) Pico.vram;\r
	227	unsigned char *vrs;\r
	228	unsigned char inc=Pico.video.reg[0xf];\r
	229	int source;\r
69996cb7	230	elprintf(EL_VDPDMA, "DmaCopy len %i [%i]", len, SekCyclesDone());\r
4f672280	231	\r
69996cb7	232	Pico.m.dma_xfers += len;\r
8c1952f0	233	if(Pico.m.scanline != -1)\r
8c1952f0	234	Pico.video.status\|=2; // dma busy\r
cc68a136	235	\r
	236	source =Pico.video.reg[0x15];\r
	237	source\|=Pico.video.reg[0x16]<<8;\r
	238	vrs=vr+source;\r
	239	\r
	240	if(source+len > 0x10000) len=0x10000-source; // clip??\r
	241	\r
	242	for(;len;len--)\r
	243	{\r
	244	vr[a] = *vrs++;\r
	245	// AutoIncrement\r
	246	a=(u16)(a+inc);\r
	247	}\r
	248	// remember addr\r
	249	Pico.video.addr=a;\r
602133e1	250	rendstatus \|= PDRAW_DIRTY_SPRITES;\r
cc68a136	251	}\r
	252	\r
	253	// check: Contra, Megaman\r
	254	// note: this is still inaccurate\r
	255	static void DmaFill(int data)\r
	256	{\r
	257	int len;\r
	258	unsigned short a=Pico.video.addr;\r
	259	unsigned char vr=(unsigned char ) Pico.vram;\r
	260	unsigned char high = (unsigned char) (data >> 8);\r
	261	unsigned char inc=Pico.video.reg[0xf];\r
4f672280	262	\r
cc68a136	263	len=GetDmaLength();\r
69996cb7	264	elprintf(EL_VDPDMA, "DmaFill len %i inc %i [%i]", len, inc, SekCyclesDone());\r
4f672280	265	\r
69996cb7	266	Pico.m.dma_xfers += len;\r
8c1952f0	267	if(Pico.m.scanline != -1)\r
8c1952f0	268	Pico.video.status\|=2; // dma busy (in accurate mode)\r
cc68a136	269	\r
	270	// from Charles MacDonald's genvdp.txt:\r
	271	// Write lower byte to address specified\r
	272	vr[a] = (unsigned char) data;\r
	273	a=(u16)(a+inc);\r
	274	\r
	275	if(!inc) len=1;\r
	276	\r
	277	for(;len;len--) {\r
	278	// Write upper byte to adjacent address\r
	279	// (here we are byteswapped, so address is already 'adjacent')\r
	280	vr[a] = high;\r
	281	\r
	282	// Increment address register\r
	283	a=(u16)(a+inc);\r
	284	}\r
	285	// remember addr\r
	286	Pico.video.addr=a;\r
	287	// update length\r
	288	Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0; // Dino Dini's Soccer (E) (by Haze)\r
	289	\r
602133e1	290	rendstatus \|= PDRAW_DIRTY_SPRITES;\r
cc68a136	291	}\r
cc68a136	292	\r
69996cb7	293	static void CommandDma(void)\r
cc68a136	294	{\r
	295	struct PicoVideo *pvid=&Pico.video;\r
	296	int len=0,method=0;\r
	297	\r
	298	if ((pvid->reg[1]&0x10)==0) return; // DMA not enabled\r
	299	\r
	300	len=GetDmaLength();\r
	301	\r
	302	method=pvid->reg[0x17]>>6;\r
	303	if (method< 2) DmaSlow(len); // 68000 to VDP\r
	304	if (method==3) DmaCopy(len); // VRAM Copy\r
	305	}\r
	306	\r
69996cb7	307	static void CommandChange(void)\r
cc68a136	308	{\r
	309	struct PicoVideo *pvid=&Pico.video;\r
	310	unsigned int cmd=0,addr=0;\r
	311	\r
	312	cmd=pvid->command;\r
	313	\r
	314	// Get type of transfer 0xc0000030 (v/c/vsram read/write)\r
	315	pvid->type=(unsigned char)(((cmd>>2)&0xc)\|(cmd>>30));\r
	316	\r
	317	// Get address 0x3fff0003\r
	318	addr =(cmd>>16)&0x3fff;\r
	319	addr\|=(cmd<<14)&0xc000;\r
	320	pvid->addr=(unsigned short)addr;\r
cc68a136	321	\r
	322	// Check for dma:\r
	323	if (cmd&0x80) CommandDma();\r
	324	}\r
	325	\r
eff55556	326	PICO_INTERNAL_ASM void PicoVideoWrite(unsigned int a,unsigned short d)\r
cc68a136	327	{\r
	328	struct PicoVideo *pvid=&Pico.video;\r
	329	\r
	330	a&=0x1c;\r
	331	\r
	332	if (a==0x00) // Data port 0 or 2\r
4f672280	333	{\r
69996cb7	334	if (pvid->pending) {\r
	335	CommandChange();\r
	336	pvid->pending=0;\r
	337	}\r
cc68a136	338	\r
	339	// If a DMA fill has been set up, do it\r
	340	if ((pvid->command&0x80) && (pvid->reg[1]&0x10) && (pvid->reg[0x17]>>6)==2)\r
	341	{\r
	342	DmaFill(d);\r
	343	}\r
	344	else\r
	345	{\r
69996cb7	346	// preliminary FIFO emulation for Chaos Engine, The (E)\r
602133e1	347	if(!(pvid->status&8) && (pvid->reg[1]&0x40) && Pico.m.scanline!=-1 && !(PicoOpt&POPT_DIS_VDP_FIFO)) // active display, accurate mode?\r
69996cb7	348	{\r
	349	pvid->status&=~0x200; // FIFO no longer empty\r
	350	pvid->lwrite_cnt++;\r
	351	if (pvid->lwrite_cnt >= 4) pvid->status\|=0x100; // FIFO full\r
	352	if (pvid->lwrite_cnt > 4) {\r
	353	SekCyclesBurn(32); // penalty // 488/12-8\r
	354	if (SekCycleCnt>=SekCycleAim) SekEndRun(0);\r
	355	}\r
	356	elprintf(EL_ASVDP, "VDP data write: %04x {%i} #%i @ %06x", d, Pico.video.type, pvid->lwrite_cnt, SekPc);\r
	357	}\r
cc68a136	358	VideoWrite(d);\r
	359	}\r
	360	return;\r
	361	}\r
	362	\r
	363	if (a==0x04) // Control (command) port 4 or 6\r
	364	{\r
cc68a136	365	if(pvid->pending)\r
	366	{\r
	367	// Low word of command:\r
	368	pvid->command&=0xffff0000;\r
	369	pvid->command\|=d;\r
	370	pvid->pending=0;\r
	371	CommandChange();\r
602133e1	372	}\r
	373	else\r
	374	{\r
	375	if ((d&0xc000)==0x8000)\r
cc68a136	376	{\r
	377	// Register write:\r
	378	int num=(d>>8)&0x1f;\r
0ffefdb8	379	int dold=pvid->reg[num];\r
602133e1	380	pvid->type=0; // register writes clear command (else no Sega logo in Golden Axe II)\r
0ffefdb8	381	if (num > 0x0a && !(pvid->reg[1]&4)) {\r
0ffefdb8	382	elprintf(EL_ANOMALY, "%02x written to reg %02x in SMS mode @ %06x", d, num, SekPc);\r
602133e1	383	return;\r
0ffefdb8	384	} else\r
602133e1	385	pvid->reg[num]=(unsigned char)d;\r
	386	\r
	387	switch (num)\r
	388	{\r
	389	case 0x00:\r
	390	elprintf(EL_INTSW, "hint_onoff: %i->%i [%i] pend=%i @ %06x", (dold&0x10)>>4,\r
	391	(d&0x10)>>4, SekCyclesDone(), (pvid->pending_ints&0x10)>>4, SekPc);\r
	392	goto update_irq;\r
	393	case 0x01:\r
	394	elprintf(EL_INTSW, "vint_onoff: %i->%i [%i] pend=%i @ %06x", (dold&0x20)>>5,\r
	395	(d&0x20)>>5, SekCyclesDone(), (pvid->pending_ints&0x20)>>5, SekPc);\r
9333d7f7	396	if (!(d&0x40) && SekCyclesLeft > 390) rendstatus \|= PDRAW_EARLY_BLANK;\r
602133e1	397	goto update_irq;\r
	398	case 0x05:\r
	399	if (d^dold) rendstatus \|= PDRAW_SPRITES_MOVED;\r
	400	break;\r
	401	case 0x0c:\r
	402	// renderers should update their palettes if sh/hi mode is changed\r
	403	if ((d^dold)&8) Pico.m.dirtyPal = 2;\r
	404	break;\r
	405	}\r
	406	return;\r
	407	\r
99464b62	408	update_irq:;\r
03e4f2a3	409	#ifndef EMU_CORE_DEBUG\r
cc68a136	410	// update IRQ level (Lemmings, Wiz 'n' Liz intro, ... )\r
cc68a136	411	// may break if done improperly:\r
69996cb7	412	// International Superstar Soccer Deluxe (crash), Street Racer (logos), Burning Force (gfx),\r
03e4f2a3	413	// Fatal Rewind (crash), Sesame Street Counting Cafe\r
602133e1	414	if (!SekShouldInterrupt) // hack\r
03e4f2a3	415	{\r
602133e1	416	int lines, pints, irq=0;\r
	417	lines = (pvid->reg[1] & 0x20) \| (pvid->reg[0] & 0x10);\r
	418	pints = (pvid->pending_ints&lines);\r
	419	if(pints & 0x20) irq = 6;\r
	420	else if(pints & 0x10) irq = 4;\r
	421	SekInterrupt(irq); // update line\r
	422	\r
	423	if (irq && Pico.m.scanline!=-1) SekEndRun(24); // make it delayed\r
cc68a136	424	}\r
cc68a136	425	#endif\r
602133e1	426	}\r
	427	else\r
	428	{\r
cc68a136	429	// High word of command:\r
	430	pvid->command&=0x0000ffff;\r
	431	pvid->command\|=d<<16;\r
	432	pvid->pending=1;\r
	433	}\r
	434	}\r
	435	}\r
	436	}\r
	437	\r
eff55556	438	PICO_INTERNAL_ASM unsigned int PicoVideoRead(unsigned int a)\r
cc68a136	439	{\r
cc68a136	440	unsigned int d=0;\r
4f672280	441	\r
cc68a136	442	a&=0x1c;\r
cc68a136	443	\r
69996cb7	444	\r
cc68a136	445	if (a==0x00) // data port\r
	446	{\r
	447	d=VideoRead();\r
	448	goto end;\r
	449	}\r
	450	\r
	451	if (a==0x04) // control port\r
	452	{\r
69996cb7	453	struct PicoVideo *pv=&Pico.video;\r
69996cb7	454	d=pv->status;\r
602133e1	455	if (PicoOpt&POPT_ALT_RENDERER) d\|=0x0020; // sprite collision (Shadow of the Beast)\r
	456	if (!(pv->reg[1]&0x40)) d\|=0x0008; // set V-Blank if display is disabled\r
	457	if (SekCyclesLeft < 84+4) d\|=0x0004; // H-Blank (Sonic3 vs)\r
69996cb7	458	\r
	459	d\|=(pv->pending_ints&0x20)<<2; // V-int pending?\r
	460	if (d&0x100) pv->status&=~0x100; // FIFO no longer full\r
cc68a136	461	\r
69996cb7	462	pv->pending=0; // ctrl port reads clear write-pending flag (Charles MacDonald)\r
cc68a136	463	\r
69996cb7	464	elprintf(EL_SR, "SR read: %04x @ %06x", d, SekPc);\r
cc68a136	465	goto end;\r
	466	}\r
	467	\r
	468	// H-counter info (based on Generator):\r
	469	// frame:\r
	470	// \| <- hblank? -> \|\r
	471	// start <416> hint <36> hdisplay <38> end // CPU cycles\r
	472	// \|---------...---------\|------------\|-------------\|\r
	473	// 0 B6 E4 FF // 40 cells\r
	474	// 0 93 E8 FF // 32 cells\r
	475	\r
	476	// Gens (?) v-render\r
	477	// start <hblank=84> hint hdisplay <404> \|\r
	478	// \|---------------------\|--------------------------\|\r
	479	// E4 (hc[0x43]==0) 07 B1 // 40\r
	480	// E8 (hc[0x45]==0) 05 91 // 32\r
4f672280	481	\r
cc68a136	482	// check: Sonic 3D Blast bonus, Cannon Fodder, Chase HQ II, 3 Ninjas kick back, Road Rash 3, Skitchin', Wheel of Fortune\r
	483	if ((a&0x1c)==0x08)\r
	484	{\r
	485	unsigned int hc;\r
	486	\r
	487	if(Pico.m.scanline != -1) {\r
	488	int lineCycles=(488-SekCyclesLeft)&0x1ff;\r
	489	d=Pico.m.scanline; // V-Counter\r
	490	\r
	491	if(Pico.video.reg[12]&1)\r
	492	hc=hcounts_40[lineCycles];\r
	493	else hc=hcounts_32[lineCycles];\r
	494	\r
8c1952f0	495	//if(lineCycles > 488-12) d++; // Wheel of Fortune\r
cc68a136	496	} else {\r
	497	// get approximate V-Counter\r
	498	d=vcounts[SekCyclesDone()>>8];\r
	499	hc = Pico.m.rotate&0xff;\r
	500	}\r
	501	\r
	502	if(Pico.m.pal) {\r
	503	if(d >= 0x103) d-=56; // based on Gens\r
	504	} else {\r
	505	if(d >= 0xEB) d-=6;\r
	506	}\r
	507	\r
	508	if((Pico.video.reg[12]&6) == 6) {\r
	509	// interlace mode 2 (Combat Cars (UE) [!])\r
	510	d <<= 1;\r
	511	if (d&0xf00) d\|= 1;\r
	512	}\r
	513	\r
69996cb7	514	elprintf(EL_HVCNT, "hv: %02x %02x (%i) @ %06x", hc, d, SekCyclesDone(), SekPc);\r
cc68a136	515	d&=0xff; d<<=8;\r
	516	d\|=hc;\r
	517	goto end;\r
	518	}\r
	519	\r
	520	end:\r
	521	\r
	522	return d;\r
	523	}\r