[picodrive.git] / Pico / Pico.c

// This is part of Pico Library\r
\r
// (c) Copyright 2004 Dave, All rights reserved.\r
// (c) Copyright 2006 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/sound.h"\r
#include "sound/ym2612.h"\r
\r
int PicoVer=0x0080;\r
struct Pico Pico;\r
int PicoOpt=0; // disable everything by default\r
int PicoSkipFrame=0; // skip rendering frame?\r
int PicoRegionOverride = 0; // override the region detection 0: Auto, 1: Japan NTSC, 2: Japan PAL, 4: US, 8: Europe\r
int emustatus = 0;\r
void (*PicoWriteSound)(void) = 0; // called once per frame at the best time to send sound buffer (PsndOut) to hardware\r
\r
struct PicoSRAM SRam;\r
int z80startCycle = 0, z80stopCycle = 0; // in 68k cycles\r
//int z80ExtraCycles = 0;\r
int PicoPad[2]; // Joypads, format is SACB RLDU\r
int PicoMCD = 0; // mega CD status\r
\r
// to be called once on emu init\r
int PicoInit(void)\r
{\r
  // Blank space for state:\r
  memset(&Pico,0,sizeof(Pico));\r
  memset(&PicoPad,0,sizeof(PicoPad));\r
\r
  // Init CPUs:\r
  SekInit();\r
  z80_init(); // init even if we aren't going to use it\r
\r
  // Setup memory callbacks:\r
  PicoMemInit();\r
\r
  PicoInitMCD();\r
\r
  // notaz: sram\r
  SRam.data=0;\r
  SRam.resize=1;\r
\r
  return 0;\r
}\r
\r
// to be called once on emu exit\r
void PicoExit(void)\r
{\r
  PicoExitMCD();\r
  z80_exit();\r
\r
  // notaz: sram\r
  if(SRam.data) free(SRam.data); SRam.data=0;\r
}\r
\r
int PicoReset(int hard)\r
{\r
  unsigned int region=0;\r
  int support=0,hw=0,i=0;\r
  unsigned char pal=0;\r
\r
  if (Pico.romsize<=0) return 1;\r
\r
  PicoMemReset();\r
  SekReset();\r
  SekCycleCntT=0;\r
  z80_reset();\r
\r
  // reset VDP state, VRAM and PicoMisc\r
  //memset(&Pico.video,0,sizeof(Pico.video));\r
  //memset(&Pico.vram,0,sizeof(Pico.vram));\r
  memset(&Pico.m,0,sizeof(Pico.m));\r
  Pico.video.pending_ints=0;\r
  emustatus = 0;\r
\r
  if(hard) {\r
    // clear all memory of the emulated machine\r
    memset(&Pico.ram,0,(unsigned int)&Pico.rom-(unsigned int)&Pico.ram);\r
  }\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
  Pico.m.dirtyPal = 1;\r
\r
  if(PicoRegionOverride)\r
  {\r
    support = PicoRegionOverride;\r
  }\r
  else\r
  {\r
    // Read cartridge region data:\r
    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\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
  // 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
  Pico.video.status = 0x3408 | pal; // always set bits | vblank | pal\r
\r
  sound_reset(); // pal must be known here\r
\r
  if (PicoMCD & 1) {\r
    PicoResetMCD(hard);\r
    SRam.data = 0;\r
    return 0;\r
  }\r
\r
\r
  // notaz: sram\r
  if(SRam.resize) {\r
    int sram_size = 0;\r
    if(SRam.data) free(SRam.data); SRam.data=0;\r
    Pico.m.sram_reg = 0;\r
\r
    if(*(Pico.rom+0x1B1) == 'R' && *(Pico.rom+0x1B0) == 'A') {\r
      if(*(Pico.rom+0x1B2) & 0x40) {\r
        // EEPROM SRAM\r
        // what kind of EEPROMs are actually used? X24C02? X24C04? (X24C01 has only 128), but we will support up to 8K\r
        SRam.start = PicoRead32(0x1B4) & ~1; // zero address is used for clock by some games\r
        SRam.end   = PicoRead32(0x1B8);\r
        sram_size  = 0x2000;\r
        Pico.m.sram_reg = 4;\r
      } else {\r
        // normal SRAM\r
        SRam.start = PicoRead32(0x1B4) & 0xFFFF00;\r
        SRam.end   = PicoRead32(0x1B8) | 1;\r
        sram_size  = SRam.end - SRam.start + 1;\r
      }\r
      Pico.m.sram_reg |= 0x10; // SRAM was detected\r
    }\r
    if(sram_size <= 0) {\r
      // some games may have bad headers, like S&K and Sonic3\r
      SRam.start = 0x200000;\r
      SRam.end   = 0x203FFF;\r
      sram_size  = 0x004000;\r
    }\r
\r
    // enable sram access by default if it doesn't overlap with ROM\r
    if(Pico.romsize <= SRam.start) Pico.m.sram_reg |= 1;\r
    SRam.reg_back = Pico.m.sram_reg;\r
\r
    if(sram_size) {\r
      SRam.data = (unsigned char *) calloc(sram_size, 1);\r
      if(!SRam.data) return 1;\r
    }\r
    SRam.resize=0;\r
    // Dino Dini's Soccer malfunctions if SRAM is not filled with 0xff\r
    if (strncmp((char *)Pico.rom+0x150, "IDOND NI'I", 10) == 0)\r
      memset(SRam.data, 0xff, sram_size);\r
  }\r
\r
  Pico.m.sram_reg = SRam.reg_back; // restore sram_reg\r
  SRam.changed = 0;\r
\r
  return 0;\r
}\r
\r
static int dma_timings[] = {\r
83,  167, 166,  83, // vblank: 32cell: dma2vram dma2[vs|c]ram vram_fill vram_copy\r
102, 205, 204, 102, // vblank: 40cell:\r
8,    16,  15,   8, // active: 32cell:\r
9,    18,  17,   9  // ...\r
};\r
\r
static void CheckDMA(void)\r
{\r
  int burn = 0, bytes_can = 0, dma_op = Pico.video.reg[0x17]>>6; // see gens for 00 and 01 modes\r
  int bytes = Pico.m.dma_bytes;\r
\r
  if(dma_op & 2) bytes_can = dma_op;\r
  else if(Pico.video.type!=1) bytes_can  = 1; // setting dma_timings offset here according to Gens\r
  if(Pico.video.reg[12] & 1)  bytes_can += 4; // 40 cell mode?\r
  if(!(Pico.video.status&8)&&(Pico.video.reg[1]&0x40)) { dma_op|=4; bytes_can += 8; } // active display?\r
  bytes_can = dma_timings[bytes_can];\r
\r
  if(bytes <= bytes_can) {\r
    if(dma_op&2) Pico.video.status&=~2; // dma no longer busy\r
    else {\r
      if(dma_op&4) burn = bytes*(((488<<8)/18 ))>>8; // have to be approximate because can't afford division..\r
      else         burn = bytes*(((488<<8)/205))>>8;\r
    }\r
    Pico.m.dma_bytes = 0;\r
  } else {\r
    if(!(dma_op&2)) burn = 488;\r
    Pico.m.dma_bytes -= bytes_can;\r
  }\r
\r
  SekCycleCnt+=burn;\r
  dprintf("~Dma %i op=%i can=%i burn=%i [%i|%i]", Pico.m.dma_bytes, dma_op, bytes_can, burn, Pico.m.scanline, SekCyclesDone());\r
}\r
\r
static __inline void SekRun(int cyc)\r
{\r
  int cyc_do;\r
  SekCycleAim+=cyc;\r
#if 0\r
  if(Pico.m.dma_bytes) {\r
    int burn=0;\r
    if((Pico.video.status&8)||!(Pico.video.reg[1]&0x40)) { // vblank?\r
      if(Pico.m.dma_bytes < 205) {\r
	burn = Pico.m.dma_bytes*(((488<<8)/205))>>8;\r
	Pico.m.dma_bytes = 0;\r
      } else {\r
        burn += 488;\r
	Pico.m.dma_bytes -= 205;\r
      }\r
    } else {\r
      if(Pico.m.dma_bytes < 18) {\r
	burn = Pico.m.dma_bytes*(((488<<8)/18))>>8;\r
	Pico.m.dma_bytes = 0;\r
      } else {\r
        burn += 488;\r
	Pico.m.dma_bytes -= 18;\r
      }\r
    }\r
    SekCycleCnt+=burn;\r
    dprintf("~DmaSlow %i burn=%i do=%i [%i|%i]", Pico.m.dma_bytes, burn, SekCycleAim-SekCycleCnt,\r
    		Pico.m.scanline, SekCyclesDone());\r
  }\r
#endif\r
  if((cyc_do=SekCycleAim-SekCycleCnt) <= 0) return;\r
#if   defined(EMU_C68K) && defined(EMU_M68K)\r
  // this means we do run-compare Cyclone vs Musashi\r
  SekCycleCnt+=CM_compareRun(cyc_do);\r
#elif defined(EMU_C68K)\r
  PicoCpu.cycles=cyc_do;\r
  CycloneRun(&PicoCpu);\r
  SekCycleCnt+=cyc_do-PicoCpu.cycles;\r
#elif defined(EMU_A68K)\r
  m68k_ICount=cyc_do;\r
  M68000_RUN();\r
  SekCycleCnt+=cyc_do-m68k_ICount;\r
#elif defined(EMU_M68K)\r
  SekCycleCnt+=m68k_execute(cyc_do);\r
#endif\r
}\r
\r
static __inline void SekStep(void)\r
{\r
  // this is required for timing sensitive stuff to work\r
  int realaim=SekCycleAim; SekCycleAim=SekCycleCnt+1;\r
#if   defined(EMU_C68K) && defined(EMU_M68K)\r
  // this means we do run-compare Cyclone vs Musashi\r
  SekCycleCnt+=CM_compareRun(1);\r
#elif defined(EMU_C68K)\r
  PicoCpu.cycles=1;\r
  CycloneRun(&PicoCpu);\r
  SekCycleCnt+=1-PicoCpu.cycles;\r
#elif defined(EMU_A68K)\r
  m68k_ICount=1;\r
  M68000_RUN();\r
  SekCycleCnt+=1-m68k_ICount;\r
#elif defined(EMU_M68K)\r
  SekCycleCnt+=m68k_execute(1);\r
#endif\r
  SekCycleAim=realaim;\r
}\r
\r
static int CheckIdle(void)\r
{\r
#if 1\r
  unsigned char state[0x88];\r
\r
  memset(state,0,sizeof(state));\r
\r
  // See if the state is the same after 2 steps:\r
  SekState(state); SekStep(); SekStep(); SekState(state+0x44);\r
  if (memcmp(state,state+0x44,0x44)==0) return 1;\r
#else\r
  unsigned char state[0x44];\r
  static unsigned char oldstate[0x44];\r
\r
  SekState(state);\r
  if(memcmp(state,oldstate,0x40)==0) return 1;\r
  memcpy(oldstate, state, 0x40);\r
#endif\r
\r
  return 0;\r
}\r
\r
// to be called on 224 or line_sample scanlines only\r
static __inline void getSamples(int y)\r
{\r
  if(y == 224) {\r
    //dprintf("sta%i: %i [%i]", (emustatus & 2), emustatus, y);\r
    if(emustatus & 2)\r
        sound_render(PsndLen/2, PsndLen-PsndLen/2);\r
    else sound_render(0, PsndLen);\r
    if (emustatus&1) emustatus|=2; else emustatus&=~2;\r
    if (PicoWriteSound) PicoWriteSound();\r
    // clear sound buffer\r
    memset(PsndOut, 0, (PicoOpt & 8) ? (PsndLen<<2) : (PsndLen<<1));\r
  }\r
  else if(emustatus & 3) {\r
    emustatus|= 2;\r
    emustatus&=~1;\r
    sound_render(0, PsndLen/2);\r
  }\r
}\r
\r
//extern UINT32 mz80GetRegisterValue(void *, UINT32);\r
\r
// Accurate but slower frame which does hints\r
static int PicoFrameHints(void)\r
{\r
  struct PicoVideo *pv=&Pico.video;\r
  int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample;\r
  const int cycles_68k=488,cycles_z80=228; // both PAL and NTSC compile to same values\r
  int skip=PicoSkipFrame || (PicoOpt&0x10);\r
  int hint; // Hint counter\r
\r
  if(Pico.m.pal) { //\r
    //cycles_68k = (int) ((double) OSC_PAL  /  7 / 50 / 312 + 0.4); // should compile to a constant (488)\r
    //cycles_z80 = (int) ((double) OSC_PAL  / 15 / 50 / 312 + 0.4); // 228\r
    lines  = 312;    // Steve Snake says there are 313 lines, but this seems to also work well\r
    line_sample = 68;\r
    if(pv->reg[1]&8) lines_vis = 240;\r
  } else {\r
    //cycles_68k = (int) ((double) OSC_NTSC /  7 / 60 / 262 + 0.4); // 488\r
    //cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228\r
    lines  = 262;\r
    line_sample = 93;\r
  }\r
\r
  SekCyclesReset();\r
  //z80ExtraCycles = 0;\r
\r
  if(PicoOpt&4)\r
    z80CycleAim = 0;\r
//    z80_resetCycles();\r
\r
  pv->status&=~0x88; // clear V-Int, come out of vblank\r
\r
  hint=pv->reg[10]; // Load H-Int counter\r
  //dprintf("-hint: %i", hint);\r
\r
  for (y=0;y<lines;y++)\r
  {\r
    Pico.m.scanline=(short)y;\r
\r
    // pad delay (for 6 button pads)\r
    if(PicoOpt&0x20) {\r
      if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0;\r
      if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0;\r
    }\r
\r
    // H-Interrupts:\r
    if(y <= lines_vis && --hint < 0) // y <= lines_vis: Comix Zone, Golden Axe\r
    {\r
      //dprintf("rhint:old @ %06x", SekPc);\r
      hint=pv->reg[10]; // Reload H-Int counter\r
      pv->pending_ints|=0x10;\r
      if (pv->reg[0]&0x10) SekInterrupt(4);\r
      //dprintf("rhint: %i @ %06x [%i|%i]", hint, SekPc, y, SekCycleCnt);\r
      //dprintf("hint_routine: %x", (*(unsigned short*)(Pico.ram+0x0B84)<<16)|*(unsigned short*)(Pico.ram+0x0B86));\r
    }\r
\r
    // V-Interrupt:\r
    if (y == lines_vis)\r
    {\r
      //dprintf("vint: @ %06x [%i|%i]", SekPc, y, SekCycleCnt);\r
      pv->status|=0x88; // V-Int happened, go into vblank\r
      if(!Pico.m.dma_bytes||(Pico.video.reg[0x17]&0x80)) {\r
        // there must be a gap between H and V ints, also after vblank bit set (Mazin Saga, Bram Stoker's Dracula)\r
        SekRun(128); SekCycleAim-=128;\r
      }\r
      pv->pending_ints|=0x20;\r
      if(pv->reg[1]&0x20) SekInterrupt(6);\r
      if(Pico.m.z80Run && (PicoOpt&4)) // ?\r
        z80_int();\r
      //dprintf("zint: [%i|%i] zPC=%04x", Pico.m.scanline, SekCyclesDone(), mz80GetRegisterValue(NULL, 0));\r
    }\r
\r
    // decide if we draw this line\r
#if CAN_HANDLE_240_LINES\r
    if(!skip && ((!(pv->reg[1]&8) && y<224) || ((pv->reg[1]&8) && y<240)) )\r
#else\r
    if(!skip && y<224)\r
#endif\r
      PicoLine(y);\r
\r
    if(PicoOpt&1)\r
      sound_timers_and_dac(y);\r
\r
    // get samples from sound chips\r
    if(y == 32 && PsndOut)\r
      emustatus &= ~1;\r
    else if((y == 224 || y == line_sample) && PsndOut)\r
      getSamples(y);\r
\r
    // Run scanline:\r
    if(Pico.m.dma_bytes) CheckDMA();\r
    SekRun(cycles_68k);\r
    if((PicoOpt&4) && Pico.m.z80Run) {\r
      Pico.m.z80Run|=2;\r
      z80CycleAim+=cycles_z80;\r
      total_z80+=z80_run(z80CycleAim-total_z80);\r
    }\r
  }\r
\r
  // draw a frame just after vblank in alternative render mode\r
  if(!PicoSkipFrame && (PicoOpt&0x10))\r
    PicoFrameFull();\r
\r
  return 0;\r
}\r
\r
// helper z80 runner\r
static void PicoRunZ80Simple(int line_from, int line_to)\r
{\r
  int line_from_r=line_from, line_to_r=line_to, line = line_from;\r
  int line_sample = Pico.m.pal ? 68 : 93;\r
  extern const unsigned short vcounts[];\r
\r
  if(!(PicoOpt&4) || Pico.m.z80Run == 0) { line_from_r = line_to_r; line_to_r = 0; }\r
\r
  if(z80startCycle != 0) {\r
    line_from_r = vcounts[z80startCycle>>8]+1;\r
    z80startCycle = 0;\r
  }\r
  if(z80stopCycle != 0) {\r
    line_to_r = vcounts[z80stopCycle>>8]+1;\r
    z80stopCycle = 0;\r
  }\r
\r
  if(PicoOpt&1) {\r
    // we have ym2612 enabled, so we have to run Z80 in lines, so we could update DAC and timers\r
    for(; line < line_to; line++) {\r
      sound_timers_and_dac(line);\r
      if((line == 224 || line == line_sample) && PsndOut) getSamples(line);\r
      if(line == 32 && PsndOut) emustatus &= ~1;\r
      if(line >= line_from_r && line < line_to_r)\r
        z80_run(228);\r
    }\r
  } else if(line_to_r-line_from_r > 0) {\r
    z80_run(228*(line_to_r-line_from_r));\r
    // samples will be taken by caller\r
  }\r
}\r
\r
// Simple frame without H-Ints\r
static int PicoFrameSimple(void)\r
{\r
  struct PicoVideo *pv=&Pico.video;\r
  int y=0,line=0,lines=0,lines_step=0,sects;\r
  int cycles_68k_vblock,cycles_68k_block;\r
\r
  if(Pico.m.pal) {\r
    // M68k cycles/frame: 152009.78\r
    if(pv->reg[1]&8) { // 240 lines\r
      cycles_68k_block  = (int) ((double) OSC_PAL  /  7 / 50 / 312 * 15 + 0.4); // 16 sects, 16*15=240, 7308\r
      cycles_68k_vblock = (int) ((double) OSC_PAL  /  7 / 50 / 312 * 24 + 0.4); // 3 sects, 3*24=72, 35163?\r
      lines_step = 15;\r
    } else {\r
      cycles_68k_block  = (int) ((double) OSC_PAL  /  7 / 50 / 312 * 14 + 0.4); // 16*14=224\r
      cycles_68k_vblock = (int) ((double) OSC_PAL  /  7 / 50 / 312 * 22 + 0.4); // 4 sects, 4*22=88\r
      lines_step = 14;\r
    }\r
  } else {\r
    // M68k cycles/frame: 127840.71\r
    cycles_68k_block  = (int) ((double) OSC_NTSC /  7 / 60 / 262 * 14 + 0.4); // 16*14=224, 6831\r
    cycles_68k_vblock = (int) ((double) OSC_NTSC /  7 / 60 / 262 * 19 + 0.4); // 2 sects, 2*19=38, 18544\r
    lines_step = 14;\r
  }\r
\r
  Pico.m.scanline=-1;\r
\r
  SekCyclesReset();\r
\r
  if(PicoOpt&4)\r
    z80_resetCycles();\r
\r
  // 6 button pad: let's just say it timed out now\r
  Pico.m.padTHPhase[0]=Pico.m.padTHPhase[1]=0;\r
\r
  // ---- Active Scan ----\r
  pv->status&=~88; // clear V-Int, come out of vblank\r
\r
  // Run in sections:\r
  for(sects=16; sects; sects--)\r
  {\r
    if (CheckIdle()) break;\r
\r
    lines += lines_step;\r
    SekRun(cycles_68k_block);\r
\r
    PicoRunZ80Simple(line, lines);\r
    line=lines;\r
  }\r
\r
  // run Z80 for remaining sections\r
  if(sects) {\r
    int c = sects*cycles_68k_block;\r
\r
    lines += sects*lines_step;\r
    PicoRunZ80Simple(line, lines);\r
    // this is for approriate line counter, etc\r
    SekCycleCnt += c;\r
    SekCycleAim += c;\r
  }\r
\r
  // here we render sound if ym2612 is disabled\r
  if(!(PicoOpt&1) && PsndOut) {\r
    sound_render(0, PsndLen);\r
    if(PicoWriteSound) PicoWriteSound();\r
    // clear sound buffer\r
    memset(PsndOut, 0, (PicoOpt & 8) ? (PsndLen<<2) : (PsndLen<<1));\r
  }\r
\r
  // render screen\r
  if(!PicoSkipFrame) {\r
    if(!(PicoOpt&0x10))\r
      // Draw the screen\r
#if CAN_HANDLE_240_LINES\r
      if(pv->reg[1]&8) {\r
        for (y=0;y<240;y++) PicoLine(y);\r
      } else {\r
        for (y=0;y<224;y++) PicoLine(y);\r
      }\r
#else\r
      for (y=0;y<224;y++) PicoLine(y);\r
#endif\r
    else PicoFrameFull();\r
  }\r
\r
  // ---- V-Blanking period ----\r
  // fix line counts\r
  if(Pico.m.pal) {\r
    if(pv->reg[1]&8) { // 240 lines\r
      lines = line = 240;\r
      sects = 3;\r
      lines_step = 24;\r
    } else {\r
      lines = line = 224;\r
      sects = 4;\r
      lines_step = 22;\r
    }\r
  } else {\r
    lines = line = 224;\r
    sects = 2;\r
    lines_step = 19;\r
  }\r
\r
  //dprintf("vint: @ %06x [%i]", SekPc, SekCycleCnt);\r
  pv->pending_ints|=0x20;\r
  if (pv->reg[1]&0x20) SekInterrupt(6); // Set IRQ\r
  pv->status|=0x88; // V-Int happened / go into vblank\r
  if(Pico.m.z80Run && (PicoOpt&4)) // ?\r
    z80_int();\r
\r
  while(sects) {\r
    lines += lines_step;\r
\r
    SekRun(cycles_68k_vblock);\r
\r
    PicoRunZ80Simple(line, lines);\r
    line=lines;\r
\r
    sects--;\r
    if(sects && CheckIdle()) break;\r
  }\r
\r
  // run Z80 for remaining sections\r
  if(sects) {\r
    lines += sects*lines_step;\r
    PicoRunZ80Simple(line, lines);\r
  }\r
\r
  return 0;\r
}\r
\r
int PicoFrame(void)\r
{\r
  int acc;\r
\r
  if (PicoMCD & 1) {\r
    PicoFrameMCD();\r
    return 0;\r
  }\r
\r
  // be accurate if we are asked for this\r
  if(PicoOpt&0x40) acc=1;\r
  // don't be accurate in alternative render mode, as hint effects will not be rendered anyway\r
  else if(PicoOpt&0x10) acc = 0;\r
  else acc=Pico.video.reg[0]&0x10; // be accurate if hints are used\r
\r
  //if(Pico.video.reg[12]&0x2) Pico.video.status ^= 0x10; // change odd bit in interlace mode\r
\r
  if(!(PicoOpt&0x10))\r
    PicoFrameStart();\r
\r
  if(acc)\r
       PicoFrameHints();\r
  else PicoFrameSimple();\r
\r
  return 0;\r
}\r
\r
static int DefaultCram(int cram)\r
{\r
  int high=0x0841;\r
  // Convert 0000bbbb ggggrrrr\r
  // to      rrrr1ggg g10bbbb1\r
  high|=(cram&0x00f)<<12; // Red\r
  high|=(cram&0x0f0)<< 3; // Green\r
  high|=(cram&0xf00)>> 7; // Blue\r
  return high;\r
}\r
\r
// Function to convert Megadrive Cram into a native colour:\r
int (*PicoCram)(int cram)=DefaultCram;\r
\r
#if defined(__DEBUG_PRINT) || defined(WIN32)\r
// tmp debug: dump some stuff\r
#define bit(r, x) ((r>>x)&1)\r
void z80_debug(char *dstr);\r
char *debugString()\r
{\r
#if 1\r
  static char dstr[1024];\r
  unsigned char *reg=Pico.video.reg, r;\r
\r
  // dump some info\r
  sprintf(dstr, "mode set 1: %02x\n", (r=reg[0]));\r
  sprintf(dstr, "%sdisplay_disable: %i, M3: %i, palette: %i, ?, hints: %i\n\n", dstr, bit(r,0), bit(r,1), bit(r,2), bit(r,4));\r
  sprintf(dstr, "%smode set 2: %02x\n",  dstr,  (r=reg[1]));\r
  sprintf(dstr, "%sSMS/genesis: %i, pal: %i, dma: %i, vints: %i, disp: %i, TMS9918: %i\n\n",dstr, bit(r,2), bit(r,3), bit(r,4), bit(r,5), bit(r,6), bit(r,7));\r
  sprintf(dstr, "%smode set 3: %02x\n",  dstr,  (r=reg[0xB]));\r
  sprintf(dstr, "%sLSCR: %i, HSCR: %i, 2cell vscroll: %i, IE2: %i\n\n", dstr, bit(r,0), bit(r,1), bit(r,2), bit(r,3));\r
  sprintf(dstr, "%smode set 4: %02x\n",  dstr,  (r=reg[0xC]));\r
  sprintf(dstr, "%sinterlace: %i%i; cells: %i; shadow: %i\n\n", dstr, bit(r,2), bit(r,1), (r&0x80) ? 40 : 32,  bit(r,3));\r
  sprintf(dstr, "%sscroll size: w: %i; h: %i\n\n",  dstr, reg[0x10]&3, (reg[0x10]&0x30)>>4);\r
  sprintf(dstr, "%sSRAM: det: %i; eeprom: %i\n",  dstr, bit(Pico.m.sram_reg, 4), bit(Pico.m.sram_reg, 2));\r
  sprintf(dstr, "%sCPU state: PC: %06x cycles: %i\n", dstr, SekPc, SekCyclesDoneT());\r
#ifdef EMU_C68K\r
  for(r=0; r < 8; r++)\r
    sprintf(dstr, "%sd%i=%08x, a%i=%08x\n", dstr, r, PicoCpu.d[r], r, PicoCpu.a[r]);\r
#endif\r
  z80_debug(dstr);\r
\r
#else\r
  struct PicoVideo *pvid=&Pico.video;\r
  int table=0;\r
  int i,u,n,link=0;\r
  static char dstr[1024*8];\r
  dstr[0] = 0;\r
\r
  table=pvid->reg[5]&0x7f;\r
  if (pvid->reg[12]&1) table&=0x7e; // Lowest bit 0 in 40-cell mode\r
  table<<=8; // Get sprite table address/2\r
\r
  for (i=u=n=0; u < 80 && n < 20; u++)\r
  {\r
    unsigned int *sprite;\r
    int code, code2, sx, sy, height;\r
\r
    sprite=(unsigned int *)(Pico.vram+((table+(link<<2))&0x7ffc)); // Find sprite\r
\r
    // get sprite info\r
    code = sprite[0];\r
\r
    // check if it is on this line\r
    sy = (code&0x1ff);//-0x80;\r
    height = ((code>>24)&3)+1;\r
\r
    // masking sprite?\r
    code2 = sprite[1];\r
    sx = (code2>>16)&0x1ff;\r
\r
    dprintf("#%02i x: %03i y: %03i %ix%i", u, sx, sy, ((code>>26)&3)+1, height);\r
\r
    link=(code>>16)&0x7f;\r
    if(!link) break; // End of sprites\r
  }\r
#endif\r
\r
#if 0\r
  {\r
    FILE *f = fopen("zram", "wb");\r
    fwrite(Pico.zram, 1, 0x2000, f);\r
    fclose(f);\r
  }\r
#endif\r
\r
  return dstr;\r
}\r
#endif\r