X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=Pico%2FPico.c;h=6d0bfdd6664928b682211275932878c8e363d0de;hb=1832075ec7b43b166a9d5f83753832a05e7d4239;hp=c47cf19002dc87c8a9aa063c4a58993de45ba602;hpb=48df6e9e54f7c11263f5462f960b8cc2ecdc52e4;p=picodrive.git

diff --git a/Pico/Pico.c b/Pico/Pico.c
index c47cf19..6d0bfdd 100644
--- a/Pico/Pico.c
+++ b/Pico/Pico.c
@@ -12,20 +12,19 @@
 
 int PicoVer=0x0133;
 struct Pico Pico;
-int PicoOpt=0; // disable everything by default
-int PicoSkipFrame=0; // skip rendering frame?
+int PicoOpt = 0;
+int PicoSkipFrame = 0; // skip rendering frame?
+int emustatus = 0;     // rapid_ym2612, multi_ym_updates
+int PicoPad[2];        // Joypads, format is SACB RLDU
+int PicoAHW = 0;       // active addon hardware: scd_active, 32x_active, svp_active, pico_active
 int PicoRegionOverride = 0; // override the region detection 0: Auto, 1: Japan NTSC, 2: Japan PAL, 4: US, 8: Europe
 int PicoAutoRgnOrder = 0;
-int emustatus = 0; // rapid_ym2612, multi_ym_updates
+struct PicoSRAM SRam = {0,};
+
 void (*PicoWriteSound)(int len) = NULL; // called at the best time to send sound buffer (PsndOut) to hardware
 void (*PicoResetHook)(void) = NULL;
 void (*PicoLineHook)(int count) = NULL;
 
-struct PicoSRAM SRam = {0,};
-int z80startCycle, z80stopCycle; // in 68k cycles
-int PicoPad[2];  // Joypads, format is SACB RLDU
-int PicoMCD = 0; // mega CD status: scd_started
-
 // to be called once on emu init
 int PicoInit(void)
 {
@@ -48,56 +47,51 @@ int PicoInit(void)
 // to be called once on emu exit
 void PicoExit(void)
 {
-  if (PicoMCD&1)
+  if (PicoAHW & PAHW_MCD)
     PicoExitMCD();
   z80_exit();
 
-  if(SRam.data) free(SRam.data); SRam.data=0;
+  if (SRam.data) free(SRam.data); SRam.data=0;
 }
 
-int PicoReset(int hard)
+void PicoPower(void)
 {
-  unsigned int region=0;
-  int support=0,hw=0,i=0;
-  unsigned char pal=0;
   unsigned char sram_reg=Pico.m.sram_reg; // must be preserved
 
-  if (Pico.romsize<=0) return 1;
-
-  PicoMemReset();
-  SekReset();
-  // s68k doesn't have the TAS quirk, so we just globally set normal TAS handler in MCD mode (used by Batman games).
-  SekSetRealTAS(PicoMCD & 1);
-  SekCycleCntT=0;
-  z80_reset();
+  // clear all memory of the emulated machine
+  memset(&Pico.ram,0,(unsigned int)&Pico.rom-(unsigned int)&Pico.ram);
 
-  // reset VDP state, VRAM and PicoMisc
-  //memset(&Pico.video,0,sizeof(Pico.video));
-  //memset(&Pico.vram,0,sizeof(Pico.vram));
-  memset(Pico.ioports,0,sizeof(Pico.ioports)); // needed for MCD to reset properly
+  memset(&Pico.video,0,sizeof(Pico.video));
   memset(&Pico.m,0,sizeof(Pico.m));
-  Pico.video.pending_ints=0;
-  emustatus = 0;
 
-  if(hard) {
-    // clear all memory of the emulated machine
-    memset(&Pico.ram,0,(unsigned int)&Pico.rom-(unsigned int)&Pico.ram);
-  }
+  Pico.video.pending_ints=0;
+  z80_reset();
 
   // default VDP register values (based on Fusion)
   Pico.video.reg[0] = Pico.video.reg[1] = 0x04;
   Pico.video.reg[0xc] = 0x81;
   Pico.video.reg[0xf] = 0x02;
-  Pico.m.dirtyPal = 1;
 
-  if(PicoRegionOverride)
+  if (PicoAHW & PAHW_MCD)
+    PicoPowerMCD();
+
+  Pico.m.sram_reg=sram_reg;
+  PicoReset();
+}
+
+PICO_INTERNAL void PicoDetectRegion(void)
+{
+  int support=0, hw=0, i;
+  unsigned char pal=0;
+
+  if (PicoRegionOverride)
   {
     support = PicoRegionOverride;
   }
   else
   {
     // Read cartridge region data:
-    region=PicoRead32(0x1f0);
+    int region=PicoRead32(0x1f0);
 
     for (i=0;i<4;i++)
     {
@@ -138,14 +132,44 @@ int PicoReset(int hard)
 
   Pico.m.hardware=(unsigned char)(hw|0x20); // No disk attached
   Pico.m.pal=pal;
-  Pico.video.status = 0x3408 | pal; // always set bits | vblank | pal
+}
 
-  PsndReset(); // pal must be known here
+int PicoReset(void)
+{
+  unsigned char sram_reg=Pico.m.sram_reg; // must be preserved
+
+  if (Pico.romsize<=0) return 1;
 
+  /* must call now, so that banking is reset, and correct vectors get fetched */
   if (PicoResetHook) PicoResetHook();
 
-  if (PicoMCD & 1) {
-    PicoResetMCD(hard);
+  PicoMemReset();
+  SekReset();
+  // s68k doesn't have the TAS quirk, so we just globally set normal TAS handler in MCD mode (used by Batman games).
+  SekSetRealTAS(PicoAHW & PAHW_MCD);
+  SekCycleCntT=0;
+
+  if (PicoAHW & PAHW_MCD)
+    // needed for MCD to reset properly, probably some bug hides behind this..
+    memset(Pico.ioports,0,sizeof(Pico.ioports));
+  emustatus = 0;
+
+  Pico.m.dirtyPal = 1;
+
+  Pico.m.z80_bank68k = 0;
+  memset(Pico.zram, 0, sizeof(Pico.zram)); // ??
+
+  PicoDetectRegion();
+  Pico.video.status = 0x3428 | Pico.m.pal; // 'always set' bits | vblank | collision | pal
+
+  PsndReset(); // pal must be known here
+
+  // create an empty "dma" to cause 68k exec start at random frame location
+  if (Pico.m.dma_xfers == 0 && !(PicoOpt&POPT_DIS_VDP_FIFO))
+    Pico.m.dma_xfers = rand() & 0x1fff;
+
+  if (PicoAHW & PAHW_MCD) {
+    PicoResetMCD();
     return 0;
   }
 
@@ -243,12 +267,12 @@ static __inline void SekStep(void)
 
 static int CheckIdle(void)
 {
-  int i, state[0x22];
+  int i, state[0x24];
 
   // See if the state is the same after 2 steps:
-  SekState(state); SekStep(); SekStep(); SekState(state+0x11);
-  for (i = 0x10; i >= 0; i--)
-    if (state[i] != state[i+0x11]) return 0;
+  SekState(state); SekStep(); SekStep(); SekState(state+0x12);
+  for (i = 0x11; i >= 0; i--)
+    if (state[i] != state[i+0x12]) return 0;
 
   return 1;
 }
@@ -285,64 +309,60 @@ static __inline void getSamples(int y)
 
 #include "PicoFrameHints.c"
 
-// helper z80 runner. Runs only if z80 is enabled at this point
-// (z80WriteBusReq will handle the rest)
-static void PicoRunZ80Simple(int line_from, int line_to)
+
+int z80stopCycle;
+int z80_cycle_cnt;        /* 'done' z80 cycles before z80_run() */
+int z80_cycle_aim;
+int z80_scanline;
+int z80_scanline_cycles;  /* cycles done until z80_scanline */
+
+/* sync z80 to 68k */
+PICO_INTERNAL void PicoSyncZ80(int m68k_cycles_done)
 {
-  int line_from_r=line_from, line_to_r=line_to, line=0;
-  int line_sample = Pico.m.pal ? 68 : 93;
-
-  if (!(PicoOpt&4) || Pico.m.z80Run == 0) line_to_r = 0;
-  else {
-    extern const unsigned short vcounts[];
-    if (z80startCycle) {
-      line = vcounts[z80startCycle>>8];
-      if (line > line_from)
-        line_from_r = line;
-    }
-    z80startCycle = SekCyclesDone();
-  }
+  int cnt;
+  z80_cycle_aim = cycles_68k_to_z80(m68k_cycles_done);
+  cnt = z80_cycle_aim - z80_cycle_cnt;
 
-  if (PicoOpt&1) {
-    // we have ym2612 enabled, so we have to run Z80 in lines, so we could update DAC and timers
-    for (line = line_from; line < line_to; line++) {
-      Psnd_timers_and_dac(line);
-      if ((line == 224 || line == line_sample) && PsndOut) getSamples(line);
-      if (line == 32 && PsndOut) emustatus &= ~1;
-      if (line >= line_from_r && line < line_to_r)
-        z80_run_nr(228);
-    }
-  } else if (line_to_r-line_from_r > 0) {
-    z80_run_nr(228*(line_to_r-line_from_r));
-    // samples will be taken by caller
-  }
+  elprintf(EL_BUSREQ, "z80 sync %i (%i|%i -> %i|%i)", cnt, z80_cycle_cnt, z80_cycle_cnt / 228,
+    z80_cycle_aim, z80_cycle_aim / 228);
+
+  if (cnt > 0)
+    z80_cycle_cnt += z80_run(cnt);
 }
 
+
 // Simple frame without H-Ints
 static int PicoFrameSimple(void)
 {
   struct PicoVideo *pv=&Pico.video;
-  int y=0,line=0,lines=0,lines_step=0,sects;
+  int y=0,lines_step=0,sects,line_last;
   int cycles_68k_vblock,cycles_68k_block;
 
   // split to 16 run calls for active scan, for vblank split to 2 (ntsc), 3 (pal 240), 4 (pal 224)
-  if (Pico.m.pal && (pv->reg[1]&8)) {
+  if (Pico.m.pal)
+  {
     if(pv->reg[1]&8) { // 240 lines
-      cycles_68k_block  = 7329;  // (488*240+148)/16.0, -4
-      cycles_68k_vblock = 11640; // (72*488-148-68)/3.0, 0
+      cycles_68k_block  = 7308;
+      cycles_68k_vblock = 11694;
       lines_step = 15;
     } else {
-      cycles_68k_block  = 6841;  // (488*224+148)/16.0, -4
-      cycles_68k_vblock = 10682; // (88*488-148-68)/4.0, 0
+      cycles_68k_block  = 6821;
+      cycles_68k_vblock = 10719;
       lines_step = 14;
     }
+    line_last = 312-1;
   } else {
     // M68k cycles/frame: 127840.71
     cycles_68k_block  = 6841; // (488*224+148)/16.0, -4
     cycles_68k_vblock = 9164; // (38*488-148-68)/2.0, 0
     lines_step = 14;
+    line_last = 262-1;
   }
 
+  // a hack for VR, to get it running in fast mode
+  if (PicoAHW & PAHW_SVP)
+    Pico.ram[0xd864^1] = 0x1a;
+
   // we don't emulate DMA timing in this mode
   if (Pico.m.dma_xfers) {
     Pico.m.dma_xfers=0;
@@ -354,9 +374,11 @@ static int PicoFrameSimple(void)
   Pico.video.status|=0x200;
 
   Pico.m.scanline=-1;
-  z80startCycle=0;
+  PsndDacLine = 0;
 
   SekCyclesReset();
+  z80_resetCycles();
+  timers_cycle();
 
   // 6 button pad: let's just say it timed out now
   Pico.m.padTHPhase[0]=Pico.m.padTHPhase[1]=0;
@@ -365,35 +387,35 @@ static int PicoFrameSimple(void)
   pv->status&=~0x88; // clear V-Int, come out of vblank
 
   // Run in sections:
-  for(sects=16; sects; sects--)
+  for (sects=16; sects; sects--)
   {
     if (CheckIdle()) break;
 
-    lines += lines_step;
     SekRunM68k(cycles_68k_block);
-
-    PicoRunZ80Simple(line, lines);
     if (PicoLineHook) PicoLineHook(lines_step);
-    line=lines;
   }
 
-  // run Z80 for remaining sections
-  if(sects) {
-    int c = sects*cycles_68k_block;
-
-    // this "run" is for approriate line counter, etc
-    SekCycleCnt += c;
-    SekCycleAim += c;
+  // do remaining sections without 68k
+  if (sects) {
+    SekCycleCnt += sects * cycles_68k_block;
+    SekCycleAim += sects * cycles_68k_block;
 
-    lines += sects*lines_step;
-    PicoRunZ80Simple(line, lines);
     if (PicoLineHook) PicoLineHook(sects*lines_step);
   }
 
+  // another hack for VR (it needs hints to work)
+  if (PicoAHW & PAHW_SVP) {
+    Pico.ram[0xd864^1] = 1;
+    pv->pending_ints|=0x10;
+    if (pv->reg[0]&0x10) SekInterrupt(4);
+    SekRunM68k(160);
+  }
+
   // render screen
   if (!PicoSkipFrame)
   {
-    if (!(PicoOpt&0x10))
+    if (!(PicoOpt&POPT_ALT_RENDERER))
+    {
       // Draw the screen
 #if CAN_HANDLE_240_LINES
       if (pv->reg[1]&8) {
@@ -404,67 +426,74 @@ static int PicoFrameSimple(void)
 #else
       for (y=0;y<224;y++) PicoLine(y);
 #endif
+    }
     else PicoFrameFull();
 #ifdef DRAW_FINISH_FUNC
     DRAW_FINISH_FUNC();
 #endif
   }
 
-  // here we render sound if ym2612 is disabled
-  if (!(PicoOpt&1) && PsndOut) {
-    int len = PsndRender(0, PsndLen);
-    if (PicoWriteSound) PicoWriteSound(len);
-    // clear sound buffer
-    PsndClear();
-  }
-
   // a gap between flags set and vint
   pv->pending_ints|=0x20;
   pv->status|=8; // go into vblank
   SekRunM68k(68+4);
 
+  if (Pico.m.z80Run && (PicoOpt&POPT_EN_Z80))
+    PicoSyncZ80(SekCycleCnt);
+
+  // render sound
+  if (PsndOut)
+  {
+    int len;
+    if (ym2612.dacen && PsndDacLine <= lines_step*16)
+      PsndDoDAC(lines_step*16);
+    len = PsndRender(0, PsndLen);
+    if (PicoWriteSound) PicoWriteSound(len);
+    // clear sound buffer
+    PsndClear();
+  }
+
   // ---- V-Blanking period ----
   // fix line counts
   if(Pico.m.pal) {
     if(pv->reg[1]&8) { // 240 lines
-      lines = line = 240;
       sects = 3;
       lines_step = 24;
     } else {
-      lines = line = 224;
       sects = 4;
       lines_step = 22;
     }
   } else {
-    lines = line = 224;
     sects = 2;
     lines_step = 19;
   }
 
   if (pv->reg[1]&0x20) SekInterrupt(6); // Set IRQ
-  if (Pico.m.z80Run && (PicoOpt&4))
+  if (Pico.m.z80Run && (PicoOpt&POPT_EN_Z80))
     z80_int();
 
-  while (sects) {
-    lines += lines_step;
-
+  while (1)
+  {
     SekRunM68k(cycles_68k_vblock);
-
-    PicoRunZ80Simple(line, lines);
     if (PicoLineHook) PicoLineHook(lines_step);
-    line=lines;
 
     sects--;
-    if (sects && CheckIdle()) break;
+    if (sects == 0) break;
+    if (CheckIdle()) break;
   }
 
-  // run Z80 for remaining sections
   if (sects) {
-    lines += sects*lines_step;
-    PicoRunZ80Simple(line, lines);
+    SekCycleCnt += sects * cycles_68k_vblock;
+    SekCycleAim += sects * cycles_68k_vblock;
     if (PicoLineHook) PicoLineHook(sects*lines_step);
   }
 
+  // must sync z80 before return, and extend last DAC sample
+  if (Pico.m.z80Run && (PicoOpt&POPT_EN_Z80))
+    PicoSyncZ80(SekCycleCnt);
+  if (PsndOut && ym2612.dacen && PsndDacLine <= line_last)
+    PsndDoDAC(line_last);
+
   return 0;
 }
 
@@ -474,23 +503,23 @@ int PicoFrame(void)
 
   Pico.m.frame_count++;
 
-  if (PicoMCD & 1) {
+  if (PicoAHW & PAHW_MCD) {
     PicoFrameMCD();
     return 0;
   }
 
   // be accurate if we are asked for this
-  if(PicoOpt&0x40) acc=1;
+  if (PicoOpt&POPT_ACC_TIMING) acc=1;
   // don't be accurate in alternative render mode, as hint effects will not be rendered anyway
-  else if(PicoOpt&0x10) acc = 0;
+  else if (PicoOpt&POPT_ALT_RENDERER) acc = 0;
   else acc=Pico.video.reg[0]&0x10; // be accurate if hints are used
 
   //if(Pico.video.reg[12]&0x2) Pico.video.status ^= 0x10; // change odd bit in interlace mode
 
-  if(!(PicoOpt&0x10))
+  if (!(PicoOpt&POPT_ALT_RENDERER))
     PicoFrameStart();
 
-  if(acc)
+  if (acc)
        PicoFrameHints();
   else PicoFrameSimple();
 
@@ -504,22 +533,21 @@ void PicoFrameDrawOnly(void)
   for (y=0;y<224;y++) PicoLine(y);
 }
 
-int PicoGetStat(pstat_t which)
+void PicoGetInternal(pint_t which, pint_ret_t *r)
 {
   switch (which)
   {
-    case PS_PAL:       return Pico.m.pal;
-    case PS_40_CELL:   return Pico.video.reg[12]&1;
-    case PS_240_LINES: return Pico.m.pal && (Pico.video.reg[1]&8);
+    case PI_ROM:         r->vptr = Pico.rom; break;
+    case PI_ISPAL:       r->vint = Pico.m.pal; break;
+    case PI_IS40_CELL:   r->vint = Pico.video.reg[12]&1; break;
+    case PI_IS240_LINES: r->vint = Pico.m.pal && (Pico.video.reg[1]&8); break;
   }
-  return 0;
 }
 
 // callback to output message from emu
 void (*PicoMessage)(const char *msg)=NULL;
 
 #if 1 // defined(__DEBUG_PRINT)
-// tmp debug: dump some stuff
 #define bit(r, x) ((r>>x)&1)
 void z80_debug(char *dstr);
 char *debugString(void)