X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=Pico%2FPico.c;h=7fa152ab9e00770d71e3c9bb466ad1bc17e2cf3d;hb=583ab72c0b42549235191fd4fad239074dd896af;hp=93d6876460f887e3fa5624e724b9fdd7889865eb;hpb=0ffefdb8bd172c258497ce0cd14d1f2ea1358f69;p=picodrive.git

diff --git a/Pico/Pico.c b/Pico/Pico.c
index 93d6876..7fa152a 100644
--- a/Pico/Pico.c
+++ b/Pico/Pico.c
@@ -12,20 +12,20 @@
 
 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
 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
+int z80startCycle, z80stopCycle; // in 68k cycles
+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)
 {
@@ -38,6 +38,7 @@ int PicoInit(void)
   z80_init(); // init even if we aren't going to use it
 
   PicoInitMCD();
+  PicoSVPInit();
 
   SRam.data=0;
 
@@ -47,14 +48,39 @@ 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 char sram_reg=Pico.m.sram_reg; // must be preserved
+
+  // clear all memory of the emulated machine
+  memset(&Pico.ram,0,(unsigned int)&Pico.rom-(unsigned int)&Pico.ram);
+
+  memset(&Pico.video,0,sizeof(Pico.video));
+  memset(&Pico.m,0,sizeof(Pico.m));
+
+  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;
+
+  if (PicoAHW & PAHW_MCD)
+    PicoPowerMCD();
+
+  Pico.m.sram_reg=sram_reg;
+  PicoReset();
+}
+
+int PicoReset(void)
 {
   unsigned int region=0;
   int support=0,hw=0,i=0;
@@ -63,30 +89,20 @@ int PicoReset(int hard)
 
   if (Pico.romsize<=0) return 1;
 
+  /* must call now, so that banking is reset, and correct vectors get fetched */
+  if (PicoResetHook) PicoResetHook();
+
   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);
+  SekSetRealTAS(PicoAHW & PAHW_MCD);
   SekCycleCntT=0;
-  z80_reset();
 
-  // 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.m,0,sizeof(Pico.m));
-  Pico.video.pending_ints=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;
 
-  if(hard) {
-    // clear all memory of the emulated machine
-    memset(&Pico.ram,0,(unsigned int)&Pico.rom-(unsigned int)&Pico.ram);
-  }
-
-  // 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)
@@ -137,14 +153,16 @@ 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
+  Pico.video.status = 0x3408 | pal; // 'always set' bits | vblank | pal
 
   PsndReset(); // pal must be known here
 
-  if (PicoResetHook) PicoResetHook();
+  // 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 (PicoMCD & 1) {
-    PicoResetMCD(hard);
+  if (PicoAHW & PAHW_MCD) {
+    PicoResetMCD();
     return 0;
   }
 
@@ -161,15 +179,16 @@ int PicoReset(int hard)
 
 // dma2vram settings are just hacks to unglitch Legend of Galahad (needs <= 104 to work)
 // same for Outrunners (92-121, when active is set to 24)
+// 96 is VR hack
 static const int dma_timings[] = {
-83,  167, 166,  83, // vblank: 32cell: dma2vram dma2[vs|c]ram vram_fill vram_copy
+96,  167, 166,  83, // vblank: 32cell: dma2vram dma2[vs|c]ram vram_fill vram_copy
 102, 205, 204, 102, // vblank: 40cell:
 16,   16,  15,   8, // active: 32cell:
 24,   18,  17,   9  // ...
 };
 
 static const int dma_bsycles[] = {
-(488<<8)/82,  (488<<8)/167, (488<<8)/166, (488<<8)/83,
+(488<<8)/96,  (488<<8)/167, (488<<8)/166, (488<<8)/83,
 (488<<8)/102, (488<<8)/205, (488<<8)/204, (488<<8)/102,
 (488<<8)/16,  (488<<8)/16,  (488<<8)/15,  (488<<8)/8,
 (488<<8)/24,  (488<<8)/18,  (488<<8)/17,  (488<<8)/9
@@ -241,12 +260,12 @@ 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;
 }
@@ -255,6 +274,12 @@ static int CheckIdle(void)
 // to be called on 224 or line_sample scanlines only
 static __inline void getSamples(int y)
 {
+#if SIMPLE_WRITE_SOUND
+  if (y != 224) return;
+  PsndRender(0, PsndLen);
+  if (PicoWriteSound) PicoWriteSound(PsndLen);
+  PsndClear();
+#else
   static int curr_pos = 0;
 
   if(y == 224) {
@@ -271,6 +296,7 @@ static __inline void getSamples(int y)
     emustatus&=~1;
     curr_pos = PsndRender(0, PsndLen/2);
   }
+#endif
 }
 
 
@@ -283,7 +309,7 @@ static void PicoRunZ80Simple(int line_from, int line_to)
   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;
+  if (!(PicoOpt&POPT_EN_Z80) || Pico.m.z80Run == 0) line_to_r = 0;
   else {
     extern const unsigned short vcounts[];
     if (z80startCycle) {
@@ -294,7 +320,7 @@ static void PicoRunZ80Simple(int line_from, int line_to)
     z80startCycle = SekCyclesDone();
   }
 
-  if (PicoOpt&1) {
+  if (PicoOpt&POPT_EN_FM) {
     // 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);
@@ -334,6 +360,10 @@ static int PicoFrameSimple(void)
     lines_step = 14;
   }
 
+  // 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;
@@ -381,10 +411,19 @@ static int PicoFrameSimple(void)
     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) {
@@ -395,6 +434,7 @@ static int PicoFrameSimple(void)
 #else
       for (y=0;y<224;y++) PicoLine(y);
 #endif
+    }
     else PicoFrameFull();
 #ifdef DRAW_FINISH_FUNC
     DRAW_FINISH_FUNC();
@@ -402,7 +442,7 @@ static int PicoFrameSimple(void)
   }
 
   // here we render sound if ym2612 is disabled
-  if (!(PicoOpt&1) && PsndOut) {
+  if (!(PicoOpt&POPT_EN_FM) && PsndOut) {
     int len = PsndRender(0, PsndLen);
     if (PicoWriteSound) PicoWriteSound(len);
     // clear sound buffer
@@ -433,10 +473,11 @@ static int PicoFrameSimple(void)
   }
 
   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) {
+  while (sects)
+  {
     lines += lines_step;
 
     SekRunM68k(cycles_68k_vblock);
@@ -465,23 +506,23 @@ 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();
 
@@ -495,6 +536,17 @@ void PicoFrameDrawOnly(void)
   for (y=0;y<224;y++) PicoLine(y);
 }
 
+int PicoGetStat(pstat_t which)
+{
+  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);
+  }
+  return 0;
+}
+
 // callback to output message from emu
 void (*PicoMessage)(const char *msg)=NULL;