[picodrive.git] / Pico / cd / Pico.c

// This is part of Pico Library

// (c) Copyright 2004 Dave, All rights reserved.
// (c) Copyright 2007 notaz, All rights reserved.
// Free for non-commercial use.

// For commercial use, separate licencing terms must be obtained.


#include "../PicoInt.h"
#include "../sound/sound.h"


static int counter75hz = 0; // TODO: move 2 context


int PicoInitMCD(void)
{
  SekInitS68k();
  Init_CD_Driver();

  return 0;
}


void PicoExitMCD(void)
{
  End_CD_Driver();
}

int PicoResetMCD(int hard)
{
  // clear everything except BIOS
  memset(Pico_mcd->prg_ram, 0, sizeof(mcd_state) - sizeof(Pico_mcd->bios));
  *(unsigned int *)(Pico_mcd->bios + 0x70) = 0xffffffff; // reset hint vector (simplest way to implement reg6)
  PicoMCD |= 2; // s68k reset pending. TODO: move
  Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode with m68k access after reset
  counter75hz = 0;

  LC89510_Reset();
  Reset_CD();

  return 0;
}

static __inline void SekRun(int cyc)
{
  int cyc_do;
  SekCycleAim+=cyc;
  if((cyc_do=SekCycleAim-SekCycleCnt) < 0) return;
#if defined(EMU_C68K)
  PicoCpu.cycles=cyc_do;
  CycloneRun(&PicoCpu);
  SekCycleCnt+=cyc_do-PicoCpu.cycles;
#elif defined(EMU_M68K)
  m68k_set_context(&PicoM68kCPU);
  SekCycleCnt+=m68k_execute(cyc_do);
#endif
}

static __inline void SekRunS68k(int cyc)
{
  int cyc_do;
  SekCycleAimS68k+=cyc;
  if((cyc_do=SekCycleAimS68k-SekCycleCntS68k) < 0) return;
#if defined(EMU_C68K)
  PicoCpuS68k.cycles=cyc_do;
  CycloneRun(&PicoCpuS68k);
  SekCycleCntS68k+=cyc_do-PicoCpuS68k.cycles;
#elif defined(EMU_M68K)
  m68k_set_context(&PicoS68kCPU);
  SekCycleCntS68k+=m68k_execute(cyc_do);
#endif
}

static __inline void check_cd_dma(void)
{
	int ddx;

	if (!(Pico_mcd->scd.Status_CDC & 0x08)) return;

	ddx = Pico_mcd->s68k_regs[4] & 7;
	if (ddx <  2) return; // invalid
	if (ddx <  4) {
		Pico_mcd->s68k_regs[4] |= 0x40; // Data set ready in host port
		return;
	}
	if (ddx == 6) return; // invalid

	Update_CDC_TRansfer(ddx); // now go and do the actual transfer
}

// to be called on 224 or line_sample scanlines only
static __inline void getSamples(int y)
{
  if(y == 224) {
    //dprintf("sta%i: %i [%i]", (emustatus & 2), emustatus, y);
    if(emustatus & 2)
        sound_render(PsndLen/2, PsndLen-PsndLen/2);
    else sound_render(0, PsndLen);
    if (emustatus&1) emustatus|=2; else emustatus&=~2;
    if (PicoWriteSound) PicoWriteSound();
    // clear sound buffer
    memset(PsndOut, 0, (PicoOpt & 8) ? (PsndLen<<2) : (PsndLen<<1));
  }
  else if(emustatus & 3) {
    emustatus|= 2;
    emustatus&=~1;
    sound_render(0, PsndLen/2);
  }
}


// Accurate but slower frame which does hints
static int PicoFrameHintsMCD(void)
{
  struct PicoVideo *pv=&Pico.video;
  int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample,counter75hz_lim;
  const int cycles_68k=488,cycles_z80=228,cycles_s68k=795; // both PAL and NTSC compile to same values
  int skip=PicoSkipFrame || (PicoOpt&0x10);
  int hint; // Hint counter

  if(Pico.m.pal) { //
    //cycles_68k = (int) ((double) OSC_PAL  /  7 / 50 / 312 + 0.4); // should compile to a constant (488)
    //cycles_z80 = (int) ((double) OSC_PAL  / 15 / 50 / 312 + 0.4); // 228
    lines  = 312;    // Steve Snake says there are 313 lines, but this seems to also work well
    line_sample = 68;
    counter75hz_lim = 2080;
    if(pv->reg[1]&8) lines_vis = 240;
  } else {
    //cycles_68k = (int) ((double) OSC_NTSC /  7 / 60 / 262 + 0.4); // 488
    //cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228
    lines  = 262;
    counter75hz_lim = 2096;
    line_sample = 93;
  }

  SekCyclesReset();
  SekCyclesResetS68k();
  //z80ExtraCycles = 0;

  if(PicoOpt&4)
    z80CycleAim = 0;
//    z80_resetCycles();

  pv->status&=~0x88; // clear V-Int, come out of vblank

  hint=pv->reg[10]; // Load H-Int counter
  //dprintf("-hint: %i", hint);

  for (y=0;y<lines;y++)
  {
    Pico.m.scanline=(short)y;

    // pad delay (for 6 button pads)
    if(PicoOpt&0x20) {
      if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0;
      if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0;
    }

    check_cd_dma();

    // H-Interrupts:
    if(y <= lines_vis && --hint < 0) // y <= lines_vis: Comix Zone, Golden Axe
    {
      //dprintf("rhint:old @ %06x", SekPc);
      hint=pv->reg[10]; // Reload H-Int counter
      pv->pending_ints|=0x10;
      if (pv->reg[0]&0x10) SekInterrupt(4);
      //dprintf("rhint: %i @ %06x [%i|%i]", hint, SekPc, y, SekCycleCnt);
      //dprintf("hint_routine: %x", (*(unsigned short*)(Pico.ram+0x0B84)<<16)|*(unsigned short*)(Pico.ram+0x0B86));
    }

    // V-Interrupt:
    if (y == lines_vis)
    {
      //dprintf("vint: @ %06x [%i|%i]", SekPc, y, SekCycleCnt);
      pv->status|=0x88; // V-Int happened, go into vblank
      SekRun(128); SekCycleAim-=128; // there must be a gap between H and V ints, also after vblank bit set (Mazin Saga, Bram Stoker's Dracula)
      /*if(Pico.m.z80Run && (PicoOpt&4)) {
        z80CycleAim+=cycles_z80/2;
        total_z80+=z80_run(z80CycleAim-total_z80);
        z80CycleAim-=cycles_z80/2;
      }*/
      pv->pending_ints|=0x20;
      if(pv->reg[1]&0x20) SekInterrupt(6);
      if(Pico.m.z80Run && (PicoOpt&4)) // ?
        z80_int();
      //dprintf("zint: [%i|%i] zPC=%04x", Pico.m.scanline, SekCyclesDone(), mz80GetRegisterValue(NULL, 0));
    }

    // decide if we draw this line
#if CAN_HANDLE_240_LINES
    if(!skip && ((!(pv->reg[1]&8) && y<224) || ((pv->reg[1]&8) && y<240)) )
#else
    if(!skip && y<224)
#endif
      PicoLine(y);

    if(PicoOpt&1)
      sound_timers_and_dac(y);

    // get samples from sound chips
    if(y == 32 && PsndOut)
      emustatus &= ~1;
    else if((y == 224 || y == line_sample) && PsndOut)
      getSamples(y);

    // Run scanline:
      //dprintf("m68k starting exec @ %06x", SekPc);
    if(Pico.m.dma_bytes) SekCycleCnt+=CheckDMA();
    SekRun(cycles_68k);
    if ((Pico_mcd->m.busreq&3) == 1) { // no busreq/no reset
#if 0
	    int i;
	    FILE *f = fopen("prg_ram.bin", "wb");
	    for (i = 0; i < 0x80000; i+=2)
	    {
		    int tmp = Pico_mcd->prg_ram[i];
		    Pico_mcd->prg_ram[i] = Pico_mcd->prg_ram[i+1];
		    Pico_mcd->prg_ram[i+1] = tmp;
	    }
	    fwrite(Pico_mcd->prg_ram, 1, 0x80000, f);
	    fclose(f);
	    exit(1);
#endif
      //dprintf("s68k starting exec @ %06x", SekPcS68k);
      SekRunS68k(cycles_s68k);
    }

    if((PicoOpt&4) && Pico.m.z80Run) {
      Pico.m.z80Run|=2;
      z80CycleAim+=cycles_z80;
      total_z80+=z80_run(z80CycleAim-total_z80);
    }

    if ((counter75hz+=10) >= counter75hz_lim) {
      counter75hz -= counter75hz_lim;
      Check_CD_Command();
    }

    if (Pico_mcd->rot_comp.Reg_58 & 0x8000)
      gfx_cd_update();
  }

  // draw a frame just after vblank in alternative render mode
  if(!PicoSkipFrame && (PicoOpt&0x10))
    PicoFrameFull();

  return 0;
}


int PicoFrameMCD(void)
{
  if(!(PicoOpt&0x10))
    PicoFrameStart();

  PicoFrameHintsMCD();

  return 0;
}
Commit	Line	Data
cc68a136	1	// This is part of Pico Library
	2
	3	// (c) Copyright 2004 Dave, All rights reserved.
672ad671	4	// (c) Copyright 2007 notaz, All rights reserved.
cc68a136	5	// Free for non-commercial use.
	6
	7	// For commercial use, separate licencing terms must be obtained.
	8
	9
	10	#include "../PicoInt.h"
	11	#include "../sound/sound.h"
	12
	13
672ad671	14	static int counter75hz = 0; // TODO: move 2 context
cc68a136	15
	16
	17	int PicoInitMCD(void)
	18	{
	19	SekInitS68k();
	20	Init_CD_Driver();
	21
	22	return 0;
	23	}
	24
	25
	26	void PicoExitMCD(void)
	27	{
	28	End_CD_Driver();
	29	}
	30
	31	int PicoResetMCD(int hard)
	32	{
	33	// clear everything except BIOS
	34	memset(Pico_mcd->prg_ram, 0, sizeof(mcd_state) - sizeof(Pico_mcd->bios));
d1df8786	35	(unsigned int )(Pico_mcd->bios + 0x70) = 0xffffffff; // reset hint vector (simplest way to implement reg6)
b837b69b	36	PicoMCD \|= 2; // s68k reset pending. TODO: move
672ad671	37	Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode with m68k access after reset
cc68a136	38	counter75hz = 0;
	39
	40	LC89510_Reset();
	41	Reset_CD();
	42
	43	return 0;
	44	}
	45
	46	static __inline void SekRun(int cyc)
	47	{
	48	int cyc_do;
	49	SekCycleAim+=cyc;
	50	if((cyc_do=SekCycleAim-SekCycleCnt) < 0) return;
b837b69b	51	#if defined(EMU_C68K)
	52	PicoCpu.cycles=cyc_do;
	53	CycloneRun(&PicoCpu);
	54	SekCycleCnt+=cyc_do-PicoCpu.cycles;
	55	#elif defined(EMU_M68K)
cc68a136	56	m68k_set_context(&PicoM68kCPU);
	57	SekCycleCnt+=m68k_execute(cyc_do);
	58	#endif
	59	}
	60
	61	static __inline void SekRunS68k(int cyc)
	62	{
	63	int cyc_do;
	64	SekCycleAimS68k+=cyc;
	65	if((cyc_do=SekCycleAimS68k-SekCycleCntS68k) < 0) return;
b837b69b	66	#if defined(EMU_C68K)
	67	PicoCpuS68k.cycles=cyc_do;
	68	CycloneRun(&PicoCpuS68k);
	69	SekCycleCntS68k+=cyc_do-PicoCpuS68k.cycles;
	70	#elif defined(EMU_M68K)
cc68a136	71	m68k_set_context(&PicoS68kCPU);
	72	SekCycleCntS68k+=m68k_execute(cyc_do);
	73	#endif
	74	}
	75
bf098bc5	76	static __inline void check_cd_dma(void)
	77	{
	78	int ddx;
	79
c459aefd	80	if (!(Pico_mcd->scd.Status_CDC & 0x08)) return;
bf098bc5	81
	82	ddx = Pico_mcd->s68k_regs[4] & 7;
	83	if (ddx < 2) return; // invalid
c459aefd	84	if (ddx < 4) {
	85	Pico_mcd->s68k_regs[4] \|= 0x40; // Data set ready in host port
	86	return;
	87	}
bf098bc5	88	if (ddx == 6) return; // invalid
	89
	90	Update_CDC_TRansfer(ddx); // now go and do the actual transfer
	91	}
	92
b837b69b	93	// to be called on 224 or line_sample scanlines only
	94	static __inline void getSamples(int y)
	95	{
	96	if(y == 224) {
	97	//dprintf("sta%i: %i [%i]", (emustatus & 2), emustatus, y);
	98	if(emustatus & 2)
	99	sound_render(PsndLen/2, PsndLen-PsndLen/2);
	100	else sound_render(0, PsndLen);
	101	if (emustatus&1) emustatus\|=2; else emustatus&=~2;
	102	if (PicoWriteSound) PicoWriteSound();
	103	// clear sound buffer
	104	memset(PsndOut, 0, (PicoOpt & 8) ? (PsndLen<<2) : (PsndLen<<1));
	105	}
	106	else if(emustatus & 3) {
	107	emustatus\|= 2;
	108	emustatus&=~1;
	109	sound_render(0, PsndLen/2);
	110	}
	111	}
	112
	113
cc68a136	114
	115	// Accurate but slower frame which does hints
	116	static int PicoFrameHintsMCD(void)
	117	{
	118	struct PicoVideo *pv=&Pico.video;
672ad671	119	int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample,counter75hz_lim;
cc68a136	120	const int cycles_68k=488,cycles_z80=228,cycles_s68k=795; // both PAL and NTSC compile to same values
	121	int skip=PicoSkipFrame \|\| (PicoOpt&0x10);
	122	int hint; // Hint counter
	123
	124	if(Pico.m.pal) { //
	125	//cycles_68k = (int) ((double) OSC_PAL / 7 / 50 / 312 + 0.4); // should compile to a constant (488)
	126	//cycles_z80 = (int) ((double) OSC_PAL / 15 / 50 / 312 + 0.4); // 228
	127	lines = 312; // Steve Snake says there are 313 lines, but this seems to also work well
	128	line_sample = 68;
672ad671	129	counter75hz_lim = 2080;
cc68a136	130	if(pv->reg[1]&8) lines_vis = 240;
	131	} else {
	132	//cycles_68k = (int) ((double) OSC_NTSC / 7 / 60 / 262 + 0.4); // 488
	133	//cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228
	134	lines = 262;
672ad671	135	counter75hz_lim = 2096;
cc68a136	136	line_sample = 93;
	137	}
	138
	139	SekCyclesReset();
	140	SekCyclesResetS68k();
	141	//z80ExtraCycles = 0;
	142
	143	if(PicoOpt&4)
	144	z80CycleAim = 0;
	145	// z80_resetCycles();
	146
	147	pv->status&=~0x88; // clear V-Int, come out of vblank
	148
	149	hint=pv->reg[10]; // Load H-Int counter
	150	//dprintf("-hint: %i", hint);
	151
	152	for (y=0;y<lines;y++)
	153	{
	154	Pico.m.scanline=(short)y;
	155
	156	// pad delay (for 6 button pads)
	157	if(PicoOpt&0x20) {
	158	if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0;
	159	if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0;
	160	}
	161
bf098bc5	162	check_cd_dma();
bf098bc5	163
cc68a136	164	// H-Interrupts:
	165	if(y <= lines_vis && --hint < 0) // y <= lines_vis: Comix Zone, Golden Axe
	166	{
	167	//dprintf("rhint:old @ %06x", SekPc);
	168	hint=pv->reg[10]; // Reload H-Int counter
	169	pv->pending_ints\|=0x10;
	170	if (pv->reg[0]&0x10) SekInterrupt(4);
	171	//dprintf("rhint: %i @ %06x [%i\|%i]", hint, SekPc, y, SekCycleCnt);
	172	//dprintf("hint_routine: %x", ((unsigned short)(Pico.ram+0x0B84)<<16)\|(unsigned short)(Pico.ram+0x0B86));
	173	}
	174
	175	// V-Interrupt:
	176	if (y == lines_vis)
	177	{
	178	//dprintf("vint: @ %06x [%i\|%i]", SekPc, y, SekCycleCnt);
	179	pv->status\|=0x88; // V-Int happened, go into vblank
	180	SekRun(128); SekCycleAim-=128; // there must be a gap between H and V ints, also after vblank bit set (Mazin Saga, Bram Stoker's Dracula)
	181	/*if(Pico.m.z80Run && (PicoOpt&4)) {
	182	z80CycleAim+=cycles_z80/2;
	183	total_z80+=z80_run(z80CycleAim-total_z80);
	184	z80CycleAim-=cycles_z80/2;
	185	}*/
	186	pv->pending_ints\|=0x20;
	187	if(pv->reg[1]&0x20) SekInterrupt(6);
	188	if(Pico.m.z80Run && (PicoOpt&4)) // ?
	189	z80_int();
	190	//dprintf("zint: [%i\|%i] zPC=%04x", Pico.m.scanline, SekCyclesDone(), mz80GetRegisterValue(NULL, 0));
	191	}
	192
	193	// decide if we draw this line
	194	#if CAN_HANDLE_240_LINES
	195	if(!skip && ((!(pv->reg[1]&8) && y<224) \|\| ((pv->reg[1]&8) && y<240)) )
	196	#else
	197	if(!skip && y<224)
	198	#endif
	199	PicoLine(y);
	200
	201	if(PicoOpt&1)
	202	sound_timers_and_dac(y);
	203
	204	// get samples from sound chips
	205	if(y == 32 && PsndOut)
	206	emustatus &= ~1;
	207	else if((y == 224 \|\| y == line_sample) && PsndOut)
b837b69b	208	getSamples(y);
cc68a136	209
	210	// Run scanline:
	211	//dprintf("m68k starting exec @ %06x", SekPc);
672ad671	212	if(Pico.m.dma_bytes) SekCycleCnt+=CheckDMA();
cc68a136	213	SekRun(cycles_68k);
c459aefd	214	if ((Pico_mcd->m.busreq&3) == 1) { // no busreq/no reset
cc68a136	215	#if 0
	216	int i;
	217	FILE *f = fopen("prg_ram.bin", "wb");
	218	for (i = 0; i < 0x80000; i+=2)
	219	{
	220	int tmp = Pico_mcd->prg_ram[i];
	221	Pico_mcd->prg_ram[i] = Pico_mcd->prg_ram[i+1];
	222	Pico_mcd->prg_ram[i+1] = tmp;
	223	}
	224	fwrite(Pico_mcd->prg_ram, 1, 0x80000, f);
	225	fclose(f);
	226	exit(1);
	227	#endif
	228	//dprintf("s68k starting exec @ %06x", SekPcS68k);
	229	SekRunS68k(cycles_s68k);
	230	}
	231
	232	if((PicoOpt&4) && Pico.m.z80Run) {
	233	Pico.m.z80Run\|=2;
	234	z80CycleAim+=cycles_z80;
	235	total_z80+=z80_run(z80CycleAim-total_z80);
	236	}
	237
672ad671	238	if ((counter75hz+=10) >= counter75hz_lim) {
672ad671	239	counter75hz -= counter75hz_lim;
cc68a136	240	Check_CD_Command();
cc68a136	241	}
d1df8786	242
	243	if (Pico_mcd->rot_comp.Reg_58 & 0x8000)
	244	gfx_cd_update();
cc68a136	245	}
	246
	247	// draw a frame just after vblank in alternative render mode
	248	if(!PicoSkipFrame && (PicoOpt&0x10))
	249	PicoFrameFull();
	250
	251	return 0;
	252	}
	253
	254
	255	int PicoFrameMCD(void)
	256	{
	257	if(!(PicoOpt&0x10))
	258	PicoFrameStart();
	259
	260	PicoFrameHintsMCD();
	261
	262	return 0;
	263	}
	264
	265