[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"


extern unsigned char formatted_bram[8*0x10];


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

  return 0;
}


void PicoExitMCD(void)
{
  End_CD_Driver();
}

int PicoResetMCD(int hard)
{
  memset(Pico_mcd->prg_ram,  0, sizeof(Pico_mcd->prg_ram));
  memset(Pico_mcd->word_ram, 0, sizeof(Pico_mcd->word_ram));
  if (hard) {
	  memset(Pico_mcd->bram, 0, sizeof(Pico_mcd->bram));
	  memcpy(Pico_mcd->bram + sizeof(Pico_mcd->bram) - 8*0x10, formatted_bram, 8*0x10);
  }
  memset(Pico_mcd->s68k_regs, 0, sizeof(Pico_mcd->s68k_regs));

  *(unsigned int *)(Pico_mcd->bios + 0x70) = 0xffffffff; // reset hint vector (simplest way to implement reg6)
  Pico_mcd->m.state_flags |= 2; // s68k reset pending
  Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode with m68k access after reset
  Pico_mcd->m.counter75hz = 0;

  LC89510_Reset();
  Reset_CD();
  gfx_cd_reset();

  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 ((Pico_mcd->m.counter75hz+=10) >= counter75hz_lim) {
      Pico_mcd->m.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
51a902ae	14	extern unsigned char formatted_bram[8*0x10];
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	{
51a902ae	33	memset(Pico_mcd->prg_ram, 0, sizeof(Pico_mcd->prg_ram));
	34	memset(Pico_mcd->word_ram, 0, sizeof(Pico_mcd->word_ram));
	35	if (hard) {
	36	memset(Pico_mcd->bram, 0, sizeof(Pico_mcd->bram));
	37	memcpy(Pico_mcd->bram + sizeof(Pico_mcd->bram) - 80x10, formatted_bram, 80x10);
	38	}
	39	memset(Pico_mcd->s68k_regs, 0, sizeof(Pico_mcd->s68k_regs));
	40
d1df8786	41	(unsigned int )(Pico_mcd->bios + 0x70) = 0xffffffff; // reset hint vector (simplest way to implement reg6)
51a902ae	42	Pico_mcd->m.state_flags \|= 2; // s68k reset pending
672ad671	43	Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode with m68k access after reset
51a902ae	44	Pico_mcd->m.counter75hz = 0;
cc68a136	45
	46	LC89510_Reset();
	47	Reset_CD();
51a902ae	48	gfx_cd_reset();
cc68a136	49
	50	return 0;
	51	}
	52
	53	static __inline void SekRun(int cyc)
	54	{
	55	int cyc_do;
	56	SekCycleAim+=cyc;
	57	if((cyc_do=SekCycleAim-SekCycleCnt) < 0) return;
b837b69b	58	#if defined(EMU_C68K)
	59	PicoCpu.cycles=cyc_do;
	60	CycloneRun(&PicoCpu);
	61	SekCycleCnt+=cyc_do-PicoCpu.cycles;
	62	#elif defined(EMU_M68K)
cc68a136	63	m68k_set_context(&PicoM68kCPU);
	64	SekCycleCnt+=m68k_execute(cyc_do);
	65	#endif
	66	}
	67
	68	static __inline void SekRunS68k(int cyc)
	69	{
	70	int cyc_do;
	71	SekCycleAimS68k+=cyc;
	72	if((cyc_do=SekCycleAimS68k-SekCycleCntS68k) < 0) return;
b837b69b	73	#if defined(EMU_C68K)
	74	PicoCpuS68k.cycles=cyc_do;
	75	CycloneRun(&PicoCpuS68k);
	76	SekCycleCntS68k+=cyc_do-PicoCpuS68k.cycles;
	77	#elif defined(EMU_M68K)
cc68a136	78	m68k_set_context(&PicoS68kCPU);
	79	SekCycleCntS68k+=m68k_execute(cyc_do);
	80	#endif
	81	}
	82
bf098bc5	83	static __inline void check_cd_dma(void)
	84	{
	85	int ddx;
	86
c459aefd	87	if (!(Pico_mcd->scd.Status_CDC & 0x08)) return;
bf098bc5	88
	89	ddx = Pico_mcd->s68k_regs[4] & 7;
	90	if (ddx < 2) return; // invalid
c459aefd	91	if (ddx < 4) {
	92	Pico_mcd->s68k_regs[4] \|= 0x40; // Data set ready in host port
	93	return;
	94	}
bf098bc5	95	if (ddx == 6) return; // invalid
	96
	97	Update_CDC_TRansfer(ddx); // now go and do the actual transfer
	98	}
	99
b837b69b	100	// to be called on 224 or line_sample scanlines only
	101	static __inline void getSamples(int y)
	102	{
	103	if(y == 224) {
	104	//dprintf("sta%i: %i [%i]", (emustatus & 2), emustatus, y);
	105	if(emustatus & 2)
	106	sound_render(PsndLen/2, PsndLen-PsndLen/2);
	107	else sound_render(0, PsndLen);
	108	if (emustatus&1) emustatus\|=2; else emustatus&=~2;
	109	if (PicoWriteSound) PicoWriteSound();
	110	// clear sound buffer
	111	memset(PsndOut, 0, (PicoOpt & 8) ? (PsndLen<<2) : (PsndLen<<1));
	112	}
	113	else if(emustatus & 3) {
	114	emustatus\|= 2;
	115	emustatus&=~1;
	116	sound_render(0, PsndLen/2);
	117	}
	118	}
	119
	120
cc68a136	121
	122	// Accurate but slower frame which does hints
	123	static int PicoFrameHintsMCD(void)
	124	{
	125	struct PicoVideo *pv=&Pico.video;
672ad671	126	int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample,counter75hz_lim;
cc68a136	127	const int cycles_68k=488,cycles_z80=228,cycles_s68k=795; // both PAL and NTSC compile to same values
	128	int skip=PicoSkipFrame \|\| (PicoOpt&0x10);
	129	int hint; // Hint counter
	130
	131	if(Pico.m.pal) { //
	132	//cycles_68k = (int) ((double) OSC_PAL / 7 / 50 / 312 + 0.4); // should compile to a constant (488)
	133	//cycles_z80 = (int) ((double) OSC_PAL / 15 / 50 / 312 + 0.4); // 228
	134	lines = 312; // Steve Snake says there are 313 lines, but this seems to also work well
	135	line_sample = 68;
672ad671	136	counter75hz_lim = 2080;
cc68a136	137	if(pv->reg[1]&8) lines_vis = 240;
	138	} else {
	139	//cycles_68k = (int) ((double) OSC_NTSC / 7 / 60 / 262 + 0.4); // 488
	140	//cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228
	141	lines = 262;
672ad671	142	counter75hz_lim = 2096;
cc68a136	143	line_sample = 93;
	144	}
	145
	146	SekCyclesReset();
	147	SekCyclesResetS68k();
	148	//z80ExtraCycles = 0;
	149
	150	if(PicoOpt&4)
	151	z80CycleAim = 0;
	152	// z80_resetCycles();
	153
	154	pv->status&=~0x88; // clear V-Int, come out of vblank
	155
	156	hint=pv->reg[10]; // Load H-Int counter
	157	//dprintf("-hint: %i", hint);
	158
	159	for (y=0;y<lines;y++)
	160	{
	161	Pico.m.scanline=(short)y;
	162
	163	// pad delay (for 6 button pads)
	164	if(PicoOpt&0x20) {
	165	if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0;
	166	if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0;
	167	}
	168
bf098bc5	169	check_cd_dma();
bf098bc5	170
cc68a136	171	// H-Interrupts:
	172	if(y <= lines_vis && --hint < 0) // y <= lines_vis: Comix Zone, Golden Axe
	173	{
	174	//dprintf("rhint:old @ %06x", SekPc);
	175	hint=pv->reg[10]; // Reload H-Int counter
	176	pv->pending_ints\|=0x10;
	177	if (pv->reg[0]&0x10) SekInterrupt(4);
	178	//dprintf("rhint: %i @ %06x [%i\|%i]", hint, SekPc, y, SekCycleCnt);
	179	//dprintf("hint_routine: %x", ((unsigned short)(Pico.ram+0x0B84)<<16)\|(unsigned short)(Pico.ram+0x0B86));
	180	}
	181
	182	// V-Interrupt:
	183	if (y == lines_vis)
	184	{
	185	//dprintf("vint: @ %06x [%i\|%i]", SekPc, y, SekCycleCnt);
	186	pv->status\|=0x88; // V-Int happened, go into vblank
	187	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)
	188	/*if(Pico.m.z80Run && (PicoOpt&4)) {
	189	z80CycleAim+=cycles_z80/2;
	190	total_z80+=z80_run(z80CycleAim-total_z80);
	191	z80CycleAim-=cycles_z80/2;
	192	}*/
	193	pv->pending_ints\|=0x20;
	194	if(pv->reg[1]&0x20) SekInterrupt(6);
	195	if(Pico.m.z80Run && (PicoOpt&4)) // ?
	196	z80_int();
	197	//dprintf("zint: [%i\|%i] zPC=%04x", Pico.m.scanline, SekCyclesDone(), mz80GetRegisterValue(NULL, 0));
	198	}
	199
	200	// decide if we draw this line
	201	#if CAN_HANDLE_240_LINES
	202	if(!skip && ((!(pv->reg[1]&8) && y<224) \|\| ((pv->reg[1]&8) && y<240)) )
	203	#else
	204	if(!skip && y<224)
	205	#endif
	206	PicoLine(y);
	207
	208	if(PicoOpt&1)
	209	sound_timers_and_dac(y);
	210
	211	// get samples from sound chips
	212	if(y == 32 && PsndOut)
	213	emustatus &= ~1;
	214	else if((y == 224 \|\| y == line_sample) && PsndOut)
b837b69b	215	getSamples(y);
cc68a136	216
	217	// Run scanline:
	218	//dprintf("m68k starting exec @ %06x", SekPc);
672ad671	219	if(Pico.m.dma_bytes) SekCycleCnt+=CheckDMA();
cc68a136	220	SekRun(cycles_68k);
c459aefd	221	if ((Pico_mcd->m.busreq&3) == 1) { // no busreq/no reset
cc68a136	222	#if 0
	223	int i;
	224	FILE *f = fopen("prg_ram.bin", "wb");
	225	for (i = 0; i < 0x80000; i+=2)
	226	{
	227	int tmp = Pico_mcd->prg_ram[i];
	228	Pico_mcd->prg_ram[i] = Pico_mcd->prg_ram[i+1];
	229	Pico_mcd->prg_ram[i+1] = tmp;
	230	}
	231	fwrite(Pico_mcd->prg_ram, 1, 0x80000, f);
	232	fclose(f);
	233	exit(1);
	234	#endif
	235	//dprintf("s68k starting exec @ %06x", SekPcS68k);
	236	SekRunS68k(cycles_s68k);
	237	}
	238
	239	if((PicoOpt&4) && Pico.m.z80Run) {
	240	Pico.m.z80Run\|=2;
	241	z80CycleAim+=cycles_z80;
	242	total_z80+=z80_run(z80CycleAim-total_z80);
	243	}
	244
51a902ae	245	if ((Pico_mcd->m.counter75hz+=10) >= counter75hz_lim) {
51a902ae	246	Pico_mcd->m.counter75hz -= counter75hz_lim;
cc68a136	247	Check_CD_Command();
cc68a136	248	}
d1df8786	249
	250	if (Pico_mcd->rot_comp.Reg_58 & 0x8000)
	251	gfx_cd_update();
cc68a136	252	}
	253
	254	// draw a frame just after vblank in alternative render mode
	255	if(!PicoSkipFrame && (PicoOpt&0x10))
	256	PicoFrameFull();
	257
	258	return 0;
	259	}
	260
	261
	262	int PicoFrameMCD(void)
	263	{
	264	if(!(PicoOpt&0x10))
	265	PicoFrameStart();
	266
	267	PicoFrameHintsMCD();
	268
	269	return 0;
	270	}
	271
	272