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

// This is a direct rewrite of gfx_cd.asm (x86 asm to C).
// You can even find some x86 register names :)
// Original code (c) 2002 by Stéphane Dallongeville

// (c) Copyright 2007, Grazvydas "notaz" Ignotas


#include "../PicoInt.h"

#define _rot_comp Pico_mcd->rot_comp

static const int Table_Rot_Time[] =
{
	0x00054000, 0x00048000, 0x00040000, 0x00036000,          //; 008-032               ; briefing - sprite
	0x0002E000, 0x00028000, 0x00024000, 0x00022000,          //; 036-064               ; arbre souvent
	0x00021000, 0x00020000, 0x0001E000, 0x0001B800,          //; 068-096               ; map thunderstrike
	0x00019800, 0x00017A00, 0x00015C00, 0x00013E00,          //; 100-128               ; logo défoncé

	0x00012000, 0x00011800, 0x00011000, 0x00010800,          //; 132-160               ; briefing - map
	0x00010000, 0x0000F800, 0x0000F000, 0x0000E800,          //; 164-192
	0x0000E000, 0x0000D800, 0x0000D000, 0x0000C800,          //; 196-224
	0x0000C000, 0x0000B800, 0x0000B000, 0x0000A800,          //; 228-256               ; batman visage

	0x0000A000, 0x00009F00, 0x00009E00, 0x00009D00,          //; 260-288
	0x00009C00, 0x00009B00, 0x00009A00, 0x00009900,          //; 292-320
	0x00009800, 0x00009700, 0x00009600, 0x00009500,          //; 324-352
	0x00009400, 0x00009300, 0x00009200, 0x00009100,          //; 356-384

	0x00009000, 0x00008F00, 0x00008E00, 0x00008D00,          //; 388-416
	0x00008C00, 0x00008B00, 0x00008A00, 0x00008900,          //; 420-448
	0x00008800, 0x00008700, 0x00008600, 0x00008500,          //; 452-476
	0x00008400, 0x00008300, 0x00008200, 0x00008100,          //; 480-512
};


static void gfx_cd_start(void)
{
	int upd_len;

	// _rot_comp.XD_Mul = ((_rot_comp.Reg_5C & 0x1f) + 1) * 4; // unused
	_rot_comp.Function = (_rot_comp.Reg_58 & 7) | (Pico_mcd->s68k_regs[3] & 0x18);	// Jmp_Adr
	// _rot_comp.Buffer_Adr = (_rot_comp.Reg_5E & 0xfff8) << 2; // unused?
	_rot_comp.YD = (_rot_comp.Reg_60 >> 3) & 7;
	_rot_comp.Vector_Adr = (_rot_comp.Reg_66 & 0xfffe) << 2;

	upd_len = (_rot_comp.Reg_62 >> 3) & 0x3f;
	upd_len = Table_Rot_Time[upd_len];
	_rot_comp.Draw_Speed = _rot_comp.Float_Part = upd_len;

	_rot_comp.Reg_58 |= 0x8000;	// Stamp_Size,  we start a new GFX operation

	switch (_rot_comp.Reg_58 & 6)	// Scr_16?
	{
		case 0:	// ?
			_rot_comp.Stamp_Map_Adr = (_rot_comp.Reg_5A & 0xff80) << 2;
			break;
		case 2: // .Dot_32
			_rot_comp.Stamp_Map_Adr = (_rot_comp.Reg_5A & 0xffe0) << 2;
			break;
		case 4: // .Scr_16
			_rot_comp.Stamp_Map_Adr = 0x20000;
			break;
		case 6: // .Scr_16_Dot_32
			_rot_comp.Stamp_Map_Adr = (_rot_comp.Reg_5A & 0xe000) << 2;
			break;
	}

	dprintf("gfx_cd_start, stamp_map_addr=%06x", _rot_comp.Stamp_Map_Adr);

	gfx_cd_update();
}


static void gfx_completed(void)
{
	_rot_comp.Reg_58 &= 0x7fff;	// Stamp_Size
	_rot_comp.Reg_64  = 0;
	if (Pico_mcd->s68k_regs[0x33] & (1<<1))
	{
		dprintf("gfx_cd irq 1");
		SekInterruptS68k(1);
	}
}


static void gfx_do(unsigned int func, unsigned short *stamp_base, unsigned int H_Dot)
{
	unsigned int eax, ebx, ecx, edx, esi, edi, pixel;
	unsigned int XD, Buffer_Adr;
	int DYXS;

	XD = _rot_comp.Reg_60 & 7;
	Buffer_Adr = ((_rot_comp.Reg_5E & 0xfff8) + _rot_comp.YD) << 2;
	ecx = *(unsigned int *)(Pico_mcd->word_ram2M + _rot_comp.Vector_Adr);
	edx = ecx >> 16;
	ecx = (ecx & 0xffff) << 8;
	edx <<= 8;
	DYXS = *(int *)(Pico_mcd->word_ram2M + _rot_comp.Vector_Adr + 4);
	_rot_comp.Vector_Adr += 8;

	// MAKE_IMAGE_LINE
	while (H_Dot)
	{
		// MAKE_IMAGE_PIXEL
		if (!(func & 1))	// NOT TILED
		{
			int mask = (func & 4) ? 0x00800000 : 0x00f80000;
			if ((ecx | edx) & mask)
			{
				if (func & 0x18) goto Next_Pixel;
				pixel = 0;
				goto Pixel_Out;
			}
		}

		if (func & 2)		// mode 32x32 dot
		{
			if (func & 4)	// 16x16 screen
			{
				ebx = ((ecx >> (11+5)) & 0x007f) |
				      ((edx >> (11-2)) & 0x3f80);
			}
			else		// 1x1 screen
			{
				ebx = ((ecx >> (11+5)) & 0x07) |
				      ((edx >> (11+2)) & 0x38);
			}
		}
		else			// mode 16x16 dot
		{
			if (func & 4)	// 16x16 screen
			{
				ebx = ((ecx >> (11+4)) & 0x00ff) |
				      ((edx >> (11-4)) & 0xff00);
			}
			else		// 1x1 screen
			{
				ebx = ((ecx >> (11+4)) & 0x0f) |
				      ((edx >> (11+0)) & 0xf0);
			}
		}

		edi = stamp_base[ebx];
		esi = (edi & 0x7ff) << 7;
		if (!esi) { pixel = 0; goto Pixel_Out; }
		edi >>= (11+1);
		edi &= (0x1c>>1);
		eax = ecx;
		ebx = edx;
		if (func & 2) edi |= 1;	// 32 dots?
		switch (edi)
		{
			case 0x00:	// No_Flip_0, 16x16 dots
				ebx = (ebx >> 9) & 0x3c;
				ebx += esi;
				edi = (eax & 0x3800) ^ 0x1000;		// bswap
				eax = ((eax >> 8) & 0x40) + ebx;
				break;
			case 0x01:	// No_Flip_0, 32x32 dots
				ebx = (ebx >> 9) & 0x7c;
				ebx += esi;
				edi = (eax & 0x3800) ^ 0x1000;		// bswap
				eax = ((eax >> 7) & 0x180) + ebx;
				break;
			case 0x02:	// No_Flip_90, 16x16 dots
				eax = (eax >> 9) & 0x3c;
				eax += esi;
				edi = (ebx & 0x3800) ^ 0x2800;		// bswap
				eax += ((ebx >> 8) & 0x40) ^ 0x40;
				break;
			case 0x03:	// No_Flip_90, 32x32 dots
				eax = (eax >> 9) & 0x7c;
				eax += esi;
				edi = (ebx & 0x3800) ^ 0x2800;		// bswap
				eax += ((ebx >> 7) & 0x180) ^ 0x180;
				break;
			case 0x04:	// No_Flip_180, 16x16 dots
				ebx = ((ebx >> 9) & 0x3c) ^ 0x3c;
				ebx += esi;
				edi = (eax & 0x3800) ^ 0x2800;		// bswap and flip
				eax = (((eax >> 8) & 0x40) ^ 0x40) + ebx;
				break;
			case 0x05:	// No_Flip_180, 32x32 dots
				ebx = ((ebx >> 9) & 0x7c) ^ 0x7c;
				ebx += esi;
				edi = (eax & 0x3800) ^ 0x2800;		// bswap and flip
				eax = (((eax >> 7) & 0x180) ^ 0x180) + ebx;
				break;
			case 0x06:	// No_Flip_270, 16x16 dots
				eax = ((eax >> 9) & 0x3c) ^ 0x3c;
				eax += esi;
				edi = (ebx & 0x3800) ^ 0x1000;		// bswap
				eax += (ebx >> 8) & 0x40;
				break;
			case 0x07:	// No_Flip_270, 32x32 dots
				eax = ((eax >> 9) & 0x7c) ^ 0x7c;
				eax += esi;
				edi = (ebx & 0x3800) ^ 0x1000;		// bswap
				eax += (ebx >> 7) & 0x180;
				break;
			case 0x08:	// Flip_0, 16x16 dots
				ebx = (ebx >> 9) & 0x3c;
				ebx += esi;
				edi = (eax & 0x3800) ^ 0x2800;		// bswap, flip
				eax = (((eax >> 8) & 0x40) ^ 0x40) + ebx;
				break;
			case 0x09:	// Flip_0, 32x32 dots
				ebx = (ebx >> 9) & 0x7c;
				ebx += esi;
				edi = (eax & 0x3800) ^ 0x2800;		// bswap, flip
				eax = (((eax >> 7) & 0x180) ^ 0x180) + ebx;
				break;
			case 0x0a:	// Flip_90, 16x16 dots
				eax = ((eax >> 9) & 0x3c) ^ 0x3c;
				eax += esi;
				edi = (ebx & 0x3800) ^ 0x2800;		// bswap, flip
				eax += ((ebx >> 8) & 0x40) ^ 0x40;
				break;
			case 0x0b:	// Flip_90, 32x32 dots
				eax = ((eax >> 9) & 0x7c) ^ 0x7c;
				eax += esi;
				edi = (ebx & 0x3800) ^ 0x2800;		// bswap, flip
				eax += ((ebx >> 7) & 0x180) ^ 0x180;
				break;
			case 0x0c:	// Flip_180, 16x16 dots
				ebx = ((ebx >> 9) & 0x3c) ^ 0x3c;
				ebx += esi;
				edi = (eax & 0x3800) ^ 0x1000;		// bswap
				eax = ((eax >> 8) & 0x40) + ebx;
				break;
			case 0x0d:	// Flip_180, 32x32 dots
				ebx = ((ebx >> 9) & 0x7c) ^ 0x7c;
				ebx += esi;
				edi = (eax & 0x3800) ^ 0x1000;		// bswap
				eax = ((eax >> 7) & 0x180) + ebx;
				break;
			case 0x0e:	// Flip_270, 16x16 dots
				eax = (eax >> 9) & 0x3c;
				eax += esi;
				edi = (ebx & 0x3800) ^ 0x1000;		// bswap, flip
				eax += (ebx >> 8) & 0x40;
				break;
			case 0x0f:	// Flip_270, 32x32 dots
				eax = (eax >> 9) & 0x7c;
				eax += esi;
				edi = (ebx & 0x3800) ^ 0x1000;		// bswap, flip
				eax += (ebx >> 7) & 0x180;
				break;
		}

		pixel = *(Pico_mcd->word_ram2M + (edi >> 12) + eax);
		if (!(edi & 0x800)) pixel >>= 4;
		else pixel &= 0x0f;

Pixel_Out:
		if (!pixel && (func & 0x18)) goto Next_Pixel;
		esi = Buffer_Adr + ((XD>>1)^1);				// pixel addr
		eax = *(Pico_mcd->word_ram2M + esi);			// old pixel
		if (XD & 1)
		{
			if ((eax & 0x0f) && (func & 0x18) == 0x08) goto Next_Pixel; // underwrite
			*(Pico_mcd->word_ram2M + esi) = pixel | (eax & 0xf0);
		}
		else
		{
			if ((eax & 0xf0) && (func & 0x18) == 0x08) goto Next_Pixel; // underwrite
			*(Pico_mcd->word_ram2M + esi) = (pixel << 4) | (eax & 0xf);
		}


Next_Pixel:
		ecx += (DYXS << 16) >> 16;	// _rot_comp.DXS;
		edx +=  DYXS >> 16;		// _rot_comp.DYS;
		XD++;
		if (XD >= 8)
		{
			Buffer_Adr += ((_rot_comp.Reg_5C & 0x1f) + 1) << 5;
			XD = 0;
		}
		H_Dot--;
	}
	// end while


// nothing_to_draw:
	_rot_comp.YD++;
	// _rot_comp.V_Dot--; // will be done by caller
}


PICO_INTERNAL void gfx_cd_update(void)
{
	int V_Dot = _rot_comp.Reg_64 & 0xff;
	int jobs;

	dprintf("gfx_cd_update, Reg_64 = %04x", _rot_comp.Reg_64);

	if (!V_Dot)
	{
		gfx_completed();
		return;
	}

	jobs = _rot_comp.Float_Part >> 16;

	if (!jobs)
	{
		_rot_comp.Float_Part += _rot_comp.Draw_Speed;
		return;
	}

	_rot_comp.Float_Part &= 0xffff;
	_rot_comp.Float_Part += _rot_comp.Draw_Speed;

	if (PicoOpt & 0x1000)			// scale/rot enabled
	{
		unsigned int func = _rot_comp.Function;
		unsigned int H_Dot = _rot_comp.Reg_62 & 0x1ff;
		unsigned short *stamp_base = (unsigned short *) (Pico_mcd->word_ram2M + _rot_comp.Stamp_Map_Adr);

		while (jobs--)
		{
			gfx_do(func, stamp_base, H_Dot);	// jmp [Jmp_Adr]:

			V_Dot--;				// dec byte [V_Dot]
			if (V_Dot == 0)
			{
				// GFX_Completed:
				gfx_completed();
				return;
			}
		}
	}
	else
	{
		if (jobs >= V_Dot)
		{
			gfx_completed();
			return;
		}
		V_Dot -= jobs;
	}

	_rot_comp.Reg_64 = V_Dot;
}


PICO_INTERNAL_ASM unsigned int gfx_cd_read(unsigned int a)
{
	unsigned int d = 0;

	switch (a) {
		case 0x58: d = _rot_comp.Reg_58; break;
		case 0x5A: d = _rot_comp.Reg_5A; break;
		case 0x5C: d = _rot_comp.Reg_5C; break;
		case 0x5E: d = _rot_comp.Reg_5E; break;
		case 0x60: d = _rot_comp.Reg_60; break;
		case 0x62: d = _rot_comp.Reg_62; break;
		case 0x64: d = _rot_comp.Reg_64; break;
		case 0x66: break;
		default: dprintf("gfx_cd_read FIXME: unexpected address: %02x", a); break;
	}

	dprintf("gfx_cd_read(%02x) = %04x", a, d);

	return d;
}

PICO_INTERNAL_ASM void gfx_cd_write16(unsigned int a, unsigned int d)
{
	dprintf("gfx_cd_write16(%x, %04x)", a, d);

	switch (a) {
		case 0x58: // .Reg_Stamp_Size
			_rot_comp.Reg_58 = d & 7;
			return;

		case 0x5A: // .Reg_Stamp_Adr
			_rot_comp.Reg_5A = d & 0xffe0;
			return;

		case 0x5C: // .Reg_IM_VCell_Size
			_rot_comp.Reg_5C = d & 0x1f;
			return;

		case 0x5E: // .Reg_IM_Adr
			_rot_comp.Reg_5E = d & 0xFFF8;
			return;

		case 0x60: // .Reg_IM_Offset
			_rot_comp.Reg_60 = d & 0x3f;
			return;

		case 0x62: // .Reg_IM_HDot_Size
			_rot_comp.Reg_62 = d & 0x1ff;
			return;

		case 0x64: // .Reg_IM_VDot_Size
			_rot_comp.Reg_64 = d & 0xff;	// V_Dot, must be 32bit?
			return;

		case 0x66: // .Reg_Vector_Adr
			_rot_comp.Reg_66 = d & 0xfffe;
			if (Pico_mcd->s68k_regs[3]&4) return; // can't do tanformations in 1M mode
			gfx_cd_start();
			return;

		default: dprintf("gfx_cd_write16 FIXME: unexpected address: %02x", a); return;
	}
}


PICO_INTERNAL void gfx_cd_reset(void)
{
	memset(&_rot_comp.Reg_58, 0, sizeof(_rot_comp));
}


// --------------------------------

#include "cell_map.c"

#ifndef UTYPES_DEFINED
typedef unsigned short u16;
#endif

// check: Heart of the alien, jaguar xj 220
PICO_INTERNAL void DmaSlowCell(unsigned int source, unsigned int a, int len, unsigned char inc)
{
  unsigned char *base;
  unsigned int asrc, a2;
  u16 *r;

  base = Pico_mcd->word_ram1M[Pico_mcd->s68k_regs[3]&1];

  switch (Pico.video.type)
  {
    case 1: // vram
      r = Pico.vram;
      for(; len; len--)
      {
        asrc = cell_map(source >> 2) << 2;
        asrc |= source & 2;
        // if(a&1) d=(d<<8)|(d>>8); // ??
        r[a>>1] = *(u16 *)(base + asrc);
	source += 2;
        // AutoIncrement
        a=(u16)(a+inc);
      }
      rendstatus|=0x10;
      break;

    case 3: // cram
      Pico.m.dirtyPal = 1;
      r = Pico.cram;
      for(a2=a&0x7f; len; len--)
      {
        asrc = cell_map(source >> 2) << 2;
        asrc |= source & 2;
        r[a2>>1] = *(u16 *)(base + asrc);
	source += 2;
        // AutoIncrement
        a2+=inc;
        // good dest?
        if(a2 >= 0x80) break;
      }
      a=(a&0xff00)|a2;
      break;

    case 5: // vsram[a&0x003f]=d;
      r = Pico.vsram;
      for(a2=a&0x7f; len; len--)
      {
        asrc = cell_map(source >> 2) << 2;
        asrc |= source & 2;
        r[a2>>1] = *(u16 *)(base + asrc);
	source += 2;
        // AutoIncrement
        a2+=inc;
        // good dest?
        if(a2 >= 0x80) break;
      }
      a=(a&0xff00)|a2;
      break;
  }
  // remember addr
  Pico.video.addr=(u16)a;
}
Commit	Line	Data
	1	// This is a direct rewrite of gfx_cd.asm (x86 asm to C).
	2	// You can even find some x86 register names :)
	3	// Original code (c) 2002 by Stéphane Dallongeville
	4
	5	// (c) Copyright 2007, Grazvydas "notaz" Ignotas
	6
	7
	8	#include "../PicoInt.h"
	9
	10	#define _rot_comp Pico_mcd->rot_comp
	11
	12	static const int Table_Rot_Time[] =
	13	{
	14	0x00054000, 0x00048000, 0x00040000, 0x00036000, //; 008-032 ; briefing - sprite
	15	0x0002E000, 0x00028000, 0x00024000, 0x00022000, //; 036-064 ; arbre souvent
	16	0x00021000, 0x00020000, 0x0001E000, 0x0001B800, //; 068-096 ; map thunderstrike
	17	0x00019800, 0x00017A00, 0x00015C00, 0x00013E00, //; 100-128 ; logo défoncé
	18
	19	0x00012000, 0x00011800, 0x00011000, 0x00010800, //; 132-160 ; briefing - map
	20	0x00010000, 0x0000F800, 0x0000F000, 0x0000E800, //; 164-192
	21	0x0000E000, 0x0000D800, 0x0000D000, 0x0000C800, //; 196-224
	22	0x0000C000, 0x0000B800, 0x0000B000, 0x0000A800, //; 228-256 ; batman visage
	23
	24	0x0000A000, 0x00009F00, 0x00009E00, 0x00009D00, //; 260-288
	25	0x00009C00, 0x00009B00, 0x00009A00, 0x00009900, //; 292-320
	26	0x00009800, 0x00009700, 0x00009600, 0x00009500, //; 324-352
	27	0x00009400, 0x00009300, 0x00009200, 0x00009100, //; 356-384
	28
	29	0x00009000, 0x00008F00, 0x00008E00, 0x00008D00, //; 388-416
	30	0x00008C00, 0x00008B00, 0x00008A00, 0x00008900, //; 420-448
	31	0x00008800, 0x00008700, 0x00008600, 0x00008500, //; 452-476
	32	0x00008400, 0x00008300, 0x00008200, 0x00008100, //; 480-512
	33	};
	34
	35
	36	static void gfx_cd_start(void)
	37	{
	38	int upd_len;
	39
	40	// _rot_comp.XD_Mul = ((_rot_comp.Reg_5C & 0x1f) + 1) * 4; // unused
	41	_rot_comp.Function = (_rot_comp.Reg_58 & 7) \| (Pico_mcd->s68k_regs[3] & 0x18); // Jmp_Adr
	42	// _rot_comp.Buffer_Adr = (_rot_comp.Reg_5E & 0xfff8) << 2; // unused?
	43	_rot_comp.YD = (_rot_comp.Reg_60 >> 3) & 7;
	44	_rot_comp.Vector_Adr = (_rot_comp.Reg_66 & 0xfffe) << 2;
	45
	46	upd_len = (_rot_comp.Reg_62 >> 3) & 0x3f;
	47	upd_len = Table_Rot_Time[upd_len];
	48	_rot_comp.Draw_Speed = _rot_comp.Float_Part = upd_len;
	49
	50	_rot_comp.Reg_58 \|= 0x8000; // Stamp_Size, we start a new GFX operation
	51
	52	switch (_rot_comp.Reg_58 & 6) // Scr_16?
	53	{
	54	case 0: // ?
	55	_rot_comp.Stamp_Map_Adr = (_rot_comp.Reg_5A & 0xff80) << 2;
	56	break;
	57	case 2: // .Dot_32
	58	_rot_comp.Stamp_Map_Adr = (_rot_comp.Reg_5A & 0xffe0) << 2;
	59	break;
	60	case 4: // .Scr_16
	61	_rot_comp.Stamp_Map_Adr = 0x20000;
	62	break;
	63	case 6: // .Scr_16_Dot_32
	64	_rot_comp.Stamp_Map_Adr = (_rot_comp.Reg_5A & 0xe000) << 2;
	65	break;
	66	}
	67
	68	dprintf("gfx_cd_start, stamp_map_addr=%06x", _rot_comp.Stamp_Map_Adr);
	69
	70	gfx_cd_update();
	71	}
	72
	73
	74	static void gfx_completed(void)
	75	{
	76	_rot_comp.Reg_58 &= 0x7fff; // Stamp_Size
	77	_rot_comp.Reg_64 = 0;
	78	if (Pico_mcd->s68k_regs[0x33] & (1<<1))
	79	{
	80	dprintf("gfx_cd irq 1");
	81	SekInterruptS68k(1);
	82	}
	83	}
	84
	85
	86	static void gfx_do(unsigned int func, unsigned short *stamp_base, unsigned int H_Dot)
	87	{
	88	unsigned int eax, ebx, ecx, edx, esi, edi, pixel;
	89	unsigned int XD, Buffer_Adr;
	90	int DYXS;
	91
	92	XD = _rot_comp.Reg_60 & 7;
	93	Buffer_Adr = ((_rot_comp.Reg_5E & 0xfff8) + _rot_comp.YD) << 2;
	94	ecx = (unsigned int )(Pico_mcd->word_ram2M + _rot_comp.Vector_Adr);
	95	edx = ecx >> 16;
	96	ecx = (ecx & 0xffff) << 8;
	97	edx <<= 8;
	98	DYXS = (int )(Pico_mcd->word_ram2M + _rot_comp.Vector_Adr + 4);
	99	_rot_comp.Vector_Adr += 8;
	100
	101	// MAKE_IMAGE_LINE
	102	while (H_Dot)
	103	{
	104	// MAKE_IMAGE_PIXEL
	105	if (!(func & 1)) // NOT TILED
	106	{
	107	int mask = (func & 4) ? 0x00800000 : 0x00f80000;
	108	if ((ecx \| edx) & mask)
	109	{
	110	if (func & 0x18) goto Next_Pixel;
	111	pixel = 0;
	112	goto Pixel_Out;
	113	}
	114	}
	115
	116	if (func & 2) // mode 32x32 dot
	117	{
	118	if (func & 4) // 16x16 screen
	119	{
	120	ebx = ((ecx >> (11+5)) & 0x007f) \|
	121	((edx >> (11-2)) & 0x3f80);
	122	}
	123	else // 1x1 screen
	124	{
	125	ebx = ((ecx >> (11+5)) & 0x07) \|
	126	((edx >> (11+2)) & 0x38);
	127	}
	128	}
	129	else // mode 16x16 dot
	130	{
	131	if (func & 4) // 16x16 screen
	132	{
	133	ebx = ((ecx >> (11+4)) & 0x00ff) \|
	134	((edx >> (11-4)) & 0xff00);
	135	}
	136	else // 1x1 screen
	137	{
	138	ebx = ((ecx >> (11+4)) & 0x0f) \|
	139	((edx >> (11+0)) & 0xf0);
	140	}
	141	}
	142
	143	edi = stamp_base[ebx];
	144	esi = (edi & 0x7ff) << 7;
	145	if (!esi) { pixel = 0; goto Pixel_Out; }
	146	edi >>= (11+1);
	147	edi &= (0x1c>>1);
	148	eax = ecx;
	149	ebx = edx;
	150	if (func & 2) edi \|= 1; // 32 dots?
	151	switch (edi)
	152	{
	153	case 0x00: // No_Flip_0, 16x16 dots
	154	ebx = (ebx >> 9) & 0x3c;
	155	ebx += esi;
	156	edi = (eax & 0x3800) ^ 0x1000; // bswap
	157	eax = ((eax >> 8) & 0x40) + ebx;
	158	break;
	159	case 0x01: // No_Flip_0, 32x32 dots
	160	ebx = (ebx >> 9) & 0x7c;
	161	ebx += esi;
	162	edi = (eax & 0x3800) ^ 0x1000; // bswap
	163	eax = ((eax >> 7) & 0x180) + ebx;
	164	break;
	165	case 0x02: // No_Flip_90, 16x16 dots
	166	eax = (eax >> 9) & 0x3c;
	167	eax += esi;
	168	edi = (ebx & 0x3800) ^ 0x2800; // bswap
	169	eax += ((ebx >> 8) & 0x40) ^ 0x40;
	170	break;
	171	case 0x03: // No_Flip_90, 32x32 dots
	172	eax = (eax >> 9) & 0x7c;
	173	eax += esi;
	174	edi = (ebx & 0x3800) ^ 0x2800; // bswap
	175	eax += ((ebx >> 7) & 0x180) ^ 0x180;
	176	break;
	177	case 0x04: // No_Flip_180, 16x16 dots
	178	ebx = ((ebx >> 9) & 0x3c) ^ 0x3c;
	179	ebx += esi;
	180	edi = (eax & 0x3800) ^ 0x2800; // bswap and flip
	181	eax = (((eax >> 8) & 0x40) ^ 0x40) + ebx;
	182	break;
	183	case 0x05: // No_Flip_180, 32x32 dots
	184	ebx = ((ebx >> 9) & 0x7c) ^ 0x7c;
	185	ebx += esi;
	186	edi = (eax & 0x3800) ^ 0x2800; // bswap and flip
	187	eax = (((eax >> 7) & 0x180) ^ 0x180) + ebx;
	188	break;
	189	case 0x06: // No_Flip_270, 16x16 dots
	190	eax = ((eax >> 9) & 0x3c) ^ 0x3c;
	191	eax += esi;
	192	edi = (ebx & 0x3800) ^ 0x1000; // bswap
	193	eax += (ebx >> 8) & 0x40;
	194	break;
	195	case 0x07: // No_Flip_270, 32x32 dots
	196	eax = ((eax >> 9) & 0x7c) ^ 0x7c;
	197	eax += esi;
	198	edi = (ebx & 0x3800) ^ 0x1000; // bswap
	199	eax += (ebx >> 7) & 0x180;
	200	break;
	201	case 0x08: // Flip_0, 16x16 dots
	202	ebx = (ebx >> 9) & 0x3c;
	203	ebx += esi;
	204	edi = (eax & 0x3800) ^ 0x2800; // bswap, flip
	205	eax = (((eax >> 8) & 0x40) ^ 0x40) + ebx;
	206	break;
	207	case 0x09: // Flip_0, 32x32 dots
	208	ebx = (ebx >> 9) & 0x7c;
	209	ebx += esi;
	210	edi = (eax & 0x3800) ^ 0x2800; // bswap, flip
	211	eax = (((eax >> 7) & 0x180) ^ 0x180) + ebx;
	212	break;
	213	case 0x0a: // Flip_90, 16x16 dots
	214	eax = ((eax >> 9) & 0x3c) ^ 0x3c;
	215	eax += esi;
	216	edi = (ebx & 0x3800) ^ 0x2800; // bswap, flip
	217	eax += ((ebx >> 8) & 0x40) ^ 0x40;
	218	break;
	219	case 0x0b: // Flip_90, 32x32 dots
	220	eax = ((eax >> 9) & 0x7c) ^ 0x7c;
	221	eax += esi;
	222	edi = (ebx & 0x3800) ^ 0x2800; // bswap, flip
	223	eax += ((ebx >> 7) & 0x180) ^ 0x180;
	224	break;
	225	case 0x0c: // Flip_180, 16x16 dots
	226	ebx = ((ebx >> 9) & 0x3c) ^ 0x3c;
	227	ebx += esi;
	228	edi = (eax & 0x3800) ^ 0x1000; // bswap
	229	eax = ((eax >> 8) & 0x40) + ebx;
	230	break;
	231	case 0x0d: // Flip_180, 32x32 dots
	232	ebx = ((ebx >> 9) & 0x7c) ^ 0x7c;
	233	ebx += esi;
	234	edi = (eax & 0x3800) ^ 0x1000; // bswap
	235	eax = ((eax >> 7) & 0x180) + ebx;
	236	break;
	237	case 0x0e: // Flip_270, 16x16 dots
	238	eax = (eax >> 9) & 0x3c;
	239	eax += esi;
	240	edi = (ebx & 0x3800) ^ 0x1000; // bswap, flip
	241	eax += (ebx >> 8) & 0x40;
	242	break;
	243	case 0x0f: // Flip_270, 32x32 dots
	244	eax = (eax >> 9) & 0x7c;
	245	eax += esi;
	246	edi = (ebx & 0x3800) ^ 0x1000; // bswap, flip
	247	eax += (ebx >> 7) & 0x180;
	248	break;
	249	}
	250
	251	pixel = *(Pico_mcd->word_ram2M + (edi >> 12) + eax);
	252	if (!(edi & 0x800)) pixel >>= 4;
	253	else pixel &= 0x0f;
	254
	255	Pixel_Out:
	256	if (!pixel && (func & 0x18)) goto Next_Pixel;
	257	esi = Buffer_Adr + ((XD>>1)^1); // pixel addr
	258	eax = *(Pico_mcd->word_ram2M + esi); // old pixel
	259	if (XD & 1)
	260	{
	261	if ((eax & 0x0f) && (func & 0x18) == 0x08) goto Next_Pixel; // underwrite
	262	*(Pico_mcd->word_ram2M + esi) = pixel \| (eax & 0xf0);
	263	}
	264	else
	265	{
	266	if ((eax & 0xf0) && (func & 0x18) == 0x08) goto Next_Pixel; // underwrite
	267	*(Pico_mcd->word_ram2M + esi) = (pixel << 4) \| (eax & 0xf);
	268	}
	269
	270
	271	Next_Pixel:
	272	ecx += (DYXS << 16) >> 16; // _rot_comp.DXS;
	273	edx += DYXS >> 16; // _rot_comp.DYS;
	274	XD++;
	275	if (XD >= 8)
	276	{
	277	Buffer_Adr += ((_rot_comp.Reg_5C & 0x1f) + 1) << 5;
	278	XD = 0;
	279	}
	280	H_Dot--;
	281	}
	282	// end while
	283
	284
	285	// nothing_to_draw:
	286	_rot_comp.YD++;
	287	// _rot_comp.V_Dot--; // will be done by caller
	288	}
	289
	290
	291	PICO_INTERNAL void gfx_cd_update(void)
	292	{
	293	int V_Dot = _rot_comp.Reg_64 & 0xff;
	294	int jobs;
	295
	296	dprintf("gfx_cd_update, Reg_64 = %04x", _rot_comp.Reg_64);
	297
	298	if (!V_Dot)
	299	{
	300	gfx_completed();
	301	return;
	302	}
	303
	304	jobs = _rot_comp.Float_Part >> 16;
	305
	306	if (!jobs)
	307	{
	308	_rot_comp.Float_Part += _rot_comp.Draw_Speed;
	309	return;
	310	}
	311
	312	_rot_comp.Float_Part &= 0xffff;
	313	_rot_comp.Float_Part += _rot_comp.Draw_Speed;
	314
	315	if (PicoOpt & 0x1000) // scale/rot enabled
	316	{
	317	unsigned int func = _rot_comp.Function;
	318	unsigned int H_Dot = _rot_comp.Reg_62 & 0x1ff;
	319	unsigned short stamp_base = (unsigned short ) (Pico_mcd->word_ram2M + _rot_comp.Stamp_Map_Adr);
	320
	321	while (jobs--)
	322	{
	323	gfx_do(func, stamp_base, H_Dot); // jmp [Jmp_Adr]:
	324
	325	V_Dot--; // dec byte [V_Dot]
	326	if (V_Dot == 0)
	327	{
	328	// GFX_Completed:
	329	gfx_completed();
	330	return;
	331	}
	332	}
	333	}
	334	else
	335	{
	336	if (jobs >= V_Dot)
	337	{
	338	gfx_completed();
	339	return;
	340	}
	341	V_Dot -= jobs;
	342	}
	343
	344	_rot_comp.Reg_64 = V_Dot;
	345	}
	346
	347
	348	PICO_INTERNAL_ASM unsigned int gfx_cd_read(unsigned int a)
	349	{
	350	unsigned int d = 0;
	351
	352	switch (a) {
	353	case 0x58: d = _rot_comp.Reg_58; break;
	354	case 0x5A: d = _rot_comp.Reg_5A; break;
	355	case 0x5C: d = _rot_comp.Reg_5C; break;
	356	case 0x5E: d = _rot_comp.Reg_5E; break;
	357	case 0x60: d = _rot_comp.Reg_60; break;
	358	case 0x62: d = _rot_comp.Reg_62; break;
	359	case 0x64: d = _rot_comp.Reg_64; break;
	360	case 0x66: break;
	361	default: dprintf("gfx_cd_read FIXME: unexpected address: %02x", a); break;
	362	}
	363
	364	dprintf("gfx_cd_read(%02x) = %04x", a, d);
	365
	366	return d;
	367	}
	368
	369	PICO_INTERNAL_ASM void gfx_cd_write16(unsigned int a, unsigned int d)
	370	{
	371	dprintf("gfx_cd_write16(%x, %04x)", a, d);
	372
	373	switch (a) {
	374	case 0x58: // .Reg_Stamp_Size
	375	_rot_comp.Reg_58 = d & 7;
	376	return;
	377
	378	case 0x5A: // .Reg_Stamp_Adr
	379	_rot_comp.Reg_5A = d & 0xffe0;
	380	return;
	381
	382	case 0x5C: // .Reg_IM_VCell_Size
	383	_rot_comp.Reg_5C = d & 0x1f;
	384	return;
	385
	386	case 0x5E: // .Reg_IM_Adr
	387	_rot_comp.Reg_5E = d & 0xFFF8;
	388	return;
	389
	390	case 0x60: // .Reg_IM_Offset
	391	_rot_comp.Reg_60 = d & 0x3f;
	392	return;
	393
	394	case 0x62: // .Reg_IM_HDot_Size
	395	_rot_comp.Reg_62 = d & 0x1ff;
	396	return;
	397
	398	case 0x64: // .Reg_IM_VDot_Size
	399	_rot_comp.Reg_64 = d & 0xff; // V_Dot, must be 32bit?
	400	return;
	401
	402	case 0x66: // .Reg_Vector_Adr
	403	_rot_comp.Reg_66 = d & 0xfffe;
	404	if (Pico_mcd->s68k_regs[3]&4) return; // can't do tanformations in 1M mode
	405	gfx_cd_start();
	406	return;
	407
	408	default: dprintf("gfx_cd_write16 FIXME: unexpected address: %02x", a); return;
	409	}
	410	}
	411
	412
	413	PICO_INTERNAL void gfx_cd_reset(void)
	414	{
	415	memset(&_rot_comp.Reg_58, 0, sizeof(_rot_comp));
	416	}
	417
	418
	419	// --------------------------------
	420
	421	#include "cell_map.c"
	422
	423	#ifndef UTYPES_DEFINED
	424	typedef unsigned short u16;
	425	#endif
	426
	427	// check: Heart of the alien, jaguar xj 220
	428	PICO_INTERNAL void DmaSlowCell(unsigned int source, unsigned int a, int len, unsigned char inc)
	429	{
	430	unsigned char *base;
	431	unsigned int asrc, a2;
	432	u16 *r;
	433
	434	base = Pico_mcd->word_ram1M[Pico_mcd->s68k_regs[3]&1];
	435
	436	switch (Pico.video.type)
	437	{
	438	case 1: // vram
	439	r = Pico.vram;
	440	for(; len; len--)
	441	{
	442	asrc = cell_map(source >> 2) << 2;
	443	asrc \|= source & 2;
	444	// if(a&1) d=(d<<8)\|(d>>8); // ??
	445	r[a>>1] = (u16 )(base + asrc);
	446	source += 2;
	447	// AutoIncrement
	448	a=(u16)(a+inc);
	449	}
	450	rendstatus\|=0x10;
	451	break;
	452
	453	case 3: // cram
	454	Pico.m.dirtyPal = 1;
	455	r = Pico.cram;
	456	for(a2=a&0x7f; len; len--)
	457	{
	458	asrc = cell_map(source >> 2) << 2;
	459	asrc \|= source & 2;
	460	r[a2>>1] = (u16 )(base + asrc);
	461	source += 2;
	462	// AutoIncrement
	463	a2+=inc;
	464	// good dest?
	465	if(a2 >= 0x80) break;
	466	}
	467	a=(a&0xff00)\|a2;
	468	break;
	469
	470	case 5: // vsram[a&0x003f]=d;
	471	r = Pico.vsram;
	472	for(a2=a&0x7f; len; len--)
	473	{
	474	asrc = cell_map(source >> 2) << 2;
	475	asrc \|= source & 2;
	476	r[a2>>1] = (u16 )(base + asrc);
	477	source += 2;
	478	// AutoIncrement
	479	a2+=inc;
	480	// good dest?
	481	if(a2 >= 0x80) break;
	482	}
	483	a=(a&0xff00)\|a2;
	484	break;
	485	}
	486	// remember addr
	487	Pico.video.addr=(u16)a;
	488	}
	489