pico/cd/gfx_cd.c

   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 "../pico_int.h"
   9
  10 #undef dprintf
  11 #define dprintf(...)
  12
  13 #define UPDATE_CYCLES 20000
  14
  15 #define _rot_comp Pico_mcd->rot_comp
  16
  17 static void gfx_do_line(unsigned int func, unsigned short *stamp_base,
  18         unsigned int H_Dot);
  19
  20 static void gfx_cd_start(void)
  21 {
  22         int w, h, cycles;
  23         int y_step;
  24
  25         w = _rot_comp.Reg_62;
  26         h = _rot_comp.Reg_64;
  27         if (w == 0 || h == 0) {
  28                 elprintf(EL_CD|EL_ANOMALY, "gfx_cd_start with %ux%u", w, h);
  29                 _rot_comp.Reg_64 = 0;
  30                 // irq?
  31                 return;
  32         }
  33
  34         // _rot_comp.XD_Mul = ((_rot_comp.Reg_5C & 0x1f) + 1) * 4; // unused
  35         _rot_comp.Function = (_rot_comp.Reg_58 & 7) | (Pico_mcd->s68k_regs[3] & 0x18);  // Jmp_Adr
  36         // _rot_comp.Buffer_Adr = (_rot_comp.Reg_5E & 0xfff8) << 2; // unused?
  37         _rot_comp.YD = (_rot_comp.Reg_60 >> 3) & 7;
  38         _rot_comp.Vector_Adr = (_rot_comp.Reg_66 & 0xfffe) << 2;
  39
  40         switch (_rot_comp.Reg_58 & 6)   // Scr_16?
  41         {
  42                 case 0: // ?
  43                         _rot_comp.Stamp_Map_Adr = (_rot_comp.Reg_5A & 0xff80) << 2;
  44                         break;
  45                 case 2: // .Dot_32
  46                         _rot_comp.Stamp_Map_Adr = (_rot_comp.Reg_5A & 0xffe0) << 2;
  47                         break;
  48                 case 4: // .Scr_16
  49                         _rot_comp.Stamp_Map_Adr = 0x20000;
  50                         break;
  51                 case 6: // .Scr_16_Dot_32
  52                         _rot_comp.Stamp_Map_Adr = (_rot_comp.Reg_5A & 0xe000) << 2;
  53                         break;
  54         }
  55
  56         _rot_comp.Reg_58 |= 0x8000;     // Stamp_Size,  we start a new GFX operation
  57
  58         cycles = 5 * w * h;
  59         if (cycles > UPDATE_CYCLES)
  60                 y_step = (UPDATE_CYCLES + 5 * w - 1) / (5 * w);
  61         else
  62                 y_step = h;
  63
  64         _rot_comp.y_step = y_step;
  65         pcd_event_schedule_s68k(PCD_EVENT_GFX, 5 * w * y_step);
  66 }
  67
  68 void gfx_cd_update(unsigned int cycles)
  69 {
  70         int w = _rot_comp.Reg_62;
  71         int h, next;
  72
  73         if (!(Pico_mcd->rot_comp.Reg_58 & 0x8000))
  74                 return;
  75
  76         h = _rot_comp.Reg_64;
  77         _rot_comp.Reg_64 -= _rot_comp.y_step;
  78
  79         if ((int)_rot_comp.Reg_64 <= 0) {
  80                 Pico_mcd->rot_comp.Reg_58 &= 0x7fff;
  81                 Pico_mcd->rot_comp.Reg_64  = 0;
  82                 if (Pico_mcd->s68k_regs[0x33] & PCDS_IEN1) {
  83                         elprintf(EL_INTS  |EL_CD, "s68k: gfx_cd irq 1");
  84                         SekInterruptS68k(1);
  85                 }
  86         }
  87         else {
  88                 next = _rot_comp.Reg_64;
  89                 if (next > _rot_comp.y_step)
  90                         next = _rot_comp.y_step;
  91
  92                 pcd_event_schedule(cycles, PCD_EVENT_GFX, 5 * w * next);
  93                 h = _rot_comp.y_step;
  94         }
  95
  96         if (PicoOpt & POPT_EN_MCD_GFX)
  97         {
  98                 unsigned int func = _rot_comp.Function;
  99                 unsigned short *stamp_base = (unsigned short *)
 100                         (Pico_mcd->word_ram2M + _rot_comp.Stamp_Map_Adr);
 101
 102                 while (h--)
 103                         gfx_do_line(func, stamp_base, w);
 104         }
 105 }
 106
 107 PICO_INTERNAL_ASM unsigned int gfx_cd_read(unsigned int a)
 108 {
 109         unsigned int d = 0;
 110
 111         switch (a) {
 112                 case 0x58: d = _rot_comp.Reg_58; break;
 113                 case 0x5A: d = _rot_comp.Reg_5A; break;
 114                 case 0x5C: d = _rot_comp.Reg_5C; break;
 115                 case 0x5E: d = _rot_comp.Reg_5E; break;
 116                 case 0x60: d = _rot_comp.Reg_60; break;
 117                 case 0x62: d = _rot_comp.Reg_62; break;
 118                 case 0x64: d = _rot_comp.Reg_64; break;
 119                 case 0x66: break;
 120                 default: dprintf("gfx_cd_read FIXME: unexpected address: %02x", a); break;
 121         }
 122
 123         dprintf("gfx_cd_read(%02x) = %04x", a, d);
 124
 125         return d;
 126
 127 }
 128
 129 static void gfx_do_line(unsigned int func, unsigned short *stamp_base,
 130         unsigned int H_Dot)
 131 {
 132         unsigned int eax, ebx, ecx, edx, esi, edi, pixel;
 133         unsigned int XD, Buffer_Adr;
 134         int DYXS;
 135
 136         XD = _rot_comp.Reg_60 & 7;
 137         Buffer_Adr = ((_rot_comp.Reg_5E & 0xfff8) + _rot_comp.YD) << 2;
 138         ecx = *(unsigned int *)(Pico_mcd->word_ram2M + _rot_comp.Vector_Adr);
 139         edx = ecx >> 16;
 140         ecx = (ecx & 0xffff) << 8;
 141         edx <<= 8;
 142         DYXS = *(int *)(Pico_mcd->word_ram2M + _rot_comp.Vector_Adr + 4);
 143         _rot_comp.Vector_Adr += 8;
 144
 145         // MAKE_IMAGE_LINE
 146         while (H_Dot)
 147         {
 148                 // MAKE_IMAGE_PIXEL
 149                 if (!(func & 1))        // NOT TILED
 150                 {
 151                         int mask = (func & 4) ? 0x00800000 : 0x00f80000;
 152                         if ((ecx | edx) & mask)
 153                         {
 154                                 if (func & 0x18) goto Next_Pixel;
 155                                 pixel = 0;
 156                                 goto Pixel_Out;
 157                         }
 158                 }
 159
 160                 if (func & 2)           // mode 32x32 dot
 161                 {
 162                         if (func & 4)   // 16x16 screen
 163                         {
 164                                 ebx = ((ecx >> (11+5)) & 0x007f) |
 165                                       ((edx >> (11-2)) & 0x3f80);
 166                         }
 167                         else            // 1x1 screen
 168                         {
 169                                 ebx = ((ecx >> (11+5)) & 0x07) |
 170                                       ((edx >> (11+2)) & 0x38);
 171                         }
 172                 }
 173                 else                    // mode 16x16 dot
 174                 {
 175                         if (func & 4)   // 16x16 screen
 176                         {
 177                                 ebx = ((ecx >> (11+4)) & 0x00ff) |
 178                                       ((edx >> (11-4)) & 0xff00);
 179                         }
 180                         else            // 1x1 screen
 181                         {
 182                                 ebx = ((ecx >> (11+4)) & 0x0f) |
 183                                       ((edx >> (11+0)) & 0xf0);
 184                         }
 185                 }
 186
 187                 edi = stamp_base[ebx];
 188                 esi = (edi & 0x7ff) << 7;
 189                 if (!esi) { pixel = 0; goto Pixel_Out; }
 190                 edi >>= (11+1);
 191                 edi &= (0x1c>>1);
 192                 eax = ecx;
 193                 ebx = edx;
 194                 if (func & 2) edi |= 1; // 32 dots?
 195                 switch (edi)
 196                 {
 197                         case 0x00:      // No_Flip_0, 16x16 dots
 198                                 ebx = (ebx >> 9) & 0x3c;
 199                                 ebx += esi;
 200                                 edi = (eax & 0x3800) ^ 0x1000;          // bswap
 201                                 eax = ((eax >> 8) & 0x40) + ebx;
 202                                 break;
 203                         case 0x01:      // No_Flip_0, 32x32 dots
 204                                 ebx = (ebx >> 9) & 0x7c;
 205                                 ebx += esi;
 206                                 edi = (eax & 0x3800) ^ 0x1000;          // bswap
 207                                 eax = ((eax >> 7) & 0x180) + ebx;
 208                                 break;
 209                         case 0x02:      // No_Flip_90, 16x16 dots
 210                                 eax = (eax >> 9) & 0x3c;
 211                                 eax += esi;
 212                                 edi = (ebx & 0x3800) ^ 0x2800;          // bswap
 213                                 eax += ((ebx >> 8) & 0x40) ^ 0x40;
 214                                 break;
 215                         case 0x03:      // No_Flip_90, 32x32 dots
 216                                 eax = (eax >> 9) & 0x7c;
 217                                 eax += esi;
 218                                 edi = (ebx & 0x3800) ^ 0x2800;          // bswap
 219                                 eax += ((ebx >> 7) & 0x180) ^ 0x180;
 220                                 break;
 221                         case 0x04:      // No_Flip_180, 16x16 dots
 222                                 ebx = ((ebx >> 9) & 0x3c) ^ 0x3c;
 223                                 ebx += esi;
 224                                 edi = (eax & 0x3800) ^ 0x2800;          // bswap and flip
 225                                 eax = (((eax >> 8) & 0x40) ^ 0x40) + ebx;
 226                                 break;
 227                         case 0x05:      // No_Flip_180, 32x32 dots
 228                                 ebx = ((ebx >> 9) & 0x7c) ^ 0x7c;
 229                                 ebx += esi;
 230                                 edi = (eax & 0x3800) ^ 0x2800;          // bswap and flip
 231                                 eax = (((eax >> 7) & 0x180) ^ 0x180) + ebx;
 232                                 break;
 233                         case 0x06:      // No_Flip_270, 16x16 dots
 234                                 eax = ((eax >> 9) & 0x3c) ^ 0x3c;
 235                                 eax += esi;
 236                                 edi = (ebx & 0x3800) ^ 0x1000;          // bswap
 237                                 eax += (ebx >> 8) & 0x40;
 238                                 break;
 239                         case 0x07:      // No_Flip_270, 32x32 dots
 240                                 eax = ((eax >> 9) & 0x7c) ^ 0x7c;
 241                                 eax += esi;
 242                                 edi = (ebx & 0x3800) ^ 0x1000;          // bswap
 243                                 eax += (ebx >> 7) & 0x180;
 244                                 break;
 245                         case 0x08:      // Flip_0, 16x16 dots
 246                                 ebx = (ebx >> 9) & 0x3c;
 247                                 ebx += esi;
 248                                 edi = (eax & 0x3800) ^ 0x2800;          // bswap, flip
 249                                 eax = (((eax >> 8) & 0x40) ^ 0x40) + ebx;
 250                                 break;
 251                         case 0x09:      // Flip_0, 32x32 dots
 252                                 ebx = (ebx >> 9) & 0x7c;
 253                                 ebx += esi;
 254                                 edi = (eax & 0x3800) ^ 0x2800;          // bswap, flip
 255                                 eax = (((eax >> 7) & 0x180) ^ 0x180) + ebx;
 256                                 break;
 257                         case 0x0a:      // Flip_90, 16x16 dots
 258                                 eax = ((eax >> 9) & 0x3c) ^ 0x3c;
 259                                 eax += esi;
 260                                 edi = (ebx & 0x3800) ^ 0x2800;          // bswap, flip
 261                                 eax += ((ebx >> 8) & 0x40) ^ 0x40;
 262                                 break;
 263                         case 0x0b:      // Flip_90, 32x32 dots
 264                                 eax = ((eax >> 9) & 0x7c) ^ 0x7c;
 265                                 eax += esi;
 266                                 edi = (ebx & 0x3800) ^ 0x2800;          // bswap, flip
 267                                 eax += ((ebx >> 7) & 0x180) ^ 0x180;
 268                                 break;
 269                         case 0x0c:      // Flip_180, 16x16 dots
 270                                 ebx = ((ebx >> 9) & 0x3c) ^ 0x3c;
 271                                 ebx += esi;
 272                                 edi = (eax & 0x3800) ^ 0x1000;          // bswap
 273                                 eax = ((eax >> 8) & 0x40) + ebx;
 274                                 break;
 275                         case 0x0d:      // Flip_180, 32x32 dots
 276                                 ebx = ((ebx >> 9) & 0x7c) ^ 0x7c;
 277                                 ebx += esi;
 278                                 edi = (eax & 0x3800) ^ 0x1000;          // bswap
 279                                 eax = ((eax >> 7) & 0x180) + ebx;
 280                                 break;
 281                         case 0x0e:      // Flip_270, 16x16 dots
 282                                 eax = (eax >> 9) & 0x3c;
 283                                 eax += esi;
 284                                 edi = (ebx & 0x3800) ^ 0x1000;          // bswap, flip
 285                                 eax += (ebx >> 8) & 0x40;
 286                                 break;
 287                         case 0x0f:      // Flip_270, 32x32 dots
 288                                 eax = (eax >> 9) & 0x7c;
 289                                 eax += esi;
 290                                 edi = (ebx & 0x3800) ^ 0x1000;          // bswap, flip
 291                                 eax += (ebx >> 7) & 0x180;
 292                                 break;
 293                 }
 294
 295                 pixel = *(Pico_mcd->word_ram2M + (edi >> 12) + eax);
 296                 if (!(edi & 0x800)) pixel >>= 4;
 297                 else pixel &= 0x0f;
 298
 299 Pixel_Out:
 300                 if (!pixel && (func & 0x18)) goto Next_Pixel;
 301                 esi = Buffer_Adr + ((XD>>1)^1);                         // pixel addr
 302                 eax = *(Pico_mcd->word_ram2M + esi);                    // old pixel
 303                 if (XD & 1)
 304                 {
 305                         if ((eax & 0x0f) && (func & 0x18) == 0x08) goto Next_Pixel; // underwrite
 306                         *(Pico_mcd->word_ram2M + esi) = pixel | (eax & 0xf0);
 307                 }
 308                 else
 309                 {
 310                         if ((eax & 0xf0) && (func & 0x18) == 0x08) goto Next_Pixel; // underwrite
 311                         *(Pico_mcd->word_ram2M + esi) = (pixel << 4) | (eax & 0xf);
 312                 }
 313
 314
 315 Next_Pixel:
 316                 ecx += (DYXS << 16) >> 16;      // _rot_comp.DXS;
 317                 edx +=  DYXS >> 16;             // _rot_comp.DYS;
 318                 XD++;
 319                 if (XD >= 8)
 320                 {
 321                         Buffer_Adr += ((_rot_comp.Reg_5C & 0x1f) + 1) << 5;
 322                         XD = 0;
 323                 }
 324                 H_Dot--;
 325         }
 326         // end while
 327
 328
 329 // nothing_to_draw:
 330         _rot_comp.YD++;
 331         // _rot_comp.V_Dot--; // will be done by caller
 332 }
 333
 334
 335 PICO_INTERNAL_ASM void gfx_cd_write16(unsigned int a, unsigned int d)
 336 {
 337         dprintf("gfx_cd_write16(%x, %04x)", a, d);
 338
 339         if (_rot_comp.Reg_58 & 0x8000)
 340                 elprintf(EL_CD|EL_ANOMALY, "cd: busy gfx reg write %02x %04x", a, d);
 341
 342         switch (a) {
 343                 case 0x58: // .Reg_Stamp_Size
 344                         _rot_comp.Reg_58 = d & 7;
 345                         return;
 346
 347                 case 0x5A: // .Reg_Stamp_Adr
 348                         _rot_comp.Reg_5A = d & 0xffe0;
 349                         return;
 350
 351                 case 0x5C: // .Reg_IM_VCell_Size
 352                         _rot_comp.Reg_5C = d & 0x1f;
 353                         return;
 354
 355                 case 0x5E: // .Reg_IM_Adr
 356                         _rot_comp.Reg_5E = d & 0xFFF8;
 357                         return;
 358
 359                 case 0x60: // .Reg_IM_Offset
 360                         _rot_comp.Reg_60 = d & 0x3f;
 361                         return;
 362
 363                 case 0x62: // .Reg_IM_HDot_Size
 364                         _rot_comp.Reg_62 = d & 0x1ff;
 365                         return;
 366
 367                 case 0x64: // .Reg_IM_VDot_Size
 368                         _rot_comp.Reg_64 = d & 0xff;    // V_Dot, must be 32bit?
 369                         return;
 370
 371                 case 0x66: // .Reg_Vector_Adr
 372                         _rot_comp.Reg_66 = d & 0xfffe;
 373                         if (Pico_mcd->s68k_regs[3]&4) return; // can't do tanformations in 1M mode
 374                         gfx_cd_start();
 375                         return;
 376
 377                 default: dprintf("gfx_cd_write16 FIXME: unexpected address: %02x", a); return;
 378         }
 379 }
 380
 381
 382 PICO_INTERNAL void gfx_cd_reset(void)
 383 {
 384         memset(&_rot_comp.Reg_58, 0, sizeof(_rot_comp));
 385 }
 386
 387
 388 // --------------------------------
 389
 390 #include "cell_map.c"
 391
 392 #ifndef UTYPES_DEFINED
 393 typedef unsigned short u16;
 394 #endif
 395
 396 // check: Heart of the alien, jaguar xj 220
 397 PICO_INTERNAL void DmaSlowCell(unsigned int source, unsigned int a, int len, unsigned char inc)
 398 {
 399   unsigned char *base;
 400   unsigned int asrc, a2;
 401   u16 *r;
 402
 403   base = Pico_mcd->word_ram1M[Pico_mcd->s68k_regs[3]&1];
 404
 405   switch (Pico.video.type)
 406   {
 407     case 1: // vram
 408       r = Pico.vram;
 409       for(; len; len--)
 410       {
 411         asrc = cell_map(source >> 2) << 2;
 412         asrc |= source & 2;
 413         // if(a&1) d=(d<<8)|(d>>8); // ??
 414         r[a>>1] = *(u16 *)(base + asrc);
 415         source += 2;
 416         // AutoIncrement
 417         a=(u16)(a+inc);
 418       }
 419       rendstatus |= PDRAW_SPRITES_MOVED;
 420       break;
 421
 422     case 3: // cram
 423       Pico.m.dirtyPal = 1;
 424       r = Pico.cram;
 425       for(a2=a&0x7f; len; len--)
 426       {
 427         asrc = cell_map(source >> 2) << 2;
 428         asrc |= source & 2;
 429         r[a2>>1] = *(u16 *)(base + asrc);
 430         source += 2;
 431         // AutoIncrement
 432         a2+=inc;
 433         // good dest?
 434         if(a2 >= 0x80) break;
 435       }
 436       a=(a&0xff00)|a2;
 437       break;
 438
 439     case 5: // vsram[a&0x003f]=d;
 440       r = Pico.vsram;
 441       for(a2=a&0x7f; len; len--)
 442       {
 443         asrc = cell_map(source >> 2) << 2;
 444         asrc |= source & 2;
 445         r[a2>>1] = *(u16 *)(base + asrc);
 446         source += 2;
 447         // AutoIncrement
 448         a2+=inc;
 449         // good dest?
 450         if(a2 >= 0x80) break;
 451       }
 452       a=(a&0xff00)|a2;
 453       break;
 454   }
 455   // remember addr
 456   Pico.video.addr=(u16)a;
 457 }
 458