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 _rot_comp Pico_mcd->rot_comp
  14
  15 static const int Table_Rot_Time[] =
  16 {
  17         0x00054000, 0x00048000, 0x00040000, 0x00036000,          //; 008-032               ; briefing - sprite
  18         0x0002E000, 0x00028000, 0x00024000, 0x00022000,          //; 036-064               ; arbre souvent
  19         0x00021000, 0x00020000, 0x0001E000, 0x0001B800,          //; 068-096               ; map thunderstrike
  20         0x00019800, 0x00017A00, 0x00015C00, 0x00013E00,          //; 100-128               ; logo défoncé
  21
  22         0x00012000, 0x00011800, 0x00011000, 0x00010800,          //; 132-160               ; briefing - map
  23         0x00010000, 0x0000F800, 0x0000F000, 0x0000E800,          //; 164-192
  24         0x0000E000, 0x0000D800, 0x0000D000, 0x0000C800,          //; 196-224
  25         0x0000C000, 0x0000B800, 0x0000B000, 0x0000A800,          //; 228-256               ; batman visage
  26
  27         0x0000A000, 0x00009F00, 0x00009E00, 0x00009D00,          //; 260-288
  28         0x00009C00, 0x00009B00, 0x00009A00, 0x00009900,          //; 292-320
  29         0x00009800, 0x00009700, 0x00009600, 0x00009500,          //; 324-352
  30         0x00009400, 0x00009300, 0x00009200, 0x00009100,          //; 356-384
  31
  32         0x00009000, 0x00008F00, 0x00008E00, 0x00008D00,          //; 388-416
  33         0x00008C00, 0x00008B00, 0x00008A00, 0x00008900,          //; 420-448
  34         0x00008800, 0x00008700, 0x00008600, 0x00008500,          //; 452-476
  35         0x00008400, 0x00008300, 0x00008200, 0x00008100,          //; 480-512
  36 };
  37
  38
  39 static void gfx_cd_start(void)
  40 {
  41         int upd_len;
  42
  43         // _rot_comp.XD_Mul = ((_rot_comp.Reg_5C & 0x1f) + 1) * 4; // unused
  44         _rot_comp.Function = (_rot_comp.Reg_58 & 7) | (Pico_mcd->s68k_regs[3] & 0x18);  // Jmp_Adr
  45         // _rot_comp.Buffer_Adr = (_rot_comp.Reg_5E & 0xfff8) << 2; // unused?
  46         _rot_comp.YD = (_rot_comp.Reg_60 >> 3) & 7;
  47         _rot_comp.Vector_Adr = (_rot_comp.Reg_66 & 0xfffe) << 2;
  48
  49         upd_len = (_rot_comp.Reg_62 >> 3) & 0x3f;
  50         upd_len = Table_Rot_Time[upd_len];
  51         _rot_comp.Draw_Speed = _rot_comp.Float_Part = upd_len;
  52
  53         _rot_comp.Reg_58 |= 0x8000;     // Stamp_Size,  we start a new GFX operation
  54
  55         switch (_rot_comp.Reg_58 & 6)   // Scr_16?
  56         {
  57                 case 0: // ?
  58                         _rot_comp.Stamp_Map_Adr = (_rot_comp.Reg_5A & 0xff80) << 2;
  59                         break;
  60                 case 2: // .Dot_32
  61                         _rot_comp.Stamp_Map_Adr = (_rot_comp.Reg_5A & 0xffe0) << 2;
  62                         break;
  63                 case 4: // .Scr_16
  64                         _rot_comp.Stamp_Map_Adr = 0x20000;
  65                         break;
  66                 case 6: // .Scr_16_Dot_32
  67                         _rot_comp.Stamp_Map_Adr = (_rot_comp.Reg_5A & 0xe000) << 2;
  68                         break;
  69         }
  70
  71         dprintf("gfx_cd_start, stamp_map_addr=%06x", _rot_comp.Stamp_Map_Adr);
  72
  73         gfx_cd_update();
  74 }
  75
  76
  77 static void gfx_completed(void)
  78 {
  79         _rot_comp.Reg_58 &= 0x7fff;     // Stamp_Size
  80         _rot_comp.Reg_64  = 0;
  81         if (Pico_mcd->s68k_regs[0x33] & (1<<1))
  82         {
  83                 elprintf(EL_INTS, "gfx_cd irq 1");
  84                 SekInterruptS68k(1);
  85         }
  86 }
  87
  88
  89 static void gfx_do(unsigned int func, unsigned short *stamp_base, unsigned int H_Dot)
  90 {
  91         unsigned int eax, ebx, ecx, edx, esi, edi, pixel;
  92         unsigned int XD, Buffer_Adr;
  93         int DYXS;
  94
  95         XD = _rot_comp.Reg_60 & 7;
  96         Buffer_Adr = ((_rot_comp.Reg_5E & 0xfff8) + _rot_comp.YD) << 2;
  97         ecx = *(unsigned int *)(Pico_mcd->word_ram2M + _rot_comp.Vector_Adr);
  98         edx = ecx >> 16;
  99         ecx = (ecx & 0xffff) << 8;
 100         edx <<= 8;
 101         DYXS = *(int *)(Pico_mcd->word_ram2M + _rot_comp.Vector_Adr + 4);
 102         _rot_comp.Vector_Adr += 8;
 103
 104         // MAKE_IMAGE_LINE
 105         while (H_Dot)
 106         {
 107                 // MAKE_IMAGE_PIXEL
 108                 if (!(func & 1))        // NOT TILED
 109                 {
 110                         int mask = (func & 4) ? 0x00800000 : 0x00f80000;
 111                         if ((ecx | edx) & mask)
 112                         {
 113                                 if (func & 0x18) goto Next_Pixel;
 114                                 pixel = 0;
 115                                 goto Pixel_Out;
 116                         }
 117                 }
 118
 119                 if (func & 2)           // mode 32x32 dot
 120                 {
 121                         if (func & 4)   // 16x16 screen
 122                         {
 123                                 ebx = ((ecx >> (11+5)) & 0x007f) |
 124                                       ((edx >> (11-2)) & 0x3f80);
 125                         }
 126                         else            // 1x1 screen
 127                         {
 128                                 ebx = ((ecx >> (11+5)) & 0x07) |
 129                                       ((edx >> (11+2)) & 0x38);
 130                         }
 131                 }
 132                 else                    // mode 16x16 dot
 133                 {
 134                         if (func & 4)   // 16x16 screen
 135                         {
 136                                 ebx = ((ecx >> (11+4)) & 0x00ff) |
 137                                       ((edx >> (11-4)) & 0xff00);
 138                         }
 139                         else            // 1x1 screen
 140                         {
 141                                 ebx = ((ecx >> (11+4)) & 0x0f) |
 142                                       ((edx >> (11+0)) & 0xf0);
 143                         }
 144                 }
 145
 146                 edi = stamp_base[ebx];
 147                 esi = (edi & 0x7ff) << 7;
 148                 if (!esi) { pixel = 0; goto Pixel_Out; }
 149                 edi >>= (11+1);
 150                 edi &= (0x1c>>1);
 151                 eax = ecx;
 152                 ebx = edx;
 153                 if (func & 2) edi |= 1; // 32 dots?
 154                 switch (edi)
 155                 {
 156                         case 0x00:      // No_Flip_0, 16x16 dots
 157                                 ebx = (ebx >> 9) & 0x3c;
 158                                 ebx += esi;
 159                                 edi = (eax & 0x3800) ^ 0x1000;          // bswap
 160                                 eax = ((eax >> 8) & 0x40) + ebx;
 161                                 break;
 162                         case 0x01:      // No_Flip_0, 32x32 dots
 163                                 ebx = (ebx >> 9) & 0x7c;
 164                                 ebx += esi;
 165                                 edi = (eax & 0x3800) ^ 0x1000;          // bswap
 166                                 eax = ((eax >> 7) & 0x180) + ebx;
 167                                 break;
 168                         case 0x02:      // No_Flip_90, 16x16 dots
 169                                 eax = (eax >> 9) & 0x3c;
 170                                 eax += esi;
 171                                 edi = (ebx & 0x3800) ^ 0x2800;          // bswap
 172                                 eax += ((ebx >> 8) & 0x40) ^ 0x40;
 173                                 break;
 174                         case 0x03:      // No_Flip_90, 32x32 dots
 175                                 eax = (eax >> 9) & 0x7c;
 176                                 eax += esi;
 177                                 edi = (ebx & 0x3800) ^ 0x2800;          // bswap
 178                                 eax += ((ebx >> 7) & 0x180) ^ 0x180;
 179                                 break;
 180                         case 0x04:      // No_Flip_180, 16x16 dots
 181                                 ebx = ((ebx >> 9) & 0x3c) ^ 0x3c;
 182                                 ebx += esi;
 183                                 edi = (eax & 0x3800) ^ 0x2800;          // bswap and flip
 184                                 eax = (((eax >> 8) & 0x40) ^ 0x40) + ebx;
 185                                 break;
 186                         case 0x05:      // No_Flip_180, 32x32 dots
 187                                 ebx = ((ebx >> 9) & 0x7c) ^ 0x7c;
 188                                 ebx += esi;
 189                                 edi = (eax & 0x3800) ^ 0x2800;          // bswap and flip
 190                                 eax = (((eax >> 7) & 0x180) ^ 0x180) + ebx;
 191                                 break;
 192                         case 0x06:      // No_Flip_270, 16x16 dots
 193                                 eax = ((eax >> 9) & 0x3c) ^ 0x3c;
 194                                 eax += esi;
 195                                 edi = (ebx & 0x3800) ^ 0x1000;          // bswap
 196                                 eax += (ebx >> 8) & 0x40;
 197                                 break;
 198                         case 0x07:      // No_Flip_270, 32x32 dots
 199                                 eax = ((eax >> 9) & 0x7c) ^ 0x7c;
 200                                 eax += esi;
 201                                 edi = (ebx & 0x3800) ^ 0x1000;          // bswap
 202                                 eax += (ebx >> 7) & 0x180;
 203                                 break;
 204                         case 0x08:      // Flip_0, 16x16 dots
 205                                 ebx = (ebx >> 9) & 0x3c;
 206                                 ebx += esi;
 207                                 edi = (eax & 0x3800) ^ 0x2800;          // bswap, flip
 208                                 eax = (((eax >> 8) & 0x40) ^ 0x40) + ebx;
 209                                 break;
 210                         case 0x09:      // Flip_0, 32x32 dots
 211                                 ebx = (ebx >> 9) & 0x7c;
 212                                 ebx += esi;
 213                                 edi = (eax & 0x3800) ^ 0x2800;          // bswap, flip
 214                                 eax = (((eax >> 7) & 0x180) ^ 0x180) + ebx;
 215                                 break;
 216                         case 0x0a:      // Flip_90, 16x16 dots
 217                                 eax = ((eax >> 9) & 0x3c) ^ 0x3c;
 218                                 eax += esi;
 219                                 edi = (ebx & 0x3800) ^ 0x2800;          // bswap, flip
 220                                 eax += ((ebx >> 8) & 0x40) ^ 0x40;
 221                                 break;
 222                         case 0x0b:      // Flip_90, 32x32 dots
 223                                 eax = ((eax >> 9) & 0x7c) ^ 0x7c;
 224                                 eax += esi;
 225                                 edi = (ebx & 0x3800) ^ 0x2800;          // bswap, flip
 226                                 eax += ((ebx >> 7) & 0x180) ^ 0x180;
 227                                 break;
 228                         case 0x0c:      // Flip_180, 16x16 dots
 229                                 ebx = ((ebx >> 9) & 0x3c) ^ 0x3c;
 230                                 ebx += esi;
 231                                 edi = (eax & 0x3800) ^ 0x1000;          // bswap
 232                                 eax = ((eax >> 8) & 0x40) + ebx;
 233                                 break;
 234                         case 0x0d:      // Flip_180, 32x32 dots
 235                                 ebx = ((ebx >> 9) & 0x7c) ^ 0x7c;
 236                                 ebx += esi;
 237                                 edi = (eax & 0x3800) ^ 0x1000;          // bswap
 238                                 eax = ((eax >> 7) & 0x180) + ebx;
 239                                 break;
 240                         case 0x0e:      // Flip_270, 16x16 dots
 241                                 eax = (eax >> 9) & 0x3c;
 242                                 eax += esi;
 243                                 edi = (ebx & 0x3800) ^ 0x1000;          // bswap, flip
 244                                 eax += (ebx >> 8) & 0x40;
 245                                 break;
 246                         case 0x0f:      // Flip_270, 32x32 dots
 247                                 eax = (eax >> 9) & 0x7c;
 248                                 eax += esi;
 249                                 edi = (ebx & 0x3800) ^ 0x1000;          // bswap, flip
 250                                 eax += (ebx >> 7) & 0x180;
 251                                 break;
 252                 }
 253
 254                 pixel = *(Pico_mcd->word_ram2M + (edi >> 12) + eax);
 255                 if (!(edi & 0x800)) pixel >>= 4;
 256                 else pixel &= 0x0f;
 257
 258 Pixel_Out:
 259                 if (!pixel && (func & 0x18)) goto Next_Pixel;
 260                 esi = Buffer_Adr + ((XD>>1)^1);                         // pixel addr
 261                 eax = *(Pico_mcd->word_ram2M + esi);                    // old pixel
 262                 if (XD & 1)
 263                 {
 264                         if ((eax & 0x0f) && (func & 0x18) == 0x08) goto Next_Pixel; // underwrite
 265                         *(Pico_mcd->word_ram2M + esi) = pixel | (eax & 0xf0);
 266                 }
 267                 else
 268                 {
 269                         if ((eax & 0xf0) && (func & 0x18) == 0x08) goto Next_Pixel; // underwrite
 270                         *(Pico_mcd->word_ram2M + esi) = (pixel << 4) | (eax & 0xf);
 271                 }
 272
 273
 274 Next_Pixel:
 275                 ecx += (DYXS << 16) >> 16;      // _rot_comp.DXS;
 276                 edx +=  DYXS >> 16;             // _rot_comp.DYS;
 277                 XD++;
 278                 if (XD >= 8)
 279                 {
 280                         Buffer_Adr += ((_rot_comp.Reg_5C & 0x1f) + 1) << 5;
 281                         XD = 0;
 282                 }
 283                 H_Dot--;
 284         }
 285         // end while
 286
 287
 288 // nothing_to_draw:
 289         _rot_comp.YD++;
 290         // _rot_comp.V_Dot--; // will be done by caller
 291 }
 292
 293
 294 PICO_INTERNAL void gfx_cd_update(void)
 295 {
 296         int V_Dot = _rot_comp.Reg_64 & 0xff;
 297         int jobs;
 298
 299         dprintf("gfx_cd_update, Reg_64 = %04x", _rot_comp.Reg_64);
 300
 301         if (!V_Dot)
 302         {
 303                 gfx_completed();
 304                 return;
 305         }
 306
 307         jobs = _rot_comp.Float_Part >> 16;
 308
 309         if (!jobs)
 310         {
 311                 _rot_comp.Float_Part += _rot_comp.Draw_Speed;
 312                 return;
 313         }
 314
 315         _rot_comp.Float_Part &= 0xffff;
 316         _rot_comp.Float_Part += _rot_comp.Draw_Speed;
 317
 318         if (PicoOpt & POPT_EN_MCD_GFX)
 319         {
 320                 unsigned int func = _rot_comp.Function;
 321                 unsigned int H_Dot = _rot_comp.Reg_62 & 0x1ff;
 322                 unsigned short *stamp_base = (unsigned short *) (Pico_mcd->word_ram2M + _rot_comp.Stamp_Map_Adr);
 323
 324                 while (jobs--)
 325                 {
 326                         gfx_do(func, stamp_base, H_Dot);        // jmp [Jmp_Adr]:
 327
 328                         V_Dot--;                                // dec byte [V_Dot]
 329                         if (V_Dot == 0)
 330                         {
 331                                 // GFX_Completed:
 332                                 gfx_completed();
 333                                 return;
 334                         }
 335                 }
 336         }
 337         else
 338         {
 339                 if (jobs >= V_Dot)
 340                 {
 341                         gfx_completed();
 342                         return;
 343                 }
 344                 V_Dot -= jobs;
 345         }
 346
 347         _rot_comp.Reg_64 = V_Dot;
 348 }
 349
 350
 351 PICO_INTERNAL_ASM unsigned int gfx_cd_read(unsigned int a)
 352 {
 353         unsigned int d = 0;
 354
 355         switch (a) {
 356                 case 0x58: d = _rot_comp.Reg_58; break;
 357                 case 0x5A: d = _rot_comp.Reg_5A; break;
 358                 case 0x5C: d = _rot_comp.Reg_5C; break;
 359                 case 0x5E: d = _rot_comp.Reg_5E; break;
 360                 case 0x60: d = _rot_comp.Reg_60; break;
 361                 case 0x62: d = _rot_comp.Reg_62; break;
 362                 case 0x64: d = _rot_comp.Reg_64; break;
 363                 case 0x66: break;
 364                 default: dprintf("gfx_cd_read FIXME: unexpected address: %02x", a); break;
 365         }
 366
 367         dprintf("gfx_cd_read(%02x) = %04x", a, d);
 368
 369         return d;
 370 }
 371
 372 PICO_INTERNAL_ASM void gfx_cd_write16(unsigned int a, unsigned int d)
 373 {
 374         dprintf("gfx_cd_write16(%x, %04x)", a, d);
 375
 376         switch (a) {
 377                 case 0x58: // .Reg_Stamp_Size
 378                         _rot_comp.Reg_58 = d & 7;
 379                         return;
 380
 381                 case 0x5A: // .Reg_Stamp_Adr
 382                         _rot_comp.Reg_5A = d & 0xffe0;
 383                         return;
 384
 385                 case 0x5C: // .Reg_IM_VCell_Size
 386                         _rot_comp.Reg_5C = d & 0x1f;
 387                         return;
 388
 389                 case 0x5E: // .Reg_IM_Adr
 390                         _rot_comp.Reg_5E = d & 0xFFF8;
 391                         return;
 392
 393                 case 0x60: // .Reg_IM_Offset
 394                         _rot_comp.Reg_60 = d & 0x3f;
 395                         return;
 396
 397                 case 0x62: // .Reg_IM_HDot_Size
 398                         _rot_comp.Reg_62 = d & 0x1ff;
 399                         return;
 400
 401                 case 0x64: // .Reg_IM_VDot_Size
 402                         _rot_comp.Reg_64 = d & 0xff;    // V_Dot, must be 32bit?
 403                         return;
 404
 405                 case 0x66: // .Reg_Vector_Adr
 406                         _rot_comp.Reg_66 = d & 0xfffe;
 407                         if (Pico_mcd->s68k_regs[3]&4) return; // can't do tanformations in 1M mode
 408                         gfx_cd_start();
 409                         return;
 410
 411                 default: dprintf("gfx_cd_write16 FIXME: unexpected address: %02x", a); return;
 412         }
 413 }
 414
 415
 416 PICO_INTERNAL void gfx_cd_reset(void)
 417 {
 418         memset(&_rot_comp.Reg_58, 0, sizeof(_rot_comp));
 419 }
 420
 421
 422 // --------------------------------
 423
 424 #include "cell_map.c"
 425
 426 #ifndef UTYPES_DEFINED
 427 typedef unsigned short u16;
 428 #endif
 429
 430 // check: Heart of the alien, jaguar xj 220
 431 PICO_INTERNAL void DmaSlowCell(unsigned int source, unsigned int a, int len, unsigned char inc)
 432 {
 433   unsigned char *base;
 434   unsigned int asrc, a2;
 435   u16 *r;
 436
 437   base = Pico_mcd->word_ram1M[Pico_mcd->s68k_regs[3]&1];
 438
 439   switch (Pico.video.type)
 440   {
 441     case 1: // vram
 442       r = Pico.vram;
 443       for(; len; len--)
 444       {
 445         asrc = cell_map(source >> 2) << 2;
 446         asrc |= source & 2;
 447         // if(a&1) d=(d<<8)|(d>>8); // ??
 448         r[a>>1] = *(u16 *)(base + asrc);
 449         source += 2;
 450         // AutoIncrement
 451         a=(u16)(a+inc);
 452       }
 453       rendstatus |= PDRAW_SPRITES_MOVED;
 454       break;
 455
 456     case 3: // cram
 457       Pico.m.dirtyPal = 1;
 458       r = Pico.cram;
 459       for(a2=a&0x7f; len; len--)
 460       {
 461         asrc = cell_map(source >> 2) << 2;
 462         asrc |= source & 2;
 463         r[a2>>1] = *(u16 *)(base + asrc);
 464         source += 2;
 465         // AutoIncrement
 466         a2+=inc;
 467         // good dest?
 468         if(a2 >= 0x80) break;
 469       }
 470       a=(a&0xff00)|a2;
 471       break;
 472
 473     case 5: // vsram[a&0x003f]=d;
 474       r = Pico.vsram;
 475       for(a2=a&0x7f; len; len--)
 476       {
 477         asrc = cell_map(source >> 2) << 2;
 478         asrc |= source & 2;
 479         r[a2>>1] = *(u16 *)(base + asrc);
 480         source += 2;
 481         // AutoIncrement
 482         a2+=inc;
 483         // good dest?
 484         if(a2 >= 0x80) break;
 485       }
 486       a=(a&0xff00)|a2;
 487       break;
 488   }
 489   // remember addr
 490   Pico.video.addr=(u16)a;
 491 }
 492