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 "../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