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