Shamusworld >> Repos - virtualjaguar/blob - src/objectp.cpp

   1 //
   2 // Object Processor
   3 //
   4 // Original source by Cal2
   5 // GCC/SDL port by Niels Wagenaar (Linux/WIN32) and Caz (BeOS)
   6 // Extensive cleanups/fixes/rewrites by James L. Hammons
   7 //
   8
   9 //#include <stdio.h>
  10 //#include <stdlib.h>
  11 #include <string.h>
  12 #include "jaguar.h"
  13
  14 //#define OP_DEBUG
  15 //#define OP_DEBUG_BMP
  16
  17 #define BLEND_Y(dst, src)       op_blend_y[(((uint16)dst<<8)) | ((uint16)(src))]
  18 #define BLEND_CR(dst, src)      op_blend_cr[(((uint16)dst)<<8) | ((uint16)(src))]
  19
  20 #define OBJECT_TYPE_BITMAP      0                       // 000
  21 #define OBJECT_TYPE_SCALE       1                       // 001
  22 #define OBJECT_TYPE_GPU         2                       // 010
  23 #define OBJECT_TYPE_BRANCH      3                       // 011
  24 #define OBJECT_TYPE_STOP        4                       // 100
  25
  26 #define CONDITION_EQUAL                         0
  27 #define CONDITION_LESS_THAN                     1
  28 #define CONDITION_GREATER_THAN          2
  29 #define CONDITION_OP_FLAG_SET           3
  30 #define CONDITION_SECOND_HALF_LINE      4
  31
  32 #define OPFLAG_RELEASE          8                       // Bus release bit
  33 #define OPFLAG_TRANS            4                       // Transparency bit
  34 #define OPFLAG_RMW                      2                       // Read-Modify-Write bit
  35 #define OPFLAG_REFLECT          1                       // Horizontal mirror bit
  36
  37 // Private function prototypes
  38
  39 void OPProcessFixedBitmap(uint64 p0, uint64 p1, bool render);
  40 void OPProcessScaledBitmap(uint64 p0, uint64 p1, uint64 p2, bool render);
  41 void DumpScaledObject(uint64 p0, uint64 p1, uint64 p2);
  42 void DumpFixedObject(uint64 p0, uint64 p1);
  43 uint64 op_load_phrase(uint32 offset);
  44
  45 // Local global variables
  46
  47 static uint8 * op_blend_y;
  48 static uint8 * op_blend_cr;
  49 // There may be a problem with this "RAM" overlapping (and thus being independent of)
  50 // some of the regular TOM RAM...
  51 static uint8 objectp_ram[0x40];                 // This is based at $F00000
  52 uint8 objectp_running;
  53 //bool objectp_stop_reading_list;
  54
  55 static uint8 op_bitmap_bit_depth[8] = { 1, 2, 4, 8, 16, 24, 32, 0 };
  56 //static uint32 op_bitmap_bit_size[8] =
  57 //      { (uint32)(0.125*65536), (uint32)(0.25*65536), (uint32)(0.5*65536), (uint32)(1*65536),
  58 //        (uint32)(2*65536),     (uint32)(1*65536),    (uint32)(1*65536),   (uint32)(1*65536) };
  59 static uint32 op_pointer;
  60
  61 int32 phraseWidthToPixels[8] = { 64, 32, 16, 8, 4, 2, 0, 0 };
  62
  63
  64 //
  65 // Object Processor initialization
  66 //
  67 void op_init(void)
  68 {
  69         // Blend tables (64K each)
  70         memory_malloc_secure((void **)&op_blend_y, 0x10000, "Jaguar Object processor Y blend lookup table");
  71         memory_malloc_secure((void **)&op_blend_cr, 0x10000, "Jaguar Object processor CR blend lookup table");
  72
  73         // Here we calculate the saturating blend of a signed 4-bit value and an
  74         // existing Cyan/Red value as well as a signed 8-bit value and an existing intensity...
  75         // Note: CRY is 4 bits Cyan, 4 bits Red, 16 bits intensitY
  76         for(int i=0; i<256*256; i++)
  77         {
  78                 int y = (i >> 8) & 0xFF;
  79                 int dy = (INT8)i;                                       // Sign extend the Y index
  80                 int c1 = (i >> 8) & 0x0F;
  81                 int dc1 = (INT8)(i << 4) >> 4;          // Sign extend the R index
  82                 int c2 = (i >> 12) & 0x0F;
  83                 int dc2 = (INT8)(i & 0xF0) >> 4;        // Sign extend the C index
  84
  85                 y += dy;
  86                 if (y < 0)
  87                         y = 0;
  88                 else if (y > 0xFF)
  89                         y = 0xFF;
  90                 op_blend_y[i] = y;
  91
  92                 c1 += dc1;
  93                 if (c1 < 0)
  94                         c1 = 0;
  95                 else if (c1 > 0x0F)
  96                         c1 = 0x0F;
  97                 c2 += dc2;
  98
  99                 if (c2 < 0)
 100                         c2 = 0;
 101                 else if (c2 > 0x0F)
 102                         c2 = 0x0F;
 103                 op_blend_cr[i] = (c2 << 4) | c1;
 104         }
 105
 106         op_reset();
 107 }
 108
 109 //
 110 // Object Processor reset
 111 //
 112 void op_reset(void)
 113 {
 114         memset(objectp_ram, 0x00, 0x40);
 115         objectp_running = 0;
 116 }
 117
 118 void op_done(void)
 119 {
 120         char * opType[8] =
 121         { "(BITMAP)", "(SCALED BITMAP)", "(GPU INT)", "(BRANCH)", "(STOP)", "???", "???", "???" };
 122         char * ccType[8] =
 123                 { "\"==\"", "\"<\"", "\">\"", "(opflag set)", "(second half line)", "?", "?", "?" };
 124
 125         uint32 olp = op_get_list_pointer();
 126         WriteLog("OP: OLP = %08X\n", olp);
 127         WriteLog("OP: Phrase dump\n    ----------\n");
 128         for(uint32 i=0; i<0x100; i+=8)
 129         {
 130                 uint32 hi = JaguarReadLong(olp + i, OP), lo = JaguarReadLong(olp + i + 4, OP);
 131                 WriteLog("\t%08X: %08X %08X %s", olp + i, hi, lo, opType[lo & 0x07]);
 132                 if ((lo & 0x07) == 3)
 133                 {
 134                         uint16 ypos = (lo >> 3) & 0x7FF;
 135                         uint8  cc   = (lo >> 14) & 0x03;
 136                         uint32 link = ((hi << 11) | (lo >> 21)) & 0x3FFFF8;
 137                         WriteLog(" YPOS=%u, CC=%s, link=%08X", ypos, ccType[cc], link);
 138                 }
 139                 WriteLog("\n");
 140                 if ((lo & 0x07) == 0)
 141                         DumpFixedObject(op_load_phrase(olp+i), op_load_phrase(olp+i+8));
 142                 if ((lo & 0x07) == 1)
 143                         DumpScaledObject(op_load_phrase(olp+i), op_load_phrase(olp+i+8), op_load_phrase(olp+i+16));
 144         }
 145         WriteLog("\n");
 146
 147         memory_free(op_blend_y);
 148         memory_free(op_blend_cr);
 149 }
 150
 151 //
 152 // Object Processor memory access
 153 // Memory range: F00010 - F00027
 154 //
 155 //      F00010-F00017   R     xxxxxxxx xxxxxxxx   OB - current object code from the graphics processor
 156 //      F00020-F00023     W   xxxxxxxx xxxxxxxx   OLP - start of the object list
 157 //      F00026            W   -------- -------x   OBF - object processor flag
 158 //
 159
 160 uint8 OPReadByte(uint32 offset, uint32 who/*=UNKNOWN*/)
 161 {
 162         offset &= 0x3F;
 163         return objectp_ram[offset];
 164 }
 165
 166 uint16 OPReadWord(uint32 offset, uint32 who/*=UNKNOWN*/)
 167 {
 168         offset &= 0x3F;
 169         return GET16(objectp_ram, offset);
 170 }
 171
 172 void OPWriteByte(uint32 offset, uint8 data, uint32 who/*=UNKNOWN*/)
 173 {
 174         offset &= 0x3F;
 175         objectp_ram[offset] = data;
 176 }
 177
 178 void OPWriteWord(uint32 offset, uint16 data, uint32 who/*=UNKNOWN*/)
 179 {
 180         offset &= 0x3F;
 181         SET16(objectp_ram, offset, data);
 182
 183 /*if (offset == 0x20)
 184 WriteLog("OP: Setting lo list pointer: %04X\n", data);
 185 if (offset == 0x22)
 186 WriteLog("OP: Setting hi list pointer: %04X\n", data);//*/
 187 }
 188
 189 uint32 op_get_list_pointer(void)
 190 {
 191         // Note: This register is LO / HI WORD, hence the funky look of this...
 192 //      return (objectp_ram[0x22] << 24) | (objectp_ram[0x23] << 16) | (objectp_ram[0x20] << 8) | objectp_ram[0x21];
 193         return GET16(objectp_ram, 0x20) | (GET16(objectp_ram, 0x22) << 16);
 194 }
 195
 196 // This is WRONG, since the OBF is only 16 bits wide!!! [FIXED]
 197
 198 uint32 op_get_status_register(void)
 199 {
 200 //      return (objectp_ram[0x26] << 24) | (objectp_ram[0x27] << 16) | (objectp_ram[0x28] << 8) | objectp_ram[0x29];
 201 //      return GET32(objectp_ram, 0x26);
 202         return GET16(objectp_ram, 0x26);
 203 }
 204
 205 // This is WRONG, since the OBF is only 16 bits wide!!! [FIXED]
 206
 207 void op_set_status_register(uint32 data)
 208 {
 209 /*      objectp_ram[0x26] = (data & 0xFF000000) >> 24;
 210         objectp_ram[0x27] = (data & 0x00FF0000) >> 16;
 211         objectp_ram[0x28] = (data & 0x0000FF00) >> 8;
 212         objectp_ram[0x29] |= (data & 0xFE);*/
 213         objectp_ram[0x26] = (data & 0x0000FF00) >> 8;
 214         objectp_ram[0x27] |= (data & 0xFE);
 215 }
 216
 217 void op_set_current_object(uint64 object)
 218 {
 219 //Not sure this is right... Wouldn't it just be stored 64 bit BE?
 220         // Stored as least significant 32 bits first, ms32 last in big endian
 221 /*      objectp_ram[0x13] = object & 0xFF; object >>= 8;
 222         objectp_ram[0x12] = object & 0xFF; object >>= 8;
 223         objectp_ram[0x11] = object & 0xFF; object >>= 8;
 224         objectp_ram[0x10] = object & 0xFF; object >>= 8;
 225
 226         objectp_ram[0x17] = object & 0xFF; object >>= 8;
 227         objectp_ram[0x16] = object & 0xFF; object >>= 8;
 228         objectp_ram[0x15] = object & 0xFF; object >>= 8;
 229         objectp_ram[0x14] = object & 0xFF;*/
 230 // Let's try regular good old big endian...
 231         objectp_ram[0x17] = object & 0xFF; object >>= 8;
 232         objectp_ram[0x16] = object & 0xFF; object >>= 8;
 233         objectp_ram[0x15] = object & 0xFF; object >>= 8;
 234         objectp_ram[0x14] = object & 0xFF; object >>= 8;
 235
 236         objectp_ram[0x13] = object & 0xFF; object >>= 8;
 237         objectp_ram[0x12] = object & 0xFF; object >>= 8;
 238         objectp_ram[0x11] = object & 0xFF; object >>= 8;
 239         objectp_ram[0x10] = object & 0xFF;
 240 }
 241
 242 uint64 op_load_phrase(uint32 offset)
 243 {
 244         offset &= ~0x07;                                                // 8 byte alignment
 245         return ((uint64)JaguarReadLong(offset, OP) << 32) | (uint64)JaguarReadLong(offset+4, OP);
 246 }
 247
 248 void OPStorePhrase(uint32 offset, uint64 p)
 249 {
 250         offset &= ~0x07;                                                // 8 byte alignment
 251         JaguarWriteLong(offset, p >> 32, OP);
 252         JaguarWriteLong(offset + 4, p & 0xFFFFFFFF, OP);
 253 }
 254
 255 //
 256 // Debugging routines
 257 //
 258 void DumpScaledObject(uint64 p0, uint64 p1, uint64 p2)
 259 {
 260         WriteLog(" (SCALED BITMAP)");
 261         WriteLog(" %08X --> phrase %08X %08X\n", op_pointer, (uint32)(p1>>32), (uint32)(p1&0xFFFFFFFF));
 262         WriteLog("                 %08X --> phrase %08X %08X ", op_pointer+8, (uint32)(p2>>32), (uint32)(p2&0xFFFFFFFF));
 263         uint8 bitdepth = (p1 >> 12) & 0x07;
 264 //WAS:  int16 ypos = ((p0 >> 3) & 0x3FF);                       // ??? What if not interlaced (/2)?
 265         int16 ypos = ((p0 >> 3) & 0x7FF);                       // ??? What if not interlaced (/2)?
 266         int32 xpos = p1 & 0xFFF;
 267         xpos = (xpos & 0x800 ? xpos | 0xFFFFF000 : xpos);
 268         uint32 iwidth = ((p1 >> 28) & 0x3FF);
 269         uint32 dwidth = ((p1 >> 18) & 0x3FF);           // Unsigned!
 270         uint16 height = ((p0 >> 14) & 0x3FF);
 271         uint32 link = ((p0 >> 24) & 0x7FFFF) << 3;
 272         uint32 ptr = ((p0 >> 43) & 0x1FFFFF) << 3;
 273         uint32 firstPix = (p1 >> 49) & 0x3F;
 274         uint8 flags = (p1 >> 45) & 0x0F;
 275         uint8 idx = (p1 >> 38) & 0x7F;
 276         uint32 pitch = (p1 >> 15) & 0x07;
 277         WriteLog("\n    [%u (%u) x %u @ (%i, %u) (%u bpp), l: %08X, p: %08X fp: %02X, fl:%s%s%s%s, idx:%02X, pt:%02X]\n",
 278                 iwidth, dwidth, height, xpos, ypos, op_bitmap_bit_depth[bitdepth], link, ptr, firstPix, (flags&OPFLAG_REFLECT ? "REFLECT " : ""), (flags&OPFLAG_RMW ? "RMW " : ""), (flags&OPFLAG_TRANS ? "TRANS " : ""), (flags&OPFLAG_RELEASE ? "RELEASE" : ""), idx, pitch);
 279         uint32 hscale = p2 & 0xFF;
 280         uint32 vscale = (p2 >> 8) & 0xFF;
 281         uint32 remainder = (p2 >> 16) & 0xFF;
 282         WriteLog("    [hsc: %02X, vsc: %02X, rem: %02X]\n", hscale, vscale, remainder);
 283 }
 284
 285 void DumpFixedObject(uint64 p0, uint64 p1)
 286 {
 287         WriteLog(" (BITMAP)");
 288         WriteLog(" %08X --> phrase %08X %08X\n", op_pointer, (uint32)(p1>>32), (uint32)(p1&0xFFFFFFFF));
 289         uint8 bitdepth = (p1 >> 12) & 0x07;
 290 //WAS:  int16 ypos = ((p0 >> 3) & 0x3FF);                       // ??? What if not interlaced (/2)?
 291         int16 ypos = ((p0 >> 3) & 0x7FF);                       // ??? What if not interlaced (/2)?
 292         int32 xpos = p1 & 0xFFF;
 293         xpos = (xpos & 0x800 ? xpos | 0xFFFFF000 : xpos);
 294         uint32 iwidth = ((p1 >> 28) & 0x3FF);
 295         uint32 dwidth = ((p1 >> 18) & 0x3FF);           // Unsigned!
 296         uint16 height = ((p0 >> 14) & 0x3FF);
 297         uint32 link = ((p0 >> 24) & 0x7FFFF) << 3;
 298         uint32 ptr = ((p0 >> 43) & 0x1FFFFF) << 3;
 299         uint32 firstPix = (p1 >> 49) & 0x3F;
 300         uint8 flags = (p1 >> 45) & 0x0F;
 301         uint8 idx = (p1 >> 38) & 0x7F;
 302         uint32 pitch = (p1 >> 15) & 0x07;
 303         WriteLog("    [%u (%u) x %u @ (%i, %u) (%u bpp), l: %08X, p: %08X fp: %02X, fl:%s%s%s%s, idx:%02X, pt:%02X]\n",
 304                 iwidth, dwidth, height, xpos, ypos, op_bitmap_bit_depth[bitdepth], link, ptr, firstPix, (flags&OPFLAG_REFLECT ? "REFLECT " : ""), (flags&OPFLAG_RMW ? "RMW " : ""), (flags&OPFLAG_TRANS ? "TRANS " : ""), (flags&OPFLAG_RELEASE ? "RELEASE" : ""), idx, pitch);
 305 }
 306
 307 //
 308 // Object Processor main routine
 309 //
 310 //Need to fix this so that when an GPU object IRQ happens, we can pick up OP processing
 311 //where we left off. !!! FIX !!!
 312 void OPProcessList(int scanline, bool render)
 313 {
 314 extern int op_start_log;
 315 //      char * condition_to_str[8] =
 316 //              { "==", "<", ">", "(opflag set)", "(second half line)", "?", "?", "?" };
 317
 318         op_pointer = op_get_list_pointer();
 319
 320 //      objectp_stop_reading_list = false;
 321
 322 //WriteLog("OP: Processing line #%u (OLP=%08X)...\n", scanline, op_pointer);
 323 //op_done();
 324
 325 // *** BEGIN OP PROCESSOR TESTING ONLY ***
 326 extern bool interactiveMode;
 327 extern bool iToggle;
 328 extern int objectPtr;
 329 bool inhibit;
 330 int bitmapCounter = 0;
 331 // *** END OP PROCESSOR TESTING ONLY ***
 332
 333         uint32 opCyclesToRun = 10000;                                   // This is a pulled-out-of-the-air value (will need to be fixed, obviously!)
 334
 335 //      if (op_pointer) WriteLog(" new op list at 0x%.8x scanline %i\n",op_pointer,scanline);
 336         while (op_pointer)
 337         {
 338 // *** BEGIN OP PROCESSOR TESTING ONLY ***
 339 if (interactiveMode && bitmapCounter == objectPtr)
 340         inhibit = iToggle;
 341 else
 342         inhibit = false;
 343 // *** END OP PROCESSOR TESTING ONLY ***
 344 //              if (objectp_stop_reading_list)
 345 //                      return;
 346
 347                 uint64 p0 = op_load_phrase(op_pointer);
 348 //WriteLog("\t%08X type %i\n", op_pointer, (uint8)p0 & 0x07);
 349                 op_pointer += 8;
 350 if (scanline == tom_get_vdb() && op_start_log)
 351 //if (scanline == 215 && op_start_log)
 352 //if (scanline == 28 && op_start_log)
 353 {
 354 WriteLog("%08X --> phrase %08X %08X", op_pointer - 8, (int)(p0>>32), (int)(p0&0xFFFFFFFF));
 355 if ((p0 & 0x07) == OBJECT_TYPE_BITMAP)
 356 {
 357 WriteLog(" (BITMAP) ");
 358 uint64 p1 = op_load_phrase(op_pointer);
 359 WriteLog("\n%08X --> phrase %08X %08X ", op_pointer, (int)(p1>>32), (int)(p1&0xFFFFFFFF));
 360         uint8 bitdepth = (p1 >> 12) & 0x07;
 361 //WAS:  int16 ypos = ((p0 >> 3) & 0x3FF);                       // ??? What if not interlaced (/2)?
 362         int16 ypos = ((p0 >> 3) & 0x7FF);                       // ??? What if not interlaced (/2)?
 363 int32 xpos = p1 & 0xFFF;
 364 xpos = (xpos & 0x800 ? xpos | 0xFFFFF000 : xpos);
 365         uint32 iwidth = ((p1 >> 28) & 0x3FF);
 366         uint32 dwidth = ((p1 >> 18) & 0x3FF);           // Unsigned!
 367         uint16 height = ((p0 >> 14) & 0x3FF);
 368         uint32 link = ((p0 >> 24) & 0x7FFFF) << 3;
 369         uint32 ptr = ((p0 >> 43) & 0x1FFFFF) << 3;
 370         uint32 firstPix = (p1 >> 49) & 0x3F;
 371         uint8 flags = (p1 >> 45) & 0x0F;
 372         uint8 idx = (p1 >> 38) & 0x7F;
 373         uint32 pitch = (p1 >> 15) & 0x07;
 374 WriteLog("\n    [%u (%u) x %u @ (%i, %u) (%u bpp), l: %08X, p: %08X fp: %02X, fl:%s%s%s%s, idx:%02X, pt:%02X]\n",
 375         iwidth, dwidth, height, xpos, ypos, op_bitmap_bit_depth[bitdepth], link, ptr, firstPix, (flags&OPFLAG_REFLECT ? "REFLECT " : ""), (flags&OPFLAG_RMW ? "RMW " : ""), (flags&OPFLAG_TRANS ? "TRANS " : ""), (flags&OPFLAG_RELEASE ? "RELEASE" : ""), idx, pitch);
 376 }
 377 if ((p0 & 0x07) == OBJECT_TYPE_SCALE)
 378 {
 379 WriteLog(" (SCALED BITMAP)");
 380 uint64 p1 = op_load_phrase(op_pointer), p2 = op_load_phrase(op_pointer+8);
 381 WriteLog("\n%08X --> phrase %08X %08X ", op_pointer, (int)(p1>>32), (int)(p1&0xFFFFFFFF));
 382 WriteLog("\n%08X --> phrase %08X %08X ", op_pointer+8, (int)(p2>>32), (int)(p2&0xFFFFFFFF));
 383         uint8 bitdepth = (p1 >> 12) & 0x07;
 384 //WAS:  int16 ypos = ((p0 >> 3) & 0x3FF);                       // ??? What if not interlaced (/2)?
 385         int16 ypos = ((p0 >> 3) & 0x7FF);                       // ??? What if not interlaced (/2)?
 386 int32 xpos = p1 & 0xFFF;
 387 xpos = (xpos & 0x800 ? xpos | 0xFFFFF000 : xpos);
 388         uint32 iwidth = ((p1 >> 28) & 0x3FF);
 389         uint32 dwidth = ((p1 >> 18) & 0x3FF);           // Unsigned!
 390         uint16 height = ((p0 >> 14) & 0x3FF);
 391         uint32 link = ((p0 >> 24) & 0x7FFFF) << 3;
 392         uint32 ptr = ((p0 >> 43) & 0x1FFFFF) << 3;
 393         uint32 firstPix = (p1 >> 49) & 0x3F;
 394         uint8 flags = (p1 >> 45) & 0x0F;
 395         uint8 idx = (p1 >> 38) & 0x7F;
 396         uint32 pitch = (p1 >> 15) & 0x07;
 397 WriteLog("\n    [%u (%u) x %u @ (%i, %u) (%u bpp), l: %08X, p: %08X fp: %02X, fl:%s%s%s%s, idx:%02X, pt:%02X]\n",
 398         iwidth, dwidth, height, xpos, ypos, op_bitmap_bit_depth[bitdepth], link, ptr, firstPix, (flags&OPFLAG_REFLECT ? "REFLECT " : ""), (flags&OPFLAG_RMW ? "RMW " : ""), (flags&OPFLAG_TRANS ? "TRANS " : ""), (flags&OPFLAG_RELEASE ? "RELEASE" : ""), idx, pitch);
 399         uint32 hscale = p2 & 0xFF;
 400         uint32 vscale = (p2 >> 8) & 0xFF;
 401         uint32 remainder = (p2 >> 16) & 0xFF;
 402 WriteLog("    [hsc: %02X, vsc: %02X, rem: %02X]\n", hscale, vscale, remainder);
 403 }
 404 if ((p0 & 0x07) == OBJECT_TYPE_GPU)
 405 WriteLog(" (GPU)\n");
 406 if ((p0 & 0x07) == OBJECT_TYPE_BRANCH)
 407 {
 408 WriteLog(" (BRANCH)\n");
 409 uint8 * jaguar_mainRam = GetRamPtr();
 410 WriteLog("[RAM] --> ");
 411 for(int k=0; k<8; k++)
 412         WriteLog("%02X ", jaguar_mainRam[op_pointer-8 + k]);
 413 WriteLog("\n");
 414 }
 415 if ((p0 & 0x07) == OBJECT_TYPE_STOP)
 416 WriteLog("    --> List end\n");
 417 }//*/
 418
 419                 switch ((uint8)p0 & 0x07)
 420                 {
 421                 case OBJECT_TYPE_BITMAP:
 422                 {
 423 //WAS:                  uint16 ypos = (p0 >> 3) & 0x3FF;
 424                         uint16 ypos = (p0 >> 3) & 0x7FF;
 425 // This is only theory implied by Rayman...!
 426 // It seems that if the YPOS is zero, then bump the YPOS value so that it coincides with
 427 // the VDB value. With interlacing, this would be slightly more tricky.
 428 // There's probably another bit somewhere that enables this mode--but so far, doesn't seem
 429 // to affect any other game in a negative way (that I've seen).
 430 // Either that, or it's an undocumented bug...
 431
 432 //No, the reason this was needed is that the OP code before was wrong. Any value
 433 //less than VDB will get written to the top line of the display!
 434 //                      if (ypos == 0)
 435 //                              ypos = TOMReadWord(0xF00046, OP) / 2;                   // Get the VDB value
 436                         uint32 height = (p0 & 0xFFC000) >> 14;
 437                         uint32 oldOPP = op_pointer - 8;
 438 // *** BEGIN OP PROCESSOR TESTING ONLY ***
 439 if (inhibit && op_start_log)
 440         WriteLog("!!! ^^^ This object is INHIBITED! ^^^ !!!\n");
 441 bitmapCounter++;
 442 if (!inhibit)   // For OP testing only!
 443 // *** END OP PROCESSOR TESTING ONLY ***
 444                         if (scanline >= ypos && height > 0)
 445                         {
 446                                 uint64 p1 = op_load_phrase(op_pointer);
 447                                 op_pointer += 8;
 448 //WriteLog("OP: Writing scanline %d with ypos == %d...\n", scanline, ypos);
 449 //WriteLog("--> Writing %u BPP bitmap...\n", op_bitmap_bit_depth[(p1 >> 12) & 0x07]);
 450 //                              OPProcessFixedBitmap(scanline, p0, p1, render);
 451                                 OPProcessFixedBitmap(p0, p1, render);
 452
 453                                 // OP write-backs
 454
 455 //???Does this really happen??? Doesn't seem to work if you do this...!
 456 //Probably not. Must be a bug in the documentation...!
 457 //                              uint32 link = (p0 & 0x7FFFF000000) >> 21;
 458 //                              SET16(objectp_ram, 0x20, link & 0xFFFF);        // OLP
 459 //                              SET16(objectp_ram, 0x22, link >> 16);
 460 /*                              uint32 height = (p0 & 0xFFC000) >> 14;
 461                                 if (height - 1 > 0)
 462                                         height--;*/
 463                                 // NOTE: Would subtract 2 if in interlaced mode...!
 464 //                              uint64 height = ((p0 & 0xFFC000) - 0x4000) & 0xFFC000;
 465 //                              if (height)
 466                                 height--;
 467
 468                                 uint64 data = (p0 & 0xFFFFF80000000000LL) >> 40;
 469                                 uint64 dwidth = (p1 & 0xFFC0000) >> 15;
 470                                 data += dwidth;
 471
 472                                 p0 &= ~0xFFFFF80000FFC000LL;            // Mask out old data...
 473                                 p0 |= (uint64)height << 14;
 474                                 p0 |= data << 40;
 475                                 OPStorePhrase(oldOPP, p0);
 476                         }
 477 //WriteLog("\t\tOld OP: %08X -> ", op_pointer);
 478 //Temp, for testing...
 479 //No doubt, this type of check will break all kinds of stuff... !!! FIX !!!
 480 //And it does! !!! FIX !!!
 481 //Let's remove this "fix" since it screws up more than it fixes.
 482 /*      if (op_pointer > ((p0 & 0x000007FFFF000000LL) >> 21))
 483                 return;*/
 484
 485                         op_pointer = (p0 & 0x000007FFFF000000LL) >> 21;
 486 //WriteLog("New OP: %08X\n", op_pointer);
 487                         break;
 488                 }
 489                 case OBJECT_TYPE_SCALE:
 490                 {
 491 //WAS:                  uint16 ypos = (p0 >> 3) & 0x3FF;
 492                         uint16 ypos = (p0 >> 3) & 0x7FF;
 493                         uint32 height = (p0 & 0xFFC000) >> 14;
 494                         uint32 oldOPP = op_pointer - 8;
 495 // *** BEGIN OP PROCESSOR TESTING ONLY ***
 496 if (inhibit && op_start_log)
 497 {
 498         WriteLog("!!! ^^^ This object is INHIBITED! ^^^ !!! (scanline=%u, ypos=%u, height=%u)\n", scanline, ypos, height);
 499         DumpScaledObject(p0, op_load_phrase(op_pointer), op_load_phrase(op_pointer+8));
 500 }
 501 bitmapCounter++;
 502 if (!inhibit)   // For OP testing only!
 503 // *** END OP PROCESSOR TESTING ONLY ***
 504                         if (scanline >= ypos && height > 0)
 505                         {
 506                                 uint64 p1 = op_load_phrase(op_pointer);
 507                                 op_pointer += 8;
 508                                 uint64 p2 = op_load_phrase(op_pointer);
 509                                 op_pointer += 8;
 510 //WriteLog("OP: %08X (%d) %08X%08X %08X%08X %08X%08X\n", oldOPP, scanline, (uint32)(p0>>32), (uint32)(p0&0xFFFFFFFF), (uint32)(p1>>32), (uint32)(p1&0xFFFFFFFF), (uint32)(p2>>32), (uint32)(p2&0xFFFFFFFF));
 511                                 OPProcessScaledBitmap(p0, p1, p2, render);
 512
 513                                 // OP write-backs
 514
 515                                 uint8 remainder = p2 >> 16, vscale = p2 >> 8;
 516 //Actually, we should skip this object if it has a vscale of zero.
 517 //Or do we? Not sure... Atari Karts has a few lines that look like:
 518 // (SCALED BITMAP)
 519 //000E8268 --> phrase 00010000 7000B00D
 520 //    [7 (0) x 1 @ (13, 0) (8 bpp), l: 000E82A0, p: 000E0FC0 fp: 00, fl:RELEASE, idx:00, pt:01]
 521 //    [hsc: 9A, vsc: 00, rem: 00]
 522 // Could it be the vscale is overridden if the DWIDTH is zero? Hmm...
 523
 524                                 if (vscale == 0)
 525                                         vscale = 0x20;                                  // OP bug??? Nope, it isn't...! Or is it?
 526
 527 //extern int start_logging;
 528 //if (start_logging)
 529 //      WriteLog("--> Returned from scaled bitmap processing (rem=%02X, vscale=%02X)...\n", remainder, vscale);//*/
 530 //Locks up here:
 531 //--> Returned from scaled bitmap processing (rem=20, vscale=80)...
 532 //There are other problems here, it looks like...
 533 //Another lock up:
 534 //About to execute OP (508)...
 535 /*
 536 OP: Scaled bitmap 4x? 4bpp at 38,? hscale=7C fpix=0 data=00075E28 pitch 1 hflipped=no dwidth=? (linked to 00071118) Transluency=no
 537 --> Returned from scaled bitmap processing (rem=50, vscale=7C)...
 538 OP: Scaled bitmap 4x? 4bpp at 38,? hscale=7C fpix=0 data=00075E28 pitch 1 hflipped=no dwidth=? (linked to 00071118) Transluency=no
 539 --> Returned from scaled bitmap processing (rem=30, vscale=7C)...
 540 OP: Scaled bitmap 4x? 4bpp at 38,? hscale=7C fpix=0 data=00075E28 pitch 1 hflipped=no dwidth=? (linked to 00071118) Transluency=no
 541 --> Returned from scaled bitmap processing (rem=10, vscale=7C)...
 542 OP: Scaled bitmap 4x? 4bpp at 36,? hscale=7E fpix=0 data=000756A8 pitch 1 hflipped=no dwidth=? (linked to 00073058) Transluency=no
 543 --> Returned from scaled bitmap processing (rem=00, vscale=7E)...
 544 OP: Scaled bitmap 4x? 4bpp at 34,? hscale=80 fpix=0 data=000756C8 pitch 1 hflipped=no dwidth=? (linked to 00073078) Transluency=no
 545 --> Returned from scaled bitmap processing (rem=00, vscale=80)...
 546 OP: Scaled bitmap 4x? 4bpp at 36,? hscale=7E fpix=0 data=000756C8 pitch 1 hflipped=no dwidth=? (linked to 00073058) Transluency=no
 547 --> Returned from scaled bitmap processing (rem=5E, vscale=7E)...
 548 OP: Scaled bitmap 4x? 4bpp at 34,? hscale=80 fpix=0 data=000756E8 pitch 1 hflipped=no dwidth=? (linked to 00073078) Transluency=no
 549 --> Returned from scaled bitmap processing (rem=60, vscale=80)...
 550 OP: Scaled bitmap 4x? 4bpp at 36,? hscale=7E fpix=0 data=000756C8 pitch 1 hflipped=no dwidth=? (linked to 00073058) Transluency=no
 551 --> Returned from scaled bitmap processing (rem=3E, vscale=7E)...
 552 OP: Scaled bitmap 4x? 4bpp at 34,? hscale=80 fpix=0 data=000756E8 pitch 1 hflipped=no dwidth=? (linked to 00073078) Transluency=no
 553 --> Returned from scaled bitmap processing (rem=40, vscale=80)...
 554 OP: Scaled bitmap 4x? 4bpp at 36,? hscale=7E fpix=0 data=000756C8 pitch 1 hflipped=no dwidth=? (linked to 00073058) Transluency=no
 555 --> Returned from scaled bitmap processing (rem=1E, vscale=7E)...
 556 OP: Scaled bitmap 4x? 4bpp at 34,? hscale=80 fpix=0 data=000756E8 pitch 1 hflipped=no dwidth=? (linked to 00073078) Transluency=no
 557 --> Returned from scaled bitmap processing (rem=20, vscale=80)...
 558 */
 559 //Here's another problem:
 560 //    [hsc: 20, vsc: 20, rem: 00]
 561 // Since we're not checking for $E0 (but that's what we get from the above), we end
 562 // up repeating this scanline unnecessarily... !!! FIX !!! [DONE, but... still not quite
 563 // right. Either that, or the Accolade team that wrote Bubsy screwed up royal.]
 564 //Also note: $E0 = 7.0 which IS a legal vscale value...
 565
 566 //                              if (remainder & 0x80)                           // I.e., it's negative
 567 //                              if ((remainder & 0x80) || remainder == 0)       // I.e., it's <= 0
 568 //                              if ((remainder - 1) >= 0xE0)            // I.e., it's <= 0
 569 //                              if ((remainder >= 0xE1) || remainder == 0)// I.e., it's <= 0
 570 //                              if ((remainder >= 0xE1 && remainder <= 0xFF) || remainder == 0)// I.e., it's <= 0
 571                                 if (remainder <= 0x20)                          // I.e., it's <= 0
 572                                 {
 573                                         uint64 data = (p0 & 0xFFFFF80000000000LL) >> 40;
 574                                         uint64 dwidth = (p1 & 0xFFC0000) >> 15;
 575
 576 //                                      while (remainder & 0x80)
 577 //                                      while ((remainder & 0x80) || remainder == 0)
 578 //                                      while ((remainder - 1) >= 0xE0)
 579 //                                      while ((remainder >= 0xE1) || remainder == 0)
 580 //                                      while ((remainder >= 0xE1 && remainder <= 0xFF) || remainder == 0)
 581                                         while (remainder <= 0x20)
 582                                         {
 583                                                 remainder += vscale;
 584
 585                                                 if (height)
 586                                                         height--;
 587
 588                                                 data += dwidth;
 589                                         }
 590
 591                                         p0 &= ~0xFFFFF80000FFC000LL;    // Mask out old data...
 592                                         p0 |= (uint64)height << 14;
 593                                         p0 |= data << 40;
 594                                         OPStorePhrase(oldOPP, p0);
 595                                 }
 596
 597                                 remainder -= 0x20;                                      // 1.0f in [3.5] fixed point format
 598
 599 //if (start_logging)
 600 //      WriteLog("--> Finished writebacks...\n");//*/
 601
 602 //WriteLog(" [%08X%08X -> ", (uint32)(p2>>32), (uint32)(p2&0xFFFFFFFF));
 603                                 p2 &= ~0x0000000000FF0000LL;
 604                                 p2 |= (uint64)remainder << 16;
 605 //WriteLog("%08X%08X]\n", (uint32)(p2>>32), (uint32)(p2&0xFFFFFFFF));
 606                                 OPStorePhrase(oldOPP+16, p2);
 607 //remainder = (uint8)(p2 >> 16), vscale = (uint8)(p2 >> 8);
 608 //WriteLog(" [after]: rem=%02X, vscale=%02X\n", remainder, vscale);
 609                         }
 610                         op_pointer = (p0 & 0x000007FFFF000000LL) >> 21;
 611                         break;
 612                 }
 613                 case OBJECT_TYPE_GPU:
 614                 {
 615 //WriteLog("OP: Asserting GPU IRQ #3...\n");
 616                         op_set_current_object(p0);
 617                         GPUSetIRQLine(3, ASSERT_LINE);
 618 //Also, OP processing is suspended from this point until OBF (F00026) is written to...
 619 // !!! FIX !!!
 620 //Do something like:
 621 //OPSuspendedByGPU = true;
 622 //Dunno if the OP keeps processing from where it was interrupted, or if it just continues
 623 //on the next scanline...
 624 // --> It continues from where it was interrupted! !!! FIX !!!
 625                         break;
 626                 }
 627                 case OBJECT_TYPE_BRANCH:
 628                 {
 629                         uint16 ypos = (p0 >> 3) & 0x7FF;
 630                         uint8  cc   = (p0 >> 14) & 0x03;
 631                         uint32 link = (p0 >> 21) & 0x3FFFF8;
 632
 633 //                      if ((ypos!=507)&&(ypos!=25))
 634 //                              WriteLog("\t%i%s%i link=0x%.8x\n",scanline,condition_to_str[cc],ypos>>1,link);
 635                         switch (cc)
 636                         {
 637                         case CONDITION_EQUAL:
 638                                 if (TOMReadWord(0xF00006, OP) == ypos || ypos == 0x7FF)
 639                                         op_pointer = link;
 640                                 break;
 641                         case CONDITION_LESS_THAN:
 642                                 if (TOMReadWord(0xF00006, OP) < ypos)
 643                                         op_pointer = link;
 644                                 break;
 645                         case CONDITION_GREATER_THAN:
 646                                 if (TOMReadWord(0xF00006, OP) > ypos)
 647                                         op_pointer = link;
 648                                 break;
 649                         case CONDITION_OP_FLAG_SET:
 650                                 if (op_get_status_register() & 0x01)
 651                                         op_pointer = link;
 652                                 break;
 653                         case CONDITION_SECOND_HALF_LINE:
 654                                 // This basically means branch if bit 10 of HC is set
 655                                 WriteLog("OP: Unexpected CONDITION_SECOND_HALF_LINE in BRANCH object\nOP: shuting down\n");
 656                                 fclose(log_get());
 657                                 exit(0);
 658                                 break;
 659                         default:
 660                                 WriteLog("OP: Unimplemented branch condition %i\n", cc);
 661                         }
 662                         break;
 663                 }
 664                 case OBJECT_TYPE_STOP:
 665                 {
 666 //op_start_log = 0;
 667                         // unsure
 668 //WriteLog("OP: --> STOP\n");
 669 //                      op_set_status_register(((p0>>3) & 0xFFFFFFFF));
 670 //This seems more likely...
 671                         op_set_current_object(p0);
 672
 673                         if (p0 & 0x08)
 674                         {
 675                                 tom_set_pending_object_int();
 676                                 if (tom_irq_enabled(IRQ_OPFLAG))// && jaguar_interrupt_handler_is_valid(64))
 677                                         m68k_set_irq(7);                                // Cause an NMI to occur...
 678                         }
 679
 680                         return;
 681 //                      break;
 682                 }
 683                 default:
 684                         WriteLog("op: unknown object type %i\n", ((uint8)p0 & 0x07));
 685                         return;
 686                 }
 687
 688                 // Here is a little sanity check to keep the OP from locking up the machine
 689                 // when fed bad data. Better would be to count how many actual cycles it used
 690                 // and bail out/reenter to properly simulate an overloaded OP... !!! FIX !!!
 691                 opCyclesToRun--;
 692                 if (!opCyclesToRun)
 693                         return;
 694         }
 695 }
 696
 697 //
 698 // Store fixed size bitmap in line buffer
 699 //
 700 void OPProcessFixedBitmap(uint64 p0, uint64 p1, bool render)
 701 {
 702 // Need to make sure that when writing that it stays within the line buffer...
 703 // LBUF ($F01800 - $F01D9E) 360 x 32-bit RAM
 704         uint8 depth = (p1 >> 12) & 0x07;                                // Color depth of image
 705         int32 xpos = ((int16)((p1 << 4) & 0xFFFF)) >> 4;// Image xpos in LBUF
 706         uint32 iwidth = (p1 >> 28) & 0x3FF;                             // Image width in *phrases*
 707         uint32 data = (p0 >> 40) & 0xFFFFF8;                    // Pixel data address
 708 //#ifdef OP_DEBUG_BMP
 709         uint32  firstPix = (p1 >> 49) & 0x3F;
 710         // "The LSB is significant only for scaled objects..." -JTRM
 711         // "In 1 BPP mode, all five bits are significant. In 2 BPP mode, the top four are significant..."
 712         firstPix &= 0x3E;
 713 //#endif
 714 // We can ignore the RELEASE (high order) bit for now--probably forever...!
 715 //      uint8 flags = (p1 >> 45) & 0x0F;        // REFLECT, RMW, TRANS, RELEASE
 716 //Optimize: break these out to their own BOOL values
 717         uint8 flags = (p1 >> 45) & 0x07;                                // REFLECT (0), RMW (1), TRANS (2)
 718         bool flagREFLECT = (flags & OPFLAG_REFLECT ? true : false),
 719                 flagRMW = (flags & OPFLAG_RMW ? true : false),
 720                 flagTRANS = (flags & OPFLAG_TRANS ? true : false);
 721 // "For images with 1 to 4 bits/pixel the top 7 to 4 bits of the index
 722 //  provide the most significant bits of the palette address."
 723         uint8 index = (p1 >> 37) & 0xFE;                                // CLUT index offset (upper pix, 1-4 bpp)
 724         uint32 pitch = (p1 >> 15) & 0x07;                               // Phrase pitch
 725         pitch <<= 3;                                                                    // Optimization: Multiply pitch by 8
 726
 727 //      int16 scanlineWidth = tom_getVideoModeWidth();
 728         uint8 * tom_ram_8 = tom_get_ram_pointer();
 729         uint8 * paletteRAM = &tom_ram_8[0x400];
 730         // This is OK as long as it's used correctly: For 16-bit RAM to RAM direct copies--NOT
 731         // for use when using endian-corrected data (i.e., any of the *_word_read functions!)
 732         uint16 * paletteRAM16 = (uint16 *)paletteRAM;
 733
 734 //      WriteLog("bitmap %ix? %ibpp at %i,? firstpix=? data=0x%.8x pitch %i hflipped=%s dwidth=? (linked to ?) RMW=%s Tranparent=%s\n",
 735 //              iwidth, op_bitmap_bit_depth[bitdepth], xpos, ptr, pitch, (flags&OPFLAG_REFLECT ? "yes" : "no"), (flags&OPFLAG_RMW ? "yes" : "no"), (flags&OPFLAG_TRANS ? "yes" : "no"));
 736
 737 // Is it OK to have a 0 for the data width??? (i.e., undocumented?)
 738 // Seems to be... Seems that dwidth *can* be zero (i.e., reuse same line) as well.
 739 // Pitch == 0 is OK too...
 740 //      if (!render || op_pointer == 0 || ptr == 0 || pitch == 0)
 741 //I'm not convinced that we need to concern ourselves with data & op_pointer here either!
 742         if (!render || iwidth == 0)
 743                 return;
 744
 745 //#define OP_DEBUG_BMP
 746 //#ifdef OP_DEBUG_BMP
 747 //      WriteLog("bitmap %ix%i %ibpp at %i,%i firstpix=%i data=0x%.8x pitch %i hflipped=%s dwidth=%i (linked to 0x%.8x) Transluency=%s\n",
 748 //              iwidth, height, op_bitmap_bit_depth[bitdepth], xpos, ypos, firstPix, ptr, pitch, (flags&OPFLAG_REFLECT ? "yes" : "no"), dwidth, op_pointer, (flags&OPFLAG_RMW ? "yes" : "no"));
 749 //#endif
 750
 751 //      int32 leftMargin = xpos, rightMargin = (xpos + (phraseWidthToPixels[depth] * iwidth)) - 1;
 752         int32 startPos = xpos, endPos = xpos +
 753                 (!flagREFLECT ? (phraseWidthToPixels[depth] * iwidth) - 1
 754                 : -((phraseWidthToPixels[depth] * iwidth) + 1));
 755         uint32 clippedWidth = 0, phraseClippedWidth = 0, dataClippedWidth = 0;//, phrasePixel = 0;
 756         bool in24BPPMode = (((GET16(tom_ram_8, 0x0028) >> 1) & 0x03) == 1 ? true : false);      // VMODE
 757         // Not sure if this is Jaguar Two only location or what...
 758         // From the docs, it is... If we want to limit here we should think of something else.
 759 //      int32 limit = GET16(tom_ram_8, 0x0008);                 // LIMIT
 760         int32 limit = 720;
 761         int32 lbufWidth = (!in24BPPMode ? limit - 1 : (limit / 2) - 1); // Zero based limit...
 762
 763         // If the image is completely to the left or right of the line buffer, then bail.
 764 //If in REFLECT mode, then these values are swapped! !!! FIX !!! [DONE]
 765 //There are four possibilities:
 766 //  1. image sits on left edge and no REFLECT; starts out of bounds but ends in bounds.
 767 //  2. image sits on left edge and REFLECT; starts in bounds but ends out of bounds.
 768 //  3. image sits on right edge and REFLECT; starts out of bounds but ends in bounds.
 769 //  4. image sits on right edge and no REFLECT; starts in bounds but ends out of bounds.
 770 //Numbers 2 & 4 can be caught by checking the LBUF clip while in the inner loop,
 771 // numbers 1 & 3 are of concern.
 772 // This *indirectly* handles only cases 2 & 4! And is WRONG is REFLECT is set...!
 773 //      if (rightMargin < 0 || leftMargin > lbufWidth)
 774
 775 // It might be easier to swap these (if REFLECTed) and just use XPOS down below...
 776 // That way, you could simply set XPOS to leftMargin if !REFLECT and to rightMargin otherwise.
 777 // Still have to be careful with the DATA and IWIDTH values though...
 778
 779 //      if ((!flagREFLECT && (rightMargin < 0 || leftMargin > lbufWidth))
 780 //              || (flagREFLECT && (leftMargin < 0 || rightMargin > lbufWidth)))
 781 //              return;
 782         if ((!flagREFLECT && (endPos < 0 || startPos > lbufWidth))
 783                 || (flagREFLECT && (startPos < 0 || endPos > lbufWidth)))
 784                 return;
 785
 786         // Otherwise, find the clip limits and clip the phrase as well...
 787         // NOTE: I'm fudging here by letting the actual blit overstep the bounds of the
 788         //       line buffer, but it shouldn't matter since there are two unused line
 789         //       buffers below and nothing above and I'll at most write 8 bytes outside
 790         //       the line buffer... I could use a fractional clip begin/end value, but
 791         //       this makes the blit a *lot* more hairy. I might fix this in the future
 792         //       if it becomes necessary. (JLH)
 793         //       Probably wouldn't be *that* hairy. Just use a delta that tells the inner loop
 794         //       which pixel in the phrase is being written, and quit when either end of phrases
 795         //       is reached or line buffer extents are surpassed.
 796
 797 //This stuff is probably wrong as well... !!! FIX !!!
 798 //The strange thing is that it seems to work, but that's no guarantee that it's bulletproof!
 799 //Yup. Seems that JagMania doesn't work correctly with this...
 800 //Dunno if this is the problem, but Atari Karts is showing *some* of the road now...
 801 //      if (!flagREFLECT)
 802
 803 /*
 804         if (leftMargin < 0)
 805                 clippedWidth = 0 - leftMargin,
 806                 phraseClippedWidth = clippedWidth / phraseWidthToPixels[depth],
 807                 leftMargin = 0 - (clippedWidth % phraseWidthToPixels[depth]);
 808 //              leftMargin = 0;
 809
 810         if (rightMargin > lbufWidth)
 811                 clippedWidth = rightMargin - lbufWidth,
 812                 phraseClippedWidth = clippedWidth / phraseWidthToPixels[depth];//,
 813 //              rightMargin = lbufWidth + (clippedWidth % phraseWidthToPixels[depth]);
 814 //              rightMargin = lbufWidth;
 815 */
 816 if (depth > 5)
 817         WriteLog("OP: We're about to encounter a divide by zero error!\n");
 818         // NOTE: We're just using endPos to figure out how much, if any, to clip by.
 819         // ALSO: There may be another case where we start out of bounds and end out of bounds...!
 820         // !!! FIX !!!
 821         if (startPos < 0)                       // Case #1: Begin out, end in, L to R
 822                 clippedWidth = 0 - startPos,
 823                 dataClippedWidth = phraseClippedWidth = clippedWidth / phraseWidthToPixels[depth],
 824                 startPos = 0 - (clippedWidth % phraseWidthToPixels[depth]);
 825
 826         if (endPos < 0)                         // Case #2: Begin in, end out, R to L
 827                 clippedWidth = 0 - endPos,
 828                 phraseClippedWidth = clippedWidth / phraseWidthToPixels[depth];
 829
 830         if (endPos > lbufWidth)         // Case #3: Begin in, end out, L to R
 831                 clippedWidth = endPos - lbufWidth,
 832                 phraseClippedWidth = clippedWidth / phraseWidthToPixels[depth];
 833
 834         if (startPos > lbufWidth)       // Case #4: Begin out, end in, R to L
 835                 clippedWidth = startPos - lbufWidth,
 836                 dataClippedWidth = phraseClippedWidth = clippedWidth / phraseWidthToPixels[depth],
 837                 startPos = lbufWidth + (clippedWidth % phraseWidthToPixels[depth]);
 838
 839         // If the image is sitting on the line buffer left or right edge, we need to compensate
 840         // by decreasing the image phrase width accordingly.
 841         iwidth -= phraseClippedWidth;
 842
 843         // Also, if we're clipping the phrase we need to make sure we're in the correct part of
 844         // the pixel data.
 845 //      data += phraseClippedWidth * (pitch << 3);
 846         data += dataClippedWidth * pitch;
 847
 848         // NOTE: When the bitmap is in REFLECT mode, the XPOS marks the *right* side of the
 849         //       bitmap! This makes clipping & etc. MUCH, much easier...!
 850 //      uint32 lbufAddress = 0x1800 + (!in24BPPMode ? leftMargin * 2 : leftMargin * 4);
 851 //Why does this work right when multiplying startPos by 2 (instead of 4) for 24 BPP mode?
 852 //Is this a bug in the OP?
 853         uint32 lbufAddress = 0x1800 + (!in24BPPMode ? startPos * 2 : startPos * 2);
 854         uint8 * currentLineBuffer = &tom_ram_8[lbufAddress];
 855
 856         // Render.
 857
 858 // Hmm. We check above for 24 BPP mode, but don't do anything about it below...
 859 // If we *were* in 24 BPP mode, how would you convert CRY to RGB24? Seems to me
 860 // that if you're in CRY mode then you wouldn't be able to use 24 BPP bitmaps
 861 // anyway.
 862 // This seems to be the case (at least according to the Midsummer docs)...!
 863
 864         if (depth == 0)                                                                 // 1 BPP
 865         {
 866                 // The LSB of flags is OPFLAG_REFLECT, so sign extend it and or 2 into it.
 867                 int32 lbufDelta = ((int8)((flags << 7) & 0xFF) >> 5) | 0x02;
 868
 869                 // Fetch 1st phrase...
 870                 uint64 pixels = ((uint64)JaguarReadLong(data, OP) << 32) | JaguarReadLong(data + 4, OP);
 871 //Note that firstPix should only be honored *if* we start with the 1st phrase of the bitmap
 872 //i.e., we didn't clip on the margin... !!! FIX !!!
 873                 pixels <<= firstPix;                                            // Skip first N pixels (N=firstPix)...
 874                 int i = firstPix;                                                       // Start counter at right spot...
 875
 876                 while (iwidth--)
 877                 {
 878                         while (i++ < 64)
 879                         {
 880                                 uint8 bit = pixels >> 63;
 881                                 if (flagTRANS && bit == 0)
 882                                         ;       // Do nothing...
 883                                 else
 884                                 {
 885                                         if (!flagRMW)
 886 //Optimize: Set palleteRAM16 to beginning of palette RAM + index*2 and use only [bit] as index...
 887 //Won't optimize RMW case though...
 888                                                 // This is the *only* correct use of endian-dependent code
 889                                                 // (i.e., mem-to-mem direct copying)!
 890                                                 *(uint16 *)currentLineBuffer = paletteRAM16[index | bit];
 891                                         else
 892                                                 *currentLineBuffer =
 893                                                         BLEND_CR(*currentLineBuffer, paletteRAM[(index | bit) << 1]),
 894                                                 *(currentLineBuffer + 1) =
 895                                                         BLEND_Y(*(currentLineBuffer + 1), paletteRAM[((index | bit) << 1) + 1]);
 896                                 }
 897
 898                                 currentLineBuffer += lbufDelta;
 899                                 pixels <<= 1;
 900                         }
 901                         i = 0;
 902                         // Fetch next phrase...
 903                         data += pitch;
 904                         pixels = ((uint64)JaguarReadLong(data, OP) << 32) | JaguarReadLong(data + 4, OP);
 905                 }
 906         }
 907         else if (depth == 1)                                                    // 2 BPP
 908         {
 909 if (firstPix)
 910         WriteLog("OP: Fixed bitmap @ 2 BPP requesting FIRSTPIX! (fp=%u)\n", firstPix);
 911                 index &= 0xFC;                                                          // Top six bits form CLUT index
 912                 // The LSB is OPFLAG_REFLECT, so sign extend it and or 2 into it.
 913                 int32 lbufDelta = ((int8)((flags << 7) & 0xFF) >> 5) | 0x02;
 914
 915                 while (iwidth--)
 916                 {
 917                         // Fetch phrase...
 918                         uint64 pixels = ((uint64)JaguarReadLong(data, OP) << 32) | JaguarReadLong(data + 4, OP);
 919                         data += pitch;
 920
 921                         for(int i=0; i<32; i++)
 922                         {
 923                                 uint8 bits = pixels >> 62;
 924 // Seems to me that both of these are in the same endian, so we could cast it as
 925 // uint16 * and do straight across copies (what about 24 bpp? Treat it differently...)
 926 // This only works for the palettized modes (1 - 8 BPP), since we actually have to
 927 // copy data from memory in 16 BPP mode (or does it? Isn't this the same as the CLUT case?)
 928 // No, it isn't because we read the memory in an endian safe way--this *won't* work...
 929                                 if (flagTRANS && bits == 0)
 930                                         ;       // Do nothing...
 931                                 else
 932                                 {
 933                                         if (!flagRMW)
 934                                                 *(uint16 *)currentLineBuffer = paletteRAM16[index | bits];
 935                                         else
 936                                                 *currentLineBuffer =
 937                                                         BLEND_CR(*currentLineBuffer, paletteRAM[(index | bits) << 1]),
 938                                                 *(currentLineBuffer + 1) =
 939                                                         BLEND_Y(*(currentLineBuffer + 1), paletteRAM[((index | bits) << 1) + 1]);
 940                                 }
 941
 942                                 currentLineBuffer += lbufDelta;
 943                                 pixels <<= 2;
 944                         }
 945                 }
 946         }
 947         else if (depth == 2)                                                    // 4 BPP
 948         {
 949 if (firstPix)
 950         WriteLog("OP: Fixed bitmap @ 4 BPP requesting FIRSTPIX! (fp=%u)\n", firstPix);
 951                 index &= 0xF0;                                                          // Top four bits form CLUT index
 952                 // The LSB is OPFLAG_REFLECT, so sign extend it and or 2 into it.
 953                 int32 lbufDelta = ((int8)((flags << 7) & 0xFF) >> 5) | 0x02;
 954
 955                 while (iwidth--)
 956                 {
 957                         // Fetch phrase...
 958                         uint64 pixels = ((uint64)JaguarReadLong(data, OP) << 32) | JaguarReadLong(data + 4, OP);
 959                         data += pitch;
 960
 961                         for(int i=0; i<16; i++)
 962                         {
 963                                 uint8 bits = pixels >> 60;
 964 // Seems to me that both of these are in the same endian, so we could cast it as
 965 // uint16 * and do straight across copies (what about 24 bpp? Treat it differently...)
 966 // This only works for the palettized modes (1 - 8 BPP), since we actually have to
 967 // copy data from memory in 16 BPP mode (or does it? Isn't this the same as the CLUT case?)
 968 // No, it isn't because we read the memory in an endian safe way--this *won't* work...
 969                                 if (flagTRANS && bits == 0)
 970                                         ;       // Do nothing...
 971                                 else
 972                                 {
 973                                         if (!flagRMW)
 974                                                 *(uint16 *)currentLineBuffer = paletteRAM16[index | bits];
 975                                         else
 976                                                 *currentLineBuffer =
 977                                                         BLEND_CR(*currentLineBuffer, paletteRAM[(index | bits) << 1]),
 978                                                 *(currentLineBuffer + 1) =
 979                                                         BLEND_Y(*(currentLineBuffer + 1), paletteRAM[((index | bits) << 1) + 1]);
 980                                 }
 981
 982                                 currentLineBuffer += lbufDelta;
 983                                 pixels <<= 4;
 984                         }
 985                 }
 986         }
 987         else if (depth == 3)                                                    // 8 BPP
 988         {
 989                 // The LSB is OPFLAG_REFLECT, so sign extend it and or 2 into it.
 990                 int32 lbufDelta = ((int8)((flags << 7) & 0xFF) >> 5) | 0x02;
 991
 992                 // Fetch 1st phrase...
 993                 uint64 pixels = ((uint64)JaguarReadLong(data, OP) << 32) | JaguarReadLong(data + 4, OP);
 994 //Note that firstPix should only be honored *if* we start with the 1st phrase of the bitmap
 995 //i.e., we didn't clip on the margin... !!! FIX !!!
 996                 firstPix &= 0x30;                                                       // Only top two bits are valid for 8 BPP
 997                 pixels <<= firstPix;                                            // Skip first N pixels (N=firstPix)...
 998                 int i = firstPix >> 3;                                          // Start counter at right spot...
 999
1000                 while (iwidth--)
1001                 {
1002                         while (i++ < 8)
1003                         {
1004                                 uint8 bits = pixels >> 56;
1005 // Seems to me that both of these are in the same endian, so we could cast it as
1006 // uint16 * and do straight across copies (what about 24 bpp? Treat it differently...)
1007 // This only works for the palettized modes (1 - 8 BPP), since we actually have to
1008 // copy data from memory in 16 BPP mode (or does it? Isn't this the same as the CLUT case?)
1009 // No, it isn't because we read the memory in an endian safe way--this *won't* work...
1010                                 if (flagTRANS && bits == 0)
1011                                         ;       // Do nothing...
1012                                 else
1013                                 {
1014                                         if (!flagRMW)
1015                                                 *(uint16 *)currentLineBuffer = paletteRAM16[bits];
1016                                         else
1017                                                 *currentLineBuffer =
1018                                                         BLEND_CR(*currentLineBuffer, paletteRAM[bits << 1]),
1019                                                 *(currentLineBuffer + 1) =
1020                                                         BLEND_Y(*(currentLineBuffer + 1), paletteRAM[(bits << 1) + 1]);
1021                                 }
1022
1023                                 currentLineBuffer += lbufDelta;
1024                                 pixels <<= 8;
1025                         }
1026                         i = 0;
1027                         // Fetch next phrase...
1028                         data += pitch;
1029                         pixels = ((uint64)JaguarReadLong(data, OP) << 32) | JaguarReadLong(data + 4, OP);
1030                 }
1031         }
1032         else if (depth == 4)                                                    // 16 BPP
1033         {
1034 if (firstPix)
1035         WriteLog("OP: Fixed bitmap @ 16 BPP requesting FIRSTPIX! (fp=%u)\n", firstPix);
1036                 // The LSB is OPFLAG_REFLECT, so sign extend it and or 2 into it.
1037                 int32 lbufDelta = ((int8)((flags << 7) & 0xFF) >> 5) | 0x02;
1038
1039                 while (iwidth--)
1040                 {
1041                         // Fetch phrase...
1042                         uint64 pixels = ((uint64)JaguarReadLong(data, OP) << 32) | JaguarReadLong(data + 4, OP);
1043                         data += pitch;
1044
1045                         for(int i=0; i<4; i++)
1046                         {
1047                                 uint8 bitsHi = pixels >> 56, bitsLo = pixels >> 48;
1048 // Seems to me that both of these are in the same endian, so we could cast it as
1049 // uint16 * and do straight across copies (what about 24 bpp? Treat it differently...)
1050 // This only works for the palettized modes (1 - 8 BPP), since we actually have to
1051 // copy data from memory in 16 BPP mode (or does it? Isn't this the same as the CLUT case?)
1052 // No, it isn't because we read the memory in an endian safe way--it *won't* work...
1053                                 if (flagTRANS && (bitsLo | bitsHi) == 0)
1054                                         ;       // Do nothing...
1055                                 else
1056                                 {
1057                                         if (!flagRMW)
1058                                                 *currentLineBuffer = bitsHi,
1059                                                 *(currentLineBuffer + 1) = bitsLo;
1060                                         else
1061                                                 *currentLineBuffer =
1062                                                         BLEND_CR(*currentLineBuffer, bitsHi),
1063                                                 *(currentLineBuffer + 1) =
1064                                                         BLEND_Y(*(currentLineBuffer + 1), bitsLo);
1065                                 }
1066
1067                                 currentLineBuffer += lbufDelta;
1068                                 pixels <<= 16;
1069                         }
1070                 }
1071         }
1072         else if (depth == 5)                                                    // 24 BPP
1073         {
1074 //Looks like Iron Soldier is the only game that uses 24BPP mode...
1075 //There *might* be others...
1076 //WriteLog("OP: Writing 24 BPP bitmap!\n");
1077 if (firstPix)
1078         WriteLog("OP: Fixed bitmap @ 24 BPP requesting FIRSTPIX! (fp=%u)\n", firstPix);
1079                 // Not sure, but I think RMW only works with 16 BPP and below, and only in CRY mode...
1080                 // The LSB of flags is OPFLAG_REFLECT, so sign extend it and OR 4 into it.
1081                 int32 lbufDelta = ((int8)((flags << 7) & 0xFF) >> 4) | 0x04;
1082
1083                 while (iwidth--)
1084                 {
1085                         // Fetch phrase...
1086                         uint64 pixels = ((uint64)JaguarReadLong(data, OP) << 32) | JaguarReadLong(data + 4, OP);
1087                         data += pitch;
1088
1089                         for(int i=0; i<2; i++)
1090                         {
1091                                 // We don't use a 32-bit var here because of endian issues...!
1092                                 uint8 bits3 = pixels >> 56, bits2 = pixels >> 48,
1093                                         bits1 = pixels >> 40, bits0 = pixels >> 32;
1094
1095                                 if (flagTRANS && (bits3 | bits2 | bits1 | bits0) == 0)
1096                                         ;       // Do nothing...
1097                                 else
1098                                         *currentLineBuffer = bits3,
1099                                         *(currentLineBuffer + 1) = bits2,
1100                                         *(currentLineBuffer + 2) = bits1,
1101                                         *(currentLineBuffer + 3) = bits0;
1102
1103                                 currentLineBuffer += lbufDelta;
1104                                 pixels <<= 32;
1105                         }
1106                 }
1107         }
1108 }
1109
1110 //
1111 // Store scaled bitmap in line buffer
1112 //
1113 void OPProcessScaledBitmap(uint64 p0, uint64 p1, uint64 p2, bool render)
1114 {
1115 // Need to make sure that when writing that it stays within the line buffer...
1116 // LBUF ($F01800 - $F01D9E) 360 x 32-bit RAM
1117         uint8 depth = (p1 >> 12) & 0x07;                                // Color depth of image
1118         int32 xpos = ((int16)((p1 << 4) & 0xFFFF)) >> 4;// Image xpos in LBUF
1119         uint32 iwidth = (p1 >> 28) & 0x3FF;                             // Image width in *phrases*
1120         uint32 data = (p0 >> 40) & 0xFFFFF8;                    // Pixel data address
1121 //#ifdef OP_DEBUG_BMP
1122 // Prolly should use this... Though not sure exactly how.
1123 //Use the upper bits as an offset into the phrase depending on the BPP. That's how!
1124         uint32 firstPix = (p1 >> 49) & 0x3F;
1125 //This is WEIRD! I'm sure I saw Atari Karts request 8 BPP FIRSTPIX! What happened???
1126 if (firstPix)
1127         WriteLog("OP: FIRSTPIX != 0! (Scaled BM)\n");
1128 //#endif
1129 // We can ignore the RELEASE (high order) bit for now--probably forever...!
1130 //      uint8 flags = (p1 >> 45) & 0x0F;        // REFLECT, RMW, TRANS, RELEASE
1131 //Optimize: break these out to their own BOOL values [DONE]
1132         uint8 flags = (p1 >> 45) & 0x07;                                // REFLECT (0), RMW (1), TRANS (2)
1133         bool flagREFLECT = (flags & OPFLAG_REFLECT ? true : false),
1134                 flagRMW = (flags & OPFLAG_RMW ? true : false),
1135                 flagTRANS = (flags & OPFLAG_TRANS ? true : false);
1136         uint8 index = (p1 >> 37) & 0xFE;                                // CLUT index offset (upper pix, 1-4 bpp)
1137         uint32 pitch = (p1 >> 15) & 0x07;                               // Phrase pitch
1138
1139         uint8 * tom_ram_8 = tom_get_ram_pointer();
1140         uint8 * paletteRAM = &tom_ram_8[0x400];
1141         // This is OK as long as it's used correctly: For 16-bit RAM to RAM direct copies--NOT
1142         // for use when using endian-corrected data (i.e., any of the *ReadWord functions!)
1143         uint16 * paletteRAM16 = (uint16 *)paletteRAM;
1144
1145         uint8 hscale = p2 & 0xFF;
1146 // Hmm. It seems that fixing the horizontal scale necessitated re-fixing this. Not sure why,
1147 // but seems to be consistent with the vertical scaling now (and it may turn out to be wrong!)...
1148         uint8 horizontalRemainder = hscale;                             // Not sure if it starts full, but seems reasonable [It's not!]
1149 //      uint8 horizontalRemainder = 0;                                  // Let's try zero! Seems to work! Yay! [No, it doesn't!]
1150         int32 scaledWidthInPixels = (iwidth * phraseWidthToPixels[depth] * hscale) >> 5;
1151         uint32 scaledPhrasePixels = (phraseWidthToPixels[depth] * hscale) >> 5;
1152
1153 //      WriteLog("bitmap %ix? %ibpp at %i,? firstpix=? data=0x%.8x pitch %i hflipped=%s dwidth=? (linked to ?) RMW=%s Tranparent=%s\n",
1154 //              iwidth, op_bitmap_bit_depth[bitdepth], xpos, ptr, pitch, (flags&OPFLAG_REFLECT ? "yes" : "no"), (flags&OPFLAG_RMW ? "yes" : "no"), (flags&OPFLAG_TRANS ? "yes" : "no"));
1155
1156 // Looks like an hscale of zero means don't draw!
1157         if (!render || iwidth == 0 || hscale == 0)
1158                 return;
1159
1160 /*extern int start_logging;
1161 if (start_logging)
1162         WriteLog("OP: Scaled bitmap %ix? %ibpp at %i,? hscale=%02X fpix=%i data=%08X pitch %i hflipped=%s dwidth=? (linked to %08X) Transluency=%s\n",
1163                 iwidth, op_bitmap_bit_depth[depth], xpos, hscale, firstPix, data, pitch, (flagREFLECT ? "yes" : "no"), op_pointer, (flagRMW ? "yes" : "no"));*/
1164 //#define OP_DEBUG_BMP
1165 //#ifdef OP_DEBUG_BMP
1166 //      WriteLog("OP: Scaled bitmap %ix%i %ibpp at %i,%i firstpix=%i data=0x%.8x pitch %i hflipped=%s dwidth=%i (linked to 0x%.8x) Transluency=%s\n",
1167 //              iwidth, height, op_bitmap_bit_depth[bitdepth], xpos, ypos, firstPix, ptr, pitch, (flags&OPFLAG_REFLECT ? "yes" : "no"), dwidth, op_pointer, (flags&OPFLAG_RMW ? "yes" : "no"));
1168 //#endif
1169
1170         int32 startPos = xpos, endPos = xpos +
1171                 (!flagREFLECT ? scaledWidthInPixels - 1 : -(scaledWidthInPixels + 1));
1172         uint32 clippedWidth = 0, phraseClippedWidth = 0, dataClippedWidth = 0;
1173         bool in24BPPMode = (((GET16(tom_ram_8, 0x0028) >> 1) & 0x03) == 1 ? true : false);      // VMODE
1174         // Not sure if this is Jaguar Two only location or what...
1175         // From the docs, it is... If we want to limit here we should think of something else.
1176 //      int32 limit = GET16(tom_ram_8, 0x0008);                 // LIMIT
1177         int32 limit = 720;
1178         int32 lbufWidth = (!in24BPPMode ? limit - 1 : (limit / 2) - 1); // Zero based limit...
1179
1180         // If the image is completely to the left or right of the line buffer, then bail.
1181 //If in REFLECT mode, then these values are swapped! !!! FIX !!! [DONE]
1182 //There are four possibilities:
1183 //  1. image sits on left edge and no REFLECT; starts out of bounds but ends in bounds.
1184 //  2. image sits on left edge and REFLECT; starts in bounds but ends out of bounds.
1185 //  3. image sits on right edge and REFLECT; starts out of bounds but ends in bounds.
1186 //  4. image sits on right edge and no REFLECT; starts in bounds but ends out of bounds.
1187 //Numbers 2 & 4 can be caught by checking the LBUF clip while in the inner loop,
1188 // numbers 1 & 3 are of concern.
1189 // This *indirectly* handles only cases 2 & 4! And is WRONG if REFLECT is set...!
1190 //      if (rightMargin < 0 || leftMargin > lbufWidth)
1191
1192 // It might be easier to swap these (if REFLECTed) and just use XPOS down below...
1193 // That way, you could simply set XPOS to leftMargin if !REFLECT and to rightMargin otherwise.
1194 // Still have to be careful with the DATA and IWIDTH values though...
1195
1196         if ((!flagREFLECT && (endPos < 0 || startPos > lbufWidth))
1197                 || (flagREFLECT && (startPos < 0 || endPos > lbufWidth)))
1198                 return;
1199
1200         // Otherwise, find the clip limits and clip the phrase as well...
1201         // NOTE: I'm fudging here by letting the actual blit overstep the bounds of the
1202         //       line buffer, but it shouldn't matter since there are two unused line
1203         //       buffers below and nothing above and I'll at most write 40 bytes outside
1204         //       the line buffer... I could use a fractional clip begin/end value, but
1205         //       this makes the blit a *lot* more hairy. I might fix this in the future
1206         //       if it becomes necessary. (JLH)
1207         //       Probably wouldn't be *that* hairy. Just use a delta that tells the inner loop
1208         //       which pixel in the phrase is being written, and quit when either end of phrases
1209         //       is reached or line buffer extents are surpassed.
1210
1211 //This stuff is probably wrong as well... !!! FIX !!!
1212 //The strange thing is that it seems to work, but that's no guarantee that it's bulletproof!
1213 //Yup. Seems that JagMania doesn't work correctly with this...
1214 //Dunno if this is the problem, but Atari Karts is showing *some* of the road now...
1215 //Actually, it is! Or, it was. It doesn't seem to be clipping here, so the problem lies
1216 //elsewhere! Hmm. Putting the scaling code into the 1/2/8 BPP cases seems to draw the ground
1217 // a bit more accurately... Strange!
1218 //It's probably a case of the REFLECT flag being set and the background being written
1219 //from the right side of the screen...
1220 //But no, it isn't... At least if the diagnostics are telling the truth!
1221
1222         // NOTE: We're just using endPos to figure out how much, if any, to clip by.
1223         // ALSO: There may be another case where we start out of bounds and end out of bounds...!
1224         // !!! FIX !!!
1225
1226 //There's a problem here with scaledPhrasePixels in that it can be forced to zero when
1227 //the scaling factor is small. So fix it already! !!! FIX !!!
1228 /*if (scaledPhrasePixels == 0)
1229 {
1230         WriteLog("OP: [Scaled] We're about to encounter a divide by zero error!\n");
1231         DumpScaledObject(p0, p1, p2);
1232 }//*/
1233 //NOTE: I'm almost 100% sure that this is wrong... And it is! :-p
1234
1235 //Try a simple example...
1236 // Let's say we have a 8 BPP scanline with an hscale of $80 (4). Our xpos is -10,
1237 // non-flipped. Pixels in the bitmap are XYZXYZXYZXYZXYZ.
1238 // Scaled up, they would be XXXXYYYYZZZZXXXXYYYYZZZZXXXXYYYYZZZZ...
1239 //
1240 // Normally, we would expect this in the line buffer:
1241 // ZZXXXXYYYYZZZZXXXXYYYYZZZZ...
1242 //
1243 // But instead we're getting:
1244 // XXXXYYYYZZZZXXXXYYYYZZZZ...
1245 //
1246 // or are we??? It would seem so, simply by virtue of the fact that we're NOT starting
1247 // on negative boundary--or are we? Hmm...
1248 // cw = 10, dcw = pcw = 10 / ([8 * 4 = 32] 32) = 0, sp = -10
1249 //
1250 // Let's try a real world example:
1251 //
1252 //OP: Scaled bitmap (70, 8 BPP, spp=28) sp (-400) < 0... [new sp=-8, cw=400, dcw=pcw=14]
1253 //OP: Scaled bitmap (6F, 8 BPP, spp=27) sp (-395) < 0... [new sp=-17, cw=395, dcw=pcw=14]
1254 //
1255 // Really, spp is 27.75 in the second case...
1256 // So... If we do 395 / 27.75, we get 14. Ok so far... If we scale that against the
1257 // start position (14 * 27.75), we get -6.5... NOT -17!
1258
1259 //Now it seems we're working OK, at least for the first case...
1260 uint32 scaledPhrasePixelsUS = phraseWidthToPixels[depth] * hscale;
1261
1262         if (startPos < 0)                       // Case #1: Begin out, end in, L to R
1263 {
1264 extern int start_logging;
1265 if (start_logging)
1266         WriteLog("OP: Scaled bitmap (%02X, %u BPP, spp=%u) start pos (%i) < 0...", hscale, op_bitmap_bit_depth[depth], scaledPhrasePixels, startPos);
1267 //              clippedWidth = 0 - startPos,
1268                 clippedWidth = (0 - startPos) << 5,
1269 //              dataClippedWidth = phraseClippedWidth = clippedWidth / scaledPhrasePixels,
1270                 dataClippedWidth = phraseClippedWidth = (clippedWidth / scaledPhrasePixelsUS) >> 5,
1271 //              startPos = 0 - (clippedWidth % scaledPhrasePixels);
1272                 startPos += (dataClippedWidth * scaledPhrasePixelsUS) >> 5;
1273 if (start_logging)
1274         WriteLog(" [new sp=%i, cw=%i, dcw=pcw=%i]\n", startPos, clippedWidth, dataClippedWidth);
1275 }
1276
1277         if (endPos < 0)                         // Case #2: Begin in, end out, R to L
1278                 clippedWidth = 0 - endPos,
1279                 phraseClippedWidth = clippedWidth / scaledPhrasePixels;
1280
1281         if (endPos > lbufWidth)         // Case #3: Begin in, end out, L to R
1282                 clippedWidth = endPos - lbufWidth,
1283                 phraseClippedWidth = clippedWidth / scaledPhrasePixels;
1284
1285         if (startPos > lbufWidth)       // Case #4: Begin out, end in, R to L
1286                 clippedWidth = startPos - lbufWidth,
1287                 dataClippedWidth = phraseClippedWidth = clippedWidth / scaledPhrasePixels,
1288                 startPos = lbufWidth + (clippedWidth % scaledPhrasePixels);
1289
1290 extern int op_start_log;
1291 if (op_start_log && clippedWidth != 0)
1292         WriteLog("OP: Clipped line. SP=%i, EP=%i, clip=%u, iwidth=%u, hscale=%02X\n", startPos, endPos, clippedWidth, iwidth, hscale);
1293 if (op_start_log && startPos == 13)
1294 {
1295         WriteLog("OP: Scaled line. SP=%i, EP=%i, clip=%u, iwidth=%u, hscale=%02X, depth=%u, firstPix=%u\n", startPos, endPos, clippedWidth, iwidth, hscale, depth, firstPix);
1296         DumpScaledObject(p0, p1, p2);
1297         if (iwidth == 7)
1298         {
1299                 WriteLog("    %08X: ", data);
1300                 for(int i=0; i<7*8; i++)
1301                         WriteLog("%02X ", JaguarReadByte(data+i));
1302                 WriteLog("\n");
1303         }
1304 }
1305         // If the image is sitting on the line buffer left or right edge, we need to compensate
1306         // by decreasing the image phrase width accordingly.
1307         iwidth -= phraseClippedWidth;
1308
1309         // Also, if we're clipping the phrase we need to make sure we're in the correct part of
1310         // the pixel data.
1311 //      data += phraseClippedWidth * (pitch << 3);
1312         data += dataClippedWidth * (pitch << 3);
1313
1314         // NOTE: When the bitmap is in REFLECT mode, the XPOS marks the *right* side of the
1315         //       bitmap! This makes clipping & etc. MUCH, much easier...!
1316 //      uint32 lbufAddress = 0x1800 + (!in24BPPMode ? leftMargin * 2 : leftMargin * 4);
1317 //      uint32 lbufAddress = 0x1800 + (!in24BPPMode ? startPos * 2 : startPos * 4);
1318         uint32 lbufAddress = 0x1800 + startPos * 2;
1319         uint8 * currentLineBuffer = &tom_ram_8[lbufAddress];
1320 //uint8 * lineBufferLowerLimit = &tom_ram_8[0x1800],
1321 //      * lineBufferUpperLimit = &tom_ram_8[0x1800 + 719];
1322
1323         // Render.
1324
1325 // Hmm. We check above for 24 BPP mode, but don't do anything about it below...
1326 // If we *were* in 24 BPP mode, how would you convert CRY to RGB24? Seems to me
1327 // that if you're in CRY mode then you wouldn't be able to use 24 BPP bitmaps
1328 // anyway.
1329 // This seems to be the case (at least according to the Midsummer docs)...!
1330
1331         if (depth == 0)                                                                 // 1 BPP
1332         {
1333 if (firstPix != 0)
1334         WriteLog("OP: Scaled bitmap @ 1 BPP requesting FIRSTPIX!\n");
1335                 // The LSB of flags is OPFLAG_REFLECT, so sign extend it and or 2 into it.
1336                 int32 lbufDelta = ((int8)((flags << 7) & 0xFF) >> 5) | 0x02;
1337
1338                 int pixCount = 0;
1339                 uint64 pixels = ((uint64)JaguarReadLong(data, OP) << 32) | JaguarReadLong(data + 4, OP);
1340
1341                 while ((int32)iwidth > 0)
1342                 {
1343                         uint8 bits = pixels >> 63;
1344
1345                         if (flagTRANS && bits == 0)
1346                                 ;       // Do nothing...
1347                         else
1348                         {
1349                                 if (!flagRMW)
1350                                         // This is the *only* correct use of endian-dependent code
1351                                         // (i.e., mem-to-mem direct copying)!
1352                                         *(uint16 *)currentLineBuffer = paletteRAM16[index | bits];
1353                                 else
1354                                         *currentLineBuffer =
1355                                                 BLEND_CR(*currentLineBuffer, paletteRAM[(index | bits) << 1]),
1356                                         *(currentLineBuffer + 1) =
1357                                                 BLEND_Y(*(currentLineBuffer + 1), paletteRAM[((index | bits) << 1) + 1]);
1358                         }
1359
1360                         currentLineBuffer += lbufDelta;
1361
1362 /*                      horizontalRemainder -= 0x20;            // Subtract 1.0f in [3.5] fixed point format
1363                         while (horizontalRemainder & 0x80)
1364                         {
1365                                 horizontalRemainder += hscale;
1366                                 pixCount++;
1367                                 pixels <<= 1;
1368                         }//*/
1369                         while (horizontalRemainder <= 0x20)             // I.e., it's <= 0 (*before* subtraction)
1370                         {
1371                                 horizontalRemainder += hscale;
1372                                 pixCount++;
1373                                 pixels <<= 1;
1374                         }
1375                         horizontalRemainder -= 0x20;            // Subtract 1.0f in [3.5] fixed point format
1376
1377                         if (pixCount > 63)
1378                         {
1379                                 int phrasesToSkip = pixCount / 64, pixelShift = pixCount % 64;
1380
1381                                 data += (pitch << 3) * phrasesToSkip;
1382                                 pixels = ((uint64)JaguarReadLong(data, OP) << 32) | JaguarReadLong(data + 4, OP);
1383                                 pixels <<= 1 * pixelShift;
1384                                 iwidth -= phrasesToSkip;
1385                                 pixCount = pixelShift;
1386                         }
1387                 }
1388         }
1389         else if (depth == 1)                                                    // 2 BPP
1390         {
1391 if (firstPix != 0)
1392         WriteLog("OP: Scaled bitmap @ 2 BPP requesting FIRSTPIX!\n");
1393                 index &= 0xFC;                                                          // Top six bits form CLUT index
1394                 // The LSB is OPFLAG_REFLECT, so sign extend it and or 2 into it.
1395                 int32 lbufDelta = ((int8)((flags << 7) & 0xFF) >> 5) | 0x02;
1396
1397                 int pixCount = 0;
1398                 uint64 pixels = ((uint64)JaguarReadLong(data, OP) << 32) | JaguarReadLong(data + 4, OP);
1399
1400                 while ((int32)iwidth > 0)
1401                 {
1402                         uint8 bits = pixels >> 62;
1403
1404                         if (flagTRANS && bits == 0)
1405                                 ;       // Do nothing...
1406                         else
1407                         {
1408                                 if (!flagRMW)
1409                                         // This is the *only* correct use of endian-dependent code
1410                                         // (i.e., mem-to-mem direct copying)!
1411                                         *(uint16 *)currentLineBuffer = paletteRAM16[index | bits];
1412                                 else
1413                                         *currentLineBuffer =
1414                                                 BLEND_CR(*currentLineBuffer, paletteRAM[(index | bits) << 1]),
1415                                         *(currentLineBuffer + 1) =
1416                                                 BLEND_Y(*(currentLineBuffer + 1), paletteRAM[((index | bits) << 1) + 1]);
1417                         }
1418
1419                         currentLineBuffer += lbufDelta;
1420
1421 /*                      horizontalRemainder -= 0x20;            // Subtract 1.0f in [3.5] fixed point format
1422                         while (horizontalRemainder & 0x80)
1423                         {
1424                                 horizontalRemainder += hscale;
1425                                 pixCount++;
1426                                 pixels <<= 2;
1427                         }//*/
1428                         while (horizontalRemainder <= 0x20)             // I.e., it's <= 0 (*before* subtraction)
1429                         {
1430                                 horizontalRemainder += hscale;
1431                                 pixCount++;
1432                                 pixels <<= 2;
1433                         }
1434                         horizontalRemainder -= 0x20;            // Subtract 1.0f in [3.5] fixed point format
1435
1436                         if (pixCount > 31)
1437                         {
1438                                 int phrasesToSkip = pixCount / 32, pixelShift = pixCount % 32;
1439
1440                                 data += (pitch << 3) * phrasesToSkip;
1441                                 pixels = ((uint64)JaguarReadLong(data, OP) << 32) | JaguarReadLong(data + 4, OP);
1442                                 pixels <<= 2 * pixelShift;
1443                                 iwidth -= phrasesToSkip;
1444                                 pixCount = pixelShift;
1445                         }
1446                 }
1447         }
1448         else if (depth == 2)                                                    // 4 BPP
1449         {
1450 if (firstPix != 0)
1451         WriteLog("OP: Scaled bitmap @ 4 BPP requesting FIRSTPIX!\n");
1452                 index &= 0xF0;                                                          // Top four bits form CLUT index
1453                 // The LSB is OPFLAG_REFLECT, so sign extend it and or 2 into it.
1454                 int32 lbufDelta = ((int8)((flags << 7) & 0xFF) >> 5) | 0x02;
1455
1456                 int pixCount = 0;
1457                 uint64 pixels = ((uint64)JaguarReadLong(data, OP) << 32) | JaguarReadLong(data + 4, OP);
1458
1459                 while ((int32)iwidth > 0)
1460                 {
1461                         uint8 bits = pixels >> 60;
1462
1463                         if (flagTRANS && bits == 0)
1464                                 ;       // Do nothing...
1465                         else
1466                         {
1467                                 if (!flagRMW)
1468                                         // This is the *only* correct use of endian-dependent code
1469                                         // (i.e., mem-to-mem direct copying)!
1470                                         *(uint16 *)currentLineBuffer = paletteRAM16[index | bits];
1471                                 else
1472                                         *currentLineBuffer =
1473                                                 BLEND_CR(*currentLineBuffer, paletteRAM[(index | bits) << 1]),
1474                                         *(currentLineBuffer + 1) =
1475                                                 BLEND_Y(*(currentLineBuffer + 1), paletteRAM[((index | bits) << 1) + 1]);
1476                         }
1477
1478                         currentLineBuffer += lbufDelta;
1479
1480 /*                      horizontalRemainder -= 0x20;            // Subtract 1.0f in [3.5] fixed point format
1481                         while (horizontalRemainder & 0x80)
1482                         {
1483                                 horizontalRemainder += hscale;
1484                                 pixCount++;
1485                                 pixels <<= 4;
1486                         }//*/
1487                         while (horizontalRemainder <= 0x20)             // I.e., it's <= 0 (*before* subtraction)
1488                         {
1489                                 horizontalRemainder += hscale;
1490                                 pixCount++;
1491                                 pixels <<= 4;
1492                         }
1493                         horizontalRemainder -= 0x20;            // Subtract 1.0f in [3.5] fixed point format
1494
1495                         if (pixCount > 15)
1496                         {
1497                                 int phrasesToSkip = pixCount / 16, pixelShift = pixCount % 16;
1498
1499                                 data += (pitch << 3) * phrasesToSkip;
1500                                 pixels = ((uint64)JaguarReadLong(data, OP) << 32) | JaguarReadLong(data + 4, OP);
1501                                 pixels <<= 4 * pixelShift;
1502                                 iwidth -= phrasesToSkip;
1503                                 pixCount = pixelShift;
1504                         }
1505                 }
1506         }
1507         else if (depth == 3)                                                    // 8 BPP
1508         {
1509 if (firstPix)
1510         WriteLog("OP: Scaled bitmap @ 8 BPP requesting FIRSTPIX! (fp=%u)\n", firstPix);
1511                 // The LSB is OPFLAG_REFLECT, so sign extend it and or 2 into it.
1512                 int32 lbufDelta = ((int8)((flags << 7) & 0xFF) >> 5) | 0x02;
1513
1514                 int pixCount = 0;
1515                 uint64 pixels = ((uint64)JaguarReadLong(data, OP) << 32) | JaguarReadLong(data + 4, OP);
1516
1517                 while ((int32)iwidth > 0)
1518                 {
1519                         uint8 bits = pixels >> 56;
1520
1521                         if (flagTRANS && bits == 0)
1522                                 ;       // Do nothing...
1523                         else
1524                         {
1525                                 if (!flagRMW)
1526                                         // This is the *only* correct use of endian-dependent code
1527                                         // (i.e., mem-to-mem direct copying)!
1528                                         *(uint16 *)currentLineBuffer = paletteRAM16[bits];
1529 /*                              {
1530                                         if (currentLineBuffer >= lineBufferLowerLimit && currentLineBuffer <= lineBufferUpperLimit)
1531                                                 *(uint16 *)currentLineBuffer = paletteRAM16[bits];
1532                                 }*/
1533                                 else
1534                                         *currentLineBuffer =
1535                                                 BLEND_CR(*currentLineBuffer, paletteRAM[bits << 1]),
1536                                         *(currentLineBuffer + 1) =
1537                                                 BLEND_Y(*(currentLineBuffer + 1), paletteRAM[(bits << 1) + 1]);
1538                         }
1539
1540                         currentLineBuffer += lbufDelta;
1541
1542                         while (horizontalRemainder <= 0x20)             // I.e., it's <= 0 (*before* subtraction)
1543                         {
1544                                 horizontalRemainder += hscale;
1545                                 pixCount++;
1546                                 pixels <<= 8;
1547                         }
1548                         horizontalRemainder -= 0x20;            // Subtract 1.0f in [3.5] fixed point format
1549
1550                         if (pixCount > 7)
1551                         {
1552                                 int phrasesToSkip = pixCount / 8, pixelShift = pixCount % 8;
1553
1554                                 data += (pitch << 3) * phrasesToSkip;
1555                                 pixels = ((uint64)JaguarReadLong(data, OP) << 32) | JaguarReadLong(data + 4, OP);
1556                                 pixels <<= 8 * pixelShift;
1557                                 iwidth -= phrasesToSkip;
1558                                 pixCount = pixelShift;
1559                         }
1560                 }
1561         }
1562         else if (depth == 4)                                                    // 16 BPP
1563         {
1564 if (firstPix != 0)
1565         WriteLog("OP: Scaled bitmap @ 16 BPP requesting FIRSTPIX!\n");
1566                 // The LSB is OPFLAG_REFLECT, so sign extend it and OR 2 into it.
1567                 int32 lbufDelta = ((int8)((flags << 7) & 0xFF) >> 5) | 0x02;
1568
1569                 int pixCount = 0;
1570                 uint64 pixels = ((uint64)JaguarReadLong(data, OP) << 32) | JaguarReadLong(data + 4, OP);
1571
1572                 while ((int32)iwidth > 0)
1573                 {
1574                         uint8 bitsHi = pixels >> 56, bitsLo = pixels >> 48;
1575
1576                         if (flagTRANS && (bitsLo | bitsHi) == 0)
1577                                 ;       // Do nothing...
1578                         else
1579                         {
1580                                 if (!flagRMW)
1581                                         *currentLineBuffer = bitsHi,
1582                                         *(currentLineBuffer + 1) = bitsLo;
1583                                 else
1584                                         *currentLineBuffer =
1585                                                 BLEND_CR(*currentLineBuffer, bitsHi),
1586                                         *(currentLineBuffer + 1) =
1587                                                 BLEND_Y(*(currentLineBuffer + 1), bitsLo);
1588                         }
1589
1590                         currentLineBuffer += lbufDelta;
1591
1592 /*                      horizontalRemainder -= 0x20;            // Subtract 1.0f in [3.5] fixed point format
1593                         while (horizontalRemainder & 0x80)
1594                         {
1595                                 horizontalRemainder += hscale;
1596                                 pixCount++;
1597                                 pixels <<= 16;
1598                         }//*/
1599                         while (horizontalRemainder <= 0x20)             // I.e., it's <= 0 (*before* subtraction)
1600                         {
1601                                 horizontalRemainder += hscale;
1602                                 pixCount++;
1603                                 pixels <<= 16;
1604                         }
1605                         horizontalRemainder -= 0x20;            // Subtract 1.0f in [3.5] fixed point format
1606 //*/
1607                         if (pixCount > 3)
1608                         {
1609                                 int phrasesToSkip = pixCount / 4, pixelShift = pixCount % 4;
1610
1611                                 data += (pitch << 3) * phrasesToSkip;
1612                                 pixels = ((uint64)JaguarReadLong(data, OP) << 32) | JaguarReadLong(data + 4, OP);
1613                                 pixels <<= 16 * pixelShift;
1614
1615                                 iwidth -= phrasesToSkip;
1616
1617                                 pixCount = pixelShift;
1618                         }
1619                 }
1620         }
1621         else if (depth == 5)                                                    // 24 BPP
1622         {
1623 //I'm not sure that you can scale a 24 BPP bitmap properly--the JTRM seem to indicate as much.
1624 WriteLog("OP: Writing 24 BPP scaled bitmap!\n");
1625 if (firstPix != 0)
1626         WriteLog("OP: Scaled bitmap @ 24 BPP requesting FIRSTPIX!\n");
1627                 // Not sure, but I think RMW only works with 16 BPP and below, and only in CRY mode...
1628                 // The LSB is OPFLAG_REFLECT, so sign extend it and or 4 into it.
1629                 int32 lbufDelta = ((int8)((flags << 7) & 0xFF) >> 4) | 0x04;
1630
1631                 while (iwidth--)
1632                 {
1633                         // Fetch phrase...
1634                         uint64 pixels = ((uint64)JaguarReadLong(data, OP) << 32) | JaguarReadLong(data + 4, OP);
1635                         data += pitch << 3;                                             // Multiply pitch * 8 (optimize: precompute this value)
1636
1637                         for(int i=0; i<2; i++)
1638                         {
1639                                 uint8 bits3 = pixels >> 56, bits2 = pixels >> 48,
1640                                         bits1 = pixels >> 40, bits0 = pixels >> 32;
1641
1642                                 if (flagTRANS && (bits3 | bits2 | bits1 | bits0) == 0)
1643                                         ;       // Do nothing...
1644                                 else
1645                                         *currentLineBuffer = bits3,
1646                                         *(currentLineBuffer + 1) = bits2,
1647                                         *(currentLineBuffer + 2) = bits1,
1648                                         *(currentLineBuffer + 3) = bits0;
1649
1650                                 currentLineBuffer += lbufDelta;
1651                                 pixels <<= 32;
1652                         }
1653                 }
1654         }
1655 }