pico/draw2.c

   1 // This is part of Pico Library\r
   2 \r
   3 // (c) Copyright 2007, Grazvydas "notaz" Ignotas\r
   4 // Free for non-commercial use.\r
   5 \r
   6 // For commercial use, separate licencing terms must be obtained.\r
   7 \r
   8 \r
   9 // this is a frame-based renderer, alternative to Dave's line based which is in Draw.c\r
  10 \r
  11 \r
  12 #include "pico_int.h"\r
  13 \r
  14 // port_config.h include must define these 2 defines:\r
  15 // #define START_ROW  1 // which row of tiles to start rendering at?\r
  16 // #define END_ROW   27 // ..end\r
  17 // one row means 8 pixels. If above example was used, (27-1)*8=208 lines would be rendered.\r
  18 \r
  19 #define TILE_ROWS END_ROW-START_ROW\r
  20 \r
  21 #define USE_CACHE\r
  22 \r
  23 // note: this is not implemented in ARM asm\r
  24 #if defined(DRAW2_OVERRIDE_LINE_WIDTH)\r
  25 #define LINE_WIDTH DRAW2_OVERRIDE_LINE_WIDTH\r
  26 #else\r
  27 #define LINE_WIDTH 328\r
  28 #endif\r
  29 \r
  30 static int HighCache2A[41*(TILE_ROWS+1)+1+1]; // caches for high layers\r
  31 static int HighCache2B[41*(TILE_ROWS+1)+1+1];\r
  32 \r
  33 unsigned short *PicoCramHigh=Pico.cram; // pointer to CRAM buff (0x40 shorts), converted to native device color (works only with 16bit for now)\r
  34 void (*PicoPrepareCram)()=0;            // prepares PicoCramHigh for renderer to use\r
  35 \r
  36 \r
  37 // stuff available in asm:\r
  38 #ifdef _ASM_DRAW_C\r
  39 void BackFillFull(int reg7);\r
  40 void DrawLayerFull(int plane, int *hcache, int planestart, int planeend);\r
  41 void DrawTilesFromCacheF(int *hc);\r
  42 void DrawWindowFull(int start, int end, int prio);\r
  43 void DrawSpriteFull(unsigned int *sprite);\r
  44 #else\r
  45 \r
  46 \r
  47 static int TileXnormYnorm(unsigned char *pd,int addr,unsigned char pal)\r
  48 {\r
  49         unsigned int pack=0; unsigned int t=0, blank = 1;\r
  50         int i;\r
  51 \r
  52         for(i=8; i; i--, addr+=2, pd += LINE_WIDTH) {\r
  53                 pack=*(unsigned int *)(Pico.vram+addr); // Get 8 pixels\r
  54                 if(!pack) continue;\r
  55 \r
  56                 t=pack&0x0000f000; if (t) pd[0]=(unsigned char)((t>>12)|pal);\r
  57                 t=pack&0x00000f00; if (t) pd[1]=(unsigned char)((t>> 8)|pal);\r
  58                 t=pack&0x000000f0; if (t) pd[2]=(unsigned char)((t>> 4)|pal);\r
  59                 t=pack&0x0000000f; if (t) pd[3]=(unsigned char)((t    )|pal);\r
  60                 t=pack&0xf0000000; if (t) pd[4]=(unsigned char)((t>>28)|pal);\r
  61                 t=pack&0x0f000000; if (t) pd[5]=(unsigned char)((t>>24)|pal);\r
  62                 t=pack&0x00f00000; if (t) pd[6]=(unsigned char)((t>>20)|pal);\r
  63                 t=pack&0x000f0000; if (t) pd[7]=(unsigned char)((t>>16)|pal);\r
  64                 blank = 0;\r
  65         }\r
  66 \r
  67         return blank; // Tile blank?\r
  68 }\r
  69 \r
  70 static int TileXflipYnorm(unsigned char *pd,int addr,unsigned char pal)\r
  71 {\r
  72         unsigned int pack=0; unsigned int t=0, blank = 1;\r
  73         int i;\r
  74 \r
  75         for(i=8; i; i--, addr+=2, pd += LINE_WIDTH) {\r
  76                 pack=*(unsigned int *)(Pico.vram+addr); // Get 8 pixels\r
  77                 if(!pack) continue;\r
  78 \r
  79                 t=pack&0x000f0000; if (t) pd[0]=(unsigned char)((t>>16)|pal);\r
  80                 t=pack&0x00f00000; if (t) pd[1]=(unsigned char)((t>>20)|pal);\r
  81                 t=pack&0x0f000000; if (t) pd[2]=(unsigned char)((t>>24)|pal);\r
  82                 t=pack&0xf0000000; if (t) pd[3]=(unsigned char)((t>>28)|pal);\r
  83                 t=pack&0x0000000f; if (t) pd[4]=(unsigned char)((t    )|pal);\r
  84                 t=pack&0x000000f0; if (t) pd[5]=(unsigned char)((t>> 4)|pal);\r
  85                 t=pack&0x00000f00; if (t) pd[6]=(unsigned char)((t>> 8)|pal);\r
  86                 t=pack&0x0000f000; if (t) pd[7]=(unsigned char)((t>>12)|pal);\r
  87                 blank = 0;\r
  88         }\r
  89         return blank; // Tile blank?\r
  90 }\r
  91 \r
  92 static int TileXnormYflip(unsigned char *pd,int addr,unsigned char pal)\r
  93 {\r
  94         unsigned int pack=0; unsigned int t=0, blank = 1;\r
  95         int i;\r
  96 \r
  97         addr+=14;\r
  98         for(i=8; i; i--, addr-=2, pd += LINE_WIDTH) {\r
  99                 pack=*(unsigned int *)(Pico.vram+addr); // Get 8 pixels\r
 100                 if(!pack) continue;\r
 101 \r
 102                 t=pack&0x0000f000; if (t) pd[0]=(unsigned char)((t>>12)|pal);\r
 103                 t=pack&0x00000f00; if (t) pd[1]=(unsigned char)((t>> 8)|pal);\r
 104                 t=pack&0x000000f0; if (t) pd[2]=(unsigned char)((t>> 4)|pal);\r
 105                 t=pack&0x0000000f; if (t) pd[3]=(unsigned char)((t    )|pal);\r
 106                 t=pack&0xf0000000; if (t) pd[4]=(unsigned char)((t>>28)|pal);\r
 107                 t=pack&0x0f000000; if (t) pd[5]=(unsigned char)((t>>24)|pal);\r
 108                 t=pack&0x00f00000; if (t) pd[6]=(unsigned char)((t>>20)|pal);\r
 109                 t=pack&0x000f0000; if (t) pd[7]=(unsigned char)((t>>16)|pal);\r
 110                 blank = 0;\r
 111         }\r
 112 \r
 113         return blank; // Tile blank?\r
 114 }\r
 115 \r
 116 static int TileXflipYflip(unsigned char *pd,int addr,unsigned char pal)\r
 117 {\r
 118         unsigned int pack=0; unsigned int t=0, blank = 1;\r
 119         int i;\r
 120 \r
 121         addr+=14;\r
 122         for(i=8; i; i--, addr-=2, pd += LINE_WIDTH) {\r
 123                 pack=*(unsigned int *)(Pico.vram+addr); // Get 8 pixels\r
 124                 if(!pack) continue;\r
 125 \r
 126                 t=pack&0x000f0000; if (t) pd[0]=(unsigned char)((t>>16)|pal);\r
 127                 t=pack&0x00f00000; if (t) pd[1]=(unsigned char)((t>>20)|pal);\r
 128                 t=pack&0x0f000000; if (t) pd[2]=(unsigned char)((t>>24)|pal);\r
 129                 t=pack&0xf0000000; if (t) pd[3]=(unsigned char)((t>>28)|pal);\r
 130                 t=pack&0x0000000f; if (t) pd[4]=(unsigned char)((t    )|pal);\r
 131                 t=pack&0x000000f0; if (t) pd[5]=(unsigned char)((t>> 4)|pal);\r
 132                 t=pack&0x00000f00; if (t) pd[6]=(unsigned char)((t>> 8)|pal);\r
 133                 t=pack&0x0000f000; if (t) pd[7]=(unsigned char)((t>>12)|pal);\r
 134                 blank = 0;\r
 135         }\r
 136         return blank; // Tile blank?\r
 137 }\r
 138 \r
 139 \r
 140 // start: (tile_start<<16)|row_start, end: [same]\r
 141 static void DrawWindowFull(int start, int end, int prio)\r
 142 {\r
 143         struct PicoVideo *pvid=&Pico.video;\r
 144         int nametab, nametab_step, trow, tilex, blank=-1, code;\r
 145         unsigned char *scrpos = PicoDraw2FB;\r
 146         int tile_start, tile_end; // in cells\r
 147 \r
 148         // parse ranges\r
 149         tile_start = start>>16;\r
 150         tile_end = end>>16;\r
 151         start = start<<16>>16;\r
 152         end = end<<16>>16;\r
 153 \r
 154         // Find name table line:\r
 155         if (pvid->reg[12]&1)\r
 156         {\r
 157                 nametab=(pvid->reg[3]&0x3c)<<9; // 40-cell mode\r
 158                 nametab_step = 1<<6;\r
 159         }\r
 160         else\r
 161         {\r
 162                 nametab=(pvid->reg[3]&0x3e)<<9; // 32-cell mode\r
 163                 nametab_step = 1<<5;\r
 164         }\r
 165         nametab += nametab_step*start;\r
 166 \r
 167         // check priority\r
 168         code=Pico.vram[nametab+tile_start];\r
 169         if ((code>>15) != prio) return; // hack: just assume that whole window uses same priority\r
 170 \r
 171         scrpos+=8*LINE_WIDTH+8;\r
 172         scrpos+=8*LINE_WIDTH*(start-START_ROW);\r
 173 \r
 174         // do a window until we reach planestart row\r
 175         for(trow = start; trow < end; trow++, nametab+=nametab_step) { // current tile row\r
 176                 for (tilex=tile_start; tilex<tile_end; tilex++)\r
 177                 {\r
 178                         int code,addr,zero=0;\r
 179 //                      unsigned short *pal=NULL;\r
 180                         unsigned char pal;\r
 181 \r
 182                         code=Pico.vram[nametab+tilex];\r
 183                         if (code==blank) continue;\r
 184 \r
 185                         // Get tile address/2:\r
 186                         addr=(code&0x7ff)<<4;\r
 187 \r
 188 //                      pal=PicoCramHigh+((code>>9)&0x30);\r
 189                         pal=(unsigned char)((code>>9)&0x30);\r
 190 \r
 191                         switch((code>>11)&3) {\r
 192                                 case 0: zero=TileXnormYnorm(scrpos+(tilex<<3),addr,pal); break;\r
 193                                 case 1: zero=TileXflipYnorm(scrpos+(tilex<<3),addr,pal); break;\r
 194                                 case 2: zero=TileXnormYflip(scrpos+(tilex<<3),addr,pal); break;\r
 195                                 case 3: zero=TileXflipYflip(scrpos+(tilex<<3),addr,pal); break;\r
 196                         }\r
 197                         if(zero) blank=code; // We know this tile is blank now\r
 198                 }\r
 199 \r
 200                 scrpos += LINE_WIDTH*8;\r
 201         }\r
 202 }\r
 203 \r
 204 \r
 205 static void DrawLayerFull(int plane, int *hcache, int planestart, int planeend)\r
 206 {\r
 207         struct PicoVideo *pvid=&Pico.video;\r
 208         static char shift[4]={5,6,6,7}; // 32,64 or 128 sized tilemaps\r
 209         int width, height, ymask, htab;\r
 210         int nametab, hscroll=0, vscroll, cells;\r
 211         unsigned char *scrpos;\r
 212         int blank=-1, xmask, nametab_row, trow;\r
 213 \r
 214         // parse ranges\r
 215         cells = (planeend>>16)-(planestart>>16);\r
 216         planestart = planestart<<16>>16;\r
 217         planeend = planeend<<16>>16;\r
 218 \r
 219         // Work out the Tiles to draw\r
 220 \r
 221         htab=pvid->reg[13]<<9; // Horizontal scroll table address\r
 222 //      if ( pvid->reg[11]&2)     htab+=Scanline<<1; // Offset by line\r
 223 //      if ((pvid->reg[11]&1)==0) htab&=~0xf; // Offset by tile\r
 224         htab+=plane; // A or B\r
 225 \r
 226         if(!(pvid->reg[11]&3)) { // full screen scroll\r
 227                 // Get horizontal scroll value\r
 228                 hscroll=Pico.vram[htab&0x7fff];\r
 229                 htab = 0; // this marks that we don't have to update scroll value\r
 230         }\r
 231 \r
 232         // Work out the name table size: 32 64 or 128 tiles (0-3)\r
 233         width=pvid->reg[16];\r
 234         height=(width>>4)&3; width&=3;\r
 235 \r
 236         xmask=(1<<shift[width ])-1; // X Mask in tiles\r
 237         ymask=(height<<5)|0x1f;     // Y Mask in tiles\r
 238         if(width == 1)   ymask&=0x3f;\r
 239         else if(width>1) ymask =0x1f;\r
 240 \r
 241         // Find name table:\r
 242         if (plane==0) nametab=(pvid->reg[2]&0x38)<< 9; // A\r
 243         else          nametab=(pvid->reg[4]&0x07)<<12; // B\r
 244 \r
 245         scrpos = PicoDraw2FB;\r
 246         scrpos+=8*LINE_WIDTH*(planestart-START_ROW);\r
 247 \r
 248         // Get vertical scroll value:\r
 249         vscroll=Pico.vsram[plane]&0x1ff;\r
 250         scrpos+=(8-(vscroll&7))*LINE_WIDTH;\r
 251         if(vscroll&7) planeend++; // we have vertically clipped tiles due to vscroll, so we need 1 more row\r
 252 \r
 253         *hcache++ = 8-(vscroll&7); // push y-offset to tilecache\r
 254 \r
 255 \r
 256         for(trow = planestart; trow < planeend; trow++) { // current tile row\r
 257                 int cellc=cells,tilex,dx;\r
 258 \r
 259                 // Find the tile row in the name table\r
 260                 //ts.line=(vscroll+Scanline)&ymask;\r
 261                 //ts.nametab+=(ts.line>>3)<<shift[width];\r
 262                 nametab_row = nametab + (((trow+(vscroll>>3))&ymask)<<shift[width]); // pointer to nametable entries for this row\r
 263 \r
 264                 // update hscroll if needed\r
 265                 if(htab) {\r
 266                         int htaddr=htab+(trow<<4);\r
 267                         if(trow) htaddr-=(vscroll&7)<<1;\r
 268                         hscroll=Pico.vram[htaddr&0x7fff];\r
 269                 }\r
 270 \r
 271                 // Draw tiles across screen:\r
 272                 tilex=(-hscroll)>>3;\r
 273                 dx=((hscroll-1)&7)+1;\r
 274                 if(dx != 8) cellc++; // have hscroll, do more cells\r
 275 \r
 276                 for (; cellc; dx+=8,tilex++,cellc--)\r
 277                 {\r
 278                         int code=0,addr=0,zero=0;\r
 279 //                      unsigned short *pal=NULL;\r
 280                         unsigned char pal;\r
 281 \r
 282                         code=Pico.vram[nametab_row+(tilex&xmask)];\r
 283                         if (code==blank) continue;\r
 284 \r
 285                         if (code>>15) { // high priority tile\r
 286                                 *hcache++ = code|(dx<<16)|(trow<<27); // cache it\r
 287                                 continue;\r
 288                         }\r
 289 \r
 290                         // Get tile address/2:\r
 291                         addr=(code&0x7ff)<<4;\r
 292 \r
 293 //                      pal=PicoCramHigh+((code>>9)&0x30);\r
 294                         pal=(unsigned char)((code>>9)&0x30);\r
 295 \r
 296                         switch((code>>11)&3) {\r
 297                                 case 0: zero=TileXnormYnorm(scrpos+dx,addr,pal); break;\r
 298                                 case 1: zero=TileXflipYnorm(scrpos+dx,addr,pal); break;\r
 299                                 case 2: zero=TileXnormYflip(scrpos+dx,addr,pal); break;\r
 300                                 case 3: zero=TileXflipYflip(scrpos+dx,addr,pal); break;\r
 301                         }\r
 302                         if(zero) blank=code; // We know this tile is blank now\r
 303                 }\r
 304 \r
 305                 scrpos += LINE_WIDTH*8;\r
 306         }\r
 307 \r
 308         *hcache = 0; // terminate cache\r
 309 }\r
 310 \r
 311 \r
 312 static void DrawTilesFromCacheF(int *hc)\r
 313 {\r
 314         int code, addr, zero = 0;\r
 315         unsigned int prevy=0xFFFFFFFF;\r
 316 //      unsigned short *pal;\r
 317         unsigned char pal;\r
 318         short blank=-1; // The tile we know is blank\r
 319         unsigned char *scrpos = PicoDraw2FB, *pd = 0;\r
 320 \r
 321         // *hcache++ = code|(dx<<16)|(trow<<27); // cache it\r
 322         scrpos+=(*hc++)*LINE_WIDTH - START_ROW*LINE_WIDTH*8;\r
 323 \r
 324         while((code=*hc++)) {\r
 325                 if((short)code == blank) continue;\r
 326 \r
 327                 // y pos\r
 328                 if(((unsigned)code>>27) != prevy) {\r
 329                         prevy = (unsigned)code>>27;\r
 330                         pd = scrpos + prevy*LINE_WIDTH*8;\r
 331                 }\r
 332 \r
 333                 // Get tile address/2:\r
 334                 addr=(code&0x7ff)<<4;\r
 335 //              pal=PicoCramHigh+((code>>9)&0x30);\r
 336                 pal=(unsigned char)((code>>9)&0x30);\r
 337 \r
 338                 switch((code>>11)&3) {\r
 339                         case 0: zero=TileXnormYnorm(pd+((code>>16)&0x1ff),addr,pal); break;\r
 340                         case 1: zero=TileXflipYnorm(pd+((code>>16)&0x1ff),addr,pal); break;\r
 341                         case 2: zero=TileXnormYflip(pd+((code>>16)&0x1ff),addr,pal); break;\r
 342                         case 3: zero=TileXflipYflip(pd+((code>>16)&0x1ff),addr,pal); break;\r
 343                 }\r
 344 \r
 345                 if(zero) blank=(short)code;\r
 346         }\r
 347 }\r
 348 \r
 349 \r
 350 // sx and sy are coords of virtual screen with 8pix borders on top and on left\r
 351 static void DrawSpriteFull(unsigned int *sprite)\r
 352 {\r
 353         int width=0,height=0;\r
 354 //      unsigned short *pal=NULL;\r
 355         unsigned char pal;\r
 356         int tile,code,tdeltax,tdeltay;\r
 357         unsigned char *scrpos;\r
 358         int sx, sy;\r
 359 \r
 360         sy=sprite[0];\r
 361         height=sy>>24;\r
 362         sy=(sy&0x1ff)-0x78; // Y\r
 363         width=(height>>2)&3; height&=3;\r
 364         width++; height++; // Width and height in tiles\r
 365 \r
 366         code=sprite[1];\r
 367         sx=((code>>16)&0x1ff)-0x78; // X\r
 368 \r
 369         tile=code&0x7ff; // Tile number\r
 370         tdeltax=height; // Delta to increase tile by going right\r
 371         tdeltay=1;      // Delta to increase tile by going down\r
 372         if (code&0x0800) { tdeltax=-tdeltax; tile+=height*(width-1); } // Flip X\r
 373         if (code&0x1000) { tdeltay=-tdeltay; tile+=height-1; } // Flip Y\r
 374 \r
 375         //delta<<=4; // Delta of address\r
 376 //      pal=PicoCramHigh+((code>>9)&0x30); // Get palette pointer\r
 377         pal=(unsigned char)((code>>9)&0x30);\r
 378 \r
 379         // goto first vertically visible tile\r
 380         while(sy <= START_ROW*8) { sy+=8; tile+=tdeltay; height--; }\r
 381 \r
 382         scrpos = PicoDraw2FB;\r
 383         scrpos+=(sy-START_ROW*8)*LINE_WIDTH;\r
 384 \r
 385         for (; height > 0; height--, sy+=8, tile+=tdeltay)\r
 386         {\r
 387                 int w = width, x=sx, t=tile;\r
 388 \r
 389                 if(sy >= END_ROW*8+8) return; // offscreen\r
 390 \r
 391                 for (; w; w--,x+=8,t+=tdeltax)\r
 392                 {\r
 393                         if(x<=0)   continue;\r
 394                         if(x>=328) break; // Offscreen\r
 395 \r
 396                         t&=0x7fff; // Clip tile address\r
 397                         switch((code>>11)&3) {\r
 398                                 case 0: TileXnormYnorm(scrpos+x,t<<4,pal); break;\r
 399                                 case 1: TileXflipYnorm(scrpos+x,t<<4,pal); break;\r
 400                                 case 2: TileXnormYflip(scrpos+x,t<<4,pal); break;\r
 401                                 case 3: TileXflipYflip(scrpos+x,t<<4,pal); break;\r
 402                         }\r
 403                 }\r
 404 \r
 405                 scrpos+=8*LINE_WIDTH;\r
 406         }\r
 407 }\r
 408 #endif\r
 409 \r
 410 \r
 411 static void DrawAllSpritesFull(int prio, int maxwidth)\r
 412 {\r
 413         struct PicoVideo *pvid=&Pico.video;\r
 414         int table=0,maskrange=0;\r
 415         int i,u,link=0;\r
 416         unsigned int *sprites[80]; // Sprites\r
 417         int y_min=START_ROW*8, y_max=END_ROW*8; // for a simple sprite masking\r
 418 \r
 419         table=pvid->reg[5]&0x7f;\r
 420         if (pvid->reg[12]&1) table&=0x7e; // Lowest bit 0 in 40-cell mode\r
 421         table<<=8; // Get sprite table address/2\r
 422 \r
 423         for (i=u=0; u < 80; u++)\r
 424         {\r
 425                 unsigned int *sprite=NULL;\r
 426                 int code, code2, sx, sy, height;\r
 427 \r
 428                 sprite=(unsigned int *)(Pico.vram+((table+(link<<2))&0x7ffc)); // Find sprite\r
 429 \r
 430                 // get sprite info\r
 431                 code = sprite[0];\r
 432 \r
 433                 // check if it is not hidden vertically\r
 434                 sy = (code&0x1ff)-0x80;\r
 435                 height = (((code>>24)&3)+1)<<3;\r
 436                 if(sy+height <= y_min || sy > y_max) goto nextsprite;\r
 437 \r
 438                 // masking sprite?\r
 439                 code2=sprite[1];\r
 440                 sx = (code2>>16)&0x1ff;\r
 441                 if(!sx) {\r
 442                         int to = sy+height; // sy ~ from\r
 443                         if(maskrange) {\r
 444                                 // try to merge with previous range\r
 445                                 if((maskrange>>16)+1 >= sy && (maskrange>>16) <= to && (maskrange&0xffff) < sy) sy = (maskrange&0xffff);\r
 446                                 else if((maskrange&0xffff)-1 <= to && (maskrange&0xffff) >= sy && (maskrange>>16) > to) to = (maskrange>>16);\r
 447                         }\r
 448                         // support only very simple masking (top and bottom of screen)\r
 449                         if(sy <= y_min && to+1 > y_min) y_min = to+1;\r
 450                         else if(to >= y_max && sy-1 < y_max) y_max = sy-1;\r
 451                         else maskrange=sy|(to<<16);\r
 452 \r
 453                         goto nextsprite;\r
 454                 }\r
 455 \r
 456                 // priority\r
 457                 if(((code2>>15)&1) != prio) goto nextsprite; // wrong priority\r
 458 \r
 459                 // check if sprite is not hidden horizontally\r
 460                 sx -= 0x78; // Get X coordinate + 8\r
 461                 if(sx <= -8*3 || sx >= maxwidth) goto nextsprite;\r
 462 \r
 463                 // sprite is good, save it's index\r
 464                 sprites[i++]=sprite;\r
 465 \r
 466                 nextsprite:\r
 467                 // Find next sprite\r
 468                 link=(code>>16)&0x7f;\r
 469                 if(!link) break; // End of sprites\r
 470         }\r
 471 \r
 472         // Go through sprites backwards:\r
 473         for (i-- ;i>=0; i--)\r
 474         {\r
 475                 DrawSpriteFull(sprites[i]);\r
 476         }\r
 477 }\r
 478 \r
 479 #ifndef _ASM_DRAW_C\r
 480 static void BackFillFull(int reg7)\r
 481 {\r
 482         unsigned int back;\r
 483 \r
 484         // Start with a background color:\r
 485 //      back=PicoCramHigh[reg7&0x3f];\r
 486         back=reg7&0x3f;\r
 487         back|=back<<8;\r
 488         back|=back<<16;\r
 489 \r
 490         memset32((int *)PicoDraw2FB, back, LINE_WIDTH*(8+(END_ROW-START_ROW)*8)/4);\r
 491 }\r
 492 #endif\r
 493 \r
 494 static void DrawDisplayFull(void)\r
 495 {\r
 496         struct PicoVideo *pvid=&Pico.video;\r
 497         int win, edge=0, hvwin=0; // LSb->MSb: hwin&plane, vwin&plane, full\r
 498         int planestart=START_ROW, planeend=END_ROW; // plane A start/end when window shares display with plane A (in tile rows or columns)\r
 499         int winstart=START_ROW, winend=END_ROW;     // same for window\r
 500         int maxw, maxcolc; // max width and col cells\r
 501 \r
 502         if(pvid->reg[12]&1) {\r
 503                 maxw = 328; maxcolc = 40;\r
 504         } else {\r
 505                 maxw = 264; maxcolc = 32;\r
 506         }\r
 507 \r
 508         // horizontal window?\r
 509         if ((win=pvid->reg[0x12]))\r
 510         {\r
 511                 hvwin=1; // hwindow shares display with plane A\r
 512                 edge=win&0x1f;\r
 513                 if(win == 0x80) {\r
 514                         // fullscreen window\r
 515                         hvwin=4;\r
 516                 } else if(win < 0x80) {\r
 517                         // window on the top\r
 518                              if(edge <= START_ROW) hvwin=0; // window not visible in our drawing region\r
 519                         else if(edge >= END_ROW)   hvwin=4;\r
 520                         else planestart = winend = edge;\r
 521                 } else if(win > 0x80) {\r
 522                         // window at the bottom\r
 523                         if(edge >= END_ROW) hvwin=0;\r
 524                         else planeend = winstart = edge;\r
 525                 }\r
 526         }\r
 527 \r
 528         // check for vertical window, but only if win is not fullscreen\r
 529         if (hvwin != 4)\r
 530         {\r
 531                 win=pvid->reg[0x11];\r
 532                 edge=win&0x1f;\r
 533                 if (win&0x80) {\r
 534                         if(!edge) hvwin=4;\r
 535                         else if(edge < (maxcolc>>1)) {\r
 536                                 // window is on the right\r
 537                                 hvwin|=2;\r
 538                                 planeend|=edge<<17;\r
 539                                 winstart|=edge<<17;\r
 540                                 winend|=maxcolc<<16;\r
 541                         }\r
 542                 } else {\r
 543                         if(edge >= (maxcolc>>1)) hvwin=4;\r
 544                         else if(edge) {\r
 545                                 // window is on the left\r
 546                                 hvwin|=2;\r
 547                                 winend|=edge<<17;\r
 548                                 planestart|=edge<<17;\r
 549                                 planeend|=maxcolc<<16;\r
 550                         }\r
 551                 }\r
 552         }\r
 553 \r
 554         if (hvwin==1) { winend|=maxcolc<<16; planeend|=maxcolc<<16; }\r
 555 \r
 556         HighCache2A[1] = HighCache2B[1] = 0;\r
 557         if (PicoDrawMask & PDRAW_LAYERB_ON)\r
 558                 DrawLayerFull(1, HighCache2B, START_ROW, (maxcolc<<16)|END_ROW);\r
 559         if (PicoDrawMask & PDRAW_LAYERA_ON) switch (hvwin)\r
 560         {\r
 561                 case 4:\r
 562                 // fullscreen window\r
 563                 DrawWindowFull(START_ROW, (maxcolc<<16)|END_ROW, 0);\r
 564                 break;\r
 565 \r
 566                 case 3:\r
 567                 // we have plane A and both v and h windows\r
 568                 DrawLayerFull(0, HighCache2A, planestart, planeend);\r
 569                 DrawWindowFull( winstart&~0xff0000, (winend&~0xff0000)|(maxcolc<<16), 0); // h\r
 570                 DrawWindowFull((winstart&~0xff)|START_ROW, (winend&~0xff)|END_ROW, 0);    // v\r
 571                 break;\r
 572 \r
 573                 case 2:\r
 574                 case 1:\r
 575                 // both window and plane A visible, window is vertical XOR horizontal\r
 576                 DrawLayerFull(0, HighCache2A, planestart, planeend);\r
 577                 DrawWindowFull(winstart, winend, 0);\r
 578                 break;\r
 579 \r
 580                 default:\r
 581                 // fullscreen plane A\r
 582                 DrawLayerFull(0, HighCache2A, START_ROW, (maxcolc<<16)|END_ROW);\r
 583                 break;\r
 584         }\r
 585         if (PicoDrawMask & PDRAW_SPRITES_LOW_ON)\r
 586                 DrawAllSpritesFull(0, maxw);\r
 587 \r
 588         if (HighCache2B[1]) DrawTilesFromCacheF(HighCache2B);\r
 589         if (HighCache2A[1]) DrawTilesFromCacheF(HighCache2A);\r
 590         if (PicoDrawMask & PDRAW_LAYERA_ON) switch (hvwin)\r
 591         {\r
 592                 case 4:\r
 593                 // fullscreen window\r
 594                 DrawWindowFull(START_ROW, (maxcolc<<16)|END_ROW, 1);\r
 595                 break;\r
 596 \r
 597                 case 3:\r
 598                 // we have plane A and both v and h windows\r
 599                 DrawWindowFull( winstart&~0xff0000, (winend&~0xff0000)|(maxcolc<<16), 1); // h\r
 600                 DrawWindowFull((winstart&~0xff)|START_ROW, (winend&~0xff)|END_ROW, 1);    // v\r
 601                 break;\r
 602 \r
 603                 case 2:\r
 604                 case 1:\r
 605                 // both window and plane A visible, window is vertical XOR horizontal\r
 606                 DrawWindowFull(winstart, winend, 1);\r
 607                 break;\r
 608         }\r
 609         if (PicoDrawMask & PDRAW_SPRITES_HI_ON)\r
 610                 DrawAllSpritesFull(1, maxw);\r
 611 }\r
 612 \r
 613 \r
 614 PICO_INTERNAL void PicoFrameFull()\r
 615 {\r
 616         // prepare cram?\r
 617         if (PicoPrepareCram) PicoPrepareCram();\r
 618 \r
 619         // Draw screen:\r
 620         BackFillFull(Pico.video.reg[7]);\r
 621         if (Pico.video.reg[1]&0x40) DrawDisplayFull();\r
 622 }\r
 623 \r