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