apps/plugins/doom/r_draw.c

   1 /* Emacs style mode select   -*- C++ -*-
   2  *-----------------------------------------------------------------------------
   3  *
   4  *
   5  *  PrBoom a Doom port merged with LxDoom and LSDLDoom
   6  *  based on BOOM, a modified and improved DOOM engine
   7  *  Copyright (C) 1999 by
   8  *  id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
   9  *  Copyright (C) 1999-2000 by
  10  *  Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze
  11  *
  12  *  This program is free software; you can redistribute it and/or
  13  *  modify it under the terms of the GNU General Public License
  14  *  as published by the Free Software Foundation; either version 2
  15  *  of the License, or (at your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; if not, write to the Free Software
  24  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  25  *  02111-1307, USA.
  26  *
  27  * DESCRIPTION:
  28  *      The actual span/column drawing functions.
  29  *      Here find the main potential for optimization,
  30  *       e.g. inline assembly, different algorithms.
  31  *
  32  *-----------------------------------------------------------------------------*/
  33
  34 #include "doomstat.h"
  35 #include "w_wad.h"
  36 #include "r_main.h"
  37 #include "v_video.h"
  38 #include "st_stuff.h"
  39 #include "g_game.h"
  40 #include "am_map.h"
  41 //#include "lprintf.h"
  42 #include "rockmacros.h"
  43
  44 //
  45 // All drawing to the view buffer is accomplished in this file.
  46 // The other refresh files only know about ccordinates,
  47 //  not the architecture of the frame buffer.
  48 // Conveniently, the frame buffer is a linear one,
  49 //  and we need only the base address,
  50 //  and the total size == width*height*depth/8.,
  51 //
  52
  53 //byte*  viewimage;
  54 int  viewwidth;
  55 int  scaledviewwidth;
  56 int  viewheight;
  57 int  viewwindowx;
  58 int  viewwindowy;
  59
  60 byte *topleft IBSS_ATTR;
  61
  62 // Color tables for different players,
  63 //  translate a limited part to another
  64 //  (color ramps used for  suit colors).
  65 //
  66
  67 // CPhipps - made const*'s
  68 const byte *tranmap IBSS_ATTR;          // translucency filter maps 256x256   // phares
  69 const byte *main_tranmap IBSS_ATTR;     // killough 4/11/98
  70
  71 //
  72 // R_DrawColumn
  73 // Source is the top of the column to scale.
  74 //
  75
  76 lighttable_t *dc_colormap IBSS_ATTR;
  77 int     dc_x IBSS_ATTR;
  78 int     dc_yl IBSS_ATTR;
  79 int     dc_yh IBSS_ATTR;
  80 fixed_t dc_iscale IBSS_ATTR;
  81 fixed_t dc_texturemid IBSS_ATTR;
  82 int     dc_texheight IBSS_ATTR;    // killough
  83 const byte    *dc_source IBSS_ATTR;      // first pixel in a column (possibly virtual)
  84
  85
  86 //
  87 // A column is a vertical slice/span from a wall texture that,
  88 //  given the DOOM style restrictions on the view orientation,
  89 //  will always have constant z depth.
  90 // Thus a special case loop for very fast rendering can
  91 //  be used. It has also been used with Wolfenstein 3D.
  92 //
  93 void R_DrawColumn (void)
  94 {
  95    int              count;
  96    register byte    *dest;            // killough
  97    register fixed_t frac;            // killough
  98
  99    // leban 1/17/99:
 100    // removed the + 1 here, adjusted the if test, and added an increment
 101    // later.  this helps a compiler pipeline a bit better.  the x86
 102    // assembler also does this.
 103    count = dc_yh - dc_yl;
 104
 105    // Zero length, column does not exceed a pixel.
 106    if (count < 0)
 107       return;
 108
 109 #ifdef RANGECHECK
 110
 111    if ((unsigned)dc_x >= SCREENWIDTH
 112          || dc_yl < 0
 113          || dc_yh >= SCREENHEIGHT)
 114       I_Error ("R_DrawColumn: %d to %d at %d", dc_yl, dc_yh, dc_x);
 115 #endif
 116
 117    count++;
 118
 119    // Framebuffer destination address.
 120    dest = topleft + dc_yl*SCREENWIDTH + dc_x;
 121
 122    // Determine scaling,
 123    // which is the only mapping to be done.
 124 #define  fracstep dc_iscale
 125
 126    frac = dc_texturemid + (dc_yl-centery)*fracstep;
 127
 128    // Inner loop that does the actual texture mapping,
 129    //  e.g. a DDA-lile scaling.
 130    // This is as fast as it gets.       (Yeah, right!!! -- killough)
 131    //
 132    // killough 2/1/98: more performance tuning
 133
 134    if (dc_texheight == 128)
 135    {
 136       while(count--)
 137       {
 138          *dest = dc_colormap[dc_source[(frac>>FRACBITS)&127]];
 139          frac += fracstep;
 140          dest += SCREENWIDTH;
 141       }
 142    }
 143    else if (dc_texheight == 0)
 144    {
 145       /* cph - another special case */
 146       while (count--)
 147       {
 148          *dest = dc_colormap[dc_source[frac>>FRACBITS]];
 149          frac += fracstep;
 150          dest += SCREENWIDTH;
 151       }
 152    }
 153    else
 154    {
 155       register unsigned heightmask = dc_texheight-1; // CPhipps - specify type
 156       if (! (dc_texheight & heightmask) )   // power of 2 -- killough
 157       {
 158          while (count>0)   // texture height is a power of 2 -- killough
 159          {
 160             *dest = dc_colormap[dc_source[(frac>>FRACBITS) & heightmask]];
 161             dest += SCREENWIDTH;
 162             frac += fracstep;
 163             count--;
 164          }
 165       }
 166       else
 167       {
 168          heightmask++;
 169          heightmask <<= FRACBITS;
 170
 171          if (frac < 0)
 172             while ((frac += heightmask) <  0)
 173                ;
 174          else
 175             while (frac >= (int)heightmask)
 176                frac -= heightmask;
 177
 178          while(count>0)
 179          {
 180             // Re-map color indices from wall texture column
 181             //  using a lighting/special effects LUT.
 182
 183             // heightmask is the Tutti-Frutti fix -- killough
 184
 185             *dest = dc_colormap[dc_source[frac>>FRACBITS]];
 186             dest += SCREENWIDTH;
 187             if ((frac += fracstep) >= (int)heightmask)
 188                frac -= heightmask;
 189             count--;
 190          }
 191       }
 192    }
 193 }
 194 #undef fracstep
 195
 196 // Here is the version of R_DrawColumn that deals with translucent  // phares
 197 // textures and sprites. It's identical to R_DrawColumn except      //    |
 198 // for the spot where the color index is stuffed into *dest. At     //    V
 199 // that point, the existing color index and the new color index
 200 // are mapped through the TRANMAP lump filters to get a new color
 201 // index whose RGB values are the average of the existing and new
 202 // colors.
 203 //
 204 // Since we're concerned about performance, the 'translucent or
 205 // opaque' decision is made outside this routine, not down where the
 206 // actual code differences are.
 207
 208 void R_DrawTLColumn (void)
 209 {
 210    int              count;
 211    register byte    *dest;           // killough
 212    register fixed_t frac;            // killough
 213
 214    count = dc_yh - dc_yl + 1;
 215
 216    // Zero length, column does not exceed a pixel.
 217    if (count <= 0)
 218       return;
 219
 220 #ifdef RANGECHECK
 221
 222    if ((unsigned)dc_x >= (unsigned)SCREENWIDTH
 223          || dc_yl < 0
 224          || dc_yh >= SCREENHEIGHT)
 225       I_Error("R_DrawTLColumn: %i to %i at %i", dc_yl, dc_yh, dc_x);
 226 #endif
 227
 228    // Framebuffer destination address.
 229    dest = topleft + dc_yl*SCREENWIDTH + dc_x;
 230
 231    // Determine scaling,
 232    //  which is the only mapping to be done.
 233 #define  fracstep dc_iscale
 234
 235    frac = dc_texturemid + (dc_yl-centery)*fracstep;
 236
 237    // Inner loop that does the actual texture mapping,
 238    //  e.g. a DDA-lile scaling.
 239    // This is as fast as it gets.       (Yeah, right!!! -- killough)
 240    //
 241    // killough 2/1/98, 2/21/98: more performance tuning
 242
 243    {
 244       register const byte *source = dc_source;
 245       register const lighttable_t *colormap = dc_colormap;
 246       register unsigned heightmask = dc_texheight-1; // CPhipps - specify type
 247       if (dc_texheight & heightmask)   // not a power of 2 -- killough
 248       {
 249          heightmask++;
 250          heightmask <<= FRACBITS;
 251
 252          if (frac < 0)
 253             while ((frac += heightmask) <  0)
 254                ;
 255          else
 256             while (frac >= (int)heightmask)
 257                frac -= heightmask;
 258
 259          do
 260          {
 261             // Re-map color indices from wall texture column
 262             //  using a lighting/special effects LUT.
 263
 264             // heightmask is the Tutti-Frutti fix -- killough
 265
 266             *dest = tranmap[(*dest<<8)+colormap[source[frac>>FRACBITS]]]; // phares
 267             dest += SCREENWIDTH;
 268             if ((frac += fracstep) >= (int)heightmask)
 269                frac -= heightmask;
 270          }
 271          while (--count);
 272       }
 273       else
 274       {
 275          while ((count-=2)>=0)   // texture height is a power of 2 -- killough
 276          {
 277             *dest = tranmap[(*dest<<8)+colormap[source[(frac>>FRACBITS) & heightmask]]]; // phares
 278             dest += SCREENWIDTH;
 279             frac += fracstep;
 280             *dest = tranmap[(*dest<<8)+colormap[source[(frac>>FRACBITS) & heightmask]]]; // phares
 281             dest += SCREENWIDTH;
 282             frac += fracstep;
 283          }
 284          if (count & 1)
 285             *dest = tranmap[(*dest<<8)+colormap[source[(frac>>FRACBITS) & heightmask]]]; // phares
 286       }
 287    }
 288 }
 289 #undef fracstep
 290
 291 //
 292 // Spectre/Invisibility.
 293 //
 294
 295 #define FUZZTABLE 50
 296 // proff 08/17/98: Changed for high-res
 297 //#define FUZZOFF (SCREENWIDTH)
 298 #define FUZZOFF 1
 299
 300 static const int fuzzoffset_org[FUZZTABLE] ICONST_ATTR = {
 301          FUZZOFF,-FUZZOFF,FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,
 302          FUZZOFF,FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,
 303          FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,-FUZZOFF,-FUZZOFF,-FUZZOFF,
 304          FUZZOFF,-FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,
 305          FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,-FUZZOFF,FUZZOFF,
 306          FUZZOFF,-FUZZOFF,-FUZZOFF,-FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,
 307          FUZZOFF,FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,FUZZOFF
 308       } ;
 309
 310 static int fuzzoffset[FUZZTABLE] IBSS_ATTR;
 311
 312 static int fuzzpos IBSS_ATTR = 0;
 313
 314 //
 315 // Framebuffer postprocessing.
 316 // Creates a fuzzy image by copying pixels
 317 //  from adjacent ones to left and right.
 318 // Used with an all black colormap, this
 319 //  could create the SHADOW effect,
 320 //  i.e. spectres and invisible players.
 321 //
 322
 323 void R_DrawFuzzColumn(void)
 324 {
 325    int      count;
 326    byte     *dest;
 327    fixed_t  frac;
 328    fixed_t  fracstep;
 329
 330    // Adjust borders. Low...
 331    if (!dc_yl)
 332       dc_yl = 1;
 333
 334    // .. and high.
 335    if (dc_yh == viewheight-1)
 336       dc_yh = viewheight - 2;
 337
 338    count = dc_yh - dc_yl;
 339
 340    // Zero length.
 341    if (count < 0)
 342       return;
 343
 344 #ifdef RANGECHECK
 345
 346    if ((unsigned) dc_x >= (unsigned)SCREENWIDTH
 347          || dc_yl < 0
 348          || (unsigned)dc_yh >= (unsigned)SCREENHEIGHT)
 349       I_Error("R_DrawFuzzColumn: %i to %i at %i", dc_yl, dc_yh, dc_x);
 350 #endif
 351
 352    // Keep till detailshift bug in blocky mode fixed,
 353    //  or blocky mode removed.
 354
 355    // Does not work with blocky mode.
 356    dest = topleft + dc_yl*SCREENWIDTH + dc_x;
 357
 358    // Looks familiar.
 359    fracstep = dc_iscale;
 360    frac = dc_texturemid + (dc_yl-centery)*fracstep;
 361
 362    // Looks like an attempt at dithering,
 363    // using the colormap #6 (of 0-31, a bit brighter than average).
 364
 365    do
 366    {
 367       // Lookup framebuffer, and retrieve
 368       //  a pixel that is either one column
 369       //  left or right of the current one.
 370       // Add index from colormap to index.
 371       // killough 3/20/98: use fullcolormap instead of colormaps
 372
 373       *dest = fullcolormap[6*256+dest[fuzzoffset[fuzzpos]]];
 374
 375       // Some varying invisibility effects can be gotten by playing // phares
 376       // with this logic. For example, try                          // phares
 377       //                                                            // phares
 378       //    *dest = fullcolormap[0*256+dest[FUZZOFF]];              // phares
 379
 380       // Clamp table lookup index.
 381       if (++fuzzpos == FUZZTABLE)
 382          fuzzpos = 0;
 383
 384       dest += SCREENWIDTH;
 385
 386       frac += fracstep;
 387    }
 388    while (count--);
 389 }
 390
 391 //
 392 // R_DrawTranslatedColumn
 393 // Used to draw player sprites
 394 //  with the green colorramp mapped to others.
 395 // Could be used with different translation
 396 //  tables, e.g. the lighter colored version
 397 //  of the BaronOfHell, the HellKnight, uses
 398 //  identical sprites, kinda brightened up.
 399 //
 400
 401 byte *dc_translation, *translationtables;
 402
 403 void R_DrawTranslatedColumn (void)
 404 {
 405    int      count;
 406    byte     *dest;
 407    fixed_t  frac;
 408    fixed_t  fracstep;
 409
 410    count = dc_yh - dc_yl;
 411    if (count < 0)
 412       return;
 413
 414 #ifdef RANGECHECK
 415
 416    if ((unsigned)dc_x >= (unsigned)SCREENWIDTH
 417          || dc_yl < 0
 418          || (unsigned)dc_yh >= (unsigned)SCREENHEIGHT)
 419       I_Error("R_DrawColumn: %i to %i at %i", dc_yl, dc_yh, dc_x);
 420 #endif
 421
 422    // FIXME. As above.
 423    dest = topleft + dc_yl*SCREENWIDTH + dc_x;
 424
 425    // Looks familiar.
 426    fracstep = dc_iscale;
 427    frac = dc_texturemid + (dc_yl-centery)*fracstep;
 428
 429    // Here we do an additional index re-mapping.
 430    do
 431    {
 432       // Translation tables are used
 433       //  to map certain colorramps to other ones,
 434       //  used with PLAY sprites.
 435       // Thus the "green" ramp of the player 0 sprite
 436       //  is mapped to gray, red, black/indigo.
 437
 438       *dest = dc_colormap[dc_translation[dc_source[frac>>FRACBITS]]];
 439       dest += SCREENWIDTH;
 440
 441       frac += fracstep;
 442    }
 443    while (count--);
 444 }
 445
 446 //
 447 // R_InitTranslationTables
 448 // Creates the translation tables to map
 449 //  the green color ramp to gray, brown, red.
 450 // Assumes a given structure of the PLAYPAL.
 451 // Could be read from a lump instead.
 452 //
 453
 454 byte playernumtotrans[MAXPLAYERS];
 455 extern lighttable_t *(*c_zlight)[LIGHTLEVELS][MAXLIGHTZ];
 456
 457 void R_InitTranslationTables (void)
 458 {
 459    int i, j;
 460 #define MAXTRANS 3
 461
 462    byte transtocolour[MAXTRANS];
 463
 464    // killough 5/2/98:
 465    // Remove dependency of colormaps aligned on 256-byte boundary
 466
 467    if (translationtables == NULL) // CPhipps - allow multiple calls
 468       translationtables = Z_Malloc(256*MAXTRANS, PU_STATIC, 0);
 469
 470    for (i=0; i<MAXTRANS; i++)
 471       transtocolour[i] = 255;
 472
 473    for (i=0; i<MAXPLAYERS; i++)
 474    {
 475       byte wantcolour = mapcolor_plyr[i];
 476       playernumtotrans[i] = 0;
 477       if (wantcolour != 0x70) // Not green, would like translation
 478          for (j=0; j<MAXTRANS; j++)
 479             if (transtocolour[j] == 255)
 480             {
 481                transtocolour[j] = wantcolour;
 482                playernumtotrans[i] = j+1;
 483                break;
 484             }
 485    }
 486
 487    // translate just the 16 green colors
 488    for (i=0; i<256; i++)
 489       if (i >= 0x70 && i<= 0x7f)
 490       {
 491          // CPhipps - configurable player colours
 492          translationtables[i] = colormaps[0][((i&0xf)<<9) + transtocolour[0]];
 493          translationtables[i+256] = colormaps[0][((i&0xf)<<9) + transtocolour[1]];
 494          translationtables[i+512] = colormaps[0][((i&0xf)<<9) + transtocolour[2]];
 495       }
 496       else  // Keep all other colors as is.
 497          translationtables[i]=translationtables[i+256]=translationtables[i+512]=i;
 498 }
 499
 500 //
 501 // R_DrawSpan
 502 // With DOOM style restrictions on view orientation,
 503 //  the floors and ceilings consist of horizontal slices
 504 //  or spans with constant z depth.
 505 // However, rotation around the world z axis is possible,
 506 //  thus this mapping, while simpler and faster than
 507 //  perspective correct texture mapping, has to traverse
 508 //  the texture at an angle in all but a few cases.
 509 // In consequence, flats are not stored by column (like walls),
 510 //  and the inner loop has to step in texture space u and v.
 511 //
 512
 513 int  ds_y IBSS_ATTR;
 514 int  ds_x1 IBSS_ATTR;
 515 int  ds_x2 IBSS_ATTR;
 516
 517 lighttable_t *ds_colormap IBSS_ATTR;
 518
 519 fixed_t ds_xfrac IBSS_ATTR;
 520 fixed_t ds_yfrac IBSS_ATTR;
 521 fixed_t ds_xstep IBSS_ATTR;
 522 fixed_t ds_ystep IBSS_ATTR;
 523
 524 // start of a 64*64 tile image
 525 byte *ds_source IBSS_ATTR;
 526
 527 void R_DrawSpan (void)
 528 {
 529 #ifdef CPU_COLDFIRE
 530    // only slightly faster
 531    asm volatile (
 532       "tst %[count]                             \n"
 533       "beq endspanloop                          \n"
 534       "clr.l %%d4                               \n"
 535       "spanloop:                                \n"
 536       "move.l %[xfrac], %%d1                    \n"
 537       "swap %%d1                                \n"
 538       "and.l #63,%%d1                           \n"
 539       "move.l %[yfrac], %%d2                    \n"
 540       "lsr.l %[ten],%%d2                        \n"
 541       "and.l #4032,%%d2                         \n"
 542       "or.l %%d2, %%d1                          \n"
 543       "move.b (%[source], %%d1), %%d4           \n"
 544       "add.l %[ds_xstep], %[xfrac]              \n"
 545       "add.l %[ds_ystep], %[yfrac]              \n"
 546       "move.b (%[colormap],%%d4.l), (%[dest])+  \n"
 547       "subq.l #1, %[count]                      \n"
 548       "bne spanloop                             \n"
 549       "endspanloop:                             \n"
 550    : /* outputs */
 551    : /* inputs */
 552       [ten] "d"(10),
 553       [count] "d" (ds_x2-ds_x1+1),
 554       [xfrac] "a" (ds_xfrac),
 555       [yfrac] "a" (ds_yfrac),
 556       [source] "a" (ds_source),
 557       [colormap] "a" (ds_colormap),
 558       [dest] "a" (topleft+ds_y*SCREENWIDTH +ds_x1),
 559       [ds_xstep] "d" (ds_xstep),
 560       [ds_ystep] "d" (ds_ystep)
 561    : /* clobbers */
 562       "d1", "d2", "d4"
 563    );
 564 #else
 565    register unsigned count = ds_x2 - ds_x1 + 1,xfrac = ds_xfrac,yfrac = ds_yfrac;
 566
 567    register byte *source = ds_source;
 568    register byte *colormap = ds_colormap;
 569    register byte *dest = topleft + ds_y*SCREENWIDTH + ds_x1;
 570
 571    while (count)
 572    {
 573       register unsigned xtemp = xfrac >> 16;
 574       register unsigned ytemp = yfrac >> 10;
 575       register unsigned spot;
 576       ytemp &= 4032;
 577       xtemp &= 63;
 578       spot = xtemp | ytemp;
 579       xfrac += ds_xstep;
 580       yfrac += ds_ystep;
 581       *dest++ = colormap[source[spot]];
 582       count--;
 583    }
 584 #endif
 585 }
 586
 587 //
 588 // R_InitBuffer
 589 // Creats lookup tables that avoid
 590 //  multiplies and other hazzles
 591 //  for getting the framebuffer address
 592 //  of a pixel to draw.
 593 //
 594
 595 void R_InitBuffer(int width, int height)
 596 {
 597    int i=0;
 598    // Handle resize,
 599    //  e.g. smaller view windows
 600    //  with border and/or status bar.
 601
 602    viewwindowx = (SCREENWIDTH-width) >> 1;
 603
 604    // Same with base row offset.
 605
 606    viewwindowy = width==SCREENWIDTH ? 0 : (SCREENHEIGHT-(ST_SCALED_HEIGHT-1)-height)>>1;
 607
 608    topleft = d_screens[0] + viewwindowy*SCREENWIDTH + viewwindowx;
 609
 610    // Preclaculate all row offsets.
 611    // CPhipps - merge viewwindowx into here
 612    for (i=0; i<FUZZTABLE; i++)
 613       fuzzoffset[i] = fuzzoffset_org[i]*SCREENWIDTH;
 614 }
 615
 616
 617 //
 618 // R_FillBackScreen
 619 // Fills the back screen with a pattern
 620 //  for variable screen sizes
 621 // Also draws a beveled edge.
 622 //
 623 // CPhipps - patch drawing updated
 624
 625 void R_FillBackScreen (void)
 626 {
 627    int     x,y;
 628
 629    if (scaledviewwidth == SCREENWIDTH)
 630       return;
 631
 632    V_DrawBackground(gamemode == commercial ? "GRNROCK" : "FLOOR7_2", 1);
 633
 634    for (x=0 ; x<scaledviewwidth ; x+=8)
 635       V_DrawNamePatch(viewwindowx+x,viewwindowy-8,1,"brdr_t", CR_DEFAULT, VPT_NONE);
 636
 637    for (x=0 ; x<scaledviewwidth ; x+=8)
 638       V_DrawNamePatch(viewwindowx+x,viewwindowy+viewheight,1,"brdr_b", CR_DEFAULT, VPT_NONE);
 639
 640    for (y=0 ; y<viewheight ; y+=8)
 641       V_DrawNamePatch(viewwindowx-8,viewwindowy+y,1,"brdr_l", CR_DEFAULT, VPT_NONE);
 642
 643    for (y=0 ; y<viewheight ; y+=8)
 644       V_DrawNamePatch(viewwindowx+scaledviewwidth,viewwindowy+y,1,"brdr_r", CR_DEFAULT, VPT_NONE);
 645
 646    // Draw beveled edge.
 647    V_DrawNamePatch(viewwindowx-8,viewwindowy-8,1,"brdr_tl", CR_DEFAULT, VPT_NONE);
 648
 649    V_DrawNamePatch(viewwindowx+scaledviewwidth,viewwindowy-8,1,"brdr_tr", CR_DEFAULT, VPT_NONE);
 650
 651    V_DrawNamePatch(viewwindowx-8,viewwindowy+viewheight,1,"brdr_bl", CR_DEFAULT, VPT_NONE);
 652
 653    V_DrawNamePatch(viewwindowx+scaledviewwidth,viewwindowy+viewheight,1,"brdr_br", CR_DEFAULT, VPT_NONE);
 654 }
 655
 656 //
 657 // Copy a screen buffer.
 658 //
 659
 660 void R_VideoErase(unsigned ofs, int count)
 661 {
 662    memcpy(d_screens[0]+ofs, d_screens[1]+ofs, count);   // LFB copy.
 663 }
 664
 665 //
 666 // R_DrawViewBorder
 667 // Draws the border around the view
 668 //  for different size windows?
 669 //
 670
 671 void R_DrawViewBorder(void)
 672 {
 673    int top, side, ofs, i;
 674    // proff/nicolas 09/20/98: Added for high-res (inspired by DosDOOM)
 675    int side2;
 676
 677    // proff/nicolas 09/20/98: Removed for high-res
 678    //  if (scaledviewwidth == SCREENWIDTH)
 679    //  return;
 680
 681    // proff/nicolas 09/20/98: Added for high-res (inspired by DosDOOM)
 682    if ((SCREENHEIGHT != viewheight) ||
 683          ((automapmode & am_active) && ! (automapmode & am_overlay)))
 684    {
 685       ofs = ( SCREENHEIGHT - ST_SCALED_HEIGHT ) * SCREENWIDTH;
 686       side= ( SCREENWIDTH - ST_SCALED_WIDTH ) / 2;
 687       side2 = side * 2;
 688
 689       R_VideoErase ( ofs, side );
 690
 691       ofs += ( SCREENWIDTH - side );
 692       for ( i = 1; i < ST_SCALED_HEIGHT; i++ )
 693       {
 694          R_VideoErase ( ofs, side2 );
 695          ofs += SCREENWIDTH;
 696       }
 697
 698       R_VideoErase ( ofs, side );
 699    }
 700
 701    if ( viewheight >= ( SCREENHEIGHT - ST_SCALED_HEIGHT ))
 702       return; // if high-res, don't go any further!
 703
 704    top = ((SCREENHEIGHT-ST_SCALED_HEIGHT)-viewheight)/2;
 705    side = (SCREENWIDTH-scaledviewwidth)/2;
 706
 707    // copy top and one line of left side
 708    R_VideoErase (0, top*SCREENWIDTH+side);
 709
 710    // copy one line of right side and bottom
 711    ofs = (viewheight+top)*SCREENWIDTH-side;
 712    R_VideoErase (ofs, top*SCREENWIDTH+side);
 713
 714    // copy sides using wraparound
 715    ofs = top*SCREENWIDTH + SCREENWIDTH-side;
 716    side <<= 1;
 717
 718    for (i=1 ; i<viewheight ; i++)
 719    {
 720       R_VideoErase (ofs, side);
 721       ofs += SCREENWIDTH;
 722    }
 723 }