Games/Doom/v_video.c

   1 // Emacs style mode select   -*- C++ -*-
   2 //-----------------------------------------------------------------------------
   3 //
   4 // $Id$
   5 //
   6 // Copyright (C) 1993-1996 by id Software, Inc.
   7 //
   8 // This source is available for distribution and/or modification
   9 // only under the terms of the DOOM Source Code License as
  10 // published by id Software. All rights reserved.
  11 //
  12 // The source is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
  15 // for more details.
  16 //
  17 // $Log$
  18 // Revision 1.1  2000/02/29 18:21:05  stegerg
  19 // Doom port based on ADoomPPC. Read README.AROS!
  20 //
  21 //
  22 // DESCRIPTION:
  23 //      Gamma correction LUT stuff.
  24 //      Functions to draw patches (by post) directly to screen.
  25 //      Functions to blit a block to the screen.
  26 //
  27 //-----------------------------------------------------------------------------
  28
  29 static const char
  30 rcsid[] = "$Id$";
  31
  32 #include <exec/exec.h>
  33
  34 #ifdef AROS
  35  #define MEMF_NOCACHESYNCPPC            0
  36  #define MEMF_NOCACHESYNCM68K           0
  37  #define PPCAllocVec(size,flags)        I_AllocLow(size)
  38 #else
  39   #include <powerup/clib/ppc_protos.h>
  40   #include <powerup/ppclib/memory.h>
  41 #endif
  42
  43 #include "i_system.h"
  44 #include "i_video.h"
  45 #include "r_local.h"
  46
  47 #include "doomdef.h"
  48 #include "doomstat.h"
  49 #include "doomdata.h"
  50
  51 #include "m_bbox.h"
  52 #include "m_swap.h"
  53 #include "m_argv.h"
  54 #include "am_map.h"
  55 #include "r_draw.h"
  56
  57 #include "v_video.h"
  58
  59 #include "st_stuff.h"
  60
  61 extern int weirdaspect;
  62
  63 // Screen buffer memory
  64 byte *vid_mem;
  65
  66 // Each screen is [SCREENWIDTH*SCREENHEIGHT];
  67 byte* screens[5];
  68
  69 int dirtybox[4];
  70
  71
  72
  73 // Now where did these came from?
  74 byte gammatable[5][256] =
  75 {
  76     {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,
  77      17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,
  78      33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,
  79      49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,
  80      65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,
  81      81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,
  82      97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,
  83      113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,
  84      128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,
  85      144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,
  86      160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,
  87      176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,
  88      192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,
  89      208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,
  90      224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,
  91      240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255},
  92
  93     {2,4,5,7,8,10,11,12,14,15,16,18,19,20,21,23,24,25,26,27,29,30,31,
  94      32,33,34,36,37,38,39,40,41,42,44,45,46,47,48,49,50,51,52,54,55,
  95      56,57,58,59,60,61,62,63,64,65,66,67,69,70,71,72,73,74,75,76,77,
  96      78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,
  97      99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,
  98      115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,129,
  99      130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,
 100      146,147,148,148,149,150,151,152,153,154,155,156,157,158,159,160,
 101      161,162,163,163,164,165,166,167,168,169,170,171,172,173,174,175,
 102      175,176,177,178,179,180,181,182,183,184,185,186,186,187,188,189,
 103      190,191,192,193,194,195,196,196,197,198,199,200,201,202,203,204,
 104      205,205,206,207,208,209,210,211,212,213,214,214,215,216,217,218,
 105      219,220,221,222,222,223,224,225,226,227,228,229,230,230,231,232,
 106      233,234,235,236,237,237,238,239,240,241,242,243,244,245,245,246,
 107      247,248,249,250,251,252,252,253,254,255},
 108
 109     {4,7,9,11,13,15,17,19,21,22,24,26,27,29,30,32,33,35,36,38,39,40,42,
 110      43,45,46,47,48,50,51,52,54,55,56,57,59,60,61,62,63,65,66,67,68,69,
 111      70,72,73,74,75,76,77,78,79,80,82,83,84,85,86,87,88,89,90,91,92,93,
 112      94,95,96,97,98,100,101,102,103,104,105,106,107,108,109,110,111,112,
 113      113,114,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,
 114      129,130,131,132,133,133,134,135,136,137,138,139,140,141,142,143,144,
 115      144,145,146,147,148,149,150,151,152,153,153,154,155,156,157,158,159,
 116      160,160,161,162,163,164,165,166,166,167,168,169,170,171,172,172,173,
 117      174,175,176,177,178,178,179,180,181,182,183,183,184,185,186,187,188,
 118      188,189,190,191,192,193,193,194,195,196,197,197,198,199,200,201,201,
 119      202,203,204,205,206,206,207,208,209,210,210,211,212,213,213,214,215,
 120      216,217,217,218,219,220,221,221,222,223,224,224,225,226,227,228,228,
 121      229,230,231,231,232,233,234,235,235,236,237,238,238,239,240,241,241,
 122      242,243,244,244,245,246,247,247,248,249,250,251,251,252,253,254,254,
 123      255},
 124
 125     {8,12,16,19,22,24,27,29,31,34,36,38,40,41,43,45,47,49,50,52,53,55,
 126      57,58,60,61,63,64,65,67,68,70,71,72,74,75,76,77,79,80,81,82,84,85,
 127      86,87,88,90,91,92,93,94,95,96,98,99,100,101,102,103,104,105,106,107,
 128      108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,
 129      125,126,127,128,129,130,131,132,133,134,135,135,136,137,138,139,140,
 130      141,142,143,143,144,145,146,147,148,149,150,150,151,152,153,154,155,
 131      155,156,157,158,159,160,160,161,162,163,164,165,165,166,167,168,169,
 132      169,170,171,172,173,173,174,175,176,176,177,178,179,180,180,181,182,
 133      183,183,184,185,186,186,187,188,189,189,190,191,192,192,193,194,195,
 134      195,196,197,197,198,199,200,200,201,202,202,203,204,205,205,206,207,
 135      207,208,209,210,210,211,212,212,213,214,214,215,216,216,217,218,219,
 136      219,220,221,221,222,223,223,224,225,225,226,227,227,228,229,229,230,
 137      231,231,232,233,233,234,235,235,236,237,237,238,238,239,240,240,241,
 138      242,242,243,244,244,245,246,246,247,247,248,249,249,250,251,251,252,
 139      253,253,254,254,255},
 140
 141     {16,23,28,32,36,39,42,45,48,50,53,55,57,60,62,64,66,68,69,71,73,75,76,
 142      78,80,81,83,84,86,87,89,90,92,93,94,96,97,98,100,101,102,103,105,106,
 143      107,108,109,110,112,113,114,115,116,117,118,119,120,121,122,123,124,
 144      125,126,128,128,129,130,131,132,133,134,135,136,137,138,139,140,141,
 145      142,143,143,144,145,146,147,148,149,150,150,151,152,153,154,155,155,
 146      156,157,158,159,159,160,161,162,163,163,164,165,166,166,167,168,169,
 147      169,170,171,172,172,173,174,175,175,176,177,177,178,179,180,180,181,
 148      182,182,183,184,184,185,186,187,187,188,189,189,190,191,191,192,193,
 149      193,194,195,195,196,196,197,198,198,199,200,200,201,202,202,203,203,
 150      204,205,205,206,207,207,208,208,209,210,210,211,211,212,213,213,214,
 151      214,215,216,216,217,217,218,219,219,220,220,221,221,222,223,223,224,
 152      224,225,225,226,227,227,228,228,229,229,230,230,231,232,232,233,233,
 153      234,234,235,235,236,236,237,237,238,239,239,240,240,241,241,242,242,
 154      243,243,244,244,245,245,246,246,247,247,248,248,249,249,250,250,251,
 155      251,252,252,253,254,254,255,255}
 156 };
 157
 158
 159
 160 int     usegamma;
 161
 162 //
 163 // V_MarkRect
 164 //
 165 /*
 166 void
 167 V_MarkRect
 168 ( int           x,
 169   int           y,
 170   int           width,
 171   int           height )
 172 {
 173     M_AddToBox (dirtybox, x, y);
 174     M_AddToBox (dirtybox, x+width-1, y+height-1);
 175 }
 176 */
 177
 178
 179 //
 180 // V_CopyRect
 181 //
 182 void
 183 V_CopyRect
 184 ( int           srcx,
 185   int           srcy,
 186   int           srcscrn,
 187   int           width,
 188   int           height,
 189   int           destx,
 190   int           desty,
 191   int           destscrn )
 192 {
 193     byte*       src;
 194     byte*       dest;
 195
 196 #ifdef RANGECHECK
 197     if (srcx<0
 198         ||srcx+width >SCREENWIDTH
 199         || srcy<0
 200         || srcy+height>SCREENHEIGHT
 201         ||destx<0||destx+width >SCREENWIDTH
 202         || desty<0
 203         || desty+height>SCREENHEIGHT
 204         || (unsigned)srcscrn>4
 205         || (unsigned)destscrn>4)
 206     {
 207         I_Error ("Bad V_CopyRect");
 208     }
 209 #endif
 210     src = screens[srcscrn]+SCREENWIDTH*srcy+srcx;
 211     dest = screens[destscrn]+SCREENWIDTH*desty+destx;
 212
 213     for ( ; height>0 ; height--)
 214     {
 215         memcpy (dest, src, width);
 216         src += SCREENWIDTH;
 217         dest += SCREENWIDTH;
 218     }
 219
 220     if (destscrn == 0)
 221         I_MarkRect (destx, desty, width, height);
 222 }
 223
 224
 225 //
 226 // V_DrawPatch
 227 // Masks a column based masked pic to the screen.
 228 //
 229 void
 230 V_DrawPatch
 231 ( int           x,
 232   int           y,
 233   int           scrn,
 234   patch_t*      patch )
 235 {
 236
 237     int         count;
 238     int         col;
 239     column_t*   column;
 240     byte*       desttop;
 241     byte*       dest;
 242     byte*       source;
 243     int         w;
 244     int         x0;
 245
 246     y -= SWAPSHORT(patch->topoffset);
 247     x -= SWAPSHORT(patch->leftoffset);
 248 #ifdef RANGECHECK
 249     if (x<0
 250         ||x+SWAPSHORT(patch->width) >SCREENWIDTH
 251         || y<0
 252         || y+SWAPSHORT(patch->height)>SCREENHEIGHT
 253         || (unsigned)scrn>4)
 254     {
 255       fprintf( stderr, "Patch at %d,%d exceeds LFB\n", x,y );
 256       // No I_Error abort - what is up with TNT.WAD?
 257       fprintf( stderr, "V_DrawPatch: bad patch (ignored)\n");
 258       return;
 259     }
 260 #endif
 261
 262     x0 = x;
 263     col = 0;
 264     desttop = screens[scrn]+y*SCREENWIDTH+x;
 265
 266     w = SWAPSHORT(patch->width);
 267
 268     for ( ; col<w ; x++, col++, desttop++)
 269     {
 270         column = (column_t *)((byte *)patch + SWAPLONG(patch->columnofs[col]));
 271
 272         // step through the posts in a column
 273         while (column->topdelta != 0xff )
 274         {
 275             source = (byte *)column + 3;
 276             dest = desttop + column->topdelta*SCREENWIDTH;
 277             count = column->length;
 278
 279             while (count--)
 280             {
 281                 *dest = *source++;
 282                 dest += SCREENWIDTH;
 283             }
 284             column = (column_t *)(  (byte *)column + column->length
 285                                     + 4 );
 286         }
 287     }
 288     if (scrn == 0)
 289         I_MarkRect (x0, y, SWAPSHORT(patch->width), SWAPSHORT(patch->height));
 290 }
 291
 292 //
 293 // V_DrawPatchFlipped
 294 // Masks a column based masked pic to the screen.
 295 // Flips horizontally, e.g. to mirror face.
 296 //
 297 void
 298 V_DrawPatchFlipped
 299 ( int           x,
 300   int           y,
 301   int           scrn,
 302   patch_t*      patch )
 303 {
 304
 305     int         count;
 306     int         col;
 307     column_t*   column;
 308     byte*       desttop;
 309     byte*       dest;
 310     byte*       source;
 311     int         w;
 312     int         x0;
 313
 314     y -= SWAPSHORT(patch->topoffset);
 315     x -= SWAPSHORT(patch->leftoffset);
 316 #ifdef RANGECHECK
 317     if (x<0
 318         ||x+SWAPSHORT(patch->width) >SCREENWIDTH
 319         || y<0
 320         || y+SWAPSHORT(patch->height)>SCREENHEIGHT
 321         || (unsigned)scrn>4)
 322     {
 323       fprintf( stderr, "Patch origin %d,%d exceeds LFB\n", x,y );
 324       I_Error ("Bad V_DrawPatch in V_DrawPatchFlipped");
 325     }
 326 #endif
 327
 328     x0 = x;
 329     col = 0;
 330     desttop = screens[scrn]+y*SCREENWIDTH+x;
 331
 332     w = SWAPSHORT(patch->width);
 333
 334     for ( ; col<w ; x++, col++, desttop++)
 335     {
 336         column = (column_t *)((byte *)patch + SWAPLONG(patch->columnofs[w-1-col]));
 337
 338         // step through the posts in a column
 339         while (column->topdelta != 0xff )
 340         {
 341             source = (byte *)column + 3;
 342             dest = desttop + column->topdelta*SCREENWIDTH;
 343             count = column->length;
 344
 345             while (count--)
 346             {
 347                 *dest = *source++;
 348                 dest += SCREENWIDTH;
 349             }
 350             column = (column_t *)(  (byte *)column + column->length
 351                                     + 4 );
 352         }
 353     }
 354     if (scrn == 0)
 355         I_MarkRect (x0, y, SWAPSHORT(patch->width), SWAPSHORT(patch->height));
 356 }
 357
 358
 359
 360 //
 361 // V_DrawPatchDirect
 362 // Draws directly to the screen on the pc.
 363 //
 364 void
 365 V_DrawPatchDirect
 366 ( int           x,
 367   int           y,
 368   int           scrn,
 369   patch_t*      patch )
 370 {
 371     V_DrawPatch (x,y,scrn, patch);
 372 }
 373
 374 void    //stretches bitmap to fill screen
 375 V_DrawPatchInDirect
 376 ( int           x,
 377   int           y,
 378   int           scrn,
 379   patch_t*      patch   )
 380 {
 381     int         count;
 382     int         col;
 383     column_t*   column;
 384     byte*       desttop;
 385     byte*       dest;
 386     byte*       source;
 387     int         w;
 388     int         x0;
 389
 390   int deltax,deltay,deltaxi,deltayi,stretchx,stretchy;
 391   int srccol,collen;
 392
 393   y -= SWAPSHORT(patch->topoffset);
 394   x -= SWAPSHORT(patch->leftoffset);
 395
 396 #ifdef RANGECHECK
 397   if (x<0
 398       ||x+SWAPSHORT(patch->width)>320
 399       || y<0
 400       || y+SWAPSHORT(patch->height)>200
 401       || (unsigned)scrn>4)
 402     {
 403         fprintf(        stderr, "Patch at %d,%d exceeds LFB\n", x,y );
 404         // No I_Error abort - what is up with TNT.WAD?
 405         fprintf(        stderr, "V_DrawPatch: bad patch (ignored)\n");
 406         return;
 407     }
 408 #endif
 409
 410   deltax=(SCREENWIDTH<<16)/320;
 411   deltaxi=(320<<16)/SCREENWIDTH;
 412   deltay=(SCREENHEIGHT<<16)/200;
 413   deltayi=(200<<16)/SCREENHEIGHT;
 414   stretchx=(x*deltax)>>16;
 415   stretchy=(y*deltay)>>16;
 416
 417   x0 = x;
 418   col = 0;
 419   desttop = screens[scrn]+stretchy*SCREENWIDTH+stretchx;
 420
 421   w = SWAPSHORT(patch->width)<<16;
 422
 423   for ( ; col < w; x++, col += deltaxi, desttop++) {
 424     column = (column_t *)((byte *)patch + SWAPLONG(patch->columnofs[col>>16]));
 425
 426     // step through the posts in a column
 427     while (column->topdelta != 0xff ) {
 428       source = (byte *)column + 3;
 429       dest = desttop+((column->topdelta*deltay)>>16)*SCREENWIDTH;
 430       collen = count = (column->length*deltay)>>16;
 431       srccol = 0;
 432       while (count--) {
 433         *dest = source[srccol>>16];
 434         dest += SCREENWIDTH;
 435         srccol += deltayi;
 436       }
 437       column = (column_t *)((byte *)column + (column->length)+4);
 438     }
 439   }
 440   if (scrn == 0)
 441       I_MarkRect (x0, y, SWAPSHORT(patch->width), SWAPSHORT(patch->height));
 442 }
 443
 444
 445 void    //stretches bitmap to fill screen
 446 V_DrawPatchInDirectFlipped
 447 ( int           x,
 448   int           y,
 449   int           scrn,
 450   patch_t*      patch   )
 451   {
 452   int           count;
 453   int           col;
 454   column_t*     column;
 455   byte* desttop;
 456   byte* dest;
 457   byte* source;
 458   int           w;
 459
 460   int deltax,deltay,deltaxi,deltayi,stretchx,stretchy;
 461   int srccol,collen;
 462
 463   y     -=      SWAPSHORT(patch->topoffset);
 464   x     -=      SWAPSHORT(patch->leftoffset);
 465 #ifdef RANGECHECK
 466   if (x<0
 467       ||x+SWAPSHORT(patch->width)       >320
 468       ||        y<0
 469       ||        y+SWAPSHORT(patch->height)>200
 470       ||        (unsigned)scrn>4)
 471   {
 472     fprintf(    stderr, "Patch at %d,%d exceeds LFB\n", x,y );
 473     // No I_Error abort - what is up with TNT.WAD?
 474     fprintf(    stderr, "V_DrawPatch: bad patch (ignored)\n");
 475     return;
 476   }
 477 #endif
 478
 479   deltax=(SCREENWIDTH<<16)/320;
 480   deltaxi=(320<<16)/SCREENWIDTH;
 481   deltay=(SCREENHEIGHT<<16)/200;
 482   deltayi=(200<<16)/SCREENHEIGHT;
 483   stretchx=(x*deltax)>>16;
 484   stretchy=(y*deltay)>>16;
 485
 486   col = 0;
 487   desttop       = screens[scrn]+stretchy*SCREENWIDTH+stretchx;
 488
 489   w = SWAPSHORT(patch->width)<<16;
 490
 491   for ( ; col < w; x++, col += deltaxi, desttop++) {
 492     column = (column_t *)((byte *)patch +
 493                SWAPLONG(patch->columnofs[SWAPSHORT(patch->width)-1-(col>>16)]));
 494
 495     // step through the posts in a column
 496     while (column->topdelta != 0xff) {
 497       source = (byte *)column + 3;
 498       dest = desttop+((column->topdelta*deltay)>>16)*SCREENWIDTH;
 499       collen = count = (column->length*deltay)>>16;
 500       srccol=0;
 501       while (count--) {
 502         *dest=source[srccol>>16];
 503         dest += SCREENWIDTH;
 504         srccol+=deltayi;
 505       }
 506       column = (column_t *)((byte *)column+(column->length)+4);
 507     }
 508   }
 509   if (scrn == 0)
 510       I_MarkRect (stretchx,stretchy,(SWAPSHORT(patch->width)*deltax)>>16,
 511                   (SWAPSHORT(patch->height)*deltax)>>16);
 512 }
 513
 514
 515
 516 //
 517 // V_DrawBlock
 518 // Draw a linear block of pixels into the view buffer.
 519 //
 520 void
 521 V_DrawBlock
 522 ( int           x,
 523   int           y,
 524   int           scrn,
 525   int           width,
 526   int           height,
 527   byte*         src )
 528 {
 529     byte*       dest;
 530     int         height0;
 531
 532 #ifdef RANGECHECK
 533     if (x<0
 534         ||x+width >SCREENWIDTH
 535         || y<0
 536         || y+height>SCREENHEIGHT
 537         || (unsigned)scrn>4 )
 538     {
 539         I_Error ("Bad V_DrawBlock");
 540     }
 541 #endif
 542
 543     height0 = height;
 544     dest = screens[scrn] + y*SCREENWIDTH+x;
 545
 546     while (height--)
 547     {
 548         memcpy (dest, src, width);
 549         src += width;
 550         dest += SCREENWIDTH;
 551     }
 552     if (scrn == 0)
 553         I_MarkRect (x, y, width, height0);
 554 }
 555
 556
 557
 558 //
 559 // V_GetBlock
 560 // Gets a linear block of pixels from the view buffer.
 561 //
 562 void
 563 V_GetBlock
 564 ( int           x,
 565   int           y,
 566   int           scrn,
 567   int           width,
 568   int           height,
 569   byte*         dest )
 570 {
 571     byte*       src;
 572
 573 #ifdef RANGECHECK
 574     if (x<0
 575         ||x+width >SCREENWIDTH
 576         || y<0
 577         || y+height>SCREENHEIGHT
 578         || (unsigned)scrn>4 )
 579     {
 580         I_Error ("Bad V_DrawBlock");
 581     }
 582 #endif
 583
 584     src = screens[scrn] + y*SCREENWIDTH+x;
 585
 586     while (height--)
 587     {
 588         memcpy (dest, src, width);
 589         src += SCREENWIDTH;
 590         dest += width;
 591     }
 592 }
 593
 594
 595 #ifdef GRAFFITI
 596 extern int video_graffiti;
 597 #endif
 598
 599
 600 //
 601 // V_Init
 602 //
 603 void V_Init (void)
 604 {
 605     int i;
 606     int p;
 607     int vid_flags;
 608     int vid_size;
 609
 610 #ifdef GRAFFITI
 611     video_graffiti = 0;
 612     if (M_CheckParm ("-graffitilo")) {
 613       video_graffiti = 1;
 614       SCREENWIDTH = 320;
 615       SCREENHEIGHT = 200;
 616     } else if (M_CheckParm ("-graffitihi")) {
 617       video_graffiti = 2;
 618       SCREENWIDTH = 640;
 619       SCREENHEIGHT = 400;
 620     } else {
 621 #endif
 622
 623      p = M_CheckParm ("-width");
 624       if (p && p < myargc-1)
 625         SCREENWIDTH = atoi(myargv[p+1]);
 626       else
 627         SCREENWIDTH = 320;
 628
 629       p = M_CheckParm ("-height");
 630       if (p && p < myargc-1)
 631         SCREENHEIGHT = atoi(myargv[p+1]);
 632       else
 633         SCREENHEIGHT = 200;
 634
 635 #ifdef GRAFFITI
 636     }
 637 #endif
 638
 639     printf ("Resolution: %d x %d\n", SCREENWIDTH, SCREENHEIGHT);
 640
 641     if (SCREENWIDTH < 320 || SCREENWIDTH > MAXSCREENWIDTH ||
 642         SCREENWIDTH % 32 != 0 ||
 643         SCREENHEIGHT < 200 || SCREENHEIGHT > MAXSCREENHEIGHT)
 644       I_Error ("Resolution out of range or width is not a multiple of 32");
 645
 646     if ((SCREENHEIGHT*8) == (SCREENWIDTH*5))      // 640x400, 320x200
 647       weirdaspect = 1;
 648     else if ((SCREENHEIGHT*4) == (SCREENWIDTH*3)) // 640x480, 320x240
 649       weirdaspect = 0;
 650     else {
 651       weirdaspect = 0;
 652       printf("Warning: Bad aspect ratio, things might look screwy\n");
 653     }
 654
 655
 656     //allocate all the res-dependant vars
 657     resinit_r_plane ();
 658     resinit_am_map ();
 659     resinit_r_draw ();
 660     xtoviewangle = (angle_t *)I_calloc (SCREENWIDTH+1, sizeof(angle_t));
 661     negonearray = (short *)I_calloc (SCREENWIDTH, sizeof(short));
 662     screenheightarray = (short *)I_calloc (SCREENWIDTH, sizeof(short));
 663
 664     // stick these in low dos memory on PCs
 665
 666     vid_flags = MEMF_CLEAR+MEMF_FAST+MEMF_PUBLIC;
 667     if (M_CheckParm ("-mmu"))
 668       vid_flags += MEMF_NOCACHESYNCPPC+MEMF_NOCACHESYNCM68K;
 669     vid_size = SCREENWIDTH*SCREENHEIGHT*4+SCREENWIDTH*ST_HEIGHT;
 670     vid_mem = PPCAllocVec(vid_size + 100, vid_flags);
 671     if (vid_mem == NULL)
 672       I_Error ("Couldn't allocate memory for screens\n");
 673     printf ("Screen memory located at $%08lx\n", (long)vid_mem);
 674
 675     for (i=0 ; i<4 ; i++)
 676         screens[i] = vid_mem + 100 + i*SCREENWIDTH*SCREENHEIGHT;
 677     screens[4] = vid_mem + SCREENWIDTH*SCREENHEIGHT*4;
 678 }