texmap/ntmap.c

   1 /*
   2 THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
   3 SOFTWARE CORPORATION ("PARALLAX").  PARALLAX, IN DISTRIBUTING THE CODE TO
   4 END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
   5 ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
   6 IN USING, DISPLAYING,  AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
   7 SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
   8 FREE PURPOSES.  IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
   9 CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES.  THE END-USER UNDERSTANDS
  10 AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
  11 COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
  12 */
  13 /*
  14  * $Source: /cvs/cvsroot/d2x/texmap/ntmap.c,v $
  15  * $Revision: 1.4 $
  16  * $Author: bradleyb $
  17  * $Date: 2001-10-25 02:22:46 $
  18  *
  19  * Start of conversion to new texture mapper.
  20  *
  21  * $Log: not supported by cvs2svn $
  22  * Revision 1.3  2001/01/31 15:18:04  bradleyb
  23  * Makefile and conf.h fixes
  24  *
  25  * Revision 1.2  2001/01/31 14:04:46  bradleyb
  26  * Fix compiler warnings
  27  *
  28  * Revision 1.1.1.1  2001/01/19 03:30:16  bradleyb
  29  * Import of d2x-0.0.8
  30  *
  31  * Revision 1.4  1999/10/18 00:31:55  donut
  32  * allow FP_TMAP to be used without NO_ASM
  33  *
  34  * Revision 1.3  1999/08/05 22:53:41  sekmu
  35  *
  36  * D3D patch(es) from ADB
  37  *
  38  * Revision 1.2  1999/07/07 21:31:09  donut
  39  * removed unused vars from ntmap_scanline_lighted and slightly optomized it
  40  *
  41  * Revision 1.1.1.1  1999/06/14 22:14:06  donut
  42  * Import of d1x 1.37 source.
  43  *
  44  * Revision 1.52  1995/03/14  15:13:06  john
  45  * Increased MAX_Y_Pointers to 480.
  46  *
  47  * Revision 1.51  1995/02/23  14:25:09  john
  48  * Added editor tmap.
  49  *
  50  * Revision 1.50  1995/02/20  18:22:58  john
  51  * Put all the externs in the assembly modules into tmap_inc.asm.
  52  * Also, moved all the C versions of the inner loops into a new module,
  53  * scanline.c.
  54  *
  55  * Revision 1.49  1995/02/20  17:09:11  john
  56  * Added code so that you can build the tmapper with no assembly!
  57  *
  58  * Revision 1.48  1995/01/06  11:11:30  mike
  59  * even when not in editor, have 400 lines in texture map scanline table.
  60  *
  61  * Revision 1.47  1994/12/15  16:43:25  matt
  62  * Took out code only needed by editor
  63  *
  64  * Revision 1.46  1994/12/09  22:35:37  mike
  65  * fix bug in before call to asm_tmap_scanline_per causing write of pixel onto past right border onto left.
  66  *
  67  * Revision 1.45  1994/12/06  16:31:06  mike
  68  * fix bug in asm_tmap_scanline_matt interface.
  69  *
  70  * Revision 1.44  1994/12/04  20:37:18  mike
  71  * *** empty log message ***
  72  *
  73  * Revision 1.43  1994/12/02  23:30:04  mike
  74  * optimizations.
  75  *
  76  * Revision 1.42  1994/11/30  00:57:43  mike
  77  * optimizations.
  78  *
  79  * Revision 1.41  1994/11/28  13:34:27  mike
  80  * optimizations.
  81  *
  82  * Revision 1.40  1994/11/28  01:30:01  mike
  83  * kill warning.
  84  *
  85  * Revision 1.39  1994/11/28  01:28:59  mike
  86  * optimizations.
  87  *
  88  * Revision 1.38  1994/11/21  14:08:07  john
  89  * Took out all multiple instead of divide code.
  90  *
  91  * Revision 1.37  1994/11/19  15:21:52  mike
  92  * rip out unused code.
  93  *
  94  * Revision 1.36  1994/11/14  11:42:51  mike
  95  * optimization.
  96  *
  97  * Revision 1.35  1994/11/12  16:41:36  mike
  98  * *** empty log message ***
  99  *
 100  * Revision 1.34  1994/11/10  21:28:41  mike
 101  * remove call to init_interface_vars_to_assembler.
 102  *
 103  * Revision 1.33  1994/11/10  11:08:59  mike
 104  * detail level stuff.
 105  *
 106  * Revision 1.32  1994/11/09  22:55:52  matt
 107  * Added variable Current_seg_depth for detail level optimization
 108  *
 109  * Revision 1.31  1994/11/09  19:57:31  john
 110  * Added texture rle caching.
 111  *
 112  * Revision 1.30  1994/11/09  19:54:48  mike
 113  * Call flat shader if Tmap_flat_flag set.
 114  *
 115  * Revision 1.29  1994/11/02  21:33:31  john
 116  * Added Burger Bill's optimization, ie.. 2 muls per 8 pixels.
 117  *
 118  * Revision 1.28  1994/11/02  11:32:16  john
 119  * Added code for c callable inner loop and code to
 120  * test dividing out z0.
 121  *
 122  * Revision 1.27  1994/10/28  20:54:32  matt
 123  * Added error checking
 124  *
 125  * Revision 1.26  1994/10/25  11:20:20  mike
 126  * fix bug in lighting overflow checking for one scanline tall linear texture maps.
 127  *
 128  * Revision 1.25  1994/08/03  15:40:33  mike
 129  * Prevent divide overflows, decrease occurrence of precision-caused glitches.
 130  *
 131  * Revision 1.24  1994/07/27  09:31:16  mike
 132  * Fix concave texture map problem, decrease occurrence of unimportant int 3.
 133  *
 134  * Revision 1.23  1994/06/17  12:23:31  mike
 135  * Support non-lighted texture maps.
 136  *
 137  * Revision 1.22  1994/06/11  08:10:24  mike
 138  * Fix mysterious hang bug, lighting value was out of range.
 139  *
 140  * Revision 1.21  1994/06/09  16:10:16  mike
 141  * Change SC2000 from constant to variable.
 142  *
 143  */
 144
 145 #ifdef HAVE_CONFIG_H
 146 #include <conf.h>
 147 #endif
 148
 149 #ifdef RCS
 150 static char rcsid[] = "$Id: ntmap.c,v 1.4 2001-10-25 02:22:46 bradleyb Exp $";
 151 #endif
 152
 153 #define VESA 0
 154 #define NUM_TMAPS 16
 155
 156 #define HEADLIGHT_LIGHTING 0
 157
 158 #define WIREFRAME 0
 159 #define PERSPECTIVE 1
 160
 161 #include "pstypes.h"
 162 #include "fix.h"
 163 #include "vecmat.h"
 164 #include "gr.h"
 165 #include "3d.h"
 166 #include "error.h"
 167
 168 #include "texmap.h"
 169 #include "texmapl.h"
 170 #include "rle.h"
 171 #include "scanline.h"
 172
 173 //#include "../main/textures.h"
 174
 175 #ifdef EDITOR
 176 #define EDITOR_TMAP 1       //if in, include extra stuff
 177 #endif
 178
 179 #define F15_5 (F1_0*15 + F0_5)
 180
 181 // Temporary texture map, interface from Matt's 3d system to Mike's texture mapper.
 182 g3ds_tmap Tmap1;
 183
 184 grs_bitmap Texmap_ptrs[NUM_TMAPS];
 185 grs_bitmap Texmap4_ptrs[NUM_TMAPS];
 186
 187 fix Range_max=0; // debug, kill me
 188
 189 int     Interpolation_method=0; // 0 = choose best method
 190 int     Lighting_on=1;                  // initialize to no lighting
 191 int     Tmap_flat_flag = 0;             //      1 = render texture maps as flat shaded polygons.
 192 int     Current_seg_depth;              // HACK INTERFACE: how far away the current segment (& thus texture) is
 193 int     Max_perspective_depth;
 194 int     Max_linear_depth;
 195 int     Max_flat_depth;
 196
 197 extern int Window_clip_left, Window_clip_bot, Window_clip_right, Window_clip_top;
 198
 199 // These variables are the interface to assembler.  They get set for each texture map, which is a real waste of time.
 200 //      They should be set only when they change, which is generally when the window bounds change.  And, even still, it's
 201 //      a pretty bad interface.
 202 int     bytes_per_row=-1;
 203 unsigned char *write_buffer;
 204 int     window_left;
 205 int     window_right;
 206 int     window_top;
 207 int     window_bottom;
 208 int     window_width;
 209 int     window_height;
 210
 211 #ifdef EDITOR_TMAP
 212 #define MAX_Y_POINTERS  600
 213 #else
 214 #define MAX_Y_POINTERS  600
 215 #endif
 216 int     y_pointers[MAX_Y_POINTERS];
 217
 218 fix fix_recip[FIX_RECIP_TABLE_SIZE];
 219
 220 int     Lighting_enabled;
 221 int     Fix_recip_table_computed=0;
 222
 223 fix fx_l, fx_u, fx_v, fx_z, fx_du_dx, fx_dv_dx, fx_dz_dx, fx_dl_dx;
 224 int fx_xleft, fx_xright, fx_y;
 225 unsigned char * pixptr;
 226 int per2_flag = 0;
 227 int Transparency_on = 0;
 228 int dither_intensity_lighting = 0;
 229
 230 ubyte * tmap_flat_cthru_table;
 231 ubyte tmap_flat_color;
 232 ubyte tmap_flat_shade_value;
 233
 234
 235
 236 // -------------------------------------------------------------------------------------
 237 void init_fix_recip_table(void)
 238 {
 239         int     i;
 240
 241         fix_recip[0] = F1_0;
 242
 243         for (i=1; i<FIX_RECIP_TABLE_SIZE; i++)
 244                 fix_recip[i] = F1_0/i;
 245
 246         Fix_recip_table_computed = 1;
 247 }
 248
 249 // -------------------------------------------------------------------------------------
 250 //      Initialize interface variables to assembler.
 251 //      These things used to be constants.  This routine is now (10/6/93) getting called for
 252 //      every texture map.  It should get called whenever the window changes, or, preferably,
 253 //      not at all.  I'm pretty sure these variables are only being used for range checking.
 254 void init_interface_vars_to_assembler(void)
 255 {
 256         grs_bitmap      *bp;
 257
 258         bp = &grd_curcanv->cv_bitmap;
 259
 260         Assert(bp!=NULL);
 261         Assert(bp->bm_data!=NULL);
 262         Assert(bp->bm_h <= MAX_Y_POINTERS);
 263
 264         //      If bytes_per_row has changed, create new table of pointers.
 265         if (bytes_per_row != (int) bp->bm_rowsize) {
 266                 int     y_val, i;
 267
 268                 bytes_per_row = (int) bp->bm_rowsize;
 269
 270                 y_val = 0;
 271                 for (i=0; i<MAX_Y_POINTERS; i++) {
 272                         y_pointers[i] = y_val;
 273                         y_val += bytes_per_row;
 274                 }
 275         }
 276
 277         write_buffer = (unsigned char *) bp->bm_data;
 278
 279         window_left = 0;
 280         window_right = (int) bp->bm_w-1;
 281         window_top = 0;
 282         window_bottom = (int) bp->bm_h-1;
 283
 284         Window_clip_left = window_left;
 285         Window_clip_right = window_right;
 286         Window_clip_top = window_top;
 287         Window_clip_bot = window_bottom;
 288
 289         window_width = bp->bm_w;
 290         window_height = bp->bm_h;
 291
 292         if (!Fix_recip_table_computed)
 293                 init_fix_recip_table();
 294 }
 295
 296 // -------------------------------------------------------------------------------------
 297 //                             VARIABLES
 298 extern g3ds_tmap Tmap1;
 299
 300 // -------------------------------------------------------------------------------------
 301 //      Returns number preceding val modulo modulus.
 302 //      prevmod(3,4) = 2
 303 //      prevmod(0,4) = 3
 304 int prevmod(int val,int modulus)
 305 {
 306         if (val > 0)
 307                 return val-1;
 308         else
 309                 return modulus-1;
 310 //      return (val + modulus - 1) % modulus;
 311 }
 312
 313
 314 //      Returns number succeeding val modulo modulus.
 315 //      succmod(3,4) = 0
 316 //      succmod(0,4) = 1
 317 int succmod(int val,int modulus)
 318 {
 319         if (val < modulus-1)
 320                 return val+1;
 321         else
 322                 return 0;
 323
 324 //      return (val + 1) % modulus;
 325 }
 326
 327 // -------------------------------------------------------------------------------------
 328 //      Select topmost vertex (minimum y coordinate) and bottommost (maximum y coordinate) in
 329 //      texture map.  If either is part of a horizontal edge, then select leftmost vertex for
 330 //      top, rightmost vertex for bottom.
 331 //      Important: Vertex is selected with integer precision.  So, if there are vertices at
 332 //      (0.0,0.7) and (0.5,0.3), the first vertex is selected, because they y coordinates are
 333 //      considered the same, so the smaller x is favored.
 334 //      Parameters:
 335 //              nv              number of vertices
 336 //              v3d     pointer to 3d vertices containing u,v,x2d,y2d coordinates
 337 //      Results in:
 338 //              *min_y_ind
 339 //              *max_y_ind
 340 // -------------------------------------------------------------------------------------
 341 void compute_y_bounds(g3ds_tmap *t, int *vlt, int *vlb, int *vrt, int *vrb,int *bottom_y_ind)
 342 {
 343         int     i;
 344         int     min_y,max_y;
 345         int     min_y_ind;
 346         int     original_vrt;
 347         fix     min_x;
 348
 349         // Scan all vertices, set min_y_ind to vertex with smallest y coordinate.
 350         min_y = f2i(t->verts[0].y2d);
 351         max_y = min_y;
 352         min_y_ind = 0;
 353         min_x = f2i(t->verts[0].x2d);
 354         *bottom_y_ind = 0;
 355
 356         for (i=1; i<t->nv; i++) {
 357                 if (f2i(t->verts[i].y2d) < min_y) {
 358                         min_y = f2i(t->verts[i].y2d);
 359                         min_y_ind = i;
 360                         min_x = f2i(t->verts[i].x2d);
 361                 } else if (f2i(t->verts[i].y2d) == min_y) {
 362                         if (f2i(t->verts[i].x2d) < min_x) {
 363                                 min_y_ind = i;
 364                                 min_x = f2i(t->verts[i].x2d);
 365                         }
 366                 }
 367                 if (f2i(t->verts[i].y2d) > max_y) {
 368                         max_y = f2i(t->verts[i].y2d);
 369                         *bottom_y_ind = i;
 370                 }
 371         }
 372
 373 //--removed mk, 11/27/94--      //      Check for a non-upright-hourglass polygon and fix, if necessary, by bashing a y coordinate.
 374 //--removed mk, 11/27/94--      //      min_y_ind = index of minimum y coordinate, *bottom_y_ind = index of maximum y coordinate
 375 //--removed mk, 11/27/94--{
 376 //--removed mk, 11/27/94--      int     max_temp, min_temp;
 377 //--removed mk, 11/27/94--
 378 //--removed mk, 11/27/94--      max_temp = *bottom_y_ind;
 379 //--removed mk, 11/27/94--      if (*bottom_y_ind < min_y_ind)
 380 //--removed mk, 11/27/94--              max_temp += t->nv;
 381 //--removed mk, 11/27/94--
 382 //--removed mk, 11/27/94--      for (i=min_y_ind; i<max_temp; i++) {
 383 //--removed mk, 11/27/94--              if (f2i(t->verts[i%t->nv].y2d) > f2i(t->verts[(i+1)%t->nv].y2d)) {
 384 //--removed mk, 11/27/94--                      Int3();
 385 //--removed mk, 11/27/94--                      t->verts[(i+1)%t->nv].y2d = t->verts[i%t->nv].y2d;
 386 //--removed mk, 11/27/94--              }
 387 //--removed mk, 11/27/94--      }
 388 //--removed mk, 11/27/94--
 389 //--removed mk, 11/27/94--      min_temp = min_y_ind;
 390 //--removed mk, 11/27/94--      if (min_y_ind < *bottom_y_ind)
 391 //--removed mk, 11/27/94--              min_temp += t->nv;
 392 //--removed mk, 11/27/94--
 393 //--removed mk, 11/27/94--      for (i=*bottom_y_ind; i<min_temp; i++) {
 394 //--removed mk, 11/27/94--              if (f2i(t->verts[i%t->nv].y2d) < f2i(t->verts[(i+1)%t->nv].y2d)) {
 395 //--removed mk, 11/27/94--                      Int3();
 396 //--removed mk, 11/27/94--                      t->verts[(i+1)%t->nv].y2d = t->verts[i%t->nv].y2d;
 397 //--removed mk, 11/27/94--              }
 398 //--removed mk, 11/27/94--      }
 399 //--removed mk, 11/27/94--}
 400
 401         // Set "vertex left top", etc. based on vertex with topmost y coordinate
 402         *vlt = min_y_ind;
 403         *vrt = *vlt;
 404         *vlb = prevmod(*vlt,t->nv);
 405         *vrb = succmod(*vrt,t->nv);
 406
 407         // If right edge is horizontal, then advance along polygon bound until it no longer is or until all
 408         // vertices have been examined.
 409         // (Left edge cannot be horizontal, because *vlt is set to leftmost point with highest y coordinate.)
 410
 411         original_vrt = *vrt;
 412
 413         while (f2i(t->verts[*vrt].y2d) == f2i(t->verts[*vrb].y2d)) {
 414                 if (succmod(*vrt,t->nv) == original_vrt) {
 415                         break;
 416                 }
 417                 *vrt = succmod(*vrt,t->nv);
 418                 *vrb = succmod(*vrt,t->nv);
 419         }
 420 }
 421
 422 // -------------------------------------------------------------------------------------
 423 //      Returns dx/dy given two vertices.
 424 //      If dy == 0, returns 0.0
 425 // -------------------------------------------------------------------------------------
 426 //--fix compute_dx_dy_lin(g3ds_tmap *t, int top_vertex,int bottom_vertex)
 427 //--{
 428 //--    int     dy;
 429 //--
 430 //--    // compute delta x with respect to y for any edge
 431 //--    dy = f2i(t->verts[bottom_vertex].y2d - t->verts[top_vertex].y2d) + 1;
 432 //--    if (dy)
 433 //--            return (t->verts[bottom_vertex].x2d - t->verts[top_vertex].x2d) / dy;
 434 //--    else
 435 //--            return 0;
 436 //--
 437 //--}
 438
 439 fix compute_du_dy_lin(g3ds_tmap *t, int top_vertex,int bottom_vertex, fix recip_dy)
 440 {
 441         return fixmul(t->verts[bottom_vertex].u - t->verts[top_vertex].u, recip_dy);
 442 }
 443
 444
 445 fix compute_dv_dy_lin(g3ds_tmap *t, int top_vertex,int bottom_vertex, fix recip_dy)
 446 {
 447         return fixmul(t->verts[bottom_vertex].v - t->verts[top_vertex].v, recip_dy);
 448 }
 449
 450 fix compute_dl_dy_lin(g3ds_tmap *t, int top_vertex,int bottom_vertex, fix recip_dy)
 451 {
 452         return fixmul(t->verts[bottom_vertex].l - t->verts[top_vertex].l, recip_dy);
 453
 454 }
 455
 456 fix compute_dx_dy(g3ds_tmap *t, int top_vertex,int bottom_vertex, fix recip_dy)
 457 {
 458         return fixmul(t->verts[bottom_vertex].x2d - t->verts[top_vertex].x2d, recip_dy);
 459 }
 460
 461 fix compute_du_dy(g3ds_tmap *t, int top_vertex,int bottom_vertex, fix recip_dy)
 462 {
 463         return fixmul(fixmul(t->verts[bottom_vertex].u,t->verts[bottom_vertex].z) - fixmul(t->verts[top_vertex].u,t->verts[top_vertex].z), recip_dy);
 464 }
 465
 466
 467 fix compute_dv_dy(g3ds_tmap *t, int top_vertex,int bottom_vertex, fix recip_dy)
 468 {
 469         return fixmul(fixmul(t->verts[bottom_vertex].v,t->verts[bottom_vertex].z) - fixmul(t->verts[top_vertex].v,t->verts[top_vertex].z), recip_dy);
 470
 471 }
 472
 473 fix compute_dz_dy(g3ds_tmap *t, int top_vertex,int bottom_vertex, fix recip_dy)
 474 {
 475         return fixmul(t->verts[bottom_vertex].z - t->verts[top_vertex].z, recip_dy);
 476
 477 }
 478 int Skip_short_flag=0;
 479
 480 // -------------------------------------------------------------------------------------
 481 //      Texture map current scanline in perspective.
 482 // -------------------------------------------------------------------------------------
 483 void ntmap_scanline_lighted(grs_bitmap *srcb, int y, fix xleft, fix xright, fix uleft, fix uright, fix vleft, fix vright, fix zleft, fix zright, fix lleft, fix lright)
 484 {
 485         fix     dx,recip_dx;
 486
 487         fx_xright = f2i(xright);
 488         //edited 06/27/99 Matt Mueller - moved these tests up from within the switch so as not to do a bunch of needless calculations when we are just gonna return anyway.  Slight fps boost?
 489         if (fx_xright < Window_clip_left)
 490                 return;
 491         fx_xleft = f2i(xleft);
 492         if (fx_xleft > Window_clip_right)
 493                 return;
 494         //end edit -MM
 495
 496         dx = fx_xright - fx_xleft;
 497         if ((dx < 0) || (xright < 0) || (xleft > xright))               // the (xleft > xright) term is not redundant with (dx < 0) because dx is computed using integers
 498                 return;
 499
 500         // setup to call assembler scanline renderer
 501         if (dx < FIX_RECIP_TABLE_SIZE)
 502                 recip_dx = fix_recip[dx];
 503         else
 504                 recip_dx = F1_0/dx;
 505
 506         fx_u = uleft;
 507         fx_v = vleft;
 508         fx_z = zleft;
 509
 510         fx_du_dx = fixmul(uright - uleft,recip_dx);
 511         fx_dv_dx = fixmul(vright - vleft,recip_dx);
 512         fx_dz_dx = fixmul(zright - zleft,recip_dx);
 513         fx_y = y;
 514         pixptr = srcb->bm_data;
 515
 516         switch (Lighting_enabled) {
 517                 case 0:
 518                         //added 05/17/99 Matt Mueller - prevent writing before the buffer
 519             if ((fx_y == 0) && (fx_xleft < 0))
 520                                 fx_xleft = 0;
 521                         //end addition -MM
 522                         if (fx_xright > Window_clip_right)
 523                                 fx_xright = Window_clip_right;
 524
 525                         cur_tmap_scanline_per();
 526                         break;
 527                 case 1: {
 528                         fix     mul_thing;
 529
 530                         if (lleft < 0) lleft = 0;
 531                         if (lright < 0) lright = 0;
 532                         if (lleft > (NUM_LIGHTING_LEVELS*F1_0-F1_0/2)) lleft = (NUM_LIGHTING_LEVELS*F1_0-F1_0/2);
 533                         if (lright > (NUM_LIGHTING_LEVELS*F1_0-F1_0/2)) lright = (NUM_LIGHTING_LEVELS*F1_0-F1_0/2);
 534
 535                         fx_l = lleft;
 536                         fx_dl_dx = fixmul(lright - lleft,recip_dx);
 537
 538                         //      This is a pretty ugly hack to prevent lighting overflows.
 539                         mul_thing = dx * fx_dl_dx;
 540                         if (lleft + mul_thing < 0)
 541                                 fx_dl_dx += 12;
 542                         else if (lleft + mul_thing > (NUM_LIGHTING_LEVELS*F1_0-F1_0/2))
 543                                 fx_dl_dx -= 12;
 544
 545                         //added 05/17/99 Matt Mueller - prevent writing before the buffer
 546             if ((fx_y == 0) && (fx_xleft < 0))
 547                                 fx_xleft = 0;
 548                         //end addition -MM
 549                         if (fx_xright > Window_clip_right)
 550                                 fx_xright = Window_clip_right;
 551
 552                         cur_tmap_scanline_per();
 553                         break;
 554                 }
 555                 case 2:
 556 #ifdef EDITOR_TMAP
 557                         fx_xright = f2i(xright);
 558                         fx_xleft = f2i(xleft);
 559
 560 #if defined(FL1_WITH_FLAT) || defined(NO_ASM)
 561                         tmap_flat_color = 1;
 562                         #ifdef NO_ASM
 563                         c_tmap_scanline_flat();
 564                         #else
 565                         asm_tmap_scanline_flat();
 566                         #endif
 567 #else
 568                         asm_tmap_scanline_matt();
 569 #endif
 570 #else
 571                         Int3(); //      Illegal, called an editor only routine!
 572 #endif
 573                         break;
 574         }
 575
 576 }
 577
 578 int Do_vertical_scan=0;
 579
 580 int     Break_on_flat=0;
 581
 582 // -------------------------------------------------------------------------------------
 583 //      Render a texture map with lighting using perspective interpolation in inner and outer loops.
 584 // -------------------------------------------------------------------------------------
 585 void ntexture_map_lighted(grs_bitmap *srcb, g3ds_tmap *t)
 586 {
 587         int     vlt,vrt,vlb,vrb;        // vertex left top, vertex right top, vertex left bottom, vertex right bottom
 588         int     topy,boty,y, dy;
 589         fix     dx_dy_left,dx_dy_right;
 590         fix     du_dy_left,du_dy_right;
 591         fix     dv_dy_left,dv_dy_right;
 592         fix     dz_dy_left,dz_dy_right;
 593         fix     dl_dy_left,dl_dy_right;
 594         fix     recip_dyl, recip_dyr;
 595         int     max_y_vertex;
 596         fix     xleft,xright,uleft,vleft,uright,vright,zleft,zright,lleft,lright;
 597         int     next_break_left, next_break_right;
 598
 599         g3ds_vertex *v3d;
 600
 601         //remove stupid warnings in compile
 602         dl_dy_left = F1_0;
 603         dl_dy_right = F1_0;
 604         lleft = F1_0;
 605         lright = F1_0;
 606
 607         v3d = t->verts;
 608
 609         // Determine top and bottom y coords.
 610         compute_y_bounds(t,&vlt,&vlb,&vrt,&vrb,&max_y_vertex);
 611
 612         // Set top and bottom (of entire texture map) y coordinates.
 613         topy = f2i(v3d[vlt].y2d);
 614         boty = f2i(v3d[max_y_vertex].y2d);
 615         if (topy > Window_clip_bot)
 616                 return;
 617         if (boty > Window_clip_bot)
 618                 boty = Window_clip_bot;
 619
 620         // Set amount to change x coordinate for each advance to next scanline.
 621         dy = f2i(t->verts[vlb].y2d) - f2i(t->verts[vlt].y2d);
 622         if (dy < FIX_RECIP_TABLE_SIZE)
 623                 recip_dyl = fix_recip[dy];
 624         else
 625                 recip_dyl = F1_0/dy;
 626
 627         dx_dy_left = compute_dx_dy(t,vlt,vlb, recip_dyl);
 628         du_dy_left = compute_du_dy(t,vlt,vlb, recip_dyl);
 629         dv_dy_left = compute_dv_dy(t,vlt,vlb, recip_dyl);
 630         dz_dy_left = compute_dz_dy(t,vlt,vlb, recip_dyl);
 631
 632         dy = f2i(t->verts[vrb].y2d) - f2i(t->verts[vrt].y2d);
 633         if (dy < FIX_RECIP_TABLE_SIZE)
 634                 recip_dyr = fix_recip[dy];
 635         else
 636                 recip_dyr = F1_0/dy;
 637
 638         du_dy_right = compute_du_dy(t,vrt,vrb, recip_dyr);
 639         dx_dy_right = compute_dx_dy(t,vrt,vrb, recip_dyr);
 640         dv_dy_right = compute_dv_dy(t,vrt,vrb, recip_dyr);
 641         dz_dy_right = compute_dz_dy(t,vrt,vrb, recip_dyr);
 642
 643         if (Lighting_enabled) {
 644                 dl_dy_left = compute_dl_dy_lin(t,vlt,vlb, recip_dyl);
 645                 dl_dy_right = compute_dl_dy_lin(t,vrt,vrb, recip_dyr);
 646
 647                 lleft = v3d[vlt].l;
 648                 lright = v3d[vrt].l;
 649         }
 650
 651         // Set initial values for x, u, v
 652         xleft = v3d[vlt].x2d;
 653         xright = v3d[vrt].x2d;
 654
 655         zleft = v3d[vlt].z;
 656         zright = v3d[vrt].z;
 657
 658         uleft = fixmul(v3d[vlt].u,zleft);
 659         uright = fixmul(v3d[vrt].u,zright);
 660         vleft = fixmul(v3d[vlt].v,zleft);
 661         vright = fixmul(v3d[vrt].v,zright);
 662
 663         // scan all rows in texture map from top through first break.
 664         next_break_left = f2i(v3d[vlb].y2d);
 665         next_break_right = f2i(v3d[vrb].y2d);
 666
 667         for (y = topy; y < boty; y++) {
 668
 669                 // See if we have reached the end of the current left edge, and if so, set
 670                 // new values for dx_dy and x,u,v
 671                 if (y == next_break_left) {
 672                         fix     recip_dy;
 673
 674                         // Handle problem of double points.  Search until y coord is different.  Cannot get
 675                         // hung in an infinite loop because we know there is a vertex with a lower y coordinate
 676                         // because in the for loop, we don't scan all spanlines.
 677                         while (y == f2i(v3d[vlb].y2d)) {
 678                                 vlt = vlb;
 679                                 vlb = prevmod(vlb,t->nv);
 680                         }
 681                         next_break_left = f2i(v3d[vlb].y2d);
 682
 683                         dy = f2i(t->verts[vlb].y2d) - f2i(t->verts[vlt].y2d);
 684                         if (dy < FIX_RECIP_TABLE_SIZE)
 685                                 recip_dy = fix_recip[dy];
 686                         else
 687                                 recip_dy = F1_0/dy;
 688
 689                         dx_dy_left = compute_dx_dy(t,vlt,vlb, recip_dy);
 690
 691                         xleft = v3d[vlt].x2d;
 692                         zleft = v3d[vlt].z;
 693                         uleft = fixmul(v3d[vlt].u,zleft);
 694                         vleft = fixmul(v3d[vlt].v,zleft);
 695                         lleft = v3d[vlt].l;
 696
 697                         du_dy_left = compute_du_dy(t,vlt,vlb, recip_dy);
 698                         dv_dy_left = compute_dv_dy(t,vlt,vlb, recip_dy);
 699                         dz_dy_left = compute_dz_dy(t,vlt,vlb, recip_dy);
 700
 701                         if (Lighting_enabled) {
 702                                 dl_dy_left = compute_dl_dy_lin(t,vlt,vlb, recip_dy);
 703                                 lleft = v3d[vlt].l;
 704                         }
 705                 }
 706
 707                 // See if we have reached the end of the current left edge, and if so, set
 708                 // new values for dx_dy and x.  Not necessary to set new values for u,v.
 709                 if (y == next_break_right) {
 710                         fix     recip_dy;
 711
 712                         while (y == f2i(v3d[vrb].y2d)) {
 713                                 vrt = vrb;
 714                                 vrb = succmod(vrb,t->nv);
 715                         }
 716
 717                         next_break_right = f2i(v3d[vrb].y2d);
 718
 719                         dy = f2i(t->verts[vrb].y2d) - f2i(t->verts[vrt].y2d);
 720                         if (dy < FIX_RECIP_TABLE_SIZE)
 721                                 recip_dy = fix_recip[dy];
 722                         else
 723                                 recip_dy = F1_0/dy;
 724
 725                         dx_dy_right = compute_dx_dy(t,vrt,vrb, recip_dy);
 726
 727                         xright = v3d[vrt].x2d;
 728                         zright = v3d[vrt].z;
 729                         uright = fixmul(v3d[vrt].u,zright);
 730                         vright = fixmul(v3d[vrt].v,zright);
 731
 732                         du_dy_right = compute_du_dy(t,vrt,vrb, recip_dy);
 733                         dv_dy_right = compute_dv_dy(t,vrt,vrb, recip_dy);
 734                         dz_dy_right = compute_dz_dy(t,vrt,vrb, recip_dy);
 735
 736                         if (Lighting_enabled) {
 737                                 dl_dy_right = compute_dl_dy_lin(t,vrt,vrb, recip_dy);
 738                                 lright = v3d[vrt].l;
 739                         }
 740                 }
 741
 742                 if (Lighting_enabled) {
 743                         if (y >= Window_clip_top)
 744                                 ntmap_scanline_lighted(srcb,y,xleft,xright,uleft,uright,vleft,vright,zleft,zright,lleft,lright);
 745                         lleft += dl_dy_left;
 746                         lright += dl_dy_right;
 747                 } else
 748                         if (y >= Window_clip_top)
 749                                 ntmap_scanline_lighted(srcb,y,xleft,xright,uleft,uright,vleft,vright,zleft,zright,lleft,lright);
 750
 751                 uleft += du_dy_left;
 752                 vleft += dv_dy_left;
 753
 754                 uright += du_dy_right;
 755                 vright += dv_dy_right;
 756
 757                 xleft += dx_dy_left;
 758                 xright += dx_dy_right;
 759
 760                 zleft += dz_dy_left;
 761                 zright += dz_dy_right;
 762
 763         }
 764
 765         // We can get lleft or lright out of bounds here because we compute dl_dy using fixed point values,
 766         //      but we plot an integer number of scanlines, therefore doing an integer number of additions of the delta.
 767
 768 //if (Break_on_flat)
 769 //      mprintf(0, "[%i %i %i] ", y, f2i(xleft), f2i(xright));
 770
 771         ntmap_scanline_lighted(srcb,y,xleft,xright,uleft,uright,vleft,vright,zleft,zright,lleft,lright);
 772 }
 773
 774
 775 // -------------------------------------------------------------------------------------
 776 //      Texture map current scanline using linear interpolation.
 777 // -------------------------------------------------------------------------------------
 778 void ntmap_scanline_lighted_linear(grs_bitmap *srcb, int y, fix xleft, fix xright, fix uleft, fix uright, fix vleft, fix vright, fix lleft, fix lright)
 779 {
 780         fix     u,v,l;
 781         fix     dx,recip_dx;
 782
 783         fix     du_dx,dv_dx,dl_dx;
 784
 785         u = uleft;
 786         v = vleft;
 787         l = lleft;
 788
 789         dx = f2i(xright) - f2i(xleft);
 790         if ((dx < 0) || (xright < 0) || (xleft > xright))               // the (xleft > xright) term is not redundant with (dx < 0) because dx is computed using integers
 791                 return;
 792
 793                 // setup to call assembler scanline renderer
 794                 if (dx < FIX_RECIP_TABLE_SIZE)
 795                         recip_dx = fix_recip[dx];
 796                 else
 797                         recip_dx = F1_0/dx;
 798
 799                 du_dx = fixmul(uright - uleft,recip_dx);
 800                 dv_dx = fixmul(vright - vleft,recip_dx);
 801
 802                 fx_u = uleft;
 803                 fx_v = vleft;
 804                 fx_du_dx = du_dx;
 805                 fx_dv_dx = dv_dx;
 806                 fx_y = y;
 807                 fx_xright = f2i(xright);
 808                 fx_xleft = f2i(xleft);
 809                 pixptr = srcb->bm_data;
 810
 811                 switch (Lighting_enabled) {
 812                         case 0:
 813                                 //added 07/11/99 adb - prevent writing before the buffer
 814                                 if (fx_xleft < 0)
 815                                         fx_xleft = 0;
 816                                 //end addition -adb
 817
 818                                 #ifdef NO_ASM
 819                                         c_tmap_scanline_lin_nolight();
 820                                 #else
 821                                         #ifdef NO_ASM_NOLIGHT
 822                                         asm_tmap_scanline_lin_lighted();
 823                                         #else
 824                                         asm_tmap_scanline_lin();
 825                                         #endif
 826                                 #endif
 827                                 break;
 828                         case 1:
 829                                 if (lleft < F1_0/2)
 830                                         lleft = F1_0/2;
 831                                 if (lright < F1_0/2)
 832                                         lright = F1_0/2;
 833
 834                                 if (lleft > MAX_LIGHTING_VALUE*NUM_LIGHTING_LEVELS)
 835                                         lleft = MAX_LIGHTING_VALUE*NUM_LIGHTING_LEVELS;
 836                                 if (lright > MAX_LIGHTING_VALUE*NUM_LIGHTING_LEVELS)
 837                                         lright = MAX_LIGHTING_VALUE*NUM_LIGHTING_LEVELS;
 838
 839                                 //added 07/11/99 adb - prevent writing before the buffer
 840                                 if (fx_xleft < 0)
 841                                         fx_xleft = 0;
 842                                 //end addition -adb
 843
 844 {
 845                         fix mul_thing;
 846
 847                         fx_l = lleft;
 848                         fx_dl_dx = fixmul(lright - lleft,recip_dx);
 849
 850                         //      This is a pretty ugly hack to prevent lighting overflows.
 851                         mul_thing = dx * fx_dl_dx;
 852                         if (lleft + mul_thing < 0)
 853                                 fx_dl_dx += 12;
 854                         else if (lleft + mul_thing > (NUM_LIGHTING_LEVELS*F1_0-F1_0/2))
 855                                 fx_dl_dx -= 12;
 856 }
 857
 858                                 fx_l = lleft;
 859                                 dl_dx = fixmul(lright - lleft,recip_dx);
 860                                 fx_dl_dx = dl_dx;
 861                                 #ifdef NO_ASM
 862                                         c_tmap_scanline_lin();
 863                                 #else
 864                                         asm_tmap_scanline_lin_lighted();
 865                                 #endif
 866                                 break;
 867                         case 2:
 868 #ifdef EDITOR_TMAP
 869                                 fx_xright = f2i(xright);
 870                                 fx_xleft = f2i(xleft);
 871 #if defined(FL1_WITH_FLAT) || defined(NO_ASM)
 872                                 tmap_flat_color = 1;
 873                                 #ifdef NO_ASM
 874                                 c_tmap_scanline_flat();
 875                                 #else
 876                                 asm_tmap_scanline_flat();
 877                                 #endif
 878 #else
 879                                 asm_tmap_scanline_matt();
 880 #endif
 881 #else
 882                                 Int3(); //      Illegal, called an editor only routine!
 883 #endif
 884                                 break;
 885                 }
 886 }
 887
 888 // -------------------------------------------------------------------------------------
 889 //      Render a texture map with lighting using perspective interpolation in inner and outer loops.
 890 // -------------------------------------------------------------------------------------
 891 void ntexture_map_lighted_linear(grs_bitmap *srcb, g3ds_tmap *t)
 892 {
 893         int     vlt,vrt,vlb,vrb;        // vertex left top, vertex right top, vertex left bottom, vertex right bottom
 894         int     topy,boty,y, dy;
 895         fix     dx_dy_left,dx_dy_right;
 896         fix     du_dy_left,du_dy_right;
 897         fix     dv_dy_left,dv_dy_right;
 898         fix     dl_dy_left,dl_dy_right;
 899         int     max_y_vertex;
 900         fix     xleft,xright,uleft,vleft,uright,vright,lleft,lright;
 901         int     next_break_left, next_break_right;
 902         fix     recip_dyl, recip_dyr;
 903
 904         g3ds_vertex *v3d;
 905
 906         //remove stupid warnings in compile
 907         dl_dy_left = F1_0;
 908         dl_dy_right = F1_0;
 909         lleft = F1_0;
 910         lright = F1_0;
 911
 912         v3d = t->verts;
 913
 914         // Determine top and bottom y coords.
 915         compute_y_bounds(t,&vlt,&vlb,&vrt,&vrb,&max_y_vertex);
 916
 917         // Set top and bottom (of entire texture map) y coordinates.
 918         topy = f2i(v3d[vlt].y2d);
 919         boty = f2i(v3d[max_y_vertex].y2d);
 920
 921         if (topy > Window_clip_bot)
 922                 return;
 923         if (boty > Window_clip_bot)
 924                 boty = Window_clip_bot;
 925
 926         dy = f2i(t->verts[vlb].y2d) - f2i(t->verts[vlt].y2d);
 927         if (dy < FIX_RECIP_TABLE_SIZE)
 928                 recip_dyl = fix_recip[dy];
 929         else
 930                 recip_dyl = F1_0/dy;
 931
 932         dy = f2i(t->verts[vrb].y2d) - f2i(t->verts[vrt].y2d);
 933         if (dy < FIX_RECIP_TABLE_SIZE)
 934                 recip_dyr = fix_recip[dy];
 935         else
 936                 recip_dyr = F1_0/dy;
 937
 938         // Set amount to change x coordinate for each advance to next scanline.
 939         dx_dy_left = compute_dx_dy(t,vlt,vlb, recip_dyl);
 940         dx_dy_right = compute_dx_dy(t,vrt,vrb, recip_dyr);
 941
 942         du_dy_left = compute_du_dy_lin(t,vlt,vlb, recip_dyl);
 943         du_dy_right = compute_du_dy_lin(t,vrt,vrb, recip_dyr);
 944
 945         dv_dy_left = compute_dv_dy_lin(t,vlt,vlb, recip_dyl);
 946         dv_dy_right = compute_dv_dy_lin(t,vrt,vrb, recip_dyr);
 947
 948         if (Lighting_enabled) {
 949                 dl_dy_left = compute_dl_dy_lin(t,vlt,vlb, recip_dyl);
 950                 dl_dy_right = compute_dl_dy_lin(t,vrt,vrb, recip_dyr);
 951
 952                 lleft = v3d[vlt].l;
 953                 lright = v3d[vrt].l;
 954         }
 955
 956         // Set initial values for x, u, v
 957         xleft = v3d[vlt].x2d;
 958         xright = v3d[vrt].x2d;
 959
 960         uleft = v3d[vlt].u;
 961         uright = v3d[vrt].u;
 962         vleft = v3d[vlt].v;
 963         vright = v3d[vrt].v;
 964
 965         // scan all rows in texture map from top through first break.
 966         next_break_left = f2i(v3d[vlb].y2d);
 967         next_break_right = f2i(v3d[vrb].y2d);
 968
 969         for (y = topy; y < boty; y++) {
 970
 971                 // See if we have reached the end of the current left edge, and if so, set
 972                 // new values for dx_dy and x,u,v
 973                 if (y == next_break_left) {
 974                         fix     recip_dy;
 975
 976                         // Handle problem of double points.  Search until y coord is different.  Cannot get
 977                         // hung in an infinite loop because we know there is a vertex with a lower y coordinate
 978                         // because in the for loop, we don't scan all spanlines.
 979                         while (y == f2i(v3d[vlb].y2d)) {
 980                                 vlt = vlb;
 981                                 vlb = prevmod(vlb,t->nv);
 982                         }
 983                         next_break_left = f2i(v3d[vlb].y2d);
 984
 985                         dy = f2i(t->verts[vlb].y2d) - f2i(t->verts[vlt].y2d);
 986                         if (dy < FIX_RECIP_TABLE_SIZE)
 987                                 recip_dy = fix_recip[dy];
 988                         else
 989                                 recip_dy = F1_0/dy;
 990
 991                         dx_dy_left = compute_dx_dy(t,vlt,vlb, recip_dy);
 992
 993                         xleft = v3d[vlt].x2d;
 994                         uleft = v3d[vlt].u;
 995                         vleft = v3d[vlt].v;
 996                         lleft = v3d[vlt].l;
 997
 998                         du_dy_left = compute_du_dy_lin(t,vlt,vlb, recip_dy);
 999                         dv_dy_left = compute_dv_dy_lin(t,vlt,vlb, recip_dy);
1000
1001                         if (Lighting_enabled) {
1002                                 dl_dy_left = compute_dl_dy_lin(t,vlt,vlb, recip_dy);
1003                                 lleft = v3d[vlt].l;
1004                         }
1005                 }
1006
1007                 // See if we have reached the end of the current left edge, and if so, set
1008                 // new values for dx_dy and x.  Not necessary to set new values for u,v.
1009                 if (y == next_break_right) {
1010                         fix     recip_dy;
1011
1012                         while (y == f2i(v3d[vrb].y2d)) {
1013                                 vrt = vrb;
1014                                 vrb = succmod(vrb,t->nv);
1015                         }
1016
1017                         dy = f2i(t->verts[vrb].y2d) - f2i(t->verts[vrt].y2d);
1018                         if (dy < FIX_RECIP_TABLE_SIZE)
1019                                 recip_dy = fix_recip[dy];
1020                         else
1021                                 recip_dy = F1_0/dy;
1022
1023                         next_break_right = f2i(v3d[vrb].y2d);
1024                         dx_dy_right = compute_dx_dy(t,vrt,vrb, recip_dy);
1025
1026                         xright = v3d[vrt].x2d;
1027                         uright = v3d[vrt].u;
1028                         vright = v3d[vrt].v;
1029
1030                         du_dy_right = compute_du_dy_lin(t,vrt,vrb, recip_dy);
1031                         dv_dy_right = compute_dv_dy_lin(t,vrt,vrb, recip_dy);
1032
1033                         if (Lighting_enabled) {
1034                                 dl_dy_right = compute_dl_dy_lin(t,vrt,vrb, recip_dy);
1035                                 lright = v3d[vrt].l;
1036                         }
1037                 }
1038
1039                 if (Lighting_enabled) {
1040                         ntmap_scanline_lighted_linear(srcb,y,xleft,xright,uleft,uright,vleft,vright,lleft,lright);
1041                         lleft += dl_dy_left;
1042                         lright += dl_dy_right;
1043                 } else
1044                         ntmap_scanline_lighted_linear(srcb,y,xleft,xright,uleft,uright,vleft,vright,lleft,lright);
1045
1046                 uleft += du_dy_left;
1047                 vleft += dv_dy_left;
1048
1049                 uright += du_dy_right;
1050                 vright += dv_dy_right;
1051
1052                 xleft += dx_dy_left;
1053                 xright += dx_dy_right;
1054
1055         }
1056
1057         // We can get lleft or lright out of bounds here because we compute dl_dy using fixed point values,
1058         //      but we plot an integer number of scanlines, therefore doing an integer number of additions of the delta.
1059
1060         ntmap_scanline_lighted_linear(srcb,y,xleft,xright,uleft,uright,vleft,vright,lleft,lright);
1061 }
1062
1063 // fix  DivNum = F1_0*12;
1064
1065 extern void draw_tmap_flat(grs_bitmap *bp,int nverts,g3s_point **vertbuf);
1066
1067 // -------------------------------------------------------------------------------------
1068 // Interface from Matt's data structures to Mike's texture mapper.
1069 // -------------------------------------------------------------------------------------
1070 void draw_tmap(grs_bitmap *bp,int nverts,g3s_point **vertbuf)
1071 {
1072         int     i;
1073
1074         //      These variables are used in system which renders texture maps which lie on one scanline as a line.
1075         // fix  div_numerator;
1076         int     lighting_on_save = Lighting_on;
1077
1078         Assert(nverts <= MAX_TMAP_VERTS);
1079
1080
1081 #ifdef USE_MULT_CODE
1082         if ( !divide_table_filled ) fill_divide_table();
1083 #endif
1084
1085         // -- now called from g3_start_frame -- init_interface_vars_to_assembler();
1086
1087         //      If no transparency and seg depth is large, render as flat shaded.
1088         if ((Current_seg_depth > Max_linear_depth) && ((bp->bm_flags & 3) == 0)) {
1089                 draw_tmap_flat(bp, nverts, vertbuf);
1090                 return;
1091         }
1092
1093         if ( bp->bm_flags & BM_FLAG_RLE )
1094                 bp = rle_expand_texture( bp );          // Expand if rle'd
1095
1096         Transparency_on = bp->bm_flags & BM_FLAG_TRANSPARENT;
1097         if (bp->bm_flags & BM_FLAG_NO_LIGHTING)
1098                 Lighting_on = 0;
1099
1100
1101         // Setup texture map in Tmap1
1102         Tmap1.nv = nverts;                                              // Initialize number of vertices
1103
1104 //      div_numerator = DivNum; //f1_0*3;
1105
1106         for (i=0; i<nverts; i++) {
1107                 g3ds_vertex     *tvp = &Tmap1.verts[i];
1108                 g3s_point       *vp = vertbuf[i];
1109
1110                 tvp->x2d = vp->p3_sx;
1111                 tvp->y2d = vp->p3_sy;
1112
1113                 //      Check for overflow on fixdiv.  Will overflow on vp->z <= something small.  Allow only as low as 256.
1114                 if (vp->p3_z < 256) {
1115                         vp->p3_z = 256;
1116                         // Int3();              // we would overflow if we divided!
1117                 }
1118
1119                 tvp->z = fixdiv(F1_0*12, vp->p3_z);
1120                 tvp->u = vp->p3_u << 6; //* bp->bm_w;
1121                 tvp->v = vp->p3_v << 6; //* bp->bm_h;
1122
1123                 Assert(Lighting_on < 3);
1124
1125                 if (Lighting_on)
1126                         tvp->l = vp->p3_l * NUM_LIGHTING_LEVELS;
1127         }
1128
1129
1130         Lighting_enabled = Lighting_on;
1131
1132         // Now, call my texture mapper.
1133         if (Lighting_on) {
1134                 switch (Interpolation_method) { // 0 = choose, 1 = linear, 2 = /8 perspective, 3 = full perspective
1135                         case 0:                                                         // choose best interpolation
1136                                 per2_flag = 1;
1137                                 if (Current_seg_depth > Max_perspective_depth)
1138                                         ntexture_map_lighted_linear(bp, &Tmap1);
1139                                 else
1140                                         ntexture_map_lighted(bp, &Tmap1);
1141                                 break;
1142                         case 1:                                                         // linear interpolation
1143                                 per2_flag = 1;
1144                                 ntexture_map_lighted_linear(bp, &Tmap1);
1145                                 break;
1146                         case 2:                                                         // perspective every 8th pixel interpolation
1147                                 per2_flag = 1;
1148                                 ntexture_map_lighted(bp, &Tmap1);
1149                                 break;
1150                         case 3:                                                         // perspective every pixel interpolation
1151                                 per2_flag = 0;                                  // this hack means do divide every pixel
1152                                 ntexture_map_lighted(bp, &Tmap1);
1153                                 break;
1154                         default:
1155                                 Assert(0);                              // Illegal value for Interpolation_method, must be 0,1,2,3
1156                 }
1157         } else {
1158                 switch (Interpolation_method) { // 0 = choose, 1 = linear, 2 = /8 perspective, 3 = full perspective
1159                         case 0:                                                         // choose best interpolation
1160                                 per2_flag = 1;
1161                                 if (Current_seg_depth > Max_perspective_depth)
1162                                         ntexture_map_lighted_linear(bp, &Tmap1);
1163                                 else
1164                                         ntexture_map_lighted(bp, &Tmap1);
1165                                 break;
1166                         case 1:                                                         // linear interpolation
1167                                 per2_flag = 1;
1168                                 ntexture_map_lighted_linear(bp, &Tmap1);
1169                                 break;
1170                         case 2:                                                         // perspective every 8th pixel interpolation
1171                                 per2_flag = 1;
1172                                 ntexture_map_lighted(bp, &Tmap1);
1173                                 break;
1174                         case 3:                                                         // perspective every pixel interpolation
1175                                 per2_flag = 0;                                  // this hack means do divide every pixel
1176                                 ntexture_map_lighted(bp, &Tmap1);
1177                                 break;
1178                         default:
1179                                 Assert(0);                              // Illegal value for Interpolation_method, must be 0,1,2,3
1180                 }
1181         }
1182
1183         Lighting_on = lighting_on_save;
1184
1185 }
1186