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