main/render.c

   1 /* $Id: render.c,v 1.18 2003-10-10 09:36:35 btb Exp $ */
   2 /*
   3 THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
   4 SOFTWARE CORPORATION ("PARALLAX").  PARALLAX, IN DISTRIBUTING THE CODE TO
   5 END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
   6 ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
   7 IN USING, DISPLAYING,  AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
   8 SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
   9 FREE PURPOSES.  IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
  10 CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES.  THE END-USER UNDERSTANDS
  11 AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
  12 COPYRIGHT 1993-1999 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
  13 */
  14
  15 /*
  16  *
  17  * Rendering Stuff
  18  *
  19  * Old Log:
  20  * Revision 1.9  1995/11/20  17:17:48  allender
  21  * *** empty log message ***
  22  *
  23  * Revision 1.8  1995/10/26  14:08:35  allender
  24  * added assigment for physics optimization
  25  *
  26  * Revision 1.7  1995/09/22  14:28:46  allender
  27  * changed render_zoom to make game match PC aspect
  28  *
  29  * Revision 1.6  1995/08/14  14:35:54  allender
  30  * change transparency to 0
  31  *
  32  * Revision 1.5  1995/08/12  11:32:02  allender
  33  * removed #ifdef NEWDEMO -- always in
  34  *
  35  * Revision 1.4  1995/07/05  16:48:31  allender
  36  * kitchen stuff
  37  *
  38  * Revision 1.3  1995/06/23  10:22:54  allender
  39  * fix outline mode
  40  *
  41  * Revision 1.2  1995/06/16  16:11:18  allender
  42  * changed sort func to accept const parameters
  43  *
  44  * Revision 1.1  1995/05/16  15:30:24  allender
  45  * Initial revision
  46  *
  47  * Revision 2.5  1995/12/19  15:31:36  john
  48  * Made stereo mode only record 1 eye in demo.
  49  *
  50  * Revision 2.4  1995/03/20  18:15:53  john
  51  * Added code to not store the normals in the segment structure.
  52  *
  53  * Revision 2.3  1995/03/13  16:11:05  john
  54  * Maybe fixed bug that lighting didn't work with vr helmets.
  55  *
  56  * Revision 2.2  1995/03/09  15:33:49  john
  57  * Fixed bug with iglasses timeout too long, and objects
  58  * disappearing from left eye.
  59  *
  60  * Revision 2.1  1995/03/06  15:23:59  john
  61  * New screen techniques.
  62  *
  63  * Revision 2.0  1995/02/27  11:31:01  john
  64  * New version 2.0, which has no anonymous unions, builds with
  65  * Watcom 10.0, and doesn't require parsing BITMAPS.TBL.
  66  *
  67  * Revision 1.252  1995/02/22  13:49:38  allender
  68  * remove anonymous unions from object structure
  69  *
  70  * Revision 1.251  1995/02/11  15:07:26  matt
  71  * Took out code which was mostly intended as part of a larger renderer
  72  * change which never happened.  This new code was causing problems with
  73  * the level 4 control center.
  74  *
  75  * Revision 1.250  1995/02/07  16:28:53  matt
  76  * Fixed problem with new code
  77  *
  78  * Revision 1.249  1995/02/06  14:38:58  matt
  79  * Took out some code that didn't compile when editor in
  80  *
  81  * Revision 1.248  1995/02/06  13:45:25  matt
  82  * Structural changes, plus small sorting improvements
  83  *
  84  * Revision 1.247  1995/02/02  15:59:26  matt
  85  * Changed assert to int3.
  86  *
  87  * Revision 1.246  1995/02/01  21:02:27  matt
  88  * Added partial fix for rendering bugs
  89  * Ripped out laser hack system
  90  *
  91  * Revision 1.245  1995/01/20  15:14:30  matt
  92  * Added parens to fix precedence bug
  93  *
  94  * Revision 1.244  1995/01/14  19:16:59  john
  95  * First version of new bitmap paging code.
  96  *
  97  * Revision 1.243  1995/01/03  20:19:25  john
  98  * Pretty good working version of game save.
  99  *
 100  * Revision 1.242  1994/12/29  13:51:05  john
 101  * Made the floating reticle draw in the spot
 102  * regardless of the eye offset.
 103  *
 104  * Revision 1.241  1994/12/23  15:02:55  john
 105  * Tweaked floating reticle.
 106  *
 107  * Revision 1.240  1994/12/23  14:27:45  john
 108  * Changed offset of floating reticle to line up with
 109  * lasers a bit better.
 110  *
 111  * Revision 1.239  1994/12/23  14:22:50  john
 112  * Added floating reticle for VR helments.
 113  *
 114  * Revision 1.238  1994/12/13  14:07:50  matt
 115  * Fixed tmap_num2 bug in search mode
 116  *
 117  * Revision 1.237  1994/12/11  00:45:53  matt
 118  * Fixed problem when object sort buffer got full
 119  *
 120  * Revision 1.236  1994/12/09  18:46:06  matt
 121  * Added a little debugging
 122  *
 123  * Revision 1.235  1994/12/09  14:59:16  matt
 124  * Added system to attach a fireball to another object for rendering purposes,
 125  * so the fireball always renders on top of (after) the object.
 126  *
 127  * Revision 1.234  1994/12/08  15:46:54  matt
 128  * Fixed buffer overflow that caused seg depth screwup
 129  *
 130  * Revision 1.233  1994/12/08  11:51:53  matt
 131  * Took out some unused stuff
 132  *
 133  * Revision 1.232  1994/12/06  16:31:48  mike
 134  * fix detriangulation problems.
 135  *
 136  * Revision 1.231  1994/12/05  15:32:51  matt
 137  * Changed an assert to an int3 & return
 138  *
 139  * Revision 1.230  1994/12/04  17:28:04  matt
 140  * Got rid of unused no_render_flag array, and took out box clear when searching
 141  *
 142  * Revision 1.229  1994/12/04  15:51:14  matt
 143  * Fixed linear tmap transition for objects
 144  *
 145  * Revision 1.228  1994/12/03  20:16:50  matt
 146  * Turn off window clip for objects
 147  *
 148  * Revision 1.227  1994/12/03  14:48:00  matt
 149  * Restored some default settings
 150  *
 151  * Revision 1.226  1994/12/03  14:44:32  matt
 152  * Fixed another difficult bug in the window clip system
 153  *
 154  * Revision 1.225  1994/12/02  13:19:56  matt
 155  * Fixed rect clears at terminus of rendering
 156  * Made a bunch of debug code compile out
 157  *
 158  * Revision 1.224  1994/12/02  11:58:21  matt
 159  * Fixed window clip bug
 160  *
 161  * Revision 1.223  1994/11/28  21:50:42  mike
 162  * optimizations.
 163  *
 164  * Revision 1.222  1994/11/28  01:32:15  mike
 165  * turn off window clearing.
 166  *
 167  * Revision 1.221  1994/11/27  23:11:52  matt
 168  * Made changes for new mprintf calling convention
 169  *
 170  * Revision 1.220  1994/11/20  15:58:55  matt
 171  * Don't migrate the control center, since it doesn't move out of its segment
 172  *
 173  * Revision 1.219  1994/11/19  23:54:36  mike
 174  * change window colors.
 175  *
 176  * Revision 1.218  1994/11/19  15:20:25  mike
 177  * rip out unused code and data
 178  *
 179  * Revision 1.217  1994/11/18  13:21:24  mike
 180  * Clear only view portals into rest of world based on value of Clear_window.
 181  *
 182  * Revision 1.216  1994/11/15  17:02:10  matt
 183  * Re-added accidentally deleted variable
 184  *
 185  * Revision 1.215  1994/11/15  16:51:50  matt
 186  * Made rear view only switch to rear cockpit if cockpit on in front view
 187  *
 188  * Revision 1.214  1994/11/14  20:47:57  john
 189  * Attempted to strip out all the code in the game
 190  * directory that uses any ui code.
 191  *
 192  * Revision 1.213  1994/11/11  15:37:07  mike
 193  * write orange for background to show render bugs.
 194  *
 195  * Revision 1.212  1994/11/09  22:57:18  matt
 196  * Keep tract of depth of segments rendered, for detail level optimization
 197  *
 198  * Revision 1.211  1994/11/01  23:40:14  matt
 199  * Elegantly handler buffer getting full
 200  *
 201  * Revision 1.210  1994/10/31  22:28:13  mike
 202  * Fix detriangulation bug.
 203  *
 204  * Revision 1.209  1994/10/31  11:48:56  mike
 205  * Optimize detriangulation, speedup of about 4% in many cases, 0% in many.
 206  *
 207  * Revision 1.208  1994/10/30  20:08:34  matt
 208  * For endlevel: added big explosion at tunnel exit; made lights in tunnel
 209  * go out; made more explosions on walls.
 210  *
 211  * Revision 1.207  1994/10/27  14:14:35  matt
 212  * Don't do light flash during endlevel sequence
 213  *
 214  * Revision 1.206  1994/10/11  12:05:42  mike
 215  * Improve detriangulation.
 216  *
 217  * Revision 1.205  1994/10/07  15:27:00  john
 218  * Commented out the code that moves your eye
 219  * forward.
 220  *
 221  * Revision 1.204  1994/10/05  16:07:38  mike
 222  * Don't detriangulate sides if in player's segment.  Prevents player going behind a wall,
 223  * though there are cases in which it would be ok to detriangulate these.
 224  *
 225  * Revision 1.203  1994/10/03  12:44:05  matt
 226  * Took out unreferenced code
 227  *
 228  * Revision 1.202  1994/09/28  14:08:45  john
 229  * Added Zoom stuff back in, but ifdef'd it out.
 230  *
 231  * Revision 1.201  1994/09/25  23:41:49  matt
 232  * Changed the object load & save code to read/write the structure fields one
 233  * at a time (rather than the whole structure at once).  This mean that the
 234  * object structure can be changed without breaking the load/save functions.
 235  * As a result of this change, the local_object data can be and has been
 236  * incorporated into the object array.  Also, timeleft is now a property
 237  * of all objects, and the object structure has been otherwise cleaned up.
 238  *
 239  * Revision 1.200  1994/09/25  15:50:10  mike
 240  * Integrate my debug changes which shows how many textures were rendered
 241  * this frame.
 242  *
 243  * Revision 1.199  1994/09/25  15:45:22  matt
 244  * Added OBJ_LIGHT, a type of object that casts light
 245  * Added generalized lifeleft, and moved it to local_object
 246  *
 247  * Revision 1.198  1994/09/15  21:23:32  matt
 248  * Changed system to keep track of whether & what cockpit is up
 249  *
 250  * Revision 1.197  1994/09/15  16:30:12  mike
 251  * Comment out call to object_render_targets, which did nothing.
 252  *
 253  * Revision 1.196  1994/09/07  22:25:51  matt
 254  * Don't migrate through semi-transparent walls
 255  *
 256  * Revision 1.195  1994/09/07  19:16:21  mike
 257  * Homing missile.
 258  *
 259  * Revision 1.194  1994/08/31  20:54:17  matt
 260  * Don't do flash effect while whiting out
 261  *
 262  * Revision 1.193  1994/08/23  17:20:12  john
 263  * Added rear-view cockpit.
 264  *
 265  * Revision 1.192  1994/08/22  14:36:35  john
 266  * Made R key make a "reverse" view render.
 267  *
 268  * Revision 1.191  1994/08/19  20:09:26  matt
 269  * Added end-of-level cut scene with external scene
 270  *
 271  * Revision 1.190  1994/08/10  19:56:17  john
 272  * Changed font stuff; Took out old menu; messed up lots of
 273  * other stuff like game sequencing messages, etc.
 274  *
 275  * Revision 1.189  1994/08/10  14:45:05  john
 276  * *** empty log message ***
 277  *
 278  * Revision 1.188  1994/08/09  16:04:06  john
 279  * Added network players to editor.
 280  *
 281  * Revision 1.187  1994/08/05  17:07:05  john
 282  * Made lasers be two objects, one drawing after the other
 283  * all the time.
 284  *
 285  * Revision 1.186  1994/08/05  10:07:57  matt
 286  * Disable window check checking (i.e., always use window check)
 287  *
 288  * Revision 1.185  1994/08/04  19:11:30  matt
 289  * Changed a bunch of vecmat calls to use multiple-function routines, and to
 290  * allow the use of C macros for some functions
 291  *
 292  * Revision 1.184  1994/08/04  00:21:14  matt
 293  * Cleaned up fvi & physics error handling; put in code to make sure objects
 294  * are in correct segment; simplified segment finding for objects and points
 295  *
 296  * Revision 1.183  1994/08/02  19:04:28  matt
 297  * Cleaned up vertex list functions
 298  *
 299  * Revision 1.182  1994/07/29  15:13:33  matt
 300  * When window check turned off, cut render depth in half
 301  *
 302  * Revision 1.181  1994/07/29  11:03:50  matt
 303  * Use highest_segment_index instead of num_segments so render works from
 304  * the editor
 305  *
 306  * Revision 1.180  1994/07/29  10:04:34  mike
 307  * Update Cursegp when an object is selected.
 308  *
 309  * Revision 1.179  1994/07/25  00:02:50  matt
 310  * Various changes to accomodate new 3d, which no longer takes point numbers
 311  * as parms, and now only takes pointers to points.
 312  *
 313  * Revision 1.178  1994/07/24  14:37:49  matt
 314  * Added angles for player head
 315  *
 316  * Revision 1.177  1994/07/20  19:08:07  matt
 317  * If in editor, don't move eye from center of viewer object
 318  *
 319  *
 320  */
 321
 322 #ifdef HAVE_CONFIG_H
 323 #include <conf.h>
 324 #endif
 325
 326 #include <stdlib.h>
 327 #include <stdio.h>
 328 #include <string.h>
 329
 330 #include "pa_enabl.h"                   //$$POLY_ACC
 331 #include "inferno.h"
 332 #include "segment.h"
 333 #include "error.h"
 334 #include "bm.h"
 335 #include "texmap.h"
 336 #include "mono.h"
 337 #include "render.h"
 338 #include "game.h"
 339 #include "object.h"
 340 #include "laser.h"
 341 #include "textures.h"
 342 #include "screens.h"
 343 #include "segpoint.h"
 344 #include "wall.h"
 345 #include "texmerge.h"
 346 #include "physics.h"
 347 #include "3d.h"
 348 #include "gameseg.h"
 349 #include "vclip.h"
 350 #include "lighting.h"
 351 #include "cntrlcen.h"
 352 #include "newdemo.h"
 353 #include "automap.h"
 354 #include "endlevel.h"
 355 #include "key.h"
 356 #include "newmenu.h"
 357 #include "u_mem.h"
 358 #include "piggy.h"
 359
 360 #ifdef OGL
 361 #include "ogl_init.h"
 362 #endif
 363
 364 #define INITIAL_LOCAL_LIGHT (F1_0/4)    // local light value in segment of occurence (of light emission)
 365
 366 #ifdef EDITOR
 367 #include "editor/editor.h"
 368 #endif
 369
 370 #if defined(POLY_ACC)
 371 #include "poly_acc.h"
 372 #endif
 373
 374 //used for checking if points have been rotated
 375 int     Clear_window_color=-1;
 376 int     Clear_window=2; // 1 = Clear whole background window, 2 = clear view portals into rest of world, 0 = no clear
 377
 378 int RL_framecount=-1;
 379 short Rotated_last[MAX_VERTICES];
 380
 381 // When any render function needs to know what's looking at it, it should
 382 // access Viewer members.
 383 object * Viewer = NULL;
 384
 385 vms_vector Viewer_eye;  //valid during render
 386
 387 int     N_render_segs;
 388
 389 #ifndef MACINTOSH
 390 fix Render_zoom = 0x9000;                                       //the player's zoom factor
 391 #else
 392 fix Render_zoom = 0xB000;
 393 #endif
 394
 395 #ifndef NDEBUG
 396 ubyte object_rendered[MAX_OBJECTS];
 397 #endif
 398
 399 #define DEFAULT_RENDER_DEPTH 16
 400 int Render_depth=DEFAULT_RENDER_DEPTH;          //how many segments deep to render
 401
 402 int     Detriangulation_on = 1;                                 // 1 = allow rendering of triangulated side as a quad, 0 = don't allow
 403
 404 #ifdef EDITOR
 405 int     Render_only_bottom=0;
 406 int     Bottom_bitmap_num = 9;
 407 #endif
 408
 409 fix     Face_reflectivity = (F1_0/2);
 410
 411 #if 0           //this stuff could probably just be deleted
 412
 413 int inc_render_depth(void)
 414 {
 415         return ++Render_depth;
 416 }
 417
 418 int dec_render_depth(void)
 419 {
 420         return Render_depth==1?Render_depth:--Render_depth;
 421 }
 422
 423 int reset_render_depth(void)
 424 {
 425         return Render_depth = DEFAULT_RENDER_DEPTH;
 426 }
 427
 428 #endif
 429
 430 #ifdef EDITOR
 431 int _search_mode = 0;                   //true if looking for curseg,side,face
 432 short _search_x,_search_y;      //pixel we're looking at
 433 int found_seg,found_side,found_face,found_poly;
 434 #else
 435 #define _search_mode 0
 436 #endif
 437
 438 #ifdef NDEBUG           //if no debug code, set these vars to constants
 439
 440 #define Outline_mode 0
 441 #define Show_only_curside 0
 442
 443 #else
 444
 445 int Outline_mode=0,Show_only_curside=0;
 446
 447 int toggle_outline_mode(void)
 448 {
 449         return Outline_mode = !Outline_mode;
 450 }
 451
 452 int toggle_show_only_curside(void)
 453 {
 454         return Show_only_curside = !Show_only_curside;
 455 }
 456
 457 void draw_outline(int nverts,g3s_point **pointlist)
 458 {
 459         int i;
 460
 461         gr_setcolor(BM_XRGB(63,63,63));
 462
 463         for (i=0;i<nverts-1;i++)
 464                 g3_draw_line(pointlist[i],pointlist[i+1]);
 465
 466         g3_draw_line(pointlist[i],pointlist[0]);
 467
 468 }
 469 #endif
 470
 471 grs_canvas * reticle_canvas = NULL;
 472
 473 void free_reticle_canvas()
 474 {
 475         if (reticle_canvas)     {
 476                 d_free( reticle_canvas->cv_bitmap.bm_data );
 477                 d_free( reticle_canvas );
 478                 reticle_canvas  = NULL;
 479         }
 480 }
 481
 482 extern void show_reticle(int force_big);
 483
 484 // Draw the reticle in 3D for head tracking
 485 void draw_3d_reticle(fix eye_offset)
 486 {
 487         g3s_point       reticle_points[4];
 488         g3s_uvl         uvl[4];
 489         g3s_point       *pointlist[4];
 490         int                     i;
 491         vms_vector v1, v2;
 492         grs_canvas *saved_canvas;
 493         int saved_interp_method;
 494
 495 //      if (!Use_player_head_angles) return;
 496
 497         for (i=0; i<4; i++ )    {
 498                 pointlist[i] = &reticle_points[i];
 499                 uvl[i].l = MAX_LIGHT;
 500         }
 501         uvl[0].u = 0; uvl[0].v = 0;
 502         uvl[1].u = F1_0; uvl[1].v = 0;
 503         uvl[2].u = F1_0; uvl[2].v = F1_0;
 504         uvl[3].u = 0; uvl[3].v = F1_0;
 505
 506         vm_vec_scale_add( &v1, &Viewer->pos, &Viewer->orient.fvec, F1_0*4 );
 507         vm_vec_scale_add2(&v1,&Viewer->orient.rvec,eye_offset);
 508
 509         vm_vec_scale_add( &v2, &v1, &Viewer->orient.rvec, -F1_0*1 );
 510         vm_vec_scale_add2( &v2, &Viewer->orient.uvec, F1_0*1 );
 511         g3_rotate_point(&reticle_points[0],&v2);
 512
 513         vm_vec_scale_add( &v2, &v1, &Viewer->orient.rvec, +F1_0*1 );
 514         vm_vec_scale_add2( &v2, &Viewer->orient.uvec, F1_0*1 );
 515         g3_rotate_point(&reticle_points[1],&v2);
 516
 517         vm_vec_scale_add( &v2, &v1, &Viewer->orient.rvec, +F1_0*1 );
 518         vm_vec_scale_add2( &v2, &Viewer->orient.uvec, -F1_0*1 );
 519         g3_rotate_point(&reticle_points[2],&v2);
 520
 521         vm_vec_scale_add( &v2, &v1, &Viewer->orient.rvec, -F1_0*1 );
 522         vm_vec_scale_add2( &v2, &Viewer->orient.uvec, -F1_0*1 );
 523         g3_rotate_point(&reticle_points[3],&v2);
 524
 525         if ( reticle_canvas == NULL )   {
 526                 reticle_canvas = gr_create_canvas(64,64);
 527                 if ( !reticle_canvas )
 528                         Error( "Couldn't malloc reticle_canvas" );
 529                 atexit( free_reticle_canvas );
 530                 reticle_canvas->cv_bitmap.bm_handle = 0;
 531                 reticle_canvas->cv_bitmap.bm_flags = BM_FLAG_TRANSPARENT;
 532         }
 533
 534         saved_canvas = grd_curcanv;
 535         gr_set_current_canvas(reticle_canvas);
 536         gr_clear_canvas( TRANSPARENCY_COLOR );          // Clear to Xparent
 537         show_reticle(1);
 538         gr_set_current_canvas(saved_canvas);
 539
 540         saved_interp_method=Interpolation_method;
 541         Interpolation_method    = 3;            // The best, albiet slowest.
 542         g3_draw_tmap(4,pointlist,uvl,&reticle_canvas->cv_bitmap);
 543         Interpolation_method    = saved_interp_method;
 544 }
 545
 546
 547 extern fix Seismic_tremor_magnitude;
 548
 549 fix flash_scale;
 550
 551 #define FLASH_CYCLE_RATE f1_0
 552
 553 fix Flash_rate = FLASH_CYCLE_RATE;
 554
 555 //cycle the flashing light for when mine destroyed
 556 void flash_frame()
 557 {
 558         static fixang flash_ang=0;
 559
 560         if (!Control_center_destroyed && !Seismic_tremor_magnitude)
 561                 return;
 562
 563         if (Endlevel_sequence)
 564                 return;
 565
 566         if (PaletteBlueAdd > 10 )               //whiting out
 567                 return;
 568
 569 //      flash_ang += fixmul(FLASH_CYCLE_RATE,FrameTime);
 570         if (Seismic_tremor_magnitude) {
 571                 fix     added_flash;
 572
 573                 added_flash = abs(Seismic_tremor_magnitude);
 574                 if (added_flash < F1_0)
 575                         added_flash *= 16;
 576
 577                 flash_ang += fixmul(Flash_rate, fixmul(FrameTime, added_flash+F1_0));
 578                 fix_fastsincos(flash_ang,&flash_scale,NULL);
 579                 flash_scale = (flash_scale + F1_0*3)/4; //      gets in range 0.5 to 1.0
 580         } else {
 581                 flash_ang += fixmul(Flash_rate,FrameTime);
 582                 fix_fastsincos(flash_ang,&flash_scale,NULL);
 583                 flash_scale = (flash_scale + f1_0)/2;
 584                 if (Difficulty_level == 0)
 585                         flash_scale = (flash_scale+F1_0*3)/4;
 586         }
 587
 588
 589 }
 590
 591 // ----------------------------------------------------------------------------
 592 //      Render a face.
 593 //      It would be nice to not have to pass in segnum and sidenum, but
 594 //      they are used for our hideously hacked in headlight system.
 595 //      vp is a pointer to vertex ids.
 596 //      tmap1, tmap2 are texture map ids.  tmap2 is the pasty one.
 597 void render_face(int segnum, int sidenum, int nv, short *vp, int tmap1, int tmap2, uvl *uvlp, int wid_flags)
 598 {
 599         // -- Using new headlight system...fix                  face_light;
 600         grs_bitmap  *bm;
 601 #ifdef OGL
 602         grs_bitmap  *bm2 = NULL;
 603 #endif
 604
 605         fix                     reflect;
 606         uvl                     uvl_copy[8];
 607         int                     i;
 608         g3s_point       *pointlist[8];
 609
 610         Assert(nv <= 8);
 611
 612         for (i=0; i<nv; i++) {
 613                 uvl_copy[i] = uvlp[i];
 614                 pointlist[i] = &Segment_points[vp[i]];
 615         }
 616
 617         //handle cloaked walls
 618         if (wid_flags & WID_CLOAKED_FLAG) {
 619                 int wall_num = Segments[segnum].sides[sidenum].wall_num;
 620                 Assert(wall_num != -1);
 621                 Gr_scanline_darkening_level = Walls[wall_num].cloak_value;
 622                 gr_setcolor(BM_XRGB(0,0,0));    //set to black (matters for s3)
 623
 624                 g3_draw_poly(nv,pointlist);             //draw as flat poly
 625
 626                 Gr_scanline_darkening_level = GR_FADE_LEVELS;
 627
 628                 return;
 629         }
 630
 631         // -- Using new headlight system...face_light = -vm_vec_dot(&Viewer->orient.fvec,norm);
 632
 633         if (tmap1 >= NumTextures) {
 634                 mprintf((0,"Invalid tmap number %d, NumTextures=%d, changing to 0\n",tmap1,NumTextures));
 635
 636         #ifndef RELEASE
 637                 Int3();
 638         #endif
 639
 640                 Segments[segnum].sides[sidenum].tmap_num = 0;
 641         }
 642
 643 #ifdef OGL
 644         if (ogl_alttexmerge){
 645                 PIGGY_PAGE_IN(Textures[tmap1]);
 646                 bm = &GameBitmaps[Textures[tmap1].index];
 647                 if (tmap2){
 648                         PIGGY_PAGE_IN(Textures[tmap2&0x3FFF]);
 649                         bm2 = &GameBitmaps[Textures[tmap2&0x3FFF].index];
 650                 }
 651                 if (bm2 && (bm2->bm_flags&BM_FLAG_SUPER_TRANSPARENT)){
 652                         bm = texmerge_get_cached_bitmap( tmap1, tmap2 );
 653                         bm2 = NULL;
 654                 }
 655         } else
 656 #endif
 657
 658                 // New code for overlapping textures...
 659                 if (tmap2 != 0) {
 660                         bm = texmerge_get_cached_bitmap( tmap1, tmap2 );
 661                 } else {
 662                         bm = &GameBitmaps[Textures[tmap1].index];
 663                         PIGGY_PAGE_IN(Textures[tmap1]);
 664                 }
 665
 666         Assert( !(bm->bm_flags & BM_FLAG_PAGED_OUT) );
 667
 668         //reflect = fl2f((1.0-TmapInfo[p->tmap_num].reflect)/2.0 + 0.5);
 669         //reflect = fl2f((1.0-TmapInfo[p->tmap_num].reflect));
 670
 671         reflect = Face_reflectivity;            // f1_0;        //until we figure this stuff out...
 672
 673         //set light values for each vertex & build pointlist
 674         {
 675                 int i;
 676
 677                 // -- Using new headlight system...face_light = fixmul(face_light,reflect);
 678
 679                 for (i=0;i<nv;i++) {
 680
 681                         //the uvl struct has static light already in it
 682
 683                         //scale static light for destruction effect
 684                         if (Control_center_destroyed || Seismic_tremor_magnitude)       //make lights flash
 685                                 uvl_copy[i].l = fixmul(flash_scale,uvl_copy[i].l);
 686
 687                         //add in dynamic light (from explosions, etc.)
 688                         uvl_copy[i].l += Dynamic_light[vp[i]];
 689
 690                         //add in light from player's headlight
 691                         // -- Using new headlight system...uvl_copy[i].l += compute_headlight_light(&Segment_points[vp[i]].p3_vec,face_light);
 692
 693                         //saturate at max value
 694                         if (uvl_copy[i].l > MAX_LIGHT)
 695                                 uvl_copy[i].l = MAX_LIGHT;
 696
 697                 }
 698         }
 699
 700 #ifdef EDITOR
 701         if ((Render_only_bottom) && (sidenum == WBOTTOM))
 702                 g3_draw_tmap(nv,pointlist,(g3s_uvl *) uvl_copy,&GameBitmaps[Textures[Bottom_bitmap_num].index]);
 703         else
 704 #endif
 705
 706 #ifdef OGL
 707                 if (bm2){
 708                         g3_draw_tmap_2(nv,pointlist,(g3s_uvl *) uvl_copy,bm,bm2,((tmap2&0xC000)>>14) & 3);
 709                 }else
 710 #endif
 711                         g3_draw_tmap(nv,pointlist,(g3s_uvl *) uvl_copy,bm);
 712
 713 #ifndef NDEBUG
 714         if (Outline_mode) draw_outline(nv, pointlist);
 715 #endif
 716 }
 717
 718 #ifdef EDITOR
 719 // ----------------------------------------------------------------------------
 720 //      Only called if editor active.
 721 //      Used to determine which face was clicked on.
 722 void check_face(int segnum, int sidenum, int facenum, int nv, short *vp, int tmap1, int tmap2, uvl *uvlp)
 723 {
 724         int     i;
 725
 726         if (_search_mode) {
 727                 int save_lighting;
 728                 grs_bitmap *bm;
 729                 uvl uvl_copy[8];
 730                 g3s_point *pointlist[4];
 731
 732                 if (tmap2 > 0 )
 733                         bm = texmerge_get_cached_bitmap( tmap1, tmap2 );
 734                 else
 735                         bm = &GameBitmaps[Textures[tmap1].index];
 736
 737                 for (i=0; i<nv; i++) {
 738                         uvl_copy[i] = uvlp[i];
 739                         pointlist[i] = &Segment_points[vp[i]];
 740                 }
 741
 742                 gr_setcolor(0);
 743                 gr_pixel(_search_x,_search_y);  //set our search pixel to color zero
 744                 gr_setcolor(1);                                 //and render in color one
 745  save_lighting = Lighting_on;
 746  Lighting_on = 2;
 747                 //g3_draw_poly(nv,vp);
 748                 g3_draw_tmap(nv,pointlist, (g3s_uvl *)uvl_copy, bm);
 749  Lighting_on = save_lighting;
 750
 751                 if (gr_ugpixel(&grd_curcanv->cv_bitmap,_search_x,_search_y) == 1) {
 752                         found_seg = segnum;
 753                         found_side = sidenum;
 754                         found_face = facenum;
 755                 }
 756         }
 757 }
 758 #endif
 759
 760 fix     Tulate_min_dot = (F1_0/4);
 761 //--unused-- fix        Tulate_min_ratio = (2*F1_0);
 762 fix     Min_n0_n1_dot   = (F1_0*15/16);
 763
 764 extern int contains_flare(segment *segp, int sidenum);
 765 extern fix      Obj_light_xlate[16];
 766
 767 // -----------------------------------------------------------------------------------
 768 //      Render a side.
 769 //      Check for normal facing.  If so, render faces on side dictated by sidep->type.
 770 void render_side(segment *segp, int sidenum)
 771 {
 772         short                   vertnum_list[4];
 773         side                    *sidep = &segp->sides[sidenum];
 774         vms_vector      tvec;
 775         fix                     v_dot_n0, v_dot_n1;
 776         uvl                     temp_uvls[3];
 777         fix                     min_dot, max_dot;
 778         vms_vector  normals[2];
 779         int                     wid_flags;
 780
 781
 782         wid_flags = WALL_IS_DOORWAY(segp,sidenum);
 783
 784         if (!(wid_flags & WID_RENDER_FLAG))             //if (WALL_IS_DOORWAY(segp, sidenum) == WID_NO_WALL)
 785                 return;
 786
 787 #ifdef COMPACT_SEGS
 788         get_side_normals(segp, sidenum, &normals[0], &normals[1] );
 789 #else
 790         normals[0] = segp->sides[sidenum].normals[0];
 791         normals[1] = segp->sides[sidenum].normals[1];
 792 #endif
 793
 794         //      ========== Mark: Here is the change...beginning here: ==========
 795
 796         if (sidep->type == SIDE_IS_QUAD) {
 797
 798                 vm_vec_sub(&tvec, &Viewer_eye, &Vertices[segp->verts[Side_to_verts[sidenum][0]]]);
 799
 800                 // -- Old, slow way --  //      Regardless of whether this side is comprised of a single quad, or two triangles, we need to know one normal, so
 801                 // -- Old, slow way --  //      deal with it, get the dot product.
 802                 // -- Old, slow way --  if (sidep->type == SIDE_IS_TRI_13)
 803                 // -- Old, slow way --          vm_vec_normalized_dir(&tvec, &Viewer_eye, &Vertices[segp->verts[Side_to_verts[sidenum][1]]]);
 804                 // -- Old, slow way --  else
 805                 // -- Old, slow way --          vm_vec_normalized_dir(&tvec, &Viewer_eye, &Vertices[segp->verts[Side_to_verts[sidenum][0]]]);
 806
 807                 get_side_verts(vertnum_list,segp-Segments,sidenum);
 808                 v_dot_n0 = vm_vec_dot(&tvec, &normals[0]);
 809
 810 // -- flare creates point -- {
 811 // -- flare creates point --    int     flare_index;
 812 // -- flare creates point --
 813 // -- flare creates point --    flare_index = contains_flare(segp, sidenum);
 814 // -- flare creates point --
 815 // -- flare creates point --    if (flare_index != -1) {
 816 // -- flare creates point --            int                     tri;
 817 // -- flare creates point --            fix                     u, v, l;
 818 // -- flare creates point --            vms_vector      *hit_point;
 819 // -- flare creates point --            short                   vertnum_list[4];
 820 // -- flare creates point --
 821 // -- flare creates point --            hit_point = &Objects[flare_index].pos;
 822 // -- flare creates point --
 823 // -- flare creates point --            find_hitpoint_uv( &u, &v, &l, hit_point, segp, sidenum, 0);     //      last parm means always use face 0.
 824 // -- flare creates point --
 825 // -- flare creates point --            get_side_verts(vertnum_list, segp-Segments, sidenum);
 826 // -- flare creates point --
 827 // -- flare creates point --            g3_rotate_point(&Segment_points[MAX_VERTICES-1], hit_point);
 828 // -- flare creates point --
 829 // -- flare creates point --            for (tri=0; tri<4; tri++) {
 830 // -- flare creates point --                    short   tri_verts[3];
 831 // -- flare creates point --                    uvl     tri_uvls[3];
 832 // -- flare creates point --
 833 // -- flare creates point --                    tri_verts[0] = vertnum_list[tri];
 834 // -- flare creates point --                    tri_verts[1] = vertnum_list[(tri+1) % 4];
 835 // -- flare creates point --                    tri_verts[2] = MAX_VERTICES-1;
 836 // -- flare creates point --
 837 // -- flare creates point --                    tri_uvls[0] = sidep->uvls[tri];
 838 // -- flare creates point --                    tri_uvls[1] = sidep->uvls[(tri+1)%4];
 839 // -- flare creates point --                    tri_uvls[2].u = u;
 840 // -- flare creates point --                    tri_uvls[2].v = v;
 841 // -- flare creates point --                    tri_uvls[2].l = F1_0;
 842 // -- flare creates point --
 843 // -- flare creates point --                    render_face(segp-Segments, sidenum, 3, tri_verts, sidep->tmap_num, sidep->tmap_num2, tri_uvls, &normals[0]);
 844 // -- flare creates point --            }
 845 // -- flare creates point --
 846 // -- flare creates point --    return;
 847 // -- flare creates point --    }
 848 // -- flare creates point -- }
 849
 850                 if (v_dot_n0 >= 0) {
 851                         render_face(segp-Segments, sidenum, 4, vertnum_list, sidep->tmap_num, sidep->tmap_num2, sidep->uvls, wid_flags);
 852                         #ifdef EDITOR
 853                         check_face(segp-Segments, sidenum, 0, 4, vertnum_list, sidep->tmap_num, sidep->tmap_num2, sidep->uvls);
 854                         #endif
 855                 }
 856         } else {
 857                 //      Regardless of whether this side is comprised of a single quad, or two triangles, we need to know one normal, so
 858                 //      deal with it, get the dot product.
 859                 if (sidep->type == SIDE_IS_TRI_13)
 860                         vm_vec_normalized_dir_quick(&tvec, &Viewer_eye, &Vertices[segp->verts[Side_to_verts[sidenum][1]]]);
 861                 else
 862                         vm_vec_normalized_dir_quick(&tvec, &Viewer_eye, &Vertices[segp->verts[Side_to_verts[sidenum][0]]]);
 863
 864                 get_side_verts(vertnum_list,segp-Segments,sidenum);
 865
 866                 v_dot_n0 = vm_vec_dot(&tvec, &normals[0]);
 867
 868                 //      ========== Mark: The change ends here. ==========
 869
 870                 //      Although this side has been triangulated, because it is not planar, see if it is acceptable
 871                 //      to render it as a single quadrilateral.  This is a function of how far away the viewer is, how non-planar
 872                 //      the face is, how normal to the surfaces the view is.
 873                 //      Now, if both dot products are close to 1.0, then render two triangles as a single quad.
 874                 v_dot_n1 = vm_vec_dot(&tvec, &normals[1]);
 875
 876                 if (v_dot_n0 < v_dot_n1) {
 877                         min_dot = v_dot_n0;
 878                         max_dot = v_dot_n1;
 879                 } else {
 880                         min_dot = v_dot_n1;
 881                         max_dot = v_dot_n0;
 882                 }
 883
 884                 //      Determine whether to detriangulate side: (speed hack, assumes Tulate_min_ratio == F1_0*2, should fixmul(min_dot, Tulate_min_ratio))
 885                 if (Detriangulation_on && ((min_dot+F1_0/256 > max_dot) || ((Viewer->segnum != segp-Segments) &&  (min_dot > Tulate_min_dot) && (max_dot < min_dot*2)))) {
 886                         fix     n0_dot_n1;
 887
 888                         //      The other detriangulation code doesn't deal well with badly non-planar sides.
 889                         n0_dot_n1 = vm_vec_dot(&normals[0], &normals[1]);
 890                         if (n0_dot_n1 < Min_n0_n1_dot)
 891                                 goto im_so_ashamed;
 892
 893                         render_face(segp-Segments, sidenum, 4, vertnum_list, sidep->tmap_num, sidep->tmap_num2, sidep->uvls, wid_flags);
 894                         #ifdef EDITOR
 895                         check_face(segp-Segments, sidenum, 0, 4, vertnum_list, sidep->tmap_num, sidep->tmap_num2, sidep->uvls);
 896                         #endif
 897                 } else {
 898 im_so_ashamed: ;
 899                         if (sidep->type == SIDE_IS_TRI_02) {
 900                                 if (v_dot_n0 >= 0) {
 901                                         render_face(segp-Segments, sidenum, 3, vertnum_list, sidep->tmap_num, sidep->tmap_num2, sidep->uvls, wid_flags);
 902                                         #ifdef EDITOR
 903                                         check_face(segp-Segments, sidenum, 0, 3, vertnum_list, sidep->tmap_num, sidep->tmap_num2, sidep->uvls);
 904                                         #endif
 905                                 }
 906
 907                                 if (v_dot_n1 >= 0) {
 908                                         temp_uvls[0] = sidep->uvls[0];          temp_uvls[1] = sidep->uvls[2];          temp_uvls[2] = sidep->uvls[3];
 909                                         vertnum_list[1] = vertnum_list[2];      vertnum_list[2] = vertnum_list[3];      // want to render from vertices 0, 2, 3 on side
 910                                         render_face(segp-Segments, sidenum, 3, &vertnum_list[0], sidep->tmap_num, sidep->tmap_num2, temp_uvls, wid_flags);
 911                                         #ifdef EDITOR
 912                                         check_face(segp-Segments, sidenum, 1, 3, vertnum_list, sidep->tmap_num, sidep->tmap_num2, sidep->uvls);
 913                                         #endif
 914                                 }
 915                         } else if (sidep->type ==  SIDE_IS_TRI_13) {
 916                                 if (v_dot_n1 >= 0) {
 917                                         render_face(segp-Segments, sidenum, 3, &vertnum_list[1], sidep->tmap_num, sidep->tmap_num2, &sidep->uvls[1], wid_flags);        // rendering 1,2,3, so just skip 0
 918                                         #ifdef EDITOR
 919                                         check_face(segp-Segments, sidenum, 1, 3, &vertnum_list[1], sidep->tmap_num, sidep->tmap_num2, sidep->uvls);
 920                                         #endif
 921                                 }
 922
 923                                 if (v_dot_n0 >= 0) {
 924                                         temp_uvls[0] = sidep->uvls[0];          temp_uvls[1] = sidep->uvls[1];          temp_uvls[2] = sidep->uvls[3];
 925                                         vertnum_list[2] = vertnum_list[3];              // want to render from vertices 0,1,3
 926                                         render_face(segp-Segments, sidenum, 3, vertnum_list, sidep->tmap_num, sidep->tmap_num2, temp_uvls, wid_flags);
 927                                         #ifdef EDITOR
 928                                         check_face(segp-Segments, sidenum, 0, 3, vertnum_list, sidep->tmap_num, sidep->tmap_num2, sidep->uvls);
 929                                         #endif
 930                                 }
 931
 932                         } else
 933 #ifdef __DJGPP__
 934                                 Error("Illegal side type in render_side, type = %i, segment # = %li, side # = %i\n", sidep->type, segp-Segments, sidenum);
 935 #else
 936                                 Error("Illegal side type in render_side, type = %i, segment # = %i, side # = %i\n", sidep->type, segp-Segments, sidenum);
 937 #endif
 938                 }
 939         }
 940
 941 }
 942
 943 #ifdef EDITOR
 944 void render_object_search(object *obj)
 945 {
 946         int changed=0;
 947
 948         //note that we draw each pixel object twice, since we cannot control
 949         //what color the object draws in, so we try color 0, then color 1,
 950         //in case the object itself is rendering color 0
 951
 952         gr_setcolor(0);
 953         gr_pixel(_search_x,_search_y);  //set our search pixel to color zero
 954         render_object(obj);
 955         if (gr_ugpixel(&grd_curcanv->cv_bitmap,_search_x,_search_y) != 0)
 956                 changed=1;
 957
 958         gr_setcolor(1);
 959         gr_pixel(_search_x,_search_y);  //set our search pixel to color zero
 960         render_object(obj);
 961         if (gr_ugpixel(&grd_curcanv->cv_bitmap,_search_x,_search_y) != 1)
 962                 changed=1;
 963
 964         if (changed) {
 965                 if (obj->segnum != -1)
 966                         Cursegp = &Segments[obj->segnum];
 967                 found_seg = -(obj-Objects+1);
 968         }
 969 }
 970 #endif
 971
 972 extern ubyte DemoDoingRight,DemoDoingLeft;
 973
 974 void do_render_object(int objnum, int window_num)
 975 {
 976         #ifdef EDITOR
 977         int save_3d_outline=0;
 978         #endif
 979         object *obj = &Objects[objnum];
 980         int count = 0;
 981         int n;
 982
 983         Assert(objnum < MAX_OBJECTS);
 984
 985         #ifndef NDEBUG
 986         if (object_rendered[objnum]) {          //already rendered this...
 987                 Int3();         //get Matt!!!
 988                 return;
 989         }
 990
 991         object_rendered[objnum] = 1;
 992         #endif
 993
 994    if (Newdemo_state==ND_STATE_PLAYBACK)
 995          {
 996           if ((DemoDoingLeft==6 || DemoDoingRight==6) && Objects[objnum].type==OBJ_PLAYER)
 997                 {
 998                         // A nice fat hack: keeps the player ship from showing up in the
 999                         // small extra view when guiding a missile in the big window
1000
1001                         mprintf ((0,"Returning from render_object prematurely...\n"));
1002                         return;
1003                 }
1004          }
1005
1006         //      Added by MK on 09/07/94 (at about 5:28 pm, CDT, on a beautiful, sunny late summer day!) so
1007         //      that the guided missile system will know what objects to look at.
1008         //      I didn't know we had guided missiles before the release of D1. --MK
1009         if ((Objects[objnum].type == OBJ_ROBOT) || (Objects[objnum].type == OBJ_PLAYER)) {
1010                 //Assert(Window_rendered_data[window_num].rendered_objects < MAX_RENDERED_OBJECTS);
1011                 //      This peculiar piece of code makes us keep track of the most recently rendered objects, which
1012                 //      are probably the higher priority objects, without overflowing the buffer
1013                 if (Window_rendered_data[window_num].num_objects >= MAX_RENDERED_OBJECTS) {
1014                         Int3();
1015                         Window_rendered_data[window_num].num_objects /= 2;
1016                 }
1017                 Window_rendered_data[window_num].rendered_objects[Window_rendered_data[window_num].num_objects++] = objnum;
1018         }
1019
1020         if ((count++ > MAX_OBJECTS) || (obj->next == objnum)) {
1021                 Int3();                                 // infinite loop detected
1022                 obj->next = -1;         // won't this clean things up?
1023                 return;                                 // get out of this infinite loop!
1024         }
1025
1026                 //g3_draw_object(obj->class_id,&obj->pos,&obj->orient,obj->size);
1027
1028         //check for editor object
1029
1030         #ifdef EDITOR
1031         if (Function_mode==FMODE_EDITOR && objnum==Cur_object_index) {
1032                 save_3d_outline = g3d_interp_outline;
1033                 g3d_interp_outline=1;
1034         }
1035         #endif
1036
1037         #ifdef EDITOR
1038         if (_search_mode)
1039                 render_object_search(obj);
1040         else
1041         #endif
1042                 //NOTE LINK TO ABOVE
1043                 render_object(obj);
1044
1045         for (n=obj->attached_obj;n!=-1;n=Objects[n].ctype.expl_info.next_attach) {
1046
1047                 Assert(Objects[n].type == OBJ_FIREBALL);
1048                 Assert(Objects[n].control_type == CT_EXPLOSION);
1049                 Assert(Objects[n].flags & OF_ATTACHED);
1050
1051                 render_object(&Objects[n]);
1052         }
1053
1054
1055         #ifdef EDITOR
1056         if (Function_mode==FMODE_EDITOR && objnum==Cur_object_index)
1057                 g3d_interp_outline = save_3d_outline;
1058         #endif
1059
1060
1061         //DEBUG mprintf( (0, "%d ", objnum ));
1062
1063 }
1064
1065 #ifndef NDEBUG
1066 int     draw_boxes=0;
1067 int window_check=1,draw_edges=0,new_seg_sorting=1,pre_draw_segs=0;
1068 int no_migrate_segs=1,migrate_objects=1,behind_check=1;
1069 int check_window_check=0;
1070 #else
1071 #define draw_boxes                      0
1072 #define window_check                    1
1073 #define draw_edges                      0
1074 #define new_seg_sorting         1
1075 #define pre_draw_segs           0
1076 #define no_migrate_segs         1
1077 #define migrate_objects         1
1078 #define behind_check                    1
1079 #define check_window_check      0
1080 #endif
1081
1082 //increment counter for checking if points rotated
1083 //This must be called at the start of the frame if rotate_list() will be used
1084 void render_start_frame()
1085 {
1086         RL_framecount++;
1087
1088         if (RL_framecount==0) {         //wrap!
1089
1090                 memset(Rotated_last,0,sizeof(Rotated_last));            //clear all to zero
1091                 RL_framecount=1;                                                                                        //and set this frame to 1
1092         }
1093 }
1094
1095 //Given a lit of point numbers, rotate any that haven't been rotated this frame
1096 g3s_codes rotate_list(int nv,short *pointnumlist)
1097 {
1098         int i,pnum;
1099         g3s_point *pnt;
1100         g3s_codes cc;
1101
1102         cc.and = 0xff;  cc.or = 0;
1103
1104         for (i=0;i<nv;i++) {
1105
1106                 pnum = pointnumlist[i];
1107
1108                 pnt = &Segment_points[pnum];
1109
1110                 if (Rotated_last[pnum] != RL_framecount) {
1111
1112                         g3_rotate_point(pnt,&Vertices[pnum]);
1113
1114                         Rotated_last[pnum] = RL_framecount;
1115                 }
1116
1117                 cc.and &= pnt->p3_codes;
1118                 cc.or  |= pnt->p3_codes;
1119         }
1120
1121         return cc;
1122
1123 }
1124
1125 //Given a lit of point numbers, project any that haven't been projected
1126 void project_list(int nv,short *pointnumlist)
1127 {
1128         int i,pnum;
1129
1130         for (i=0;i<nv;i++) {
1131
1132                 pnum = pointnumlist[i];
1133
1134                 if (!(Segment_points[pnum].p3_flags & PF_PROJECTED))
1135
1136                         g3_project_point(&Segment_points[pnum]);
1137
1138         }
1139 }
1140
1141
1142 // -----------------------------------------------------------------------------------
1143 void render_segment(int segnum, int window_num)
1144 {
1145         segment         *seg = &Segments[segnum];
1146         g3s_codes       cc;
1147         int                     sn;
1148
1149         Assert(segnum!=-1 && segnum<=Highest_segment_index);
1150
1151         cc=rotate_list(8,seg->verts);
1152
1153         if (! cc.and) {         //all off screen?
1154
1155 //mprintf( (0, "!"));
1156                 //DEBUG mprintf( (0, "[Segment %d: ", segnum ));
1157
1158                 // set_segment_local_light_value(segnum,INITIAL_LOCAL_LIGHT);
1159
1160       if (Viewer->type!=OBJ_ROBOT)
1161                 Automap_visited[segnum]=1;
1162
1163                 for (sn=0; sn<MAX_SIDES_PER_SEGMENT; sn++)
1164                         render_side(seg, sn);
1165         }
1166
1167         //draw any objects that happen to be in this segment
1168
1169         //sort objects!
1170         //object_sort_segment_objects( seg );
1171
1172         #ifndef NDEBUG
1173         if (!migrate_objects) {
1174                 int objnum;
1175                 for (objnum=seg->objects;objnum!=-1;objnum=Objects[objnum].next)
1176                         do_render_object(objnum, window_num);
1177         }
1178         #endif
1179
1180         //DEBUG mprintf( (0, "]\n", segnum ));
1181
1182 }
1183
1184 // ----- This used to be called when Show_only_curside was set.
1185 // ----- It is wholly and superiorly replaced by render_side.
1186 // -- //render one side of one segment
1187 // -- void render_seg_side(segment *seg,int _side)
1188 // -- {
1189 // --   g3s_codes cc;
1190 // --   short vertnum_list[4];
1191 // --
1192 // --   cc=g3_rotate_list(8,&seg->verts);
1193 // --
1194 // --   if (! cc.and) {         //all off screen?
1195 // --           int fn,pn,i;
1196 // --           side *s;
1197 // --           face *f;
1198 // --           poly *p;
1199 // --
1200 // --           s=&seg->sides[_side];
1201 // --
1202 // --           for (f=s->faces,fn=s->num_faces;fn;fn--,f++)
1203 // --                   for (p=f->polys,pn=f->num_polys;pn;pn--,p++) {
1204 // --                           grs_bitmap *tmap;
1205 // --
1206 // --                           for (i=0;i<p->num_vertices;i++) vertnum_list[i] = seg->verts[p->verts[i]];
1207 // --
1208 // --                           if (p->tmap_num >= NumTextures) {
1209 // --                                   Warning("Invalid tmap number %d, NumTextures=%d\n...Changing in poly structure to tmap 0",p->tmap_num,NumTextures);
1210 // --                                   p->tmap_num = 0;                //change it permanantly
1211 // --                           }
1212 // --
1213 // --                           tmap = Textures[p->tmap_num];
1214 // --
1215 // --                           g3_check_and_draw_tmap(p->num_vertices,vertnum_list,(g3s_uvl *) &p->uvls,tmap,&f->normal);
1216 // --
1217 // --                           if (Outline_mode) draw_outline(p->num_vertices,vertnum_list);
1218 // --                   }
1219 // --           }
1220 // --
1221 // -- }
1222
1223 #define CROSS_WIDTH  i2f(8)
1224 #define CROSS_HEIGHT i2f(8)
1225
1226 #ifndef NDEBUG
1227
1228 //draw outline for curside
1229 void outline_seg_side(segment *seg,int _side,int edge,int vert)
1230 {
1231         g3s_codes cc;
1232
1233         cc=rotate_list(8,seg->verts);
1234
1235         if (! cc.and) {         //all off screen?
1236                 side *s;
1237                 g3s_point *pnt;
1238
1239                 s=&seg->sides[_side];
1240
1241                 //render curedge of curside of curseg in green
1242
1243                 gr_setcolor(BM_XRGB(0,63,0));
1244                 g3_draw_line(&Segment_points[seg->verts[Side_to_verts[_side][edge]]],&Segment_points[seg->verts[Side_to_verts[_side][(edge+1)%4]]]);
1245
1246                 //draw a little cross at the current vert
1247
1248                 pnt = &Segment_points[seg->verts[Side_to_verts[_side][vert]]];
1249
1250                 g3_project_point(pnt);          //make sure projected
1251
1252 //              gr_setcolor(BM_XRGB(0,0,63));
1253 //              gr_line(pnt->p3_sx-CROSS_WIDTH,pnt->p3_sy,pnt->p3_sx+CROSS_WIDTH,pnt->p3_sy);
1254 //              gr_line(pnt->p3_sx,pnt->p3_sy-CROSS_HEIGHT,pnt->p3_sx,pnt->p3_sy+CROSS_HEIGHT);
1255
1256                 gr_line(pnt->p3_sx-CROSS_WIDTH,pnt->p3_sy,pnt->p3_sx,pnt->p3_sy-CROSS_HEIGHT);
1257                 gr_line(pnt->p3_sx,pnt->p3_sy-CROSS_HEIGHT,pnt->p3_sx+CROSS_WIDTH,pnt->p3_sy);
1258                 gr_line(pnt->p3_sx+CROSS_WIDTH,pnt->p3_sy,pnt->p3_sx,pnt->p3_sy+CROSS_HEIGHT);
1259                 gr_line(pnt->p3_sx,pnt->p3_sy+CROSS_HEIGHT,pnt->p3_sx-CROSS_WIDTH,pnt->p3_sy);
1260         }
1261 }
1262
1263 #endif
1264
1265 #if 0           //this stuff could probably just be deleted
1266
1267 #define DEFAULT_PERSPECTIVE_DEPTH 6
1268
1269 int Perspective_depth=DEFAULT_PERSPECTIVE_DEPTH;        //how many levels deep to render in perspective
1270
1271 int inc_perspective_depth(void)
1272 {
1273         return ++Perspective_depth;
1274
1275 }
1276
1277 int dec_perspective_depth(void)
1278 {
1279         return Perspective_depth==1?Perspective_depth:--Perspective_depth;
1280
1281 }
1282
1283 int reset_perspective_depth(void)
1284 {
1285         return Perspective_depth = DEFAULT_PERSPECTIVE_DEPTH;
1286
1287 }
1288 #endif
1289
1290 typedef struct window {
1291         short left,top,right,bot;
1292 } window;
1293
1294 ubyte code_window_point(fix x,fix y,window *w)
1295 {
1296         ubyte code=0;
1297
1298         if (x <= w->left)  code |= 1;
1299         if (x >= w->right) code |= 2;
1300
1301         if (y <= w->top) code |= 4;
1302         if (y >= w->bot) code |= 8;
1303
1304         return code;
1305 }
1306
1307 #ifndef NDEBUG
1308 void draw_window_box(int color,short left,short top,short right,short bot)
1309 {
1310         short l,t,r,b;
1311
1312         gr_setcolor(color);
1313
1314         l=left; t=top; r=right; b=bot;
1315
1316         if ( r<0 || b<0 || l>=grd_curcanv->cv_bitmap.bm_w || (t>=grd_curcanv->cv_bitmap.bm_h && b>=grd_curcanv->cv_bitmap.bm_h))
1317                 return;
1318
1319         if (l<0) l=0;
1320         if (t<0) t=0;
1321         if (r>=grd_curcanv->cv_bitmap.bm_w) r=grd_curcanv->cv_bitmap.bm_w-1;
1322         if (b>=grd_curcanv->cv_bitmap.bm_h) b=grd_curcanv->cv_bitmap.bm_h-1;
1323
1324         gr_line(i2f(l),i2f(t),i2f(r),i2f(t));
1325         gr_line(i2f(r),i2f(t),i2f(r),i2f(b));
1326         gr_line(i2f(r),i2f(b),i2f(l),i2f(b));
1327         gr_line(i2f(l),i2f(b),i2f(l),i2f(t));
1328
1329 }
1330 #endif
1331
1332 int matt_find_connect_side(int seg0,int seg1);
1333
1334 #ifndef NDEBUG
1335 char visited2[MAX_SEGMENTS];
1336 #endif
1337
1338 unsigned char visited[MAX_SEGMENTS];
1339 short Render_list[MAX_RENDER_SEGS];
1340 short Seg_depth[MAX_RENDER_SEGS];               //depth for each seg in Render_list
1341 ubyte processed[MAX_RENDER_SEGS];               //whether each entry has been processed
1342 int     lcnt_save,scnt_save;
1343 //@@short *persp_ptr;
1344 short render_pos[MAX_SEGMENTS]; //where in render_list does this segment appear?
1345 //ubyte no_render_flag[MAX_RENDER_SEGS];
1346 window render_windows[MAX_RENDER_SEGS];
1347
1348 short render_obj_list[MAX_RENDER_SEGS+N_EXTRA_OBJ_LISTS][OBJS_PER_SEG];
1349
1350 //for objects
1351
1352
1353
1354 #define RED   BM_XRGB(63,0,0)
1355 #define WHITE BM_XRGB(63,63,63)
1356
1357 //Given two sides of segment, tell the two verts which form the
1358 //edge between them
1359 short Two_sides_to_edge[6][6][2] = {
1360         { {-1,-1}, {3,7}, {-1,-1}, {2,6}, {6,7}, {2,3} },
1361         { {3,7}, {-1,-1}, {0,4}, {-1,-1}, {4,7}, {0,3} },
1362         { {-1,-1}, {0,4}, {-1,-1}, {1,5}, {4,5}, {0,1} },
1363         { {2,6}, {-1,-1}, {1,5}, {-1,-1}, {5,6}, {1,2} },
1364         { {6,7}, {4,7}, {4,5}, {5,6}, {-1,-1}, {-1,-1} },
1365         { {2,3}, {0,3}, {0,1}, {1,2}, {-1,-1}, {-1,-1} }
1366 };
1367
1368 //given an edge specified by two verts, give the two sides on that edge
1369 int Edge_to_sides[8][8][2] = {
1370         { {-1,-1}, {2,5}, {-1,-1}, {1,5}, {1,2}, {-1,-1}, {-1,-1}, {-1,-1} },
1371         { {2,5}, {-1,-1}, {3,5}, {-1,-1}, {-1,-1}, {2,3}, {-1,-1}, {-1,-1} },
1372         { {-1,-1}, {3,5}, {-1,-1}, {0,5}, {-1,-1}, {-1,-1}, {0,3}, {-1,-1} },
1373         { {1,5}, {-1,-1}, {0,5}, {-1,-1}, {-1,-1}, {-1,-1}, {-1,-1}, {0,1} },
1374         { {1,2}, {-1,-1}, {-1,-1}, {-1,-1}, {-1,-1}, {2,4}, {-1,-1}, {1,4} },
1375         { {-1,-1}, {2,3}, {-1,-1}, {-1,-1}, {2,4}, {-1,-1}, {3,4}, {-1,-1} },
1376         { {-1,-1}, {-1,-1}, {0,3}, {-1,-1}, {-1,-1}, {3,4}, {-1,-1}, {0,4} },
1377         { {-1,-1}, {-1,-1}, {-1,-1}, {0,1}, {1,4}, {-1,-1}, {0,4}, {-1,-1} },
1378 };
1379
1380 //@@//perform simple check on tables
1381 //@@check_check()
1382 //@@{
1383 //@@    int i,j;
1384 //@@
1385 //@@    for (i=0;i<8;i++)
1386 //@@            for (j=0;j<8;j++)
1387 //@@                    Assert(Edge_to_sides[i][j][0] == Edge_to_sides[j][i][0] &&
1388 //@@                                    Edge_to_sides[i][j][1] == Edge_to_sides[j][i][1]);
1389 //@@
1390 //@@    for (i=0;i<6;i++)
1391 //@@            for (j=0;j<6;j++)
1392 //@@                    Assert(Two_sides_to_edge[i][j][0] == Two_sides_to_edge[j][i][0] &&
1393 //@@                                    Two_sides_to_edge[i][j][1] == Two_sides_to_edge[j][i][1]);
1394 //@@
1395 //@@
1396 //@@}
1397
1398
1399 //given an edge, tell what side is on that edge
1400 int find_seg_side(segment *seg,short *verts,int notside)
1401 {
1402         int i;
1403         int vv0=-1,vv1=-1;
1404         int side0,side1;
1405         int *eptr;
1406         int     v0,v1;
1407         short   *vp;
1408
1409 //@@    check_check();
1410
1411         v0 = verts[0];
1412         v1 = verts[1];
1413         vp = seg->verts;
1414
1415         for (i=0; i<8; i++) {
1416                 int svv = *vp++;        // seg->verts[i];
1417
1418                 if (vv0==-1 && svv == v0) {
1419                         vv0 = i;
1420                         if (vv1 != -1)
1421                                 break;
1422                 }
1423
1424                 if (vv1==-1 && svv == v1) {
1425                         vv1 = i;
1426                         if (vv0 != -1)
1427                                 break;
1428                 }
1429         }
1430
1431         Assert(vv0!=-1 && vv1!=-1);
1432
1433         eptr = Edge_to_sides[vv0][vv1];
1434
1435         side0 = eptr[0];
1436         side1 = eptr[1];
1437
1438         Assert(side0!=-1 && side1!=-1);
1439
1440         if (side0 != notside) {
1441                 Assert(side1==notside);
1442                 return side0;
1443         }
1444         else {
1445                 Assert(side0==notside);
1446                 return side1;
1447         }
1448
1449 }
1450
1451 //find the two segments that join a given seg though two sides, and
1452 //the sides of those segments the abut.
1453 int find_joining_side_norms(vms_vector *norm0_0,vms_vector *norm0_1,vms_vector *norm1_0,vms_vector *norm1_1,vms_vector **pnt0,vms_vector **pnt1,segment *seg,int s0,int s1)
1454 {
1455         segment *seg0,*seg1;
1456         short edge_verts[2];
1457         int notside0,notside1;
1458         int edgeside0,edgeside1;
1459
1460         Assert(s0!=-1 && s1!=-1);
1461
1462         seg0 = &Segments[seg->children[s0]];
1463         seg1 = &Segments[seg->children[s1]];
1464
1465         edge_verts[0] = seg->verts[Two_sides_to_edge[s0][s1][0]];
1466         edge_verts[1] = seg->verts[Two_sides_to_edge[s0][s1][1]];
1467
1468         Assert(edge_verts[0]!=-1 && edge_verts[1]!=-1);
1469
1470         notside0 = find_connect_side(seg,seg0);
1471         Assert(notside0 != -1);
1472         notside1 = find_connect_side(seg,seg1);
1473         Assert(notside1 != -1);
1474
1475         edgeside0 = find_seg_side(seg0,edge_verts,notside0);
1476         edgeside1 = find_seg_side(seg1,edge_verts,notside1);
1477
1478         //deal with the case where an edge is shared by more than two segments
1479
1480 //@@    if (IS_CHILD(seg0->children[edgeside0])) {
1481 //@@            segment *seg00;
1482 //@@            int notside00;
1483 //@@
1484 //@@            seg00 = &Segments[seg0->children[edgeside0]];
1485 //@@
1486 //@@            if (seg00 != seg1) {
1487 //@@
1488 //@@                    notside00 = find_connect_side(seg0,seg00);
1489 //@@                    Assert(notside00 != -1);
1490 //@@
1491 //@@                    edgeside0 = find_seg_side(seg00,edge_verts,notside00);
1492 //@@                    seg0 = seg00;
1493 //@@            }
1494 //@@
1495 //@@    }
1496 //@@
1497 //@@    if (IS_CHILD(seg1->children[edgeside1])) {
1498 //@@            segment *seg11;
1499 //@@            int notside11;
1500 //@@
1501 //@@            seg11 = &Segments[seg1->children[edgeside1]];
1502 //@@
1503 //@@            if (seg11 != seg0) {
1504 //@@                    notside11 = find_connect_side(seg1,seg11);
1505 //@@                    Assert(notside11 != -1);
1506 //@@
1507 //@@                    edgeside1 = find_seg_side(seg11,edge_verts,notside11);
1508 //@@                    seg1 = seg11;
1509 //@@            }
1510 //@@    }
1511
1512 //      if ( IS_CHILD(seg0->children[edgeside0]) ||
1513 //                IS_CHILD(seg1->children[edgeside1]))
1514 //              return 0;
1515
1516         #ifdef COMPACT_SEGS
1517                 get_side_normals(seg0, edgeside0, norm0_0, norm0_1 );
1518                 get_side_normals(seg1, edgeside1, norm1_0, norm1_1 );
1519         #else
1520                 *norm0_0 = seg0->sides[edgeside0].normals[0];
1521                 *norm0_1 = seg0->sides[edgeside0].normals[1];
1522                 *norm1_0 = seg1->sides[edgeside1].normals[0];
1523                 *norm1_1 = seg1->sides[edgeside1].normals[1];
1524         #endif
1525
1526         *pnt0 = &Vertices[seg0->verts[Side_to_verts[edgeside0][seg0->sides[edgeside0].type==3?1:0]]];
1527         *pnt1 = &Vertices[seg1->verts[Side_to_verts[edgeside1][seg1->sides[edgeside1].type==3?1:0]]];
1528
1529         return 1;
1530 }
1531
1532 //see if the order matters for these two children.
1533 //returns 0 if order doesn't matter, 1 if c0 before c1, -1 if c1 before c0
1534 int compare_children(segment *seg,short c0,short c1)
1535 {
1536         vms_vector norm0_0,norm0_1,*pnt0,temp;
1537         vms_vector norm1_0,norm1_1,*pnt1;
1538         fix d0_0,d0_1,d1_0,d1_1,d0,d1;
1539 int t;
1540
1541         if (Side_opposite[c0] == c1) return 0;
1542
1543         Assert(c0!=-1 && c1!=-1);
1544
1545         //find normals of adjoining sides
1546
1547         t = find_joining_side_norms(&norm0_0,&norm0_1,&norm1_0,&norm1_1,&pnt0,&pnt1,seg,c0,c1);
1548
1549 //if (!t)
1550 // return 0;
1551
1552         vm_vec_sub(&temp,&Viewer_eye,pnt0);
1553         d0_0 = vm_vec_dot(&norm0_0,&temp);
1554         d0_1 = vm_vec_dot(&norm0_1,&temp);
1555
1556         vm_vec_sub(&temp,&Viewer_eye,pnt1);
1557         d1_0 = vm_vec_dot(&norm1_0,&temp);
1558         d1_1 = vm_vec_dot(&norm1_1,&temp);
1559
1560         d0 = (d0_0 < 0 || d0_1 < 0)?-1:1;
1561         d1 = (d1_0 < 0 || d1_1 < 0)?-1:1;
1562
1563         if (d0 < 0 && d1 < 0)
1564                 return 0;
1565
1566         if (d0 < 0)
1567                 return 1;
1568         else if (d1 < 0)
1569                 return -1;
1570         else
1571                 return 0;
1572
1573 }
1574
1575 int ssc_total=0,ssc_swaps=0;
1576
1577 //short the children of segment to render in the correct order
1578 //returns non-zero if swaps were made
1579 int sort_seg_children(segment *seg,int n_children,short *child_list)
1580 {
1581         int i,j;
1582         int r;
1583         int made_swaps,count;
1584
1585         if (n_children == 0) return 0;
1586
1587  ssc_total++;
1588
1589         //for each child,  compare with other children and see if order matters
1590         //if order matters, fix if wrong
1591
1592         count = 0;
1593
1594         do {
1595                 made_swaps = 0;
1596
1597                 for (i=0;i<n_children-1;i++)
1598                         for (j=i+1;child_list[i]!=-1 && j<n_children;j++)
1599                                 if (child_list[j]!=-1) {
1600                                         r = compare_children(seg,child_list[i],child_list[j]);
1601
1602                                         if (r == 1) {
1603                                                 int temp = child_list[i];
1604                                                 child_list[i] = child_list[j];
1605                                                 child_list[j] = temp;
1606                                                 made_swaps=1;
1607                                         }
1608                                 }
1609
1610         } while (made_swaps && ++count<n_children);
1611
1612  if (count)
1613   ssc_swaps++;
1614
1615         return count;
1616 }
1617
1618 void add_obj_to_seglist(int objnum,int listnum)
1619 {
1620         int i,checkn,marker;
1621
1622         checkn = listnum;
1623
1624         //first, find a slot
1625
1626 //mprintf((0,"adding obj %d to %d",objnum,listnum));
1627
1628         do {
1629
1630                 for (i=0;render_obj_list[checkn][i] >= 0;i++);
1631
1632                 Assert(i < OBJS_PER_SEG);
1633
1634                 marker = render_obj_list[checkn][i];
1635
1636                 if (marker != -1) {
1637                         checkn = -marker;
1638                         //Assert(checkn < MAX_RENDER_SEGS+N_EXTRA_OBJ_LISTS);
1639                         if (checkn >= MAX_RENDER_SEGS+N_EXTRA_OBJ_LISTS) {
1640                                 Int3();
1641                                 return;
1642                         }
1643                 }
1644
1645         } while (marker != -1);
1646
1647 //mprintf((0,"  slot %d,%d",checkn,i));
1648
1649
1650         //now we have found a slot.  put object in it
1651
1652         if (i != OBJS_PER_SEG-1) {
1653
1654                 render_obj_list[checkn][i] = objnum;
1655                 render_obj_list[checkn][i+1] = -1;
1656         }
1657         else {                          //chain to additional list
1658                 int lookn;
1659
1660                 //find an available sublist
1661
1662                 for (lookn=MAX_RENDER_SEGS;render_obj_list[lookn][0]!=-1 && lookn<MAX_RENDER_SEGS+N_EXTRA_OBJ_LISTS;lookn++);
1663
1664                 //Assert(lookn<MAX_RENDER_SEGS+N_EXTRA_OBJ_LISTS);
1665                 if (lookn >= MAX_RENDER_SEGS+N_EXTRA_OBJ_LISTS) {
1666                         Int3();
1667                         return;
1668                 }
1669
1670                 render_obj_list[checkn][i] = -lookn;
1671                 render_obj_list[lookn][0] = objnum;
1672                 render_obj_list[lookn][1] = -1;
1673
1674         }
1675
1676 //mprintf((0,"  added!\n"));
1677
1678 }
1679 #ifdef __sun__
1680 // the following is a drop-in replacement for the broken libc qsort on solaris
1681 // taken from http://www.snippets.org/snippets/portable/RG_QSORT+C.php3
1682
1683 #define qsort qsort_dropin
1684
1685 /******************************************************************/
1686 /* qsort.c  --  Non-Recursive ANSI Quicksort function             */
1687 /* Public domain by Raymond Gardner, Englewood CO  February 1991  */
1688 /******************************************************************/
1689 #define  COMP(a, b)  ((*comp)((void *)(a), (void *)(b)))
1690 #define  T 7 // subfiles of <= T elements will be insertion sorteded (T >= 3)
1691 #define  SWAP(a, b)  (swap_bytes((char *)(a), (char *)(b), size))
1692
1693 static void swap_bytes(char *a, char *b, size_t nbytes)
1694 {
1695    char tmp;
1696    do {
1697       tmp = *a; *a++ = *b; *b++ = tmp;
1698    } while ( --nbytes );
1699 }
1700
1701 void qsort(void *basep, size_t nelems, size_t size,
1702                             int (*comp)(const void *, const void *))
1703 {
1704    char *stack[40], **sp;       /* stack and stack pointer        */
1705    char *i, *j, *limit;         /* scan and limit pointers        */
1706    size_t thresh;               /* size of T elements in bytes    */
1707    char *base;                  /* base pointer as char *         */
1708    base = (char *)basep;        /* set up char * base pointer     */
1709    thresh = T * size;           /* init threshold                 */
1710    sp = stack;                  /* init stack pointer             */
1711    limit = base + nelems * size;/* pointer past end of array      */
1712    for ( ;; ) {                 /* repeat until break...          */
1713       if ( limit - base > thresh ) {  /* if more than T elements  */
1714                                       /*   swap base with middle  */
1715          SWAP((((limit-base)/size)/2)*size+base, base);
1716          i = base + size;             /* i scans left to right    */
1717          j = limit - size;            /* j scans right to left    */
1718          if ( COMP(i, j) > 0 )        /* Sedgewick's              */
1719             SWAP(i, j);               /*    three-element sort    */
1720          if ( COMP(base, j) > 0 )     /*        sets things up    */
1721             SWAP(base, j);            /*            so that       */
1722          if ( COMP(i, base) > 0 )     /*      *i <= *base <= *j   */
1723             SWAP(i, base);            /* *base is pivot element   */
1724          for ( ;; ) {                 /* loop until break         */
1725             do                        /* move i right             */
1726                i += size;             /*        until *i >= pivot */
1727             while ( COMP(i, base) < 0 );
1728             do                        /* move j left              */
1729                j -= size;             /*        until *j <= pivot */
1730             while ( COMP(j, base) > 0 );
1731             if ( i > j )              /* if pointers crossed      */
1732                break;                 /*     break loop           */
1733             SWAP(i, j);       /* else swap elements, keep scanning*/
1734          }
1735          SWAP(base, j);         /* move pivot into correct place  */
1736          if ( j - base > limit - i ) {  /* if left subfile larger */
1737             sp[0] = base;             /* stack left subfile base  */
1738             sp[1] = j;                /*    and limit             */
1739             base = i;                 /* sort the right subfile   */
1740          } else {                     /* else right subfile larger*/
1741             sp[0] = i;                /* stack right subfile base */
1742             sp[1] = limit;            /*    and limit             */
1743             limit = j;                /* sort the left subfile    */
1744          }
1745          sp += 2;                     /* increment stack pointer  */
1746       } else {      /* else subfile is small, use insertion sort  */
1747          for ( j = base, i = j+size; i < limit; j = i, i += size )
1748             for ( ; COMP(j, j+size) > 0; j -= size ) {
1749                SWAP(j, j+size);
1750                if ( j == base )
1751                   break;
1752             }
1753          if ( sp != stack ) {         /* if any entries on stack  */
1754             sp -= 2;                  /* pop the base and limit   */
1755             base = sp[0];
1756             limit = sp[1];
1757          } else                       /* else stack empty, done   */
1758             break;
1759       }
1760    }
1761 }
1762 #endif // __sun__ qsort drop-in replacement
1763
1764 #define SORT_LIST_SIZE 100
1765
1766 typedef struct sort_item {
1767         int objnum;
1768         fix dist;
1769 } sort_item;
1770
1771 sort_item sort_list[SORT_LIST_SIZE];
1772 int n_sort_items;
1773
1774 //compare function for object sort.
1775 int sort_func(const sort_item *a,const sort_item *b)
1776 {
1777         fix delta_dist;
1778         object *obj_a,*obj_b;
1779
1780         delta_dist = a->dist - b->dist;
1781
1782         obj_a = &Objects[a->objnum];
1783         obj_b = &Objects[b->objnum];
1784
1785         if (abs(delta_dist) < (obj_a->size + obj_b->size)) {            //same position
1786
1787                 //these two objects are in the same position.  see if one is a fireball
1788                 //or laser or something that should plot on top.  Don't do this for
1789                 //the afterburner blobs, though.
1790
1791                 if (obj_a->type == OBJ_WEAPON || (obj_a->type == OBJ_FIREBALL && obj_a->id != VCLIP_AFTERBURNER_BLOB))
1792                         if (!(obj_b->type == OBJ_WEAPON || obj_b->type == OBJ_FIREBALL))
1793                                 return -1;      //a is weapon, b is not, so say a is closer
1794                         else;                           //both are weapons
1795                 else
1796                         if (obj_b->type == OBJ_WEAPON || (obj_b->type == OBJ_FIREBALL && obj_b->id != VCLIP_AFTERBURNER_BLOB))
1797                                 return 1;       //b is weapon, a is not, so say a is farther
1798
1799                 //no special case, fall through to normal return
1800         }
1801
1802         return delta_dist;      //return distance
1803 }
1804
1805 void build_object_lists(int n_segs)
1806 {
1807         int nn;
1808
1809 //mprintf((0,"build n_segs=%d",n_segs));
1810
1811         for (nn=0;nn<MAX_RENDER_SEGS+N_EXTRA_OBJ_LISTS;nn++)
1812                 render_obj_list[nn][0] = -1;
1813
1814         for (nn=0;nn<n_segs;nn++) {
1815                 int segnum;
1816
1817                 segnum = Render_list[nn];
1818
1819 //mprintf((0,"nn=%d seg=%d ",nn,segnum));
1820
1821                 if (segnum != -1) {
1822                         int objnum;
1823                         object *obj;
1824
1825                         for (objnum=Segments[segnum].objects;objnum!=-1;objnum = obj->next) {
1826                                 int new_segnum,did_migrate,list_pos;
1827
1828                                 obj = &Objects[objnum];
1829
1830                                 Assert( obj->segnum == segnum );
1831
1832                                 if (obj->flags & OF_ATTACHED)
1833                                         continue;               //ignore this object
1834
1835                                 new_segnum = segnum;
1836                                 list_pos = nn;
1837
1838 //mprintf((0,"objnum=%d ",objnum));
1839                                 if (obj->type != OBJ_CNTRLCEN && !(obj->type==OBJ_ROBOT && obj->id==65))                //don't migrate controlcen
1840                                 do {
1841                                         segmasks m;
1842
1843                                         did_migrate = 0;
1844
1845                                         m = get_seg_masks(&obj->pos,new_segnum,obj->size);
1846
1847                                         if (m.sidemask) {
1848                                                 int sn,sf;
1849
1850                                                 for (sn=0,sf=1;sn<6;sn++,sf<<=1)
1851                                                         if (m.sidemask & sf) {
1852                                                                 segment *seg = &Segments[new_segnum];
1853
1854                                                                 if (WALL_IS_DOORWAY(seg,sn) & WID_FLY_FLAG) {           //can explosion migrate through
1855                                                                         int child = seg->children[sn];
1856                                                                         int checknp;
1857
1858                                                                         for (checknp=list_pos;checknp--;)
1859                                                                                 if (Render_list[checknp] == child) {
1860 //mprintf((0,"mig from %d to %d ",new_segnum,child));
1861                                                                                         new_segnum = child;
1862                                                                                         list_pos = checknp;
1863                                                                                         did_migrate = 1;
1864                                                                                 }
1865                                                                 }
1866                                                         }
1867                                         }
1868
1869                                 } while (0);    //while (did_migrate);
1870
1871                                 add_obj_to_seglist(objnum,list_pos);
1872
1873                         }
1874
1875                 }
1876         }
1877
1878 //mprintf((0,"done build "));
1879
1880         //now that there's a list for each segment, sort the items in those lists
1881         for (nn=0;nn<n_segs;nn++) {
1882                 int segnum;
1883
1884                 segnum = Render_list[nn];
1885
1886 //mprintf((0,"nn=%d seg=%d ",nn,segnum));
1887
1888                 if (segnum != -1) {
1889                         int t,lookn,i,n;
1890
1891                         //first count the number of objects & copy into sort list
1892
1893                         lookn = nn;
1894                         i = n_sort_items = 0;
1895                         while ((t=render_obj_list[lookn][i++])!=-1)
1896                                 if (t<0)
1897                                         {lookn = -t; i=0;}
1898                                 else
1899                                         if (n_sort_items < SORT_LIST_SIZE-1) {          //add if room
1900                                                 sort_list[n_sort_items].objnum = t;
1901                                                 //NOTE: maybe use depth, not dist - quicker computation
1902                                                 sort_list[n_sort_items].dist = vm_vec_dist_quick(&Objects[t].pos,&Viewer_eye);
1903                                                 n_sort_items++;
1904                                         }
1905                                         else {                  //no room for object
1906                                                 int ii;
1907
1908                                                 #ifndef NDEBUG
1909                                                 FILE *tfile=fopen("sortlist.out","wt");
1910
1911                                                 //I find this strange, so I'm going to write out
1912                                                 //some information to look at later
1913                                                 if (tfile) {
1914                                                         for (ii=0;ii<SORT_LIST_SIZE;ii++) {
1915                                                                 int objnum = sort_list[ii].objnum;
1916
1917                                                                 fprintf(tfile,"Obj %3d  Type = %2d  Id = %2d  Dist = %08x  Segnum = %3d\n",
1918                                                                         objnum,Objects[objnum].type,Objects[objnum].id,sort_list[ii].dist,Objects[objnum].segnum);
1919                                                         }
1920                                                         fclose(tfile);
1921                                                 }
1922                                                 #endif
1923
1924                                                 Int3(); //Get Matt!!!
1925
1926                                                 //Now try to find a place for this object by getting rid
1927                                                 //of an object we don't care about
1928
1929                                                 for (ii=0;ii<SORT_LIST_SIZE;ii++) {
1930                                                         int objnum = sort_list[ii].objnum;
1931                                                         object *obj = &Objects[objnum];
1932                                                         int type = obj->type;
1933
1934                                                         //replace debris & fireballs
1935                                                         if (type == OBJ_DEBRIS || type == OBJ_FIREBALL) {
1936                                                                 fix dist = vm_vec_dist_quick(&Objects[t].pos,&Viewer_eye);
1937
1938                                                                 //don't replace same kind of object unless new
1939                                                                 //one is closer
1940
1941                                                                 if (Objects[t].type != type || dist < sort_list[ii].dist) {
1942                                                                         sort_list[ii].objnum = t;
1943                                                                         sort_list[ii].dist = dist;
1944                                                                         break;
1945                                                                 }
1946                                                         }
1947                                                 }
1948
1949                                                 Int3(); //still couldn't find a slot
1950                                         }
1951
1952
1953                         //now call qsort
1954                 #if defined(__WATCOMC__) || defined(MACINTOSH)
1955                         qsort(sort_list,n_sort_items,sizeof(*sort_list),
1956                                    sort_func);
1957                 #else
1958                         qsort(sort_list,n_sort_items,sizeof(*sort_list),
1959                                         (int (*)(const void*,const void*))sort_func);
1960                 #endif
1961
1962                         //now copy back into list
1963
1964                         lookn = nn;
1965                         i = 0;
1966                         n = n_sort_items;
1967                         while ((t=render_obj_list[lookn][i])!=-1 && n>0)
1968                                 if (t<0)
1969                                         {lookn = -t; i=0;}
1970                                 else
1971                                         render_obj_list[lookn][i++] = sort_list[--n].objnum;
1972                         render_obj_list[lookn][i] = -1; //mark (possibly new) end
1973                 }
1974         }
1975 }
1976
1977 int Use_player_head_angles = 0;
1978 vms_angvec Player_head_angles;
1979
1980 extern int Num_tmaps_drawn;
1981 extern int Total_pixels;
1982 //--unused-- int Total_num_tmaps_drawn=0;
1983
1984 int Rear_view=0;
1985 extern ubyte RenderingType;
1986
1987 void start_lighting_frame(object *viewer);
1988
1989 #ifdef JOHN_ZOOM
1990 fix Zoom_factor=F1_0;
1991 #endif
1992 //renders onto current canvas
1993 void render_frame(fix eye_offset, int window_num)
1994 {
1995         int start_seg_num;
1996
1997 #if defined(POLY_ACC)
1998 //$$ not needed for Verite, probably optional for ViRGE.    pa_flush();
1999 #endif
2000
2001 //Total_num_tmaps_drawn += Num_tmaps_drawn;
2002 //if ((FrameCount > 0) && (Total_num_tmaps_drawn))
2003 //      mprintf((0, "Frame: %4i, total = %6i, Avg = %7.3f, Avgpix=%7.3f\n", Num_tmaps_drawn, Total_num_tmaps_drawn, (float) Total_num_tmaps_drawn/FrameCount, (float) Total_pixels/Total_num_tmaps_drawn));
2004 //Num_tmaps_drawn = 0;
2005
2006         if (Endlevel_sequence) {
2007                 render_endlevel_frame(eye_offset);
2008                 FrameCount++;
2009                 return;
2010         }
2011
2012 #ifdef NEWDEMO
2013         if ( Newdemo_state == ND_STATE_RECORDING && eye_offset >= 0 )   {
2014
2015           //    mprintf ((0,"Objnum=%d objtype=%d objid=%d\n",Viewer-Objects,Viewer->type,Viewer->id));
2016
2017       if (RenderingType==0)
2018                 newdemo_record_start_frame(FrameCount, FrameTime );
2019       if (RenderingType!=255)
2020                 newdemo_record_viewer_object(Viewer);
2021         }
2022 #endif
2023
2024    //Here:
2025
2026         start_lighting_frame(Viewer);           //this is for ugly light-smoothing hack
2027
2028         g3_start_frame();
2029
2030         Viewer_eye = Viewer->pos;
2031
2032 //      if (Viewer->type == OBJ_PLAYER && (Cockpit_mode!=CM_REAR_VIEW))
2033 //              vm_vec_scale_add2(&Viewer_eye,&Viewer->orient.fvec,(Viewer->size*3)/4);
2034
2035         if (eye_offset) {
2036                 vm_vec_scale_add2(&Viewer_eye,&Viewer->orient.rvec,eye_offset);
2037         }
2038
2039         #ifdef EDITOR
2040         if (Function_mode==FMODE_EDITOR)
2041                 Viewer_eye = Viewer->pos;
2042         #endif
2043
2044         start_seg_num = find_point_seg(&Viewer_eye,Viewer->segnum);
2045
2046         if (start_seg_num==-1)
2047                 start_seg_num = Viewer->segnum;
2048
2049         if (Viewer==ConsoleObject && Use_player_head_angles) {
2050                 vms_matrix headm,viewm;
2051                 vm_angles_2_matrix(&headm,&Player_head_angles);
2052                 vm_matrix_x_matrix(&viewm,&Viewer->orient,&headm);
2053                 g3_set_view_matrix(&Viewer_eye,&viewm,Render_zoom);
2054         //@@} else if ((Cockpit_mode==CM_REAR_VIEW) && (Viewer==ConsoleObject)) {
2055         } else if (Rear_view && (Viewer==ConsoleObject)) {
2056                 vms_matrix headm,viewm;
2057                 Player_head_angles.p = Player_head_angles.b = 0;
2058                 Player_head_angles.h = 0x7fff;
2059                 vm_angles_2_matrix(&headm,&Player_head_angles);
2060                 vm_matrix_x_matrix(&viewm,&Viewer->orient,&headm);
2061                 g3_set_view_matrix(&Viewer_eye,&viewm,Render_zoom);
2062         } else  {
2063 #ifdef JOHN_ZOOM
2064                 if (keyd_pressed[KEY_RSHIFT] )  {
2065                         Zoom_factor += FrameTime*4;
2066                         if (Zoom_factor > F1_0*5 ) Zoom_factor=F1_0*5;
2067                 } else {
2068                         Zoom_factor -= FrameTime*4;
2069                         if (Zoom_factor < F1_0 ) Zoom_factor = F1_0;
2070                 }
2071                 g3_set_view_matrix(&Viewer_eye,&Viewer->orient,fixdiv(Render_zoom,Zoom_factor));
2072 #else
2073                 g3_set_view_matrix(&Viewer_eye,&Viewer->orient,Render_zoom);
2074 #endif
2075         }
2076
2077         if (Clear_window == 1) {
2078                 if (Clear_window_color == -1)
2079                         Clear_window_color = BM_XRGB(0, 0, 0);  //BM_XRGB(31, 15, 7);
2080                 gr_clear_canvas(Clear_window_color);
2081         }
2082         #ifndef NDEBUG
2083         if (Show_only_curside)
2084                 gr_clear_canvas(Clear_window_color);
2085         #endif
2086
2087         render_mine(start_seg_num, eye_offset, window_num);
2088
2089         if (Use_player_head_angles )
2090                 draw_3d_reticle(eye_offset);
2091
2092         g3_end_frame();
2093
2094    //RenderingType=0;
2095
2096         // -- Moved from here by MK, 05/17/95, wrong if multiple renders/frame! FrameCount++;           //we have rendered a frame
2097 }
2098
2099 int first_terminal_seg;
2100
2101 void update_rendered_data(int window_num, object *viewer, int rear_view_flag, int user)
2102 {
2103         Assert(window_num < MAX_RENDERED_WINDOWS);
2104         Window_rendered_data[window_num].frame = FrameCount;
2105         Window_rendered_data[window_num].viewer = viewer;
2106         Window_rendered_data[window_num].rear_view = rear_view_flag;
2107         Window_rendered_data[window_num].user = user;
2108 }
2109
2110 //build a list of segments to be rendered
2111 //fills in Render_list & N_render_segs
2112 void build_segment_list(int start_seg_num, int window_num)
2113 {
2114         int     lcnt,scnt,ecnt;
2115         int     l,c;
2116         int     ch;
2117
2118         memset(visited, 0, sizeof(visited[0])*(Highest_segment_index+1));
2119         memset(render_pos, -1, sizeof(render_pos[0])*(Highest_segment_index+1));
2120         //memset(no_render_flag, 0, sizeof(no_render_flag[0])*(MAX_RENDER_SEGS));
2121         memset(processed, 0, sizeof(processed));
2122
2123         #ifndef NDEBUG
2124         memset(visited2, 0, sizeof(visited2[0])*(Highest_segment_index+1));
2125         #endif
2126
2127         lcnt = scnt = 0;
2128
2129         Render_list[lcnt] = start_seg_num; visited[start_seg_num]=1;
2130         Seg_depth[lcnt] = 0;
2131         lcnt++;
2132         ecnt = lcnt;
2133         render_pos[start_seg_num] = 0;
2134
2135         #ifndef NDEBUG
2136         if (pre_draw_segs)
2137                 render_segment(start_seg_num, window_num);
2138         #endif
2139
2140         render_windows[0].left=render_windows[0].top=0;
2141         render_windows[0].right=grd_curcanv->cv_bitmap.bm_w-1;
2142         render_windows[0].bot=grd_curcanv->cv_bitmap.bm_h-1;
2143
2144         //breadth-first renderer
2145
2146         //build list
2147
2148         for (l=0;l<Render_depth;l++) {
2149
2150                 //while (scnt < ecnt) {
2151                 for (scnt=0;scnt < ecnt;scnt++) {
2152                         int rotated,segnum;
2153                         window *check_w;
2154                         short child_list[MAX_SIDES_PER_SEGMENT];                //list of ordered sides to process
2155                         int n_children;                                                                         //how many sides in child_list
2156                         segment *seg;
2157
2158                         if (processed[scnt])
2159                                 continue;
2160
2161                         processed[scnt]=1;
2162
2163                         segnum = Render_list[scnt];
2164                         check_w = &render_windows[scnt];
2165
2166                         #ifndef NDEBUG
2167                         if (draw_boxes)
2168                                 draw_window_box(RED,check_w->left,check_w->top,check_w->right,check_w->bot);
2169                         #endif
2170
2171                         if (segnum == -1) continue;
2172
2173                         seg = &Segments[segnum];
2174                         rotated=0;
2175
2176                         //look at all sides of this segment.
2177                         //tricky code to look at sides in correct order follows
2178
2179                         for (c=n_children=0;c<MAX_SIDES_PER_SEGMENT;c++) {              //build list of sides
2180                                 int wid;
2181
2182                                 wid = WALL_IS_DOORWAY(seg, c);
2183
2184                                 ch=seg->children[c];
2185
2186                                 if ( (window_check || !visited[ch]) && (wid & WID_RENDPAST_FLAG) ) {
2187                                         if (behind_check) {
2188                                                 sbyte *sv = Side_to_verts[c];
2189                                                 ubyte codes_and=0xff;
2190                                                 int i;
2191
2192                                                 rotate_list(8,seg->verts);
2193                                                 rotated=1;
2194
2195                                                 for (i=0;i<4;i++)
2196                                                         codes_and &= Segment_points[seg->verts[sv[i]]].p3_codes;
2197
2198                                                 if (codes_and & CC_BEHIND) continue;
2199
2200                                         }
2201                                         child_list[n_children++] = c;
2202                                 }
2203                         }
2204
2205                         //now order the sides in some magical way
2206
2207                         if (new_seg_sorting)
2208                                 sort_seg_children(seg,n_children,child_list);
2209
2210                         //for (c=0;c<MAX_SIDES_PER_SEGMENT;c++) {
2211                         //      ch=seg->children[c];
2212
2213                         for (c=0;c<n_children;c++) {
2214                                 int siden;
2215
2216                                 siden = child_list[c];
2217                                 ch=seg->children[siden];
2218                                 //if ( (window_check || !visited[ch])&& (WALL_IS_DOORWAY(seg, c))) {
2219                                 {
2220                                         if (window_check) {
2221                                                 int i;
2222                                                 ubyte codes_and_3d,codes_and_2d;
2223                                                 short _x,_y,min_x=32767,max_x=-32767,min_y=32767,max_y=-32767;
2224                                                 int no_proj_flag=0;     //a point wasn't projected
2225
2226                                                 if (rotated<2) {
2227                                                         if (!rotated)
2228                                                                 rotate_list(8,seg->verts);
2229                                                         project_list(8,seg->verts);
2230                                                         rotated=2;
2231                                                 }
2232
2233                                                 for (i=0,codes_and_3d=codes_and_2d=0xff;i<4;i++) {
2234                                                         int p = seg->verts[Side_to_verts[siden][i]];
2235                                                         g3s_point *pnt = &Segment_points[p];
2236
2237                                                         if (! (pnt->p3_flags&PF_PROJECTED)) {no_proj_flag=1; break;}
2238
2239                                                         _x = f2i(pnt->p3_sx);
2240                                                         _y = f2i(pnt->p3_sy);
2241
2242                                                         codes_and_3d &= pnt->p3_codes;
2243                                                         codes_and_2d &= code_window_point(_x,_y,check_w);
2244
2245                                                         #ifndef NDEBUG
2246                                                         if (draw_edges) {
2247                                                                 gr_setcolor(BM_XRGB(31,0,31));
2248                                                                 gr_line(pnt->p3_sx,pnt->p3_sy,
2249                                                                         Segment_points[seg->verts[Side_to_verts[siden][(i+1)%4]]].p3_sx,
2250                                                                         Segment_points[seg->verts[Side_to_verts[siden][(i+1)%4]]].p3_sy);
2251                                                         }
2252                                                         #endif
2253
2254                                                         if (_x < min_x) min_x = _x;
2255                                                         if (_x > max_x) max_x = _x;
2256
2257                                                         if (_y < min_y) min_y = _y;
2258                                                         if (_y > max_y) max_y = _y;
2259
2260                                                 }
2261
2262                                                 #ifndef NDEBUG
2263                                                 if (draw_boxes)
2264                                                         draw_window_box(WHITE,min_x,min_y,max_x,max_y);
2265                                                 #endif
2266
2267                                                 if (no_proj_flag || (!codes_and_3d && !codes_and_2d)) { //maybe add this segment
2268                                                         int rp = render_pos[ch];
2269                                                         window *new_w = &render_windows[lcnt];
2270
2271                                                         if (no_proj_flag) *new_w = *check_w;
2272                                                         else {
2273                                                                 new_w->left  = max(check_w->left,min_x);
2274                                                                 new_w->right = min(check_w->right,max_x);
2275                                                                 new_w->top   = max(check_w->top,min_y);
2276                                                                 new_w->bot   = min(check_w->bot,max_y);
2277                                                         }
2278
2279                                                         //see if this seg already visited, and if so, does current window
2280                                                         //expand the old window?
2281                                                         if (rp != -1) {
2282                                                                 if (new_w->left < render_windows[rp].left ||
2283                                                                                  new_w->top < render_windows[rp].top ||
2284                                                                                  new_w->right > render_windows[rp].right ||
2285                                                                                  new_w->bot > render_windows[rp].bot) {
2286
2287                                                                         new_w->left  = min(new_w->left,render_windows[rp].left);
2288                                                                         new_w->right = max(new_w->right,render_windows[rp].right);
2289                                                                         new_w->top   = min(new_w->top,render_windows[rp].top);
2290                                                                         new_w->bot   = max(new_w->bot,render_windows[rp].bot);
2291
2292                                                                         if (no_migrate_segs) {
2293                                                                                 //no_render_flag[lcnt] = 1;
2294                                                                                 Render_list[lcnt] = -1;
2295                                                                                 render_windows[rp] = *new_w;            //get updated window
2296                                                                                 processed[rp] = 0;              //force reprocess
2297                                                                                 goto no_add;
2298                                                                         }
2299                                                                         else
2300                                                                                 Render_list[rp]=-1;
2301                                                                 }
2302                                                                 else goto no_add;
2303                                                         }
2304
2305                                                         #ifndef NDEBUG
2306                                                         if (draw_boxes)
2307                                                                 draw_window_box(5,new_w->left,new_w->top,new_w->right,new_w->bot);
2308                                                         #endif
2309
2310                                                         render_pos[ch] = lcnt;
2311                                                         Render_list[lcnt] = ch;
2312                                                         Seg_depth[lcnt] = l;
2313                                                         lcnt++;
2314                                                         if (lcnt >= MAX_RENDER_SEGS) {mprintf((0,"Too many segs in render list!!\n")); goto done_list;}
2315                                                         visited[ch] = 1;
2316
2317                                                         #ifndef NDEBUG
2318                                                         if (pre_draw_segs)
2319                                                                 render_segment(ch, window_num);
2320                                                         #endif
2321 no_add:
2322         ;
2323
2324                                                 }
2325                                         }
2326                                         else {
2327                                                 Render_list[lcnt] = ch;
2328                                                 Seg_depth[lcnt] = l;
2329                                                 lcnt++;
2330                                                 if (lcnt >= MAX_RENDER_SEGS) {mprintf((0,"Too many segs in render list!!\n")); goto done_list;}
2331                                                 visited[ch] = 1;
2332                                         }
2333                                 }
2334                         }
2335                 }
2336
2337                 scnt = ecnt;
2338                 ecnt = lcnt;
2339
2340         }
2341 done_list:
2342
2343         lcnt_save = lcnt;
2344         scnt_save = scnt;
2345
2346         first_terminal_seg = scnt;
2347         N_render_segs = lcnt;
2348
2349 }
2350
2351 //renders onto current canvas
2352 void render_mine(int start_seg_num,fix eye_offset, int window_num)
2353 {
2354 #ifndef NDEBUG
2355         int             i;
2356 #endif
2357         int             nn;
2358
2359         //      Initialize number of objects (actually, robots!) rendered this frame.
2360         Window_rendered_data[window_num].num_objects = 0;
2361
2362 #ifdef LASER_HACK
2363         Hack_nlasers = 0;
2364 #endif
2365
2366         #ifndef NDEBUG
2367         for (i=0;i<=Highest_object_index;i++)
2368                 object_rendered[i] = 0;
2369         #endif
2370
2371         //set up for rendering
2372
2373         render_start_frame();
2374
2375
2376         #if defined(EDITOR) && !defined(NDEBUG)
2377         if (Show_only_curside) {
2378                 rotate_list(8,Cursegp->verts);
2379                 render_side(Cursegp,Curside);
2380                 goto done_rendering;
2381         }
2382         #endif
2383
2384
2385         #ifdef EDITOR
2386         if (_search_mode)       {
2387                 //lcnt = lcnt_save;
2388                 //scnt = scnt_save;
2389         }
2390         else
2391         #endif
2392                 //NOTE LINK TO ABOVE!!
2393                 build_segment_list(start_seg_num, window_num);          //fills in Render_list & N_render_segs
2394
2395         //render away
2396
2397         #ifndef NDEBUG
2398         if (!window_check) {
2399                 Window_clip_left  = Window_clip_top = 0;
2400                 Window_clip_right = grd_curcanv->cv_bitmap.bm_w-1;
2401                 Window_clip_bot   = grd_curcanv->cv_bitmap.bm_h-1;
2402         }
2403         #endif
2404
2405         #ifndef NDEBUG
2406         if (!(_search_mode)) {
2407                 int i;
2408
2409                 for (i=0;i<N_render_segs;i++) {
2410                         int segnum;
2411
2412                         segnum = Render_list[i];
2413
2414                         if (segnum != -1)
2415                         {
2416                                 if (visited2[segnum])
2417                                         Int3();         //get Matt
2418                                 else
2419                                         visited2[segnum] = 1;
2420                         }
2421                 }
2422         }
2423         #endif
2424
2425         if (!(_search_mode))
2426                 build_object_lists(N_render_segs);
2427
2428         if (eye_offset<=0)              // Do for left eye or zero.
2429                 set_dynamic_light();
2430
2431         if (!_search_mode && Clear_window == 2) {
2432                 if (first_terminal_seg < N_render_segs) {
2433                         int i;
2434
2435                         if (Clear_window_color == -1)
2436                                 Clear_window_color = BM_XRGB(0, 0, 0);  //BM_XRGB(31, 15, 7);
2437
2438                         gr_setcolor(Clear_window_color);
2439
2440                         for (i=first_terminal_seg; i<N_render_segs; i++) {
2441                                 if (Render_list[i] != -1) {
2442                                         #ifndef NDEBUG
2443                                         if ((render_windows[i].left == -1) || (render_windows[i].top == -1) || (render_windows[i].right == -1) || (render_windows[i].bot == -1))
2444                                                 Int3();
2445                                         else
2446                                         #endif
2447                                                 //NOTE LINK TO ABOVE!
2448                                                 gr_rect(render_windows[i].left, render_windows[i].top, render_windows[i].right, render_windows[i].bot);
2449                                 }
2450                         }
2451                 }
2452         }
2453
2454         for (nn=N_render_segs;nn--;) {
2455                 int segnum;
2456                 int objnp;
2457
2458                 // Interpolation_method = 0;
2459                 segnum = Render_list[nn];
2460                 Current_seg_depth = Seg_depth[nn];
2461
2462                 //if (!no_render_flag[nn])
2463                 if (segnum!=-1 && (_search_mode || visited[segnum]!=255)) {
2464                         //set global render window vars
2465
2466                         if (window_check) {
2467                                 Window_clip_left  = render_windows[nn].left;
2468                                 Window_clip_top   = render_windows[nn].top;
2469                                 Window_clip_right = render_windows[nn].right;
2470                                 Window_clip_bot   = render_windows[nn].bot;
2471                         }
2472
2473                         //mprintf((0," %d",segnum));
2474
2475                         render_segment(segnum, window_num);
2476                         visited[segnum]=255;
2477
2478                         if (window_check) {             //reset for objects
2479                                 Window_clip_left  = Window_clip_top = 0;
2480                                 Window_clip_right = grd_curcanv->cv_bitmap.bm_w-1;
2481                                 Window_clip_bot   = grd_curcanv->cv_bitmap.bm_h-1;
2482                         }
2483
2484                         if (migrate_objects) {
2485                                 //int n_expl_objs=0,expl_objs[5],i;
2486                                 int listnum;
2487                                 int save_linear_depth = Max_linear_depth;
2488
2489                                 Max_linear_depth = Max_linear_depth_objects;
2490
2491                                 listnum = nn;
2492
2493                                 //mprintf((0,"render objs seg %d",segnum));
2494
2495                                 for (objnp=0;render_obj_list[listnum][objnp]!=-1;)      {
2496                                         int ObjNumber = render_obj_list[listnum][objnp];
2497
2498                                         if (ObjNumber >= 0) {
2499
2500                                                 //mprintf( (0, "Type: %d\n", Objects[ObjNumber].type ));
2501
2502                                                 //if (Objects[ObjNumber].type == OBJ_FIREBALL && n_expl_objs<5) {
2503                                                 //      expl_objs[n_expl_objs++] = ObjNumber;
2504                                                 //} else
2505                                                 #ifdef LASER_HACK
2506                                                 if (    (Objects[ObjNumber].type==OBJ_WEAPON) &&                                                                //if its a weapon
2507                                                                 (Objects[ObjNumber].lifeleft==Laser_max_time ) &&       //  and its in it's first frame
2508                                                                 (Hack_nlasers< MAX_HACKED_LASERS) &&                                                                    //  and we have space for it
2509                                                                 (Objects[ObjNumber].laser_info.parent_num>-1) &&                                        //  and it has a parent
2510                                                                 ((Viewer-Objects)==Objects[ObjNumber].laser_info.parent_num)    //  and it's parent is the viewer
2511                                                    )            {
2512                                                         Hack_laser_list[Hack_nlasers++] = ObjNumber;                                                            //then make it draw after everything else.
2513                                                         //mprintf( (0, "O%d ", ObjNumber ));
2514                                                 } else
2515                                                 #endif
2516                                                         do_render_object(ObjNumber, window_num);        // note link to above else
2517
2518                                                 objnp++;
2519                                         }
2520                                         else {
2521
2522                                                 listnum = -ObjNumber;
2523                                                 objnp = 0;
2524
2525                                         }
2526
2527                                 }
2528
2529                                 //for (i=0;i<n_expl_objs;i++)
2530                                 //      do_render_object(expl_objs[i], window_num);
2531
2532                                 //mprintf((0,"done seg %d\n",segnum));
2533
2534                                 Max_linear_depth = save_linear_depth;
2535
2536                         }
2537
2538                 }
2539         }
2540
2541         //mprintf((0,"\n"));
2542
2543
2544 #ifdef LASER_HACK
2545         // Draw the hacked lasers last
2546         for (i=0; i < Hack_nlasers; i++ )       {
2547                 //mprintf( (0, "D%d ", Hack_laser_list[i] ));
2548                 do_render_object(Hack_laser_list[i], window_num);
2549         }
2550 #endif
2551
2552         // -- commented out by mk on 09/14/94...did i do a good thing??  object_render_targets();
2553
2554 #ifdef EDITOR
2555         #ifndef NDEBUG
2556         //draw curedge stuff
2557         if (Outline_mode) outline_seg_side(Cursegp,Curside,Curedge,Curvert);
2558         #endif
2559
2560 done_rendering:
2561         ;
2562
2563 #endif
2564
2565 }
2566 #ifdef EDITOR
2567
2568 extern int render_3d_in_big_window;
2569
2570 //finds what segment is at a given x&y -  seg,side,face are filled in
2571 //works on last frame rendered. returns true if found
2572 //if seg<0, then an object was found, and the object number is -seg-1
2573 int find_seg_side_face(short x,short y,int *seg,int *side,int *face,int *poly)
2574 {
2575         _search_mode = -1;
2576
2577         _search_x = x; _search_y = y;
2578
2579         found_seg = -1;
2580
2581         if (render_3d_in_big_window) {
2582                 grs_canvas temp_canvas;
2583
2584                 gr_init_sub_canvas(&temp_canvas,canv_offscreen,0,0,
2585                         LargeView.ev_canv->cv_bitmap.bm_w,LargeView.ev_canv->cv_bitmap.bm_h);
2586
2587                 gr_set_current_canvas(&temp_canvas);
2588
2589                 render_frame(0, 0);
2590         }
2591         else {
2592                 gr_set_current_canvas(&VR_render_sub_buffer[0]);        //render off-screen
2593                 render_frame(0, 0);
2594         }
2595
2596         _search_mode = 0;
2597
2598         *seg = found_seg;
2599         *side = found_side;
2600         *face = found_face;
2601         *poly = found_poly;
2602
2603 //      mprintf((0,"found seg=%d, side=%d, face=%d, poly=%d\n",found_seg,found_side,found_face,found_poly));
2604
2605         return (found_seg!=-1);
2606
2607 }
2608
2609 #endif