main/render.c

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