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 1.1.1.1 2001-01-19 03:30:01 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                                 Error("Illegal side type in render_side, type = %i, segment # = %i, side # = %i\n", sidep->type, segp-Segments, sidenum);
 630                 }
 631         }
 632
 633 }
 634
 635 #ifdef EDITOR
 636 void render_object_search(object *obj)
 637 {
 638         int changed=0;
 639
 640         //note that we draw each pixel object twice, since we cannot control
 641         //what color the object draws in, so we try color 0, then color 1,
 642         //in case the object itself is rendering color 0
 643
 644         gr_setcolor(0);
 645         gr_pixel(_search_x,_search_y);  //set our search pixel to color zero
 646         render_object(obj);
 647         if (gr_ugpixel(&grd_curcanv->cv_bitmap,_search_x,_search_y) != 0)
 648                 changed=1;
 649
 650         gr_setcolor(1);
 651         gr_pixel(_search_x,_search_y);  //set our search pixel to color zero
 652         render_object(obj);
 653         if (gr_ugpixel(&grd_curcanv->cv_bitmap,_search_x,_search_y) != 1)
 654                 changed=1;
 655
 656         if (changed) {
 657                 if (obj->segnum != -1)
 658                         Cursegp = &Segments[obj->segnum];
 659                 found_seg = -(obj-Objects+1);
 660         }
 661 }
 662 #endif
 663
 664 extern ubyte DemoDoingRight,DemoDoingLeft;
 665
 666 void do_render_object(int objnum, int window_num)
 667 {
 668         #ifdef EDITOR
 669         int save_3d_outline;
 670         #endif
 671         object *obj = &Objects[objnum];
 672         int count = 0;
 673         int n;
 674
 675         Assert(objnum < MAX_OBJECTS);
 676
 677         #ifndef NDEBUG
 678         if (object_rendered[objnum]) {          //already rendered this...
 679                 Int3();         //get Matt!!!
 680                 return;
 681         }
 682
 683         object_rendered[objnum] = 1;
 684         #endif
 685
 686    if (Newdemo_state==ND_STATE_PLAYBACK)
 687          {
 688           if ((DemoDoingLeft==6 || DemoDoingRight==6) && Objects[objnum].type==OBJ_PLAYER)
 689                 {
 690                         // A nice fat hack: keeps the player ship from showing up in the
 691                         // small extra view when guiding a missile in the big window
 692
 693                         mprintf ((0,"Returning from render_object prematurely...\n"));
 694                         return;
 695                 }
 696          }
 697
 698         //      Added by MK on 09/07/94 (at about 5:28 pm, CDT, on a beautiful, sunny late summer day!) so
 699         //      that the guided missile system will know what objects to look at.
 700         //      I didn't know we had guided missiles before the release of D1. --MK
 701         if ((Objects[objnum].type == OBJ_ROBOT) || (Objects[objnum].type == OBJ_PLAYER)) {
 702                 //Assert(Window_rendered_data[window_num].rendered_objects < MAX_RENDERED_OBJECTS);
 703                 //      This peculiar piece of code makes us keep track of the most recently rendered objects, which
 704                 //      are probably the higher priority objects, without overflowing the buffer
 705                 if (Window_rendered_data[window_num].num_objects >= MAX_RENDERED_OBJECTS) {
 706                         Int3();
 707                         Window_rendered_data[window_num].num_objects /= 2;
 708                 }
 709                 Window_rendered_data[window_num].rendered_objects[Window_rendered_data[window_num].num_objects++] = objnum;
 710         }
 711
 712         if ((count++ > MAX_OBJECTS) || (obj->next == objnum)) {
 713                 Int3();                                 // infinite loop detected
 714                 obj->next = -1;         // won't this clean things up?
 715                 return;                                 // get out of this infinite loop!
 716         }
 717
 718                 //g3_draw_object(obj->class_id,&obj->pos,&obj->orient,obj->size);
 719
 720         //check for editor object
 721
 722         #ifdef EDITOR
 723         if (Function_mode==FMODE_EDITOR && objnum==Cur_object_index) {
 724                 save_3d_outline = g3d_interp_outline;
 725                 g3d_interp_outline=1;
 726         }
 727         #endif
 728
 729         #ifdef EDITOR
 730         if (_search_mode)
 731                 render_object_search(obj);
 732         else
 733         #endif
 734                 //NOTE LINK TO ABOVE
 735                 render_object(obj);
 736
 737         for (n=obj->attached_obj;n!=-1;n=Objects[n].ctype.expl_info.next_attach) {
 738
 739                 Assert(Objects[n].type == OBJ_FIREBALL);
 740                 Assert(Objects[n].control_type == CT_EXPLOSION);
 741                 Assert(Objects[n].flags & OF_ATTACHED);
 742
 743                 render_object(&Objects[n]);
 744         }
 745
 746
 747         #ifdef EDITOR
 748         if (Function_mode==FMODE_EDITOR && objnum==Cur_object_index)
 749                 g3d_interp_outline = save_3d_outline;
 750         #endif
 751
 752
 753         //DEBUG mprintf( (0, "%d ", objnum ));
 754
 755 }
 756
 757 #ifndef NDEBUG
 758 int     draw_boxes=0;
 759 int window_check=1,draw_edges=0,new_seg_sorting=1,pre_draw_segs=0;
 760 int no_migrate_segs=1,migrate_objects=1,behind_check=1;
 761 int check_window_check=0;
 762 #else
 763 #define draw_boxes                      0
 764 #define window_check                    1
 765 #define draw_edges                      0
 766 #define new_seg_sorting         1
 767 #define pre_draw_segs           0
 768 #define no_migrate_segs         1
 769 #define migrate_objects         1
 770 #define behind_check                    1
 771 #define check_window_check      0
 772 #endif
 773
 774 //increment counter for checking if points rotated
 775 //This must be called at the start of the frame if rotate_list() will be used
 776 void render_start_frame()
 777 {
 778         RL_framecount++;
 779
 780         if (RL_framecount==0) {         //wrap!
 781
 782                 memset(Rotated_last,0,sizeof(Rotated_last));            //clear all to zero
 783                 RL_framecount=1;                                                                                        //and set this frame to 1
 784         }
 785 }
 786
 787 //Given a lit of point numbers, rotate any that haven't been rotated this frame
 788 g3s_codes rotate_list(int nv,short *pointnumlist)
 789 {
 790         int i,pnum;
 791         g3s_point *pnt;
 792         g3s_codes cc;
 793
 794         cc.and = 0xff;  cc.or = 0;
 795
 796         for (i=0;i<nv;i++) {
 797
 798                 pnum = pointnumlist[i];
 799
 800                 pnt = &Segment_points[pnum];
 801
 802                 if (Rotated_last[pnum] != RL_framecount) {
 803
 804                         g3_rotate_point(pnt,&Vertices[pnum]);
 805
 806                         Rotated_last[pnum] = RL_framecount;
 807                 }
 808
 809                 cc.and &= pnt->p3_codes;
 810                 cc.or  |= pnt->p3_codes;
 811         }
 812
 813         return cc;
 814
 815 }
 816
 817 //Given a lit of point numbers, project any that haven't been projected
 818 void project_list(int nv,short *pointnumlist)
 819 {
 820         int i,pnum;
 821
 822         for (i=0;i<nv;i++) {
 823
 824                 pnum = pointnumlist[i];
 825
 826                 if (!(Segment_points[pnum].p3_flags & PF_PROJECTED))
 827
 828                         g3_project_point(&Segment_points[pnum]);
 829
 830         }
 831 }
 832
 833
 834 // -----------------------------------------------------------------------------------
 835 void render_segment(int segnum, int window_num)
 836 {
 837         segment         *seg = &Segments[segnum];
 838         g3s_codes       cc;
 839         int                     sn;
 840
 841         Assert(segnum!=-1 && segnum<=Highest_segment_index);
 842
 843         cc=rotate_list(8,seg->verts);
 844
 845         if (! cc.and) {         //all off screen?
 846
 847 //mprintf( (0, "!"));
 848                 //DEBUG mprintf( (0, "[Segment %d: ", segnum ));
 849
 850                 // set_segment_local_light_value(segnum,INITIAL_LOCAL_LIGHT);
 851
 852       if (Viewer->type!=OBJ_ROBOT)
 853                 Automap_visited[segnum]=1;
 854
 855                 for (sn=0; sn<MAX_SIDES_PER_SEGMENT; sn++)
 856                         render_side(seg, sn);
 857         }
 858
 859         //draw any objects that happen to be in this segment
 860
 861         //sort objects!
 862         //object_sort_segment_objects( seg );
 863
 864         #ifndef NDEBUG
 865         if (!migrate_objects) {
 866                 int objnum;
 867                 for (objnum=seg->objects;objnum!=-1;objnum=Objects[objnum].next)
 868                         do_render_object(objnum, window_num);
 869         }
 870         #endif
 871
 872         //DEBUG mprintf( (0, "]\n", segnum ));
 873
 874 }
 875
 876 // ----- This used to be called when Show_only_curside was set.
 877 // ----- It is wholly and superiorly replaced by render_side.
 878 // -- //render one side of one segment
 879 // -- void render_seg_side(segment *seg,int _side)
 880 // -- {
 881 // --   g3s_codes cc;
 882 // --   short vertnum_list[4];
 883 // --
 884 // --   cc=g3_rotate_list(8,&seg->verts);
 885 // --
 886 // --   if (! cc.and) {         //all off screen?
 887 // --           int fn,pn,i;
 888 // --           side *s;
 889 // --           face *f;
 890 // --           poly *p;
 891 // --
 892 // --           s=&seg->sides[_side];
 893 // --
 894 // --           for (f=s->faces,fn=s->num_faces;fn;fn--,f++)
 895 // --                   for (p=f->polys,pn=f->num_polys;pn;pn--,p++) {
 896 // --                           grs_bitmap *tmap;
 897 // --
 898 // --                           for (i=0;i<p->num_vertices;i++) vertnum_list[i] = seg->verts[p->verts[i]];
 899 // --
 900 // --                           if (p->tmap_num >= NumTextures) {
 901 // --                                   Warning("Invalid tmap number %d, NumTextures=%d\n...Changing in poly structure to tmap 0",p->tmap_num,NumTextures);
 902 // --                                   p->tmap_num = 0;                //change it permanantly
 903 // --                           }
 904 // --
 905 // --                           tmap = Textures[p->tmap_num];
 906 // --
 907 // --                           g3_check_and_draw_tmap(p->num_vertices,vertnum_list,(g3s_uvl *) &p->uvls,tmap,&f->normal);
 908 // --
 909 // --                           if (Outline_mode) draw_outline(p->num_vertices,vertnum_list);
 910 // --                   }
 911 // --           }
 912 // --
 913 // -- }
 914
 915 #define CROSS_WIDTH  i2f(8)
 916 #define CROSS_HEIGHT i2f(8)
 917
 918 #ifndef NDEBUG
 919
 920 //draw outline for curside
 921 void outline_seg_side(segment *seg,int _side,int edge,int vert)
 922 {
 923         g3s_codes cc;
 924
 925         cc=rotate_list(8,seg->verts);
 926
 927         if (! cc.and) {         //all off screen?
 928                 side *s;
 929                 g3s_point *pnt;
 930
 931                 s=&seg->sides[_side];
 932
 933                 //render curedge of curside of curseg in green
 934
 935                 gr_setcolor(BM_XRGB(0,63,0));
 936                 g3_draw_line(&Segment_points[seg->verts[Side_to_verts[_side][edge]]],&Segment_points[seg->verts[Side_to_verts[_side][(edge+1)%4]]]);
 937
 938                 //draw a little cross at the current vert
 939
 940                 pnt = &Segment_points[seg->verts[Side_to_verts[_side][vert]]];
 941
 942                 g3_project_point(pnt);          //make sure projected
 943
 944 //              gr_setcolor(BM_XRGB(0,0,63));
 945 //              gr_line(pnt->p3_sx-CROSS_WIDTH,pnt->p3_sy,pnt->p3_sx+CROSS_WIDTH,pnt->p3_sy);
 946 //              gr_line(pnt->p3_sx,pnt->p3_sy-CROSS_HEIGHT,pnt->p3_sx,pnt->p3_sy+CROSS_HEIGHT);
 947
 948                 gr_line(pnt->p3_sx-CROSS_WIDTH,pnt->p3_sy,pnt->p3_sx,pnt->p3_sy-CROSS_HEIGHT);
 949                 gr_line(pnt->p3_sx,pnt->p3_sy-CROSS_HEIGHT,pnt->p3_sx+CROSS_WIDTH,pnt->p3_sy);
 950                 gr_line(pnt->p3_sx+CROSS_WIDTH,pnt->p3_sy,pnt->p3_sx,pnt->p3_sy+CROSS_HEIGHT);
 951                 gr_line(pnt->p3_sx,pnt->p3_sy+CROSS_HEIGHT,pnt->p3_sx-CROSS_WIDTH,pnt->p3_sy);
 952         }
 953 }
 954
 955 #endif
 956
 957 #if 0           //this stuff could probably just be deleted
 958
 959 #define DEFAULT_PERSPECTIVE_DEPTH 6
 960
 961 int Perspective_depth=DEFAULT_PERSPECTIVE_DEPTH;        //how many levels deep to render in perspective
 962
 963 int inc_perspective_depth(void)
 964 {
 965         return ++Perspective_depth;
 966
 967 }
 968
 969 int dec_perspective_depth(void)
 970 {
 971         return Perspective_depth==1?Perspective_depth:--Perspective_depth;
 972
 973 }
 974
 975 int reset_perspective_depth(void)
 976 {
 977         return Perspective_depth = DEFAULT_PERSPECTIVE_DEPTH;
 978
 979 }
 980 #endif
 981
 982 typedef struct window {
 983         short left,top,right,bot;
 984 } window;
 985
 986 ubyte code_window_point(fix x,fix y,window *w)
 987 {
 988         ubyte code=0;
 989
 990         if (x <= w->left)  code |= 1;
 991         if (x >= w->right) code |= 2;
 992
 993         if (y <= w->top) code |= 4;
 994         if (y >= w->bot) code |= 8;
 995
 996         return code;
 997 }
 998
 999 #ifndef NDEBUG
1000 void draw_window_box(int color,short left,short top,short right,short bot)
1001 {
1002         short l,t,r,b;
1003
1004         gr_setcolor(color);
1005
1006         l=left; t=top; r=right; b=bot;
1007
1008         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))
1009                 return;
1010
1011         if (l<0) l=0;
1012         if (t<0) t=0;
1013         if (r>=grd_curcanv->cv_bitmap.bm_w) r=grd_curcanv->cv_bitmap.bm_w-1;
1014         if (b>=grd_curcanv->cv_bitmap.bm_h) b=grd_curcanv->cv_bitmap.bm_h-1;
1015
1016         gr_line(i2f(l),i2f(t),i2f(r),i2f(t));
1017         gr_line(i2f(r),i2f(t),i2f(r),i2f(b));
1018         gr_line(i2f(r),i2f(b),i2f(l),i2f(b));
1019         gr_line(i2f(l),i2f(b),i2f(l),i2f(t));
1020
1021 }
1022 #endif
1023
1024 int matt_find_connect_side(int seg0,int seg1);
1025
1026 #ifndef NDEBUG
1027 char visited2[MAX_SEGMENTS];
1028 #endif
1029
1030 char visited[MAX_SEGMENTS];
1031 short Render_list[MAX_RENDER_SEGS];
1032 short Seg_depth[MAX_RENDER_SEGS];               //depth for each seg in Render_list
1033 ubyte processed[MAX_RENDER_SEGS];               //whether each entry has been processed
1034 int     lcnt_save,scnt_save;
1035 //@@short *persp_ptr;
1036 short render_pos[MAX_SEGMENTS]; //where in render_list does this segment appear?
1037 //ubyte no_render_flag[MAX_RENDER_SEGS];
1038 window render_windows[MAX_RENDER_SEGS];
1039
1040 short render_obj_list[MAX_RENDER_SEGS+N_EXTRA_OBJ_LISTS][OBJS_PER_SEG];
1041
1042 //for objects
1043
1044
1045
1046 #define RED   BM_XRGB(63,0,0)
1047 #define WHITE BM_XRGB(63,63,63)
1048
1049 //Given two sides of segment, tell the two verts which form the
1050 //edge between them
1051 short Two_sides_to_edge[6][6][2] = {
1052         { {-1,-1}, {3,7}, {-1,-1}, {2,6}, {6,7}, {2,3} },
1053         { {3,7}, {-1,-1}, {0,4}, {-1,-1}, {4,7}, {0,3} },
1054         { {-1,-1}, {0,4}, {-1,-1}, {1,5}, {4,5}, {0,1} },
1055         { {2,6}, {-1,-1}, {1,5}, {-1,-1}, {5,6}, {1,2} },
1056         { {6,7}, {4,7}, {4,5}, {5,6}, {-1,-1}, {-1,-1} },
1057         { {2,3}, {0,3}, {0,1}, {1,2}, {-1,-1}, {-1,-1} }
1058 };
1059
1060 //given an edge specified by two verts, give the two sides on that edge
1061 int Edge_to_sides[8][8][2] = {
1062         { {-1,-1}, {2,5}, {-1,-1}, {1,5}, {1,2}, {-1,-1}, {-1,-1}, {-1,-1} },
1063         { {2,5}, {-1,-1}, {3,5}, {-1,-1}, {-1,-1}, {2,3}, {-1,-1}, {-1,-1} },
1064         { {-1,-1}, {3,5}, {-1,-1}, {0,5}, {-1,-1}, {-1,-1}, {0,3}, {-1,-1} },
1065         { {1,5}, {-1,-1}, {0,5}, {-1,-1}, {-1,-1}, {-1,-1}, {-1,-1}, {0,1} },
1066         { {1,2}, {-1,-1}, {-1,-1}, {-1,-1}, {-1,-1}, {2,4}, {-1,-1}, {1,4} },
1067         { {-1,-1}, {2,3}, {-1,-1}, {-1,-1}, {2,4}, {-1,-1}, {3,4}, {-1,-1} },
1068         { {-1,-1}, {-1,-1}, {0,3}, {-1,-1}, {-1,-1}, {3,4}, {-1,-1}, {0,4} },
1069         { {-1,-1}, {-1,-1}, {-1,-1}, {0,1}, {1,4}, {-1,-1}, {0,4}, {-1,-1} },
1070 };
1071
1072 //@@//perform simple check on tables
1073 //@@check_check()
1074 //@@{
1075 //@@    int i,j;
1076 //@@
1077 //@@    for (i=0;i<8;i++)
1078 //@@            for (j=0;j<8;j++)
1079 //@@                    Assert(Edge_to_sides[i][j][0] == Edge_to_sides[j][i][0] &&
1080 //@@                                    Edge_to_sides[i][j][1] == Edge_to_sides[j][i][1]);
1081 //@@
1082 //@@    for (i=0;i<6;i++)
1083 //@@            for (j=0;j<6;j++)
1084 //@@                    Assert(Two_sides_to_edge[i][j][0] == Two_sides_to_edge[j][i][0] &&
1085 //@@                                    Two_sides_to_edge[i][j][1] == Two_sides_to_edge[j][i][1]);
1086 //@@
1087 //@@
1088 //@@}
1089
1090
1091 //given an edge, tell what side is on that edge
1092 int find_seg_side(segment *seg,short *verts,int notside)
1093 {
1094         int i;
1095         int vv0=-1,vv1=-1;
1096         int side0,side1;
1097         int *eptr;
1098         int     v0,v1;
1099         short   *vp;
1100
1101 //@@    check_check();
1102
1103         v0 = verts[0];
1104         v1 = verts[1];
1105         vp = seg->verts;
1106
1107         for (i=0; i<8; i++) {
1108                 int svv = *vp++;        // seg->verts[i];
1109
1110                 if (vv0==-1 && svv == v0) {
1111                         vv0 = i;
1112                         if (vv1 != -1)
1113                                 break;
1114                 }
1115
1116                 if (vv1==-1 && svv == v1) {
1117                         vv1 = i;
1118                         if (vv0 != -1)
1119                                 break;
1120                 }
1121         }
1122
1123         Assert(vv0!=-1 && vv1!=-1);
1124
1125         eptr = Edge_to_sides[vv0][vv1];
1126
1127         side0 = eptr[0];
1128         side1 = eptr[1];
1129
1130         Assert(side0!=-1 && side1!=-1);
1131
1132         if (side0 != notside) {
1133                 Assert(side1==notside);
1134                 return side0;
1135         }
1136         else {
1137                 Assert(side0==notside);
1138                 return side1;
1139         }
1140
1141 }
1142
1143 //find the two segments that join a given seg though two sides, and
1144 //the sides of those segments the abut.
1145 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)
1146 {
1147         segment *seg0,*seg1;
1148         short edge_verts[2];
1149         int notside0,notside1;
1150         int edgeside0,edgeside1;
1151
1152         Assert(s0!=-1 && s1!=-1);
1153
1154         seg0 = &Segments[seg->children[s0]];
1155         seg1 = &Segments[seg->children[s1]];
1156
1157         edge_verts[0] = seg->verts[Two_sides_to_edge[s0][s1][0]];
1158         edge_verts[1] = seg->verts[Two_sides_to_edge[s0][s1][1]];
1159
1160         Assert(edge_verts[0]!=-1 && edge_verts[1]!=-1);
1161
1162         notside0 = find_connect_side(seg,seg0);
1163         Assert(notside0 != -1);
1164         notside1 = find_connect_side(seg,seg1);
1165         Assert(notside1 != -1);
1166
1167         edgeside0 = find_seg_side(seg0,edge_verts,notside0);
1168         edgeside1 = find_seg_side(seg1,edge_verts,notside1);
1169
1170         //deal with the case where an edge is shared by more than two segments
1171
1172 //@@    if (IS_CHILD(seg0->children[edgeside0])) {
1173 //@@            segment *seg00;
1174 //@@            int notside00;
1175 //@@
1176 //@@            seg00 = &Segments[seg0->children[edgeside0]];
1177 //@@
1178 //@@            if (seg00 != seg1) {
1179 //@@
1180 //@@                    notside00 = find_connect_side(seg0,seg00);
1181 //@@                    Assert(notside00 != -1);
1182 //@@
1183 //@@                    edgeside0 = find_seg_side(seg00,edge_verts,notside00);
1184 //@@                    seg0 = seg00;
1185 //@@            }
1186 //@@
1187 //@@    }
1188 //@@
1189 //@@    if (IS_CHILD(seg1->children[edgeside1])) {
1190 //@@            segment *seg11;
1191 //@@            int notside11;
1192 //@@
1193 //@@            seg11 = &Segments[seg1->children[edgeside1]];
1194 //@@
1195 //@@            if (seg11 != seg0) {
1196 //@@                    notside11 = find_connect_side(seg1,seg11);
1197 //@@                    Assert(notside11 != -1);
1198 //@@
1199 //@@                    edgeside1 = find_seg_side(seg11,edge_verts,notside11);
1200 //@@                    seg1 = seg11;
1201 //@@            }
1202 //@@    }
1203
1204 //      if ( IS_CHILD(seg0->children[edgeside0]) ||
1205 //                IS_CHILD(seg1->children[edgeside1]))
1206 //              return 0;
1207
1208         #ifdef COMPACT_SEGS
1209                 get_side_normals(seg0, edgeside0, norm0_0, norm0_1 );
1210                 get_side_normals(seg1, edgeside1, norm1_0, norm1_1 );
1211         #else
1212                 *norm0_0 = seg0->sides[edgeside0].normals[0];
1213                 *norm0_1 = seg0->sides[edgeside0].normals[1];
1214                 *norm1_0 = seg1->sides[edgeside1].normals[0];
1215                 *norm1_1 = seg1->sides[edgeside1].normals[1];
1216         #endif
1217
1218         *pnt0 = &Vertices[seg0->verts[Side_to_verts[edgeside0][seg0->sides[edgeside0].type==3?1:0]]];
1219         *pnt1 = &Vertices[seg1->verts[Side_to_verts[edgeside1][seg1->sides[edgeside1].type==3?1:0]]];
1220
1221         return 1;
1222 }
1223
1224 //see if the order matters for these two children.
1225 //returns 0 if order doesn't matter, 1 if c0 before c1, -1 if c1 before c0
1226 int compare_children(segment *seg,short c0,short c1)
1227 {
1228         vms_vector norm0_0,norm0_1,*pnt0,temp;
1229         vms_vector norm1_0,norm1_1,*pnt1;
1230         fix d0_0,d0_1,d1_0,d1_1,d0,d1;
1231 int t;
1232
1233         if (Side_opposite[c0] == c1) return 0;
1234
1235         Assert(c0!=-1 && c1!=-1);
1236
1237         //find normals of adjoining sides
1238
1239         t = find_joining_side_norms(&norm0_0,&norm0_1,&norm1_0,&norm1_1,&pnt0,&pnt1,seg,c0,c1);
1240
1241 //if (!t)
1242 // return 0;
1243
1244         vm_vec_sub(&temp,&Viewer_eye,pnt0);
1245         d0_0 = vm_vec_dot(&norm0_0,&temp);
1246         d0_1 = vm_vec_dot(&norm0_1,&temp);
1247
1248         vm_vec_sub(&temp,&Viewer_eye,pnt1);
1249         d1_0 = vm_vec_dot(&norm1_0,&temp);
1250         d1_1 = vm_vec_dot(&norm1_1,&temp);
1251
1252         d0 = (d0_0 < 0 || d0_1 < 0)?-1:1;
1253         d1 = (d1_0 < 0 || d1_1 < 0)?-1:1;
1254
1255         if (d0 < 0 && d1 < 0)
1256                 return 0;
1257
1258         if (d0 < 0)
1259                 return 1;
1260         else if (d1 < 0)
1261                 return -1;
1262         else
1263                 return 0;
1264
1265 }
1266
1267 int ssc_total=0,ssc_swaps=0;
1268
1269 //short the children of segment to render in the correct order
1270 //returns non-zero if swaps were made
1271 int sort_seg_children(segment *seg,int n_children,short *child_list)
1272 {
1273         int i,j;
1274         int r;
1275         int made_swaps,count;
1276
1277         if (n_children == 0) return 0;
1278
1279  ssc_total++;
1280
1281         //for each child,  compare with other children and see if order matters
1282         //if order matters, fix if wrong
1283
1284         count = 0;
1285
1286         do {
1287                 made_swaps = 0;
1288
1289                 for (i=0;i<n_children-1;i++)
1290                         for (j=i+1;child_list[i]!=-1 && j<n_children;j++)
1291                                 if (child_list[j]!=-1) {
1292                                         r = compare_children(seg,child_list[i],child_list[j]);
1293
1294                                         if (r == 1) {
1295                                                 int temp = child_list[i];
1296                                                 child_list[i] = child_list[j];
1297                                                 child_list[j] = temp;
1298                                                 made_swaps=1;
1299                                         }
1300                                 }
1301
1302         } while (made_swaps && ++count<n_children);
1303
1304  if (count)
1305   ssc_swaps++;
1306
1307         return count;
1308 }
1309
1310 void add_obj_to_seglist(int objnum,int listnum)
1311 {
1312         int i,checkn,marker;
1313
1314         checkn = listnum;
1315
1316         //first, find a slot
1317
1318 //mprintf((0,"adding obj %d to %d",objnum,listnum));
1319
1320         do {
1321
1322                 for (i=0;render_obj_list[checkn][i] >= 0;i++);
1323
1324                 Assert(i < OBJS_PER_SEG);
1325
1326                 marker = render_obj_list[checkn][i];
1327
1328                 if (marker != -1) {
1329                         checkn = -marker;
1330                         //Assert(checkn < MAX_RENDER_SEGS+N_EXTRA_OBJ_LISTS);
1331                         if (checkn >= MAX_RENDER_SEGS+N_EXTRA_OBJ_LISTS) {
1332                                 Int3();
1333                                 return;
1334                         }
1335                 }
1336
1337         } while (marker != -1);
1338
1339 //mprintf((0,"  slot %d,%d",checkn,i));
1340
1341
1342         //now we have found a slot.  put object in it
1343
1344         if (i != OBJS_PER_SEG-1) {
1345
1346                 render_obj_list[checkn][i] = objnum;
1347                 render_obj_list[checkn][i+1] = -1;
1348         }
1349         else {                          //chain to additional list
1350                 int lookn;
1351
1352                 //find an available sublist
1353
1354                 for (lookn=MAX_RENDER_SEGS;render_obj_list[lookn][0]!=-1 && lookn<MAX_RENDER_SEGS+N_EXTRA_OBJ_LISTS;lookn++);
1355
1356                 //Assert(lookn<MAX_RENDER_SEGS+N_EXTRA_OBJ_LISTS);
1357                 if (lookn >= MAX_RENDER_SEGS+N_EXTRA_OBJ_LISTS) {
1358                         Int3();
1359                         return;
1360                 }
1361
1362                 render_obj_list[checkn][i] = -lookn;
1363                 render_obj_list[lookn][0] = objnum;
1364                 render_obj_list[lookn][1] = -1;
1365
1366         }
1367
1368 //mprintf((0,"  added!\n"));
1369
1370 }
1371
1372 #define SORT_LIST_SIZE 100
1373
1374 typedef struct sort_item {
1375         int objnum;
1376         fix dist;
1377 } sort_item;
1378
1379 sort_item sort_list[SORT_LIST_SIZE];
1380 int n_sort_items;
1381
1382 //compare function for object sort.
1383 int sort_func(const sort_item *a,const sort_item *b)
1384 {
1385         fix delta_dist;
1386         object *obj_a,*obj_b;
1387
1388         delta_dist = a->dist - b->dist;
1389
1390         obj_a = &Objects[a->objnum];
1391         obj_b = &Objects[b->objnum];
1392
1393         if (abs(delta_dist) < (obj_a->size + obj_b->size)) {            //same position
1394
1395                 //these two objects are in the same position.  see if one is a fireball
1396                 //or laser or something that should plot on top.  Don't do this for
1397                 //the afterburner blobs, though.
1398
1399                 if (obj_a->type == OBJ_WEAPON || (obj_a->type == OBJ_FIREBALL && obj_a->id != VCLIP_AFTERBURNER_BLOB))
1400                         if (!(obj_b->type == OBJ_WEAPON || obj_b->type == OBJ_FIREBALL))
1401                                 return -1;      //a is weapon, b is not, so say a is closer
1402                         else;                           //both are weapons
1403                 else
1404                         if (obj_b->type == OBJ_WEAPON || (obj_b->type == OBJ_FIREBALL && obj_b->id != VCLIP_AFTERBURNER_BLOB))
1405                                 return 1;       //b is weapon, a is not, so say a is farther
1406
1407                 //no special case, fall through to normal return
1408         }
1409
1410         return delta_dist;      //return distance
1411 }
1412
1413 void build_object_lists(int n_segs)
1414 {
1415         int nn;
1416
1417 //mprintf((0,"build n_segs=%d",n_segs));
1418
1419         for (nn=0;nn<MAX_RENDER_SEGS+N_EXTRA_OBJ_LISTS;nn++)
1420                 render_obj_list[nn][0] = -1;
1421
1422         for (nn=0;nn<n_segs;nn++) {
1423                 int segnum;
1424
1425                 segnum = Render_list[nn];
1426
1427 //mprintf((0,"nn=%d seg=%d ",nn,segnum));
1428
1429                 if (segnum != -1) {
1430                         int objnum;
1431                         object *obj;
1432
1433                         for (objnum=Segments[segnum].objects;objnum!=-1;objnum = obj->next) {
1434                                 int new_segnum,did_migrate,list_pos;
1435
1436                                 obj = &Objects[objnum];
1437
1438                                 Assert( obj->segnum == segnum );
1439
1440                                 if (obj->flags & OF_ATTACHED)
1441                                         continue;               //ignore this object
1442
1443                                 new_segnum = segnum;
1444                                 list_pos = nn;
1445
1446 //mprintf((0,"objnum=%d ",objnum));
1447                                 if (obj->type != OBJ_CNTRLCEN && !(obj->type==OBJ_ROBOT && obj->id==65))                //don't migrate controlcen
1448                                 do {
1449                                         segmasks m;
1450
1451                                         did_migrate = 0;
1452
1453                                         m = get_seg_masks(&obj->pos,new_segnum,obj->size);
1454
1455                                         if (m.sidemask) {
1456                                                 int sn,sf;
1457
1458                                                 for (sn=0,sf=1;sn<6;sn++,sf<<=1)
1459                                                         if (m.sidemask & sf) {
1460                                                                 segment *seg = &Segments[new_segnum];
1461
1462                                                                 if (WALL_IS_DOORWAY(seg,sn) & WID_FLY_FLAG) {           //can explosion migrate through
1463                                                                         int child = seg->children[sn];
1464                                                                         int checknp;
1465
1466                                                                         for (checknp=list_pos;checknp--;)
1467                                                                                 if (Render_list[checknp] == child) {
1468 //mprintf((0,"mig from %d to %d ",new_segnum,child));
1469                                                                                         new_segnum = child;
1470                                                                                         list_pos = checknp;
1471                                                                                         did_migrate = 1;
1472                                                                                 }
1473                                                                 }
1474                                                         }
1475                                         }
1476
1477                                 } while (0);    //while (did_migrate);
1478
1479                                 add_obj_to_seglist(objnum,list_pos);
1480
1481                         }
1482
1483                 }
1484         }
1485
1486 //mprintf((0,"done build "));
1487
1488         //now that there's a list for each segment, sort the items in those lists
1489         for (nn=0;nn<n_segs;nn++) {
1490                 int segnum;
1491
1492                 segnum = Render_list[nn];
1493
1494 //mprintf((0,"nn=%d seg=%d ",nn,segnum));
1495
1496                 if (segnum != -1) {
1497                         int t,lookn,i,n;
1498
1499                         //first count the number of objects & copy into sort list
1500
1501                         lookn = nn;
1502                         i = n_sort_items = 0;
1503                         while ((t=render_obj_list[lookn][i++])!=-1)
1504                                 if (t<0)
1505                                         {lookn = -t; i=0;}
1506                                 else
1507                                         if (n_sort_items < SORT_LIST_SIZE-1) {          //add if room
1508                                                 sort_list[n_sort_items].objnum = t;
1509                                                 //NOTE: maybe use depth, not dist - quicker computation
1510                                                 sort_list[n_sort_items].dist = vm_vec_dist_quick(&Objects[t].pos,&Viewer_eye);
1511                                                 n_sort_items++;
1512                                         }
1513                                         else {                  //no room for object
1514                                                 int ii;
1515
1516                                                 #ifndef NDEBUG
1517                                                 FILE *tfile=fopen("sortlist.out","wt");
1518
1519                                                 //I find this strange, so I'm going to write out
1520                                                 //some information to look at later
1521                                                 if (tfile) {
1522                                                         for (ii=0;ii<SORT_LIST_SIZE;ii++) {
1523                                                                 int objnum = sort_list[ii].objnum;
1524
1525                                                                 fprintf(tfile,"Obj %3d  Type = %2d  Id = %2d  Dist = %08x  Segnum = %3d\n",
1526                                                                         objnum,Objects[objnum].type,Objects[objnum].id,sort_list[ii].dist,Objects[objnum].segnum);
1527                                                         }
1528                                                         fclose(tfile);
1529                                                 }
1530                                                 #endif
1531
1532                                                 Int3(); //Get Matt!!!
1533
1534                                                 //Now try to find a place for this object by getting rid
1535                                                 //of an object we don't care about
1536
1537                                                 for (ii=0;ii<SORT_LIST_SIZE;ii++) {
1538                                                         int objnum = sort_list[ii].objnum;
1539                                                         object *obj = &Objects[objnum];
1540                                                         int type = obj->type;
1541
1542                                                         //replace debris & fireballs
1543                                                         if (type == OBJ_DEBRIS || type == OBJ_FIREBALL) {
1544                                                                 fix dist = vm_vec_dist_quick(&Objects[t].pos,&Viewer_eye);
1545
1546                                                                 //don't replace same kind of object unless new
1547                                                                 //one is closer
1548
1549                                                                 if (Objects[t].type != type || dist < sort_list[ii].dist) {
1550                                                                         sort_list[ii].objnum = t;
1551                                                                         sort_list[ii].dist = dist;
1552                                                                         break;
1553                                                                 }
1554                                                         }
1555                                                 }
1556
1557                                                 Int3(); //still couldn't find a slot
1558                                         }
1559
1560
1561                         //now call qsort
1562                 #if defined(__WATCOMC__) || defined(MACINTOSH)
1563                         qsort(sort_list,n_sort_items,sizeof(*sort_list),
1564                                    sort_func);
1565                 #else
1566                         qsort(sort_list,n_sort_items,sizeof(*sort_list),
1567                                         (int (*)(const void*,const void*))sort_func);
1568                 #endif
1569
1570                         //now copy back into list
1571
1572                         lookn = nn;
1573                         i = 0;
1574                         n = n_sort_items;
1575                         while ((t=render_obj_list[lookn][i])!=-1 && n>0)
1576                                 if (t<0)
1577                                         {lookn = -t; i=0;}
1578                                 else
1579                                         render_obj_list[lookn][i++] = sort_list[--n].objnum;
1580                         render_obj_list[lookn][i] = -1; //mark (possibly new) end
1581                 }
1582         }
1583 }
1584
1585 int Use_player_head_angles = 0;
1586 vms_angvec Player_head_angles;
1587
1588 extern int Num_tmaps_drawn;
1589 extern int Total_pixels;
1590 //--unused-- int Total_num_tmaps_drawn=0;
1591
1592 int Rear_view=0;
1593 extern ubyte RenderingType;
1594
1595 void start_lighting_frame(object *viewer);
1596
1597 #ifdef JOHN_ZOOM
1598 fix Zoom_factor=F1_0;
1599 #endif
1600 //renders onto current canvas
1601 void render_frame(fix eye_offset, int window_num)
1602 {
1603         int start_seg_num;
1604
1605 #if defined(POLY_ACC)
1606 //$$ not needed for Verite, probably optional for ViRGE.    pa_flush();
1607 #endif
1608
1609 //Total_num_tmaps_drawn += Num_tmaps_drawn;
1610 //if ((FrameCount > 0) && (Total_num_tmaps_drawn))
1611 //      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));
1612 //Num_tmaps_drawn = 0;
1613
1614         if (Endlevel_sequence) {
1615                 render_endlevel_frame(eye_offset);
1616                 FrameCount++;
1617                 return;
1618         }
1619
1620 #ifdef NEWDEMO
1621         if ( Newdemo_state == ND_STATE_RECORDING && eye_offset >= 0 )   {
1622
1623           //    mprintf ((0,"Objnum=%d objtype=%d objid=%d\n",Viewer-Objects,Viewer->type,Viewer->id));
1624
1625       if (RenderingType==0)
1626                 newdemo_record_start_frame(FrameCount, FrameTime );
1627       if (RenderingType!=255)
1628                 newdemo_record_viewer_object(Viewer);
1629         }
1630 #endif
1631
1632    //Here:
1633
1634         start_lighting_frame(Viewer);           //this is for ugly light-smoothing hack
1635
1636         g3_start_frame();
1637
1638         Viewer_eye = Viewer->pos;
1639
1640 //      if (Viewer->type == OBJ_PLAYER && (Cockpit_mode!=CM_REAR_VIEW))
1641 //              vm_vec_scale_add2(&Viewer_eye,&Viewer->orient.fvec,(Viewer->size*3)/4);
1642
1643         if (eye_offset) {
1644                 vm_vec_scale_add2(&Viewer_eye,&Viewer->orient.rvec,eye_offset);
1645         }
1646
1647         #ifdef EDITOR
1648         if (Function_mode==FMODE_EDITOR)
1649                 Viewer_eye = Viewer->pos;
1650         #endif
1651
1652         start_seg_num = find_point_seg(&Viewer_eye,Viewer->segnum);
1653
1654         if (start_seg_num==-1)
1655                 start_seg_num = Viewer->segnum;
1656
1657         if (Viewer==ConsoleObject && Use_player_head_angles) {
1658                 vms_matrix headm,viewm;
1659                 vm_angles_2_matrix(&headm,&Player_head_angles);
1660                 vm_matrix_x_matrix(&viewm,&Viewer->orient,&headm);
1661                 g3_set_view_matrix(&Viewer_eye,&viewm,Render_zoom);
1662         //@@} else if ((Cockpit_mode==CM_REAR_VIEW) && (Viewer==ConsoleObject)) {
1663         } else if (Rear_view && (Viewer==ConsoleObject)) {
1664                 vms_matrix headm,viewm;
1665                 Player_head_angles.p = Player_head_angles.b = 0;
1666                 Player_head_angles.h = 0x7fff;
1667                 vm_angles_2_matrix(&headm,&Player_head_angles);
1668                 vm_matrix_x_matrix(&viewm,&Viewer->orient,&headm);
1669                 g3_set_view_matrix(&Viewer_eye,&viewm,Render_zoom);
1670         } else  {
1671 #ifdef JOHN_ZOOM
1672                 if (keyd_pressed[KEY_RSHIFT] )  {
1673                         Zoom_factor += FrameTime*4;
1674                         if (Zoom_factor > F1_0*5 ) Zoom_factor=F1_0*5;
1675                 } else {
1676                         Zoom_factor -= FrameTime*4;
1677                         if (Zoom_factor < F1_0 ) Zoom_factor = F1_0;
1678                 }
1679                 g3_set_view_matrix(&Viewer_eye,&Viewer->orient,fixdiv(Render_zoom,Zoom_factor));
1680 #else
1681                 g3_set_view_matrix(&Viewer_eye,&Viewer->orient,Render_zoom);
1682 #endif
1683         }
1684
1685         if (Clear_window == 1) {
1686                 if (Clear_window_color == -1)
1687                         Clear_window_color = BM_XRGB(0, 0, 0);  //BM_XRGB(31, 15, 7);
1688                 gr_clear_canvas(Clear_window_color);
1689         }
1690         #ifndef NDEBUG
1691         if (Show_only_curside)
1692                 gr_clear_canvas(Clear_window_color);
1693         #endif
1694
1695         render_mine(start_seg_num,eye_offset, window_num);
1696
1697         if (Use_player_head_angles )
1698                 draw_3d_reticle(eye_offset);
1699
1700         g3_end_frame();
1701
1702    //RenderingType=0;
1703
1704         // -- Moved from here by MK, 05/17/95, wrong if multiple renders/frame! FrameCount++;           //we have rendered a frame
1705 }
1706
1707 int first_terminal_seg;
1708
1709 void update_rendered_data(int window_num, object *viewer, int rear_view_flag, int user)
1710 {
1711         Assert(window_num < MAX_RENDERED_WINDOWS);
1712         Window_rendered_data[window_num].frame = FrameCount;
1713         Window_rendered_data[window_num].viewer = viewer;
1714         Window_rendered_data[window_num].rear_view = rear_view_flag;
1715         Window_rendered_data[window_num].user = user;
1716 }
1717
1718 //build a list of segments to be rendered
1719 //fills in Render_list & N_render_segs
1720 void build_segment_list(int start_seg_num, int window_num)
1721 {
1722         int     lcnt,scnt,ecnt;
1723         int     l,c;
1724         int     ch;
1725
1726         memset(visited, 0, sizeof(visited[0])*(Highest_segment_index+1));
1727         memset(render_pos, -1, sizeof(render_pos[0])*(Highest_segment_index+1));
1728         //memset(no_render_flag, 0, sizeof(no_render_flag[0])*(MAX_RENDER_SEGS));
1729         memset(processed, 0, sizeof(processed));
1730
1731         #ifndef NDEBUG
1732         memset(visited2, 0, sizeof(visited2[0])*(Highest_segment_index+1));
1733         #endif
1734
1735         lcnt = scnt = 0;
1736
1737         Render_list[lcnt] = start_seg_num; visited[start_seg_num]=1;
1738         Seg_depth[lcnt] = 0;
1739         lcnt++;
1740         ecnt = lcnt;
1741         render_pos[start_seg_num] = 0;
1742
1743         #ifndef NDEBUG
1744         if (pre_draw_segs)
1745                 render_segment(start_seg_num, window_num);
1746         #endif
1747
1748         render_windows[0].left=render_windows[0].top=0;
1749         render_windows[0].right=grd_curcanv->cv_bitmap.bm_w-1;
1750         render_windows[0].bot=grd_curcanv->cv_bitmap.bm_h-1;
1751
1752         //breadth-first renderer
1753
1754         //build list
1755
1756         for (l=0;l<Render_depth;l++) {
1757
1758                 //while (scnt < ecnt) {
1759                 for (scnt=0;scnt < ecnt;scnt++) {
1760                         int rotated,segnum;
1761                         window *check_w;
1762                         short child_list[MAX_SIDES_PER_SEGMENT];                //list of ordered sides to process
1763                         int n_children;                                                                         //how many sides in child_list
1764                         segment *seg;
1765
1766                         if (processed[scnt])
1767                                 continue;
1768
1769                         processed[scnt]=1;
1770
1771                         segnum = Render_list[scnt];
1772                         check_w = &render_windows[scnt];
1773
1774                         #ifndef NDEBUG
1775                         if (draw_boxes)
1776                                 draw_window_box(RED,check_w->left,check_w->top,check_w->right,check_w->bot);
1777                         #endif
1778
1779                         if (segnum == -1) continue;
1780
1781                         seg = &Segments[segnum];
1782                         rotated=0;
1783
1784                         //look at all sides of this segment.
1785                         //tricky code to look at sides in correct order follows
1786
1787                         for (c=n_children=0;c<MAX_SIDES_PER_SEGMENT;c++) {              //build list of sides
1788                                 int wid;
1789
1790                                 wid = WALL_IS_DOORWAY(seg, c);
1791
1792                                 ch=seg->children[c];
1793
1794                                 if ( (window_check || !visited[ch]) && (wid & WID_RENDPAST_FLAG) ) {
1795                                         if (behind_check) {
1796                                                 byte *sv = Side_to_verts[c];
1797                                                 ubyte codes_and=0xff;
1798                                                 int i;
1799
1800                                                 rotate_list(8,seg->verts);
1801                                                 rotated=1;
1802
1803                                                 for (i=0;i<4;i++)
1804                                                         codes_and &= Segment_points[seg->verts[sv[i]]].p3_codes;
1805
1806                                                 if (codes_and & CC_BEHIND) continue;
1807
1808                                         }
1809                                         child_list[n_children++] = c;
1810                                 }
1811                         }
1812
1813                         //now order the sides in some magical way
1814
1815                         if (new_seg_sorting)
1816                                 sort_seg_children(seg,n_children,child_list);
1817
1818                         //for (c=0;c<MAX_SIDES_PER_SEGMENT;c++) {
1819                         //      ch=seg->children[c];
1820
1821                         for (c=0;c<n_children;c++) {
1822                                 int siden;
1823
1824                                 siden = child_list[c];
1825                                 ch=seg->children[siden];
1826                                 //if ( (window_check || !visited[ch])&& (WALL_IS_DOORWAY(seg, c))) {
1827                                 {
1828                                         if (window_check) {
1829                                                 int i;
1830                                                 ubyte codes_and_3d,codes_and_2d;
1831                                                 short _x,_y,min_x=32767,max_x=-32767,min_y=32767,max_y=-32767;
1832                                                 int no_proj_flag=0;     //a point wasn't projected
1833
1834                                                 if (rotated<2) {
1835                                                         if (!rotated)
1836                                                                 rotate_list(8,seg->verts);
1837                                                         project_list(8,seg->verts);
1838                                                         rotated=2;
1839                                                 }
1840
1841                                                 for (i=0,codes_and_3d=codes_and_2d=0xff;i<4;i++) {
1842                                                         int p = seg->verts[Side_to_verts[siden][i]];
1843                                                         g3s_point *pnt = &Segment_points[p];
1844
1845                                                         if (! (pnt->p3_flags&PF_PROJECTED)) {no_proj_flag=1; break;}
1846
1847                                                         _x = f2i(pnt->p3_sx);
1848                                                         _y = f2i(pnt->p3_sy);
1849
1850                                                         codes_and_3d &= pnt->p3_codes;
1851                                                         codes_and_2d &= code_window_point(_x,_y,check_w);
1852
1853                                                         #ifndef NDEBUG
1854                                                         if (draw_edges) {
1855                                                                 gr_setcolor(BM_XRGB(31,0,31));
1856                                                                 gr_line(pnt->p3_sx,pnt->p3_sy,
1857                                                                         Segment_points[seg->verts[Side_to_verts[siden][(i+1)%4]]].p3_sx,
1858                                                                         Segment_points[seg->verts[Side_to_verts[siden][(i+1)%4]]].p3_sy);
1859                                                         }
1860                                                         #endif
1861
1862                                                         if (_x < min_x) min_x = _x;
1863                                                         if (_x > max_x) max_x = _x;
1864
1865                                                         if (_y < min_y) min_y = _y;
1866                                                         if (_y > max_y) max_y = _y;
1867
1868                                                 }
1869
1870                                                 #ifndef NDEBUG
1871                                                 if (draw_boxes)
1872                                                         draw_window_box(WHITE,min_x,min_y,max_x,max_y);
1873                                                 #endif
1874
1875                                                 if (no_proj_flag || (!codes_and_3d && !codes_and_2d)) { //maybe add this segment
1876                                                         int rp = render_pos[ch];
1877                                                         window *new_w = &render_windows[lcnt];
1878
1879                                                         if (no_proj_flag) *new_w = *check_w;
1880                                                         else {
1881                                                                 new_w->left  = max(check_w->left,min_x);
1882                                                                 new_w->right = min(check_w->right,max_x);
1883                                                                 new_w->top   = max(check_w->top,min_y);
1884                                                                 new_w->bot   = min(check_w->bot,max_y);
1885                                                         }
1886
1887                                                         //see if this seg already visited, and if so, does current window
1888                                                         //expand the old window?
1889                                                         if (rp != -1) {
1890                                                                 if (new_w->left < render_windows[rp].left ||
1891                                                                                  new_w->top < render_windows[rp].top ||
1892                                                                                  new_w->right > render_windows[rp].right ||
1893                                                                                  new_w->bot > render_windows[rp].bot) {
1894
1895                                                                         new_w->left  = min(new_w->left,render_windows[rp].left);
1896                                                                         new_w->right = max(new_w->right,render_windows[rp].right);
1897                                                                         new_w->top   = min(new_w->top,render_windows[rp].top);
1898                                                                         new_w->bot   = max(new_w->bot,render_windows[rp].bot);
1899
1900                                                                         if (no_migrate_segs) {
1901                                                                                 //no_render_flag[lcnt] = 1;
1902                                                                                 Render_list[lcnt] = -1;
1903                                                                                 render_windows[rp] = *new_w;            //get updated window
1904                                                                                 processed[rp] = 0;              //force reprocess
1905                                                                                 goto no_add;
1906                                                                         }
1907                                                                         else
1908                                                                                 Render_list[rp]=-1;
1909                                                                 }
1910                                                                 else goto no_add;
1911                                                         }
1912
1913                                                         #ifndef NDEBUG
1914                                                         if (draw_boxes)
1915                                                                 draw_window_box(5,new_w->left,new_w->top,new_w->right,new_w->bot);
1916                                                         #endif
1917
1918                                                         render_pos[ch] = lcnt;
1919                                                         Render_list[lcnt] = ch;
1920                                                         Seg_depth[lcnt] = l;
1921                                                         lcnt++;
1922                                                         if (lcnt >= MAX_RENDER_SEGS) {mprintf((0,"Too many segs in render list!!\n")); goto done_list;}
1923                                                         visited[ch] = 1;
1924
1925                                                         #ifndef NDEBUG
1926                                                         if (pre_draw_segs)
1927                                                                 render_segment(ch, window_num);
1928                                                         #endif
1929 no_add:
1930         ;
1931
1932                                                 }
1933                                         }
1934                                         else {
1935                                                 Render_list[lcnt] = ch;
1936                                                 Seg_depth[lcnt] = l;
1937                                                 lcnt++;
1938                                                 if (lcnt >= MAX_RENDER_SEGS) {mprintf((0,"Too many segs in render list!!\n")); goto done_list;}
1939                                                 visited[ch] = 1;
1940                                         }
1941                                 }
1942                         }
1943                 }
1944
1945                 scnt = ecnt;
1946                 ecnt = lcnt;
1947
1948         }
1949 done_list:
1950
1951         lcnt_save = lcnt;
1952         scnt_save = scnt;
1953
1954         first_terminal_seg = scnt;
1955         N_render_segs = lcnt;
1956
1957 }
1958
1959 //renders onto current canvas
1960 void render_mine(int start_seg_num,fix eye_offset, int window_num)
1961 {
1962         int             i;
1963         int             nn;
1964
1965         //      Initialize number of objects (actually, robots!) rendered this frame.
1966         Window_rendered_data[window_num].num_objects = 0;
1967
1968 #ifdef LASER_HACK
1969         Hack_nlasers = 0;
1970 #endif
1971
1972         #ifndef NDEBUG
1973         for (i=0;i<=Highest_object_index;i++)
1974                 object_rendered[i] = 0;
1975         #endif
1976
1977         //set up for rendering
1978
1979         render_start_frame();
1980
1981
1982         #if defined(EDITOR) && !defined(NDEUBG)
1983         if (Show_only_curside) {
1984                 rotate_list(8,Cursegp->verts);
1985                 render_side(Cursegp,Curside);
1986                 goto done_rendering;
1987         }
1988         #endif
1989
1990
1991         #ifdef EDITOR
1992         if (_search_mode)       {
1993                 //lcnt = lcnt_save;
1994                 //scnt = scnt_save;
1995         }
1996         else
1997         #endif
1998                 //NOTE LINK TO ABOVE!!
1999                 build_segment_list(start_seg_num, window_num);          //fills in Render_list & N_render_segs
2000
2001         //render away
2002
2003         #ifndef NDEBUG
2004         if (!window_check) {
2005                 Window_clip_left  = Window_clip_top = 0;
2006                 Window_clip_right = grd_curcanv->cv_bitmap.bm_w-1;
2007                 Window_clip_bot   = grd_curcanv->cv_bitmap.bm_h-1;
2008         }
2009         #endif
2010
2011         #ifndef NDEBUG
2012         if (!(_search_mode)) {
2013                 int i;
2014
2015                 for (i=0;i<N_render_segs;i++) {
2016                         int segnum;
2017
2018                         segnum = Render_list[i];
2019
2020                         if (segnum != -1)
2021                         {
2022                                 if (visited2[segnum])
2023                                         Int3();         //get Matt
2024                                 else
2025                                         visited2[segnum] = 1;
2026                         }
2027                 }
2028         }
2029         #endif
2030
2031         if (!(_search_mode))
2032                 build_object_lists(N_render_segs);
2033
2034         if (eye_offset<=0)              // Do for left eye or zero.
2035                 set_dynamic_light();
2036
2037         if (!_search_mode && Clear_window == 2) {
2038                 if (first_terminal_seg < N_render_segs) {
2039                         int i;
2040
2041                         if (Clear_window_color == -1)
2042                                 Clear_window_color = BM_XRGB(0, 0, 0);  //BM_XRGB(31, 15, 7);
2043
2044                         gr_setcolor(Clear_window_color);
2045
2046                         for (i=first_terminal_seg; i<N_render_segs; i++) {
2047                                 if (Render_list[i] != -1) {
2048                                         #ifndef NDEBUG
2049                                         if ((render_windows[i].left == -1) || (render_windows[i].top == -1) || (render_windows[i].right == -1) || (render_windows[i].bot == -1))
2050                                                 Int3();
2051                                         else
2052                                         #endif
2053                                                 //NOTE LINK TO ABOVE!
2054                                                 gr_rect(render_windows[i].left, render_windows[i].top, render_windows[i].right, render_windows[i].bot);
2055                                 }
2056                         }
2057                 }
2058         }
2059
2060         for (nn=N_render_segs;nn--;) {
2061                 int segnum;
2062                 int objnp;
2063
2064                 // Interpolation_method = 0;
2065                 segnum = Render_list[nn];
2066                 Current_seg_depth = Seg_depth[nn];
2067
2068                 //if (!no_render_flag[nn])
2069                 if (segnum!=-1 && (_search_mode || visited[segnum]!=-1)) {
2070                         //set global render window vars
2071
2072                         if (window_check) {
2073                                 Window_clip_left  = render_windows[nn].left;
2074                                 Window_clip_top   = render_windows[nn].top;
2075                                 Window_clip_right = render_windows[nn].right;
2076                                 Window_clip_bot   = render_windows[nn].bot;
2077                         }
2078
2079                         //mprintf((0," %d",segnum));
2080
2081                         render_segment(segnum, window_num);
2082                         visited[segnum]=255;
2083
2084                         if (window_check) {             //reset for objects
2085                                 Window_clip_left  = Window_clip_top = 0;
2086                                 Window_clip_right = grd_curcanv->cv_bitmap.bm_w-1;
2087                                 Window_clip_bot   = grd_curcanv->cv_bitmap.bm_h-1;
2088                         }
2089
2090                         if (migrate_objects) {
2091                                 //int n_expl_objs=0,expl_objs[5],i;
2092                                 int listnum;
2093                                 int save_linear_depth = Max_linear_depth;
2094
2095                                 Max_linear_depth = Max_linear_depth_objects;
2096
2097                                 listnum = nn;
2098
2099                                 //mprintf((0,"render objs seg %d",segnum));
2100
2101                                 for (objnp=0;render_obj_list[listnum][objnp]!=-1;)      {
2102                                         int ObjNumber = render_obj_list[listnum][objnp];
2103
2104                                         if (ObjNumber >= 0) {
2105
2106                                                 //mprintf( (0, "Type: %d\n", Objects[ObjNumber].type ));
2107
2108                                                 //if (Objects[ObjNumber].type == OBJ_FIREBALL && n_expl_objs<5) {
2109                                                 //      expl_objs[n_expl_objs++] = ObjNumber;
2110                                                 //} else
2111                                                 #ifdef LASER_HACK
2112                                                 if (    (Objects[ObjNumber].type==OBJ_WEAPON) &&                                                                //if its a weapon
2113                                                                 (Objects[ObjNumber].lifeleft==Laser_max_time ) &&       //  and its in it's first frame
2114                                                                 (Hack_nlasers< MAX_HACKED_LASERS) &&                                                                    //  and we have space for it
2115                                                                 (Objects[ObjNumber].laser_info.parent_num>-1) &&                                        //  and it has a parent
2116                                                                 ((Viewer-Objects)==Objects[ObjNumber].laser_info.parent_num)    //  and it's parent is the viewer
2117                                                    )            {
2118                                                         Hack_laser_list[Hack_nlasers++] = ObjNumber;                                                            //then make it draw after everything else.
2119                                                         //mprintf( (0, "O%d ", ObjNumber ));
2120                                                 } else
2121                                                 #endif
2122                                                         do_render_object(ObjNumber, window_num);        // note link to above else
2123
2124                                                 objnp++;
2125                                         }
2126                                         else {
2127
2128                                                 listnum = -ObjNumber;
2129                                                 objnp = 0;
2130
2131                                         }
2132
2133                                 }
2134
2135                                 //for (i=0;i<n_expl_objs;i++)
2136                                 //      do_render_object(expl_objs[i], window_num);
2137
2138                                 //mprintf((0,"done seg %d\n",segnum));
2139
2140                                 Max_linear_depth = save_linear_depth;
2141
2142                         }
2143
2144                 }
2145         }
2146
2147         //mprintf((0,"\n"));
2148
2149
2150 #ifdef LASER_HACK
2151         // Draw the hacked lasers last
2152         for (i=0; i < Hack_nlasers; i++ )       {
2153                 //mprintf( (0, "D%d ", Hack_laser_list[i] ));
2154                 do_render_object(Hack_laser_list[i], window_num);
2155         }
2156 #endif
2157
2158         // -- commented out by mk on 09/14/94...did i do a good thing??  object_render_targets();
2159
2160 #ifdef EDITOR
2161         #ifndef NDEUBG
2162         //draw curedge stuff
2163         if (Outline_mode) outline_seg_side(Cursegp,Curside,Curedge,Curvert);
2164         #endif
2165
2166 done_rendering:
2167         ;
2168
2169 #endif
2170
2171 }
2172 #ifdef EDITOR
2173
2174 extern int render_3d_in_big_window;
2175
2176 //finds what segment is at a given x&y -  seg,side,face are filled in
2177 //works on last frame rendered. returns true if found
2178 //if seg<0, then an object was found, and the object number is -seg-1
2179 int find_seg_side_face(short x,short y,int *seg,int *side,int *face,int *poly)
2180 {
2181         _search_mode = -1;
2182
2183         _search_x = x; _search_y = y;
2184
2185         found_seg = -1;
2186
2187         if (render_3d_in_big_window) {
2188                 grs_canvas temp_canvas;
2189
2190                 gr_init_sub_canvas(&temp_canvas,canv_offscreen,0,0,
2191                         LargeView.ev_canv->cv_bitmap.bm_w,LargeView.ev_canv->cv_bitmap.bm_h);
2192
2193                 gr_set_current_canvas(&temp_canvas);
2194
2195                 render_frame(0, 0);
2196         }
2197         else {
2198                 gr_set_current_canvas(&VR_render_sub_buffer[0]);        //render off-screen
2199                 render_frame(0, 0);
2200         }
2201
2202         _search_mode = 0;
2203
2204         *seg = found_seg;
2205         *side = found_side;
2206         *face = found_face;
2207         *poly = found_poly;
2208
2209 //      mprintf((0,"found seg=%d, side=%d, face=%d, poly=%d\n",found_seg,found_side,found_face,found_poly));
2210
2211         return (found_seg!=-1);
2212
2213 }
2214
2215 #endif