src/weapon/trails.cpp

   1 /*
   2  * Copyright (C) Volition, Inc. 1999.  All rights reserved.
   3  *
   4  * All source code herein is the property of Volition, Inc. You may not sell
   5  * or otherwise commercially exploit the source or things you created based on
   6  * the source.
   7  */
   8
   9 /*
  10  * $Logfile: /Freespace2/code/Weapon/Trails.cpp $
  11  * $Revision$
  12  * $Date$
  13  * $Author$
  14  *
  15  * Code for missile trails
  16  *
  17  * $Log$
  18  * Revision 1.3  2002/06/09 04:41:29  relnev
  19  * added copyright header
  20  *
  21  * Revision 1.2  2002/05/07 03:16:53  theoddone33
  22  * The Great Newline Fix
  23  *
  24  * Revision 1.1.1.1  2002/05/03 03:28:11  root
  25  * Initial import.
  26  *
  27  *
  28  * 7     6/23/99 2:23p Mattk
  29  * Fixed detail level trail rendering problem.
  30  *
  31  * 6     6/22/99 7:03p Dave
  32  * New detail options screen.
  33  *
  34  * 5     2/23/99 8:11p Dave
  35  * Tidied up dogfight mode. Fixed TvT ship type problems for alpha wing.
  36  * Small pass over todolist items.
  37  *
  38  * 4     2/17/99 2:11p Dave
  39  * First full run of squad war. All freespace and tracker side stuff
  40  * works.
  41  *
  42  * 3     11/14/98 5:33p Dave
  43  * Lots of nebula work. Put in ship contrails.
  44  *
  45  * 2     10/07/98 10:54a Dave
  46  * Initial checkin.
  47  *
  48  * 1     10/07/98 10:51a Dave
  49  *
  50  * 9     5/13/98 3:10p John
  51  * made detail slider for weapon rendering change the distance that lasers
  52  * become non-textured.  The lowest setting turns off missile trail
  53  * rendering.
  54  *
  55  * 8     5/08/98 7:09p Dave
  56  * Lots of UI tweaking.
  57  *
  58  * 7     4/10/98 5:20p John
  59  * Changed RGB in lighting structure to be ubytes.  Removed old
  60  * not-necessary 24 bpp software stuff.
  61  *
  62  * 6     3/31/98 5:19p John
  63  * Removed demo/save/restore.  Made NDEBUG defined compile.  Removed a
  64  * bunch of debug stuff out of player file.  Made model code be able to
  65  * unload models and malloc out only however many models are needed.
  66  *
  67  *
  68  * 5     3/23/98 5:00p John
  69  * Improved missile trails.  Made smooth alpha under hardware.  Made end
  70  * taper.  Made trail touch weapon.
  71  *
  72  * 4     1/23/98 5:08p John
  73  * Took L out of vertex structure used B (blue) instead.   Took all small
  74  * fireballs out of fireball types and used particles instead.  Fixed some
  75  * debris explosion things.  Restructured fireball code.   Restructured
  76  * some lighting code.   Made dynamic lighting on by default. Made groups
  77  * of lasers only cast one light.  Made fireballs not cast light.
  78  *
  79  * 3     1/15/98 11:13a John
  80  * Added code for specifying weapon trail bitmaps in weapons.tbl
  81  *
  82  * 2     12/21/97 6:15p John
  83  * Made a seperate system for missile trails
  84  *
  85  * 1     12/21/97 5:30p John
  86  * Initial version
  87  *
  88  * $NoKeywords: $
  89  */
  90
  91 #include "pstypes.h"
  92 #include "freespace.h"
  93 #include "weapon.h"
  94 #include "linklist.h"
  95 #include "3d.h"
  96 #include "3dinternal.h"
  97 #include "bmpman.h"
  98 #include "trails.h"
  99 #include "timer.h"
 100
 101 #define MAX_TRAILS MAX_WEAPONS
 102
 103 // Stuff for missile trails doesn't need to be saved or restored... or does it?
 104 typedef struct trail {
 105         int             head, tail;                                             // pointers into the queue for the trail points
 106         vector  pos[NUM_TRAIL_SECTIONS];        // positions of trail points
 107         float           val[NUM_TRAIL_SECTIONS];        // for each point, a value that tells how much to fade out
 108         int             object_died;                                    // set to zero as long as object
 109         int             trail_stamp;                                    // trail timestamp
 110
 111         // trail info
 112         trail_info info;                                                        // this is passed when creating a trail
 113
 114         struct  trail * prev;
 115         struct  trail * next;
 116 } trail;
 117
 118
 119 int Num_trails = 0;
 120 trail Trails[MAX_TRAILS];
 121
 122 trail Trail_free_list;
 123 trail Trail_used_list;
 124
 125 // Reset everything between levels
 126 void trail_level_init()
 127 {
 128         int i;
 129
 130         Num_trails = 0;
 131         list_init( &Trail_free_list );
 132         list_init( &Trail_used_list );
 133
 134         // Link all object slots into the free list
 135         for (i=0; i<MAX_TRAILS; i++)    {
 136                 list_append(&Trail_free_list, &Trails[i] );
 137         }
 138 }
 139
 140 //returns the number of a free trail
 141 //returns -1 if no free trails
 142 int trail_create(trail_info info)
 143 {
 144         int trail_num;
 145         trail *trailp;
 146
 147         // standalone server should never create trails
 148         if(Game_mode & GM_STANDALONE_SERVER){
 149                 return -1;
 150         }
 151
 152         if ( !Detail.weapon_extras )    {
 153                 // No trails at slot 0
 154                 return -1;
 155         }
 156
 157         if (Num_trails >= MAX_TRAILS ) {
 158                 #ifndef NDEBUG
 159                 mprintf(("Trail creation failed - too many trails!\n" ));
 160                 #endif
 161                 return -1;
 162         }
 163
 164         // Find next available trail
 165         trailp = GET_FIRST(&Trail_free_list);
 166         Assert( trailp != &Trail_free_list );           // shouldn't have the dummy element
 167
 168         // remove trailp from the free list
 169         list_remove( &Trail_free_list, trailp );
 170
 171         // insert trailp onto the end of used list
 172         list_append( &Trail_used_list, trailp );
 173
 174         // increment counter
 175         Num_trails++;
 176
 177         // get objnum
 178         trail_num = trailp-Trails;
 179
 180         // Init the trail data
 181         trailp->info = info;
 182         trailp->tail = 0;
 183         trailp->head = 0;
 184         trailp->object_died = 0;
 185         trailp->trail_stamp = timestamp(trailp->info.stamp);
 186
 187         return trail_num;
 188 }
 189
 190 // output top and bottom vectors
 191 // fvec == forward vector (eye viewpoint basically. in world coords)
 192 // pos == world coordinate of the point we're calculating "around"
 193 // w == width of the diff between top and bottom around pos
 194 void trail_calc_facing_pts( vector *top, vector *bot, vector *fvec, vector *pos, float w )
 195 {
 196         vector uvec, rvec;
 197
 198         vm_vec_sub( &rvec, &Eye_position, pos );
 199         vm_vec_normalize( &rvec );
 200
 201         vm_vec_crossprod(&uvec,fvec,&rvec);
 202         vm_vec_normalize(&uvec);
 203
 204         vm_vec_scale_add( top, pos, &uvec, w/2.0f );
 205         vm_vec_scale_add( bot, pos, &uvec, -w/2.0f );
 206 }
 207
 208 // trail is on ship
 209 int trail_is_on_ship(int trail_index, ship *shipp)
 210 {
 211         int idx;
 212
 213         for(idx=0; idx<MAX_SHIP_CONTRAILS; idx++){
 214                 if(shipp->trail_num[idx] == (short)trail_index){
 215                         return 1;
 216                 }
 217         }
 218
 219         // nope
 220         return 0;
 221 }
 222
 223 // Render the trail behind a missile.
 224 // Basically a queue of points that face the viewer.
 225 void trail_render( trail * trailp )
 226 {
 227         trail_info *ti;
 228
 229         if ( trailp->tail == trailp->head ) return;
 230
 231         ti = &trailp->info;
 232
 233         vector topv, botv, *fvec, last_pos, tmp_fvec;
 234         vertex last_top, last_bot, top, bot;
 235
 236         int sections[NUM_TRAIL_SECTIONS];
 237         int num_sections = 0;
 238
 239         int n = trailp->tail;
 240
 241         // if this trail is on the player ship, and he's in any padlock view except rear view, don't draw
 242         if((Player_ship != NULL) && trail_is_on_ship(trailp - Trails, Player_ship) && (Viewer_mode & (VM_PADLOCK_UP | VM_PADLOCK_LEFT | VM_PADLOCK_RIGHT)) ){
 243                 return;
 244         }
 245
 246         do      {
 247                 n--;
 248                 if ( n < 0 ) n = NUM_TRAIL_SECTIONS-1;
 249
 250
 251                 if ( trailp->val[n] > 1.0f ) {
 252                         break;
 253                 }
 254
 255                 sections[num_sections++] = n;
 256
 257         } while ( n != trailp->head );
 258
 259         int i;
 260
 261         for (i=0; i<num_sections; i++ ) {
 262
 263                 n = sections[i];
 264
 265                 float w;
 266                 ubyte l;
 267
 268                 w = trailp->val[n]*(ti->w_end - ti->w_start) + ti->w_start;
 269                 l = (ubyte)fl2i((trailp->val[n]*(ti->a_end - ti->a_start) + ti->a_start)*255.0f);
 270
 271                 vector pos;
 272
 273                 pos = trailp->pos[n];
 274
 275                 if ( i == 0 )   {
 276                         //fvec =
 277                         //&objp->orient.fvec;
 278                         if ( num_sections > 1 ) {
 279
 280                                 vm_vec_sub(&tmp_fvec, &pos, &trailp->pos[sections[i+1]] );
 281                                 vm_vec_normalize_safe(&tmp_fvec);
 282                                 fvec = &tmp_fvec;
 283
 284                         } else {
 285                                 fvec = &tmp_fvec;
 286                                 fvec->x = 0.0f;
 287                                 fvec->y = 0.0f;
 288                                 fvec->z = 1.0f;
 289                         }
 290                 } else {
 291                         vm_vec_sub(&tmp_fvec, &last_pos, &pos );
 292                         vm_vec_normalize_safe(&tmp_fvec);
 293                         fvec = &tmp_fvec;
 294                 }
 295
 296                 trail_calc_facing_pts( &topv, &botv, fvec, &pos, w );
 297
 298                 g3_rotate_vertex( &top, &topv );
 299                 g3_rotate_vertex( &bot, &botv );
 300                 top.a = bot.a = l;
 301
 302                 if ( i > 0 )    {
 303
 304                         if ( i == num_sections-1 )      {
 305                                 // Last one...
 306                                 vector centerv;
 307                                 vm_vec_avg( &centerv, &topv, &botv );
 308                                 vertex center;
 309                                 g3_rotate_vertex( &center, &centerv );
 310                                 center.a = l;
 311
 312                                 vertex *vlist[3];
 313                                 vlist[0] = &last_top;
 314                                 vlist[1] = &last_bot;
 315                                 vlist[2] = &center;
 316
 317                                 vlist[0]->u = 0.0f;  vlist[0]->v = 1.0f;
 318                                 vlist[1]->u = 0.0f;  vlist[1]->v = 0.0f;
 319                                 vlist[2]->u = 1.0f;  vlist[2]->v = 0.5f;
 320
 321                                 gr_set_bitmap(ti->bitmap, GR_ALPHABLEND_FILTER, GR_BITBLT_MODE_NORMAL, l/255.0f );
 322                                 if ( D3D_enabled )      {
 323                                         g3_draw_poly( 3, vlist, TMAP_FLAG_TEXTURED|TMAP_FLAG_ALPHA|TMAP_FLAG_GOURAUD );
 324                                 } else {
 325                                         g3_draw_poly( 3, vlist, TMAP_FLAG_TEXTURED );
 326                                 }
 327
 328
 329                         } else {
 330                                 vertex *vlist[4];
 331                                 vlist[0] = &last_bot;
 332                                 vlist[1] = &bot;
 333                                 vlist[2] = &top;
 334                                 vlist[3] = &last_top;
 335
 336                                 vlist[0]->u = 0.0f;  vlist[0]->v = 0.0f;
 337                                 vlist[1]->u = 1.0f;  vlist[1]->v = 0.0f;
 338                                 vlist[2]->u = 1.0f;  vlist[2]->v = 1.0f;
 339                                 vlist[3]->u = 0.0f;  vlist[3]->v = 1.0f;
 340
 341                                 gr_set_bitmap(ti->bitmap, GR_ALPHABLEND_FILTER, GR_BITBLT_MODE_NORMAL, l/255.0f );
 342                                 if ( D3D_enabled )      {
 343                                         g3_draw_poly( 4, vlist, TMAP_FLAG_TEXTURED|TMAP_FLAG_ALPHA|TMAP_FLAG_GOURAUD );
 344                                 } else {
 345                                         g3_draw_poly( 4, vlist, TMAP_FLAG_TEXTURED );
 346                                 }
 347                         }
 348                 }
 349                 last_pos = pos;
 350                 last_top = top;
 351                 last_bot = bot;
 352         }
 353 }
 354
 355
 356 void trail_add_segment( int trail_num, vector *pos )
 357 {
 358         if (trail_num < 0 ) return;
 359         if (trail_num >= MAX_TRAILS ) return;
 360
 361         trail *trailp = &Trails[trail_num];
 362
 363         int next = trailp->tail;
 364         trailp->tail++;
 365         if ( trailp->tail >= NUM_TRAIL_SECTIONS )
 366                 trailp->tail = 0;
 367
 368         if ( trailp->head == trailp->tail )     {
 369                 // wrapped!!
 370                 trailp->head++;
 371                 if ( trailp->head >= NUM_TRAIL_SECTIONS )
 372                         trailp->head = 0;
 373         }
 374
 375         trailp->pos[next] = *pos;
 376         trailp->val[next] = 0.0f;
 377 }
 378
 379 void trail_set_segment( int trail_num, vector *pos )
 380 {
 381         if (trail_num < 0 ) return;
 382         if (trail_num >= MAX_TRAILS ) return;
 383
 384         trail *trailp = &Trails[trail_num];
 385
 386         int next = trailp->tail-1;
 387         if ( next < 0 ) {
 388                 next = NUM_TRAIL_SECTIONS-1;
 389         }
 390
 391         trailp->pos[next] = *pos;
 392 }
 393
 394 void trail_move_all(float frametime)
 395 {
 396         trail *trailp;
 397
 398         trailp=GET_FIRST(&Trail_used_list);
 399
 400         while ( trailp!=END_OF_LIST(&Trail_used_list) ) {
 401
 402                 int num_alive_segments = 0;
 403
 404                 if ( trailp->tail != trailp->head )     {
 405                         int n = trailp->tail;
 406                         float time_delta = frametime / trailp->info.max_life;
 407                         do      {
 408                                 n--;
 409                                 if ( n < 0 ) n = NUM_TRAIL_SECTIONS-1;
 410
 411                                 trailp->val[n] += time_delta;
 412
 413                                 if ( trailp->val[n] <= 1.0f ) {
 414                                         num_alive_segments++;   // Record how many still alive.
 415                                 }
 416
 417                         } while ( n != trailp->head );
 418                 }
 419
 420                 if ( trailp->object_died && (num_alive_segments < 1) )  {
 421                         // delete it from the list!
 422                         trail *next_one = GET_NEXT(trailp);
 423
 424                         // remove objp from the used list
 425                         list_remove( &Trail_used_list, trailp);
 426
 427                         // add objp to the end of the free
 428                         list_append( &Trail_free_list, trailp );
 429
 430                         // decrement counter
 431                         Num_trails--;
 432
 433                         Assert(Num_trails >= 0);
 434
 435                         trailp = next_one;
 436                 } else {
 437                         trailp=GET_NEXT(trailp);
 438                 }
 439         }
 440 }
 441
 442 void trail_object_died( int trail_num )
 443 {
 444         if (trail_num < 0 ) return;
 445         if (trail_num >= MAX_TRAILS ) return;
 446
 447         trail *trailp = &Trails[trail_num];
 448
 449         trailp->object_died++;
 450 }
 451
 452 void trail_render_all()
 453 {
 454         trail *trailp;
 455
 456         if ( !Detail.weapon_extras )    {
 457                 // No trails at slot 0
 458                 return;
 459         }
 460
 461         trailp=GET_FIRST(&Trail_used_list);
 462
 463         while ( trailp!=END_OF_LIST(&Trail_used_list) ) {
 464                 trail_render(trailp);
 465                 trailp=GET_NEXT(trailp);
 466         }
 467
 468 }
 469 int trail_stamp_elapsed(int trail_num)
 470 {
 471         return timestamp_elapsed(Trails[trail_num].trail_stamp);
 472 }
 473
 474 void trail_set_stamp(int trail_num)
 475 {
 476         Trails[trail_num].trail_stamp = timestamp(Trails[trail_num].info.stamp);
 477 }