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 1.4  2002/06/17 06:33:11  relnev
  19  * ryan's struct patch for gcc 2.95
  20  *
  21  * Revision 1.3  2002/06/09 04:41:29  relnev
  22  * added copyright header
  23  *
  24  * Revision 1.2  2002/05/07 03:16:53  theoddone33
  25  * The Great Newline Fix
  26  *
  27  * Revision 1.1.1.1  2002/05/03 03:28:11  root
  28  * Initial import.
  29  *
  30  *
  31  * 7     6/23/99 2:23p Mattk
  32  * Fixed detail level trail rendering problem.
  33  *
  34  * 6     6/22/99 7:03p Dave
  35  * New detail options screen.
  36  *
  37  * 5     2/23/99 8:11p Dave
  38  * Tidied up dogfight mode. Fixed TvT ship type problems for alpha wing.
  39  * Small pass over todolist items.
  40  *
  41  * 4     2/17/99 2:11p Dave
  42  * First full run of squad war. All freespace and tracker side stuff
  43  * works.
  44  *
  45  * 3     11/14/98 5:33p Dave
  46  * Lots of nebula work. Put in ship contrails.
  47  *
  48  * 2     10/07/98 10:54a Dave
  49  * Initial checkin.
  50  *
  51  * 1     10/07/98 10:51a Dave
  52  *
  53  * 9     5/13/98 3:10p John
  54  * made detail slider for weapon rendering change the distance that lasers
  55  * become non-textured.  The lowest setting turns off missile trail
  56  * rendering.
  57  *
  58  * 8     5/08/98 7:09p Dave
  59  * Lots of UI tweaking.
  60  *
  61  * 7     4/10/98 5:20p John
  62  * Changed RGB in lighting structure to be ubytes.  Removed old
  63  * not-necessary 24 bpp software stuff.
  64  *
  65  * 6     3/31/98 5:19p John
  66  * Removed demo/save/restore.  Made NDEBUG defined compile.  Removed a
  67  * bunch of debug stuff out of player file.  Made model code be able to
  68  * unload models and malloc out only however many models are needed.
  69  *
  70  *
  71  * 5     3/23/98 5:00p John
  72  * Improved missile trails.  Made smooth alpha under hardware.  Made end
  73  * taper.  Made trail touch weapon.
  74  *
  75  * 4     1/23/98 5:08p John
  76  * Took L out of vertex structure used B (blue) instead.   Took all small
  77  * fireballs out of fireball types and used particles instead.  Fixed some
  78  * debris explosion things.  Restructured fireball code.   Restructured
  79  * some lighting code.   Made dynamic lighting on by default. Made groups
  80  * of lasers only cast one light.  Made fireballs not cast light.
  81  *
  82  * 3     1/15/98 11:13a John
  83  * Added code for specifying weapon trail bitmaps in weapons.tbl
  84  *
  85  * 2     12/21/97 6:15p John
  86  * Made a seperate system for missile trails
  87  *
  88  * 1     12/21/97 5:30p John
  89  * Initial version
  90  *
  91  * $NoKeywords: $
  92  */
  93
  94 #include "pstypes.h"
  95 #include "freespace.h"
  96 #include "weapon.h"
  97 #include "linklist.h"
  98 #include "3d.h"
  99 #include "3dinternal.h"
 100 #include "bmpman.h"
 101 #include "trails.h"
 102 #include "timer.h"
 103
 104 #define MAX_TRAILS MAX_WEAPONS
 105
 106 // Stuff for missile trails doesn't need to be saved or restored... or does it?
 107 typedef struct trail {
 108         int             head, tail;                                             // pointers into the queue for the trail points
 109         vector  pos[NUM_TRAIL_SECTIONS];        // positions of trail points
 110         float           val[NUM_TRAIL_SECTIONS];        // for each point, a value that tells how much to fade out
 111         int             object_died;                                    // set to zero as long as object
 112         int             trail_stamp;                                    // trail timestamp
 113
 114         // trail info
 115         trail_info info;                                                        // this is passed when creating a trail
 116
 117         struct  trail * prev;
 118         struct  trail * next;
 119 } trail;
 120
 121
 122 int Num_trails = 0;
 123 trail Trails[MAX_TRAILS];
 124
 125 trail Trail_free_list;
 126 trail Trail_used_list;
 127
 128 // Reset everything between levels
 129 void trail_level_init()
 130 {
 131         int i;
 132
 133         Num_trails = 0;
 134         list_init( &Trail_free_list );
 135         list_init( &Trail_used_list );
 136
 137         // Link all object slots into the free list
 138         for (i=0; i<MAX_TRAILS; i++)    {
 139                 list_append(&Trail_free_list, &Trails[i] );
 140         }
 141 }
 142
 143 //returns the number of a free trail
 144 //returns -1 if no free trails
 145 int trail_create(trail_info info)
 146 {
 147         int trail_num;
 148         trail *trailp;
 149
 150         // standalone server should never create trails
 151         if(Game_mode & GM_STANDALONE_SERVER){
 152                 return -1;
 153         }
 154
 155         if ( !Detail.weapon_extras )    {
 156                 // No trails at slot 0
 157                 return -1;
 158         }
 159
 160         if (Num_trails >= MAX_TRAILS ) {
 161                 #ifndef NDEBUG
 162                 mprintf(("Trail creation failed - too many trails!\n" ));
 163                 #endif
 164                 return -1;
 165         }
 166
 167         // Find next available trail
 168         trailp = GET_FIRST(&Trail_free_list);
 169         Assert( trailp != &Trail_free_list );           // shouldn't have the dummy element
 170
 171         // remove trailp from the free list
 172         list_remove( &Trail_free_list, trailp );
 173
 174         // insert trailp onto the end of used list
 175         list_append( &Trail_used_list, trailp );
 176
 177         // increment counter
 178         Num_trails++;
 179
 180         // get objnum
 181         trail_num = trailp-Trails;
 182
 183         // Init the trail data
 184         trailp->info = info;
 185         trailp->tail = 0;
 186         trailp->head = 0;
 187         trailp->object_died = 0;
 188         trailp->trail_stamp = timestamp(trailp->info.stamp);
 189
 190         return trail_num;
 191 }
 192
 193 // output top and bottom vectors
 194 // fvec == forward vector (eye viewpoint basically. in world coords)
 195 // pos == world coordinate of the point we're calculating "around"
 196 // w == width of the diff between top and bottom around pos
 197 void trail_calc_facing_pts( vector *top, vector *bot, vector *fvec, vector *pos, float w )
 198 {
 199         vector uvec, rvec;
 200
 201         vm_vec_sub( &rvec, &Eye_position, pos );
 202         vm_vec_normalize( &rvec );
 203
 204         vm_vec_crossprod(&uvec,fvec,&rvec);
 205         vm_vec_normalize(&uvec);
 206
 207         vm_vec_scale_add( top, pos, &uvec, w/2.0f );
 208         vm_vec_scale_add( bot, pos, &uvec, -w/2.0f );
 209 }
 210
 211 // trail is on ship
 212 int trail_is_on_ship(int trail_index, ship *shipp)
 213 {
 214         int idx;
 215
 216         for(idx=0; idx<MAX_SHIP_CONTRAILS; idx++){
 217                 if(shipp->trail_num[idx] == (short)trail_index){
 218                         return 1;
 219                 }
 220         }
 221
 222         // nope
 223         return 0;
 224 }
 225
 226 // Render the trail behind a missile.
 227 // Basically a queue of points that face the viewer.
 228 void trail_render( trail * trailp )
 229 {
 230         trail_info *ti;
 231
 232         if ( trailp->tail == trailp->head ) return;
 233
 234         ti = &trailp->info;
 235
 236         vector topv, botv, *fvec, last_pos, tmp_fvec;
 237         vertex last_top, last_bot, top, bot;
 238
 239         int sections[NUM_TRAIL_SECTIONS];
 240         int num_sections = 0;
 241
 242         int n = trailp->tail;
 243
 244         // if this trail is on the player ship, and he's in any padlock view except rear view, don't draw
 245         if((Player_ship != NULL) && trail_is_on_ship(trailp - Trails, Player_ship) && (Viewer_mode & (VM_PADLOCK_UP | VM_PADLOCK_LEFT | VM_PADLOCK_RIGHT)) ){
 246                 return;
 247         }
 248
 249         do      {
 250                 n--;
 251                 if ( n < 0 ) n = NUM_TRAIL_SECTIONS-1;
 252
 253
 254                 if ( trailp->val[n] > 1.0f ) {
 255                         break;
 256                 }
 257
 258                 sections[num_sections++] = n;
 259
 260         } while ( n != trailp->head );
 261
 262         int i;
 263
 264         for (i=0; i<num_sections; i++ ) {
 265
 266                 n = sections[i];
 267
 268                 float w;
 269                 ubyte l;
 270
 271                 w = trailp->val[n]*(ti->w_end - ti->w_start) + ti->w_start;
 272                 l = (ubyte)fl2i((trailp->val[n]*(ti->a_end - ti->a_start) + ti->a_start)*255.0f);
 273
 274                 vector pos;
 275
 276                 pos = trailp->pos[n];
 277
 278                 if ( i == 0 )   {
 279                         //fvec =
 280                         //&objp->orient.fvec;
 281                         if ( num_sections > 1 ) {
 282
 283                                 vm_vec_sub(&tmp_fvec, &pos, &trailp->pos[sections[i+1]] );
 284                                 vm_vec_normalize_safe(&tmp_fvec);
 285                                 fvec = &tmp_fvec;
 286
 287                         } else {
 288                                 fvec = &tmp_fvec;
 289                                 fvec->xyz.x = 0.0f;
 290                                 fvec->xyz.y = 0.0f;
 291                                 fvec->xyz.z = 1.0f;
 292                         }
 293                 } else {
 294                         vm_vec_sub(&tmp_fvec, &last_pos, &pos );
 295                         vm_vec_normalize_safe(&tmp_fvec);
 296                         fvec = &tmp_fvec;
 297                 }
 298
 299                 trail_calc_facing_pts( &topv, &botv, fvec, &pos, w );
 300
 301                 g3_rotate_vertex( &top, &topv );
 302                 g3_rotate_vertex( &bot, &botv );
 303                 top.a = bot.a = l;
 304
 305                 if ( i > 0 )    {
 306
 307                         if ( i == num_sections-1 )      {
 308                                 // Last one...
 309                                 vector centerv;
 310                                 vm_vec_avg( &centerv, &topv, &botv );
 311                                 vertex center;
 312                                 g3_rotate_vertex( &center, &centerv );
 313                                 center.a = l;
 314
 315                                 vertex *vlist[3];
 316                                 vlist[0] = &last_top;
 317                                 vlist[1] = &last_bot;
 318                                 vlist[2] = &center;
 319
 320                                 vlist[0]->u = 0.0f;  vlist[0]->v = 1.0f;
 321                                 vlist[1]->u = 0.0f;  vlist[1]->v = 0.0f;
 322                                 vlist[2]->u = 1.0f;  vlist[2]->v = 0.5f;
 323
 324                                 gr_set_bitmap(ti->bitmap, GR_ALPHABLEND_FILTER, GR_BITBLT_MODE_NORMAL, l/255.0f );
 325                                 if ( D3D_enabled )      {
 326                                         g3_draw_poly( 3, vlist, TMAP_FLAG_TEXTURED|TMAP_FLAG_ALPHA|TMAP_FLAG_GOURAUD );
 327                                 } else {
 328                                         g3_draw_poly( 3, vlist, TMAP_FLAG_TEXTURED );
 329                                 }
 330
 331
 332                         } else {
 333                                 vertex *vlist[4];
 334                                 vlist[0] = &last_bot;
 335                                 vlist[1] = &bot;
 336                                 vlist[2] = &top;
 337                                 vlist[3] = &last_top;
 338
 339                                 vlist[0]->u = 0.0f;  vlist[0]->v = 0.0f;
 340                                 vlist[1]->u = 1.0f;  vlist[1]->v = 0.0f;
 341                                 vlist[2]->u = 1.0f;  vlist[2]->v = 1.0f;
 342                                 vlist[3]->u = 0.0f;  vlist[3]->v = 1.0f;
 343
 344                                 gr_set_bitmap(ti->bitmap, GR_ALPHABLEND_FILTER, GR_BITBLT_MODE_NORMAL, l/255.0f );
 345                                 if ( D3D_enabled )      {
 346                                         g3_draw_poly( 4, vlist, TMAP_FLAG_TEXTURED|TMAP_FLAG_ALPHA|TMAP_FLAG_GOURAUD );
 347                                 } else {
 348                                         g3_draw_poly( 4, vlist, TMAP_FLAG_TEXTURED );
 349                                 }
 350                         }
 351                 }
 352                 last_pos = pos;
 353                 last_top = top;
 354                 last_bot = bot;
 355         }
 356 }
 357
 358
 359 void trail_add_segment( int trail_num, vector *pos )
 360 {
 361         if (trail_num < 0 ) return;
 362         if (trail_num >= MAX_TRAILS ) return;
 363
 364         trail *trailp = &Trails[trail_num];
 365
 366         int next = trailp->tail;
 367         trailp->tail++;
 368         if ( trailp->tail >= NUM_TRAIL_SECTIONS )
 369                 trailp->tail = 0;
 370
 371         if ( trailp->head == trailp->tail )     {
 372                 // wrapped!!
 373                 trailp->head++;
 374                 if ( trailp->head >= NUM_TRAIL_SECTIONS )
 375                         trailp->head = 0;
 376         }
 377
 378         trailp->pos[next] = *pos;
 379         trailp->val[next] = 0.0f;
 380 }
 381
 382 void trail_set_segment( int trail_num, vector *pos )
 383 {
 384         if (trail_num < 0 ) return;
 385         if (trail_num >= MAX_TRAILS ) return;
 386
 387         trail *trailp = &Trails[trail_num];
 388
 389         int next = trailp->tail-1;
 390         if ( next < 0 ) {
 391                 next = NUM_TRAIL_SECTIONS-1;
 392         }
 393
 394         trailp->pos[next] = *pos;
 395 }
 396
 397 void trail_move_all(float frametime)
 398 {
 399         trail *trailp;
 400
 401         trailp=GET_FIRST(&Trail_used_list);
 402
 403         while ( trailp!=END_OF_LIST(&Trail_used_list) ) {
 404
 405                 int num_alive_segments = 0;
 406
 407                 if ( trailp->tail != trailp->head )     {
 408                         int n = trailp->tail;
 409                         float time_delta = frametime / trailp->info.max_life;
 410                         do      {
 411                                 n--;
 412                                 if ( n < 0 ) n = NUM_TRAIL_SECTIONS-1;
 413
 414                                 trailp->val[n] += time_delta;
 415
 416                                 if ( trailp->val[n] <= 1.0f ) {
 417                                         num_alive_segments++;   // Record how many still alive.
 418                                 }
 419
 420                         } while ( n != trailp->head );
 421                 }
 422
 423                 if ( trailp->object_died && (num_alive_segments < 1) )  {
 424                         // delete it from the list!
 425                         trail *next_one = GET_NEXT(trailp);
 426
 427                         // remove objp from the used list
 428                         list_remove( &Trail_used_list, trailp);
 429
 430                         // add objp to the end of the free
 431                         list_append( &Trail_free_list, trailp );
 432
 433                         // decrement counter
 434                         Num_trails--;
 435
 436                         Assert(Num_trails >= 0);
 437
 438                         trailp = next_one;
 439                 } else {
 440                         trailp=GET_NEXT(trailp);
 441                 }
 442         }
 443 }
 444
 445 void trail_object_died( int trail_num )
 446 {
 447         if (trail_num < 0 ) return;
 448         if (trail_num >= MAX_TRAILS ) return;
 449
 450         trail *trailp = &Trails[trail_num];
 451
 452         trailp->object_died++;
 453 }
 454
 455 void trail_render_all()
 456 {
 457         trail *trailp;
 458
 459         if ( !Detail.weapon_extras )    {
 460                 // No trails at slot 0
 461                 return;
 462         }
 463
 464         trailp=GET_FIRST(&Trail_used_list);
 465
 466         while ( trailp!=END_OF_LIST(&Trail_used_list) ) {
 467                 trail_render(trailp);
 468                 trailp=GET_NEXT(trailp);
 469         }
 470
 471 }
 472 int trail_stamp_elapsed(int trail_num)
 473 {
 474         return timestamp_elapsed(Trails[trail_num].trail_stamp);
 475 }
 476
 477 void trail_set_stamp(int trail_num)
 478 {
 479         Trails[trail_num].trail_stamp = timestamp(Trails[trail_num].info.stamp);
 480 }