r_explosion.c

   1 /*
   2 Copyright (C) 1996-1997 Id Software, Inc.
   3
   4 This program is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU General Public License
   6 as published by the Free Software Foundation; either version 2
   7 of the License, or (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  12
  13 See the GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18
  19 */
  20
  21 #include "quakedef.h"
  22 #include "cl_collision.h"
  23
  24 #define MAX_EXPLOSIONS 64
  25 #define EXPLOSIONGRID 8
  26 #define EXPLOSIONVERTS ((EXPLOSIONGRID+1)*(EXPLOSIONGRID+1))
  27 #define EXPLOSIONTRIS (EXPLOSIONGRID*EXPLOSIONGRID*2)
  28 #define EXPLOSIONSTARTVELOCITY (256.0f)
  29 //#define EXPLOSIONSTARTVELOCITY (384.0f)
  30 //#define EXPLOSIONRANDOMVELOCITY (32.0f)
  31 #define EXPLOSIONFADESTART (1.5f)
  32 //#define EXPLOSIONFADERATE (4.5f)
  33 #define EXPLOSIONFADERATE (3.0f)
  34 /*
  35 #define MAX_EXPLOSIONGAS (MAX_EXPLOSIONS * EXPLOSIONGAS)
  36 #define EXPLOSIONGAS 8
  37 #define EXPLOSIONGASSTARTRADIUS (15.0f)
  38 #define EXPLOSIONGASSTARTVELOCITY (50.0f)
  39 #define GASDENSITY_SCALER (32768.0f / EXPLOSIONGAS)
  40 #define GASFADERATE (GASDENSITY_SCALER * EXPLOSIONGAS * 2)
  41
  42 typedef struct explosiongas_s
  43 {
  44         float pressure;
  45         vec3_t origin;
  46         vec3_t velocity;
  47 }
  48 explosiongas_t;
  49
  50 explosiongas_t explosiongas[MAX_EXPLOSIONGAS];
  51 */
  52
  53 float explosiontexcoords[EXPLOSIONVERTS][2];
  54 int explosiontris[EXPLOSIONTRIS][3];
  55 int explosionnoiseindex[EXPLOSIONVERTS];
  56 vec3_t explosionpoint[EXPLOSIONVERTS];
  57 vec3_t explosionspherevertvel[EXPLOSIONVERTS];
  58
  59 typedef struct explosion_s
  60 {
  61         float starttime;
  62         float time;
  63         float alpha;
  64         vec3_t origin;
  65         vec3_t vert[EXPLOSIONVERTS];
  66         vec3_t vertvel[EXPLOSIONVERTS];
  67 }
  68 explosion_t;
  69
  70 explosion_t explosion[MAX_EXPLOSIONS];
  71
  72 rtexture_t      *explosiontexture;
  73 rtexture_t      *explosiontexturefog;
  74
  75 rtexturepool_t  *explosiontexturepool;
  76
  77 cvar_t r_explosionclip = {CVAR_SAVE, "r_explosionclip", "1"};
  78 cvar_t r_drawexplosions = {0, "r_drawexplosions", "1"};
  79
  80 void r_explosion_start(void)
  81 {
  82         int x, y;
  83         qbyte noise1[128][128], noise2[128][128], noise3[128][128], data[128][128][4];
  84         explosiontexturepool = R_AllocTexturePool();
  85         fractalnoise(&noise1[0][0], 128, 32);
  86         fractalnoise(&noise2[0][0], 128, 4);
  87         fractalnoise(&noise3[0][0], 128, 4);
  88         for (y = 0;y < 128;y++)
  89         {
  90                 for (x = 0;x < 128;x++)
  91                 {
  92                         int j, r, g, b, a;
  93                         j = (noise1[y][x] * noise2[y][x]) * 3 / 256 - 128;
  94                         r = (j * 512) / 256;
  95                         g = (j * 256) / 256;
  96                         b = (j * 128) / 256;
  97                         a = noise3[y][x] * 3 - 128;
  98                         data[y][x][0] = bound(0, r, 255);
  99                         data[y][x][1] = bound(0, g, 255);
 100                         data[y][x][2] = bound(0, b, 255);
 101                         data[y][x][3] = bound(0, a, 255);
 102                 }
 103         }
 104         explosiontexture = R_LoadTexture (explosiontexturepool, "explosiontexture", 128, 128, &data[0][0][0], TEXTYPE_RGBA, TEXF_MIPMAP | TEXF_ALPHA | TEXF_PRECACHE);
 105         for (y = 0;y < 128;y++)
 106                 for (x = 0;x < 128;x++)
 107                         data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
 108         explosiontexturefog = R_LoadTexture (explosiontexturepool, "explosiontexturefog", 128, 128, &data[0][0][0], TEXTYPE_RGBA, TEXF_MIPMAP | TEXF_ALPHA | TEXF_PRECACHE);
 109         // note that explosions survive the restart
 110 }
 111
 112 void r_explosion_shutdown(void)
 113 {
 114         R_FreeTexturePool(&explosiontexturepool);
 115 }
 116
 117 void r_explosion_newmap(void)
 118 {
 119         memset(explosion, 0, sizeof(explosion));
 120 //      memset(explosiongas, 0, sizeof(explosiongas));
 121 }
 122
 123 int R_ExplosionVert(int column, int row)
 124 {
 125         int i;
 126         float a, b, c;
 127         i = row * (EXPLOSIONGRID + 1) + column;
 128         a = row * M_PI * 2 / EXPLOSIONGRID;
 129         b = column * M_PI * 2 / EXPLOSIONGRID;
 130         c = cos(b);
 131         explosionpoint[i][0] = cos(a) * c;
 132         explosionpoint[i][1] = sin(a) * c;
 133         explosionpoint[i][2] = -sin(b);
 134         explosionspherevertvel[i][0] = explosionpoint[i][0] * EXPLOSIONSTARTVELOCITY;
 135         explosionspherevertvel[i][1] = explosionpoint[i][1] * EXPLOSIONSTARTVELOCITY;
 136         explosionspherevertvel[i][2] = explosionpoint[i][2] * EXPLOSIONSTARTVELOCITY;
 137         explosiontexcoords[i][0] = (float) column / (float) EXPLOSIONGRID;
 138         explosiontexcoords[i][1] = (float) row / (float) EXPLOSIONGRID;
 139         // top and bottom rows are all one position...
 140         if (row == 0 || row == EXPLOSIONGRID)
 141                 column = 0;
 142         explosionnoiseindex[i] = (row % EXPLOSIONGRID) * EXPLOSIONGRID + (column % EXPLOSIONGRID);
 143         return i;
 144 }
 145
 146 void R_Explosion_Init(void)
 147 {
 148         int i, x, y;
 149         i = 0;
 150         for (y = 0;y < EXPLOSIONGRID;y++)
 151         {
 152                 for (x = 0;x < EXPLOSIONGRID;x++)
 153                 {
 154                         explosiontris[i][0] = R_ExplosionVert(x    , y    );
 155                         explosiontris[i][1] = R_ExplosionVert(x + 1, y    );
 156                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 157                         i++;
 158                         explosiontris[i][0] = R_ExplosionVert(x + 1, y    );
 159                         explosiontris[i][1] = R_ExplosionVert(x + 1, y + 1);
 160                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 161                         i++;
 162                 }
 163         }
 164
 165         Cvar_RegisterVariable(&r_explosionclip);
 166         Cvar_RegisterVariable(&r_drawexplosions);
 167
 168         R_RegisterModule("R_Explosions", r_explosion_start, r_explosion_shutdown, r_explosion_newmap);
 169 }
 170
 171 void R_NewExplosion(vec3_t org)
 172 {
 173         int i, j;
 174         float dist;
 175         qbyte noise[EXPLOSIONGRID*EXPLOSIONGRID];
 176         fractalnoisequick(noise, EXPLOSIONGRID, 4); // adjust noise grid size according to explosion
 177         for (i = 0;i < MAX_EXPLOSIONS;i++)
 178         {
 179                 if (explosion[i].alpha <= 0.01f)
 180                 {
 181                         explosion[i].starttime = cl.time;
 182                         explosion[i].time = explosion[i].starttime - 0.1;
 183                         explosion[i].alpha = EXPLOSIONFADESTART;
 184                         VectorCopy(org, explosion[i].origin);
 185                         for (j = 0;j < EXPLOSIONVERTS;j++)
 186                         {
 187                                 // calculate start
 188                                 VectorCopy(explosion[i].origin, explosion[i].vert[j]);
 189                                 // calculate velocity
 190                                 dist = noise[explosionnoiseindex[j]] * (1.0f / 255.0f) + 0.5;
 191                                 VectorScale(explosionspherevertvel[j], dist, explosion[i].vertvel[j]);
 192                                 //explosion[i].vertvel[j][0] = explosionspherevertvel[j][0] * dist; + (((float) noise[0][explosionnoiseindex[j]] - 128.0f) * (EXPLOSIONRANDOMVELOCITY / 128.0f));
 193                                 //explosion[i].vertvel[j][1] = explosionspherevertvel[j][1] * dist; + (((float) noise[1][explosionnoiseindex[j]] - 128.0f) * (EXPLOSIONRANDOMVELOCITY / 128.0f));
 194                                 //explosion[i].vertvel[j][2] = explosionspherevertvel[j][2] * dist; + (((float) noise[2][explosionnoiseindex[j]] - 128.0f) * (EXPLOSIONRANDOMVELOCITY / 128.0f));
 195                         }
 196                         break;
 197                 }
 198         }
 199
 200         /*
 201         i = 0;
 202         j = EXPLOSIONGAS;
 203         while (i < MAX_EXPLOSIONGAS && j > 0)
 204         {
 205                 while (explosiongas[i].pressure > 0)
 206                 {
 207                         i++;
 208                         if (i >= MAX_EXPLOSIONGAS)
 209                                 return;
 210                 }
 211                 VectorRandom(v);
 212                 VectorMA(org, EXPLOSIONGASSTARTRADIUS, v, v);
 213                 TraceLine(org, v, explosiongas[i].origin, NULL, 0, true);
 214                 VectorRandom(v);
 215                 VectorScale(v, EXPLOSIONGASSTARTVELOCITY, explosiongas[i].velocity);
 216                 explosiongas[i].pressure = j * GASDENSITY_SCALER;
 217                 j--;
 218         }
 219         */
 220 }
 221
 222 void R_DrawExplosion(explosion_t *e)
 223 {
 224         int i;
 225         float c[EXPLOSIONVERTS][4], diff[3], centerdir[3], /*fog, */ifog, alpha, dist/*, centerdist, size, scale*/;
 226         rmeshinfo_t m;
 227         memset(&m, 0, sizeof(m));
 228         m.transparent = true;
 229         m.blendfunc1 = GL_SRC_ALPHA;
 230         m.blendfunc2 = GL_ONE; //_MINUS_SRC_ALPHA;
 231         m.numtriangles = EXPLOSIONTRIS;
 232         m.index = &explosiontris[0][0];
 233         m.numverts = EXPLOSIONVERTS;
 234         m.vertex = &e->vert[0][0];
 235         m.vertexstep = sizeof(float[3]);
 236         alpha = e->alpha;
 237         //if (alpha > 1)
 238         //      alpha = 1;
 239         m.cr = 1;
 240         m.cg = 1;
 241         m.cb = 1;
 242         m.ca = 1; //alpha;
 243         m.color = &c[0][0];
 244         m.colorstep = sizeof(float[4]);
 245         VectorSubtract(r_origin, e->origin, centerdir);
 246         VectorNormalizeFast(centerdir);
 247         /*
 248         centerdist = DotProduct(e->origin, centerdir);
 249         size = 0;
 250         for (i = 0;i < EXPLOSIONVERTS;i++)
 251         {
 252                 dist = DotProduct(e->vert[i], centerdir) - centerdist;
 253                 if (size < dist)
 254                         size = dist;
 255         }
 256         scale = 4.0f / size;
 257         */
 258         if (fogenabled)
 259         {
 260                 for (i = 0;i < EXPLOSIONVERTS;i++)
 261                 {
 262                         //dist = (DotProduct(e->vert[i], centerdir) - centerdist) * scale - 2.0f;
 263                         VectorSubtract(e->vert[i], e->origin, diff);
 264                         VectorNormalizeFast(diff);
 265                         dist = (DotProduct(diff, centerdir) * 6.0f - 4.0f) * alpha;
 266                         if (dist > 0)
 267                         {
 268                                 // use inverse fog alpha
 269                                 VectorSubtract(e->vert[i], r_origin, diff);
 270                                 ifog = 1 - exp(fogdensity/DotProduct(diff,diff));
 271                                 dist = dist * ifog;
 272                                 if (dist < 0)
 273                                         dist = 0;
 274                         }
 275                         else
 276                                 dist = 0;
 277                         c[i][0] = c[i][1] = c[i][2] = dist;
 278                         c[i][3] = 1;
 279                 }
 280         }
 281         else
 282         {
 283                 for (i = 0;i < EXPLOSIONVERTS;i++)
 284                 {
 285                         //dist = (DotProduct(e->vert[i], centerdir) - centerdist) * scale - 2.0f;
 286                         VectorSubtract(e->vert[i], e->origin, diff);
 287                         VectorNormalizeFast(diff);
 288                         dist = (DotProduct(diff, centerdir) * 6.0f - 4.0f) * alpha;
 289                         if (dist < 0)
 290                                 dist = 0;
 291                         c[i][0] = c[i][1] = c[i][2] = dist;
 292                         c[i][3] = 1;
 293                 }
 294         }
 295         /*
 296         if (fogenabled)
 297         {
 298                 m.color = &c[0][0];
 299                 m.colorstep = sizeof(float[4]);
 300                 for (i = 0;i < EXPLOSIONVERTS;i++)
 301                 {
 302                         // use inverse fog alpha as color
 303                         VectorSubtract(e->vert[i], r_origin, diff);
 304                         ifog = 1 - exp(fogdensity/DotProduct(diff,diff));
 305                         if (ifog < 0)
 306                                 ifog = 0;
 307                         c[i][0] = ifog;
 308                         c[i][1] = ifog;
 309                         c[i][2] = ifog;
 310                         c[i][3] = alpha;
 311                 }
 312         }
 313         */
 314         m.tex[0] = R_GetTexture(explosiontexture);
 315         m.texcoords[0] = &explosiontexcoords[0][0];
 316         m.texcoordstep[0] = sizeof(float[2]);
 317
 318         R_Mesh_Draw(&m);
 319
 320         /*
 321         if (fogenabled)
 322         {
 323                 m.blendfunc1 = GL_SRC_ALPHA;
 324                 m.blendfunc2 = GL_ONE;
 325                 for (i = 0;i < EXPLOSIONVERTS;i++)
 326                 {
 327                         VectorSubtract(e->vert[i], r_origin, diff);
 328                         fog = exp(fogdensity/DotProduct(diff,diff));
 329                         c[i][0] = fogcolor[0];
 330                         c[i][1] = fogcolor[1];
 331                         c[i][2] = fogcolor[2];
 332                         c[i][3] = alpha * fog;
 333                 }
 334                 //m.color = &c[0][0];
 335                 //m.colorstep = sizeof(float[4]);
 336                 m.tex[0] = R_GetTexture(explosiontexturefog);
 337                 R_Mesh_Draw(&m);
 338         }
 339         */
 340 }
 341
 342 void R_MoveExplosion(explosion_t *e/*, explosiongas_t **list, explosiongas_t **listend, */)
 343 {
 344         int i;
 345         float dot, frictionscale, end[3], impact[3], normal[3], frametime;
 346         /*
 347         vec3_t diff;
 348         vec_t dist;
 349         explosiongas_t **l;
 350         */
 351         frametime = cl.time - e->time;
 352         e->time = cl.time;
 353         e->alpha = EXPLOSIONFADESTART - (cl.time - e->starttime) * EXPLOSIONFADERATE;
 354         if (e->alpha <= 0.01f)
 355         {
 356                 e->alpha = -1;
 357                 return;
 358         }
 359         frictionscale = 1 - frametime;
 360         frictionscale = bound(0, frictionscale, 1);
 361         for (i = 0;i < EXPLOSIONVERTS;i++)
 362         {
 363                 if (e->vertvel[i][0] || e->vertvel[i][1] || e->vertvel[i][2])
 364                 {
 365                         //e->vertvel[i][2] += sv_gravity.value * frametime * -0.25f;
 366                         VectorScale(e->vertvel[i], frictionscale, e->vertvel[i]);
 367                         VectorMA(e->vert[i], frametime, e->vertvel[i], end);
 368                         if (r_explosionclip.integer)
 369                         {
 370                                 if (CL_TraceLine(e->vert[i], end, impact, normal, 0, true) < 1)
 371                                 {
 372                                         // clip velocity against the wall
 373                                         dot = DotProduct(e->vertvel[i], normal) * -1.125f;
 374                                         VectorMA(e->vertvel[i], dot, normal, e->vertvel[i]);
 375                                 }
 376                                 VectorCopy(impact, e->vert[i]);
 377                         }
 378                         else
 379                                 VectorCopy(end, e->vert[i]);
 380                 }
 381                 /*
 382                 for (l = list;l < listend;l++)
 383                 {
 384                         VectorSubtract(e->vert[i], (*l)->origin, diff);
 385                         dist = DotProduct(diff, diff);
 386                         if (dist < 4096 && dist >= 1)
 387                         {
 388                                 dist = (*l)->pressure * frametime / dist;
 389                                 VectorMA(e->vertvel[i], dist, diff, e->vertvel[i]);
 390                         }
 391                 }
 392                 */
 393         }
 394         for (i = 0;i < EXPLOSIONGRID;i++)
 395                 VectorCopy(e->vert[i * (EXPLOSIONGRID + 1)], e->vert[i * (EXPLOSIONGRID + 1) + EXPLOSIONGRID]);
 396         memcpy(e->vert[EXPLOSIONGRID * (EXPLOSIONGRID + 1)], e->vert[0], sizeof(float[3]) * (EXPLOSIONGRID + 1));
 397 }
 398
 399 /*
 400 void R_MoveExplosionGas(explosiongas_t *e, explosiongas_t **list, explosiongas_t **listend, float frametime)
 401 {
 402         vec3_t end, diff;
 403         vec_t dist, frictionscale;
 404         explosiongas_t **l;
 405         frictionscale = 1 - frametime;
 406         frictionscale = bound(0, frictionscale, 1);
 407         if (e->velocity[0] || e->velocity[1] || e->velocity[2])
 408         {
 409                 end[0] = e->origin[0] + frametime * e->velocity[0];
 410                 end[1] = e->origin[1] + frametime * e->velocity[1];
 411                 end[2] = e->origin[2] + frametime * e->velocity[2];
 412                 if (r_explosionclip.integer)
 413                 {
 414                         float f, dot;
 415                         vec3_t impact, normal;
 416                         f = TraceLine(e->origin, end, impact, normal, 0, true);
 417                         VectorCopy(impact, e->origin);
 418                         if (f < 1)
 419                         {
 420                                 // clip velocity against the wall
 421                                 dot = DotProduct(e->velocity, normal) * -1.3f;
 422                                 e->velocity[0] += normal[0] * dot;
 423                                 e->velocity[1] += normal[1] * dot;
 424                                 e->velocity[2] += normal[2] * dot;
 425                         }
 426                 }
 427                 else
 428                 {
 429                         VectorCopy(end, e->origin);
 430                 }
 431                 e->velocity[2] += sv_gravity.value * frametime;
 432                 VectorScale(e->velocity, frictionscale, e->velocity);
 433         }
 434         for (l = list;l < listend;l++)
 435         {
 436                 if (*l != e)
 437                 {
 438                         VectorSubtract(e->origin, (*l)->origin, diff);
 439                         dist = DotProduct(diff, diff);
 440                         if (dist < 4096 && dist >= 1)
 441                         {
 442                                 dist = (*l)->pressure * frametime / dist;
 443                                 VectorMA(e->velocity, dist, diff, e->velocity);
 444                         }
 445                 }
 446         }
 447 }
 448 */
 449
 450 void R_MoveExplosions(void)
 451 {
 452         int i;
 453         float frametime;
 454 //      explosiongas_t *gaslist[MAX_EXPLOSIONGAS], **l, **end;
 455         frametime = cl.time - cl.oldtime;
 456         /*
 457         l = &gaslist[0];
 458         for (i = 0;i < MAX_EXPLOSIONGAS;i++)
 459         {
 460                 if (explosiongas[i].pressure > 0)
 461                 {
 462                         explosiongas[i].pressure -= frametime * GASFADERATE;
 463                         if (explosiongas[i].pressure > 0)
 464                                 *l++ = &explosiongas[i];
 465                 }
 466         }
 467         end = l;
 468         for (l = gaslist;l < end;l++)
 469                 R_MoveExplosionGas(*l, gaslist, end, frametime);
 470         */
 471
 472         for (i = 0;i < MAX_EXPLOSIONS;i++)
 473                 if (explosion[i].alpha > 0.01f)
 474                         R_MoveExplosion(&explosion[i]/*, gaslist, end, */);
 475 }
 476
 477 void R_DrawExplosions(void)
 478 {
 479         int i;
 480         if (!r_drawexplosions.integer)
 481                 return;
 482         for (i = 0;i < MAX_EXPLOSIONS;i++)
 483                 if (explosion[i].alpha > 0.01f)
 484                         R_DrawExplosion(&explosion[i]);
 485 }