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