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 (384.0f)
  28 //#define EXPLOSIONRANDOMVELOCITY (32.0f)
  29 #define EXPLOSIONFADESTART (1.5f)
  30 #define EXPLOSIONFADERATE (4.5f)
  31 /*
  32 #define MAX_EXPLOSIONGAS (MAX_EXPLOSIONS * EXPLOSIONGAS)
  33 #define EXPLOSIONGAS 8
  34 #define EXPLOSIONGASSTARTRADIUS (15.0f)
  35 #define EXPLOSIONGASSTARTVELOCITY (50.0f)
  36 #define GASDENSITY_SCALER (32768.0f / EXPLOSIONGAS)
  37 #define GASFADERATE (GASDENSITY_SCALER * EXPLOSIONGAS * 2)
  38
  39 typedef struct explosiongas_s
  40 {
  41         float pressure;
  42         vec3_t origin;
  43         vec3_t velocity;
  44 }
  45 explosiongas_t;
  46
  47 explosiongas_t explosiongas[MAX_EXPLOSIONGAS];
  48 */
  49
  50 float explosiontexcoords[EXPLOSIONVERTS][2];
  51 int explosiontris[EXPLOSIONTRIS][3];
  52 int explosionnoiseindex[EXPLOSIONVERTS];
  53 vec3_t explosionpoint[EXPLOSIONVERTS];
  54 vec3_t explosionspherevertvel[EXPLOSIONVERTS];
  55
  56 typedef struct explosion_s
  57 {
  58         float starttime;
  59         float time;
  60         float alpha;
  61         vec3_t origin;
  62         vec3_t vert[EXPLOSIONVERTS];
  63         vec3_t vertvel[EXPLOSIONVERTS];
  64 }
  65 explosion_t;
  66
  67 explosion_t explosion[MAX_EXPLOSIONS];
  68
  69 rtexture_t      *explosiontexture;
  70 rtexture_t      *explosiontexturefog;
  71
  72 rtexturepool_t  *explosiontexturepool;
  73
  74 cvar_t r_explosionclip = {CVAR_SAVE, "r_explosionclip", "1"};
  75 cvar_t r_drawexplosions = {0, "r_drawexplosions", "1"};
  76
  77 void r_explosion_start(void)
  78 {
  79         int x, y;
  80         byte noise1[128][128], noise2[128][128], noise3[128][128], data[128][128][4];
  81         explosiontexturepool = R_AllocTexturePool();
  82         fractalnoise(&noise1[0][0], 128, 32);
  83         fractalnoise(&noise2[0][0], 128, 4);
  84         fractalnoise(&noise3[0][0], 128, 4);
  85         for (y = 0;y < 128;y++)
  86         {
  87                 for (x = 0;x < 128;x++)
  88                 {
  89                         int j, r, g, b, a;
  90                         j = (noise1[y][x] * noise2[y][x]) * 3 / 256 - 128;
  91                         r = (j * 512) / 256;
  92                         g = (j * 256) / 256;
  93                         b = (j * 128) / 256;
  94                         a = noise3[y][x] * 3 - 128;
  95                         data[y][x][0] = bound(0, r, 255);
  96                         data[y][x][1] = bound(0, g, 255);
  97                         data[y][x][2] = bound(0, b, 255);
  98                         data[y][x][3] = bound(0, a, 255);
  99                 }
 100         }
 101         explosiontexture = R_LoadTexture (explosiontexturepool, "explosiontexture", 128, 128, &data[0][0][0], TEXTYPE_RGBA, TEXF_MIPMAP | TEXF_ALPHA | TEXF_PRECACHE);
 102         for (y = 0;y < 128;y++)
 103                 for (x = 0;x < 128;x++)
 104                         data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
 105         explosiontexturefog = R_LoadTexture (explosiontexturepool, "explosiontexturefog", 128, 128, &data[0][0][0], TEXTYPE_RGBA, TEXF_MIPMAP | TEXF_ALPHA | TEXF_PRECACHE);
 106         // note that explosions survive the restart
 107 }
 108
 109 void r_explosion_shutdown(void)
 110 {
 111         R_FreeTexturePool(&explosiontexturepool);
 112 }
 113
 114 void r_explosion_newmap(void)
 115 {
 116         memset(explosion, 0, sizeof(explosion));
 117 //      memset(explosiongas, 0, sizeof(explosiongas));
 118 }
 119
 120 int R_ExplosionVert(int column, int row)
 121 {
 122         int i;
 123         float a, b, c;
 124         i = row * (EXPLOSIONGRID + 1) + column;
 125         a = row * M_PI * 2 / EXPLOSIONGRID;
 126         b = column * M_PI * 2 / EXPLOSIONGRID;
 127         c = cos(b);
 128         explosionpoint[i][0] = cos(a) * c;
 129         explosionpoint[i][1] = sin(a) * c;
 130         explosionpoint[i][2] = -sin(b);
 131         explosionspherevertvel[i][0] = explosionpoint[i][0] * EXPLOSIONSTARTVELOCITY;
 132         explosionspherevertvel[i][1] = explosionpoint[i][1] * EXPLOSIONSTARTVELOCITY;
 133         explosionspherevertvel[i][2] = explosionpoint[i][2] * EXPLOSIONSTARTVELOCITY;
 134         explosiontexcoords[i][0] = (float) column / (float) EXPLOSIONGRID;
 135         explosiontexcoords[i][1] = (float) row / (float) EXPLOSIONGRID;
 136         // top and bottom rows are all one position...
 137         if (row == 0 || row == EXPLOSIONGRID)
 138                 column = 0;
 139         explosionnoiseindex[i] = (row % EXPLOSIONGRID) * EXPLOSIONGRID + (column % EXPLOSIONGRID);
 140         return i;
 141 }
 142
 143 void R_Explosion_Init(void)
 144 {
 145         int i, x, y;
 146         i = 0;
 147         for (y = 0;y < EXPLOSIONGRID;y++)
 148         {
 149                 for (x = 0;x < EXPLOSIONGRID;x++)
 150                 {
 151                         explosiontris[i][0] = R_ExplosionVert(x    , y    );
 152                         explosiontris[i][1] = R_ExplosionVert(x + 1, y    );
 153                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 154                         i++;
 155                         explosiontris[i][0] = R_ExplosionVert(x + 1, y    );
 156                         explosiontris[i][1] = R_ExplosionVert(x + 1, y + 1);
 157                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 158                         i++;
 159                 }
 160         }
 161
 162         Cvar_RegisterVariable(&r_explosionclip);
 163         Cvar_RegisterVariable(&r_drawexplosions);
 164
 165         R_RegisterModule("R_Explosions", r_explosion_start, r_explosion_shutdown, r_explosion_newmap);
 166 }
 167
 168 void R_NewExplosion(vec3_t org)
 169 {
 170         int i, j;
 171         float dist;
 172         byte noise[EXPLOSIONGRID*EXPLOSIONGRID];
 173         fractalnoisequick(noise, EXPLOSIONGRID, 4);
 174         for (i = 0;i < MAX_EXPLOSIONS;i++)
 175         {
 176                 if (explosion[i].alpha <= 0.0f)
 177                 {
 178                         explosion[i].starttime = cl.time;
 179                         explosion[i].time = explosion[i].starttime - 0.1;
 180                         explosion[i].alpha = EXPLOSIONFADESTART;
 181                         VectorCopy(org, explosion[i].origin);
 182                         for (j = 0;j < EXPLOSIONVERTS;j++)
 183                         {
 184                                 // calculate start
 185                                 VectorCopy(explosion[i].origin, explosion[i].vert[j]);
 186                                 // calculate velocity
 187                                 dist = noise[explosionnoiseindex[j]] * (1.0f / 255.0f) + 0.5;
 188                                 VectorScale(explosionspherevertvel[j], dist, explosion[i].vertvel[j]);
 189                                 //explosion[i].vertvel[j][0] = explosionspherevertvel[j][0] * dist; + (((float) noise[0][explosionnoiseindex[j]] - 128.0f) * (EXPLOSIONRANDOMVELOCITY / 128.0f));
 190                                 //explosion[i].vertvel[j][1] = explosionspherevertvel[j][1] * dist; + (((float) noise[1][explosionnoiseindex[j]] - 128.0f) * (EXPLOSIONRANDOMVELOCITY / 128.0f));
 191                                 //explosion[i].vertvel[j][2] = explosionspherevertvel[j][2] * dist; + (((float) noise[2][explosionnoiseindex[j]] - 128.0f) * (EXPLOSIONRANDOMVELOCITY / 128.0f));
 192                         }
 193                         break;
 194                 }
 195         }
 196
 197         /*
 198         i = 0;
 199         j = EXPLOSIONGAS;
 200         while (i < MAX_EXPLOSIONGAS && j > 0)
 201         {
 202                 while (explosiongas[i].pressure > 0)
 203                 {
 204                         i++;
 205                         if (i >= MAX_EXPLOSIONGAS)
 206                                 return;
 207                 }
 208                 VectorRandom(v);
 209                 VectorMA(org, EXPLOSIONGASSTARTRADIUS, v, v);
 210                 TraceLine(org, v, explosiongas[i].origin, NULL, 0, true);
 211                 VectorRandom(v);
 212                 VectorScale(v, EXPLOSIONGASSTARTVELOCITY, explosiongas[i].velocity);
 213                 explosiongas[i].pressure = j * GASDENSITY_SCALER;
 214                 j--;
 215         }
 216         */
 217 }
 218
 219 void R_DrawExplosion(explosion_t *e)
 220 {
 221         int i;
 222         float c[EXPLOSIONVERTS][4], diff[3], /*fog, */ifog, alpha, dist, centerdist, size, scale;
 223         rmeshinfo_t m;
 224         memset(&m, 0, sizeof(m));
 225         m.transparent = true;
 226         m.blendfunc1 = GL_SRC_ALPHA;
 227         m.blendfunc2 = GL_ONE; //_MINUS_SRC_ALPHA;
 228         m.numtriangles = EXPLOSIONTRIS;
 229         m.index = &explosiontris[0][0];
 230         m.numverts = EXPLOSIONVERTS;
 231         m.vertex = &e->vert[0][0];
 232         m.vertexstep = sizeof(float[3]);
 233         alpha = e->alpha;
 234         if (alpha > 1)
 235                 alpha = 1;
 236         m.cr = 1;
 237         m.cg = 1;
 238         m.cb = 1;
 239         m.ca = alpha;
 240         m.color = &c[0][0];
 241         m.colorstep = sizeof(float[4]);
 242         centerdist = DotProduct(e->origin, vpn);
 243         size = 0;
 244         for (i = 0;i < EXPLOSIONVERTS;i++)
 245         {
 246                 dist = DotProduct(e->vert[i], vpn) - centerdist;
 247                 if (size > dist)
 248                         size = dist;
 249         }
 250         scale = 1.0f / size;
 251         if (fogenabled)
 252         {
 253                 for (i = 0;i < EXPLOSIONVERTS;i++)
 254                 {
 255                         dist = (DotProduct(e->vert[i], vpn) - centerdist) * scale;
 256                         if (dist > 0)
 257                         {
 258                                 // use inverse fog alpha as color
 259                                 VectorSubtract(e->vert[i], r_origin, diff);
 260                                 ifog = 1 - exp(fogdensity/DotProduct(diff,diff));
 261                                 if (ifog < 0)
 262                                         ifog = 0;
 263                                 c[i][0] = c[i][1] = c[i][2] = dist * alpha * ifog;
 264                         }
 265                         else
 266                                 c[i][0] = c[i][1] = c[i][2] = 0;
 267                         c[i][3] = 1;
 268                 }
 269         }
 270         else
 271         {
 272                 for (i = 0;i < EXPLOSIONVERTS;i++)
 273                 {
 274                         dist = (DotProduct(e->vert[i], vpn) - centerdist) * scale;
 275                         if (dist > 0)
 276                                 c[i][0] = c[i][1] = c[i][2] = dist * alpha;
 277                         else
 278                                 c[i][0] = c[i][1] = c[i][2] = 0;
 279                         c[i][3] = 1;
 280                 }
 281         }
 282         /*
 283         if (fogenabled)
 284         {
 285                 m.color = &c[0][0];
 286                 m.colorstep = sizeof(float[4]);
 287                 for (i = 0;i < EXPLOSIONVERTS;i++)
 288                 {
 289                         // use inverse fog alpha as color
 290                         VectorSubtract(e->vert[i], r_origin, diff);
 291                         ifog = 1 - exp(fogdensity/DotProduct(diff,diff));
 292                         if (ifog < 0)
 293                                 ifog = 0;
 294                         c[i][0] = ifog;
 295                         c[i][1] = ifog;
 296                         c[i][2] = ifog;
 297                         c[i][3] = alpha;
 298                 }
 299         }
 300         */
 301         m.tex[0] = R_GetTexture(explosiontexture);
 302         m.texcoords[0] = &explosiontexcoords[0][0];
 303         m.texcoordstep[0] = sizeof(float[2]);
 304
 305         R_Mesh_Draw(&m);
 306
 307         /*
 308         if (fogenabled)
 309         {
 310                 m.blendfunc1 = GL_SRC_ALPHA;
 311                 m.blendfunc2 = GL_ONE;
 312                 for (i = 0;i < EXPLOSIONVERTS;i++)
 313                 {
 314                         VectorSubtract(e->vert[i], r_origin, diff);
 315                         fog = exp(fogdensity/DotProduct(diff,diff));
 316                         c[i][0] = fogcolor[0];
 317                         c[i][1] = fogcolor[1];
 318                         c[i][2] = fogcolor[2];
 319                         c[i][3] = alpha * fog;
 320                 }
 321                 //m.color = &c[0][0];
 322                 //m.colorstep = sizeof(float[4]);
 323                 m.tex[0] = R_GetTexture(explosiontexturefog);
 324                 R_Mesh_Draw(&m);
 325         }
 326         */
 327 }
 328
 329 void R_MoveExplosion(explosion_t *e/*, explosiongas_t **list, explosiongas_t **listend, */)
 330 {
 331         int i;
 332         float dot, frictionscale, end[3], impact[3], normal[3], frametime;
 333         /*
 334         vec3_t diff;
 335         vec_t dist;
 336         explosiongas_t **l;
 337         */
 338         frametime = cl.time - e->time;
 339         e->time = cl.time;
 340         e->alpha = EXPLOSIONFADESTART - (cl.time - e->starttime) * EXPLOSIONFADERATE;
 341         frictionscale = 1 - frametime;
 342         frictionscale = bound(0, frictionscale, 1);
 343         for (i = 0;i < EXPLOSIONVERTS;i++)
 344         {
 345                 if (e->vertvel[i][0] || e->vertvel[i][1] || e->vertvel[i][2])
 346                 {
 347                         //e->vertvel[i][2] += sv_gravity.value * frametime * -0.25f;
 348                         VectorScale(e->vertvel[i], frictionscale, e->vertvel[i]);
 349                         VectorMA(e->vert[i], frametime, e->vertvel[i], end);
 350                         if (r_explosionclip.integer)
 351                         {
 352                                 if (TraceLine(e->vert[i], end, impact, normal, 0, true) < 1)
 353                                 {
 354                                         // clip velocity against the wall
 355                                         dot = DotProduct(e->vertvel[i], normal) * -1.125f;
 356                                         VectorMA(e->vertvel[i], dot, normal, e->vertvel[i]);
 357                                 }
 358                                 VectorCopy(impact, e->vert[i]);
 359                         }
 360                         else
 361                                 VectorCopy(end, e->vert[i]);
 362                 }
 363                 /*
 364                 for (l = list;l < listend;l++)
 365                 {
 366                         VectorSubtract(e->vert[i], (*l)->origin, diff);
 367                         dist = DotProduct(diff, diff);
 368                         if (dist < 4096 && dist >= 1)
 369                         {
 370                                 dist = (*l)->pressure * frametime / dist;
 371                                 VectorMA(e->vertvel[i], dist, diff, e->vertvel[i]);
 372                         }
 373                 }
 374                 */
 375         }
 376         for (i = 0;i < EXPLOSIONGRID;i++)
 377                 VectorCopy(e->vert[i * (EXPLOSIONGRID + 1)], e->vert[i * (EXPLOSIONGRID + 1) + EXPLOSIONGRID]);
 378         memcpy(e->vert[EXPLOSIONGRID * (EXPLOSIONGRID + 1)], e->vert[0], sizeof(float[3]) * (EXPLOSIONGRID + 1));
 379 }
 380
 381 /*
 382 void R_MoveExplosionGas(explosiongas_t *e, explosiongas_t **list, explosiongas_t **listend, float frametime)
 383 {
 384         vec3_t end, diff;
 385         vec_t dist, frictionscale;
 386         explosiongas_t **l;
 387         frictionscale = 1 - frametime;
 388         frictionscale = bound(0, frictionscale, 1);
 389         if (e->velocity[0] || e->velocity[1] || e->velocity[2])
 390         {
 391                 end[0] = e->origin[0] + frametime * e->velocity[0];
 392                 end[1] = e->origin[1] + frametime * e->velocity[1];
 393                 end[2] = e->origin[2] + frametime * e->velocity[2];
 394                 if (r_explosionclip.integer)
 395                 {
 396                         float f, dot;
 397                         vec3_t impact, normal;
 398                         f = TraceLine(e->origin, end, impact, normal, 0, true);
 399                         VectorCopy(impact, e->origin);
 400                         if (f < 1)
 401                         {
 402                                 // clip velocity against the wall
 403                                 dot = DotProduct(e->velocity, normal) * -1.3f;
 404                                 e->velocity[0] += normal[0] * dot;
 405                                 e->velocity[1] += normal[1] * dot;
 406                                 e->velocity[2] += normal[2] * dot;
 407                         }
 408                 }
 409                 else
 410                 {
 411                         VectorCopy(end, e->origin);
 412                 }
 413                 e->velocity[2] += sv_gravity.value * frametime;
 414                 VectorScale(e->velocity, frictionscale, e->velocity);
 415         }
 416         for (l = list;l < listend;l++)
 417         {
 418                 if (*l != e)
 419                 {
 420                         VectorSubtract(e->origin, (*l)->origin, diff);
 421                         dist = DotProduct(diff, diff);
 422                         if (dist < 4096 && dist >= 1)
 423                         {
 424                                 dist = (*l)->pressure * frametime / dist;
 425                                 VectorMA(e->velocity, dist, diff, e->velocity);
 426                         }
 427                 }
 428         }
 429 }
 430 */
 431
 432 void R_MoveExplosions(void)
 433 {
 434         int i;
 435         float frametime;
 436 //      explosiongas_t *gaslist[MAX_EXPLOSIONGAS], **l, **end;
 437         frametime = cl.time - cl.oldtime;
 438         /*
 439         l = &gaslist[0];
 440         for (i = 0;i < MAX_EXPLOSIONGAS;i++)
 441         {
 442                 if (explosiongas[i].pressure > 0)
 443                 {
 444                         explosiongas[i].pressure -= frametime * GASFADERATE;
 445                         if (explosiongas[i].pressure > 0)
 446                                 *l++ = &explosiongas[i];
 447                 }
 448         }
 449         end = l;
 450         for (l = gaslist;l < end;l++)
 451                 R_MoveExplosionGas(*l, gaslist, end, frametime);
 452         */
 453
 454         for (i = 0;i < MAX_EXPLOSIONS;i++)
 455                 if (explosion[i].alpha > 0.01f)
 456                         R_MoveExplosion(&explosion[i]/*, gaslist, end, */);
 457 }
 458
 459 void R_DrawExplosions(void)
 460 {
 461         int i;
 462         if (!r_drawexplosions.integer)
 463                 return;
 464         for (i = 0;i < MAX_EXPLOSIONS;i++)
 465                 if (explosion[i].alpha > 0.01f)
 466                         R_DrawExplosion(&explosion[i]);
 467 }