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 EXPLOSIONSTARTRADIUS (20.0f)
  28 #define EXPLOSIONSTARTVELOCITY (256.0f)
  29 #define EXPLOSIONRANDOMVELOCITY (64.0f)
  30 #define EXPLOSIONFADESTART (1.5f)
  31 #define EXPLOSIONFADERATE (4.5f)
  32 /*
  33 #define MAX_EXPLOSIONGAS (MAX_EXPLOSIONS * EXPLOSIONGAS)
  34 #define EXPLOSIONGAS 8
  35 #define EXPLOSIONGASSTARTRADIUS (15.0f)
  36 #define EXPLOSIONGASSTARTVELOCITY (50.0f)
  37 #define GASDENSITY_SCALER (32768.0f / EXPLOSIONGAS)
  38 #define GASFADERATE (GASDENSITY_SCALER * EXPLOSIONGAS * 2)
  39
  40 typedef struct explosiongas_s
  41 {
  42         float pressure;
  43         vec3_t origin;
  44         vec3_t velocity;
  45 }
  46 explosiongas_t;
  47
  48 explosiongas_t explosiongas[MAX_EXPLOSIONGAS];
  49 */
  50
  51 vec3_t explosionspherevert[EXPLOSIONVERTS];
  52 vec3_t explosionspherevertvel[EXPLOSIONVERTS];
  53 float explosiontexcoords[EXPLOSIONVERTS][2];
  54 int explosiontris[EXPLOSIONTRIS][3];
  55 int explosionnoiseindex[EXPLOSIONVERTS];
  56 vec3_t explosionpoint[EXPLOSIONVERTS];
  57
  58 typedef struct explosion_s
  59 {
  60         float starttime;
  61         float alpha;
  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         explosionnoiseindex[i] = (row % EXPLOSIONGRID) * EXPLOSIONGRID + (column % EXPLOSIONGRID);
 132         explosiontexcoords[i][0] = (float) column / (float) EXPLOSIONGRID;
 133         explosiontexcoords[i][1] = (float) row / (float) EXPLOSIONGRID;
 134         return i;
 135 }
 136
 137 void R_Explosion_Init(void)
 138 {
 139         int i, x, y;
 140         i = 0;
 141         for (y = 0;y < EXPLOSIONGRID;y++)
 142         {
 143                 for (x = 0;x < EXPLOSIONGRID;x++)
 144                 {
 145                         explosiontris[i][0] = R_ExplosionVert(x    , y    );
 146                         explosiontris[i][1] = R_ExplosionVert(x + 1, y    );
 147                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 148                         i++;
 149                         explosiontris[i][0] = R_ExplosionVert(x + 1, y    );
 150                         explosiontris[i][1] = R_ExplosionVert(x + 1, y + 1);
 151                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 152                         i++;
 153                 }
 154         }
 155         for (i = 0;i < EXPLOSIONVERTS;i++)
 156         {
 157                 explosionspherevert[i][0] = explosionpoint[i][0] * EXPLOSIONSTARTRADIUS;
 158                 explosionspherevert[i][1] = explosionpoint[i][1] * EXPLOSIONSTARTRADIUS;
 159                 explosionspherevert[i][2] = explosionpoint[i][2] * EXPLOSIONSTARTRADIUS;
 160                 explosionspherevertvel[i][0] = explosionpoint[i][0] * EXPLOSIONSTARTVELOCITY;
 161                 explosionspherevertvel[i][1] = explosionpoint[i][1] * EXPLOSIONSTARTVELOCITY;
 162                 explosionspherevertvel[i][2] = explosionpoint[i][2] * EXPLOSIONSTARTVELOCITY;
 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, v[3], normal[3];
 175         byte noise[4][EXPLOSIONGRID*EXPLOSIONGRID];
 176         fractalnoise(noise[0], EXPLOSIONGRID, 4);
 177         fractalnoise(noise[1], EXPLOSIONGRID, 2);
 178         fractalnoise(noise[2], EXPLOSIONGRID, 2);
 179         fractalnoise(noise[3], EXPLOSIONGRID, 2);
 180         for (i = 0;i < MAX_EXPLOSIONS;i++)
 181         {
 182                 if (explosion[i].alpha <= 0.0f)
 183                 {
 184                         explosion[i].alpha = EXPLOSIONFADESTART;
 185                         for (j = 0;j < EXPLOSIONVERTS;j++)
 186                         {
 187                                 dist = noise[3][explosionnoiseindex[j]] * (1.0f / 256.0f) + 0.5;
 188                                 VectorMA(org, dist, explosionspherevert[j], v);
 189                                 TraceLine(org, v, explosion[i].vert[j], normal, 0);
 190                                 VectorAdd(explosion[i].vert[j], normal, explosion[i].vert[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);
 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;
 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         if (fogenabled)
 243         {
 244                 m.color = &c[0][0];
 245                 m.colorstep = sizeof(float[4]);
 246                 for (i = 0;i < EXPLOSIONVERTS;i++)
 247                 {
 248                         // use inverse fog alpha as color
 249                         VectorSubtract(e->vert[i], r_origin, diff);
 250                         ifog = 1 - exp(fogdensity/DotProduct(diff,diff));
 251                         if (ifog < 0)
 252                                 ifog = 0;
 253                         c[i][0] = ifog;
 254                         c[i][1] = ifog;
 255                         c[i][2] = ifog;
 256                         c[i][3] = alpha;
 257                 }
 258         }
 259         m.tex[0] = R_GetTexture(explosiontexture);
 260         m.texcoords[0] = &explosiontexcoords[0][0];
 261         m.texcoordstep[0] = sizeof(float[2]);
 262
 263         R_Mesh_Draw(&m);
 264
 265         if (fogenabled)
 266         {
 267                 m.blendfunc1 = GL_SRC_ALPHA;
 268                 m.blendfunc2 = GL_ONE;
 269                 for (i = 0;i < EXPLOSIONVERTS;i++)
 270                 {
 271                         VectorSubtract(e->vert[i], r_origin, diff);
 272                         fog = exp(fogdensity/DotProduct(diff,diff));
 273                         c[i][0] = fogcolor[0];
 274                         c[i][1] = fogcolor[1];
 275                         c[i][2] = fogcolor[2];
 276                         c[i][3] = alpha * fog;
 277                 }
 278                 //m.color = &c[0][0];
 279                 //m.colorstep = sizeof(float[4]);
 280                 m.tex[0] = R_GetTexture(explosiontexturefog);
 281                 R_Mesh_Draw(&m);
 282         }
 283 }
 284
 285 void R_MoveExplosion(explosion_t *e, /*explosiongas_t **list, explosiongas_t **listend, */float frametime)
 286 {
 287         int i;
 288         float f, dot, frictionscale, end[3], impact[3], normal[3];
 289         /*
 290         vec3_t diff;
 291         vec_t dist;
 292         explosiongas_t **l;
 293         */
 294         e->alpha -= frametime * EXPLOSIONFADERATE;
 295         frictionscale = 1 - frametime;
 296         frictionscale = bound(0, frictionscale, 1);
 297         for (i = 0;i < EXPLOSIONVERTS;i++)
 298         {
 299                 if (e->vertvel[i][0] || e->vertvel[i][1] || e->vertvel[i][2])
 300                 {
 301                         end[0] = e->vert[i][0] + frametime * e->vertvel[i][0];
 302                         end[1] = e->vert[i][1] + frametime * e->vertvel[i][1];
 303                         end[2] = e->vert[i][2] + frametime * e->vertvel[i][2];
 304                         if (r_explosionclip.integer)
 305                         {
 306                                 f = TraceLine(e->vert[i], end, impact, normal, 0);
 307                                 VectorCopy(impact, e->vert[i]);
 308                                 if (f < 1)
 309                                 {
 310                                         // clip velocity against the wall
 311                                         dot = DotProduct(e->vertvel[i], normal) * 1.125f;
 312                                         e->vertvel[i][0] -= normal[0] * dot;
 313                                         e->vertvel[i][1] -= normal[1] * dot;
 314                                         e->vertvel[i][2] -= normal[2] * dot;
 315                                 }
 316                         }
 317                         else
 318                         {
 319                                 VectorCopy(end, e->vert[i]);
 320                         }
 321                         e->vertvel[i][2] += sv_gravity.value * frametime * -0.25f;
 322                         VectorScale(e->vertvel[i], frictionscale, e->vertvel[i]);
 323                 }
 324                 /*
 325                 for (l = list;l < listend;l++)
 326                 {
 327                         VectorSubtract(e->vert[i], (*l)->origin, diff);
 328                         dist = DotProduct(diff, diff);
 329                         if (dist < 4096 && dist >= 1)
 330                         {
 331                                 dist = (*l)->pressure * frametime / dist;
 332                                 VectorMA(e->vertvel[i], dist, diff, e->vertvel[i]);
 333                         }
 334                 }
 335                 */
 336         }
 337 }
 338
 339 /*
 340 void R_MoveExplosionGas(explosiongas_t *e, explosiongas_t **list, explosiongas_t **listend, float frametime)
 341 {
 342         vec3_t end, diff;
 343         vec_t dist, frictionscale;
 344         explosiongas_t **l;
 345         frictionscale = 1 - frametime;
 346         frictionscale = bound(0, frictionscale, 1);
 347         if (e->velocity[0] || e->velocity[1] || e->velocity[2])
 348         {
 349                 end[0] = e->origin[0] + frametime * e->velocity[0];
 350                 end[1] = e->origin[1] + frametime * e->velocity[1];
 351                 end[2] = e->origin[2] + frametime * e->velocity[2];
 352                 if (r_explosionclip.integer)
 353                 {
 354                         float f, dot;
 355                         vec3_t impact, normal;
 356                         f = TraceLine(e->origin, end, impact, normal, 0);
 357                         VectorCopy(impact, e->origin);
 358                         if (f < 1)
 359                         {
 360                                 // clip velocity against the wall
 361                                 dot = DotProduct(e->velocity, normal) * -1.3f;
 362                                 e->velocity[0] += normal[0] * dot;
 363                                 e->velocity[1] += normal[1] * dot;
 364                                 e->velocity[2] += normal[2] * dot;
 365                         }
 366                 }
 367                 else
 368                 {
 369                         VectorCopy(end, e->origin);
 370                 }
 371                 e->velocity[2] += sv_gravity.value * frametime;
 372                 VectorScale(e->velocity, frictionscale, e->velocity);
 373         }
 374         for (l = list;l < listend;l++)
 375         {
 376                 if (*l != e)
 377                 {
 378                         VectorSubtract(e->origin, (*l)->origin, diff);
 379                         dist = DotProduct(diff, diff);
 380                         if (dist < 4096 && dist >= 1)
 381                         {
 382                                 dist = (*l)->pressure * frametime / dist;
 383                                 VectorMA(e->velocity, dist, diff, e->velocity);
 384                         }
 385                 }
 386         }
 387 }
 388 */
 389
 390 void R_MoveExplosions(void)
 391 {
 392         int i;
 393         float frametime;
 394 //      explosiongas_t *gaslist[MAX_EXPLOSIONGAS], **l, **end;
 395         frametime = cl.time - cl.oldtime;
 396         /*
 397         l = &gaslist[0];
 398         for (i = 0;i < MAX_EXPLOSIONGAS;i++)
 399         {
 400                 if (explosiongas[i].pressure > 0)
 401                 {
 402                         explosiongas[i].pressure -= frametime * GASFADERATE;
 403                         if (explosiongas[i].pressure > 0)
 404                                 *l++ = &explosiongas[i];
 405                 }
 406         }
 407         end = l;
 408         for (l = gaslist;l < end;l++)
 409                 R_MoveExplosionGas(*l, gaslist, end, frametime);
 410         */
 411
 412         for (i = 0;i < MAX_EXPLOSIONS;i++)
 413         {
 414                 if (explosion[i].alpha > 0.0f)
 415                 {
 416                         if (explosion[i].starttime > cl.time)
 417                         {
 418                                 explosion[i].alpha = 0;
 419                                 continue;
 420                         }
 421                         R_MoveExplosion(&explosion[i], /*gaslist, end, */frametime);
 422                 }
 423         }
 424 }
 425
 426 void R_DrawExplosions(void)
 427 {
 428         int i;
 429         if (!r_drawexplosions.integer)
 430                 return;
 431         for (i = 0;i < MAX_EXPLOSIONS;i++)
 432         {
 433                 if (explosion[i].alpha > 0.0f)
 434                 {
 435                         R_DrawExplosion(&explosion[i]);
 436                 }
 437         }
 438 }