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 16
  25 #define EXPLOSIONVERTS ((EXPLOSIONGRID+1)*(EXPLOSIONGRID+1))
  26 #define EXPLOSIONTRIS (EXPLOSIONVERTS*2)
  27 #define EXPLOSIONSTARTRADIUS (20.0f)
  28 #define EXPLOSIONSTARTVELOCITY (256.0f)
  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 vec3_t explosionspherevert[EXPLOSIONVERTS];
  51 vec3_t explosionspherevertvel[EXPLOSIONVERTS];
  52 float explosiontexcoords[EXPLOSIONVERTS][2];
  53 int explosiontris[EXPLOSIONTRIS][3];
  54 int explosionnoiseindex[EXPLOSIONVERTS];
  55 vec3_t explosionpoint[EXPLOSIONVERTS];
  56
  57 typedef struct explosion_s
  58 {
  59         float starttime;
  60         float alpha;
  61         vec3_t vert[EXPLOSIONVERTS];
  62         vec3_t vertvel[EXPLOSIONVERTS];
  63 }
  64 explosion_t;
  65
  66 explosion_t explosion[MAX_EXPLOSIONS];
  67
  68 rtexture_t      *explosiontexture;
  69 rtexture_t      *explosiontexturefog;
  70
  71 cvar_t r_explosionclip = {CVAR_SAVE, "r_explosionclip", "1"};
  72 cvar_t r_drawexplosions = {0, "r_drawexplosions", "1"};
  73
  74 int R_ExplosionVert(int column, int row)
  75 {
  76         int i;
  77         float a, b, c;
  78         i = row * (EXPLOSIONGRID + 1) + column;
  79         a = row * M_PI * 2 / EXPLOSIONGRID;
  80         b = column * M_PI * 2 / EXPLOSIONGRID;
  81         c = cos(b);
  82         explosionpoint[i][0] = cos(a) * c;
  83         explosionpoint[i][1] = sin(a) * c;
  84         explosionpoint[i][2] = -sin(b);
  85         explosionnoiseindex[i] = (row & (EXPLOSIONGRID - 1)) * EXPLOSIONGRID + (column & (EXPLOSIONGRID - 1));
  86         explosiontexcoords[i][0] = (float) column / (float) EXPLOSIONGRID;
  87         explosiontexcoords[i][1] = (float) row / (float) EXPLOSIONGRID;
  88         return i;
  89 }
  90
  91 void r_explosion_start(void)
  92 {
  93         int x, y;
  94         byte noise1[128][128], noise2[128][128], noise3[128][128], data[128][128][4];
  95         fractalnoise(&noise1[0][0], 128, 32);
  96         fractalnoise(&noise2[0][0], 128, 4);
  97         fractalnoise(&noise3[0][0], 128, 4);
  98         for (y = 0;y < 128;y++)
  99         {
 100                 for (x = 0;x < 128;x++)
 101                 {
 102                         int j, r, g, b, a;
 103                         j = (noise1[y][x] * noise2[y][x]) * 3 / 256 - 128;
 104                         r = (j * 512) / 256;
 105                         g = (j * 256) / 256;
 106                         b = (j * 128) / 256;
 107                         a = noise3[y][x] * 3 - 128;
 108                         data[y][x][0] = bound(0, r, 255);
 109                         data[y][x][1] = bound(0, g, 255);
 110                         data[y][x][2] = bound(0, b, 255);
 111                         data[y][x][3] = bound(0, a, 255);
 112                 }
 113         }
 114         explosiontexture = R_LoadTexture ("explosiontexture", 128, 128, &data[0][0][0], TEXF_MIPMAP | TEXF_ALPHA | TEXF_RGBA | TEXF_PRECACHE);
 115         for (y = 0;y < 128;y++)
 116                 for (x = 0;x < 128;x++)
 117                         data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
 118         explosiontexturefog = R_LoadTexture ("explosiontexturefog", 128, 128, &data[0][0][0], TEXF_MIPMAP | TEXF_ALPHA | TEXF_RGBA | TEXF_PRECACHE);
 119 }
 120
 121 void r_explosion_shutdown(void)
 122 {
 123 }
 124
 125 void r_explosion_newmap(void)
 126 {
 127         memset(explosion, 0, sizeof(explosion));
 128 //      memset(explosiongas, 0, sizeof(explosiongas));
 129 }
 130
 131 void R_Explosion_Init(void)
 132 {
 133         int i, x, y;
 134         i = 0;
 135         for (y = 0;y < EXPLOSIONGRID;y++)
 136         {
 137                 for (x = 0;x < EXPLOSIONGRID;x++)
 138                 {
 139                         explosiontris[i][0] = R_ExplosionVert(x    , y    );
 140                         explosiontris[i][1] = R_ExplosionVert(x + 1, y    );
 141                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 142                         i++;
 143                         explosiontris[i][0] = R_ExplosionVert(x + 1, y    );
 144                         explosiontris[i][1] = R_ExplosionVert(x + 1, y + 1);
 145                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 146                         i++;
 147                 }
 148         }
 149         for (i = 0;i < EXPLOSIONVERTS;i++)
 150         {
 151                 explosionspherevert[i][0] = explosionpoint[i][0] * EXPLOSIONSTARTRADIUS;
 152                 explosionspherevert[i][1] = explosionpoint[i][1] * EXPLOSIONSTARTRADIUS;
 153                 explosionspherevert[i][2] = explosionpoint[i][2] * EXPLOSIONSTARTRADIUS;
 154                 explosionspherevertvel[i][0] = explosionpoint[i][0] * EXPLOSIONSTARTVELOCITY;
 155                 explosionspherevertvel[i][1] = explosionpoint[i][1] * EXPLOSIONSTARTVELOCITY;
 156                 explosionspherevertvel[i][2] = explosionpoint[i][2] * EXPLOSIONSTARTVELOCITY;
 157         }
 158
 159         Cvar_RegisterVariable(&r_explosionclip);
 160         Cvar_RegisterVariable(&r_drawexplosions);
 161
 162         R_RegisterModule("R_Explosions", r_explosion_start, r_explosion_shutdown, r_explosion_newmap);
 163 }
 164
 165 void R_NewExplosion(vec3_t org)
 166 {
 167         int i, j;
 168         float dist, v[3];
 169         byte noise[EXPLOSIONGRID*EXPLOSIONGRID];
 170         fractalnoise(noise, EXPLOSIONGRID, 4);
 171         for (i = 0;i < MAX_EXPLOSIONS;i++)
 172         {
 173                 if (explosion[i].alpha <= 0.0f)
 174                 {
 175                         explosion[i].alpha = EXPLOSIONFADESTART;
 176                         for (j = 0;j < EXPLOSIONVERTS;j++)
 177                         {
 178                                 dist = noise[explosionnoiseindex[j]] * (1.0f / 256.0f) + 0.5;
 179                                 VectorMA(org, dist, explosionspherevert[j], v);
 180                                 TraceLine(org, v, explosion[i].vert[j], NULL, 0);
 181                                 VectorScale(explosionspherevertvel[j], dist, explosion[i].vertvel[j]);
 182                         }
 183                         break;
 184                 }
 185         }
 186
 187         /*
 188         i = 0;
 189         j = EXPLOSIONGAS;
 190         while (i < MAX_EXPLOSIONGAS && j > 0)
 191         {
 192                 while (explosiongas[i].pressure > 0)
 193                 {
 194                         i++;
 195                         if (i >= MAX_EXPLOSIONGAS)
 196                                 return;
 197                 }
 198                 VectorRandom(v);
 199                 VectorMA(org, EXPLOSIONGASSTARTRADIUS, v, v);
 200                 TraceLine(org, v, explosiongas[i].origin, NULL, 0);
 201                 VectorRandom(v);
 202                 VectorScale(v, EXPLOSIONGASSTARTVELOCITY, explosiongas[i].velocity);
 203                 explosiongas[i].pressure = j * GASDENSITY_SCALER;
 204                 j--;
 205         }
 206         */
 207 }
 208
 209 void R_DrawExplosion(explosion_t *e)
 210 {
 211         int i, index, *indexlist = &explosiontris[0][0], alpha = bound(0, e->alpha * 128.0f, 128), texnum, fogtexnum;
 212         float s, t;
 213 //      s = cl.time * 1;
 214 //      t = cl.time * 0.75;
 215 //      s -= (int) s;
 216 //      t -= (int) t;
 217         s = 0;
 218         t = 0;
 219         /*
 220         glColor4f(1,1,1,e->alpha);
 221         glDisable(GL_TEXTURE_2D);
 222 //      glBindTexture(GL_TEXTURE_2D, explosiontexture);
 223         glVertexPointer(3, GL_FLOAT, sizeof(float[3]), (float *) &e->vert[0][0]);
 224 //      glTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), (float *) &explosiontexcoords[0][0]);
 225         glEnableClientState(GL_VERTEX_ARRAY);
 226 //      glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 227         glDrawElements(GL_TRIANGLES, EXPLOSIONTRIS, GL_UNSIGNED_INT, indexlist);
 228 //      glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 229         glDisableClientState(GL_VERTEX_ARRAY);
 230         glEnable(GL_TEXTURE_2D);
 231         */
 232         texnum = R_GetTexture(explosiontexture);
 233         fogtexnum = R_GetTexture(explosiontexturefog);
 234         for (i = 0;i < EXPLOSIONTRIS;i++)
 235         {
 236                 transpolybegin(texnum, 0, fogtexnum, TPOLYTYPE_ALPHA);
 237                 index = *indexlist++;transpolyvert(e->vert[index][0], e->vert[index][1], e->vert[index][2], explosiontexcoords[index][0] + s, explosiontexcoords[index][1] + t, 255, 255, 255, alpha);
 238                 index = *indexlist++;transpolyvert(e->vert[index][0], e->vert[index][1], e->vert[index][2], explosiontexcoords[index][0] + s, explosiontexcoords[index][1] + t, 255, 255, 255, alpha);
 239                 index = *indexlist++;transpolyvert(e->vert[index][0], e->vert[index][1], e->vert[index][2], explosiontexcoords[index][0] + s, explosiontexcoords[index][1] + t, 255, 255, 255, alpha);
 240                 transpolyend();
 241         }
 242 }
 243
 244 void R_MoveExplosion(explosion_t *e, /*explosiongas_t **list, explosiongas_t **listend, */float frametime)
 245 {
 246         int i;
 247         vec3_t end;
 248         vec_t frictionscale;
 249         /*
 250         vec3_t diff;
 251         vec_t dist;
 252         explosiongas_t **l;
 253         */
 254         e->alpha -= frametime * EXPLOSIONFADERATE;
 255         frictionscale = 1 - frametime;
 256         frictionscale = bound(0, frictionscale, 1);
 257         for (i = 0;i < EXPLOSIONVERTS;i++)
 258         {
 259                 if (e->vertvel[i][0] || e->vertvel[i][1] || e->vertvel[i][2])
 260                 {
 261                         end[0] = e->vert[i][0] + frametime * e->vertvel[i][0];
 262                         end[1] = e->vert[i][1] + frametime * e->vertvel[i][1];
 263                         end[2] = e->vert[i][2] + frametime * e->vertvel[i][2];
 264                         if (r_explosionclip.value)
 265                         {
 266                                 float f, dot;
 267                                 vec3_t impact, normal;
 268                                 f = TraceLine(e->vert[i], end, impact, normal, 0);
 269                                 VectorCopy(impact, e->vert[i]);
 270                                 if (f < 1)
 271                                 {
 272                                         // clip velocity against the wall
 273                                         dot = DotProduct(e->vertvel[i], normal) * -1.125f;
 274                                         e->vertvel[i][0] += normal[0] * dot;
 275                                         e->vertvel[i][1] += normal[1] * dot;
 276                                         e->vertvel[i][2] += normal[2] * dot;
 277                                 }
 278                         }
 279                         else
 280                         {
 281                                 VectorCopy(end, e->vert[i]);
 282                         }
 283                         e->vertvel[i][2] += sv_gravity.value * frametime * -0.25f;
 284                         VectorScale(e->vertvel[i], frictionscale, e->vertvel[i]);
 285                 }
 286                 /*
 287                 for (l = list;l < listend;l++)
 288                 {
 289                         VectorSubtract(e->vert[i], (*l)->origin, diff);
 290                         dist = DotProduct(diff, diff);
 291                         if (dist < 4096 && dist >= 1)
 292                         {
 293                                 dist = (*l)->pressure * frametime / dist;
 294                                 VectorMA(e->vertvel[i], dist, diff, e->vertvel[i]);
 295                         }
 296                 }
 297                 */
 298         }
 299 }
 300
 301 /*
 302 void R_MoveExplosionGas(explosiongas_t *e, explosiongas_t **list, explosiongas_t **listend, float frametime)
 303 {
 304         vec3_t end, diff;
 305         vec_t dist, frictionscale;
 306         explosiongas_t **l;
 307         frictionscale = 1 - frametime;
 308         frictionscale = bound(0, frictionscale, 1);
 309         if (e->velocity[0] || e->velocity[1] || e->velocity[2])
 310         {
 311                 end[0] = e->origin[0] + frametime * e->velocity[0];
 312                 end[1] = e->origin[1] + frametime * e->velocity[1];
 313                 end[2] = e->origin[2] + frametime * e->velocity[2];
 314                 if (r_explosionclip.value)
 315                 {
 316                         float f, dot;
 317                         vec3_t impact, normal;
 318                         f = TraceLine(e->origin, end, impact, normal, 0);
 319                         VectorCopy(impact, e->origin);
 320                         if (f < 1)
 321                         {
 322                                 // clip velocity against the wall
 323                                 dot = DotProduct(e->velocity, normal) * -1.3f;
 324                                 e->velocity[0] += normal[0] * dot;
 325                                 e->velocity[1] += normal[1] * dot;
 326                                 e->velocity[2] += normal[2] * dot;
 327                         }
 328                 }
 329                 else
 330                 {
 331                         VectorCopy(end, e->origin);
 332                 }
 333                 e->velocity[2] += sv_gravity.value * frametime;
 334                 VectorScale(e->velocity, frictionscale, e->velocity);
 335         }
 336         for (l = list;l < listend;l++)
 337         {
 338                 if (*l != e)
 339                 {
 340                         VectorSubtract(e->origin, (*l)->origin, diff);
 341                         dist = DotProduct(diff, diff);
 342                         if (dist < 4096 && dist >= 1)
 343                         {
 344                                 dist = (*l)->pressure * frametime / dist;
 345                                 VectorMA(e->velocity, dist, diff, e->velocity);
 346                         }
 347                 }
 348         }
 349 }
 350 */
 351
 352 void R_MoveExplosions(void)
 353 {
 354         int i;
 355         float frametime;
 356 //      explosiongas_t *gaslist[MAX_EXPLOSIONGAS], **l, **end;
 357         frametime = cl.time - cl.oldtime;
 358         /*
 359         l = &gaslist[0];
 360         for (i = 0;i < MAX_EXPLOSIONGAS;i++)
 361         {
 362                 if (explosiongas[i].pressure > 0)
 363                 {
 364                         explosiongas[i].pressure -= frametime * GASFADERATE;
 365                         if (explosiongas[i].pressure > 0)
 366                                 *l++ = &explosiongas[i];
 367                 }
 368         }
 369         end = l;
 370         for (l = gaslist;l < end;l++)
 371                 R_MoveExplosionGas(*l, gaslist, end, frametime);
 372         */
 373
 374         for (i = 0;i < MAX_EXPLOSIONS;i++)
 375         {
 376                 if (explosion[i].alpha > 0.0f)
 377                 {
 378                         if (explosion[i].starttime > cl.time)
 379                         {
 380                                 explosion[i].alpha = 0;
 381                                 continue;
 382                         }
 383                         R_MoveExplosion(&explosion[i], /*gaslist, end, */frametime);
 384                 }
 385         }
 386 }
 387
 388 void R_DrawExplosions(void)
 389 {
 390         int i;
 391         if (!r_drawexplosions.value)
 392                 return;
 393         for (i = 0;i < MAX_EXPLOSIONS;i++)
 394         {
 395                 if (explosion[i].alpha > 0.0f)
 396                 {
 397                         R_DrawExplosion(&explosion[i]);
 398                 }
 399         }
 400 }