r_particles.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 static rtexturepool_t *particletexturepool;
  24
  25 // these are used by the decal system so they can't be static
  26 rtexture_t *particlefonttexture;
  27 // [0] is normal, [1] is fog, they may be the same
  28 particletexture_t particletexture[MAX_PARTICLETEXTURES][2];
  29
  30 static cvar_t r_drawparticles = {0, "r_drawparticles", "1"};
  31 static cvar_t r_particles_lighting = {0, "r_particles_lighting", "1"};
  32
  33 static byte shadebubble(float dx, float dy, vec3_t light)
  34 {
  35         float   dz, f, dot;
  36         vec3_t  normal;
  37         dz = 1 - (dx*dx+dy*dy);
  38         if (dz > 0) // it does hit the sphere
  39         {
  40                 f = 0;
  41                 // back side
  42                 normal[0] = dx;normal[1] = dy;normal[2] = dz;
  43                 VectorNormalize(normal);
  44                 dot = DotProduct(normal, light);
  45                 if (dot > 0.5) // interior reflection
  46                         f += ((dot *  2) - 1);
  47                 else if (dot < -0.5) // exterior reflection
  48                         f += ((dot * -2) - 1);
  49                 // front side
  50                 normal[0] = dx;normal[1] = dy;normal[2] = -dz;
  51                 VectorNormalize(normal);
  52                 dot = DotProduct(normal, light);
  53                 if (dot > 0.5) // interior reflection
  54                         f += ((dot *  2) - 1);
  55                 else if (dot < -0.5) // exterior reflection
  56                         f += ((dot * -2) - 1);
  57                 f *= 128;
  58                 f += 16; // just to give it a haze so you can see the outline
  59                 f = bound(0, f, 255);
  60                 return (byte) f;
  61         }
  62         else
  63                 return 0;
  64 }
  65
  66 static void setuptex(int cltexnum, int fog, int rtexnum, byte *data, byte *particletexturedata)
  67 {
  68         int basex, basey, y;
  69         basex = ((rtexnum >> 0) & 7) * 32;
  70         basey = ((rtexnum >> 3) & 7) * 32;
  71         particletexture[cltexnum][fog].s1 = (basex + 1) / 256.0f;
  72         particletexture[cltexnum][fog].t1 = (basey + 1) / 256.0f;
  73         particletexture[cltexnum][fog].s2 = (basex + 31) / 256.0f;
  74         particletexture[cltexnum][fog].t2 = (basey + 31) / 256.0f;
  75         for (y = 0;y < 32;y++)
  76                 memcpy(particletexturedata + ((basey + y) * 256 + basex) * 4, data + y * 32 * 4, 32 * 4);
  77 }
  78
  79 static void R_InitParticleTexture (void)
  80 {
  81         int             x,y,d,i,m;
  82         float   dx, dy, radius, f, f2;
  83         byte    data[32][32][4], noise1[64][64], noise2[64][64];
  84         vec3_t  light;
  85         byte    particletexturedata[256*256*4];
  86
  87         memset(particletexturedata, 255, sizeof(particletexturedata));
  88
  89         // the particletexture[][] array numbers must match the cl_part.c textures
  90         // smoke/blood
  91         for (i = 0;i < 8;i++)
  92         {
  93                 do
  94                 {
  95                         fractalnoise(&noise1[0][0], 64, 4);
  96                         fractalnoise(&noise2[0][0], 64, 8);
  97                         m = 0;
  98                         for (y = 0;y < 32;y++)
  99                         {
 100                                 dy = y - 16;
 101                                 for (x = 0;x < 32;x++)
 102                                 {
 103                                         d = (noise1[y][x] - 128) * 2 + 64; // was + 128
 104                                         d = bound(0, d, 255);
 105                                         data[y][x][0] = data[y][x][1] = data[y][x][2] = d;
 106                                         dx = x - 16;
 107                                         d = (noise2[y][x] - 128) * 3 + 192;
 108                                         if (d > 0)
 109                                                 d = (d * (256 - (int) (dx*dx+dy*dy))) >> 8;
 110                                         d = bound(0, d, 255);
 111                                         data[y][x][3] = (byte) d;
 112                                         if (m < d)
 113                                                 m = d;
 114                                 }
 115                         }
 116                 }
 117                 while (m < 224);
 118
 119                 setuptex(i + 0, 0, i + 0, &data[0][0][0], particletexturedata);
 120                 for (y = 0;y < 32;y++)
 121                         for (x = 0;x < 32;x++)
 122                                 data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
 123                 setuptex(i + 0, 1, i + 8, &data[0][0][0], particletexturedata);
 124         }
 125
 126         // bullet hole
 127         for (i = 0;i < 8;i++)
 128         {
 129                 float p[32][32];
 130                 fractalnoise(&noise1[0][0], 64, 8);
 131                 for (y = 0;y < 32;y++)
 132                         for (x = 0;x < 32;x++)
 133                                 p[y][x] = (noise1[y][x] / 8.0f) - 64.0f;
 134                 for (m = 0;m < 32;m++)
 135                 {
 136                         int j;
 137                         float fx, fy, f;
 138                         fx = lhrandom(14, 18);
 139                         fy = lhrandom(14, 18);
 140                         do
 141                         {
 142                                 dx = lhrandom(-1, 1);
 143                                 dy = lhrandom(-1, 1);
 144                                 f = (dx * dx + dy * dy);
 145                         }
 146                         while(f < 0.125f || f > 1.0f);
 147                         f = (m + 1) / 40.0f; //lhrandom(0.0f, 1.0);
 148                         dx *= 1.0f / 32.0f;
 149                         dy *= 1.0f / 32.0f;
 150                         for (j = 0;f > 0 && j < (32 * 14);j++)
 151                         {
 152                                 y = fy;
 153                                 x = fx;
 154                                 fx += dx;
 155                                 fy += dy;
 156                                 if (x < 1 || y < 1 || x >= 31 || y >= 31)
 157                                         break;
 158                                 p[y - 1][x - 1] += f * 0.125f;
 159                                 p[y - 1][x    ] += f * 0.25f;
 160                                 p[y - 1][x + 1] += f * 0.125f;
 161                                 p[y    ][x - 1] += f * 0.25f;
 162                                 p[y    ][x    ] += f;
 163                                 p[y    ][x + 1] += f * 0.25f;
 164                                 p[y + 1][x - 1] += f * 0.125f;
 165                                 p[y + 1][x    ] += f * 0.25f;
 166                                 p[y + 1][x + 1] += f * 0.125f;
 167 //                              f -= (0.5f / (32 * 16));
 168                         }
 169                 }
 170                 for (y = 0;y < 32;y++)
 171                 {
 172                         for (x = 0;x < 32;x++)
 173                         {
 174                                 m = p[y][x];
 175                                 data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
 176                                 data[y][x][3] = (byte) bound(0, m, 255);
 177                         }
 178                 }
 179
 180                 setuptex(i + 8, 0, i + 16, &data[0][0][0], particletexturedata);
 181                 setuptex(i + 8, 1, i + 16, &data[0][0][0], particletexturedata);
 182         }
 183
 184         // rain splash
 185         for (i = 0;i < 16;i++)
 186         {
 187                 radius = i * 3.0f / 16.0f;
 188                 f2 = 255.0f * ((15.0f - i) / 15.0f);
 189                 for (y = 0;y < 32;y++)
 190                 {
 191                         dy = (y - 16) * 0.25f;
 192                         for (x = 0;x < 32;x++)
 193                         {
 194                                 dx = (x - 16) * 0.25f;
 195                                 data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
 196                                 f = (1.0 - fabs(radius - sqrt(dx*dx+dy*dy))) * f2;
 197                                 f = bound(0.0f, f, 255.0f);
 198                                 data[y][x][3] = (int) f;
 199                         }
 200                 }
 201                 setuptex(i + 16, 0, i + 24, &data[0][0][0], particletexturedata);
 202                 setuptex(i + 16, 1, i + 24, &data[0][0][0], particletexturedata);
 203         }
 204
 205         // normal particle
 206         for (y = 0;y < 32;y++)
 207         {
 208                 dy = y - 16;
 209                 for (x = 0;x < 32;x++)
 210                 {
 211                         data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
 212                         dx = x - 16;
 213                         d = (256 - (dx*dx+dy*dy));
 214                         d = bound(0, d, 255);
 215                         data[y][x][3] = (byte) d;
 216                 }
 217         }
 218         setuptex(32, 0, 40, &data[0][0][0], particletexturedata);
 219         setuptex(32, 1, 40, &data[0][0][0], particletexturedata);
 220
 221         // rain
 222         light[0] = 1;light[1] = 1;light[2] = 1;
 223         VectorNormalize(light);
 224         for (y = 0;y < 32;y++)
 225         {
 226                 for (x = 0;x < 32;x++)
 227                 {
 228                         data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
 229                         data[y][x][3] = shadebubble((x - 16) * (1.0 / 8.0), y < 24 ? (y - 24) * (1.0 / 24.0) : (y - 24) * (1.0 / 8.0), light);
 230                 }
 231         }
 232         setuptex(33, 0, 41, &data[0][0][0], particletexturedata);
 233         setuptex(33, 1, 41, &data[0][0][0], particletexturedata);
 234
 235         // bubble
 236         light[0] = 1;light[1] = 1;light[2] = 1;
 237         VectorNormalize(light);
 238         for (y = 0;y < 32;y++)
 239         {
 240                 for (x = 0;x < 32;x++)
 241                 {
 242                         data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
 243                         data[y][x][3] = shadebubble((x - 16) * (1.0 / 16.0), (y - 16) * (1.0 / 16.0), light);
 244                 }
 245         }
 246         setuptex(34, 0, 42, &data[0][0][0], particletexturedata);
 247         setuptex(34, 1, 42, &data[0][0][0], particletexturedata);
 248
 249         // rocket flare
 250         for (y = 0;y < 32;y++)
 251         {
 252                 dy = y - 16;
 253                 for (x = 0;x < 32;x++)
 254                 {
 255                         dx = x - 16;
 256                         d = (2048.0f / (dx*dx+dy*dy+1)) - 8.0f;
 257                         data[y][x][0] = bound(0, d * 1.0f, 255);
 258                         data[y][x][1] = bound(0, d * 0.8f, 255);
 259                         data[y][x][2] = bound(0, d * 0.5f, 255);
 260                         data[y][x][3] = bound(0, d * 1.0f, 255);
 261                 }
 262         }
 263         setuptex(35, 0, 43, &data[0][0][0], particletexturedata);
 264         for (y = 0;y < 32;y++)
 265                 for (x = 0;x < 32;x++)
 266                         data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
 267         setuptex(35, 1, 44, &data[0][0][0], particletexturedata);
 268
 269         particlefonttexture = R_LoadTexture (particletexturepool, "particlefont", 256, 256, particletexturedata, TEXTYPE_RGBA, TEXF_ALPHA | TEXF_PRECACHE);
 270 }
 271
 272 static void r_part_start(void)
 273 {
 274         particletexturepool = R_AllocTexturePool();
 275         R_InitParticleTexture ();
 276 }
 277
 278 static void r_part_shutdown(void)
 279 {
 280         R_FreeTexturePool(&particletexturepool);
 281 }
 282
 283 static void r_part_newmap(void)
 284 {
 285 }
 286
 287 void R_Particles_Init (void)
 288 {
 289         Cvar_RegisterVariable(&r_drawparticles);
 290         Cvar_RegisterVariable(&r_particles_lighting);
 291         R_RegisterModule("R_Particles", r_part_start, r_part_shutdown, r_part_newmap);
 292 }
 293
 294 //int partindexarray[6] = {0, 1, 2, 0, 2, 3};
 295
 296 void R_DrawParticles (void)
 297 {
 298         renderparticle_t *r;
 299         int i, lighting;
 300         float minparticledist, org[3], uprightangles[3], up2[3], right2[3], v[3], right[3], up[3], tvxyz[4][4], tvst[4][2], fog, ifog, fogvec[3];
 301         mleaf_t *leaf;
 302         particletexture_t *tex, *texfog;
 303         rmeshinfo_t m;
 304
 305         // LordHavoc: early out conditions
 306         if ((!r_refdef.numparticles) || (!r_drawparticles.integer))
 307                 return;
 308
 309         lighting = r_particles_lighting.integer;
 310         if (!r_dynamic.integer)
 311                 lighting = 0;
 312
 313         c_particles += r_refdef.numparticles;
 314
 315         uprightangles[0] = 0;
 316         uprightangles[1] = r_refdef.viewangles[1];
 317         uprightangles[2] = 0;
 318         AngleVectors (uprightangles, NULL, right2, up2);
 319
 320         minparticledist = DotProduct(r_origin, vpn) + 16.0f;
 321
 322         // LordHavoc: this meshinfo must match up with R_Mesh_DrawDecal
 323         // LordHavoc: the commented out lines are hardwired behavior in R_Mesh_DrawDecal
 324         memset(&m, 0, sizeof(m));
 325         m.transparent = true;
 326         m.blendfunc1 = GL_SRC_ALPHA;
 327         m.blendfunc2 = GL_ONE_MINUS_SRC_ALPHA;
 328         //m.numtriangles = 2;
 329         //m.index = partindexarray;
 330         //m.numverts = 4;
 331         m.vertex = &tvxyz[0][0];
 332         //m.vertexstep = sizeof(float[4]);
 333         m.tex[0] = R_GetTexture(particlefonttexture);
 334         m.texcoords[0] = &tvst[0][0];
 335         //m.texcoordstep[0] = sizeof(float[2]);
 336
 337         for (i = 0, r = r_refdef.particles;i < r_refdef.numparticles;i++, r++)
 338         {
 339                 // LordHavoc: only render if not too close
 340                 if (DotProduct(r->org, vpn) < minparticledist)
 341                         continue;
 342
 343                 // LordHavoc: check if it's in a visible leaf
 344                 leaf = Mod_PointInLeaf(r->org, cl.worldmodel);
 345                 if (leaf->visframe != r_framecount)
 346                         continue;
 347
 348                 VectorCopy(r->org, org);
 349                 if (r->orientation == PARTICLE_BILLBOARD)
 350                 {
 351                         VectorScale(vright, r->scalex, right);
 352                         VectorScale(vup, r->scaley, up);
 353                 }
 354                 else if (r->orientation == PARTICLE_UPRIGHT_FACING)
 355                 {
 356                         VectorScale(right2, r->scalex, right);
 357                         VectorScale(up2, r->scaley, up);
 358                 }
 359                 else if (r->orientation == PARTICLE_ORIENTED_DOUBLESIDED)
 360                 {
 361                         // double-sided
 362                         if (DotProduct(r->dir, r_origin) > DotProduct(r->dir, org))
 363                         {
 364                                 VectorNegate(r->dir, v);
 365                                 VectorVectors(v, right, up);
 366                         }
 367                         else
 368                                 VectorVectors(r->dir, right, up);
 369                         VectorScale(right, r->scalex, right);
 370                         VectorScale(up, r->scaley, up);
 371                 }
 372                 else
 373                         Host_Error("R_DrawParticles: unknown particle orientation %i\n", r->orientation);
 374
 375                 m.cr = r->color[0];
 376                 m.cg = r->color[1];
 377                 m.cb = r->color[2];
 378                 m.ca = r->color[3];
 379                 if (lighting >= 1 && (r->dynlight || lighting >= 2))
 380                 {
 381                         R_CompleteLightPoint(v, org, true, leaf);
 382                         m.cr *= v[0];
 383                         m.cg *= v[1];
 384                         m.cb *= v[2];
 385                 }
 386
 387                 tex = &particletexture[r->tex][0];
 388
 389                 tvxyz[0][0] = org[0] - right[0] - up[0];
 390                 tvxyz[0][1] = org[1] - right[1] - up[1];
 391                 tvxyz[0][2] = org[2] - right[2] - up[2];
 392                 tvxyz[1][0] = org[0] - right[0] + up[0];
 393                 tvxyz[1][1] = org[1] - right[1] + up[1];
 394                 tvxyz[1][2] = org[2] - right[2] + up[2];
 395                 tvxyz[2][0] = org[0] + right[0] + up[0];
 396                 tvxyz[2][1] = org[1] + right[1] + up[1];
 397                 tvxyz[2][2] = org[2] + right[2] + up[2];
 398                 tvxyz[3][0] = org[0] + right[0] - up[0];
 399                 tvxyz[3][1] = org[1] + right[1] - up[1];
 400                 tvxyz[3][2] = org[2] + right[2] - up[2];
 401                 tvst[0][0] = tex->s1;
 402                 tvst[0][1] = tex->t1;
 403                 tvst[1][0] = tex->s1;
 404                 tvst[1][1] = tex->t2;
 405                 tvst[2][0] = tex->s2;
 406                 tvst[2][1] = tex->t2;
 407                 tvst[3][0] = tex->s2;
 408                 tvst[3][1] = tex->t1;
 409
 410                 if (r->additive)
 411                 {
 412                         m.blendfunc2 = GL_ONE;
 413                         fog = 0;
 414                         if (fogenabled)
 415                         {
 416                                 texfog = &particletexture[r->tex][1];
 417                                 VectorSubtract(org, r_origin, fogvec);
 418                                 ifog = 1 - exp(fogdensity/DotProduct(fogvec,fogvec));
 419                                 if (ifog < (1.0f - (1.0f / 64.0f)))
 420                                 {
 421                                         if (ifog >= (1.0f / 64.0f))
 422                                         {
 423                                                 // partially fogged, darken it
 424                                                 m.cr *= ifog;
 425                                                 m.cg *= ifog;
 426                                                 m.cb *= ifog;
 427                                                 R_Mesh_DrawDecal(&m);
 428                                         }
 429                                 }
 430                                 else
 431                                         R_Mesh_DrawDecal(&m);
 432                         }
 433                         else
 434                                 R_Mesh_DrawDecal(&m);
 435                 }
 436                 else
 437                 {
 438                         m.blendfunc2 = GL_ONE_MINUS_SRC_ALPHA;
 439                         fog = 0;
 440                         if (fogenabled)
 441                         {
 442                                 texfog = &particletexture[r->tex][1];
 443                                 VectorSubtract(org, r_origin, fogvec);
 444                                 fog = exp(fogdensity/DotProduct(fogvec,fogvec));
 445                                 if (fog >= (1.0f / 64.0f))
 446                                 {
 447                                         if (fog >= (1.0f - (1.0f / 64.0f)))
 448                                         {
 449                                                 // fully fogged, just use the fog texture and render as alpha
 450                                                 m.cr = fogcolor[0];
 451                                                 m.cg = fogcolor[1];
 452                                                 m.cb = fogcolor[2];
 453                                                 m.ca = r->color[3];
 454                                                 tvst[0][0] = texfog->s1;
 455                                                 tvst[0][1] = texfog->t1;
 456                                                 tvst[1][0] = texfog->s1;
 457                                                 tvst[1][1] = texfog->t2;
 458                                                 tvst[2][0] = texfog->s2;
 459                                                 tvst[2][1] = texfog->t2;
 460                                                 tvst[3][0] = texfog->s2;
 461                                                 tvst[3][1] = texfog->t1;
 462                                                 R_Mesh_DrawDecal(&m);
 463                                         }
 464                                         else
 465                                         {
 466                                                 // partially fogged, darken the first pass
 467                                                 ifog = 1 - fog;
 468                                                 m.cr *= ifog;
 469                                                 m.cg *= ifog;
 470                                                 m.cb *= ifog;
 471                                                 if (tex->s1 == texfog->s1 && tex->t1 == texfog->t1)
 472                                                 {
 473                                                         // fog texture is the same as the base, just change the color
 474                                                         m.cr += fogcolor[0] * fog;
 475                                                         m.cg += fogcolor[1] * fog;
 476                                                         m.cb += fogcolor[2] * fog;
 477                                                         R_Mesh_DrawDecal(&m);
 478                                                 }
 479                                                 else
 480                                                 {
 481                                                         // render the first pass (alpha), then do additive fog
 482                                                         R_Mesh_DrawDecal(&m);
 483
 484                                                         m.blendfunc2 = GL_ONE;
 485                                                         m.cr = fogcolor[0];
 486                                                         m.cg = fogcolor[1];
 487                                                         m.cb = fogcolor[2];
 488                                                         m.ca = r->color[3] * fog;
 489                                                         tvst[0][0] = texfog->s1;
 490                                                         tvst[0][1] = texfog->t1;
 491                                                         tvst[1][0] = texfog->s1;
 492                                                         tvst[1][1] = texfog->t2;
 493                                                         tvst[2][0] = texfog->s2;
 494                                                         tvst[2][1] = texfog->t2;
 495                                                         tvst[3][0] = texfog->s2;
 496                                                         tvst[3][1] = texfog->t1;
 497                                                         R_Mesh_DrawDecal(&m);
 498                                                 }
 499                                         }
 500                                 }
 501                                 else
 502                                         R_Mesh_DrawDecal(&m);
 503                         }
 504                         else
 505                                 R_Mesh_DrawDecal(&m);
 506                 }
 507         }
 508 }