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         for (i = 0;i < 8;i++)
  91         {
  92                 do
  93                 {
  94                         fractalnoise(&noise1[0][0], 64, 4);
  95                         fractalnoise(&noise2[0][0], 64, 8);
  96                         m = 0;
  97                         for (y = 0;y < 32;y++)
  98                         {
  99                                 dy = y - 16;
 100                                 for (x = 0;x < 32;x++)
 101                                 {
 102                                         d = (noise1[y][x] - 128) * 2 + 64; // was + 128
 103                                         d = bound(0, d, 255);
 104                                         data[y][x][0] = data[y][x][1] = data[y][x][2] = d;
 105                                         dx = x - 16;
 106                                         d = (noise2[y][x] - 128) * 3 + 192;
 107                                         if (d > 0)
 108                                                 d = (d * (256 - (int) (dx*dx+dy*dy))) >> 8;
 109                                         d = bound(0, d, 255);
 110                                         data[y][x][3] = (byte) d;
 111                                         if (m < d)
 112                                                 m = d;
 113                                 }
 114                         }
 115                 }
 116                 while (m < 224);
 117
 118                 setuptex(i + 0, 0, i + 0, &data[0][0][0], particletexturedata);
 119                 for (y = 0;y < 32;y++)
 120                         for (x = 0;x < 32;x++)
 121                                 data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
 122                 setuptex(i + 0, 1, i + 8, &data[0][0][0], particletexturedata);
 123         }
 124
 125         for (i = 0;i < 8;i++)
 126         {
 127                 float p[32][32];
 128                 fractalnoise(&noise1[0][0], 64, 8);
 129                 for (y = 0;y < 32;y++)
 130                         for (x = 0;x < 32;x++)
 131                                 p[y][x] = (noise1[y][x] / 8.0f) - 64.0f;
 132                 for (m = 0;m < 32;m++)
 133                 {
 134                         int j;
 135                         float fx, fy, f;
 136                         fx = lhrandom(14, 18);
 137                         fy = lhrandom(14, 18);
 138                         do
 139                         {
 140                                 dx = lhrandom(-1, 1);
 141                                 dy = lhrandom(-1, 1);
 142                                 f = (dx * dx + dy * dy);
 143                         }
 144                         while(f < 0.125f || f > 1.0f);
 145                         f = (m + 1) / 40.0f; //lhrandom(0.0f, 1.0);
 146                         dx *= 1.0f / 32.0f;
 147                         dy *= 1.0f / 32.0f;
 148                         for (j = 0;f > 0 && j < (32 * 14);j++)
 149                         {
 150                                 y = fy;
 151                                 x = fx;
 152                                 fx += dx;
 153                                 fy += dy;
 154                                 if (x < 1 || y < 1 || x >= 31 || y >= 31)
 155                                         break;
 156                                 p[y - 1][x - 1] += f * 0.125f;
 157                                 p[y - 1][x    ] += f * 0.25f;
 158                                 p[y - 1][x + 1] += f * 0.125f;
 159                                 p[y    ][x - 1] += f * 0.25f;
 160                                 p[y    ][x    ] += f;
 161                                 p[y    ][x + 1] += f * 0.25f;
 162                                 p[y + 1][x - 1] += f * 0.125f;
 163                                 p[y + 1][x    ] += f * 0.25f;
 164                                 p[y + 1][x + 1] += f * 0.125f;
 165 //                              f -= (0.5f / (32 * 16));
 166                         }
 167                 }
 168                 for (y = 0;y < 32;y++)
 169                 {
 170                         for (x = 0;x < 32;x++)
 171                         {
 172                                 m = p[y][x];
 173                                 data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
 174                                 data[y][x][3] = (byte) bound(0, m, 255);
 175                         }
 176                 }
 177
 178                 setuptex(i + 8, 0, i + 16, &data[0][0][0], particletexturedata);
 179                 setuptex(i + 8, 1, i + 16, &data[0][0][0], particletexturedata);
 180         }
 181
 182         for (i = 0;i < 16;i++)
 183         {
 184                 radius = i * 3.0f / 16.0f;
 185                 f2 = 255.0f * ((15.0f - i) / 15.0f);
 186                 for (y = 0;y < 32;y++)
 187                 {
 188                         dy = (y - 16) * 0.25f;
 189                         for (x = 0;x < 32;x++)
 190                         {
 191                                 dx = (x - 16) * 0.25f;
 192                                 data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
 193                                 f = (1.0 - fabs(radius - sqrt(dx*dx+dy*dy))) * f2;
 194                                 f = bound(0.0f, f, 255.0f);
 195                                 data[y][x][3] = (int) f;
 196                         }
 197                 }
 198                 setuptex(i + 16, 0, i + 24, &data[0][0][0], particletexturedata);
 199                 setuptex(i + 16, 1, i + 24, &data[0][0][0], particletexturedata);
 200         }
 201
 202         for (y = 0;y < 32;y++)
 203         {
 204                 dy = y - 16;
 205                 for (x = 0;x < 32;x++)
 206                 {
 207                         data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
 208                         dx = x - 16;
 209                         d = (256 - (dx*dx+dy*dy));
 210                         d = bound(0, d, 255);
 211                         data[y][x][3] = (byte) d;
 212                 }
 213         }
 214         setuptex(32, 0, 40, &data[0][0][0], particletexturedata);
 215         setuptex(32, 1, 40, &data[0][0][0], particletexturedata);
 216
 217         light[0] = 1;light[1] = 1;light[2] = 1;
 218         VectorNormalize(light);
 219         for (y = 0;y < 32;y++)
 220         {
 221                 for (x = 0;x < 32;x++)
 222                 {
 223                         data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
 224                         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);
 225                 }
 226         }
 227         setuptex(33, 0, 41, &data[0][0][0], particletexturedata);
 228         setuptex(33, 1, 41, &data[0][0][0], particletexturedata);
 229
 230         light[0] = 1;light[1] = 1;light[2] = 1;
 231         VectorNormalize(light);
 232         for (y = 0;y < 32;y++)
 233         {
 234                 for (x = 0;x < 32;x++)
 235                 {
 236                         data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
 237                         data[y][x][3] = shadebubble((x - 16) * (1.0 / 16.0), (y - 16) * (1.0 / 16.0), light);
 238                 }
 239         }
 240         setuptex(34, 0, 42, &data[0][0][0], particletexturedata);
 241         setuptex(34, 1, 42, &data[0][0][0], particletexturedata);
 242
 243         for (y = 0;y < 32;y++)
 244         {
 245                 dy = y - 16;
 246                 for (x = 0;x < 32;x++)
 247                 {
 248                         dx = x - 16;
 249                         d = (2048.0f / (dx*dx+dy*dy+1)) - 8.0f;
 250                         data[y][x][0] = bound(0, d * 1.0f, 255);
 251                         data[y][x][1] = bound(0, d * 0.8f, 255);
 252                         data[y][x][2] = bound(0, d * 0.5f, 255);
 253                         data[y][x][3] = bound(0, d * 1.0f, 255);
 254                 }
 255         }
 256         setuptex(35, 0, 43, &data[0][0][0], particletexturedata);
 257         for (y = 0;y < 32;y++)
 258                 for (x = 0;x < 32;x++)
 259                         data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
 260         setuptex(35, 1, 44, &data[0][0][0], particletexturedata);
 261
 262         particlefonttexture = R_LoadTexture (particletexturepool, "particlefont", 256, 256, particletexturedata, TEXTYPE_RGBA, TEXF_ALPHA | TEXF_PRECACHE);
 263 }
 264
 265 static void r_part_start(void)
 266 {
 267         particletexturepool = R_AllocTexturePool();
 268         R_InitParticleTexture ();
 269 }
 270
 271 static void r_part_shutdown(void)
 272 {
 273         R_FreeTexturePool(&particletexturepool);
 274 }
 275
 276 static void r_part_newmap(void)
 277 {
 278 }
 279
 280 void R_Particles_Init (void)
 281 {
 282         Cvar_RegisterVariable(&r_drawparticles);
 283         Cvar_RegisterVariable(&r_particles_lighting);
 284         R_RegisterModule("R_Particles", r_part_start, r_part_shutdown, r_part_newmap);
 285 }
 286
 287 int partindexarray[6] = {0, 1, 2, 0, 2, 3};
 288
 289 void R_DrawParticles (void)
 290 {
 291         renderparticle_t *r;
 292         int i, lighting;
 293         float minparticledist, org[3], uprightangles[3], up2[3], right2[3], v[3], right[3], up[3], tv[4][5], fog, diff[3];
 294         mleaf_t *leaf;
 295         particletexture_t *tex, *texfog;
 296         rmeshinfo_t m;
 297
 298         // LordHavoc: early out conditions
 299         if ((!r_refdef.numparticles) || (!r_drawparticles.integer))
 300                 return;
 301
 302         lighting = r_particles_lighting.integer;
 303         if (!r_dynamic.integer)
 304                 lighting = 0;
 305
 306         c_particles += r_refdef.numparticles;
 307
 308         uprightangles[0] = 0;
 309         uprightangles[1] = r_refdef.viewangles[1];
 310         uprightangles[2] = 0;
 311         AngleVectors (uprightangles, NULL, right2, up2);
 312
 313         minparticledist = DotProduct(r_origin, vpn) + 16.0f;
 314
 315         memset(&m, 0, sizeof(m));
 316         m.transparent = true;
 317         m.blendfunc1 = GL_SRC_ALPHA;
 318         m.blendfunc2 = GL_ONE_MINUS_SRC_ALPHA;
 319         m.numtriangles = 2;
 320         m.index = partindexarray;
 321         m.numverts = 4;
 322         m.vertex = &tv[0][0];
 323         m.vertexstep = sizeof(float[5]);
 324         m.tex[0] = R_GetTexture(particlefonttexture);
 325         m.texcoords[0] = &tv[0][3];
 326         m.texcoordstep[0] = sizeof(float[5]);
 327
 328         for (i = 0, r = r_refdef.particles;i < r_refdef.numparticles;i++, r++)
 329         {
 330                 // LordHavoc: only render if not too close
 331                 if (DotProduct(r->org, vpn) < minparticledist)
 332                         continue;
 333
 334                 // LordHavoc: check if it's in a visible leaf
 335                 leaf = Mod_PointInLeaf(r->org, cl.worldmodel);
 336                 if (leaf->visframe != r_framecount)
 337                         continue;
 338
 339                 VectorCopy(r->org, org);
 340                 if (r->orientation == PARTICLE_BILLBOARD)
 341                 {
 342                         VectorScale(vright, r->scale, right);
 343                         VectorScale(vup, r->scale, up);
 344                 }
 345                 else if (r->orientation == PARTICLE_UPRIGHT_FACING)
 346                 {
 347                         VectorScale(right2, r->scale, right);
 348                         VectorScale(up2, r->scale, up);
 349                 }
 350                 else if (r->orientation == PARTICLE_ORIENTED_DOUBLESIDED)
 351                 {
 352                         // double-sided
 353                         if (DotProduct(r->dir, r_origin) > DotProduct(r->dir, org))
 354                         {
 355                                 VectorNegate(r->dir, v);
 356                                 VectorVectors(v, right, up);
 357                         }
 358                         else
 359                                 VectorVectors(r->dir, right, up);
 360                         VectorScale(right, r->scale, right);
 361                         VectorScale(up, r->scale, up);
 362                 }
 363                 else
 364                         Host_Error("R_DrawParticles: unknown particle orientation %i\n", r->orientation);
 365
 366                 m.cr = r->color[0];
 367                 m.cg = r->color[1];
 368                 m.cb = r->color[2];
 369                 m.ca = r->color[3];
 370                 if (lighting >= 1 && (r->dynlight || lighting >= 2))
 371                 {
 372                         R_CompleteLightPoint(v, org, true, leaf);
 373                         m.cr *= v[0];
 374                         m.cg *= v[1];
 375                         m.cb *= v[2];
 376                 }
 377
 378                 tex = &particletexture[r->tex][0];
 379                 texfog = &particletexture[r->tex][1];
 380
 381                 fog = 0;
 382                 if (fogenabled)
 383                 {
 384                         VectorSubtract(org, r_origin, diff);
 385                         fog = exp(fogdensity/DotProduct(diff,diff));
 386                         if (fog >= 0.01f)
 387                         {
 388                                 if (fog > 1)
 389                                         fog = 1;
 390                                 m.cr *= 1 - fog;
 391                                 m.cg *= 1 - fog;
 392                                 m.cb *= 1 - fog;
 393                                 if (tex->s1 == texfog->s1 && tex->t1 == texfog->t1)
 394                                 {
 395                                         m.cr += fogcolor[0] * fog;
 396                                         m.cg += fogcolor[1] * fog;
 397                                         m.cb += fogcolor[2] * fog;
 398                                 }
 399                         }
 400                         else
 401                                 fog = 0;
 402                 }
 403
 404                 tv[0][0] = org[0] - right[0] - up[0];
 405                 tv[0][1] = org[1] - right[1] - up[1];
 406                 tv[0][2] = org[2] - right[2] - up[2];
 407                 tv[0][3] = tex->s1;
 408                 tv[0][4] = tex->t1;
 409                 tv[1][0] = org[0] - right[0] + up[0];
 410                 tv[1][1] = org[1] - right[1] + up[1];
 411                 tv[1][2] = org[2] - right[2] + up[2];
 412                 tv[1][3] = tex->s1;
 413                 tv[1][4] = tex->t2;
 414                 tv[2][0] = org[0] + right[0] + up[0];
 415                 tv[2][1] = org[1] + right[1] + up[1];
 416                 tv[2][2] = org[2] + right[2] + up[2];
 417                 tv[2][3] = tex->s2;
 418                 tv[2][4] = tex->t2;
 419                 tv[3][0] = org[0] + right[0] - up[0];
 420                 tv[3][1] = org[1] + right[1] - up[1];
 421                 tv[3][2] = org[2] + right[2] - up[2];
 422                 tv[3][3] = tex->s2;
 423                 tv[3][4] = tex->t1;
 424
 425                 R_Mesh_Draw(&m);
 426
 427                 if (fog && (tex->s1 != texfog->s1 || tex->t1 != texfog->t1))
 428                 {
 429                         m.blendfunc2 = GL_ONE;
 430                         m.cr = fogcolor[0];
 431                         m.cg = fogcolor[1];
 432                         m.cb = fogcolor[2];
 433                         m.ca = r->color[3] * fog;
 434
 435                         tv[0][3] = texfog->s1;
 436                         tv[0][4] = texfog->t1;
 437                         tv[1][3] = texfog->s1;
 438                         tv[1][4] = texfog->t2;
 439                         tv[2][3] = texfog->s2;
 440                         tv[2][4] = texfog->t2;
 441                         tv[3][3] = texfog->s2;
 442                         tv[3][4] = texfog->t1;
 443
 444                         R_Mesh_Draw(&m);
 445                         m.blendfunc2 = GL_ONE_MINUS_SRC_ALPHA;
 446                 }
 447         }
 448 }