2 Copyright (C) 1996-1997 Id Software, Inc.
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.
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.
13 See the GNU General Public License for more details.
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.
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 (256.0f)
28 //#define EXPLOSIONSTARTVELOCITY (384.0f)
29 //#define EXPLOSIONRANDOMVELOCITY (32.0f)
30 #define EXPLOSIONFADESTART (1.5f)
31 //#define EXPLOSIONFADERATE (4.5f)
32 #define EXPLOSIONFADERATE (3.0f)
34 #define MAX_EXPLOSIONGAS (MAX_EXPLOSIONS * EXPLOSIONGAS)
35 #define EXPLOSIONGAS 8
36 #define EXPLOSIONGASSTARTRADIUS (15.0f)
37 #define EXPLOSIONGASSTARTVELOCITY (50.0f)
38 #define GASDENSITY_SCALER (32768.0f / EXPLOSIONGAS)
39 #define GASFADERATE (GASDENSITY_SCALER * EXPLOSIONGAS * 2)
41 typedef struct explosiongas_s
49 explosiongas_t explosiongas[MAX_EXPLOSIONGAS];
52 float explosiontexcoords[EXPLOSIONVERTS][2];
53 int explosiontris[EXPLOSIONTRIS][3];
54 int explosionnoiseindex[EXPLOSIONVERTS];
55 vec3_t explosionpoint[EXPLOSIONVERTS];
56 vec3_t explosionspherevertvel[EXPLOSIONVERTS];
58 typedef struct explosion_s
64 vec3_t vert[EXPLOSIONVERTS];
65 vec3_t vertvel[EXPLOSIONVERTS];
69 explosion_t explosion[MAX_EXPLOSIONS];
71 rtexture_t *explosiontexture;
72 rtexture_t *explosiontexturefog;
74 rtexturepool_t *explosiontexturepool;
76 cvar_t r_explosionclip = {CVAR_SAVE, "r_explosionclip", "1"};
77 cvar_t r_drawexplosions = {0, "r_drawexplosions", "1"};
79 void r_explosion_start(void)
82 qbyte noise1[128][128], noise2[128][128], noise3[128][128], data[128][128][4];
83 explosiontexturepool = R_AllocTexturePool();
84 fractalnoise(&noise1[0][0], 128, 32);
85 fractalnoise(&noise2[0][0], 128, 4);
86 fractalnoise(&noise3[0][0], 128, 4);
87 for (y = 0;y < 128;y++)
89 for (x = 0;x < 128;x++)
92 j = (noise1[y][x] * noise2[y][x]) * 3 / 256 - 128;
96 a = noise3[y][x] * 3 - 128;
97 data[y][x][0] = bound(0, r, 255);
98 data[y][x][1] = bound(0, g, 255);
99 data[y][x][2] = bound(0, b, 255);
100 data[y][x][3] = bound(0, a, 255);
103 explosiontexture = R_LoadTexture (explosiontexturepool, "explosiontexture", 128, 128, &data[0][0][0], TEXTYPE_RGBA, TEXF_MIPMAP | TEXF_ALPHA | TEXF_PRECACHE);
104 for (y = 0;y < 128;y++)
105 for (x = 0;x < 128;x++)
106 data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
107 explosiontexturefog = R_LoadTexture (explosiontexturepool, "explosiontexturefog", 128, 128, &data[0][0][0], TEXTYPE_RGBA, TEXF_MIPMAP | TEXF_ALPHA | TEXF_PRECACHE);
108 // note that explosions survive the restart
111 void r_explosion_shutdown(void)
113 R_FreeTexturePool(&explosiontexturepool);
116 void r_explosion_newmap(void)
118 memset(explosion, 0, sizeof(explosion));
119 // memset(explosiongas, 0, sizeof(explosiongas));
122 int R_ExplosionVert(int column, int row)
126 i = row * (EXPLOSIONGRID + 1) + column;
127 a = row * M_PI * 2 / EXPLOSIONGRID;
128 b = column * M_PI * 2 / EXPLOSIONGRID;
130 explosionpoint[i][0] = cos(a) * c;
131 explosionpoint[i][1] = sin(a) * c;
132 explosionpoint[i][2] = -sin(b);
133 explosionspherevertvel[i][0] = explosionpoint[i][0] * EXPLOSIONSTARTVELOCITY;
134 explosionspherevertvel[i][1] = explosionpoint[i][1] * EXPLOSIONSTARTVELOCITY;
135 explosionspherevertvel[i][2] = explosionpoint[i][2] * EXPLOSIONSTARTVELOCITY;
136 explosiontexcoords[i][0] = (float) column / (float) EXPLOSIONGRID;
137 explosiontexcoords[i][1] = (float) row / (float) EXPLOSIONGRID;
138 // top and bottom rows are all one position...
139 if (row == 0 || row == EXPLOSIONGRID)
141 explosionnoiseindex[i] = (row % EXPLOSIONGRID) * EXPLOSIONGRID + (column % EXPLOSIONGRID);
145 void R_Explosion_Init(void)
149 for (y = 0;y < EXPLOSIONGRID;y++)
151 for (x = 0;x < EXPLOSIONGRID;x++)
153 explosiontris[i][0] = R_ExplosionVert(x , y );
154 explosiontris[i][1] = R_ExplosionVert(x + 1, y );
155 explosiontris[i][2] = R_ExplosionVert(x , y + 1);
157 explosiontris[i][0] = R_ExplosionVert(x + 1, y );
158 explosiontris[i][1] = R_ExplosionVert(x + 1, y + 1);
159 explosiontris[i][2] = R_ExplosionVert(x , y + 1);
164 Cvar_RegisterVariable(&r_explosionclip);
165 Cvar_RegisterVariable(&r_drawexplosions);
167 R_RegisterModule("R_Explosions", r_explosion_start, r_explosion_shutdown, r_explosion_newmap);
170 void R_NewExplosion(vec3_t org)
174 qbyte noise[EXPLOSIONGRID*EXPLOSIONGRID];
175 fractalnoisequick(noise, EXPLOSIONGRID, 4); // adjust noise grid size according to explosion
176 for (i = 0;i < MAX_EXPLOSIONS;i++)
178 if (explosion[i].alpha <= 0.01f)
180 explosion[i].starttime = cl.time;
181 explosion[i].time = explosion[i].starttime - 0.1;
182 explosion[i].alpha = EXPLOSIONFADESTART;
183 VectorCopy(org, explosion[i].origin);
184 for (j = 0;j < EXPLOSIONVERTS;j++)
187 VectorCopy(explosion[i].origin, explosion[i].vert[j]);
188 // calculate velocity
189 dist = noise[explosionnoiseindex[j]] * (1.0f / 255.0f) + 0.5;
190 VectorScale(explosionspherevertvel[j], dist, explosion[i].vertvel[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));
202 while (i < MAX_EXPLOSIONGAS && j > 0)
204 while (explosiongas[i].pressure > 0)
207 if (i >= MAX_EXPLOSIONGAS)
211 VectorMA(org, EXPLOSIONGASSTARTRADIUS, v, v);
212 TraceLine(org, v, explosiongas[i].origin, NULL, 0, true);
214 VectorScale(v, EXPLOSIONGASSTARTVELOCITY, explosiongas[i].velocity);
215 explosiongas[i].pressure = j * GASDENSITY_SCALER;
221 void R_DrawExplosion(explosion_t *e)
224 float c[EXPLOSIONVERTS][4], diff[3], centerdir[3], /*fog, */ifog, alpha, dist/*, centerdist, size, scale*/;
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]);
243 m.colorstep = sizeof(float[4]);
244 VectorSubtract(r_origin, e->origin, centerdir);
245 VectorNormalizeFast(centerdir);
247 centerdist = DotProduct(e->origin, centerdir);
249 for (i = 0;i < EXPLOSIONVERTS;i++)
251 dist = DotProduct(e->vert[i], centerdir) - centerdist;
259 for (i = 0;i < EXPLOSIONVERTS;i++)
261 //dist = (DotProduct(e->vert[i], centerdir) - centerdist) * scale - 2.0f;
262 VectorSubtract(e->vert[i], e->origin, diff);
263 VectorNormalizeFast(diff);
264 dist = (DotProduct(diff, centerdir) * 6.0f - 4.0f) * alpha;
267 // use inverse fog alpha
268 VectorSubtract(e->vert[i], r_origin, diff);
269 ifog = 1 - exp(fogdensity/DotProduct(diff,diff));
276 c[i][0] = c[i][1] = c[i][2] = dist;
282 for (i = 0;i < EXPLOSIONVERTS;i++)
284 //dist = (DotProduct(e->vert[i], centerdir) - centerdist) * scale - 2.0f;
285 VectorSubtract(e->vert[i], e->origin, diff);
286 VectorNormalizeFast(diff);
287 dist = (DotProduct(diff, centerdir) * 6.0f - 4.0f) * alpha;
290 c[i][0] = c[i][1] = c[i][2] = dist;
298 m.colorstep = sizeof(float[4]);
299 for (i = 0;i < EXPLOSIONVERTS;i++)
301 // use inverse fog alpha as color
302 VectorSubtract(e->vert[i], r_origin, diff);
303 ifog = 1 - exp(fogdensity/DotProduct(diff,diff));
313 m.tex[0] = R_GetTexture(explosiontexture);
314 m.texcoords[0] = &explosiontexcoords[0][0];
315 m.texcoordstep[0] = sizeof(float[2]);
322 m.blendfunc1 = GL_SRC_ALPHA;
323 m.blendfunc2 = GL_ONE;
324 for (i = 0;i < EXPLOSIONVERTS;i++)
326 VectorSubtract(e->vert[i], r_origin, diff);
327 fog = exp(fogdensity/DotProduct(diff,diff));
328 c[i][0] = fogcolor[0];
329 c[i][1] = fogcolor[1];
330 c[i][2] = fogcolor[2];
331 c[i][3] = alpha * fog;
333 //m.color = &c[0][0];
334 //m.colorstep = sizeof(float[4]);
335 m.tex[0] = R_GetTexture(explosiontexturefog);
341 void R_MoveExplosion(explosion_t *e/*, explosiongas_t **list, explosiongas_t **listend, */)
344 float dot, frictionscale, end[3], impact[3], normal[3], frametime;
350 frametime = cl.time - e->time;
352 e->alpha = EXPLOSIONFADESTART - (cl.time - e->starttime) * EXPLOSIONFADERATE;
353 if (e->alpha <= 0.01f)
358 frictionscale = 1 - frametime;
359 frictionscale = bound(0, frictionscale, 1);
360 for (i = 0;i < EXPLOSIONVERTS;i++)
362 if (e->vertvel[i][0] || e->vertvel[i][1] || e->vertvel[i][2])
364 //e->vertvel[i][2] += sv_gravity.value * frametime * -0.25f;
365 VectorScale(e->vertvel[i], frictionscale, e->vertvel[i]);
366 VectorMA(e->vert[i], frametime, e->vertvel[i], end);
367 if (r_explosionclip.integer)
369 if (TraceLine(e->vert[i], end, impact, normal, 0, true) < 1)
371 // clip velocity against the wall
372 dot = DotProduct(e->vertvel[i], normal) * -1.125f;
373 VectorMA(e->vertvel[i], dot, normal, e->vertvel[i]);
375 VectorCopy(impact, e->vert[i]);
378 VectorCopy(end, e->vert[i]);
381 for (l = list;l < listend;l++)
383 VectorSubtract(e->vert[i], (*l)->origin, diff);
384 dist = DotProduct(diff, diff);
385 if (dist < 4096 && dist >= 1)
387 dist = (*l)->pressure * frametime / dist;
388 VectorMA(e->vertvel[i], dist, diff, e->vertvel[i]);
393 for (i = 0;i < EXPLOSIONGRID;i++)
394 VectorCopy(e->vert[i * (EXPLOSIONGRID + 1)], e->vert[i * (EXPLOSIONGRID + 1) + EXPLOSIONGRID]);
395 memcpy(e->vert[EXPLOSIONGRID * (EXPLOSIONGRID + 1)], e->vert[0], sizeof(float[3]) * (EXPLOSIONGRID + 1));
399 void R_MoveExplosionGas(explosiongas_t *e, explosiongas_t **list, explosiongas_t **listend, float frametime)
402 vec_t dist, frictionscale;
404 frictionscale = 1 - frametime;
405 frictionscale = bound(0, frictionscale, 1);
406 if (e->velocity[0] || e->velocity[1] || e->velocity[2])
408 end[0] = e->origin[0] + frametime * e->velocity[0];
409 end[1] = e->origin[1] + frametime * e->velocity[1];
410 end[2] = e->origin[2] + frametime * e->velocity[2];
411 if (r_explosionclip.integer)
414 vec3_t impact, normal;
415 f = TraceLine(e->origin, end, impact, normal, 0, true);
416 VectorCopy(impact, e->origin);
419 // clip velocity against the wall
420 dot = DotProduct(e->velocity, normal) * -1.3f;
421 e->velocity[0] += normal[0] * dot;
422 e->velocity[1] += normal[1] * dot;
423 e->velocity[2] += normal[2] * dot;
428 VectorCopy(end, e->origin);
430 e->velocity[2] += sv_gravity.value * frametime;
431 VectorScale(e->velocity, frictionscale, e->velocity);
433 for (l = list;l < listend;l++)
437 VectorSubtract(e->origin, (*l)->origin, diff);
438 dist = DotProduct(diff, diff);
439 if (dist < 4096 && dist >= 1)
441 dist = (*l)->pressure * frametime / dist;
442 VectorMA(e->velocity, dist, diff, e->velocity);
449 void R_MoveExplosions(void)
453 // explosiongas_t *gaslist[MAX_EXPLOSIONGAS], **l, **end;
454 frametime = cl.time - cl.oldtime;
457 for (i = 0;i < MAX_EXPLOSIONGAS;i++)
459 if (explosiongas[i].pressure > 0)
461 explosiongas[i].pressure -= frametime * GASFADERATE;
462 if (explosiongas[i].pressure > 0)
463 *l++ = &explosiongas[i];
467 for (l = gaslist;l < end;l++)
468 R_MoveExplosionGas(*l, gaslist, end, frametime);
471 for (i = 0;i < MAX_EXPLOSIONS;i++)
472 if (explosion[i].alpha > 0.01f)
473 R_MoveExplosion(&explosion[i]/*, gaslist, end, */);
476 void R_DrawExplosions(void)
479 if (!r_drawexplosions.integer)
481 for (i = 0;i < MAX_EXPLOSIONS;i++)
482 if (explosion[i].alpha > 0.01f)
483 R_DrawExplosion(&explosion[i]);