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 (384.0f)
28 //#define EXPLOSIONRANDOMVELOCITY (32.0f)
29 #define EXPLOSIONFADESTART (1.5f)
30 #define EXPLOSIONFADERATE (4.5f)
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)
39 typedef struct explosiongas_s
47 explosiongas_t explosiongas[MAX_EXPLOSIONGAS];
50 float explosiontexcoords[EXPLOSIONVERTS][2];
51 int explosiontris[EXPLOSIONTRIS][3];
52 int explosionnoiseindex[EXPLOSIONVERTS];
53 vec3_t explosionpoint[EXPLOSIONVERTS];
54 vec3_t explosionspherevertvel[EXPLOSIONVERTS];
56 typedef struct explosion_s
62 vec3_t vert[EXPLOSIONVERTS];
63 vec3_t vertvel[EXPLOSIONVERTS];
67 explosion_t explosion[MAX_EXPLOSIONS];
69 rtexture_t *explosiontexture;
70 rtexture_t *explosiontexturefog;
72 rtexturepool_t *explosiontexturepool;
74 cvar_t r_explosionclip = {CVAR_SAVE, "r_explosionclip", "1"};
75 cvar_t r_drawexplosions = {0, "r_drawexplosions", "1"};
77 void r_explosion_start(void)
80 qbyte 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++)
87 for (x = 0;x < 128;x++)
90 j = (noise1[y][x] * noise2[y][x]) * 3 / 256 - 128;
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);
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
109 void r_explosion_shutdown(void)
111 R_FreeTexturePool(&explosiontexturepool);
114 void r_explosion_newmap(void)
116 memset(explosion, 0, sizeof(explosion));
117 // memset(explosiongas, 0, sizeof(explosiongas));
120 int R_ExplosionVert(int column, int row)
124 i = row * (EXPLOSIONGRID + 1) + column;
125 a = row * M_PI * 2 / EXPLOSIONGRID;
126 b = column * M_PI * 2 / EXPLOSIONGRID;
128 explosionpoint[i][0] = cos(a) * c;
129 explosionpoint[i][1] = sin(a) * c;
130 explosionpoint[i][2] = -sin(b);
131 explosionspherevertvel[i][0] = explosionpoint[i][0] * EXPLOSIONSTARTVELOCITY;
132 explosionspherevertvel[i][1] = explosionpoint[i][1] * EXPLOSIONSTARTVELOCITY;
133 explosionspherevertvel[i][2] = explosionpoint[i][2] * EXPLOSIONSTARTVELOCITY;
134 explosiontexcoords[i][0] = (float) column / (float) EXPLOSIONGRID;
135 explosiontexcoords[i][1] = (float) row / (float) EXPLOSIONGRID;
136 // top and bottom rows are all one position...
137 if (row == 0 || row == EXPLOSIONGRID)
139 explosionnoiseindex[i] = (row % EXPLOSIONGRID) * EXPLOSIONGRID + (column % EXPLOSIONGRID);
143 void R_Explosion_Init(void)
147 for (y = 0;y < EXPLOSIONGRID;y++)
149 for (x = 0;x < EXPLOSIONGRID;x++)
151 explosiontris[i][0] = R_ExplosionVert(x , y );
152 explosiontris[i][1] = R_ExplosionVert(x + 1, y );
153 explosiontris[i][2] = R_ExplosionVert(x , y + 1);
155 explosiontris[i][0] = R_ExplosionVert(x + 1, y );
156 explosiontris[i][1] = R_ExplosionVert(x + 1, y + 1);
157 explosiontris[i][2] = R_ExplosionVert(x , y + 1);
162 Cvar_RegisterVariable(&r_explosionclip);
163 Cvar_RegisterVariable(&r_drawexplosions);
165 R_RegisterModule("R_Explosions", r_explosion_start, r_explosion_shutdown, r_explosion_newmap);
168 void R_NewExplosion(vec3_t org)
172 qbyte noise[EXPLOSIONGRID*EXPLOSIONGRID];
173 fractalnoisequick(noise, EXPLOSIONGRID, 4);
174 for (i = 0;i < MAX_EXPLOSIONS;i++)
176 if (explosion[i].alpha <= 0.01f)
178 explosion[i].starttime = cl.time;
179 explosion[i].time = explosion[i].starttime - 0.1;
180 explosion[i].alpha = EXPLOSIONFADESTART;
181 VectorCopy(org, explosion[i].origin);
182 for (j = 0;j < EXPLOSIONVERTS;j++)
185 VectorCopy(explosion[i].origin, explosion[i].vert[j]);
186 // calculate velocity
187 dist = noise[explosionnoiseindex[j]] * (1.0f / 255.0f) + 0.5;
188 VectorScale(explosionspherevertvel[j], dist, explosion[i].vertvel[j]);
189 //explosion[i].vertvel[j][0] = explosionspherevertvel[j][0] * dist; + (((float) noise[0][explosionnoiseindex[j]] - 128.0f) * (EXPLOSIONRANDOMVELOCITY / 128.0f));
190 //explosion[i].vertvel[j][1] = explosionspherevertvel[j][1] * dist; + (((float) noise[1][explosionnoiseindex[j]] - 128.0f) * (EXPLOSIONRANDOMVELOCITY / 128.0f));
191 //explosion[i].vertvel[j][2] = explosionspherevertvel[j][2] * dist; + (((float) noise[2][explosionnoiseindex[j]] - 128.0f) * (EXPLOSIONRANDOMVELOCITY / 128.0f));
200 while (i < MAX_EXPLOSIONGAS && j > 0)
202 while (explosiongas[i].pressure > 0)
205 if (i >= MAX_EXPLOSIONGAS)
209 VectorMA(org, EXPLOSIONGASSTARTRADIUS, v, v);
210 TraceLine(org, v, explosiongas[i].origin, NULL, 0, true);
212 VectorScale(v, EXPLOSIONGASSTARTVELOCITY, explosiongas[i].velocity);
213 explosiongas[i].pressure = j * GASDENSITY_SCALER;
219 void R_DrawExplosion(explosion_t *e)
222 float c[EXPLOSIONVERTS][4], diff[3], /*fog, */ifog, alpha, dist, centerdist, size, scale;
224 memset(&m, 0, sizeof(m));
225 m.transparent = true;
226 m.blendfunc1 = GL_SRC_ALPHA;
227 m.blendfunc2 = GL_ONE; //_MINUS_SRC_ALPHA;
228 m.numtriangles = EXPLOSIONTRIS;
229 m.index = &explosiontris[0][0];
230 m.numverts = EXPLOSIONVERTS;
231 m.vertex = &e->vert[0][0];
232 m.vertexstep = sizeof(float[3]);
241 m.colorstep = sizeof(float[4]);
242 centerdist = DotProduct(e->origin, vpn);
244 for (i = 0;i < EXPLOSIONVERTS;i++)
246 dist = DotProduct(e->vert[i], vpn) - centerdist;
253 for (i = 0;i < EXPLOSIONVERTS;i++)
255 dist = (DotProduct(e->vert[i], vpn) - centerdist) * scale;
258 // use inverse fog alpha as color
259 VectorSubtract(e->vert[i], r_origin, diff);
260 ifog = 1 - exp(fogdensity/DotProduct(diff,diff));
263 c[i][0] = c[i][1] = c[i][2] = dist * alpha * ifog;
266 c[i][0] = c[i][1] = c[i][2] = 0;
272 for (i = 0;i < EXPLOSIONVERTS;i++)
274 dist = (DotProduct(e->vert[i], vpn) - centerdist) * scale;
276 c[i][0] = c[i][1] = c[i][2] = dist * alpha;
278 c[i][0] = c[i][1] = c[i][2] = 0;
286 m.colorstep = sizeof(float[4]);
287 for (i = 0;i < EXPLOSIONVERTS;i++)
289 // use inverse fog alpha as color
290 VectorSubtract(e->vert[i], r_origin, diff);
291 ifog = 1 - exp(fogdensity/DotProduct(diff,diff));
301 m.tex[0] = R_GetTexture(explosiontexture);
302 m.texcoords[0] = &explosiontexcoords[0][0];
303 m.texcoordstep[0] = sizeof(float[2]);
310 m.blendfunc1 = GL_SRC_ALPHA;
311 m.blendfunc2 = GL_ONE;
312 for (i = 0;i < EXPLOSIONVERTS;i++)
314 VectorSubtract(e->vert[i], r_origin, diff);
315 fog = exp(fogdensity/DotProduct(diff,diff));
316 c[i][0] = fogcolor[0];
317 c[i][1] = fogcolor[1];
318 c[i][2] = fogcolor[2];
319 c[i][3] = alpha * fog;
321 //m.color = &c[0][0];
322 //m.colorstep = sizeof(float[4]);
323 m.tex[0] = R_GetTexture(explosiontexturefog);
329 void R_MoveExplosion(explosion_t *e/*, explosiongas_t **list, explosiongas_t **listend, */)
332 float dot, frictionscale, end[3], impact[3], normal[3], frametime;
338 frametime = cl.time - e->time;
340 e->alpha = EXPLOSIONFADESTART - (cl.time - e->starttime) * EXPLOSIONFADERATE;
341 if (e->alpha <= 0.01f)
346 frictionscale = 1 - frametime;
347 frictionscale = bound(0, frictionscale, 1);
348 for (i = 0;i < EXPLOSIONVERTS;i++)
350 if (e->vertvel[i][0] || e->vertvel[i][1] || e->vertvel[i][2])
352 //e->vertvel[i][2] += sv_gravity.value * frametime * -0.25f;
353 VectorScale(e->vertvel[i], frictionscale, e->vertvel[i]);
354 VectorMA(e->vert[i], frametime, e->vertvel[i], end);
355 if (r_explosionclip.integer)
357 if (TraceLine(e->vert[i], end, impact, normal, 0, true) < 1)
359 // clip velocity against the wall
360 dot = DotProduct(e->vertvel[i], normal) * -1.125f;
361 VectorMA(e->vertvel[i], dot, normal, e->vertvel[i]);
363 VectorCopy(impact, e->vert[i]);
366 VectorCopy(end, e->vert[i]);
369 for (l = list;l < listend;l++)
371 VectorSubtract(e->vert[i], (*l)->origin, diff);
372 dist = DotProduct(diff, diff);
373 if (dist < 4096 && dist >= 1)
375 dist = (*l)->pressure * frametime / dist;
376 VectorMA(e->vertvel[i], dist, diff, e->vertvel[i]);
381 for (i = 0;i < EXPLOSIONGRID;i++)
382 VectorCopy(e->vert[i * (EXPLOSIONGRID + 1)], e->vert[i * (EXPLOSIONGRID + 1) + EXPLOSIONGRID]);
383 memcpy(e->vert[EXPLOSIONGRID * (EXPLOSIONGRID + 1)], e->vert[0], sizeof(float[3]) * (EXPLOSIONGRID + 1));
387 void R_MoveExplosionGas(explosiongas_t *e, explosiongas_t **list, explosiongas_t **listend, float frametime)
390 vec_t dist, frictionscale;
392 frictionscale = 1 - frametime;
393 frictionscale = bound(0, frictionscale, 1);
394 if (e->velocity[0] || e->velocity[1] || e->velocity[2])
396 end[0] = e->origin[0] + frametime * e->velocity[0];
397 end[1] = e->origin[1] + frametime * e->velocity[1];
398 end[2] = e->origin[2] + frametime * e->velocity[2];
399 if (r_explosionclip.integer)
402 vec3_t impact, normal;
403 f = TraceLine(e->origin, end, impact, normal, 0, true);
404 VectorCopy(impact, e->origin);
407 // clip velocity against the wall
408 dot = DotProduct(e->velocity, normal) * -1.3f;
409 e->velocity[0] += normal[0] * dot;
410 e->velocity[1] += normal[1] * dot;
411 e->velocity[2] += normal[2] * dot;
416 VectorCopy(end, e->origin);
418 e->velocity[2] += sv_gravity.value * frametime;
419 VectorScale(e->velocity, frictionscale, e->velocity);
421 for (l = list;l < listend;l++)
425 VectorSubtract(e->origin, (*l)->origin, diff);
426 dist = DotProduct(diff, diff);
427 if (dist < 4096 && dist >= 1)
429 dist = (*l)->pressure * frametime / dist;
430 VectorMA(e->velocity, dist, diff, e->velocity);
437 void R_MoveExplosions(void)
441 // explosiongas_t *gaslist[MAX_EXPLOSIONGAS], **l, **end;
442 frametime = cl.time - cl.oldtime;
445 for (i = 0;i < MAX_EXPLOSIONGAS;i++)
447 if (explosiongas[i].pressure > 0)
449 explosiongas[i].pressure -= frametime * GASFADERATE;
450 if (explosiongas[i].pressure > 0)
451 *l++ = &explosiongas[i];
455 for (l = gaslist;l < end;l++)
456 R_MoveExplosionGas(*l, gaslist, end, frametime);
459 for (i = 0;i < MAX_EXPLOSIONS;i++)
460 if (explosion[i].alpha > 0.01f)
461 R_MoveExplosion(&explosion[i]/*, gaslist, end, */);
464 void R_DrawExplosions(void)
467 if (!r_drawexplosions.integer)
469 for (i = 0;i < MAX_EXPLOSIONS;i++)
470 if (explosion[i].alpha > 0.01f)
471 R_DrawExplosion(&explosion[i]);