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 EXPLOSIONSTARTRADIUS (20.0f)
28 #define EXPLOSIONSTARTVELOCITY (256.0f)
29 #define EXPLOSIONRANDOMVELOCITY (64.0f)
30 #define EXPLOSIONFADESTART (1.5f)
31 #define EXPLOSIONFADERATE (4.5f)
33 #define MAX_EXPLOSIONGAS (MAX_EXPLOSIONS * EXPLOSIONGAS)
34 #define EXPLOSIONGAS 8
35 #define EXPLOSIONGASSTARTRADIUS (15.0f)
36 #define EXPLOSIONGASSTARTVELOCITY (50.0f)
37 #define GASDENSITY_SCALER (32768.0f / EXPLOSIONGAS)
38 #define GASFADERATE (GASDENSITY_SCALER * EXPLOSIONGAS * 2)
40 typedef struct explosiongas_s
48 explosiongas_t explosiongas[MAX_EXPLOSIONGAS];
51 vec3_t explosionspherevert[EXPLOSIONVERTS];
52 vec3_t explosionspherevertvel[EXPLOSIONVERTS];
53 float explosiontexcoords[EXPLOSIONVERTS][2];
54 int explosiontris[EXPLOSIONTRIS][3];
55 int explosionnoiseindex[EXPLOSIONVERTS];
56 vec3_t explosionpoint[EXPLOSIONVERTS];
58 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 byte 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 explosionnoiseindex[i] = (row % EXPLOSIONGRID) * EXPLOSIONGRID + (column % EXPLOSIONGRID);
132 explosiontexcoords[i][0] = (float) column / (float) EXPLOSIONGRID;
133 explosiontexcoords[i][1] = (float) row / (float) EXPLOSIONGRID;
137 void R_Explosion_Init(void)
141 for (y = 0;y < EXPLOSIONGRID;y++)
143 for (x = 0;x < EXPLOSIONGRID;x++)
145 explosiontris[i][0] = R_ExplosionVert(x , y );
146 explosiontris[i][1] = R_ExplosionVert(x + 1, y );
147 explosiontris[i][2] = R_ExplosionVert(x , y + 1);
149 explosiontris[i][0] = R_ExplosionVert(x + 1, y );
150 explosiontris[i][1] = R_ExplosionVert(x + 1, y + 1);
151 explosiontris[i][2] = R_ExplosionVert(x , y + 1);
155 for (i = 0;i < EXPLOSIONVERTS;i++)
157 explosionspherevert[i][0] = explosionpoint[i][0] * EXPLOSIONSTARTRADIUS;
158 explosionspherevert[i][1] = explosionpoint[i][1] * EXPLOSIONSTARTRADIUS;
159 explosionspherevert[i][2] = explosionpoint[i][2] * EXPLOSIONSTARTRADIUS;
160 explosionspherevertvel[i][0] = explosionpoint[i][0] * EXPLOSIONSTARTVELOCITY;
161 explosionspherevertvel[i][1] = explosionpoint[i][1] * EXPLOSIONSTARTVELOCITY;
162 explosionspherevertvel[i][2] = explosionpoint[i][2] * EXPLOSIONSTARTVELOCITY;
165 Cvar_RegisterVariable(&r_explosionclip);
166 Cvar_RegisterVariable(&r_drawexplosions);
168 R_RegisterModule("R_Explosions", r_explosion_start, r_explosion_shutdown, r_explosion_newmap);
171 void R_NewExplosion(vec3_t org)
174 float dist, v[3], normal[3];
175 byte noise[4][EXPLOSIONGRID*EXPLOSIONGRID];
176 fractalnoise(noise[0], EXPLOSIONGRID, 4);
177 fractalnoise(noise[1], EXPLOSIONGRID, 2);
178 fractalnoise(noise[2], EXPLOSIONGRID, 2);
179 fractalnoise(noise[3], EXPLOSIONGRID, 2);
180 for (i = 0;i < MAX_EXPLOSIONS;i++)
182 if (explosion[i].alpha <= 0.0f)
184 explosion[i].alpha = EXPLOSIONFADESTART;
185 for (j = 0;j < EXPLOSIONVERTS;j++)
187 dist = noise[3][explosionnoiseindex[j]] * (1.0f / 256.0f) + 0.5;
188 VectorMA(org, dist, explosionspherevert[j], v);
189 TraceLine(org, v, explosion[i].vert[j], normal, 0);
190 VectorAdd(explosion[i].vert[j], normal, explosion[i].vert[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);
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], fog, ifog, alpha;
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]);
245 m.colorstep = sizeof(float[4]);
246 for (i = 0;i < EXPLOSIONVERTS;i++)
248 // use inverse fog alpha as color
249 VectorSubtract(e->vert[i], r_origin, diff);
250 ifog = 1 - exp(fogdensity/DotProduct(diff,diff));
259 m.tex[0] = R_GetTexture(explosiontexture);
260 m.texcoords[0] = &explosiontexcoords[0][0];
261 m.texcoordstep[0] = sizeof(float[2]);
267 m.blendfunc1 = GL_SRC_ALPHA;
268 m.blendfunc2 = GL_ONE;
269 for (i = 0;i < EXPLOSIONVERTS;i++)
271 VectorSubtract(e->vert[i], r_origin, diff);
272 fog = exp(fogdensity/DotProduct(diff,diff));
273 c[i][0] = fogcolor[0];
274 c[i][1] = fogcolor[1];
275 c[i][2] = fogcolor[2];
276 c[i][3] = alpha * fog;
278 //m.color = &c[0][0];
279 //m.colorstep = sizeof(float[4]);
280 m.tex[0] = R_GetTexture(explosiontexturefog);
285 void R_MoveExplosion(explosion_t *e, /*explosiongas_t **list, explosiongas_t **listend, */float frametime)
288 float f, dot, frictionscale, end[3], impact[3], normal[3];
294 e->alpha -= frametime * EXPLOSIONFADERATE;
295 frictionscale = 1 - frametime;
296 frictionscale = bound(0, frictionscale, 1);
297 for (i = 0;i < EXPLOSIONVERTS;i++)
299 if (e->vertvel[i][0] || e->vertvel[i][1] || e->vertvel[i][2])
301 end[0] = e->vert[i][0] + frametime * e->vertvel[i][0];
302 end[1] = e->vert[i][1] + frametime * e->vertvel[i][1];
303 end[2] = e->vert[i][2] + frametime * e->vertvel[i][2];
304 if (r_explosionclip.integer)
306 f = TraceLine(e->vert[i], end, impact, normal, 0);
307 VectorCopy(impact, e->vert[i]);
310 // clip velocity against the wall
311 dot = DotProduct(e->vertvel[i], normal) * 1.125f;
312 e->vertvel[i][0] -= normal[0] * dot;
313 e->vertvel[i][1] -= normal[1] * dot;
314 e->vertvel[i][2] -= normal[2] * dot;
319 VectorCopy(end, e->vert[i]);
321 e->vertvel[i][2] += sv_gravity.value * frametime * -0.25f;
322 VectorScale(e->vertvel[i], frictionscale, e->vertvel[i]);
325 for (l = list;l < listend;l++)
327 VectorSubtract(e->vert[i], (*l)->origin, diff);
328 dist = DotProduct(diff, diff);
329 if (dist < 4096 && dist >= 1)
331 dist = (*l)->pressure * frametime / dist;
332 VectorMA(e->vertvel[i], dist, diff, e->vertvel[i]);
340 void R_MoveExplosionGas(explosiongas_t *e, explosiongas_t **list, explosiongas_t **listend, float frametime)
343 vec_t dist, frictionscale;
345 frictionscale = 1 - frametime;
346 frictionscale = bound(0, frictionscale, 1);
347 if (e->velocity[0] || e->velocity[1] || e->velocity[2])
349 end[0] = e->origin[0] + frametime * e->velocity[0];
350 end[1] = e->origin[1] + frametime * e->velocity[1];
351 end[2] = e->origin[2] + frametime * e->velocity[2];
352 if (r_explosionclip.integer)
355 vec3_t impact, normal;
356 f = TraceLine(e->origin, end, impact, normal, 0);
357 VectorCopy(impact, e->origin);
360 // clip velocity against the wall
361 dot = DotProduct(e->velocity, normal) * -1.3f;
362 e->velocity[0] += normal[0] * dot;
363 e->velocity[1] += normal[1] * dot;
364 e->velocity[2] += normal[2] * dot;
369 VectorCopy(end, e->origin);
371 e->velocity[2] += sv_gravity.value * frametime;
372 VectorScale(e->velocity, frictionscale, e->velocity);
374 for (l = list;l < listend;l++)
378 VectorSubtract(e->origin, (*l)->origin, diff);
379 dist = DotProduct(diff, diff);
380 if (dist < 4096 && dist >= 1)
382 dist = (*l)->pressure * frametime / dist;
383 VectorMA(e->velocity, dist, diff, e->velocity);
390 void R_MoveExplosions(void)
394 // explosiongas_t *gaslist[MAX_EXPLOSIONGAS], **l, **end;
395 frametime = cl.time - cl.oldtime;
398 for (i = 0;i < MAX_EXPLOSIONGAS;i++)
400 if (explosiongas[i].pressure > 0)
402 explosiongas[i].pressure -= frametime * GASFADERATE;
403 if (explosiongas[i].pressure > 0)
404 *l++ = &explosiongas[i];
408 for (l = gaslist;l < end;l++)
409 R_MoveExplosionGas(*l, gaslist, end, frametime);
412 for (i = 0;i < MAX_EXPLOSIONS;i++)
414 if (explosion[i].alpha > 0.0f)
416 if (explosion[i].starttime > cl.time)
418 explosion[i].alpha = 0;
421 R_MoveExplosion(&explosion[i], /*gaslist, end, */frametime);
426 void R_DrawExplosions(void)
429 if (!r_drawexplosions.integer)
431 for (i = 0;i < MAX_EXPLOSIONS;i++)
433 if (explosion[i].alpha > 0.0f)
435 R_DrawExplosion(&explosion[i]);