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 float TraceLine (vec3_t start, vec3_t end, vec3_t impact, vec3_t normal);
25 #define MAX_EXPLOSIONS 64
26 #define EXPLOSIONBANDS 16
27 #define EXPLOSIONSEGMENTS 16
28 #define EXPLOSIONVERTS ((EXPLOSIONBANDS+1)*(EXPLOSIONSEGMENTS+1))
29 #define EXPLOSIONTRIS (EXPLOSIONVERTS*2)
30 #define EXPLOSIONSTARTRADIUS (0.0f)
31 #define EXPLOSIONSTARTVELOCITY (400.0f)
32 #define EXPLOSIONFADESTART (1.5f)
33 #define EXPLOSIONFADERATE (6.0f)
35 vec3_t explosionspherevert[EXPLOSIONVERTS];
36 vec3_t explosionspherevertvel[EXPLOSIONVERTS];
37 float explosiontexcoords[EXPLOSIONVERTS][2];
38 int explosiontris[EXPLOSIONTRIS][3];
39 vec3_t explosionpoint[EXPLOSIONVERTS];
41 typedef struct explosion_s
44 vec3_t vert[EXPLOSIONVERTS];
45 vec3_t vertvel[EXPLOSIONVERTS];
49 explosion_t explosion[128];
52 int explosiontexturefog;
54 cvar_t r_explosionclip = {"r_explosionclip", "0"};
56 int R_ExplosionVert(int column, int row)
60 i = row * (EXPLOSIONSEGMENTS + 1) + column;
61 a = row * M_PI * 2 / EXPLOSIONBANDS;
62 b = column * M_PI * 2 / EXPLOSIONSEGMENTS;
64 explosionpoint[i][0] = cos(a) * c;
65 explosionpoint[i][1] = sin(a) * c;
66 explosionpoint[i][2] = -sin(b);
67 explosiontexcoords[i][0] = (float) column / (float) EXPLOSIONSEGMENTS;
68 explosiontexcoords[i][1] = (float) row / (float) EXPLOSIONBANDS;
72 void r_explosion_start()
75 byte noise1[128][128], noise2[128][128], data[128][128][4];
76 fractalnoise(&noise1[0][0], 128, 8);
77 fractalnoise(&noise2[0][0], 128, 8);
78 for (y = 0;y < 128;y++)
80 for (x = 0;x < 128;x++)
83 j = noise1[y][x] * 3 - 128;
88 data[y][x][0] = bound(0, r, 255);
89 data[y][x][1] = bound(0, g, 255);
90 data[y][x][2] = bound(0, b, 255);
91 data[y][x][3] = bound(0, a, 255);
94 explosiontexture = GL_LoadTexture ("explosiontexture", 128, 128, &data[0][0][0], true, true, 4);
95 for (y = 0;y < 128;y++)
96 for (x = 0;x < 128;x++)
97 data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
98 explosiontexturefog = GL_LoadTexture ("explosiontexturefog", 128, 128, &data[0][0][0], true, true, 4);
101 void r_explosion_shutdown()
105 void R_Explosion_Init()
109 for (y = 0;y < EXPLOSIONBANDS;y++)
111 for (x = 0;x < EXPLOSIONSEGMENTS;x++)
113 explosiontris[i][0] = R_ExplosionVert(x , y );
114 explosiontris[i][1] = R_ExplosionVert(x + 1, y );
115 explosiontris[i][2] = R_ExplosionVert(x , y + 1);
117 explosiontris[i][0] = R_ExplosionVert(x + 1, y );
118 explosiontris[i][1] = R_ExplosionVert(x + 1, y + 1);
119 explosiontris[i][2] = R_ExplosionVert(x , y + 1);
123 for (i = 0;i < EXPLOSIONVERTS;i++)
125 explosionspherevert[i][0] = explosionpoint[i][0] * EXPLOSIONSTARTRADIUS;
126 explosionspherevert[i][1] = explosionpoint[i][1] * EXPLOSIONSTARTRADIUS;
127 explosionspherevert[i][2] = explosionpoint[i][2] * EXPLOSIONSTARTRADIUS;
128 explosionspherevertvel[i][0] = explosionpoint[i][0] * EXPLOSIONSTARTVELOCITY;
129 explosionspherevertvel[i][1] = explosionpoint[i][1] * EXPLOSIONSTARTVELOCITY;
130 explosionspherevertvel[i][2] = explosionpoint[i][2] * EXPLOSIONSTARTVELOCITY;
133 Cvar_RegisterVariable(&r_explosionclip);
135 R_RegisterModule("R_Explosions", r_explosion_start, r_explosion_shutdown);
138 void R_NewExplosion(vec3_t org)
141 for (i = 0;i < MAX_EXPLOSIONS;i++)
143 if (explosion[i].alpha <= 0.0f)
145 explosion[i].alpha = EXPLOSIONFADESTART;
146 for (j = 0;j < EXPLOSIONVERTS;j++)
148 explosion[i].vert[j][0] = explosionspherevert[j][0] + org[0];
149 explosion[i].vert[j][1] = explosionspherevert[j][1] + org[1];
150 explosion[i].vert[j][2] = explosionspherevert[j][2] + org[2];
151 explosion[i].vertvel[j][0] = explosionspherevertvel[j][0];
152 explosion[i].vertvel[j][1] = explosionspherevertvel[j][1];
153 explosion[i].vertvel[j][2] = explosionspherevertvel[j][2];
160 void R_DrawExplosion(explosion_t *e)
162 int i, index, *indexlist = &explosiontris[0][0], alpha = bound(0, e->alpha * 255.0f, 255);
163 float s = cl.time * 1, t = cl.time * 0.75;
167 glColor4f(1,1,1,e->alpha);
168 glDisable(GL_TEXTURE_2D);
169 // glBindTexture(GL_TEXTURE_2D, explosiontexture);
170 if (gl_vertexarrays.value)
172 qglVertexPointer(3, GL_FLOAT, 0, (float *) &e->vert[0][0]);
173 // qglTexCoordPointer(2, GL_FLOAT, 0, (float *) &explosiontexcoords[0][0]);
174 glEnableClientState(GL_VERTEX_ARRAY);
175 // glEnableClientState(GL_TEXTURE_COORD_ARRAY);
176 qglDrawElements(GL_TRIANGLES, EXPLOSIONTRIS, GL_UNSIGNED_INT, indexlist);
177 // glDisableClientState(GL_TEXTURE_COORD_ARRAY);
178 glDisableClientState(GL_VERTEX_ARRAY);
182 glBegin(GL_TRIANGLES);
183 for (i = 0;i < EXPLOSIONTRIS * 3;i++)
185 index = *indexlist++;
186 // glTexCoord2fv(explosiontexcoords[index]);
187 glVertex3fv(e->vert[index]);
191 glEnable(GL_TEXTURE_2D);
193 for (i = 0;i < EXPLOSIONTRIS;i++)
195 transpolybegin(explosiontexture, 0, explosiontexturefog, TPOLYTYPE_ALPHA);
196 index = *indexlist++;transpolyvert(e->vert[index][0], e->vert[index][1], e->vert[index][2], explosiontexcoords[index][0] + s, explosiontexcoords[index][1] + t, 255, 255, 255, alpha);
197 index = *indexlist++;transpolyvert(e->vert[index][0], e->vert[index][1], e->vert[index][2], explosiontexcoords[index][0] + s, explosiontexcoords[index][1] + t, 255, 255, 255, alpha);
198 index = *indexlist++;transpolyvert(e->vert[index][0], e->vert[index][1], e->vert[index][2], explosiontexcoords[index][0] + s, explosiontexcoords[index][1] + t, 255, 255, 255, alpha);
203 void R_MoveExplosion(explosion_t *e, float frametime)
207 e->alpha -= frametime * EXPLOSIONFADERATE;
208 for (i = 0;i < EXPLOSIONVERTS;i++)
210 if (e->vertvel[i][0] || e->vertvel[i][1] || e->vertvel[i][2])
212 end[0] = e->vert[i][0] + frametime * e->vertvel[i][0];
213 end[1] = e->vert[i][1] + frametime * e->vertvel[i][1];
214 end[2] = e->vert[i][2] + frametime * e->vertvel[i][2];
215 if (r_explosionclip.value)
218 vec3_t impact, normal;
219 f = TraceLine(e->vert[i], end, impact, normal);
220 VectorCopy(impact, e->vert[i]);
223 // clip velocity against the wall
224 dot = -DotProduct(e->vertvel[i], normal);
225 e->vertvel[i][0] += normal[0] * dot;
226 e->vertvel[i][1] += normal[1] * dot;
227 e->vertvel[i][2] += normal[2] * dot;
232 VectorCopy(end, e->vert[i]);
238 void R_MoveExplosions()
242 frametime = cl.time - cl.oldtime;
243 for (i = 0;i < MAX_EXPLOSIONS;i++)
245 if (explosion[i].alpha > 0.0f)
247 R_MoveExplosion(&explosion[i], frametime);
252 void R_DrawExplosions()
255 for (i = 0;i < MAX_EXPLOSIONS;i++)
257 if (explosion[i].alpha > 0.0f)
259 R_DrawExplosion(&explosion[i]);