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.
22 #include "cl_collision.h"
25 #define EXPLOSIONGRID 8
26 #define EXPLOSIONVERTS ((EXPLOSIONGRID+1)*(EXPLOSIONGRID+1))
27 #define EXPLOSIONTRIS (EXPLOSIONGRID*EXPLOSIONGRID*2)
29 static int numexplosions = 0;
31 static float explosiontexcoord2f[EXPLOSIONVERTS][2];
32 static unsigned short explosiontris[EXPLOSIONTRIS][3];
33 static int explosionnoiseindex[EXPLOSIONVERTS];
34 static vec3_t explosionpoint[EXPLOSIONVERTS];
36 typedef struct explosion_s
44 vec3_t vert[EXPLOSIONVERTS];
45 vec3_t vertvel[EXPLOSIONVERTS];
50 static explosion_t explosion[MAX_EXPLOSIONS];
52 static rtexture_t *explosiontexture;
53 static rtexture_t *explosiontexturefog;
55 static rtexturepool_t *explosiontexturepool;
58 cvar_t r_explosionclip = {CVAR_SAVE, "r_explosionclip", "1", "enables collision detection for explosion shell (so that it flattens against walls and floors)"};
60 static cvar_t r_drawexplosions = {0, "r_drawexplosions", "1", "enables rendering of explosion shells (see also cl_particles_explosions_shell)"};
62 static void r_explosion_start(void)
65 unsigned char noise1[128][128], noise2[128][128], noise3[128][128], data[128][128][4];
66 explosiontexturepool = R_AllocTexturePool();
67 fractalnoise(&noise1[0][0], 128, 32);
68 fractalnoise(&noise2[0][0], 128, 4);
69 fractalnoise(&noise3[0][0], 128, 4);
70 for (y = 0;y < 128;y++)
72 for (x = 0;x < 128;x++)
75 j = (noise1[y][x] * noise2[y][x]) * 3 / 256 - 128;
79 a = noise3[y][x] * 3 - 128;
80 data[y][x][2] = bound(0, r, 255);
81 data[y][x][1] = bound(0, g, 255);
82 data[y][x][0] = bound(0, b, 255);
83 data[y][x][3] = bound(0, a, 255);
86 explosiontexture = R_LoadTexture2D(explosiontexturepool, "explosiontexture", 128, 128, &data[0][0][0], TEXTYPE_BGRA, TEXF_MIPMAP | TEXF_ALPHA | TEXF_PRECACHE | TEXF_FORCELINEAR, NULL);
87 for (y = 0;y < 128;y++)
88 for (x = 0;x < 128;x++)
89 data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
90 explosiontexturefog = R_LoadTexture2D(explosiontexturepool, "explosiontexturefog", 128, 128, &data[0][0][0], TEXTYPE_BGRA, TEXF_MIPMAP | TEXF_ALPHA | TEXF_PRECACHE | TEXF_FORCELINEAR, NULL);
91 // note that explosions survive the restart
94 static void r_explosion_shutdown(void)
96 R_FreeTexturePool(&explosiontexturepool);
99 static void r_explosion_newmap(void)
102 memset(explosion, 0, sizeof(explosion));
105 static int R_ExplosionVert(int column, int row)
109 // top and bottom rows are all one position...
110 if (row == 0 || row == EXPLOSIONGRID)
112 i = row * (EXPLOSIONGRID + 1) + column;
113 yaw = ((double) column / EXPLOSIONGRID) * M_PI * 2;
114 pitch = (((double) row / EXPLOSIONGRID) - 0.5) * M_PI;
115 explosionpoint[i][0] = cos(yaw) * cos(pitch);
116 explosionpoint[i][1] = sin(yaw) * cos(pitch);
117 explosionpoint[i][2] = 1 * -sin(pitch);
118 explosiontexcoord2f[i][0] = (float) column / (float) EXPLOSIONGRID;
119 explosiontexcoord2f[i][1] = (float) row / (float) EXPLOSIONGRID;
120 explosionnoiseindex[i] = (row % EXPLOSIONGRID) * EXPLOSIONGRID + (column % EXPLOSIONGRID);
125 void R_Explosion_Init(void)
127 #ifdef MAX_EXPLOSIONS
130 for (y = 0;y < EXPLOSIONGRID;y++)
132 for (x = 0;x < EXPLOSIONGRID;x++)
134 explosiontris[i][0] = R_ExplosionVert(x , y );
135 explosiontris[i][1] = R_ExplosionVert(x + 1, y );
136 explosiontris[i][2] = R_ExplosionVert(x , y + 1);
138 explosiontris[i][0] = R_ExplosionVert(x + 1, y );
139 explosiontris[i][1] = R_ExplosionVert(x + 1, y + 1);
140 explosiontris[i][2] = R_ExplosionVert(x , y + 1);
146 Cvar_RegisterVariable(&r_explosionclip);
147 #ifdef MAX_EXPLOSIONS
148 Cvar_RegisterVariable(&r_drawexplosions);
150 R_RegisterModule("R_Explosions", r_explosion_start, r_explosion_shutdown, r_explosion_newmap);
154 void R_NewExplosion(const vec3_t org)
156 #ifdef MAX_EXPLOSIONS
161 unsigned char noise[EXPLOSIONGRID*EXPLOSIONGRID];
162 fractalnoisequick(noise, EXPLOSIONGRID, 4); // adjust noise grid size according to explosion
163 for (i = 0, e = explosion;i < MAX_EXPLOSIONS;i++, e++)
167 numexplosions = max(numexplosions, i + 1);
168 e->starttime = cl.time;
169 e->endtime = cl.time + cl_explosions_lifetime.value;
170 e->time = e->starttime;
171 e->alpha = cl_explosions_alpha_start.value;
172 e->fade = (cl_explosions_alpha_start.value - cl_explosions_alpha_end.value) / cl_explosions_lifetime.value;
173 e->clipping = r_explosionclip.integer != 0;
174 VectorCopy(org, e->origin);
175 for (j = 0;j < EXPLOSIONVERTS;j++)
177 // calculate start origin and velocity
178 n = noise[explosionnoiseindex[j]] * (1.0f / 255.0f) + 0.5;
179 dist = n * cl_explosions_size_start.value;
180 VectorMA(e->origin, dist, explosionpoint[j], e->vert[j]);
181 dist = n * (cl_explosions_size_end.value - cl_explosions_size_start.value) / cl_explosions_lifetime.value;
182 VectorScale(explosionpoint[j], dist, e->vertvel[j]);
186 trace = CL_TraceLine(e->origin, e->vert[j], MOVE_NOMONSTERS, NULL, SUPERCONTENTS_SOLID, true, false, NULL, false);
187 VectorCopy(trace.endpos, e->vert[i]);
196 #ifdef MAX_EXPLOSIONS
197 static void R_DrawExplosion_TransparentCallback(const entity_render_t *ent, const rtlight_t *rtlight, int numsurfaces, int *surfacelist)
199 int surfacelistindex = 0;
200 const int numtriangles = EXPLOSIONTRIS, numverts = EXPLOSIONVERTS;
202 GL_BlendFunc(GL_SRC_ALPHA, GL_ONE);
205 GL_PolygonOffset(r_refdef.polygonfactor, r_refdef.polygonoffset);
207 GL_CullFace(r_refdef.view.cullface_back);
208 R_Mesh_Matrix(&identitymatrix);
210 R_SetupGenericShader(true);
211 R_Mesh_ColorPointer(NULL, 0, 0);
212 memset(&m, 0, sizeof(m));
213 m.tex[0] = R_GetTexture(explosiontexture);
214 m.pointer_texcoord[0] = explosiontexcoord2f[0];
215 R_Mesh_TextureState(&m);
216 for (surfacelistindex = 0;surfacelistindex < numsurfaces;surfacelistindex++)
218 const explosion_t *e = explosion + surfacelist[surfacelistindex];
219 R_Mesh_VertexPointer(e->vert[0], 0, 0);
220 // FIXME: fixed function path can't properly handle r_refdef.view.colorscale > 1
221 GL_Color(e->alpha * r_refdef.view.colorscale, e->alpha * r_refdef.view.colorscale, e->alpha * r_refdef.view.colorscale, 1);
222 GL_LockArrays(0, numverts);
223 R_Mesh_Draw(0, numverts, 0, numtriangles, NULL, explosiontris[0], 0, 0);
228 static void R_MoveExplosion(explosion_t *e)
231 float dot, end[3], frametime;
234 frametime = cl.time - e->time;
236 e->alpha = e->alpha - (e->fade * frametime);
237 if (e->alpha < 0 || cl.time > e->endtime)
242 for (i = 0;i < EXPLOSIONVERTS;i++)
244 if (e->vertvel[i][0] || e->vertvel[i][1] || e->vertvel[i][2])
246 VectorMA(e->vert[i], frametime, e->vertvel[i], end);
249 trace = CL_TraceLine(e->vert[i], end, MOVE_NOMONSTERS, NULL, SUPERCONTENTS_SOLID, true, false, NULL, false);
250 if (trace.fraction < 1)
252 // clip velocity against the wall
253 dot = -DotProduct(e->vertvel[i], trace.plane.normal);
254 VectorMA(e->vertvel[i], dot, trace.plane.normal, e->vertvel[i]);
256 VectorCopy(trace.endpos, e->vert[i]);
259 VectorCopy(end, e->vert[i]);
265 void R_DrawExplosions(void)
267 #ifdef MAX_EXPLOSIONS
270 if (!r_drawexplosions.integer)
273 for (i = 0;i < numexplosions;i++)
275 if (explosion[i].alpha)
277 R_MoveExplosion(&explosion[i]);
278 if (explosion[i].alpha)
279 R_MeshQueue_AddTransparent(explosion[i].origin, R_DrawExplosion_TransparentCallback, NULL, i, NULL);
282 while (numexplosions > 0 && explosion[i-1].alpha <= 0)