migrated a large number of #define MAX values to quakedef.h and added a
[divverent/darkplaces.git] / r_explosion.c
1 /*
2 Copyright (C) 1996-1997 Id Software, Inc.
3
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.
8
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.
12
13 See the GNU General Public License for more details.
14
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.
18
19 */
20
21 #include "quakedef.h"
22 #include "cl_collision.h"
23
24 #ifdef MAX_EXPLOSIONS
25 #define EXPLOSIONGRID 8
26 #define EXPLOSIONVERTS ((EXPLOSIONGRID+1)*(EXPLOSIONGRID+1))
27 #define EXPLOSIONTRIS (EXPLOSIONGRID*EXPLOSIONGRID*2)
28
29 static int numexplosions = 0;
30
31 static float explosiontexcoord2f[EXPLOSIONVERTS][2];
32 static unsigned short explosiontris[EXPLOSIONTRIS][3];
33 static int explosionnoiseindex[EXPLOSIONVERTS];
34 static vec3_t explosionpoint[EXPLOSIONVERTS];
35
36 typedef struct explosion_s
37 {
38         float starttime;
39         float endtime;
40         float time;
41         float alpha;
42         float fade;
43         vec3_t origin;
44         vec3_t vert[EXPLOSIONVERTS];
45         vec3_t vertvel[EXPLOSIONVERTS];
46         qboolean clipping;
47 }
48 explosion_t;
49
50 static explosion_t explosion[MAX_EXPLOSIONS];
51
52 static rtexture_t       *explosiontexture;
53 static rtexture_t       *explosiontexturefog;
54
55 static rtexturepool_t   *explosiontexturepool;
56 #endif
57
58 cvar_t r_explosionclip = {CVAR_SAVE, "r_explosionclip", "1", "enables collision detection for explosion shell (so that it flattens against walls and floors)"};
59 #ifdef MAX_EXPLOSIONS
60 static cvar_t r_drawexplosions = {0, "r_drawexplosions", "1", "enables rendering of explosion shells (see also cl_particles_explosions_shell)"};
61
62 static void r_explosion_start(void)
63 {
64         int x, y;
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++)
71         {
72                 for (x = 0;x < 128;x++)
73                 {
74                         int j, r, g, b, a;
75                         j = (noise1[y][x] * noise2[y][x]) * 3 / 256 - 128;
76                         r = (j * 512) / 256;
77                         g = (j * 256) / 256;
78                         b = (j * 128) / 256;
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);
84                 }
85         }
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
92 }
93
94 static void r_explosion_shutdown(void)
95 {
96         R_FreeTexturePool(&explosiontexturepool);
97 }
98
99 static void r_explosion_newmap(void)
100 {
101         numexplosions = 0;
102         memset(explosion, 0, sizeof(explosion));
103 }
104
105 static int R_ExplosionVert(int column, int row)
106 {
107         int i;
108         float yaw, pitch;
109         // top and bottom rows are all one position...
110         if (row == 0 || row == EXPLOSIONGRID)
111                 column = 0;
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);
121         return i;
122 }
123 #endif
124
125 void R_Explosion_Init(void)
126 {
127 #ifdef MAX_EXPLOSIONS
128         int i, x, y;
129         i = 0;
130         for (y = 0;y < EXPLOSIONGRID;y++)
131         {
132                 for (x = 0;x < EXPLOSIONGRID;x++)
133                 {
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);
137                         i++;
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);
141                         i++;
142                 }
143         }
144
145 #endif
146         Cvar_RegisterVariable(&r_explosionclip);
147 #ifdef MAX_EXPLOSIONS
148         Cvar_RegisterVariable(&r_drawexplosions);
149
150         R_RegisterModule("R_Explosions", r_explosion_start, r_explosion_shutdown, r_explosion_newmap);
151 #endif
152 }
153
154 void R_NewExplosion(const vec3_t org)
155 {
156 #ifdef MAX_EXPLOSIONS
157         int i, j;
158         float dist, n;
159         explosion_t *e;
160         trace_t trace;
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++)
164         {
165                 if (!e->alpha)
166                 {
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++)
176                         {
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]);
183                                 // clip start origin
184                                 if (e->clipping)
185                                 {
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]);
188                                 }
189                         }
190                         break;
191                 }
192         }
193 #endif
194 }
195
196 #ifdef MAX_EXPLOSIONS
197 static void R_DrawExplosion_TransparentCallback(const entity_render_t *ent, const rtlight_t *rtlight, int numsurfaces, int *surfacelist)
198 {
199         int surfacelistindex = 0;
200         const int numtriangles = EXPLOSIONTRIS, numverts = EXPLOSIONVERTS;
201         rmeshstate_t m;
202         GL_BlendFunc(GL_SRC_ALPHA, GL_ONE);
203         GL_DepthMask(false);
204         GL_DepthRange(0, 1);
205         GL_PolygonOffset(r_refdef.polygonfactor, r_refdef.polygonoffset);
206         GL_DepthTest(true);
207         GL_CullFace(r_refdef.view.cullface_back);
208         R_Mesh_Matrix(&identitymatrix);
209
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++)
217         {
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);
224                 GL_LockArrays(0, 0);
225         }
226 }
227
228 static void R_MoveExplosion(explosion_t *e)
229 {
230         int i;
231         float dot, end[3], frametime;
232         trace_t trace;
233
234         frametime = cl.time - e->time;
235         e->time = cl.time;
236         e->alpha = e->alpha - (e->fade * frametime);
237         if (e->alpha < 0 || cl.time > e->endtime)
238         {
239                 e->alpha = 0;
240                 return;
241         }
242         for (i = 0;i < EXPLOSIONVERTS;i++)
243         {
244                 if (e->vertvel[i][0] || e->vertvel[i][1] || e->vertvel[i][2])
245                 {
246                         VectorMA(e->vert[i], frametime, e->vertvel[i], end);
247                         if (e->clipping)
248                         {
249                                 trace = CL_TraceLine(e->vert[i], end, MOVE_NOMONSTERS, NULL, SUPERCONTENTS_SOLID, true, false, NULL, false);
250                                 if (trace.fraction < 1)
251                                 {
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]);
255                                 }
256                                 VectorCopy(trace.endpos, e->vert[i]);
257                         }
258                         else
259                                 VectorCopy(end, e->vert[i]);
260                 }
261         }
262 }
263 #endif
264
265 void R_DrawExplosions(void)
266 {
267 #ifdef MAX_EXPLOSIONS
268         int i;
269
270         if (!r_drawexplosions.integer)
271                 return;
272
273         for (i = 0;i < numexplosions;i++)
274         {
275                 if (explosion[i].alpha)
276                 {
277                         R_MoveExplosion(&explosion[i]);
278                         if (explosion[i].alpha)
279                                 R_MeshQueue_AddTransparent(explosion[i].origin, R_DrawExplosion_TransparentCallback, NULL, i, NULL);
280                 }
281         }
282         while (numexplosions > 0 && explosion[i-1].alpha <= 0)
283                 numexplosions--;
284 #endif
285 }
286