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 // r_light.c - PENTA: almost obsolete now
21
22 #include "quakedef.h"
23
24 int r_dlightframecount;
25
26 //PENTA: Math utitity's
ProjectVector(const vec3_t b,const vec3_t a,vec3_t c)27 void ProjectVector(const vec3_t b,const vec3_t a,vec3_t c) {
28
29 float dpa,dpab;
30
31 dpa = DotProduct(a,a);
32 dpab = DotProduct(a,b)/dpa;
33 c[0] = a[0] * dpab;
34 c[1] = a[1] * dpab;
35 c[2] = a[2] * dpab;
36 }
37
38
ProjectPlane(const vec3_t src,const vec3_t v1,const vec3_t v2,vec3_t dst)39 void ProjectPlane(const vec3_t src,const vec3_t v1,const vec3_t v2,vec3_t dst) {
40
41 vec3_t t1,t2;
42
43 ProjectVector(src, v1, t1);
44 ProjectVector(src, v2, t2);
45
46 VectorAdd(t1,t2,dst);
47 }
48
49 /*
50 ==================
51 R_AnimateLight
52 ==================
53 */
R_AnimateLight(void)54 void R_AnimateLight (void)
55 {
56 int i,j,k;
57
58 //
59 // light animations
60 // 'm' is normal light, 'a' is no light, 'z' is double bright
61 i = (int)(cl.time*10);
62 for (j=0 ; j<MAX_LIGHTSTYLES ; j++)
63 {
64 if (!cl_lightstyle[j].length)
65 {
66 d_lightstylevalue[j] = 256;
67 continue;
68 }
69 k = i % cl_lightstyle[j].length;
70 k = cl_lightstyle[j].map[k] - 'a';
71 k = k*22;
72 d_lightstylevalue[j] = k;
73 }
74 }
75
76 /*
77 =============================================================================
78
79 LIGHT SAMPLING
80
81 =============================================================================
82 */
83
84 mplane_t *lightplane;
85 vec3_t lightspot;
86
RecursiveLightPoint(mnode_t * node,vec3_t start,vec3_t end)87 int RecursiveLightPoint (mnode_t *node, vec3_t start, vec3_t end)
88 {
89 int r;
90 float front, back, frac;
91 int side;
92 mplane_t *plane;
93 vec3_t mid;
94 msurface_t *surf;
95 int s, t, ds, dt;
96 int i;
97 mtexinfo_t *tex;
98 byte *lightmap;
99 unsigned scale;
100 int maps;
101
102 if (node->contents < 0)
103 return -1; // didn't hit anything
104
105 // calculate mid point
106
107 // FIXME: optimize for axial
108 plane = node->plane;
109 front = DotProduct (start, plane->normal) - plane->dist;
110 back = DotProduct (end, plane->normal) - plane->dist;
111 side = front < 0;
112
113 if ( (back < 0) == side)
114 return RecursiveLightPoint (node->children[side], start, end);
115
116 frac = front / (front-back);
117 mid[0] = start[0] + (end[0] - start[0])*frac;
118 mid[1] = start[1] + (end[1] - start[1])*frac;
119 mid[2] = start[2] + (end[2] - start[2])*frac;
120
121 // go down front side
122 r = RecursiveLightPoint (node->children[side], start, mid);
123 if (r >= 0)
124 return r; // hit something
125
126 if ( (back < 0) == side )
127 return -1; // didn't hit anuthing
128
129 // check for impact on this node
130 VectorCopy (mid, lightspot);
131 lightplane = plane;
132
133 surf = cl.worldmodel->surfaces + node->firstsurface;
134 for (i=0 ; i<node->numsurfaces ; i++, surf++)
135 {
136 if (surf->flags & SURF_DRAWTILED)
137 continue; // no lightmaps
138
139 tex = surf->texinfo;
140
141 s = DotProduct (mid, tex->vecs[0]) + tex->vecs[0][3];
142 t = DotProduct (mid, tex->vecs[1]) + tex->vecs[1][3];;
143
144 if (s < surf->texturemins[0] ||
145 t < surf->texturemins[1])
146 continue;
147
148 ds = s - surf->texturemins[0];
149 dt = t - surf->texturemins[1];
150
151 if ( ds > surf->extents[0] || dt > surf->extents[1] )
152 continue;
153
154 if (!surf->samples)
155 return 0;
156
157 ds >>= 4;
158 dt >>= 4;
159
160 lightmap = surf->samples;
161 r = 0;
162 if (lightmap)
163 {
164
165 lightmap += dt * ((surf->extents[0]>>4)+1) + ds;
166
167 for (maps = 0 ; maps < MAXLIGHTMAPS && surf->styles[maps] != 255 ;
168 maps++)
169 {
170 scale = d_lightstylevalue[surf->styles[maps]];
171 r += *lightmap * scale;
172 lightmap += ((surf->extents[0]>>4)+1) *
173 ((surf->extents[1]>>4)+1);
174 }
175
176 r >>= 8;
177 }
178
179 return r;
180 }
181
182 // go down back side
183 return RecursiveLightPoint (node->children[!side], mid, end);
184 }
185
R_LightPoint(vec3_t p)186 int R_LightPoint (vec3_t p)
187 {
188 vec3_t end;
189 int r;
190
191 if (!cl.worldmodel->lightdata)
192 return 255;
193
194 end[0] = p[0];
195 end[1] = p[1];
196 end[2] = p[2] - 2048;
197
198 r = RecursiveLightPoint (cl.worldmodel->nodes, p, end);
199
200 if (r == -1)
201 r = 0;
202
203 return r;
204 }
205
206