1 |
gwlarson |
3.1 |
#ifndef lint |
2 |
greg |
3.3 |
static const char RCSid[] = "$Id$"; |
3 |
gwlarson |
3.1 |
#endif |
4 |
|
|
/* |
5 |
|
|
* Routines for handling OpenGL light sources |
6 |
|
|
*/ |
7 |
|
|
|
8 |
greg |
3.4 |
#include "copyright.h" |
9 |
greg |
3.3 |
|
10 |
gwlarson |
3.1 |
#include "radogl.h" |
11 |
|
|
|
12 |
|
|
double expval = 0.; /* global exposure value */ |
13 |
|
|
|
14 |
|
|
COLOR ambval = {0.2, 0.2, 0.2}; /* global ambient value */ |
15 |
|
|
|
16 |
|
|
int dolights = MAXLIGHTS; /* do how many more light sources? */ |
17 |
|
|
|
18 |
gwlarson |
3.2 |
int glightid[MAXLIGHTS] = {GL_LIGHT0, GL_LIGHT1, GL_LIGHT2, |
19 |
gwlarson |
3.1 |
GL_LIGHT3, GL_LIGHT4, GL_LIGHT5, GL_LIGHT6, GL_LIGHT7}; |
20 |
|
|
|
21 |
|
|
static int lightlist; /* light list id */ |
22 |
|
|
|
23 |
|
|
/* source types */ |
24 |
|
|
#define L_NONE 0 |
25 |
|
|
#define L_SOURCE 1 |
26 |
|
|
#define L_FLAT 2 |
27 |
|
|
#define L_SPHERE 3 |
28 |
|
|
|
29 |
|
|
static struct { |
30 |
|
|
int type; /* light type (0 if none) */ |
31 |
|
|
MATREC *m; /* light material */ |
32 |
|
|
FVECT pos; /* light position (or direction) */ |
33 |
|
|
FVECT norm; /* flat source normal */ |
34 |
|
|
double area; /* source area (or solid angle) */ |
35 |
|
|
} lightrec[MAXLIGHTS]; /* light source list */ |
36 |
|
|
|
37 |
|
|
static int nlights; /* number of defined lights */ |
38 |
|
|
|
39 |
greg |
3.3 |
static void l_flatsrc(), l_sphsrc(), l_source(); |
40 |
gwlarson |
3.1 |
|
41 |
|
|
|
42 |
greg |
3.3 |
void |
43 |
gwlarson |
3.1 |
lightinit() /* initialize lighting */ |
44 |
|
|
{ |
45 |
|
|
GLfloat ambv[4]; |
46 |
|
|
register int i; |
47 |
|
|
|
48 |
|
|
if (!dolights) |
49 |
|
|
return; |
50 |
|
|
glPushAttrib(GL_LIGHTING_BIT); |
51 |
|
|
if (expval <= FTINY && bright(ambval) > FTINY) |
52 |
|
|
expval = 0.2/bright(ambval); |
53 |
|
|
ambv[0] = expval*colval(ambval,RED); |
54 |
|
|
ambv[1] = expval*colval(ambval,GRN); |
55 |
|
|
ambv[2] = expval*colval(ambval,BLU); |
56 |
|
|
ambv[3] = 1.; |
57 |
|
|
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambv); |
58 |
|
|
glCallList(lightlist = newglist()); |
59 |
|
|
rgl_checkerr("in lightinit"); |
60 |
|
|
nlights = 0; |
61 |
|
|
} |
62 |
|
|
|
63 |
|
|
|
64 |
greg |
3.3 |
void |
65 |
gwlarson |
3.1 |
lightclean() /* clean up light source commands */ |
66 |
|
|
{ |
67 |
|
|
if ((dolights += nlights) <= 0) |
68 |
|
|
return; |
69 |
|
|
glPopAttrib(); |
70 |
|
|
} |
71 |
|
|
|
72 |
|
|
|
73 |
greg |
3.3 |
void |
74 |
gwlarson |
3.1 |
lightdefs() /* define light source list */ |
75 |
|
|
{ |
76 |
|
|
register int i; |
77 |
|
|
|
78 |
|
|
if (!nlights) |
79 |
|
|
return; |
80 |
|
|
glNewList(lightlist, GL_COMPILE); |
81 |
|
|
while (nlights--) { |
82 |
|
|
switch (lightrec[nlights].type) { |
83 |
|
|
case L_FLAT: |
84 |
|
|
l_flatsrc(nlights); |
85 |
|
|
break; |
86 |
|
|
case L_SPHERE: |
87 |
|
|
l_sphsrc(nlights); |
88 |
|
|
break; |
89 |
|
|
case L_SOURCE: |
90 |
|
|
l_source(nlights); |
91 |
|
|
break; |
92 |
|
|
default: |
93 |
|
|
error(CONSISTENCY, "botched light type in lightdefs"); |
94 |
|
|
} |
95 |
|
|
freemtl(lightrec[nlights].m); |
96 |
|
|
lightrec[nlights].type = L_NONE; |
97 |
|
|
} |
98 |
|
|
glEndList(); |
99 |
|
|
rgl_checkerr("defining lights"); |
100 |
|
|
} |
101 |
|
|
|
102 |
|
|
|
103 |
greg |
3.3 |
int |
104 |
gwlarson |
3.1 |
o_source(o) /* record a distant source */ |
105 |
|
|
register OBJREC *o; |
106 |
|
|
{ |
107 |
|
|
if (!dolights || !issrcmat((MATREC *)o->os)) |
108 |
|
|
return(0); |
109 |
|
|
if (o->oargs.nfargs != 4) |
110 |
|
|
objerror(o, USER, "bad # real arguments"); |
111 |
|
|
/* record type & material */ |
112 |
|
|
lightrec[nlights].type = L_SOURCE; |
113 |
|
|
(lightrec[nlights].m = (MATREC *)o->os)->nlinks++; |
114 |
|
|
/* assign direction */ |
115 |
|
|
VCOPY(lightrec[nlights].pos, o->oargs.farg); |
116 |
|
|
/* compute solid angle */ |
117 |
|
|
if (o->oargs.farg[3] <= FTINY) |
118 |
|
|
objerror(o, USER, "zero size"); |
119 |
|
|
lightrec[nlights].area = 2.*PI*(1. - cos(PI/180./2.*o->oargs.farg[3])); |
120 |
|
|
nlights++; dolights--; |
121 |
|
|
return(1); |
122 |
|
|
} |
123 |
|
|
|
124 |
|
|
|
125 |
|
|
int |
126 |
|
|
doflatsrc(m, pos, norm, area) /* record a flat source */ |
127 |
|
|
MATREC *m; |
128 |
|
|
FVECT pos, norm; |
129 |
|
|
double area; |
130 |
|
|
{ |
131 |
|
|
if (!dolights || !issrcmat(m) || area <= FTINY) |
132 |
|
|
return(0); |
133 |
|
|
/* record type & material */ |
134 |
|
|
lightrec[nlights].type = L_FLAT; |
135 |
|
|
(lightrec[nlights].m = m)->nlinks++; |
136 |
|
|
/* assign geometry */ |
137 |
|
|
VCOPY(lightrec[nlights].pos, pos); |
138 |
|
|
VCOPY(lightrec[nlights].norm, norm); |
139 |
|
|
lightrec[nlights].area = area; |
140 |
|
|
nlights++; dolights--; |
141 |
|
|
return(1); |
142 |
|
|
} |
143 |
|
|
|
144 |
|
|
|
145 |
|
|
int |
146 |
|
|
dosphsrc(m, pos, area) /* record a spherical source */ |
147 |
|
|
register MATREC *m; |
148 |
|
|
FVECT pos; |
149 |
|
|
double area; |
150 |
|
|
{ |
151 |
|
|
if (!dolights || !issrcmat(m) || area <= FTINY) |
152 |
|
|
return(0); |
153 |
|
|
/* record type & material */ |
154 |
|
|
lightrec[nlights].type = L_SPHERE; |
155 |
|
|
(lightrec[nlights].m = m)->nlinks++; |
156 |
|
|
/* assign geometry */ |
157 |
|
|
VCOPY(lightrec[nlights].pos, pos); |
158 |
|
|
lightrec[nlights].area = area; |
159 |
|
|
nlights++; dolights--; |
160 |
|
|
return(1); |
161 |
|
|
} |
162 |
|
|
|
163 |
|
|
|
164 |
greg |
3.3 |
static void |
165 |
gwlarson |
3.1 |
l_source(n) /* convert a distant source */ |
166 |
|
|
register int n; |
167 |
|
|
{ |
168 |
|
|
register MATREC *m = lightrec[n].m; |
169 |
gwlarson |
3.2 |
int thislight = glightid[n]; |
170 |
gwlarson |
3.1 |
GLfloat vec[4]; |
171 |
|
|
/* assign direction */ |
172 |
|
|
VCOPY(vec, lightrec[n].pos); |
173 |
|
|
vec[3] = 0.; |
174 |
|
|
glLightfv(thislight, GL_POSITION, vec); |
175 |
|
|
/* assign color */ |
176 |
|
|
vec[0] = expval*lightrec[n].area*colval(m->u.l.emission,RED); |
177 |
|
|
vec[1] = expval*lightrec[n].area*colval(m->u.l.emission,GRN); |
178 |
|
|
vec[2] = expval*lightrec[n].area*colval(m->u.l.emission,BLU); |
179 |
|
|
vec[3] = 1.; |
180 |
|
|
glLightfv(thislight, GL_SPECULAR, vec); |
181 |
|
|
glLightfv(thislight, GL_DIFFUSE, vec); |
182 |
|
|
vec[0] = vec[1] = vec[2] = 0.; vec[3] = 1.; |
183 |
|
|
glLightfv(thislight, GL_AMBIENT, vec); |
184 |
|
|
glEnable(thislight); |
185 |
|
|
} |
186 |
|
|
|
187 |
|
|
|
188 |
greg |
3.3 |
static void |
189 |
gwlarson |
3.1 |
l_flatsrc(n) /* convert a flat source */ |
190 |
|
|
register int n; |
191 |
|
|
{ |
192 |
|
|
GLfloat vec[4]; |
193 |
|
|
register MATREC *m = lightrec[n].m; |
194 |
gwlarson |
3.2 |
int thislight = glightid[n]; |
195 |
gwlarson |
3.1 |
/* assign position */ |
196 |
|
|
VCOPY(vec, lightrec[n].pos); vec[3] = 1.; |
197 |
|
|
glLightfv(thislight, GL_POSITION, vec); |
198 |
|
|
/* assign color */ |
199 |
|
|
vec[0] = expval*lightrec[n].area*colval(m->u.l.emission,RED); |
200 |
|
|
vec[1] = expval*lightrec[n].area*colval(m->u.l.emission,GRN); |
201 |
|
|
vec[2] = expval*lightrec[n].area*colval(m->u.l.emission,BLU); |
202 |
|
|
vec[3] = 1.; |
203 |
|
|
glLightfv(thislight, GL_SPECULAR, vec); |
204 |
|
|
glLightfv(thislight, GL_DIFFUSE, vec); |
205 |
|
|
vec[0] = vec[1] = vec[2] = 0.; vec[3] = 1.; |
206 |
|
|
glLightfv(thislight, GL_AMBIENT, vec); |
207 |
|
|
glLightf(thislight, GL_SPOT_EXPONENT, 1.); |
208 |
|
|
glLightf(thislight, GL_CONSTANT_ATTENUATION, 0.); |
209 |
|
|
glLightf(thislight, GL_LINEAR_ATTENUATION, 0.); |
210 |
|
|
glLightf(thislight, GL_QUADRATIC_ATTENUATION, 1.); |
211 |
|
|
if (m->type == MAT_SPOT && m->u.l.spotang < 90.) { |
212 |
|
|
glLightf(thislight, GL_SPOT_CUTOFF, m->u.l.spotang); |
213 |
|
|
glLightfv(thislight, GL_SPOT_DIRECTION, m->u.l.spotdir); |
214 |
|
|
} else { |
215 |
|
|
glLightf(thislight, GL_SPOT_CUTOFF, 90.); |
216 |
|
|
VCOPY(vec, lightrec[n].norm); |
217 |
|
|
glLightfv(thislight, GL_SPOT_DIRECTION, vec); |
218 |
|
|
} |
219 |
|
|
glEnable(thislight); |
220 |
|
|
} |
221 |
|
|
|
222 |
|
|
|
223 |
greg |
3.3 |
static void |
224 |
gwlarson |
3.1 |
l_sphsrc(n) /* convert a spherical source */ |
225 |
|
|
register int n; |
226 |
|
|
{ |
227 |
|
|
GLfloat vec[4]; |
228 |
|
|
register MATREC *m = lightrec[n].m; |
229 |
gwlarson |
3.2 |
int thislight = glightid[n]; |
230 |
gwlarson |
3.1 |
/* assign position */ |
231 |
|
|
VCOPY(vec, lightrec[n].pos); vec[3] = 1.; |
232 |
|
|
glLightfv(thislight, GL_POSITION, vec); |
233 |
|
|
/* assign color */ |
234 |
|
|
vec[0] = expval*lightrec[n].area*colval(m->u.l.emission,RED); |
235 |
|
|
vec[1] = expval*lightrec[n].area*colval(m->u.l.emission,GRN); |
236 |
|
|
vec[2] = expval*lightrec[n].area*colval(m->u.l.emission,BLU); |
237 |
|
|
vec[3] = 1.; |
238 |
|
|
glLightfv(thislight, GL_SPECULAR, vec); |
239 |
|
|
glLightfv(thislight, GL_DIFFUSE, vec); |
240 |
|
|
vec[0] = vec[1] = vec[2] = 0.; vec[3] = 1.; |
241 |
|
|
glLightfv(thislight, GL_AMBIENT, vec); |
242 |
|
|
glLightf(thislight, GL_SPOT_EXPONENT, 0.); |
243 |
|
|
glLightf(thislight, GL_CONSTANT_ATTENUATION, 0.); |
244 |
|
|
glLightf(thislight, GL_LINEAR_ATTENUATION, 0.); |
245 |
|
|
glLightf(thislight, GL_QUADRATIC_ATTENUATION, 1.); |
246 |
|
|
if (m->type == MAT_SPOT && m->u.l.spotang <= 90.) { |
247 |
|
|
glLightf(thislight, GL_SPOT_CUTOFF, m->u.l.spotang); |
248 |
|
|
glLightfv(thislight, GL_SPOT_DIRECTION, m->u.l.spotdir); |
249 |
|
|
} else |
250 |
|
|
glLightf(thislight, GL_SPOT_CUTOFF, 180.); |
251 |
|
|
glEnable(thislight); |
252 |
|
|
} |