1 |
greg |
2.1 |
#ifndef lint |
2 |
greg |
2.9 |
static const char RCSid[] = "$Id: srcobstr.c,v 2.8 2004/09/08 17:10:16 greg Exp $"; |
3 |
greg |
2.1 |
#endif |
4 |
|
|
/* |
5 |
|
|
* Source occlusion caching routines |
6 |
|
|
*/ |
7 |
|
|
|
8 |
|
|
#include "ray.h" |
9 |
|
|
|
10 |
|
|
#include "otypes.h" |
11 |
|
|
|
12 |
|
|
#include "otspecial.h" |
13 |
|
|
|
14 |
|
|
#include "source.h" |
15 |
|
|
|
16 |
|
|
#define ABS(x) ((x)>0 ? (x) : -(x)) |
17 |
|
|
|
18 |
|
|
|
19 |
|
|
#if SHADCACHE /* preemptive shadow checking */ |
20 |
|
|
|
21 |
|
|
|
22 |
greg |
2.7 |
static int /* cast source ray to first blocker */ |
23 |
greg |
2.1 |
castshadow(int sn, FVECT rorg, FVECT rdir) |
24 |
|
|
{ |
25 |
|
|
RAY rt; |
26 |
|
|
|
27 |
|
|
VCOPY(rt.rorg, rorg); |
28 |
|
|
VCOPY(rt.rdir, rdir); |
29 |
|
|
rt.rmax = 0; |
30 |
|
|
rayorigin(&rt, NULL, PRIMARY, 1.0); |
31 |
greg |
2.7 |
/* check for intersection */ |
32 |
|
|
while (localhit(&rt, &thescene)) { |
33 |
|
|
RAY rt1 = rt; /* pretend we were aimed at source */ |
34 |
|
|
rt1.crtype |= rt1.rtype = SHADOW; |
35 |
|
|
rt1.rdir[0] = -rt.rdir[0]; |
36 |
|
|
rt1.rdir[1] = -rt.rdir[1]; |
37 |
|
|
rt1.rdir[2] = -rt.rdir[2]; |
38 |
|
|
rt1.rod = -rt.rod; |
39 |
|
|
VSUB(rt1.rorg, rt.rop, rt.rdir); |
40 |
|
|
rt1.rot = 1.; |
41 |
|
|
rt1.rsrc = sn; |
42 |
greg |
2.1 |
/* record blocker */ |
43 |
greg |
2.7 |
if (srcblocker(&rt1)) |
44 |
|
|
return(1); |
45 |
|
|
/* move past failed blocker */ |
46 |
|
|
VSUM(rt.rorg, rt.rop, rt.rdir, FTINY); |
47 |
|
|
rayclear(&rt); /* & try again... */ |
48 |
|
|
} |
49 |
|
|
return(0); /* found no blockers */ |
50 |
greg |
2.1 |
} |
51 |
|
|
|
52 |
|
|
|
53 |
greg |
2.8 |
void /* initialize occlusion cache */ |
54 |
greg |
2.1 |
initobscache(int sn) |
55 |
|
|
{ |
56 |
|
|
register SRCREC *srcp = &source[sn]; |
57 |
|
|
int cachelen; |
58 |
|
|
FVECT rorg, rdir; |
59 |
|
|
RREAL d; |
60 |
|
|
int i, j, k; |
61 |
|
|
int ax, ax1, ax2; |
62 |
|
|
|
63 |
greg |
2.8 |
if (srcp->sflags & (SSKIP|SPROX|SSPOT|SVIRTUAL)) |
64 |
|
|
return; /* don't cache these */ |
65 |
greg |
2.1 |
if (srcp->sflags & SDISTANT) |
66 |
|
|
cachelen = 4*SHADCACHE*SHADCACHE; |
67 |
|
|
else if (srcp->sflags & SFLAT) |
68 |
|
|
cachelen = SHADCACHE*SHADCACHE*3 + (SHADCACHE&1)*SHADCACHE*4; |
69 |
|
|
else /* spherical distribution */ |
70 |
|
|
cachelen = SHADCACHE*SHADCACHE*6; |
71 |
|
|
/* allocate cache */ |
72 |
|
|
srcp->obscache = (OBSCACHE *)malloc(sizeof(OBSCACHE) + |
73 |
|
|
sizeof(OBJECT)*(cachelen-1)); |
74 |
|
|
if (srcp->obscache == NULL) |
75 |
|
|
error(SYSTEM, "out of memory in initobscache()"); |
76 |
|
|
/* set parameters */ |
77 |
|
|
if (srcp->sflags & SDISTANT) { |
78 |
|
|
RREAL amax = 0; |
79 |
|
|
for (ax1 = 3; ax1--; ) |
80 |
|
|
if (ABS(srcp->sloc[ax1]) > amax) { |
81 |
|
|
amax = ABS(srcp->sloc[ax1]); |
82 |
|
|
ax = ax1; |
83 |
|
|
} |
84 |
|
|
srcp->obscache->p.d.ax = ax; |
85 |
|
|
ax1 = (ax+1)%3; |
86 |
|
|
ax2 = (ax+2)%3; |
87 |
|
|
VCOPY(srcp->obscache->p.d.o, thescene.cuorg); |
88 |
|
|
if (srcp->sloc[ax] > 0) |
89 |
|
|
srcp->obscache->p.d.o[ax] += thescene.cusize; |
90 |
|
|
if (srcp->sloc[ax1] < 0) |
91 |
|
|
srcp->obscache->p.d.o[ax1] += thescene.cusize * |
92 |
|
|
srcp->sloc[ax1] / amax; |
93 |
|
|
if (srcp->sloc[ax2] < 0) |
94 |
|
|
srcp->obscache->p.d.o[ax2] += thescene.cusize * |
95 |
|
|
srcp->sloc[ax2] / amax; |
96 |
|
|
srcp->obscache->p.d.e1 = 1. / (thescene.cusize*(1. + |
97 |
|
|
fabs(srcp->sloc[ax1])/amax)); |
98 |
|
|
srcp->obscache->p.d.e2 = 1. / (thescene.cusize*(1. + |
99 |
|
|
fabs(srcp->sloc[ax2])/amax)); |
100 |
|
|
} else if (srcp->sflags & SFLAT) { |
101 |
|
|
VCOPY(srcp->obscache->p.f.u, srcp->ss[SU]); |
102 |
|
|
normalize(srcp->obscache->p.f.u); |
103 |
|
|
fcross(srcp->obscache->p.f.v, |
104 |
|
|
srcp->snorm, srcp->obscache->p.f.u); |
105 |
|
|
} |
106 |
|
|
/* clear cache */ |
107 |
|
|
for (i = cachelen; i--; ) |
108 |
|
|
srcp->obscache->obs[i] = OVOID; |
109 |
|
|
/* cast shadow rays */ |
110 |
|
|
if (srcp->sflags & SDISTANT) { |
111 |
|
|
for (k = 3; k--; ) |
112 |
|
|
rdir[k] = -srcp->sloc[k]; |
113 |
|
|
for (i = 2*SHADCACHE; i--; ) |
114 |
|
|
for (j = 2*SHADCACHE; j--; ) { |
115 |
|
|
VCOPY(rorg, srcp->obscache->p.d.o); |
116 |
|
|
rorg[ax1] += (i+.5) / |
117 |
|
|
(2*SHADCACHE*srcp->obscache->p.d.e1); |
118 |
|
|
rorg[ax2] += (j+.5) / |
119 |
|
|
(2*SHADCACHE*srcp->obscache->p.d.e2); |
120 |
|
|
castshadow(sn, rorg, rdir); |
121 |
|
|
} |
122 |
|
|
} else if (srcp->sflags & SFLAT) { |
123 |
|
|
d = 0.01*srcp->srad; |
124 |
|
|
VSUM(rorg, srcp->sloc, srcp->snorm, d); |
125 |
|
|
for (i = SHADCACHE; i--; ) |
126 |
|
|
for (j = SHADCACHE; j--; ) { |
127 |
|
|
d = 2./SHADCACHE*(i+.5) - 1.; |
128 |
|
|
VSUM(rdir, srcp->snorm, |
129 |
|
|
srcp->obscache->p.f.u, d); |
130 |
|
|
d = 2./SHADCACHE*(j+.5) - 1.; |
131 |
|
|
VSUM(rdir, rdir, srcp->obscache->p.f.v, d); |
132 |
|
|
normalize(rdir); |
133 |
|
|
castshadow(sn, rorg, rdir); |
134 |
|
|
} |
135 |
|
|
for (k = 2; k--; ) |
136 |
|
|
for (i = SHADCACHE; i--; ) |
137 |
|
|
for (j = SHADCACHE>>1; j--; ) { |
138 |
|
|
d = 2./SHADCACHE*(i+.5) - 1.; |
139 |
|
|
if (k) |
140 |
|
|
VSUM(rdir, srcp->obscache->p.f.u, |
141 |
|
|
srcp->obscache->p.f.v, d); |
142 |
|
|
else |
143 |
|
|
VSUM(rdir, srcp->obscache->p.f.v, |
144 |
|
|
srcp->obscache->p.f.u, d); |
145 |
greg |
2.3 |
d = 1. - 2./SHADCACHE*(j+.5); |
146 |
greg |
2.1 |
VSUM(rdir, rdir, srcp->snorm, d); |
147 |
|
|
normalize(rdir); |
148 |
|
|
castshadow(sn, rorg, rdir); |
149 |
|
|
d = 2.*DOT(rdir, srcp->snorm); |
150 |
|
|
rdir[0] = d*srcp->snorm[0] - rdir[0]; |
151 |
|
|
rdir[1] = d*srcp->snorm[1] - rdir[1]; |
152 |
|
|
rdir[2] = d*srcp->snorm[2] - rdir[2]; |
153 |
|
|
castshadow(sn, rorg, rdir); |
154 |
|
|
} |
155 |
|
|
} else /* spherical distribution */ |
156 |
|
|
for (k = 6; k--; ) { |
157 |
|
|
ax = k%3; |
158 |
|
|
ax1 = (k+1)%3; |
159 |
|
|
ax2 = (k+2)%3; |
160 |
|
|
for (i = SHADCACHE; i--; ) |
161 |
|
|
for (j = SHADCACHE; j--; ) { |
162 |
|
|
rdir[0]=rdir[1]=rdir[2] = 0.; |
163 |
|
|
rdir[ax] = k<3 ? 1. : -1.; |
164 |
|
|
rdir[ax1] = 2./SHADCACHE*(i+.5) - 1.; |
165 |
|
|
rdir[ax2] = 2./SHADCACHE*(j+.5) - 1.; |
166 |
|
|
normalize(rdir); |
167 |
|
|
d = 1.05*srcp->srad; |
168 |
|
|
VSUM(rorg, srcp->sloc, rdir, d); |
169 |
|
|
castshadow(sn, rorg, rdir); |
170 |
|
|
} |
171 |
|
|
} |
172 |
|
|
} |
173 |
|
|
|
174 |
|
|
|
175 |
|
|
static OBJECT * /* return occluder cache entry */ |
176 |
|
|
srcobstructp(register RAY *r) |
177 |
|
|
{ |
178 |
greg |
2.6 |
static unsigned long lastrno = ~0; |
179 |
greg |
2.1 |
static OBJECT noobs; |
180 |
greg |
2.6 |
static OBJECT *lastobjp; |
181 |
greg |
2.1 |
SRCREC *srcp; |
182 |
|
|
int ondx; |
183 |
|
|
|
184 |
greg |
2.6 |
noobs = OVOID; |
185 |
|
|
if (r->rno == lastrno) |
186 |
|
|
return lastobjp; /* just recall last pointer */ |
187 |
greg |
2.1 |
DCHECK(r->rsrc < 0, CONSISTENCY, |
188 |
|
|
"srcobstructp() called with unaimed ray"); |
189 |
greg |
2.6 |
lastrno = r->rno; |
190 |
|
|
lastobjp = &noobs; |
191 |
greg |
2.1 |
srcp = &source[r->rsrc]; |
192 |
|
|
if (srcp->sflags & (SSKIP|SPROX|SSPOT|SVIRTUAL)) |
193 |
|
|
return(&noobs); /* don't cache these */ |
194 |
|
|
if (srcp->obscache == NULL) /* initialize cache */ |
195 |
|
|
initobscache(r->rsrc); |
196 |
|
|
/* compute cache index */ |
197 |
|
|
if (srcp->sflags & SDISTANT) { |
198 |
|
|
int ax, ax1, ax2; |
199 |
|
|
double t; |
200 |
|
|
ax = srcp->obscache->p.d.ax; |
201 |
|
|
if ((ax1 = ax+1) >= 3) ax1 -= 3; |
202 |
|
|
if ((ax2 = ax+2) >= 3) ax2 -= 3; |
203 |
|
|
t = (srcp->obscache->p.d.o[ax] - r->rorg[ax]) / srcp->sloc[ax]; |
204 |
|
|
if (t <= FTINY) |
205 |
|
|
return(&noobs); /* could happen if ray is outside */ |
206 |
|
|
ondx = 2*SHADCACHE*(int)(2*SHADCACHE*srcp->obscache->p.d.e1 * |
207 |
|
|
(r->rorg[ax1] + t*srcp->sloc[ax1] - |
208 |
|
|
srcp->obscache->p.d.o[ax1])); |
209 |
|
|
ondx += (int)(2*SHADCACHE*srcp->obscache->p.d.e2 * |
210 |
|
|
(r->rorg[ax2] + t*srcp->sloc[ax2] - |
211 |
|
|
srcp->obscache->p.d.o[ax2])); |
212 |
schorsch |
2.4 |
if ((ondx < 0) | (ondx >= 4*SHADCACHE*SHADCACHE)) |
213 |
greg |
2.1 |
return(&noobs); /* could happen if ray is outside */ |
214 |
|
|
} else if (srcp->sflags & SFLAT) { |
215 |
|
|
FVECT sd; |
216 |
|
|
RREAL sd0m, sd1m; |
217 |
|
|
sd[0] = -DOT(r->rdir, srcp->obscache->p.f.u); |
218 |
|
|
sd[1] = -DOT(r->rdir, srcp->obscache->p.f.v); |
219 |
|
|
sd[2] = -DOT(r->rdir, srcp->snorm); |
220 |
|
|
if (sd[2] < 0) |
221 |
|
|
return(&noobs); /* shouldn't happen */ |
222 |
|
|
sd0m = ABS(sd[0]); |
223 |
|
|
sd1m = ABS(sd[1]); |
224 |
|
|
if (sd[2] >= sd0m && sd[2] >= sd1m) { |
225 |
|
|
ondx = SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
226 |
|
|
(1. + sd[0]/sd[2])); |
227 |
|
|
ondx += (int)(SHADCACHE*(.5-FTINY) * |
228 |
|
|
(1. + sd[1]/sd[2])); |
229 |
|
|
} else if (sd0m >= sd1m) { |
230 |
|
|
ondx = SHADCACHE*SHADCACHE; |
231 |
|
|
if (sd[0] < 0) |
232 |
|
|
ondx += ((SHADCACHE+1)>>1)*SHADCACHE; |
233 |
|
|
ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
234 |
greg |
2.3 |
(1. - sd[2]/sd0m)); |
235 |
greg |
2.1 |
ondx += (int)(SHADCACHE*(.5-FTINY) * |
236 |
|
|
(1. + sd[1]/sd0m)); |
237 |
|
|
} else /* sd1m > sd0m */ { |
238 |
|
|
ondx = SHADCACHE*SHADCACHE + |
239 |
|
|
((SHADCACHE+1)>>1)*SHADCACHE*2; |
240 |
|
|
if (sd[1] < 0) |
241 |
|
|
ondx += ((SHADCACHE+1)>>1)*SHADCACHE; |
242 |
|
|
ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
243 |
greg |
2.3 |
(1. - sd[2]/sd1m)); |
244 |
greg |
2.1 |
ondx += (int)(SHADCACHE*(.5-FTINY) * |
245 |
|
|
(1. + sd[0]/sd1m)); |
246 |
|
|
} |
247 |
greg |
2.6 |
DCHECK((ondx < 0) | (ondx >= SHADCACHE*SHADCACHE*3 + |
248 |
|
|
(SHADCACHE&1)*SHADCACHE*4), CONSISTENCY, |
249 |
greg |
2.3 |
"flat source cache index out of bounds"); |
250 |
greg |
2.1 |
} else /* spherical distribution */ { |
251 |
|
|
int ax, ax1, ax2; |
252 |
|
|
RREAL amax = 0; |
253 |
|
|
for (ax1 = 3; ax1--; ) |
254 |
|
|
if (ABS(r->rdir[ax1]) > amax) { |
255 |
|
|
amax = ABS(r->rdir[ax1]); |
256 |
|
|
ax = ax1; |
257 |
|
|
} |
258 |
|
|
if ((ax1 = ax+1) >= 3) ax1 -= 3; |
259 |
|
|
if ((ax2 = ax+2) >= 3) ax2 -= 3; |
260 |
|
|
ondx = 2*SHADCACHE*SHADCACHE * ax; |
261 |
|
|
if (r->rdir[ax] < 0) |
262 |
|
|
ondx += SHADCACHE*SHADCACHE; |
263 |
|
|
ondx += SHADCACHE*(int)(SHADCACHE*(.5-FTINY) * |
264 |
|
|
(1. + r->rdir[ax1]/amax)); |
265 |
|
|
ondx += (int)(SHADCACHE*(.5-FTINY) * |
266 |
|
|
(1. + r->rdir[ax2]/amax)); |
267 |
greg |
2.6 |
DCHECK((ondx < 0) | (ondx >= SHADCACHE*SHADCACHE*6), CONSISTENCY, |
268 |
greg |
2.3 |
"radial source cache index out of bounds"); |
269 |
greg |
2.1 |
} |
270 |
|
|
/* return cache pointer */ |
271 |
greg |
2.6 |
return(lastobjp = &srcp->obscache->obs[ondx]); |
272 |
greg |
2.1 |
} |
273 |
|
|
|
274 |
|
|
|
275 |
|
|
void /* free obstruction cache */ |
276 |
|
|
freeobscache(SRCREC *srcp) |
277 |
|
|
{ |
278 |
|
|
if (srcp->obscache == NULL) |
279 |
|
|
return; |
280 |
|
|
free((void *)srcp->obscache); |
281 |
|
|
srcp->obscache = NULL; |
282 |
|
|
} |
283 |
|
|
|
284 |
|
|
|
285 |
greg |
2.7 |
int /* record a source blocker */ |
286 |
greg |
2.1 |
srcblocker(register RAY *r) |
287 |
|
|
{ |
288 |
|
|
OBJREC *m; |
289 |
|
|
|
290 |
|
|
if (r->robj == OVOID || objptr(r->robj) != r->ro || |
291 |
|
|
isvolume(r->ro->otype)) |
292 |
greg |
2.7 |
return(0); /* don't record complex blockers */ |
293 |
greg |
2.1 |
m = findmaterial(r->ro); |
294 |
|
|
if (m == NULL) |
295 |
greg |
2.7 |
return(0); /* no material?! */ |
296 |
greg |
2.5 |
if (!isopaque(m->otype)) |
297 |
greg |
2.7 |
return(0); /* material not a reliable blocker */ |
298 |
greg |
2.1 |
*srcobstructp(r) = r->robj; /* else record obstructor */ |
299 |
greg |
2.7 |
return(1); |
300 |
greg |
2.1 |
} |
301 |
|
|
|
302 |
|
|
|
303 |
|
|
int /* check ray against cached blocker */ |
304 |
|
|
srcblocked(RAY *r) |
305 |
|
|
{ |
306 |
|
|
OBJECT obs = *srcobstructp(r); |
307 |
|
|
OBJREC *op; |
308 |
|
|
|
309 |
|
|
if (obs == OVOID) |
310 |
|
|
return(0); |
311 |
|
|
op = objptr(obs); /* check for intersection */ |
312 |
greg |
2.9 |
if (!(*ofun[op->otype].funp)(op, r)) |
313 |
|
|
return(0); |
314 |
|
|
op = source[r->rsrc].so; /* check source really obstructed */ |
315 |
|
|
if ((*ofun[op->otype].funp)(op, r)) { |
316 |
|
|
rayclear(r); /* actually, source in front! */ |
317 |
|
|
return(0); |
318 |
|
|
} |
319 |
|
|
return(1); /* source truly blocked */ |
320 |
greg |
2.1 |
} |
321 |
|
|
|
322 |
|
|
|
323 |
|
|
#endif /* SHADCACHE */ |