12 |
|
#include "rhdisp.h" |
13 |
|
#include "view.h" |
14 |
|
|
15 |
+ |
struct cellist { |
16 |
+ |
GCOORD *cl; |
17 |
+ |
int n; |
18 |
+ |
}; |
19 |
|
|
20 |
+ |
|
21 |
|
int |
22 |
|
npixels(vp, hr, vr, hp, bi) /* compute appropriate number to evaluate */ |
23 |
< |
VIEW *vp; |
23 |
> |
register VIEW *vp; |
24 |
|
int hr, vr; |
25 |
|
HOLO *hp; |
26 |
|
int bi; |
27 |
|
{ |
28 |
+ |
VIEW vrev; |
29 |
|
GCOORD gc[2]; |
30 |
< |
FVECT cp[4]; |
31 |
< |
FVECT ip[4]; |
26 |
< |
double d; |
30 |
> |
FVECT cp[4], ip[4]; |
31 |
> |
double af, ab; |
32 |
|
register int i; |
33 |
|
/* compute cell corners in image */ |
34 |
|
if (!hdbcoord(gc, hp, bi)) |
35 |
|
error(CONSISTENCY, "bad beam index in npixels"); |
36 |
< |
hdcell(cp, hp, gc+1); |
36 |
> |
hdcell(cp, hp, gc+1); /* find cell on front image */ |
37 |
|
for (i = 0; i < 4; i++) { |
38 |
|
viewloc(ip[i], vp, cp[i]); |
39 |
+ |
if (ip[i][2] < 0.) { |
40 |
+ |
af = 0; |
41 |
+ |
goto getback; |
42 |
+ |
} |
43 |
+ |
ip[i][0] *= (double)hr; /* scale by resolution */ |
44 |
+ |
ip[i][1] *= (double)vr; |
45 |
+ |
} |
46 |
+ |
/* compute front area */ |
47 |
+ |
af = (ip[1][0]-ip[0][0])*(ip[2][1]-ip[0][1]) - |
48 |
+ |
(ip[2][0]-ip[0][0])*(ip[1][1]-ip[0][1]); |
49 |
+ |
af += (ip[2][0]-ip[3][0])*(ip[1][1]-ip[3][1]) - |
50 |
+ |
(ip[1][0]-ip[3][0])*(ip[2][1]-ip[3][1]); |
51 |
+ |
if (af >= 0) af *= 0.5; |
52 |
+ |
else af *= -0.5; |
53 |
+ |
getback: |
54 |
+ |
copystruct(&vrev, vp); /* compute reverse view */ |
55 |
+ |
for (i = 0; i < 3; i++) { |
56 |
+ |
vrev.vdir[i] = -vp->vdir[i]; |
57 |
+ |
vrev.vup[i] = -vp->vup[i]; |
58 |
+ |
vrev.hvec[i] = -vp->hvec[i]; |
59 |
+ |
vrev.vvec[i] = -vp->vvec[i]; |
60 |
+ |
} |
61 |
+ |
hdcell(cp, hp, gc); /* find cell on back image */ |
62 |
+ |
for (i = 0; i < 4; i++) { |
63 |
+ |
viewloc(ip[i], &vrev, cp[i]); |
64 |
|
if (ip[i][2] < 0.) |
65 |
< |
return(0); |
65 |
> |
return((int)(af + 0.5)); |
66 |
|
ip[i][0] *= (double)hr; /* scale by resolution */ |
67 |
|
ip[i][1] *= (double)vr; |
68 |
|
} |
69 |
< |
/* compute quad area */ |
70 |
< |
d = (ip[1][0]-ip[0][0])*(ip[2][1]-ip[0][1]) - |
69 |
> |
/* compute back area */ |
70 |
> |
ab = (ip[1][0]-ip[0][0])*(ip[2][1]-ip[0][1]) - |
71 |
|
(ip[2][0]-ip[0][0])*(ip[1][1]-ip[0][1]); |
72 |
< |
d += (ip[2][0]-ip[3][0])*(ip[1][1]-ip[3][1]) - |
72 |
> |
ab += (ip[2][0]-ip[3][0])*(ip[1][1]-ip[3][1]) - |
73 |
|
(ip[1][0]-ip[3][0])*(ip[2][1]-ip[3][1]); |
74 |
< |
if (d < 0) |
75 |
< |
d = -d; |
76 |
< |
/* round off result */ |
77 |
< |
return((int)(.5*d+.5)); |
74 |
> |
if (ab >= 0) ab *= 0.5; |
75 |
> |
else ab *= -0.5; |
76 |
> |
/* round off smaller area */ |
77 |
> |
if (af <= ab) |
78 |
> |
return((int)(af + 0.5)); |
79 |
> |
return((int)(ab + 0.5)); |
80 |
|
} |
81 |
|
|
82 |
|
|
84 |
|
* The ray directions that define the pyramid in visit_cells() needn't |
85 |
|
* be normalized, but they must be given in clockwise order as seen |
86 |
|
* from the pyramid's apex (origin). |
87 |
+ |
* If no cell centers fall within the domain, the closest cell is visited. |
88 |
|
*/ |
89 |
|
int |
90 |
|
visit_cells(orig, pyrd, hp, vf, dp) /* visit cells within a pyramid */ |
91 |
|
FVECT orig, pyrd[4]; /* pyramid ray directions in clockwise order */ |
92 |
< |
HOLO *hp; |
92 |
> |
register HOLO *hp; |
93 |
|
int (*vf)(); |
94 |
|
char *dp; |
95 |
|
{ |
96 |
< |
int n = 0; |
96 |
> |
int ncalls = 0, n = 0; |
97 |
|
int inflags = 0; |
98 |
|
FVECT gp, pn[4], lo, ld; |
99 |
|
double po[4], lbeg, lend, d, t; |
100 |
< |
GCOORD gc; |
100 |
> |
GCOORD gc, gc2[2]; |
101 |
|
register int i; |
102 |
|
/* figure out whose side we're on */ |
103 |
|
hdgrid(gp, hp, orig); |
135 |
|
} else if (d < -FTINY) { /* plane -> */ |
136 |
|
if ((t /= d) > lbeg) |
137 |
|
lbeg = t; |
138 |
< |
} else if (t < 0) /* outside */ |
139 |
< |
goto nextscan; |
138 |
> |
} else if (t < 0) { /* outside */ |
139 |
> |
lend = -1; |
140 |
> |
break; |
141 |
> |
} |
142 |
|
} |
143 |
+ |
if (lbeg >= lend) |
144 |
+ |
continue; |
145 |
|
i = lend + .5; /* visit cells on this scan */ |
146 |
< |
for (gc.i[0] = lbeg + .5; gc.i[0] < i; gc.i[0]++) |
146 |
> |
for (gc.i[0] = lbeg + .5; gc.i[0] < i; gc.i[0]++) { |
147 |
|
n += (*vf)(&gc, dp); |
148 |
< |
nextscan:; |
148 |
> |
ncalls++; |
149 |
> |
} |
150 |
|
} |
151 |
|
} |
152 |
< |
return(n); |
152 |
> |
if (ncalls) /* got one at least */ |
153 |
> |
return(n); |
154 |
> |
/* else find closest cell */ |
155 |
> |
VSUM(ld, pyrd[0], pyrd[1], 1.); |
156 |
> |
VSUM(ld, ld, pyrd[2], 1.); |
157 |
> |
VSUM(ld, ld, pyrd[3], 1.); |
158 |
> |
#if 0 |
159 |
> |
if (normalize(ld) == 0.0) /* technically not necessary */ |
160 |
> |
return(0); |
161 |
> |
#endif |
162 |
> |
d = hdinter(gc2, NULL, &t, hp, orig, ld); |
163 |
> |
if (d >= FHUGE || t <= 0.) |
164 |
> |
return(0); |
165 |
> |
return((*vf)(gc2+1, dp)); /* visit it */ |
166 |
|
} |
167 |
|
|
168 |
|
|
169 |
+ |
sect_behind(hp, vp) /* check if section is "behind" viewpoint */ |
170 |
+ |
register HOLO *hp; |
171 |
+ |
register VIEW *vp; |
172 |
+ |
{ |
173 |
+ |
FVECT hcent; |
174 |
+ |
/* compute holodeck section center */ |
175 |
+ |
VSUM(hcent, hp->orig, hp->xv[0], 0.5); |
176 |
+ |
VSUM(hcent, hcent, hp->xv[1], 0.5); |
177 |
+ |
VSUM(hcent, hcent, hp->xv[2], 0.5); |
178 |
+ |
/* behind if center is behind */ |
179 |
+ |
return(DOT(vp->vdir,hcent) < DOT(vp->vdir,vp->vp)); |
180 |
+ |
} |
181 |
+ |
|
182 |
+ |
|
183 |
+ |
viewpyramid(org, dir, hp, vp) /* compute view pyramid */ |
184 |
+ |
FVECT org, dir[4]; |
185 |
+ |
HOLO *hp; |
186 |
+ |
VIEW *vp; |
187 |
+ |
{ |
188 |
+ |
register int i; |
189 |
+ |
/* check view type */ |
190 |
+ |
if (vp->type == VT_PAR) |
191 |
+ |
return(0); |
192 |
+ |
/* in front or behind? */ |
193 |
+ |
if (!sect_behind(hp, vp)) { |
194 |
+ |
if (viewray(org, dir[0], vp, 0., 0.) < -FTINY) |
195 |
+ |
return(0); |
196 |
+ |
if (viewray(org, dir[1], vp, 0., 1.) < -FTINY) |
197 |
+ |
return(0); |
198 |
+ |
if (viewray(org, dir[2], vp, 1., 1.) < -FTINY) |
199 |
+ |
return(0); |
200 |
+ |
if (viewray(org, dir[3], vp, 1., 0.) < -FTINY) |
201 |
+ |
return(0); |
202 |
+ |
return(1); |
203 |
+ |
} /* reverse pyramid */ |
204 |
+ |
if (viewray(org, dir[3], vp, 0., 0.) < -FTINY) |
205 |
+ |
return(0); |
206 |
+ |
if (viewray(org, dir[2], vp, 0., 1.) < -FTINY) |
207 |
+ |
return(0); |
208 |
+ |
if (viewray(org, dir[1], vp, 1., 1.) < -FTINY) |
209 |
+ |
return(0); |
210 |
+ |
if (viewray(org, dir[0], vp, 1., 0.) < -FTINY) |
211 |
+ |
return(0); |
212 |
+ |
for (i = 0; i < 3; i++) { |
213 |
+ |
dir[0][i] = -dir[0][i]; |
214 |
+ |
dir[1][i] = -dir[1][i]; |
215 |
+ |
dir[2][i] = -dir[2][i]; |
216 |
+ |
dir[3][i] = -dir[3][i]; |
217 |
+ |
} |
218 |
+ |
return(-1); |
219 |
+ |
} |
220 |
+ |
|
221 |
+ |
|
222 |
|
int |
223 |
|
addcell(gcp, cl) /* add a cell to a list */ |
224 |
|
GCOORD *gcp; |
225 |
< |
register int *cl; |
225 |
> |
register struct cellist *cl; |
226 |
|
{ |
227 |
< |
copystruct((GCOORD *)(cl+1) + *cl, gcp); |
228 |
< |
(*cl)++; |
227 |
> |
copystruct(cl->cl+cl->n, gcp); |
228 |
> |
cl->n++; |
229 |
|
return(1); |
230 |
|
} |
231 |
|
|
244 |
|
} |
245 |
|
|
246 |
|
|
247 |
< |
int * |
248 |
< |
getviewcells(hp, vp) /* get ordered cell list for section view */ |
247 |
> |
GCOORD * |
248 |
> |
getviewcells(np, hp, vp) /* get ordered cell list for section view */ |
249 |
> |
int *np; /* returned number of cells (negative if reversed) */ |
250 |
|
register HOLO *hp; |
251 |
|
VIEW *vp; |
252 |
|
{ |
253 |
|
FVECT org, dir[4]; |
254 |
< |
int n; |
255 |
< |
register int *cl; |
254 |
> |
int orient; |
255 |
> |
struct cellist cl; |
256 |
|
/* compute view pyramid */ |
257 |
< |
if (vp->type == VT_PAR) goto viewerr; |
258 |
< |
if (viewray(org, dir[0], vp, 0., 0.) < -FTINY) goto viewerr; |
259 |
< |
if (viewray(org, dir[1], vp, 0., 1.) < -FTINY) goto viewerr; |
260 |
< |
if (viewray(org, dir[2], vp, 1., 1.) < -FTINY) goto viewerr; |
156 |
< |
if (viewray(org, dir[3], vp, 1., 0.) < -FTINY) goto viewerr; |
257 |
> |
*np = 0; |
258 |
> |
orient = viewpyramid(org, dir, hp, vp); |
259 |
> |
if (!orient) |
260 |
> |
return(NULL); |
261 |
|
/* allocate enough list space */ |
262 |
< |
n = 2*( hp->grid[0]*hp->grid[1] + |
263 |
< |
hp->grid[0]*hp->grid[2] + |
264 |
< |
hp->grid[1]*hp->grid[2] ); |
265 |
< |
cl = (int *)malloc(sizeof(int) + n*sizeof(GCOORD)); |
266 |
< |
if (cl == NULL) |
262 |
> |
cl.n = 2*( hp->grid[0]*hp->grid[1] + |
263 |
> |
hp->grid[0]*hp->grid[2] + |
264 |
> |
hp->grid[1]*hp->grid[2] ); |
265 |
> |
cl.cl = (GCOORD *)malloc(cl.n*sizeof(GCOORD)); |
266 |
> |
if (cl.cl == NULL) |
267 |
|
goto memerr; |
268 |
< |
*cl = 0; |
269 |
< |
/* add cells within pyramid */ |
270 |
< |
visit_cells(org, dir, hp, addcell, cl); |
271 |
< |
if (!*cl) { |
168 |
< |
free((char *)cl); |
268 |
> |
cl.n = 0; /* add cells within pyramid */ |
269 |
> |
visit_cells(org, dir, hp, addcell, &cl); |
270 |
> |
if (!cl.n) { |
271 |
> |
free((char *)cl.cl); |
272 |
|
return(NULL); |
273 |
|
} |
274 |
+ |
*np = cl.n * orient; |
275 |
|
#if 0 |
276 |
|
/* We're just going to free this memory in a moment, and list is |
277 |
|
* sorted automatically by visit_cells(), so we don't need this. |
278 |
|
*/ |
279 |
< |
if (*cl < n) { /* optimize memory use */ |
280 |
< |
cl = (int *)realloc((char *)cl, |
281 |
< |
sizeof(int) + *cl*sizeof(GCOORD)); |
282 |
< |
if (cl == NULL) |
179 |
< |
goto memerr; |
180 |
< |
} |
279 |
> |
/* optimize memory use */ |
280 |
> |
cl.cl = (GCOORD *)realloc((char *)cl.cl, cl.n*sizeof(GCOORD)); |
281 |
> |
if (cl.cl == NULL) |
282 |
> |
goto memerr; |
283 |
|
/* sort the list */ |
284 |
< |
qsort((char *)(cl+1), *cl, sizeof(GCOORD), cellcmp); |
284 |
> |
qsort((char *)cl.cl, cl.n, sizeof(GCOORD), cellcmp); |
285 |
|
#endif |
286 |
< |
return(cl); |
185 |
< |
viewerr: |
186 |
< |
error(INTERNAL, "unusable view in getviewcells"); |
286 |
> |
return(cl.cl); |
287 |
|
memerr: |
288 |
|
error(SYSTEM, "out of memory in getviewcells"); |
289 |
+ |
} |
290 |
+ |
|
291 |
+ |
|
292 |
+ |
gridlines(f) /* run through holodeck section grid lines */ |
293 |
+ |
int (*f)(); |
294 |
+ |
{ |
295 |
+ |
register int hd, w, i; |
296 |
+ |
int g0, g1; |
297 |
+ |
FVECT wp[2], mov; |
298 |
+ |
double d; |
299 |
+ |
/* do each wall on each section */ |
300 |
+ |
for (hd = 0; hdlist[hd] != NULL; hd++) |
301 |
+ |
for (w = 0; w < 6; w++) { |
302 |
+ |
g0 = ((w>>1)+1)%3; |
303 |
+ |
g1 = ((w>>1)+2)%3; |
304 |
+ |
d = 1.0/hdlist[hd]->grid[g0]; |
305 |
+ |
mov[0] = d * hdlist[hd]->xv[g0][0]; |
306 |
+ |
mov[1] = d * hdlist[hd]->xv[g0][1]; |
307 |
+ |
mov[2] = d * hdlist[hd]->xv[g0][2]; |
308 |
+ |
if (w & 1) { |
309 |
+ |
VSUM(wp[0], hdlist[hd]->orig, |
310 |
+ |
hdlist[hd]->xv[w>>1], 1.); |
311 |
+ |
VSUM(wp[0], wp[0], mov, 1.); |
312 |
+ |
} else |
313 |
+ |
VCOPY(wp[0], hdlist[hd]->orig); |
314 |
+ |
VSUM(wp[1], wp[0], hdlist[hd]->xv[g1], 1.); |
315 |
+ |
for (i = hdlist[hd]->grid[g0]; ; ) { /* g0 lines */ |
316 |
+ |
(*f)(wp); |
317 |
+ |
if (!--i) break; |
318 |
+ |
wp[0][0] += mov[0]; wp[0][1] += mov[1]; |
319 |
+ |
wp[0][2] += mov[2]; wp[1][0] += mov[0]; |
320 |
+ |
wp[1][1] += mov[1]; wp[1][2] += mov[2]; |
321 |
+ |
} |
322 |
+ |
d = 1.0/hdlist[hd]->grid[g1]; |
323 |
+ |
mov[0] = d * hdlist[hd]->xv[g1][0]; |
324 |
+ |
mov[1] = d * hdlist[hd]->xv[g1][1]; |
325 |
+ |
mov[2] = d * hdlist[hd]->xv[g1][2]; |
326 |
+ |
if (w & 1) |
327 |
+ |
VSUM(wp[0], hdlist[hd]->orig, |
328 |
+ |
hdlist[hd]->xv[w>>1], 1.); |
329 |
+ |
else |
330 |
+ |
VSUM(wp[0], hdlist[hd]->orig, mov, 1.); |
331 |
+ |
VSUM(wp[1], wp[0], hdlist[hd]->xv[g0], 1.); |
332 |
+ |
for (i = hdlist[hd]->grid[g1]; ; ) { /* g1 lines */ |
333 |
+ |
(*f)(wp); |
334 |
+ |
if (!--i) break; |
335 |
+ |
wp[0][0] += mov[0]; wp[0][1] += mov[1]; |
336 |
+ |
wp[0][2] += mov[2]; wp[1][0] += mov[0]; |
337 |
+ |
wp[1][1] += mov[1]; wp[1][2] += mov[2]; |
338 |
+ |
} |
339 |
+ |
} |
340 |
|
} |