1 |
/* Copyright (c) 1986 Regents of the University of California */ |
2 |
|
3 |
#ifndef lint |
4 |
static char SCCSid[] = "$SunId$ LBL"; |
5 |
#endif |
6 |
|
7 |
/* |
8 |
* rpict.c - routines and variables for picture generation. |
9 |
* |
10 |
* 8/14/85 |
11 |
*/ |
12 |
|
13 |
#include "ray.h" |
14 |
|
15 |
#ifdef BSD |
16 |
#include <sys/time.h> |
17 |
#include <sys/resource.h> |
18 |
#endif |
19 |
|
20 |
#include "view.h" |
21 |
|
22 |
#include "random.h" |
23 |
|
24 |
VIEW ourview = STDVIEW(512); /* view parameters */ |
25 |
|
26 |
int psample = 4; /* pixel sample size */ |
27 |
double maxdiff = .05; /* max. difference for interpolation */ |
28 |
double dstrpix = 0.67; /* square pixel distribution */ |
29 |
|
30 |
double dstrsrc = 0.0; /* square source distribution */ |
31 |
double shadthresh = .05; /* shadow threshold */ |
32 |
double shadcert = .5; /* shadow certainty */ |
33 |
|
34 |
int maxdepth = 6; /* maximum recursion depth */ |
35 |
double minweight = 5e-3; /* minimum ray weight */ |
36 |
|
37 |
COLOR ambval = BLKCOLOR; /* ambient value */ |
38 |
double ambacc = 0.2; /* ambient accuracy */ |
39 |
int ambres = 32; /* ambient resolution */ |
40 |
int ambdiv = 128; /* ambient divisions */ |
41 |
int ambssamp = 0; /* ambient super-samples */ |
42 |
int ambounce = 0; /* ambient bounces */ |
43 |
char *amblist[128]; /* ambient include/exclude list */ |
44 |
int ambincl = -1; /* include == 1, exclude == 0 */ |
45 |
|
46 |
int ralrm = 0; /* seconds between reports */ |
47 |
|
48 |
double pctdone = 0.0; /* percentage done */ |
49 |
|
50 |
extern long nrays; /* number of rays traced */ |
51 |
|
52 |
#define MAXDIV 32 /* maximum sample size */ |
53 |
|
54 |
#define pixjitter() (.5+dstrpix*(.5-frandom())) |
55 |
|
56 |
double pixvalue(); |
57 |
|
58 |
|
59 |
quit(code) /* quit program */ |
60 |
int code; |
61 |
{ |
62 |
if (code || ralrm > 0) /* report status */ |
63 |
report(); |
64 |
|
65 |
exit(code); |
66 |
} |
67 |
|
68 |
|
69 |
report() /* report progress */ |
70 |
{ |
71 |
#ifdef BSD |
72 |
struct rusage rubuf; |
73 |
double t; |
74 |
|
75 |
getrusage(RUSAGE_SELF, &rubuf); |
76 |
t = (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6; |
77 |
t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec; |
78 |
getrusage(RUSAGE_CHILDREN, &rubuf); |
79 |
t += (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6; |
80 |
t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec; |
81 |
|
82 |
sprintf(errmsg, "%ld rays, %4.2f%% done after %5.4f CPU hours\n", |
83 |
nrays, pctdone, t/3600.0); |
84 |
#else |
85 |
sprintf(errmsg, "%ld rays, %4.2f%% done\n", nrays, pctdone); |
86 |
#endif |
87 |
eputs(errmsg); |
88 |
|
89 |
if (ralrm > 0) |
90 |
alarm(ralrm); |
91 |
} |
92 |
|
93 |
|
94 |
render(zfile, oldfile) /* render the scene */ |
95 |
char *zfile, *oldfile; |
96 |
{ |
97 |
COLOR *scanbar[MAXDIV+1]; /* scanline arrays of pixel values */ |
98 |
float *zbar[MAXDIV+1]; /* z values */ |
99 |
int ypos; /* current scanline */ |
100 |
FILE *zfp; |
101 |
COLOR *colptr; |
102 |
float *zptr; |
103 |
register int i; |
104 |
/* check sampling */ |
105 |
if (psample < 1) |
106 |
psample = 1; |
107 |
else if (psample > MAXDIV) |
108 |
psample = MAXDIV; |
109 |
/* allocate scanlines */ |
110 |
for (i = 0; i <= psample; i++) { |
111 |
scanbar[i] = (COLOR *)malloc(ourview.hresolu*sizeof(COLOR)); |
112 |
if (scanbar[i] == NULL) |
113 |
goto memerr; |
114 |
} |
115 |
/* open z file */ |
116 |
if (zfile != NULL) { |
117 |
if ((zfp = fopen(zfile, "a+")) == NULL) { |
118 |
sprintf(errmsg, "cannot open z file \"%s\"", zfile); |
119 |
error(SYSTEM, errmsg); |
120 |
} |
121 |
for (i = 0; i <= psample; i++) { |
122 |
zbar[i] = (float *)malloc(ourview.hresolu*sizeof(float)); |
123 |
if (zbar[i] == NULL) |
124 |
goto memerr; |
125 |
} |
126 |
} else { |
127 |
zfp = NULL; |
128 |
for (i = 0; i <= psample; i++) |
129 |
zbar[i] = NULL; |
130 |
} |
131 |
/* write out boundaries */ |
132 |
fputresolu(YMAJOR|YDECR, ourview.hresolu, ourview.vresolu, stdout); |
133 |
/* recover file and compute first */ |
134 |
i = salvage(oldfile); |
135 |
if (zfp != NULL && fseek(zfp, (long)i*ourview.hresolu*sizeof(float), 0) == EOF) |
136 |
error(SYSTEM, "z file seek error in render"); |
137 |
ypos = ourview.vresolu-1 - i; |
138 |
fillscanline(scanbar[0], zbar[0], ourview.hresolu, ypos, psample); |
139 |
/* compute scanlines */ |
140 |
for (ypos -= psample; ypos >= 0; ypos -= psample) { |
141 |
|
142 |
pctdone = 100.0*(ourview.vresolu-ypos-psample)/ourview.vresolu; |
143 |
|
144 |
colptr = scanbar[psample]; /* move base to top */ |
145 |
scanbar[psample] = scanbar[0]; |
146 |
scanbar[0] = colptr; |
147 |
zptr = zbar[psample]; |
148 |
zbar[psample] = zbar[0]; |
149 |
zbar[0] = zptr; |
150 |
/* fill base line */ |
151 |
fillscanline(scanbar[0], zbar[0], ourview.hresolu, ypos, psample); |
152 |
/* fill bar */ |
153 |
fillscanbar(scanbar, zbar, ourview.hresolu, ypos, psample); |
154 |
/* write it out */ |
155 |
for (i = psample; i > 0; i--) { |
156 |
if (zfp != NULL && fwrite(zbar[i],sizeof(float),ourview.hresolu,zfp) != ourview.hresolu) |
157 |
goto writerr; |
158 |
if (fwritescan(scanbar[i],ourview.hresolu,stdout) < 0) |
159 |
goto writerr; |
160 |
} |
161 |
if (zfp != NULL && fflush(zfp) == EOF) |
162 |
goto writerr; |
163 |
if (fflush(stdout) == EOF) |
164 |
goto writerr; |
165 |
} |
166 |
/* compute residual */ |
167 |
colptr = scanbar[psample]; |
168 |
scanbar[psample] = scanbar[0]; |
169 |
scanbar[0] = colptr; |
170 |
zptr = zbar[psample]; |
171 |
zbar[psample] = zbar[0]; |
172 |
zbar[0] = zptr; |
173 |
if (ypos > -psample) { |
174 |
fillscanline(scanbar[-ypos], zbar[-ypos], ourview.hresolu, |
175 |
0, psample); |
176 |
fillscanbar(scanbar-ypos, zbar-ypos, ourview.hresolu, |
177 |
0, psample+ypos); |
178 |
} |
179 |
for (i = psample; i+ypos >= 0; i--) { |
180 |
if (zfp != NULL && fwrite(zbar[i],sizeof(float),ourview.hresolu,zfp) != ourview.hresolu) |
181 |
goto writerr; |
182 |
if (fwritescan(scanbar[i], ourview.hresolu, stdout) < 0) |
183 |
goto writerr; |
184 |
} |
185 |
/* clean up */ |
186 |
if (zfp != NULL) { |
187 |
if (fclose(zfp) == EOF) |
188 |
goto writerr; |
189 |
for (i = 0; i <= psample; i++) |
190 |
free((char *)zbar[i]); |
191 |
} |
192 |
if (fflush(stdout) == EOF) |
193 |
goto writerr; |
194 |
for (i = 0; i <= psample; i++) |
195 |
free((char *)scanbar[i]); |
196 |
pctdone = 100.0; |
197 |
return; |
198 |
writerr: |
199 |
error(SYSTEM, "write error in render"); |
200 |
memerr: |
201 |
error(SYSTEM, "out of memory in render"); |
202 |
} |
203 |
|
204 |
|
205 |
fillscanline(scanline, zline, xres, y, xstep) /* fill scan line at y */ |
206 |
register COLOR *scanline; |
207 |
register float *zline; |
208 |
int xres, y, xstep; |
209 |
{ |
210 |
int b = xstep; |
211 |
double z; |
212 |
register int i; |
213 |
|
214 |
z = pixvalue(scanline[0], 0, y); |
215 |
if (zline) zline[0] = z; |
216 |
|
217 |
for (i = xstep; i < xres; i += xstep) { |
218 |
|
219 |
z = pixvalue(scanline[i], i, y); |
220 |
if (zline) zline[i] = z; |
221 |
|
222 |
b = fillsample(scanline+i-xstep, zline ? zline+i-xstep : NULL, |
223 |
i-xstep, y, xstep, 0, b/2); |
224 |
} |
225 |
if (i-xstep < xres-1) { |
226 |
z = pixvalue(scanline[xres-1], xres-1, y); |
227 |
if (zline) zline[xres-1] = z; |
228 |
fillsample(scanline+i-xstep, zline ? zline+i-xstep : NULL, |
229 |
i-xstep, y, xres-1-(i-xstep), 0, b/2); |
230 |
} |
231 |
} |
232 |
|
233 |
|
234 |
fillscanbar(scanbar, zbar, xres, y, ysize) /* fill interior */ |
235 |
register COLOR *scanbar[]; |
236 |
register float *zbar[]; |
237 |
int xres, y, ysize; |
238 |
{ |
239 |
COLOR vline[MAXDIV+1]; |
240 |
float zline[MAXDIV+1]; |
241 |
int b = ysize; |
242 |
double z; |
243 |
register int i, j; |
244 |
|
245 |
for (i = 0; i < xres; i++) { |
246 |
|
247 |
copycolor(vline[0], scanbar[0][i]); |
248 |
copycolor(vline[ysize], scanbar[ysize][i]); |
249 |
if (zbar[0]) { |
250 |
zline[0] = zbar[0][i]; |
251 |
zline[ysize] = zbar[ysize][i]; |
252 |
} |
253 |
|
254 |
b = fillsample(vline, zbar[0] ? zline : NULL, |
255 |
i, y, 0, ysize, b/2); |
256 |
|
257 |
for (j = 1; j < ysize; j++) |
258 |
copycolor(scanbar[j][i], vline[j]); |
259 |
if (zbar[0]) |
260 |
for (j = 1; j < ysize; j++) |
261 |
zbar[j][i] = zline[j]; |
262 |
} |
263 |
} |
264 |
|
265 |
|
266 |
int |
267 |
fillsample(colline, zline, x, y, xlen, ylen, b) /* fill interior points */ |
268 |
register COLOR *colline; |
269 |
register float *zline; |
270 |
int x, y; |
271 |
int xlen, ylen; |
272 |
int b; |
273 |
{ |
274 |
extern double fabs(); |
275 |
double ratio; |
276 |
double z; |
277 |
COLOR ctmp; |
278 |
int ncut; |
279 |
register int len; |
280 |
|
281 |
if (xlen > 0) /* x or y length is zero */ |
282 |
len = xlen; |
283 |
else |
284 |
len = ylen; |
285 |
|
286 |
if (len <= 1) /* limit recursion */ |
287 |
return(0); |
288 |
|
289 |
if (b > 0 |
290 |
|| (zline && 2.*fabs(zline[0]-zline[len]) > maxdiff*(zline[0]+zline[len])) |
291 |
|| bigdiff(colline[0], colline[len], maxdiff)) { |
292 |
|
293 |
z = pixvalue(colline[len>>1], x + (xlen>>1), y + (ylen>>1)); |
294 |
if (zline) zline[len>>1] = z; |
295 |
ncut = 1; |
296 |
|
297 |
} else { /* interpolate */ |
298 |
|
299 |
copycolor(colline[len>>1], colline[len]); |
300 |
ratio = (double)(len>>1) / len; |
301 |
scalecolor(colline[len>>1], ratio); |
302 |
if (zline) zline[len>>1] = zline[len] * ratio; |
303 |
ratio = 1.0 - ratio; |
304 |
copycolor(ctmp, colline[0]); |
305 |
scalecolor(ctmp, ratio); |
306 |
addcolor(colline[len>>1], ctmp); |
307 |
if (zline) zline[len>>1] += zline[0] * ratio; |
308 |
ncut = 0; |
309 |
} |
310 |
/* recurse */ |
311 |
ncut += fillsample(colline, zline, x, y, xlen>>1, ylen>>1, (b-1)/2); |
312 |
|
313 |
ncut += fillsample(colline+(len>>1), zline ? zline+(len>>1) : NULL, |
314 |
x+(xlen>>1), y+(ylen>>1), |
315 |
xlen-(xlen>>1), ylen-(ylen>>1), b/2); |
316 |
|
317 |
return(ncut); |
318 |
} |
319 |
|
320 |
|
321 |
double |
322 |
pixvalue(col, x, y) /* compute pixel value */ |
323 |
COLOR col; /* returned color */ |
324 |
int x, y; /* pixel position */ |
325 |
{ |
326 |
static RAY thisray; /* our ray for this pixel */ |
327 |
|
328 |
rayview(thisray.rorg, thisray.rdir, &ourview, |
329 |
x + pixjitter(), y + pixjitter()); |
330 |
|
331 |
rayorigin(&thisray, NULL, PRIMARY, 1.0); |
332 |
|
333 |
rayvalue(&thisray); /* trace ray */ |
334 |
|
335 |
copycolor(col, thisray.rcol); /* return color */ |
336 |
|
337 |
return(thisray.rot); /* return distance */ |
338 |
} |
339 |
|
340 |
|
341 |
int |
342 |
salvage(oldfile) /* salvage scanlines from killed program */ |
343 |
char *oldfile; |
344 |
{ |
345 |
COLR *scanline; |
346 |
FILE *fp; |
347 |
int x, y; |
348 |
|
349 |
if (oldfile == NULL) |
350 |
return(0); |
351 |
|
352 |
if ((fp = fopen(oldfile, "r")) == NULL) { |
353 |
sprintf(errmsg, "cannot open recover file \"%s\"", oldfile); |
354 |
error(WARNING, errmsg); |
355 |
return(0); |
356 |
} |
357 |
/* discard header */ |
358 |
getheader(fp, NULL); |
359 |
/* get picture size */ |
360 |
if (fgetresolu(&x, &y, fp) != (YMAJOR|YDECR)) { |
361 |
sprintf(errmsg, "bad recover file \"%s\"", oldfile); |
362 |
error(WARNING, errmsg); |
363 |
fclose(fp); |
364 |
return(0); |
365 |
} |
366 |
|
367 |
if (x != ourview.hresolu || y != ourview.vresolu) { |
368 |
sprintf(errmsg, "resolution mismatch in recover file \"%s\"", |
369 |
oldfile); |
370 |
error(USER, errmsg); |
371 |
} |
372 |
|
373 |
scanline = (COLR *)malloc(ourview.hresolu*sizeof(COLR)); |
374 |
if (scanline == NULL) |
375 |
error(SYSTEM, "out of memory in salvage"); |
376 |
for (y = 0; y < ourview.vresolu; y++) { |
377 |
if (freadcolrs(scanline, ourview.hresolu, fp) < 0) |
378 |
break; |
379 |
if (fwritecolrs(scanline, ourview.hresolu, stdout) < 0) |
380 |
goto writerr; |
381 |
} |
382 |
if (fflush(stdout) == EOF) |
383 |
goto writerr; |
384 |
free((char *)scanline); |
385 |
fclose(fp); |
386 |
unlink(oldfile); |
387 |
return(y); |
388 |
writerr: |
389 |
error(SYSTEM, "write error in salvage"); |
390 |
} |