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root/radiance/ray/src/util/glareval.c
Revision: 1.6
Committed: Thu Mar 21 16:46:25 1991 UTC (33 years ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 1.5: +4 -3 lines
Log Message:
fixed debug reporting

File Contents

# User Rev Content
1 greg 1.1 /* Copyright (c) 1991 Regents of the University of California */
2    
3     #ifndef lint
4     static char SCCSid[] = "$SunId$ LBL";
5     #endif
6    
7     /*
8     * Compute pixels for glare calculation
9     */
10    
11     #include "glare.h"
12     #include <sys/param.h>
13     /* compute rtrace buffer size */
14     #ifndef PIPE_BUF
15     #define PIPE_BUF 512 /* hyperconservative */
16     #endif
17     #define MAXPIX (PIPE_BUF/(6*sizeof(float)) - 1)
18    
19     #ifndef BSD
20     #define vfork fork
21     #endif
22    
23 greg 1.3 #define NSCANS 64 /* number of scanlines to buffer */
24 greg 1.1
25     int rt_pid = -1; /* process id for rtrace */
26     int fd_tort, fd_fromrt; /* pipe descriptors */
27    
28     FILE *pictfp = NULL; /* picture file pointer */
29     double exposure; /* picture exposure */
30     int pxsiz, pysiz; /* picture dimensions */
31     int curpos; /* current scanline */
32     long *scanpos; /* scanline positions */
33     struct {
34     long lused; /* for LRU replacement */
35     int y; /* scanline position */
36     COLR *sl; /* scanline contents */
37     } scan[NSCANS]; /* buffered scanlines */
38    
39 greg 1.2 static long ncall = 0L; /* number of calls to getpictscan */
40     static long nread = 0L; /* number of scanlines read */
41 greg 1.1
42 greg 1.5 extern long ftell();
43 greg 1.2
44 greg 1.5
45 greg 1.1 COLR *
46     getpictscan(y) /* get picture scanline */
47     int y;
48     {
49     int minused;
50     register int i;
51     /* first check our buffers */
52     ncall++;
53     minused = 0;
54     for (i = 0; i < NSCANS; i++) {
55     if (scan[i].y == y) {
56     scan[i].lused = ncall;
57     return(scan[i].sl);
58     }
59     if (scan[i].lused < scan[minused].lused)
60     minused = i;
61     }
62     /* not there, read it in */
63 greg 1.5 if (scanpos[y] < 0) { /* need to search */
64     for (i = y+1; i < curpos; i++)
65     if (scanpos[i] >= 0) {
66     if (fseek(pictfp, scanpos[i], 0) < 0)
67     goto seekerr;
68     curpos = i;
69     break;
70     }
71     while (curpos >= y) {
72 greg 1.1 scanpos[curpos] = ftell(pictfp);
73     if (freadcolrs(scan[minused].sl, pxsiz, pictfp) < 0)
74     goto readerr;
75 greg 1.5 nread++;
76 greg 1.1 curpos--;
77     }
78 greg 1.5 } else {
79     if (curpos != y && fseek(pictfp, scanpos[y], 0) < 0)
80     goto seekerr;
81     if (freadcolrs(scan[minused].sl, pxsiz, pictfp) < 0)
82     goto readerr;
83     nread++;
84     curpos = y-1;
85 greg 1.1 }
86     scan[minused].lused = ncall;
87     scan[minused].y = y;
88     return(scan[minused].sl);
89     readerr:
90     fprintf(stderr, "%s: picture read error\n", progname);
91     exit(1);
92 greg 1.5 seekerr:
93     fprintf(stderr, "%s: picture seek error\n", progname);
94     exit(1);
95 greg 1.1 }
96    
97    
98 greg 1.6 #ifdef DEBUG
99 greg 1.2 pict_stats() /* print out picture read statistics */
100     {
101     static long lastcall = 0L; /* ncall at last report */
102     static long lastread = 0L; /* nread at last report */
103    
104     if (ncall == lastcall)
105     return;
106 greg 1.6 fprintf(stderr, "%s: %ld scanlines read in %ld calls\n",
107     progname, nread-lastread, ncall-lastcall);
108 greg 1.2 lastcall = ncall;
109     lastread = nread;
110     }
111 greg 1.6 #endif
112 greg 1.2
113    
114 greg 1.1 double
115     pict_val(vd) /* find picture value for view direction */
116     FVECT vd;
117     {
118     FVECT pp;
119     double vpx, vpy, vpz;
120     COLOR res;
121    
122     if (pictfp == NULL)
123     return(-1.0);
124     pp[0] = pictview.vp[0] + vd[0];
125     pp[1] = pictview.vp[1] + vd[1];
126     pp[2] = pictview.vp[2] + vd[2];
127     viewpixel(&vpx, &vpy, &vpz, &pictview, pp);
128     if (vpz <= FTINY || vpx < 0. || vpx >= 1. || vpy < 0. || vpy >= 1.)
129     return(-1.0);
130     colr_color(res, getpictscan((int)(vpy*pysiz))[(int)(vpx*pxsiz)]);
131     return(luminance(res)/exposure);
132     }
133    
134    
135     double
136     getviewpix(vh, vv) /* compute single view pixel */
137     int vh, vv;
138     {
139     FVECT dir;
140     float rt_buf[6];
141     double res;
142    
143     if (compdir(dir, vh, vv) < 0)
144     return(-1.0);
145     if ((res = pict_val(dir)) >= 0.0)
146     return(res);
147     if (rt_pid == -1)
148     return(-1.0);
149     rt_buf[0] = ourview.vp[0];
150     rt_buf[1] = ourview.vp[1];
151     rt_buf[2] = ourview.vp[2];
152     rt_buf[3] = dir[0];
153     rt_buf[4] = dir[1];
154     rt_buf[5] = dir[2];
155     rt_compute(rt_buf, 1);
156     return(luminance(rt_buf));
157     }
158    
159    
160     getviewspan(vv, vb) /* compute a span of view pixels */
161     int vv;
162     float *vb;
163     {
164     float rt_buf[6*MAXPIX]; /* rtrace send/receive buffer */
165 greg 1.3 register int n; /* number of pixels in buffer */
166 greg 1.1 short buf_vh[MAXPIX]; /* pixel positions */
167     FVECT dir;
168     register int vh;
169    
170 greg 1.4 #ifdef DEBUG
171 greg 1.1 if (verbose)
172     fprintf(stderr, "%s: computing view span at %d...\n",
173     progname, vv);
174 greg 1.4 #endif
175 greg 1.3 n = 0;
176 greg 1.1 for (vh = -hsize; vh <= hsize; vh++) {
177     if (compdir(dir, vh, vv) < 0) { /* off viewable region */
178     vb[vh+hsize] = -1.0;
179     continue;
180     }
181     if ((vb[vh+hsize] = pict_val(dir)) >= 0.0)
182     continue;
183     if (rt_pid == -1) /* missing information */
184     continue;
185     /* send to rtrace */
186 greg 1.3 if (n >= MAXPIX) { /* flush */
187     rt_compute(rt_buf, n);
188     while (n-- > 0)
189     vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n);
190 greg 1.1 }
191 greg 1.3 rt_buf[6*n] = ourview.vp[0];
192     rt_buf[6*n+1] = ourview.vp[1];
193     rt_buf[6*n+2] = ourview.vp[2];
194     rt_buf[6*n+3] = dir[0];
195     rt_buf[6*n+4] = dir[1];
196     rt_buf[6*n+5] = dir[2];
197     buf_vh[n++] = vh;
198 greg 1.1 }
199 greg 1.4 #ifdef DEBUG
200 greg 1.2 if (verbose)
201     pict_stats();
202 greg 1.4 #endif
203 greg 1.3 if (n > 0) { /* process pending buffer */
204     rt_compute(rt_buf, n);
205     while (n-- > 0)
206     vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n);
207     }
208 greg 1.1 }
209    
210    
211     rt_compute(pb, np) /* process buffer through rtrace */
212     float *pb;
213     int np;
214     {
215     static float nbuf[6] = {0.,0.,0.,0.,0.,0.};
216    
217 greg 1.4 #ifdef DEBUG
218 greg 1.1 if (verbose && np > 1)
219     fprintf(stderr, "%s: sending %d samples to rtrace...\n",
220     progname, np);
221 greg 1.4 #endif
222 greg 1.1 if (writebuf(fd_tort,(char *)pb,6*sizeof(float)*np) < 6*sizeof(float)*np
223     || writebuf(fd_tort,(char *)nbuf,sizeof(nbuf)) < sizeof(nbuf)) {
224     fprintf(stderr, "%s: error writing to rtrace process\n",
225     progname);
226     exit(1);
227     }
228     if (readbuf(fd_fromrt, (char *)pb, 3*sizeof(float)*np)
229     < 3*sizeof(float)*np) {
230     fprintf(stderr, "%s: error reading from rtrace process\n",
231     progname);
232     exit(1);
233     }
234     }
235    
236    
237     getexpos(s) /* get exposure from header line */
238     char *s;
239     {
240     if (isexpos(s))
241     exposure *= exposval(s);
242     }
243    
244    
245     open_pict(fn) /* open picture file */
246     char *fn;
247     {
248     register int i;
249    
250     if ((pictfp = fopen(fn, "r")) == NULL) {
251     fprintf("%s: cannot open\n", fn);
252     exit(1);
253     }
254     exposure = 1.0;
255     getheader(pictfp, getexpos);
256     if (fgetresolu(&pxsiz, &pysiz, pictfp) != (YMAJOR|YDECR)) {
257     fprintf("%s: bad picture resolution\n", fn);
258     exit(1);
259     }
260     scanpos = (long *)malloc(pysiz*sizeof(long));
261     if (scanpos == NULL)
262     memerr("scanline positions");
263 greg 1.5 for (i = pysiz-1; i >= 0; i--)
264 greg 1.1 scanpos[i] = -1L;
265 greg 1.5 curpos = pysiz-1;
266 greg 1.1 for (i = 0; i < NSCANS; i++) {
267     scan[i].lused = -1;
268     scan[i].y = -1;
269     scan[i].sl = (COLR *)malloc(pxsiz*sizeof(COLR));
270     if (scan[i].sl == NULL)
271     memerr("scanline buffers");
272     }
273     }
274    
275    
276     close_pict() /* done with picture */
277     {
278     register int i;
279    
280     if (pictfp == NULL)
281     return;
282     fclose(pictfp);
283     free((char *)scanpos);
284     for (i = 0; i < NSCANS; i++)
285     free((char *)scan[i].sl);
286     pictfp = NULL;
287     }
288    
289    
290     fork_rtrace(av) /* open pipe and start rtrace */
291     char *av[];
292     {
293     int p0[2], p1[2];
294    
295     if (pipe(p0) < 0 || pipe(p1) < 0) {
296     perror(progname);
297     exit(1);
298     }
299     if ((rt_pid = vfork()) == 0) { /* if child */
300     close(p0[1]);
301     close(p1[0]);
302     if (p0[0] != 0) { /* connect p0 to stdin */
303     dup2(p0[0], 0);
304     close(p0[0]);
305     }
306     if (p1[1] != 0) { /* connect p1 to stdout */
307     dup2(p1[1], 1);
308     close(p1[1]);
309     }
310     execvp(av[0], av);
311     perror(av[0]);
312     _exit(127);
313     }
314     if (rt_pid == -1) {
315     perror(progname);
316     exit(1);
317     }
318 greg 1.3 close(p0[0]);
319     close(p1[1]);
320 greg 1.1 fd_tort = p0[1];
321     fd_fromrt = p1[0];
322     }
323    
324    
325     done_rtrace() /* wait for rtrace to finish */
326     {
327     int pid, status;
328    
329     if (rt_pid == -1)
330     return;
331     close(fd_tort);
332     close(fd_fromrt);
333     while ((pid = wait(&status)) != -1 && pid != rt_pid)
334     ;
335     if (pid == rt_pid && status != 0) {
336     fprintf(stderr, "%s: bad status (%d) from rtrace\n",
337     progname, status);
338     exit(1);
339     }
340     rt_pid = -1;
341     }
342    
343    
344     int
345     readbuf(fd, bpos, siz)
346     int fd;
347     char *bpos;
348     int siz;
349     {
350     register int cc, nrem = siz;
351    
352     while (nrem > 0 && (cc = read(fd, bpos, nrem)) > 0) {
353     bpos += cc;
354     nrem -= cc;
355     }
356     if (cc < 0)
357     return(cc);
358     return(siz-nrem);
359     }
360    
361    
362     int
363     writebuf(fd, bpos, siz)
364     char *bpos;
365     int siz;
366     {
367     register int cc, nrem = siz;
368    
369     while (nrem > 0 && (cc = write(fd, bpos, nrem)) > 0) {
370     bpos += cc;
371     nrem -= cc;
372     }
373     if (cc < 0)
374     return(cc);
375     return(siz-nrem);
376     }