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/* Copyright (c) 1991 Regents of the University of California */ |
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|
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#ifndef lint |
| 4 |
static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
| 6 |
|
| 7 |
/* |
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* Compute pixels for glare calculation |
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*/ |
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|
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#include "glare.h" |
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#include "resolu.h" |
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/* maximum rtrace buffer size */ |
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#define MAXPIX (4096/(6*sizeof(float))) |
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|
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#define MAXSBUF 786432 /* maximum total size of scanline buffer */ |
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#define HSIZE 317 /* size of scanline hash table */ |
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#define NRETIRE 16 /* number of scanlines to retire at once */ |
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|
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int rt_pd[3] = {-1,-1,-1}; /* process id & descriptors for rtrace */ |
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|
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FILE *pictfp = NULL; /* picture file pointer */ |
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double exposure; /* picture exposure */ |
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int pxsiz, pysiz; /* picture dimensions */ |
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|
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static int curpos; /* current scanline */ |
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static long *scanpos; /* scanline positions */ |
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|
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typedef struct scan { |
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int y; /* scanline position */ |
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long lused; /* for LRU replacement */ |
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struct scan *next; /* next in this hash or free list */ |
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/* followed by the scanline data */ |
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} SCAN; /* buffered scanline */ |
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|
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#define scandata(sl) ((COLR *)((sl)+1)) |
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#define shash(y) ((y)%HSIZE) |
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|
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static int maxpix; /* maximum number of pixels to buffer */ |
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|
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static SCAN *freelist; /* scanline free list */ |
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static SCAN *hashtab[HSIZE]; /* scanline hash table */ |
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|
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static long scanbufsiz; /* size of allocated scanline buffer */ |
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|
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static long ncall = 0L; /* number of calls to getpictscan */ |
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static long nread = 0L; /* number of scanlines read */ |
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static long nrecl = 0L; /* number of scanlines reclaimed */ |
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|
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static int wrongformat = 0; |
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|
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SCAN *scanretire(); |
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|
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extern long ftell(); |
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|
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|
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SCAN * |
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claimscan(y) /* claim scanline from buffers */ |
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int y; |
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{ |
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int hi = shash(y); |
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SCAN *slast; |
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register SCAN *sl; |
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|
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for (sl = hashtab[hi]; sl != NULL; sl = sl->next) |
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if (sl->y == y) /* active scanline */ |
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return(sl); |
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for (slast = NULL, sl = freelist; sl != NULL; slast = sl, sl = sl->next) |
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if (sl->y == -1 || sl->y == y || sl->next == NULL) { |
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if (slast == NULL) /* remove from free */ |
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freelist = sl->next; |
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else |
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slast->next = sl->next; |
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if (sl->y == y) { /* reclaim */ |
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sl->next = hashtab[hi]; |
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hashtab[hi] = sl; |
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nrecl++; |
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} |
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return(sl); |
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} |
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return(scanretire()); /* need more free scanlines */ |
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} |
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|
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|
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COLR * |
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getpictscan(y) /* get picture scanline */ |
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int y; |
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{ |
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register SCAN *sl; |
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register int i; |
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/* first check our buffers */ |
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sl = claimscan(y); |
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if (sl == NULL) |
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memerr("claimscan()"); |
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sl->lused = ncall++; |
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if (sl->y == y) /* scan hit */ |
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return(scandata(sl)); |
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/* else read in replacement */ |
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if (scanpos[y] < 0) { /* need to search */ |
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for (i = y+1; i < curpos; i++) |
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if (scanpos[i] >= 0) { |
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if (fseek(pictfp, scanpos[i], 0) < 0) |
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goto seekerr; |
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curpos = i; |
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break; |
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} |
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while (curpos >= y) { |
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scanpos[curpos] = ftell(pictfp); |
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if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0) |
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goto readerr; |
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nread++; |
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curpos--; |
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} |
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} else { |
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if (curpos != y && fseek(pictfp, scanpos[y], 0) < 0) |
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goto seekerr; |
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if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0) |
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goto readerr; |
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nread++; |
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curpos = y-1; |
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} |
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sl->y = y; |
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i = shash(y); /* add to hash list */ |
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sl->next = hashtab[i]; |
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hashtab[i] = sl; |
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return(scandata(sl)); |
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readerr: |
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fprintf(stderr, "%s: picture read error\n", progname); |
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exit(1); |
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seekerr: |
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fprintf(stderr, "%s: picture seek error\n", progname); |
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exit(1); |
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} |
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|
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|
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#ifdef DEBUG |
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pict_stats() /* print out picture read statistics */ |
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{ |
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static long lastcall = 0L; /* ncall at last report */ |
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static long lastread = 0L; /* nread at last report */ |
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static long lastrecl = 0L; /* nrecl at last report */ |
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|
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if (ncall == lastcall) |
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return; |
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fprintf(stderr, "%s: %ld scanlines read (%ld reclaimed) in %ld calls\n", |
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progname, nread-lastread, nrecl-lastrecl, ncall-lastcall); |
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lastcall = ncall; |
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lastread = nread; |
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lastrecl = nrecl; |
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} |
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#endif |
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|
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|
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double |
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pict_val(vd) /* find picture value for view direction */ |
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FVECT vd; |
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{ |
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FVECT pp; |
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FVECT ip; |
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COLOR res; |
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|
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if (pictfp == NULL) |
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return(-1.0); |
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pp[0] = pictview.vp[0] + vd[0]; |
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pp[1] = pictview.vp[1] + vd[1]; |
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pp[2] = pictview.vp[2] + vd[2]; |
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viewloc(ip, &pictview, pp); |
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if (ip[2] <= FTINY || ip[0] < 0. || ip[0] >= 1. || |
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ip[1] < 0. || ip[1] >= 1.) |
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return(-1.0); |
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colr_color(res, getpictscan((int)(ip[1]*pysiz))[(int)(ip[0]*pxsiz)]); |
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return(luminance(res)/exposure); |
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} |
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|
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|
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double |
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getviewpix(vh, vv) /* compute single view pixel */ |
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int vh, vv; |
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{ |
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FVECT dir; |
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float rt_buf[12]; |
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double res; |
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|
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if (compdir(dir, vh, vv) < 0) |
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return(-1.0); |
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npixinvw++; |
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if ((res = pict_val(dir)) >= 0.0) |
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return(res); |
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if (rt_pd[0] == -1) { |
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npixmiss++; |
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return(-1.0); |
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} |
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rt_buf[0] = ourview.vp[0]; |
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rt_buf[1] = ourview.vp[1]; |
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rt_buf[2] = ourview.vp[2]; |
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rt_buf[3] = dir[0]; |
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rt_buf[4] = dir[1]; |
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rt_buf[5] = dir[2]; |
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rt_compute(rt_buf, 1); |
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return(luminance(rt_buf)); |
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} |
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|
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|
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getviewspan(vv, vb) /* compute a span of view pixels */ |
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int vv; |
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float *vb; |
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{ |
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float rt_buf[6*MAXPIX]; /* rtrace send/receive buffer */ |
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register int n; /* number of pixels in buffer */ |
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short buf_vh[MAXPIX]; /* pixel positions */ |
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FVECT dir; |
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register int vh; |
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|
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#ifdef DEBUG |
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if (verbose) |
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fprintf(stderr, "%s: computing view span at %d...\n", |
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progname, vv); |
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#endif |
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n = 0; |
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for (vh = -hsize; vh <= hsize; vh++) { |
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if (compdir(dir, vh, vv) < 0) { /* not in view */ |
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vb[vh+hsize] = -1.0; |
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continue; |
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} |
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npixinvw++; |
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if ((vb[vh+hsize] = pict_val(dir)) >= 0.0) |
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continue; |
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if (rt_pd[0] == -1) { /* missing information */ |
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npixmiss++; |
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continue; |
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} |
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/* send to rtrace */ |
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if (n >= maxpix) { /* flush */ |
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rt_compute(rt_buf, n); |
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while (n-- > 0) |
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vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n); |
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} |
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rt_buf[6*n] = ourview.vp[0]; |
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rt_buf[6*n+1] = ourview.vp[1]; |
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rt_buf[6*n+2] = ourview.vp[2]; |
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rt_buf[6*n+3] = dir[0]; |
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rt_buf[6*n+4] = dir[1]; |
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rt_buf[6*n+5] = dir[2]; |
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buf_vh[n++] = vh; |
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} |
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#ifdef DEBUG |
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if (verbose) |
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pict_stats(); |
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#endif |
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if (n > 0) { /* process pending buffer */ |
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rt_compute(rt_buf, n); |
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while (n-- > 0) |
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vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n); |
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} |
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} |
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|
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|
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rt_compute(pb, np) /* process buffer through rtrace */ |
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float *pb; |
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int np; |
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{ |
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#ifdef DEBUG |
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if (verbose && np > 1) |
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fprintf(stderr, "%s: sending %d samples to rtrace...\n", |
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progname, np); |
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#endif |
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bzero(pb+6*np, 6*sizeof(float)); |
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if (process(rt_pd, pb, pb, 3*sizeof(float)*(np+1), |
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6*sizeof(float)*(np+1)) < 3*sizeof(float)*(np+1)) { |
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fprintf(stderr, "%s: rtrace communication error\n", |
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progname); |
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exit(1); |
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} |
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} |
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|
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|
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int |
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getexpos(s) /* get exposure from header line */ |
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char *s; |
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{ |
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char fmt[32]; |
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|
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if (isexpos(s)) |
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exposure *= exposval(s); |
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else if (isformat(s)) { |
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formatval(fmt, s); |
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wrongformat = strcmp(fmt, COLRFMT); |
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} |
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return(0); |
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} |
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|
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|
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open_pict(fn) /* open picture file */ |
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char *fn; |
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{ |
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if ((pictfp = fopen(fn, "r")) == NULL) { |
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fprintf(stderr, "%s: cannot open\n", fn); |
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exit(1); |
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} |
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exposure = 1.0; |
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getheader(pictfp, getexpos, NULL); |
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if (wrongformat || !fscnresolu(&pxsiz, &pysiz, pictfp)) { |
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fprintf(stderr, "%s: incompatible picture format\n", fn); |
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exit(1); |
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} |
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initscans(); |
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} |
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|
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|
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close_pict() /* done with picture */ |
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{ |
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if (pictfp == NULL) |
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return; |
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fclose(pictfp); |
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donescans(); |
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pictfp = NULL; |
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} |
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|
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|
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fork_rtrace(av) /* open pipe and start rtrace */ |
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char *av[]; |
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{ |
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int rval; |
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|
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rval = open_process(rt_pd, av); |
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if (rval < 0) { |
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perror(progname); |
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exit(1); |
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} |
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if (rval == 0) { |
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fprintf(stderr, "%s: command not found\n", av[0]); |
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exit(1); |
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} |
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maxpix = rval/(6*sizeof(float)); |
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if (maxpix > MAXPIX) |
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maxpix = MAXPIX; |
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maxpix--; |
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} |
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|
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|
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done_rtrace() /* wait for rtrace to finish */ |
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{ |
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int status; |
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|
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status = close_process(rt_pd); |
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if (status > 0) { |
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fprintf(stderr, "%s: bad status (%d) from rtrace\n", |
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progname, status); |
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exit(1); |
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} |
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rt_pd[0] = -1; |
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} |
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|
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|
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SCAN * |
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scanretire() /* retire old scanlines to free list */ |
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{ |
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SCAN *sold[NRETIRE]; |
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int n; |
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int h; |
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register SCAN *sl; |
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register int i; |
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/* grab the NRETIRE oldest scanlines */ |
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sold[n = 0] = NULL; |
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for (h = 0; h < HSIZE; h++) |
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for (sl = hashtab[h]; sl != NULL; sl = sl->next) { |
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for (i = n; i && sold[i-1]->lused > sl->lused; i--) |
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if (i < NRETIRE) |
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sold[i] = sold[i-1]; |
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if (i < NRETIRE) { |
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sold[i] = sl; |
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if (n < NRETIRE) /* grow list */ |
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n++; |
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} |
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} |
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/* put scanlines into free list */ |
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for (i = 0; i < n; i++) { |
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h = shash(sold[i]->y); |
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sl = hashtab[h]; |
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if (sl == sold[i]) |
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hashtab[h] = sl->next; |
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else { |
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while (sl->next != sold[i]) /* IS in list */ |
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sl = sl->next; |
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sl->next = sold[i]->next; |
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} |
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if (i > 0) { /* save oldest as return value */ |
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sold[i]->next = freelist; |
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freelist = sold[i]; |
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} |
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} |
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return(sold[0]); |
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} |
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|
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|
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static char *scan_buf; |
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|
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|
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initscans() /* initialize scanline buffers */ |
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{ |
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int scansize; |
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register SCAN *ptr; |
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register int i; |
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/* initialize positions */ |
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scanpos = (long *)bmalloc(pysiz*sizeof(long)); |
| 406 |
if (scanpos == NULL) |
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memerr("scanline positions"); |
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for (i = pysiz-1; i >= 0; i--) |
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scanpos[i] = -1L; |
| 410 |
curpos = pysiz-1; |
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/* clear hash table */ |
| 412 |
for (i = 0; i < HSIZE; i++) |
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hashtab[i] = NULL; |
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/* allocate scanline buffers */ |
| 415 |
scansize = sizeof(SCAN) + pxsiz*sizeof(COLR); |
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#ifdef ALIGN |
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scansize = scansize+(sizeof(ALIGN)-1) & ~(sizeof(ALIGN)-1); |
| 418 |
#endif |
| 419 |
i = MAXSBUF / scansize; /* compute number to allocate */ |
| 420 |
if (i > HSIZE) |
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i = HSIZE; |
| 422 |
scanbufsiz = i*scansize; |
| 423 |
scan_buf = bmalloc(scanbufsiz); /* get in one big chunk */ |
| 424 |
if (scan_buf == NULL) |
| 425 |
memerr("scanline buffers"); |
| 426 |
ptr = (SCAN *)scan_buf; |
| 427 |
freelist = NULL; /* build our free list */ |
| 428 |
while (i-- > 0) { |
| 429 |
ptr->y = -1; |
| 430 |
ptr->lused = -1; |
| 431 |
ptr->next = freelist; |
| 432 |
freelist = ptr; |
| 433 |
ptr = (SCAN *)((char *)ptr + scansize); /* beware of C bugs */ |
| 434 |
} |
| 435 |
} |
| 436 |
|
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|
| 438 |
donescans() /* free up scanlines */ |
| 439 |
{ |
| 440 |
bfree(scan_buf, scanbufsiz); |
| 441 |
bfree((char *)scanpos, pysiz*sizeof(long)); |
| 442 |
} |
