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/* Copyright (c) 1986 Regents of the University of California */ |
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/* Copyright (c) 1991 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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/* |
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* ambient.c - routines dealing with ambient (inter-reflected) component. |
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* |
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* The macro AMBFLUSH (if defined) is the number of ambient values |
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* to wait before flushing to the ambient file. |
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* |
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* 5/9/86 |
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*/ |
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#include "otypes.h" |
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|
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#include "ambient.h" |
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|
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#include "random.h" |
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|
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#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ |
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|
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typedef struct ambtree { |
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AMBVAL *alist; /* ambient value list */ |
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struct ambtree *kid; /* 8 child nodes */ |
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} AMBTREE; /* ambient octree */ |
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|
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extern CUBE thescene; /* contains space boundaries */ |
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|
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extern COLOR ambval; /* global ambient component */ |
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extern double ambacc; /* ambient accuracy */ |
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extern int ambres; /* ambient resolution */ |
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extern int ambdiv; /* number of divisions for calculation */ |
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extern int ambssamp; /* number of super-samples */ |
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extern int ambounce; /* number of ambient bounces */ |
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extern char *amblist[]; /* ambient include/exclude list */ |
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extern int ambincl; /* include == 1, exclude == 0 */ |
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|
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#define MAXASET 511 /* maximum number of elements in ambient set */ |
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OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
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|
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double maxarad; /* maximum ambient radius */ |
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double minarad; /* minimum ambient radius */ |
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|
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typedef struct ambval { |
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FVECT pos; /* position in space */ |
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FVECT dir; /* normal direction */ |
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int lvl; /* recursion level of parent ray */ |
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float weight; /* weight of parent ray */ |
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COLOR val; /* computed ambient value */ |
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float rad; /* validity radius */ |
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struct ambval *next; /* next in list */ |
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} AMBVAL; /* ambient value */ |
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|
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typedef struct ambtree { |
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AMBVAL *alist; /* ambient value list */ |
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struct ambtree *kid; /* 8 child nodes */ |
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} AMBTREE; /* ambient octree */ |
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|
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typedef struct { |
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float k; /* error contribution per sample */ |
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COLOR v; /* ray sum */ |
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int n; /* number of samples */ |
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short t, p; /* theta, phi indices */ |
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} AMBSAMP; /* ambient sample */ |
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|
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static AMBTREE atrunk; /* our ambient trunk node */ |
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|
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static FILE *ambfp = NULL; /* ambient file pointer */ |
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|
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#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
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|
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#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
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|
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#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
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|
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double sumambient(), doambient(), makeambient(); |
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extern long ftell(), lseek(); |
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static int initambfile(), avsave(), avinsert(), ambsync(); |
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|
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|
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setambres(ar) /* set ambient resolution */ |
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int ar; |
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{ |
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/* set min & max radii */ |
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if (ar <= 0) { |
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minarad = 0.0; |
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maxarad = thescene.cusize / 2.0; |
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} else { |
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minarad = thescene.cusize / ar; |
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maxarad = 16.0 * minarad; /* heuristic */ |
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if (maxarad > thescene.cusize / 2.0) |
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maxarad = thescene.cusize / 2.0; |
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} |
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if (maxarad <= FTINY) |
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maxarad = .001; |
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} |
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|
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|
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setambient(afile) /* initialize calculation */ |
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char *afile; |
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{ |
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long ftell(); |
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long headlen; |
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AMBVAL amb; |
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|
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maxarad = thescene.cusize / 2.0; /* maximum radius */ |
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/* minimum radius */ |
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minarad = ambres > 0 ? thescene.cusize/ambres : 0.0; |
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|
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/* open ambient file */ |
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/* init ambient limits */ |
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setambres(ambres); |
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/* open ambient file */ |
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if (afile != NULL) |
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if ((ambfp = fopen(afile, "r+")) != NULL) { |
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while (fread((char *)&amb,sizeof(AMBVAL),1,ambfp) == 1) |
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initambfile(0); |
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headlen = ftell(ambfp); |
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while (readambval(&amb, ambfp)) |
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avinsert(&amb, &atrunk, thescene.cuorg, |
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thescene.cusize); |
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/* align */ |
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fseek(ambfp, -(ftell(ambfp)%sizeof(AMBVAL)), 1); |
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} else if ((ambfp = fopen(afile, "w")) == NULL) { |
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fseek(ambfp, -((ftell(ambfp)-headlen)%AMBVALSIZ), 1); |
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} else if ((ambfp = fopen(afile, "w+")) != NULL) |
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initambfile(1); |
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else { |
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sprintf(errmsg, "cannot open ambient file \"%s\"", |
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afile); |
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error(SYSTEM, errmsg); |
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register RAY *r; |
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{ |
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static int rdepth = 0; /* ambient recursion */ |
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double wsum; |
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double d; |
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|
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rdepth++; /* increment level */ |
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|
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if (ambdiv <= 0) /* no ambient calculation */ |
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goto dumbamb; |
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/* check number of bounces */ |
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if (rdepth > ambounce) |
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if (rdepth >= ambounce) |
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goto dumbamb; |
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/* check ambient list */ |
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if (ambincl != -1 && r->ro != NULL && |
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goto dumbamb; |
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|
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if (ambacc <= FTINY) { /* no ambient storage */ |
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if (doambient(acol, r) == 0.0) |
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rdepth++; |
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d = doambient(acol, r, r->rweight, NULL, NULL); |
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rdepth--; |
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if (d == 0.0) |
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goto dumbamb; |
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goto done; |
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return; |
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} |
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/* get ambient value */ |
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setcolor(acol, 0.0, 0.0, 0.0); |
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wsum = sumambient(acol, r, &atrunk, thescene.cuorg, thescene.cusize); |
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if (wsum > FTINY) |
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scalecolor(acol, 1.0/wsum); |
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else if (makeambient(acol, r) == 0.0) |
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goto dumbamb; |
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goto done; |
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|
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d = sumambient(acol, r, rdepth, |
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&atrunk, thescene.cuorg, thescene.cusize); |
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if (d > FTINY) |
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scalecolor(acol, 1.0/d); |
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else { |
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d = makeambient(acol, r, rdepth++); |
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rdepth--; |
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} |
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if (d > FTINY) |
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return; |
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dumbamb: /* return global value */ |
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copycolor(acol, ambval); |
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done: /* must finish here! */ |
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rdepth--; |
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} |
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double |
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sumambient(acol, r, at, c0, s) /* get interpolated ambient value */ |
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sumambient(acol, r, al, at, c0, s) /* get interpolated ambient value */ |
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COLOR acol; |
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register RAY *r; |
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int al; |
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AMBTREE *at; |
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FVECT c0; |
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double s; |
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wsum = 0.0; |
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for (av = at->alist; av != NULL; av = av->next) { |
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/* |
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* Ray strength test. |
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* Ambient level test. |
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*/ |
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if (av->lvl > r->rlvl || av->weight < r->rweight-FTINY) |
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if (av->lvl > al || av->weight < r->rweight-FTINY) |
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continue; |
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/* |
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* Ambient radius test. |
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for (j = 0; j < 3; j++) |
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d += (r->rop[j] - av->pos[j]) * |
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(av->dir[j] + r->ron[j]); |
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if (d < -minarad) |
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if (d*0.5 < -minarad*ambacc-.001) |
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continue; |
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/* |
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* Jittering final test reduces image artifacts. |
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*/ |
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wt = sqrt(e1) + sqrt(e2); |
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wt *= .9 + .2*frandom(); |
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> |
wt *= .9 + .2*urand(9015+samplendx); |
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if (wt > ambacc) |
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continue; |
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if (wt <= 1e-3) |
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else |
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wt = 1.0 / wt; |
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wsum += wt; |
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copycolor(ct, av->val); |
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extambient(ct, av, r->rop, r->ron); |
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scalecolor(ct, wt); |
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addcolor(acol, ct); |
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} |
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break; |
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} |
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if (j == 3) |
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wsum += sumambient(acol, r, at->kid+i, ck0, s); |
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wsum += sumambient(acol, r, al, at->kid+i, ck0, s); |
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} |
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return(wsum); |
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} |
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|
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double |
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makeambient(acol, r) /* make a new ambient value */ |
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> |
makeambient(acol, r, al) /* make a new ambient value */ |
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COLOR acol; |
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register RAY *r; |
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int al; |
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{ |
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AMBVAL amb; |
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< |
|
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< |
amb.rad = doambient(acol, r); /* compute ambient */ |
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> |
FVECT gp, gd; |
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> |
/* compute weight */ |
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> |
amb.weight = pow(AVGREFL, (double)al); |
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> |
if (r->rweight < 0.2*amb.weight) /* heuristic */ |
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> |
amb.weight = r->rweight; |
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> |
/* compute ambient */ |
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> |
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
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if (amb.rad == 0.0) |
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return(0.0); |
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/* store it */ |
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VCOPY(amb.pos, r->rop); |
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VCOPY(amb.dir, r->ron); |
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amb.lvl = r->rlvl; |
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< |
amb.weight = r->rweight; |
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> |
amb.lvl = al; |
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copycolor(amb.val, acol); |
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VCOPY(amb.gpos, gp); |
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VCOPY(amb.gdir, gd); |
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/* insert into tree */ |
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< |
avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize); |
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< |
avsave(&amb); /* write to file */ |
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> |
avsave(&amb); /* and save to file */ |
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return(amb.rad); |
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} |
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|
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< |
double |
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< |
doambient(acol, r) /* compute ambient component */ |
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< |
COLOR acol; |
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< |
register RAY *r; |
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> |
extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
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> |
COLOR cr; |
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> |
register AMBVAL *ap; |
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> |
FVECT pv, nv; |
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{ |
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< |
extern int ambcmp(); |
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< |
extern double sin(), cos(), sqrt(); |
| 285 |
< |
int hlist[4]; |
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< |
double phi, xd, yd, zd; |
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< |
double b, b2; |
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< |
register AMBSAMP *div; |
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< |
AMBSAMP dnew; |
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< |
RAY ar; |
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< |
FVECT ux, uy; |
| 288 |
< |
double arad; |
| 289 |
< |
int ndivs, nt, np, ns, ne, i, j; |
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< |
register int k; |
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> |
FVECT v1, v2; |
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> |
register int i; |
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> |
double d; |
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|
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< |
setcolor(acol, 0.0, 0.0, 0.0); |
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< |
/* set number of divisions */ |
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< |
nt = sqrt(ambdiv * r->rweight * 0.5) + 0.5; |
| 290 |
< |
np = 2 * nt; |
| 291 |
< |
ndivs = nt * np; |
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< |
/* check first */ |
| 293 |
< |
if (ndivs == 0 || rayorigin(&ar, r, AMBIENT, 0.5) < 0) |
| 294 |
< |
return(0.0); |
| 295 |
< |
/* set number of super-samples */ |
| 296 |
< |
ns = ambssamp * r->rweight + 0.5; |
| 297 |
< |
if (ns > 0) { |
| 303 |
< |
div = (AMBSAMP *)malloc(ndivs*sizeof(AMBSAMP)); |
| 304 |
< |
if (div == NULL) |
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< |
error(SYSTEM, "out of memory in doambient"); |
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> |
d = 1.0; /* zeroeth order */ |
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> |
/* gradient due to translation */ |
| 289 |
> |
for (i = 0; i < 3; i++) |
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> |
d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
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> |
/* gradient due to rotation */ |
| 292 |
> |
VCOPY(v1, ap->dir); |
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> |
fcross(v2, v1, nv); |
| 294 |
> |
d += DOT(ap->gdir, v2); |
| 295 |
> |
if (d <= 0.0) { |
| 296 |
> |
setcolor(cr, 0.0, 0.0, 0.0); |
| 297 |
> |
return; |
| 298 |
|
} |
| 299 |
< |
/* make axes */ |
| 300 |
< |
uy[0] = uy[1] = uy[2] = 0.0; |
| 309 |
< |
for (k = 0; k < 3; k++) |
| 310 |
< |
if (r->ron[k] < 0.6 && r->ron[k] > -0.6) |
| 311 |
< |
break; |
| 312 |
< |
uy[k] = 1.0; |
| 313 |
< |
fcross(ux, r->ron, uy); |
| 314 |
< |
normalize(ux); |
| 315 |
< |
fcross(uy, ux, r->ron); |
| 316 |
< |
/* set up urand */ |
| 317 |
< |
hlist[0] = r->rno; |
| 318 |
< |
/* sample divisions */ |
| 319 |
< |
arad = 0.0; |
| 320 |
< |
ne = 0; |
| 321 |
< |
for (i = 0; i < nt; i++) { |
| 322 |
< |
hlist[1] = i; |
| 323 |
< |
for (j = 0; j < np; j++) { |
| 324 |
< |
rayorigin(&ar, r, AMBIENT, 0.5); /* pretested */ |
| 325 |
< |
hlist[2] = j; |
| 326 |
< |
hlist[3] = 0; |
| 327 |
< |
zd = sqrt((i+urand(ilhash(hlist,4)))/nt); |
| 328 |
< |
hlist[3] = 1; |
| 329 |
< |
phi = 2.0*PI * (j+urand(ilhash(hlist,4)))/np; |
| 330 |
< |
xd = cos(phi) * zd; |
| 331 |
< |
yd = sin(phi) * zd; |
| 332 |
< |
zd = sqrt(1.0 - zd*zd); |
| 333 |
< |
for (k = 0; k < 3; k++) |
| 334 |
< |
ar.rdir[k] = xd*ux[k]+yd*uy[k]+zd*r->ron[k]; |
| 335 |
< |
dimlist[ndims++] = i*np + j + 38813; |
| 336 |
< |
rayvalue(&ar); |
| 337 |
< |
ndims--; |
| 338 |
< |
if (ar.rot < FHUGE) |
| 339 |
< |
arad += 1.0 / ar.rot; |
| 340 |
< |
if (ns > 0) { /* save division */ |
| 341 |
< |
div[ne].k = 0.0; |
| 342 |
< |
copycolor(div[ne].v, ar.rcol); |
| 343 |
< |
div[ne].n = 0; |
| 344 |
< |
div[ne].t = i; div[ne].p = j; |
| 345 |
< |
/* sum errors */ |
| 346 |
< |
b = bright(ar.rcol); |
| 347 |
< |
if (i > 0) { /* from above */ |
| 348 |
< |
b2 = bright(div[ne-np].v) - b; |
| 349 |
< |
b2 *= b2 * 0.25; |
| 350 |
< |
div[ne].k += b2; |
| 351 |
< |
div[ne].n++; |
| 352 |
< |
div[ne-np].k += b2; |
| 353 |
< |
div[ne-np].n++; |
| 354 |
< |
} |
| 355 |
< |
if (j > 0) { /* from behind */ |
| 356 |
< |
b2 = bright(div[ne-1].v) - b; |
| 357 |
< |
b2 *= b2 * 0.25; |
| 358 |
< |
div[ne].k += b2; |
| 359 |
< |
div[ne].n++; |
| 360 |
< |
div[ne-1].k += b2; |
| 361 |
< |
div[ne-1].n++; |
| 362 |
< |
} |
| 363 |
< |
if (j == np-1) { /* around */ |
| 364 |
< |
b2 = bright(div[ne-(np-1)].v) - b; |
| 365 |
< |
b2 *= b2 * 0.25; |
| 366 |
< |
div[ne].k += b2; |
| 367 |
< |
div[ne].n++; |
| 368 |
< |
div[ne-(np-1)].k += b2; |
| 369 |
< |
div[ne-(np-1)].n++; |
| 370 |
< |
} |
| 371 |
< |
ne++; |
| 372 |
< |
} else |
| 373 |
< |
addcolor(acol, ar.rcol); |
| 374 |
< |
} |
| 375 |
< |
} |
| 376 |
< |
for (k = 0; k < ne; k++) { /* compute errors */ |
| 377 |
< |
if (div[k].n > 1) |
| 378 |
< |
div[k].k /= div[k].n; |
| 379 |
< |
div[k].n = 1; |
| 380 |
< |
} |
| 381 |
< |
/* sort the divisions */ |
| 382 |
< |
qsort(div, ne, sizeof(AMBSAMP), ambcmp); |
| 383 |
< |
/* skim excess */ |
| 384 |
< |
while (ne > ns) { |
| 385 |
< |
ne--; |
| 386 |
< |
addcolor(acol, div[ne].v); |
| 387 |
< |
} |
| 388 |
< |
/* super-sample */ |
| 389 |
< |
for (i = ns; i > 0; i--) { |
| 390 |
< |
rayorigin(&ar, r, AMBIENT, 0.5); /* pretested */ |
| 391 |
< |
hlist[1] = div[0].t; |
| 392 |
< |
hlist[2] = div[0].p; |
| 393 |
< |
hlist[3] = 0; |
| 394 |
< |
zd = sqrt((div[0].t+urand(ilhash(hlist,4)+div[0].n))/nt); |
| 395 |
< |
hlist[3] = 1; |
| 396 |
< |
phi = 2.0*PI * (div[0].p+urand(ilhash(hlist,4)+div[0].n))/np; |
| 397 |
< |
xd = cos(phi) * zd; |
| 398 |
< |
yd = sin(phi) * zd; |
| 399 |
< |
zd = sqrt(1.0 - zd*zd); |
| 400 |
< |
for (k = 0; k < 3; k++) |
| 401 |
< |
ar.rdir[k] = xd*ux[k]+yd*uy[k]+zd*r->ron[k]; |
| 402 |
< |
dimlist[ndims++] = div[0].t*np + div[0].p + 38813; |
| 403 |
< |
rayvalue(&ar); |
| 404 |
< |
ndims--; |
| 405 |
< |
rayvalue(&ar); |
| 406 |
< |
if (ar.rot < FHUGE) |
| 407 |
< |
arad += 1.0 / ar.rot; |
| 408 |
< |
/* recompute error */ |
| 409 |
< |
copycolor(dnew.v, div[0].v); |
| 410 |
< |
addcolor(dnew.v, ar.rcol); |
| 411 |
< |
dnew.n = div[0].n + 1; |
| 412 |
< |
dnew.t = div[0].t; dnew.p = div[0].p; |
| 413 |
< |
b2 = bright(dnew.v)/dnew.n - bright(ar.rcol); |
| 414 |
< |
b2 = b2*b2 + div[0].k*(div[0].n*div[0].n); |
| 415 |
< |
dnew.k = b2/(dnew.n*dnew.n); |
| 416 |
< |
/* reinsert */ |
| 417 |
< |
for (k = 0; k < ne-1 && dnew.k < div[k+1].k; k++) |
| 418 |
< |
copystruct(&div[k], &div[k+1]); |
| 419 |
< |
copystruct(&div[k], &dnew); |
| 420 |
< |
|
| 421 |
< |
if (ne >= i) { /* extract darkest division */ |
| 422 |
< |
ne--; |
| 423 |
< |
if (div[ne].n > 1) |
| 424 |
< |
scalecolor(div[ne].v, 1.0/div[ne].n); |
| 425 |
< |
addcolor(acol, div[ne].v); |
| 426 |
< |
} |
| 427 |
< |
} |
| 428 |
< |
scalecolor(acol, 1.0/ndivs); |
| 429 |
< |
if (arad <= FTINY) |
| 430 |
< |
arad = FHUGE; |
| 431 |
< |
else |
| 432 |
< |
arad = (ndivs+ns) / arad / sqrt(r->rweight); |
| 433 |
< |
if (arad > maxarad) |
| 434 |
< |
arad = maxarad; |
| 435 |
< |
else if (arad < minarad) |
| 436 |
< |
arad = minarad; |
| 437 |
< |
if (ns > 0) |
| 438 |
< |
free((char *)div); |
| 439 |
< |
return(arad); |
| 299 |
> |
copycolor(cr, ap->val); |
| 300 |
> |
scalecolor(cr, d); |
| 301 |
|
} |
| 302 |
|
|
| 303 |
|
|
| 304 |
< |
static int |
| 305 |
< |
ambcmp(d1, d2) /* decreasing order */ |
| 306 |
< |
AMBSAMP *d1, *d2; |
| 304 |
> |
static |
| 305 |
> |
initambfile(creat) /* initialize ambient file */ |
| 306 |
> |
int creat; |
| 307 |
|
{ |
| 308 |
< |
if (d1->k < d2->k) |
| 309 |
< |
return(1); |
| 310 |
< |
if (d1->k > d2->k) |
| 311 |
< |
return(-1); |
| 312 |
< |
return(0); |
| 308 |
> |
extern char *progname, *octname, VersionID[]; |
| 309 |
> |
|
| 310 |
> |
setbuf(ambfp, bmalloc(BUFSIZ)); |
| 311 |
> |
if (creat) { /* new file */ |
| 312 |
> |
fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ", |
| 313 |
> |
progname, colval(ambval,RED), |
| 314 |
> |
colval(ambval,GRN), colval(ambval,BLU), |
| 315 |
> |
ambounce, ambacc); |
| 316 |
> |
fprintf(ambfp, "-ad %d -as %d -ar %d %s\n", |
| 317 |
> |
ambdiv, ambssamp, ambres, |
| 318 |
> |
octname==NULL ? "" : octname); |
| 319 |
> |
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
| 320 |
> |
fputformat(AMBFMT, ambfp); |
| 321 |
> |
putc('\n', ambfp); |
| 322 |
> |
putambmagic(ambfp); |
| 323 |
> |
fflush(ambfp); |
| 324 |
> |
#ifndef NIX |
| 325 |
> |
sync(); /* protect against NFS buffering */ |
| 326 |
> |
#endif |
| 327 |
> |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
| 328 |
> |
error(USER, "bad ambient file"); |
| 329 |
|
} |
| 330 |
|
|
| 331 |
|
|
| 332 |
|
static |
| 333 |
< |
avsave(av) /* save an ambient value */ |
| 333 |
> |
avsave(av) /* insert and save an ambient value */ |
| 334 |
|
AMBVAL *av; |
| 335 |
|
{ |
| 459 |
– |
#ifdef AMBFLUSH |
| 336 |
|
static int nunflshed = 0; |
| 337 |
< |
#endif |
| 337 |
> |
|
| 338 |
> |
avinsert(av, &atrunk, thescene.cuorg, thescene.cusize); |
| 339 |
|
if (ambfp == NULL) |
| 340 |
|
return; |
| 341 |
< |
if (fwrite((char *)av, sizeof(AMBVAL), 1, ambfp) != 1) |
| 341 |
> |
if (writambval(av, ambfp) < 0) |
| 342 |
|
goto writerr; |
| 466 |
– |
#ifdef AMBFLUSH |
| 343 |
|
if (++nunflshed >= AMBFLUSH) { |
| 344 |
< |
if (fflush(ambfp) == EOF) |
| 344 |
> |
if (ambsync() == EOF) |
| 345 |
|
goto writerr; |
| 346 |
|
nunflshed = 0; |
| 347 |
|
} |
| 472 |
– |
#endif |
| 348 |
|
return; |
| 349 |
|
writerr: |
| 350 |
|
error(SYSTEM, "error writing ambient file"); |
| 386 |
|
memerr: |
| 387 |
|
error(SYSTEM, "out of memory in avinsert"); |
| 388 |
|
} |
| 389 |
+ |
|
| 390 |
+ |
|
| 391 |
+ |
#ifdef NIX |
| 392 |
+ |
|
| 393 |
+ |
static |
| 394 |
+ |
ambsync() /* flush ambient file */ |
| 395 |
+ |
{ |
| 396 |
+ |
return(fflush(ambfp)); |
| 397 |
+ |
} |
| 398 |
+ |
|
| 399 |
+ |
#else |
| 400 |
+ |
|
| 401 |
+ |
#include <fcntl.h> |
| 402 |
+ |
#include <sys/types.h> |
| 403 |
+ |
#include <sys/stat.h> |
| 404 |
+ |
|
| 405 |
+ |
static |
| 406 |
+ |
ambsync() /* synchronize ambient file */ |
| 407 |
+ |
{ |
| 408 |
+ |
static FILE *ambinp = NULL; |
| 409 |
+ |
struct flock fls; |
| 410 |
+ |
struct stat sts; |
| 411 |
+ |
AMBVAL avs; |
| 412 |
+ |
long lastpos, flen; |
| 413 |
+ |
register int n; |
| 414 |
+ |
/* gain exclusive access */ |
| 415 |
+ |
fls.l_type = F_WRLCK; |
| 416 |
+ |
fls.l_whence = 0; |
| 417 |
+ |
fls.l_start = 0L; |
| 418 |
+ |
fls.l_len = 0L; |
| 419 |
+ |
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
| 420 |
+ |
error(SYSTEM, "cannot lock ambient file"); |
| 421 |
+ |
/* see if file has grown */ |
| 422 |
+ |
lastpos = lseek(fileno(ambfp), 0L, 1); /* get previous position */ |
| 423 |
+ |
if (fstat(fileno(ambfp), &sts) < 0) /* get current length */ |
| 424 |
+ |
error(SYSTEM, "cannot stat ambient file"); |
| 425 |
+ |
flen = sts.st_size; |
| 426 |
+ |
if (n = (flen - lastpos)/AMBVALSIZ) { /* file has grown */ |
| 427 |
+ |
if (ambinp == NULL) /* use duplicate file */ |
| 428 |
+ |
ambinp = fdopen(dup(fileno(ambfp)), "r"); |
| 429 |
+ |
while (n--) { /* load contributed values */ |
| 430 |
+ |
readambval(&avs, ambinp); |
| 431 |
+ |
avinsert(&avs,&atrunk,thescene.cuorg,thescene.cusize); |
| 432 |
+ |
} /* moves shared file pointer */ |
| 433 |
+ |
if (n = (flen - lastpos)%AMBVALSIZ) /* alignment */ |
| 434 |
+ |
lseek(fileno(ambfp), flen-n, 0); |
| 435 |
+ |
} |
| 436 |
+ |
n = fflush(ambfp); /* calls write() at last */ |
| 437 |
+ |
fls.l_type = F_UNLCK; /* release file */ |
| 438 |
+ |
fcntl(fileno(ambfp), F_SETLKW, &fls); |
| 439 |
+ |
return(n); |
| 440 |
+ |
} |
| 441 |
+ |
|
| 442 |
+ |
#endif |
