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/* Copyright (c) 1991 Regents of the University of California */ |
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/* Copyright (c) 1992 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 "random.h" |
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#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ |
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#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ |
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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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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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extern CUBE thescene; /* contains space boundaries */ |
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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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#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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double maxarad; /* maximum ambient radius */ |
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double minarad; /* minimum ambient radius */ |
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static AMBTREE atrunk; /* our ambient trunk node */ |
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static AMBTREE atrunk; /* our ambient trunk node */ |
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static FILE *ambfp = NULL; /* ambient file pointer */ |
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#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
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#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
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#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
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#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
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#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
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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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setambient(afile) /* initialize calculation */ |
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char *afile; |
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{ |
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long ftell(); |
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AMBVAL amb; |
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long headlen; |
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AMBVAL amb; |
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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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ambnotify(obj) /* record new modifier */ |
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OBJECT obj; |
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OBJECT obj; |
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{ |
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static int hitlimit = 0; |
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register OBJREC *o = objptr(obj); |
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register OBJREC *o = objptr(obj); |
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register char **amblp; |
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if (hitlimit || !ismodifier(o->otype)) |
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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 d; |
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double d; |
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if (ambdiv <= 0) /* no ambient calculation */ |
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goto dumbamb; |
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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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AMBTREE *at; |
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FVECT c0; |
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double s; |
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double s; |
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{ |
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extern double sqrt(); |
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double d, e1, e2, wt, wsum; |
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double d, e1, e2, wt, wsum; |
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COLOR ct; |
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FVECT ck0; |
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int i; |
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register int j; |
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register AMBVAL *av; |
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register AMBVAL *av; |
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/* do this node */ |
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wsum = 0.0; |
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for (av = at->alist; av != NULL; av = av->next) { |
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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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AMBVAL amb; |
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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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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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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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register AMBVAL *ap; |
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FVECT pv, nv; |
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{ |
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FVECT v1, v2; |
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register int i; |
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double d; |
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double d; |
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d = 1.0; /* zeroeth order */ |
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/* gradient due to translation */ |
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static |
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avsave(av) /* save an ambient value */ |
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AMBVAL *av; |
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initambfile(creat) /* initialize ambient file */ |
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int creat; |
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{ |
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#ifdef AMBFLUSH |
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static int nunflshed = 0; |
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extern char *progname, *octname, VersionID[]; |
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|
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#ifdef MSDOS |
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setmode(fileno(ambfp), O_BINARY); |
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#endif |
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setbuf(ambfp, bmalloc(BUFSIZ)); |
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if (creat) { /* new file */ |
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fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ", |
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progname, colval(ambval,RED), |
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colval(ambval,GRN), colval(ambval,BLU), |
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ambounce, ambacc); |
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fprintf(ambfp, "-ad %d -as %d -ar %d %s\n", |
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ambdiv, ambssamp, ambres, |
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octname==NULL ? "" : octname); |
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fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
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fputformat(AMBFMT, ambfp); |
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putc('\n', ambfp); |
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putambmagic(ambfp); |
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fflush(ambfp); |
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#ifndef NIX |
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sync(); /* protect against NFS buffering */ |
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#endif |
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} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
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error(USER, "bad ambient file"); |
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} |
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|
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static |
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avsave(av) /* insert and save an ambient value */ |
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AMBVAL *av; |
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{ |
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static int nunflshed = 0; |
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|
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avinsert(av, &atrunk, thescene.cuorg, thescene.cusize); |
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if (ambfp == NULL) |
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return; |
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if (fwrite((char *)av, sizeof(AMBVAL), 1, ambfp) != 1) |
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if (writambval(av, ambfp) < 0) |
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goto writerr; |
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#ifdef AMBFLUSH |
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if (++nunflshed >= AMBFLUSH) { |
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if (fflush(ambfp) == EOF) |
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if (ambsync() == EOF) |
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goto writerr; |
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nunflshed = 0; |
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} |
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#endif |
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return; |
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writerr: |
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error(SYSTEM, "error writing ambient file"); |
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static |
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avinsert(aval, at, c0, s) /* insert ambient value in a tree */ |
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AMBVAL *aval; |
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AMBVAL *aval; |
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register AMBTREE *at; |
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FVECT c0; |
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double s; |
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double s; |
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{ |
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FVECT ck0; |
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int branch; |
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register AMBVAL *av; |
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register AMBVAL *av; |
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register int i; |
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if ((av = newambval()) == NULL) |
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memerr: |
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error(SYSTEM, "out of memory in avinsert"); |
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} |
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#ifdef NIX |
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|
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static |
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ambsync() /* flush ambient file */ |
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{ |
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return(fflush(ambfp)); |
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} |
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|
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#else |
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|
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#include <fcntl.h> |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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|
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static |
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ambsync() /* synchronize ambient file */ |
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{ |
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static FILE *ambinp = NULL; |
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struct flock fls; |
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struct stat sts; |
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AMBVAL avs; |
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long lastpos, flen; |
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register int n; |
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/* gain exclusive access */ |
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fls.l_type = F_WRLCK; |
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fls.l_whence = 0; |
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fls.l_start = 0L; |
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fls.l_len = 0L; |
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if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
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error(SYSTEM, "cannot lock ambient file"); |
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/* see if file has grown */ |
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lastpos = lseek(fileno(ambfp), 0L, 1); /* get previous position */ |
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if (fstat(fileno(ambfp), &sts) < 0) /* get current length */ |
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error(SYSTEM, "cannot stat ambient file"); |
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flen = sts.st_size; |
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if (n = (flen - lastpos)/AMBVALSIZ) { /* file has grown */ |
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if (ambinp == NULL) /* use duplicate file */ |
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ambinp = fdopen(dup(fileno(ambfp)), "r"); |
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while (n--) { /* load contributed values */ |
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readambval(&avs, ambinp); |
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avinsert(&avs,&atrunk,thescene.cuorg,thescene.cusize); |
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} /* moves shared file pointer */ |
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if (n = (flen - lastpos)%AMBVALSIZ) /* alignment */ |
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lseek(fileno(ambfp), flen-n, 0); |
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} |
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n = fflush(ambfp); /* calls write() at last */ |
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fls.l_type = F_UNLCK; /* release file */ |
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fcntl(fileno(ambfp), F_SETLKW, &fls); |
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return(n); |
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} |
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|
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#endif |