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/* Copyright (c) 1992 Regents of the University of California */ |
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/* Copyright (c) 1993 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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* 5/9/86 |
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*/ |
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#include "ray.h" |
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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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static int nunflshed = 0; /* number of unflushed ambient values */ |
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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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#define freeambtree(t) free((char *)(t)) |
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|
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extern long ftell(), lseek(); |
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static int initambfile(), avsave(), avinsert(), ambsync(); |
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static int initambfile(), avsave(), avinsert(), loadatree(); |
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static AMBVAL *avstore(); |
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#ifdef F_SETLKW |
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static aflock(); |
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#endif |
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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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ambres = ar < 0 ? 0 : ar; /* may be done already */ |
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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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} |
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|
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|
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setambacc(newa) /* set ambient accuracy */ |
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double newa; |
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{ |
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static double oldambacc = -1.0; |
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AMBTREE oldatrunk; |
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|
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ambacc = newa < 0.0 ? 0.0 : newa; /* may be done already */ |
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if (oldambacc < -FTINY) |
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oldambacc = ambacc; /* do nothing first call */ |
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if (fabs(newa - oldambacc) < 0.01) |
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return; /* insignificant -- don't bother */ |
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if (ambacc <= FTINY) |
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return; /* cannot build new tree */ |
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/* else need to rebuild tree */ |
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copystruct(&oldatrunk, &atrunk); |
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atrunk.alist = NULL; |
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atrunk.kid = NULL; |
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loadatree(&oldatrunk); |
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oldambacc = ambacc; /* remeber setting for next call */ |
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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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AMBVAL amb; |
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/* init ambient limits */ |
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setambres(ambres); |
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setambacc(ambacc); |
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if (afile == NULL) |
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return; |
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if (ambacc <= FTINY) { |
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sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened", |
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afile); |
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error(WARNING, errmsg); |
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return; |
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} |
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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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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)-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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} |
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if ((ambfp = fopen(afile, "r+")) != NULL) { |
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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(avstore(&amb)); |
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/* align */ |
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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\"", afile); |
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error(SYSTEM, errmsg); |
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} |
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nunflshed++; /* lie */ |
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ambsync(); |
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} |
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FVECT c0; |
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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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COLOR ct; |
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FVECT ck0; |
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{ |
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extern char *progname, *octname, VersionID[]; |
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|
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#ifdef F_SETLKW |
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aflock(creat ? F_WRLCK : F_RDLCK); |
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#endif |
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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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setbuf(ambfp, bmalloc(BUFSIZ+8)); |
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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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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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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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avinsert(avstore(av)); |
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if (ambfp == NULL) |
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return; |
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if (writambval(av, ambfp) < 0) |
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goto writerr; |
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if (++nunflshed >= AMBFLUSH) { |
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if (++nunflshed >= AMBFLUSH) |
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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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return; |
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writerr: |
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error(SYSTEM, "error writing ambient file"); |
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} |
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static AMBVAL * |
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avstore(aval) /* allocate memory and store aval */ |
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register AMBVAL *aval; |
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{ |
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register AMBVAL *av; |
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|
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if ((av = newambval()) == NULL) |
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error(SYSTEM, "out of memory in avstore"); |
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copystruct(av, aval); |
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return(av); |
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} |
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|
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|
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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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register AMBTREE *at; |
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FVECT c0; |
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double s; |
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avinsert(av) /* insert ambient value in our tree */ |
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register AMBVAL *av; |
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{ |
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register AMBTREE *at; |
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FVECT ck0; |
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double s; |
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int branch; |
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register AMBVAL *av; |
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register int i; |
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|
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if ((av = newambval()) == NULL) |
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goto memerr; |
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copystruct(av, aval); |
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VCOPY(ck0, c0); |
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if (av->rad <= FTINY) |
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error(CONSISTENCY, "zero ambient radius in avinsert"); |
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at = &atrunk; |
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VCOPY(ck0, thescene.cuorg); |
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s = thescene.cusize; |
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while (s*(OCTSCALE/2) > av->rad*ambacc) { |
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if (at->kid == NULL) |
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if ((at->kid = newambtree()) == NULL) |
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goto memerr; |
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error(SYSTEM, "out of memory in avinsert"); |
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s *= 0.5; |
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branch = 0; |
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for (i = 0; i < 3; i++) |
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} |
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av->next = at->alist; |
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at->alist = av; |
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return; |
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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 */ |
433 |
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loadatree(at) /* move tree to main store */ |
434 |
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register AMBTREE *at; |
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{ |
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return(fflush(ambfp)); |
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> |
register AMBVAL *av; |
437 |
> |
register int i; |
438 |
> |
/* transfer values at this node */ |
439 |
> |
for (av = at->alist; av != NULL; av = at->alist) { |
440 |
> |
at->alist = av->next; |
441 |
> |
avinsert(av); |
442 |
> |
} |
443 |
> |
if (at->kid == NULL) |
444 |
> |
return; |
445 |
> |
for (i = 0; i < 8; i++) /* transfer and free children */ |
446 |
> |
loadatree(at->kid+i); |
447 |
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freeambtree(at->kid); |
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} |
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#else |
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< |
#include <fcntl.h> |
405 |
< |
#include <sys/types.h> |
406 |
< |
#include <sys/stat.h> |
451 |
> |
#ifdef F_SETLKW |
452 |
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|
453 |
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static |
454 |
+ |
aflock(typ) /* lock/unlock ambient file */ |
455 |
+ |
int typ; |
456 |
+ |
{ |
457 |
+ |
static struct flock fls; /* static so initialized to zeroes */ |
458 |
+ |
|
459 |
+ |
fls.l_type = typ; |
460 |
+ |
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
461 |
+ |
error(SYSTEM, "cannot (un)lock ambient file"); |
462 |
+ |
} |
463 |
+ |
|
464 |
+ |
|
465 |
+ |
int |
466 |
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ambsync() /* synchronize ambient file */ |
467 |
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{ |
468 |
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static FILE *ambinp = NULL; |
469 |
< |
struct flock fls; |
470 |
< |
struct stat sts; |
469 |
> |
static long lastpos = -1; |
470 |
> |
long flen; |
471 |
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AMBVAL avs; |
415 |
– |
long lastpos, flen; |
472 |
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register int n; |
473 |
+ |
|
474 |
+ |
if (nunflshed == 0) |
475 |
+ |
return(0); |
476 |
+ |
if (lastpos < 0) /* initializing (locked in initambfile) */ |
477 |
+ |
goto syncend; |
478 |
|
/* gain exclusive access */ |
479 |
< |
fls.l_type = F_WRLCK; |
419 |
< |
fls.l_whence = 0; |
420 |
< |
fls.l_start = 0L; |
421 |
< |
fls.l_len = 0L; |
422 |
< |
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
423 |
< |
error(SYSTEM, "cannot lock ambient file"); |
479 |
> |
aflock(F_WRLCK); |
480 |
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/* see if file has grown */ |
481 |
< |
lastpos = lseek(fileno(ambfp), 0L, 1); /* get previous position */ |
482 |
< |
if (fstat(fileno(ambfp), &sts) < 0) /* get current length */ |
483 |
< |
error(SYSTEM, "cannot stat ambient file"); |
484 |
< |
flen = sts.st_size; |
429 |
< |
if (n = (flen - lastpos)/AMBVALSIZ) { /* file has grown */ |
430 |
< |
if (ambinp == NULL) /* use duplicate file */ |
481 |
> |
if ((flen = lseek(fileno(ambfp), 0L, 2)) < 0) |
482 |
> |
goto seekerr; |
483 |
> |
if (n = flen - lastpos) { /* file has grown */ |
484 |
> |
if (ambinp == NULL) { /* use duplicate filedes */ |
485 |
|
ambinp = fdopen(dup(fileno(ambfp)), "r"); |
486 |
< |
while (n--) { /* load contributed values */ |
486 |
> |
if (ambinp == NULL) |
487 |
> |
error(SYSTEM, "fdopen failed in ambsync"); |
488 |
> |
} |
489 |
> |
if (fseek(ambinp, lastpos, 0) < 0) |
490 |
> |
goto seekerr; |
491 |
> |
while (n >= AMBVALSIZ) { /* load contributed values */ |
492 |
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readambval(&avs, ambinp); |
493 |
< |
avinsert(&avs,&atrunk,thescene.cuorg,thescene.cusize); |
494 |
< |
} /* moves shared file pointer */ |
495 |
< |
if (n = (flen - lastpos)%AMBVALSIZ) /* alignment */ |
496 |
< |
lseek(fileno(ambfp), flen-n, 0); |
493 |
> |
avinsert(avstore(&avs)); |
494 |
> |
n -= AMBVALSIZ; |
495 |
> |
} |
496 |
> |
/*** seek always as safety measure |
497 |
> |
if (n) ***/ /* alignment */ |
498 |
> |
if (lseek(fileno(ambfp), flen-n, 0) < 0) |
499 |
> |
goto seekerr; |
500 |
|
} |
501 |
+ |
#ifdef DEBUG |
502 |
+ |
if (ambfp->_ptr - ambfp->_base != nunflshed*AMBVALSIZ) { |
503 |
+ |
sprintf(errmsg, "ambient file buffer at %d rather than %d", |
504 |
+ |
ambfp->_ptr - ambfp->_base, |
505 |
+ |
nunflshed*AMBVALSIZ); |
506 |
+ |
error(CONSISTENCY, errmsg); |
507 |
+ |
} |
508 |
+ |
#endif |
509 |
+ |
syncend: |
510 |
|
n = fflush(ambfp); /* calls write() at last */ |
511 |
< |
fls.l_type = F_UNLCK; /* release file */ |
512 |
< |
fcntl(fileno(ambfp), F_SETLKW, &fls); |
511 |
> |
if ((lastpos = lseek(fileno(ambfp), 0L, 1)) < 0) |
512 |
> |
goto seekerr; |
513 |
> |
aflock(F_UNLCK); /* release file */ |
514 |
> |
nunflshed = 0; |
515 |
|
return(n); |
516 |
+ |
seekerr: |
517 |
+ |
error(SYSTEM, "seek failed in ambsync"); |
518 |
+ |
} |
519 |
+ |
|
520 |
+ |
#else |
521 |
+ |
|
522 |
+ |
int |
523 |
+ |
ambsync() /* flush ambient file */ |
524 |
+ |
{ |
525 |
+ |
if (nunflshed == 0) |
526 |
+ |
return(0); |
527 |
+ |
nunflshed = 0; |
528 |
+ |
return(fflush(ambfp)); |
529 |
|
} |
530 |
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|
531 |
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#endif |