--- ray/src/rt/ambient.c 1991/06/07 10:04:29 1.14 +++ ray/src/rt/ambient.c 1994/06/02 11:45:27 2.25 @@ -1,4 +1,4 @@ -/* Copyright (c) 1991 Regents of the University of California */ +/* Copyright (c) 1993 Regents of the University of California */ #ifndef lint static char SCCSid[] = "$SunId$ LBL"; @@ -6,11 +6,6 @@ static char SCCSid[] = "$SunId$ LBL"; /* * ambient.c - routines dealing with ambient (inter-reflected) component. - * - * The macro AMBFLUSH (if defined) is the number of ambient values - * to wait before flushing to the ambient file. - * - * 5/9/86 */ #include "ray.h" @@ -23,61 +18,124 @@ static char SCCSid[] = "$SunId$ LBL"; #include "random.h" -#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ +#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ typedef struct ambtree { - AMBVAL *alist; /* ambient value list */ - struct ambtree *kid; /* 8 child nodes */ + AMBVAL *alist; /* ambient value list */ + struct ambtree *kid; /* 8 child nodes */ } AMBTREE; /* ambient octree */ extern CUBE thescene; /* contains space boundaries */ -#define MAXASET 511 /* maximum number of elements in ambient set */ -OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ +#define MAXASET 511 /* maximum number of elements in ambient set */ +OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ -double maxarad; /* maximum ambient radius */ -double minarad; /* minimum ambient radius */ +double maxarad; /* maximum ambient radius */ +double minarad; /* minimum ambient radius */ -static AMBTREE atrunk; /* our ambient trunk node */ +static AMBTREE atrunk; /* our ambient trunk node */ static FILE *ambfp = NULL; /* ambient file pointer */ +static int nunflshed = 0; /* number of unflushed ambient values */ -#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) +#define AMBFLUSH (BUFSIZ/AMBVALSIZ) -#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) +#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) +#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) +#define freeambtree(t) free((char *)(t)) -setambient(afile) /* initialize calculation */ -char *afile; +extern long ftell(), lseek(); +static int initambfile(), avsave(), avinsert(), loadatree(); +static AMBVAL *avstore(); +#ifdef F_SETLKW +static aflock(); +#endif + + +setambres(ar) /* set ambient resolution */ +int ar; { - long ftell(); - AMBVAL amb; + ambres = ar < 0 ? 0 : ar; /* may be done already */ + /* set min & max radii */ + if (ar <= 0) { + minarad = 0; + maxarad = thescene.cusize / 2.0; + } else { + minarad = thescene.cusize / ar; + maxarad = 16 * minarad; /* heuristic */ + if (maxarad > thescene.cusize / 2.0) + maxarad = thescene.cusize / 2.0; + } + if (minarad <= FTINY) + minarad = 10*FTINY; + if (maxarad <= minarad) + maxarad = 64 * minarad; +} - maxarad = thescene.cusize / 2.0; /* maximum radius */ - /* minimum radius */ - minarad = ambres > 0 ? thescene.cusize/ambres : 0.0; - /* open ambient file */ - if (afile != NULL) - if ((ambfp = fopen(afile, "r+")) != NULL) { - while (fread((char *)&amb,sizeof(AMBVAL),1,ambfp) == 1) - avinsert(&amb, &atrunk, thescene.cuorg, - thescene.cusize); - /* align */ - fseek(ambfp, -(ftell(ambfp)%sizeof(AMBVAL)), 1); - } else if ((ambfp = fopen(afile, "w")) == NULL) { - sprintf(errmsg, "cannot open ambient file \"%s\"", - afile); - error(SYSTEM, errmsg); - } +setambacc(newa) /* set ambient accuracy */ +double newa; +{ + static double oldambacc = -1.0; + AMBTREE oldatrunk; + + ambacc = newa < 0.0 ? 0.0 : newa; /* may be done already */ + if (oldambacc < -FTINY) + oldambacc = ambacc; /* do nothing first call */ + if (fabs(newa - oldambacc) < 0.01) + return; /* insignificant -- don't bother */ + if (ambacc <= FTINY) + return; /* cannot build new tree */ + /* else need to rebuild tree */ + copystruct(&oldatrunk, &atrunk); + atrunk.alist = NULL; + atrunk.kid = NULL; + loadatree(&oldatrunk); + oldambacc = ambacc; /* remeber setting for next call */ } +setambient(afile) /* initialize calculation */ +char *afile; +{ + long headlen; + AMBVAL amb; + /* init ambient limits */ + setambres(ambres); + setambacc(ambacc); + if (afile == NULL) + return; + if (ambacc <= FTINY) { + sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened", + afile); + error(WARNING, errmsg); + return; + } + /* open ambient file */ + if ((ambfp = fopen(afile, "r+")) != NULL) { + initambfile(0); + headlen = ftell(ambfp); + while (readambval(&amb, ambfp)) + avinsert(avstore(&amb)); + /* align */ + fseek(ambfp, -((ftell(ambfp)-headlen)%AMBVALSIZ), 1); + } else if ((ambfp = fopen(afile, "w+")) != NULL) + initambfile(1); + else { + sprintf(errmsg, "cannot open ambient file \"%s\"", afile); + error(SYSTEM, errmsg); + } + nunflshed++; /* lie */ + ambsync(); +} + + ambnotify(obj) /* record new modifier */ -OBJECT obj; +OBJECT obj; { static int hitlimit = 0; - register OBJREC *o = objptr(obj); + register OBJREC *o = objptr(obj); register char **amblp; if (hitlimit || !ismodifier(o->otype)) @@ -100,14 +158,12 @@ COLOR acol; register RAY *r; { static int rdepth = 0; /* ambient recursion */ - double wsum; + double d; - rdepth++; /* increment level */ - if (ambdiv <= 0) /* no ambient calculation */ goto dumbamb; /* check number of bounces */ - if (rdepth > ambounce) + if (rdepth >= ambounce) goto dumbamb; /* check ambient list */ if (ambincl != -1 && r->ro != NULL && @@ -115,48 +171,54 @@ register RAY *r; goto dumbamb; if (ambacc <= FTINY) { /* no ambient storage */ - if (doambient(acol, r, NULL, NULL) == 0.0) + rdepth++; + d = doambient(acol, r, r->rweight, NULL, NULL); + rdepth--; + if (d == 0.0) goto dumbamb; - goto done; + return; } /* get ambient value */ setcolor(acol, 0.0, 0.0, 0.0); - wsum = sumambient(acol, r, &atrunk, thescene.cuorg, thescene.cusize); - if (wsum > FTINY) - scalecolor(acol, 1.0/wsum); - else if (makeambient(acol, r) == 0.0) - goto dumbamb; - goto done; - + d = sumambient(acol, r, rdepth, + &atrunk, thescene.cuorg, thescene.cusize); + if (d > FTINY) + scalecolor(acol, 1.0/d); + else { + d = makeambient(acol, r, rdepth++); + rdepth--; + } + if (d > FTINY) + return; dumbamb: /* return global value */ copycolor(acol, ambval); -done: /* must finish here! */ - rdepth--; } double -sumambient(acol, r, at, c0, s) /* get interpolated ambient value */ +sumambient(acol, r, al, at, c0, s) /* get interpolated ambient value */ COLOR acol; register RAY *r; -AMBTREE *at; +int al; +AMBTREE *at; FVECT c0; -double s; +double s; { - extern double sqrt(); - double d, e1, e2, wt, wsum; + double d, e1, e2, wt, wsum; COLOR ct; FVECT ck0; int i; register int j; - register AMBVAL *av; + register AMBVAL *av; /* do this node */ wsum = 0.0; for (av = at->alist; av != NULL; av = av->next) { /* - * Ray strength test. + * Ambient level test. */ - if (av->lvl > r->rlvl || av->weight < r->rweight-FTINY) + if (av->lvl > al) /* list sorted, so this works */ + break; + if (av->weight < r->rweight-FTINY) continue; /* * Ambient radius test. @@ -183,13 +245,13 @@ double s; for (j = 0; j < 3; j++) d += (r->rop[j] - av->pos[j]) * (av->dir[j] + r->ron[j]); - if (d*0.5 < -minarad*ambacc) + if (d*0.5 < -minarad*ambacc-.001) continue; /* * Jittering final test reduces image artifacts. */ wt = sqrt(e1) + sqrt(e2); - wt *= .9 + .2*frandom(); + wt *= .9 + .2*urand(9015+samplendx); if (wt > ambacc) continue; if (wt <= 1e-3) @@ -197,7 +259,7 @@ double s; else wt = 1.0 / wt; wsum += wt; - copycolor(ct, av->val); + extambient(ct, av, r->rop, r->ron); scalecolor(ct, wt); addcolor(acol, ct); } @@ -216,82 +278,150 @@ double s; break; } if (j == 3) - wsum += sumambient(acol, r, at->kid+i, ck0, s); + wsum += sumambient(acol, r, al, at->kid+i, ck0, s); } return(wsum); } double -makeambient(acol, r) /* make a new ambient value */ +makeambient(acol, r, al) /* make a new ambient value */ COLOR acol; register RAY *r; +int al; { - AMBVAL amb; + AMBVAL amb; FVECT gp, gd; - - amb.rad = doambient(acol, r, gp, gd); /* compute ambient */ + /* compute weight */ + amb.weight = pow(AVGREFL, (double)al); + if (r->rweight < 0.2*amb.weight) /* heuristic */ + amb.weight = r->rweight; + /* compute ambient */ + amb.rad = doambient(acol, r, amb.weight, gp, gd); if (amb.rad == 0.0) return(0.0); /* store it */ VCOPY(amb.pos, r->rop); VCOPY(amb.dir, r->ron); - amb.lvl = r->rlvl; - amb.weight = r->rweight; + amb.lvl = al; copycolor(amb.val, acol); VCOPY(amb.gpos, gp); VCOPY(amb.gdir, gd); /* insert into tree */ - avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize); - avsave(&amb); /* write to file */ + avsave(&amb); /* and save to file */ return(amb.rad); } +extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ +COLOR cr; +register AMBVAL *ap; +FVECT pv, nv; +{ + FVECT v1, v2; + register int i; + double d; + + d = 1.0; /* zeroeth order */ + /* gradient due to translation */ + for (i = 0; i < 3; i++) + d += ap->gpos[i]*(pv[i]-ap->pos[i]); + /* gradient due to rotation */ + VCOPY(v1, ap->dir); + fcross(v2, v1, nv); + d += DOT(ap->gdir, v2); + if (d <= 0.0) { + setcolor(cr, 0.0, 0.0, 0.0); + return; + } + copycolor(cr, ap->val); + scalecolor(cr, d); +} + + static -avsave(av) /* save an ambient value */ -AMBVAL *av; +initambfile(creat) /* initialize ambient file */ +int creat; { -#ifdef AMBFLUSH - static int nunflshed = 0; + extern char *progname, *octname, VersionID[]; + +#ifdef F_SETLKW + aflock(creat ? F_WRLCK : F_RDLCK); #endif +#ifdef MSDOS + setmode(fileno(ambfp), O_BINARY); +#endif + setbuf(ambfp, bmalloc(BUFSIZ+8)); + if (creat) { /* new file */ + newheader("RADIANCE", ambfp); + fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ", + progname, colval(ambval,RED), + colval(ambval,GRN), colval(ambval,BLU), + ambounce, ambacc); + fprintf(ambfp, "-ad %d -as %d -ar %d %s\n", + ambdiv, ambssamp, ambres, + octname==NULL ? "" : octname); + fprintf(ambfp, "SOFTWARE= %s\n", VersionID); + fputformat(AMBFMT, ambfp); + putc('\n', ambfp); + putambmagic(ambfp); + } else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) + error(USER, "bad ambient file"); +} + + +static +avsave(av) /* insert and save an ambient value */ +AMBVAL *av; +{ + avinsert(avstore(av)); if (ambfp == NULL) return; - if (fwrite((char *)av, sizeof(AMBVAL), 1, ambfp) != 1) + if (writambval(av, ambfp) < 0) goto writerr; -#ifdef AMBFLUSH - if (++nunflshed >= AMBFLUSH) { - if (fflush(ambfp) == EOF) + if (++nunflshed >= AMBFLUSH) + if (ambsync() == EOF) goto writerr; - nunflshed = 0; - } -#endif return; writerr: error(SYSTEM, "error writing ambient file"); } +static AMBVAL * +avstore(aval) /* allocate memory and store aval */ +register AMBVAL *aval; +{ + register AMBVAL *av; + + if ((av = newambval()) == NULL) + error(SYSTEM, "out of memory in avstore"); + copystruct(av, aval); + return(av); +} + + static -avinsert(aval, at, c0, s) /* insert ambient value in a tree */ -AMBVAL *aval; -register AMBTREE *at; -FVECT c0; -double s; +avinsert(av) /* insert ambient value in our tree */ +register AMBVAL *av; { + register AMBTREE *at; + register AMBVAL *ap; + AMBVAL avh; FVECT ck0; + double s; int branch; - register AMBVAL *av; register int i; - if ((av = newambval()) == NULL) - goto memerr; - copystruct(av, aval); - VCOPY(ck0, c0); + if (av->rad <= FTINY) + error(CONSISTENCY, "zero ambient radius in avinsert"); + at = &atrunk; + VCOPY(ck0, thescene.cuorg); + s = thescene.cusize; while (s*(OCTSCALE/2) > av->rad*ambacc) { if (at->kid == NULL) if ((at->kid = newambtree()) == NULL) - goto memerr; + error(SYSTEM, "out of memory in avinsert"); s *= 0.5; branch = 0; for (i = 0; i < 3; i++) @@ -301,9 +431,113 @@ double s; } at = at->kid + branch; } - av->next = at->alist; - at->alist = av; - return; -memerr: - error(SYSTEM, "out of memory in avinsert"); + avh.next = at->alist; /* order by increasing level */ + for (ap = &avh; ap->next != NULL; ap = ap->next) + if (ap->next->lvl >= av->lvl) + break; + av->next = ap->next; + ap->next = av; + at->alist = avh.next; } + + +static +loadatree(at) /* move tree to main store */ +register AMBTREE *at; +{ + register AMBVAL *av; + register int i; + /* transfer values at this node */ + for (av = at->alist; av != NULL; av = at->alist) { + at->alist = av->next; + avinsert(av); + } + if (at->kid == NULL) + return; + for (i = 0; i < 8; i++) /* transfer and free children */ + loadatree(at->kid+i); + freeambtree(at->kid); +} + + +#ifdef F_SETLKW + +static +aflock(typ) /* lock/unlock ambient file */ +int typ; +{ + static struct flock fls; /* static so initialized to zeroes */ + + fls.l_type = typ; + if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) + error(SYSTEM, "cannot (un)lock ambient file"); +} + + +int +ambsync() /* synchronize ambient file */ +{ + static FILE *ambinp = NULL; + static long lastpos = -1; + long flen; + AMBVAL avs; + register int n; + + if (nunflshed == 0) + return(0); + if (lastpos < 0) /* initializing (locked in initambfile) */ + goto syncend; + /* gain exclusive access */ + aflock(F_WRLCK); + /* see if file has grown */ + if ((flen = lseek(fileno(ambfp), 0L, 2)) < 0) + goto seekerr; + if (n = flen - lastpos) { /* file has grown */ + if (ambinp == NULL) { /* use duplicate filedes */ + ambinp = fdopen(dup(fileno(ambfp)), "r"); + if (ambinp == NULL) + error(SYSTEM, "fdopen failed in ambsync"); + } + if (fseek(ambinp, lastpos, 0) < 0) + goto seekerr; + while (n >= AMBVALSIZ) { /* load contributed values */ + readambval(&avs, ambinp); + avinsert(avstore(&avs)); + n -= AMBVALSIZ; + } + /*** seek always as safety measure + if (n) ***/ /* alignment */ + if (lseek(fileno(ambfp), flen-n, 0) < 0) + goto seekerr; + } +#ifdef DEBUG + if (ambfp->_ptr - ambfp->_base != nunflshed*AMBVALSIZ) { + sprintf(errmsg, "ambient file buffer at %d rather than %d", + ambfp->_ptr - ambfp->_base, + nunflshed*AMBVALSIZ); + error(CONSISTENCY, errmsg); + } +#endif +syncend: + n = fflush(ambfp); /* calls write() at last */ + if ((lastpos = lseek(fileno(ambfp), 0L, 1)) < 0) + goto seekerr; + aflock(F_UNLCK); /* release file */ + nunflshed = 0; + return(n); +seekerr: + error(SYSTEM, "seek failed in ambsync"); +} + +#else + +int +ambsync() /* flush ambient file */ +{ + if (nunflshed == 0) + return(0); + nunflshed = 0; + return(fflush(ambfp)); +} + +#endif