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/* Copyright (c) 1986 Regents of the University of California */ |
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/* Copyright (c) 1995 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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/* |
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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 "ray.h" |
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|
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#include "octree.h" |
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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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> |
#define OCTSCALE 1.0 /* 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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> |
extern char *shm_boundary; /* memory sharing boundary */ |
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|
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OBJECT ambset[128]; /* 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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|
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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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static AMBTREE atrunk; /* our ambient trunk node */ |
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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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> |
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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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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> |
#ifndef SORT_THRESH |
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> |
#ifdef BIGMEM |
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> |
#define SORT_THRESH ((9L<<20)/sizeof(AMBVAL)) |
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> |
#else |
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> |
#define SORT_THRESH ((3L<<20)/sizeof(AMBVAL)) |
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> |
#endif |
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> |
#endif |
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> |
#ifndef SORT_INTVL |
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> |
#define SORT_INTVL (SORT_THRESH*256) |
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#endif |
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#ifndef MAX_SORT_INTVL |
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#define MAX_SORT_INTVL (SORT_INTVL<<4) |
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#endif |
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|
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< |
static AMBTREE atrunk; /* our ambient trunk node */ |
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> |
static unsigned long ambclock = 0; /* ambient access clock */ |
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> |
static unsigned int nambvals = 0; /* number of stored ambient values */ |
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static unsigned long lastsort = 0; /* time of last value sort */ |
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> |
static long sortintvl = SORT_INTVL; /* time until next sort */ |
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|
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static FILE *ambfp = NULL; /* ambient file pointer */ |
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#define MAXACLOCK (1L<<30) /* clock turnover value */ |
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/* |
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* Track access times unless we are sharing ambient values |
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* through memory on a multiprocessor, when we want to avoid |
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* claiming our own memory (copy on write). |
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*/ |
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#define tracktime (shm_boundary == NULL || ambfp == NULL) |
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|
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< |
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
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> |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
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|
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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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|
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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(), sortambvals(); |
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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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|
| 82 |
+ |
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 */ |
| 87 |
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if (ar <= 0) { |
| 88 |
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minarad = 0; |
| 89 |
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maxarad = thescene.cusize / 2.0; |
| 90 |
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} else { |
| 91 |
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minarad = thescene.cusize / ar; |
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maxarad = 64 * minarad; /* heuristic */ |
| 93 |
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if (maxarad > thescene.cusize / 2.0) |
| 94 |
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maxarad = thescene.cusize / 2.0; |
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} |
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if (minarad <= FTINY) |
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minarad = 10*FTINY; |
| 98 |
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if (maxarad <= minarad) |
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maxarad = 64 * minarad; |
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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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|
| 108 |
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ambacc = newa < 0.0 ? 0.0 : newa; /* may be done already */ |
| 109 |
+ |
if (oldambacc < -FTINY) |
| 110 |
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oldambacc = ambacc; /* do nothing first call */ |
| 111 |
+ |
if (fabs(newa - oldambacc) < 0.01) |
| 112 |
+ |
return; /* insignificant -- don't bother */ |
| 113 |
+ |
if (ambacc <= FTINY) |
| 114 |
+ |
return; /* cannot build new tree */ |
| 115 |
+ |
/* else need to rebuild tree */ |
| 116 |
+ |
sortambvals(1); |
| 117 |
+ |
oldambacc = ambacc; /* remeber setting for next call */ |
| 118 |
+ |
} |
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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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{ |
| 124 |
< |
long ftell(); |
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< |
char **amblp; |
| 126 |
< |
OBJECT obj; |
| 127 |
< |
AMBVAL amb; |
| 128 |
< |
/* set up ambient set */ |
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< |
ambset[0] = 0; |
| 130 |
< |
for (amblp = amblist; *amblp != NULL; amblp++) { |
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< |
if ((obj = modifier(*amblp)) == OVOID) { |
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< |
sprintf(errmsg, "unknown %s modifier \"%s\"", |
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< |
ambincl ? "include" : "exclude", *amblp); |
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< |
error(WARNING, errmsg); |
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< |
continue; |
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< |
} |
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< |
if (!inset(ambset, obj)) |
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< |
insertelem(ambset, obj); |
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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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> |
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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< |
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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> |
/* open ambient file */ |
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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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|
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< |
/* open ambient file */ |
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< |
if (afile != NULL) |
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< |
if ((ambfp = fopen(afile, "r+")) != NULL) { |
| 158 |
< |
while (fread(&amb, sizeof(AMBVAL), 1, ambfp) == 1) |
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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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< |
sprintf(errmsg, "cannot open ambient file \"%s\"", |
| 165 |
< |
afile); |
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< |
error(SYSTEM, errmsg); |
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> |
|
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> |
ambnotify(obj) /* record new modifier */ |
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> |
OBJECT obj; |
| 158 |
> |
{ |
| 159 |
> |
static int hitlimit = 0; |
| 160 |
> |
register OBJREC *o = objptr(obj); |
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> |
register char **amblp; |
| 162 |
> |
|
| 163 |
> |
if (hitlimit || !ismodifier(o->otype)) |
| 164 |
> |
return; |
| 165 |
> |
for (amblp = amblist; *amblp != NULL; amblp++) |
| 166 |
> |
if (!strcmp(o->oname, *amblp)) { |
| 167 |
> |
if (ambset[0] >= MAXASET) { |
| 168 |
> |
error(WARNING, "too many modifiers in ambient list"); |
| 169 |
> |
hitlimit++; |
| 170 |
> |
return; /* should this be fatal? */ |
| 171 |
> |
} |
| 172 |
> |
insertelem(ambset, obj); |
| 173 |
> |
return; |
| 174 |
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} |
| 175 |
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} |
| 176 |
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|
| 180 |
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register RAY *r; |
| 181 |
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{ |
| 182 |
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static int rdepth = 0; /* ambient recursion */ |
| 183 |
< |
double wsum; |
| 183 |
> |
double d; |
| 184 |
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|
| 119 |
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rdepth++; /* increment level */ |
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– |
|
| 185 |
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if (ambdiv <= 0) /* no ambient calculation */ |
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goto dumbamb; |
| 187 |
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/* check number of bounces */ |
| 188 |
< |
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 */ |
| 196 |
< |
if (doambient(acol, r) == 0.0) |
| 196 |
> |
rdepth++; |
| 197 |
> |
d = doambient(acol, r, r->rweight, NULL, NULL); |
| 198 |
> |
rdepth--; |
| 199 |
> |
if (d == 0.0) |
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goto dumbamb; |
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< |
goto done; |
| 201 |
> |
return; |
| 202 |
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} |
| 203 |
+ |
/* resort memory? */ |
| 204 |
+ |
sortambvals(0); |
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/* get ambient value */ |
| 206 |
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setcolor(acol, 0.0, 0.0, 0.0); |
| 207 |
< |
wsum = sumambient(acol, r, &atrunk, thescene.cuorg, thescene.cusize); |
| 208 |
< |
if (wsum > FTINY) |
| 209 |
< |
scalecolor(acol, 1.0/wsum); |
| 210 |
< |
else if (makeambient(acol, r) == 0.0) |
| 211 |
< |
goto dumbamb; |
| 212 |
< |
goto done; |
| 213 |
< |
|
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> |
d = sumambient(acol, r, rdepth, |
| 208 |
> |
&atrunk, thescene.cuorg, thescene.cusize); |
| 209 |
> |
if (d > FTINY) |
| 210 |
> |
scalecolor(acol, 1.0/d); |
| 211 |
> |
else { |
| 212 |
> |
d = makeambient(acol, r, rdepth++); |
| 213 |
> |
rdepth--; |
| 214 |
> |
} |
| 215 |
> |
if (d > FTINY) |
| 216 |
> |
return; |
| 217 |
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dumbamb: /* return global value */ |
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copycolor(acol, ambval); |
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– |
done: /* must finish here! */ |
| 148 |
– |
rdepth--; |
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} |
| 220 |
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|
| 221 |
|
|
| 222 |
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double |
| 223 |
< |
sumambient(acol, r, at, c0, s) /* get interpolated ambient value */ |
| 223 |
> |
sumambient(acol, r, al, at, c0, s) /* get interpolated ambient value */ |
| 224 |
|
COLOR acol; |
| 225 |
|
register RAY *r; |
| 226 |
< |
AMBTREE *at; |
| 226 |
> |
int al; |
| 227 |
> |
AMBTREE *at; |
| 228 |
|
FVECT c0; |
| 229 |
< |
double s; |
| 229 |
> |
double s; |
| 230 |
|
{ |
| 231 |
< |
extern double sqrt(); |
| 161 |
< |
double d, e1, e2, wt, wsum; |
| 231 |
> |
double d, e1, e2, wt, wsum; |
| 232 |
|
COLOR ct; |
| 233 |
|
FVECT ck0; |
| 234 |
|
int i; |
| 235 |
|
register int j; |
| 236 |
< |
register AMBVAL *av; |
| 237 |
< |
/* do this node */ |
| 236 |
> |
register AMBVAL *av; |
| 237 |
> |
|
| 238 |
|
wsum = 0.0; |
| 239 |
+ |
/* do this node */ |
| 240 |
|
for (av = at->alist; av != NULL; av = av->next) { |
| 241 |
+ |
if (tracktime) |
| 242 |
+ |
av->latick = ambclock++; |
| 243 |
|
/* |
| 244 |
< |
* Ray strength test. |
| 244 |
> |
* Ambient level test. |
| 245 |
|
*/ |
| 246 |
< |
if (av->lvl > r->rlvl || av->weight < r->rweight-FTINY) |
| 246 |
> |
if (av->lvl > al) /* list sorted, so this works */ |
| 247 |
> |
break; |
| 248 |
> |
if (av->weight < r->rweight-FTINY) |
| 249 |
|
continue; |
| 250 |
|
/* |
| 251 |
|
* Ambient radius test. |
| 252 |
|
*/ |
| 253 |
< |
e1 = 0.0; |
| 254 |
< |
for (j = 0; j < 3; j++) { |
| 255 |
< |
d = av->pos[j] - r->rop[j]; |
| 256 |
< |
e1 += d * d; |
| 257 |
< |
} |
| 253 |
> |
d = av->pos[0] - r->rop[0]; |
| 254 |
> |
e1 = d * d; |
| 255 |
> |
d = av->pos[1] - r->rop[1]; |
| 256 |
> |
e1 += d * d; |
| 257 |
> |
d = av->pos[2] - r->rop[2]; |
| 258 |
> |
e1 += d * d; |
| 259 |
|
e1 /= av->rad * av->rad; |
| 260 |
|
if (e1 > ambacc*ambacc*1.21) |
| 261 |
|
continue; |
| 273 |
|
for (j = 0; j < 3; j++) |
| 274 |
|
d += (r->rop[j] - av->pos[j]) * |
| 275 |
|
(av->dir[j] + r->ron[j]); |
| 276 |
< |
if (d < -minarad) |
| 276 |
> |
if (d*0.5 < -minarad*ambacc-.001) |
| 277 |
|
continue; |
| 278 |
|
/* |
| 279 |
|
* Jittering final test reduces image artifacts. |
| 280 |
|
*/ |
| 281 |
|
wt = sqrt(e1) + sqrt(e2); |
| 282 |
< |
if (wt > ambacc*(0.9 + 0.2*frandom())) |
| 282 |
> |
wt *= .9 + .2*urand(9015+samplendx); |
| 283 |
> |
if (wt > ambacc) |
| 284 |
|
continue; |
| 285 |
|
if (wt <= 1e-3) |
| 286 |
|
wt = 1e3; |
| 287 |
|
else |
| 288 |
|
wt = 1.0 / wt; |
| 289 |
|
wsum += wt; |
| 290 |
< |
copycolor(ct, av->val); |
| 290 |
> |
extambient(ct, av, r->rop, r->ron); |
| 291 |
|
scalecolor(ct, wt); |
| 292 |
|
addcolor(acol, ct); |
| 293 |
|
} |
| 306 |
|
break; |
| 307 |
|
} |
| 308 |
|
if (j == 3) |
| 309 |
< |
wsum += sumambient(acol, r, at->kid+i, ck0, s); |
| 309 |
> |
wsum += sumambient(acol, r, al, at->kid+i, ck0, s); |
| 310 |
|
} |
| 311 |
|
return(wsum); |
| 312 |
|
} |
| 313 |
|
|
| 314 |
|
|
| 315 |
|
double |
| 316 |
< |
makeambient(acol, r) /* make a new ambient value */ |
| 316 |
> |
makeambient(acol, r, al) /* make a new ambient value */ |
| 317 |
|
COLOR acol; |
| 318 |
|
register RAY *r; |
| 319 |
+ |
int al; |
| 320 |
|
{ |
| 321 |
< |
AMBVAL amb; |
| 322 |
< |
|
| 323 |
< |
amb.rad = doambient(acol, r); /* compute ambient */ |
| 321 |
> |
AMBVAL amb; |
| 322 |
> |
FVECT gp, gd; |
| 323 |
> |
/* compute weight */ |
| 324 |
> |
amb.weight = pow(AVGREFL, (double)al); |
| 325 |
> |
if (r->rweight < 0.2*amb.weight) /* heuristic */ |
| 326 |
> |
amb.weight = r->rweight; |
| 327 |
> |
/* compute ambient */ |
| 328 |
> |
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
| 329 |
|
if (amb.rad == 0.0) |
| 330 |
|
return(0.0); |
| 331 |
|
/* store it */ |
| 332 |
|
VCOPY(amb.pos, r->rop); |
| 333 |
|
VCOPY(amb.dir, r->ron); |
| 334 |
< |
amb.lvl = r->rlvl; |
| 252 |
< |
amb.weight = r->rweight; |
| 334 |
> |
amb.lvl = al; |
| 335 |
|
copycolor(amb.val, acol); |
| 336 |
+ |
VCOPY(amb.gpos, gp); |
| 337 |
+ |
VCOPY(amb.gdir, gd); |
| 338 |
|
/* insert into tree */ |
| 339 |
< |
avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize); |
| 256 |
< |
avsave(&amb); /* write to file */ |
| 339 |
> |
avsave(&amb); /* and save to file */ |
| 340 |
|
return(amb.rad); |
| 341 |
|
} |
| 342 |
|
|
| 343 |
|
|
| 344 |
< |
double |
| 345 |
< |
doambient(acol, r) /* compute ambient component */ |
| 346 |
< |
COLOR acol; |
| 347 |
< |
register RAY *r; |
| 344 |
> |
extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
| 345 |
> |
COLOR cr; |
| 346 |
> |
register AMBVAL *ap; |
| 347 |
> |
FVECT pv, nv; |
| 348 |
|
{ |
| 349 |
< |
extern int ambcmp(); |
| 350 |
< |
extern double sin(), cos(), sqrt(); |
| 351 |
< |
double phi, xd, yd, zd; |
| 269 |
< |
double b, b2; |
| 270 |
< |
register AMBSAMP *div; |
| 271 |
< |
AMBSAMP dnew; |
| 272 |
< |
RAY ar; |
| 273 |
< |
FVECT ux, uy; |
| 274 |
< |
double arad; |
| 275 |
< |
int ndivs, nt, np, ns, ne, i, j; |
| 276 |
< |
register int k; |
| 349 |
> |
FVECT v1, v2; |
| 350 |
> |
register int i; |
| 351 |
> |
double d; |
| 352 |
|
|
| 353 |
< |
setcolor(acol, 0.0, 0.0, 0.0); |
| 354 |
< |
/* set number of divisions */ |
| 355 |
< |
nt = sqrt(ambdiv * r->rweight * 0.5) + 0.5; |
| 356 |
< |
np = 2 * nt; |
| 357 |
< |
ndivs = nt * np; |
| 358 |
< |
/* check first */ |
| 359 |
< |
if (ndivs == 0 || rayorigin(&ar, r, AMBIENT, 0.5) < 0) |
| 360 |
< |
return(0.0); |
| 361 |
< |
/* set number of super-samples */ |
| 362 |
< |
ns = ambssamp * r->rweight + 0.5; |
| 363 |
< |
if (ns > 0) { |
| 289 |
< |
div = (AMBSAMP *)malloc(ndivs*sizeof(AMBSAMP)); |
| 290 |
< |
if (div == NULL) |
| 291 |
< |
error(SYSTEM, "out of memory in doambient"); |
| 353 |
> |
d = 1.0; /* zeroeth order */ |
| 354 |
> |
/* gradient due to translation */ |
| 355 |
> |
for (i = 0; i < 3; i++) |
| 356 |
> |
d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
| 357 |
> |
/* gradient due to rotation */ |
| 358 |
> |
VCOPY(v1, ap->dir); |
| 359 |
> |
fcross(v2, v1, nv); |
| 360 |
> |
d += DOT(ap->gdir, v2); |
| 361 |
> |
if (d <= 0.0) { |
| 362 |
> |
setcolor(cr, 0.0, 0.0, 0.0); |
| 363 |
> |
return; |
| 364 |
|
} |
| 365 |
< |
/* make axes */ |
| 366 |
< |
uy[0] = uy[1] = uy[2] = 0.0; |
| 295 |
< |
for (k = 0; k < 3; k++) |
| 296 |
< |
if (r->ron[k] < 0.6 && r->ron[k] > -0.6) |
| 297 |
< |
break; |
| 298 |
< |
uy[k] = 1.0; |
| 299 |
< |
fcross(ux, r->ron, uy); |
| 300 |
< |
normalize(ux); |
| 301 |
< |
fcross(uy, ux, r->ron); |
| 302 |
< |
/* sample divisions */ |
| 303 |
< |
arad = 0.0; |
| 304 |
< |
ne = 0; |
| 305 |
< |
for (i = 0; i < nt; i++) |
| 306 |
< |
for (j = 0; j < np; j++) { |
| 307 |
< |
rayorigin(&ar, r, AMBIENT, 0.5); /* pretested */ |
| 308 |
< |
zd = sqrt((i+frandom())/nt); |
| 309 |
< |
phi = 2.0*PI * (j+frandom())/np; |
| 310 |
< |
xd = cos(phi) * zd; |
| 311 |
< |
yd = sin(phi) * zd; |
| 312 |
< |
zd = sqrt(1.0 - zd*zd); |
| 313 |
< |
for (k = 0; k < 3; k++) |
| 314 |
< |
ar.rdir[k] = xd*ux[k]+yd*uy[k]+zd*r->ron[k]; |
| 315 |
< |
rayvalue(&ar); |
| 316 |
< |
if (ar.rot < FHUGE) |
| 317 |
< |
arad += 1.0 / ar.rot; |
| 318 |
< |
if (ns > 0) { /* save division */ |
| 319 |
< |
div[ne].k = 0.0; |
| 320 |
< |
copycolor(div[ne].v, ar.rcol); |
| 321 |
< |
div[ne].n = 0; |
| 322 |
< |
div[ne].t = i; div[ne].p = j; |
| 323 |
< |
/* sum errors */ |
| 324 |
< |
b = bright(ar.rcol); |
| 325 |
< |
if (i > 0) { /* from above */ |
| 326 |
< |
b2 = bright(div[ne-np].v) - b; |
| 327 |
< |
b2 *= b2 * 0.25; |
| 328 |
< |
div[ne].k += b2; |
| 329 |
< |
div[ne].n++; |
| 330 |
< |
div[ne-np].k += b2; |
| 331 |
< |
div[ne-np].n++; |
| 332 |
< |
} |
| 333 |
< |
if (j > 0) { /* from behind */ |
| 334 |
< |
b2 = bright(div[ne-1].v) - b; |
| 335 |
< |
b2 *= b2 * 0.25; |
| 336 |
< |
div[ne].k += b2; |
| 337 |
< |
div[ne].n++; |
| 338 |
< |
div[ne-1].k += b2; |
| 339 |
< |
div[ne-1].n++; |
| 340 |
< |
} |
| 341 |
< |
if (j == np-1) { /* around */ |
| 342 |
< |
b2 = bright(div[ne-(np-1)].v) - b; |
| 343 |
< |
b2 *= b2 * 0.25; |
| 344 |
< |
div[ne].k += b2; |
| 345 |
< |
div[ne].n++; |
| 346 |
< |
div[ne-(np-1)].k += b2; |
| 347 |
< |
div[ne-(np-1)].n++; |
| 348 |
< |
} |
| 349 |
< |
ne++; |
| 350 |
< |
} else |
| 351 |
< |
addcolor(acol, ar.rcol); |
| 352 |
< |
} |
| 353 |
< |
for (k = 0; k < ne; k++) { /* compute errors */ |
| 354 |
< |
if (div[k].n > 1) |
| 355 |
< |
div[k].k /= div[k].n; |
| 356 |
< |
div[k].n = 1; |
| 357 |
< |
} |
| 358 |
< |
/* sort the divisions */ |
| 359 |
< |
qsort(div, ne, sizeof(AMBSAMP), ambcmp); |
| 360 |
< |
/* skim excess */ |
| 361 |
< |
while (ne > ns) { |
| 362 |
< |
ne--; |
| 363 |
< |
addcolor(acol, div[ne].v); |
| 364 |
< |
} |
| 365 |
< |
/* super-sample */ |
| 366 |
< |
for (i = ns; i > 0; i--) { |
| 367 |
< |
rayorigin(&ar, r, AMBIENT, 0.5); /* pretested */ |
| 368 |
< |
zd = sqrt((div[0].t+frandom())/nt); |
| 369 |
< |
phi = 2.0*PI * (div[0].p+frandom())/np; |
| 370 |
< |
xd = cos(phi) * zd; |
| 371 |
< |
yd = sin(phi) * zd; |
| 372 |
< |
zd = sqrt(1.0 - zd*zd); |
| 373 |
< |
for (k = 0; k < 3; k++) |
| 374 |
< |
ar.rdir[k] = xd*ux[k]+yd*uy[k]+zd*r->ron[k]; |
| 375 |
< |
rayvalue(&ar); |
| 376 |
< |
if (ar.rot < FHUGE) |
| 377 |
< |
arad += 1.0 / ar.rot; |
| 378 |
< |
/* recompute error */ |
| 379 |
< |
copycolor(dnew.v, div[0].v); |
| 380 |
< |
addcolor(dnew.v, ar.rcol); |
| 381 |
< |
dnew.n = div[0].n + 1; |
| 382 |
< |
dnew.t = div[0].t; dnew.p = div[0].p; |
| 383 |
< |
b2 = bright(dnew.v)/dnew.n - bright(ar.rcol); |
| 384 |
< |
b2 = b2*b2 + div[0].k*(div[0].n*div[0].n); |
| 385 |
< |
dnew.k = b2/(dnew.n*dnew.n); |
| 386 |
< |
/* reinsert */ |
| 387 |
< |
for (k = 0; k < ne-1 && dnew.k < div[k+1].k; k++) |
| 388 |
< |
bcopy(&div[k+1], &div[k], sizeof(AMBSAMP)); |
| 389 |
< |
bcopy(&dnew, &div[k], sizeof(AMBSAMP)); |
| 390 |
< |
|
| 391 |
< |
if (ne >= i) { /* extract darkest division */ |
| 392 |
< |
ne--; |
| 393 |
< |
if (div[ne].n > 1) |
| 394 |
< |
scalecolor(div[ne].v, 1.0/div[ne].n); |
| 395 |
< |
addcolor(acol, div[ne].v); |
| 396 |
< |
} |
| 397 |
< |
} |
| 398 |
< |
scalecolor(acol, 1.0/ndivs); |
| 399 |
< |
if (arad <= FTINY) |
| 400 |
< |
arad = FHUGE; |
| 401 |
< |
else |
| 402 |
< |
arad = (ndivs+ns) / arad / sqrt(r->rweight); |
| 403 |
< |
if (arad > maxarad) |
| 404 |
< |
arad = maxarad; |
| 405 |
< |
else if (arad < minarad) |
| 406 |
< |
arad = minarad; |
| 407 |
< |
if (ns > 0) |
| 408 |
< |
free((char *)div); |
| 409 |
< |
return(arad); |
| 365 |
> |
copycolor(cr, ap->val); |
| 366 |
> |
scalecolor(cr, d); |
| 367 |
|
} |
| 368 |
|
|
| 369 |
|
|
| 370 |
< |
static int |
| 371 |
< |
ambcmp(d1, d2) /* decreasing order */ |
| 372 |
< |
AMBSAMP *d1, *d2; |
| 370 |
> |
static |
| 371 |
> |
initambfile(creat) /* initialize ambient file */ |
| 372 |
> |
int creat; |
| 373 |
|
{ |
| 374 |
< |
if (d1->k < d2->k) |
| 375 |
< |
return(1); |
| 376 |
< |
if (d1->k > d2->k) |
| 377 |
< |
return(-1); |
| 378 |
< |
return(0); |
| 374 |
> |
extern char *progname, *octname, VersionID[]; |
| 375 |
> |
|
| 376 |
> |
#ifdef F_SETLKW |
| 377 |
> |
aflock(creat ? F_WRLCK : F_RDLCK); |
| 378 |
> |
#endif |
| 379 |
> |
#ifdef MSDOS |
| 380 |
> |
setmode(fileno(ambfp), O_BINARY); |
| 381 |
> |
#endif |
| 382 |
> |
setbuf(ambfp, bmalloc(BUFSIZ+8)); |
| 383 |
> |
if (creat) { /* new file */ |
| 384 |
> |
newheader("RADIANCE", ambfp); |
| 385 |
> |
fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ", |
| 386 |
> |
progname, colval(ambval,RED), |
| 387 |
> |
colval(ambval,GRN), colval(ambval,BLU), |
| 388 |
> |
ambounce, ambacc); |
| 389 |
> |
fprintf(ambfp, "-ad %d -as %d -ar %d %s\n", |
| 390 |
> |
ambdiv, ambssamp, ambres, |
| 391 |
> |
octname==NULL ? "" : octname); |
| 392 |
> |
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
| 393 |
> |
fputformat(AMBFMT, ambfp); |
| 394 |
> |
putc('\n', ambfp); |
| 395 |
> |
putambmagic(ambfp); |
| 396 |
> |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
| 397 |
> |
error(USER, "bad ambient file"); |
| 398 |
|
} |
| 399 |
|
|
| 400 |
|
|
| 401 |
|
static |
| 402 |
< |
avsave(av) /* save an ambient value */ |
| 403 |
< |
AMBVAL *av; |
| 402 |
> |
avsave(av) /* insert and save an ambient value */ |
| 403 |
> |
AMBVAL *av; |
| 404 |
|
{ |
| 405 |
< |
#ifdef AMBFLUSH |
| 430 |
< |
static int nunflshed = 0; |
| 431 |
< |
#endif |
| 405 |
> |
avinsert(avstore(av)); |
| 406 |
|
if (ambfp == NULL) |
| 407 |
|
return; |
| 408 |
< |
if (fwrite(av, sizeof(AMBVAL), 1, ambfp) != 1) |
| 408 |
> |
if (writambval(av, ambfp) < 0) |
| 409 |
|
goto writerr; |
| 410 |
< |
#ifdef AMBFLUSH |
| 411 |
< |
if (++nunflshed >= AMBFLUSH) { |
| 438 |
< |
if (fflush(ambfp) == EOF) |
| 410 |
> |
if (++nunflshed >= AMBFLUSH) |
| 411 |
> |
if (ambsync() == EOF) |
| 412 |
|
goto writerr; |
| 440 |
– |
nunflshed = 0; |
| 441 |
– |
} |
| 442 |
– |
#endif |
| 413 |
|
return; |
| 414 |
|
writerr: |
| 415 |
|
error(SYSTEM, "error writing ambient file"); |
| 416 |
|
} |
| 417 |
|
|
| 418 |
|
|
| 419 |
+ |
static AMBVAL * |
| 420 |
+ |
avstore(aval) /* allocate memory and store aval */ |
| 421 |
+ |
register AMBVAL *aval; |
| 422 |
+ |
{ |
| 423 |
+ |
register AMBVAL *av; |
| 424 |
+ |
|
| 425 |
+ |
if ((av = newambval()) == NULL) |
| 426 |
+ |
error(SYSTEM, "out of memory in avstore"); |
| 427 |
+ |
copystruct(av, aval); |
| 428 |
+ |
av->latick = ambclock; |
| 429 |
+ |
av->next = NULL; |
| 430 |
+ |
nambvals++; |
| 431 |
+ |
return(av); |
| 432 |
+ |
} |
| 433 |
+ |
|
| 434 |
+ |
|
| 435 |
+ |
#define ATALLOCSZ 512 /* #/8 trees to allocate at once */ |
| 436 |
+ |
|
| 437 |
+ |
static AMBTREE *atfreelist = NULL; /* free ambient tree structures */ |
| 438 |
+ |
|
| 439 |
+ |
|
| 440 |
|
static |
| 441 |
< |
avinsert(aval, at, c0, s) /* insert ambient value in a tree */ |
| 442 |
< |
AMBVAL *aval; |
| 452 |
< |
register AMBTREE *at; |
| 453 |
< |
FVECT c0; |
| 454 |
< |
double s; |
| 441 |
> |
AMBTREE * |
| 442 |
> |
newambtree() /* allocate 8 ambient tree structs */ |
| 443 |
|
{ |
| 444 |
+ |
register AMBTREE *atp, *upperlim; |
| 445 |
+ |
|
| 446 |
+ |
if (atfreelist == NULL) { /* get more nodes */ |
| 447 |
+ |
atfreelist = (AMBTREE *)bmalloc(ATALLOCSZ*8*sizeof(AMBTREE)); |
| 448 |
+ |
if (atfreelist == NULL) |
| 449 |
+ |
return(NULL); |
| 450 |
+ |
/* link new free list */ |
| 451 |
+ |
upperlim = atfreelist + 8*(ATALLOCSZ-1); |
| 452 |
+ |
for (atp = atfreelist; atp < upperlim; atp += 8) |
| 453 |
+ |
atp->kid = atp + 8; |
| 454 |
+ |
atp->kid = NULL; |
| 455 |
+ |
} |
| 456 |
+ |
atp = atfreelist; |
| 457 |
+ |
atfreelist = atp->kid; |
| 458 |
+ |
bzero((char *)atp, 8*sizeof(AMBTREE)); |
| 459 |
+ |
return(atp); |
| 460 |
+ |
} |
| 461 |
+ |
|
| 462 |
+ |
|
| 463 |
+ |
static |
| 464 |
+ |
freeambtree(atp) /* free 8 ambient tree structs */ |
| 465 |
+ |
AMBTREE *atp; |
| 466 |
+ |
{ |
| 467 |
+ |
atp->kid = atfreelist; |
| 468 |
+ |
atfreelist = atp; |
| 469 |
+ |
} |
| 470 |
+ |
|
| 471 |
+ |
|
| 472 |
+ |
static |
| 473 |
+ |
avinsert(av) /* insert ambient value in our tree */ |
| 474 |
+ |
register AMBVAL *av; |
| 475 |
+ |
{ |
| 476 |
+ |
register AMBTREE *at; |
| 477 |
+ |
register AMBVAL *ap; |
| 478 |
+ |
AMBVAL avh; |
| 479 |
|
FVECT ck0; |
| 480 |
+ |
double s; |
| 481 |
|
int branch; |
| 458 |
– |
register AMBVAL *av; |
| 482 |
|
register int i; |
| 483 |
|
|
| 484 |
< |
if ((av = newambval()) == NULL) |
| 485 |
< |
goto memerr; |
| 486 |
< |
bcopy(aval, av, sizeof(AMBVAL)); |
| 487 |
< |
VCOPY(ck0, c0); |
| 484 |
> |
if (av->rad <= FTINY) |
| 485 |
> |
error(CONSISTENCY, "zero ambient radius in avinsert"); |
| 486 |
> |
at = &atrunk; |
| 487 |
> |
VCOPY(ck0, thescene.cuorg); |
| 488 |
> |
s = thescene.cusize; |
| 489 |
|
while (s*(OCTSCALE/2) > av->rad*ambacc) { |
| 490 |
|
if (at->kid == NULL) |
| 491 |
|
if ((at->kid = newambtree()) == NULL) |
| 492 |
< |
goto memerr; |
| 492 |
> |
error(SYSTEM, "out of memory in avinsert"); |
| 493 |
|
s *= 0.5; |
| 494 |
|
branch = 0; |
| 495 |
|
for (i = 0; i < 3; i++) |
| 499 |
|
} |
| 500 |
|
at = at->kid + branch; |
| 501 |
|
} |
| 502 |
< |
av->next = at->alist; |
| 503 |
< |
at->alist = av; |
| 504 |
< |
return; |
| 505 |
< |
memerr: |
| 506 |
< |
error(SYSTEM, "out of memory in avinsert"); |
| 502 |
> |
avh.next = at->alist; /* order by increasing level */ |
| 503 |
> |
for (ap = &avh; ap->next != NULL; ap = ap->next) |
| 504 |
> |
if (ap->next->lvl >= av->lvl) |
| 505 |
> |
break; |
| 506 |
> |
av->next = ap->next; |
| 507 |
> |
ap->next = av; |
| 508 |
> |
at->alist = avh.next; |
| 509 |
|
} |
| 510 |
+ |
|
| 511 |
+ |
|
| 512 |
+ |
static |
| 513 |
+ |
unloadatree(at, f) /* unload an ambient value tree */ |
| 514 |
+ |
register AMBTREE *at; |
| 515 |
+ |
int (*f)(); |
| 516 |
+ |
{ |
| 517 |
+ |
register AMBVAL *av; |
| 518 |
+ |
register int i; |
| 519 |
+ |
/* transfer values at this node */ |
| 520 |
+ |
for (av = at->alist; av != NULL; av = at->alist) { |
| 521 |
+ |
at->alist = av->next; |
| 522 |
+ |
(*f)(av); |
| 523 |
+ |
} |
| 524 |
+ |
if (at->kid == NULL) |
| 525 |
+ |
return; |
| 526 |
+ |
for (i = 0; i < 8; i++) /* transfer and free children */ |
| 527 |
+ |
unloadatree(at->kid+i, f); |
| 528 |
+ |
freeambtree(at->kid); |
| 529 |
+ |
at->kid = NULL; |
| 530 |
+ |
} |
| 531 |
+ |
|
| 532 |
+ |
|
| 533 |
+ |
static AMBVAL **avlist1, **avlist2; /* ambient value lists for sorting */ |
| 534 |
+ |
static int i_avlist; /* index for lists */ |
| 535 |
+ |
|
| 536 |
+ |
|
| 537 |
+ |
static |
| 538 |
+ |
av2list(av) |
| 539 |
+ |
AMBVAL *av; |
| 540 |
+ |
{ |
| 541 |
+ |
#ifdef DEBUG |
| 542 |
+ |
if (i_avlist >= nambvals) |
| 543 |
+ |
error(CONSISTENCY, "too many ambient values in av2list1"); |
| 544 |
+ |
#endif |
| 545 |
+ |
avlist1[i_avlist] = avlist2[i_avlist] = av; |
| 546 |
+ |
i_avlist++; |
| 547 |
+ |
} |
| 548 |
+ |
|
| 549 |
+ |
|
| 550 |
+ |
static int |
| 551 |
+ |
alatcmp(avp1, avp2) /* compare ambient values for MRA */ |
| 552 |
+ |
AMBVAL **avp1, **avp2; |
| 553 |
+ |
{ |
| 554 |
+ |
return((**avp2).latick - (**avp1).latick); |
| 555 |
+ |
} |
| 556 |
+ |
|
| 557 |
+ |
|
| 558 |
+ |
static int |
| 559 |
+ |
aposcmp(avp1, avp2) /* compare ambient value positions */ |
| 560 |
+ |
AMBVAL **avp1, **avp2; |
| 561 |
+ |
{ |
| 562 |
+ |
return(*avp1 - *avp2); |
| 563 |
+ |
} |
| 564 |
+ |
|
| 565 |
+ |
|
| 566 |
+ |
#ifdef DEBUG |
| 567 |
+ |
static int |
| 568 |
+ |
avlmemi(avaddr) /* find list position from address */ |
| 569 |
+ |
AMBVAL *avaddr; |
| 570 |
+ |
{ |
| 571 |
+ |
register AMBVAL **avlpp; |
| 572 |
+ |
|
| 573 |
+ |
avlpp = (AMBVAL **)bsearch((char *)&avaddr, (char *)avlist2, |
| 574 |
+ |
nambvals, sizeof(AMBVAL *), aposcmp); |
| 575 |
+ |
if (avlpp == NULL) |
| 576 |
+ |
error(CONSISTENCY, "address not found in avlmemi"); |
| 577 |
+ |
return(avlpp - avlist2); |
| 578 |
+ |
} |
| 579 |
+ |
#else |
| 580 |
+ |
#define avlmemi(avaddr) ((AMBVAL **)bsearch((char *)&avaddr,(char *)avlist2, \ |
| 581 |
+ |
nambvals,sizeof(AMBVAL *),aposcmp) - avlist2) |
| 582 |
+ |
#endif |
| 583 |
+ |
|
| 584 |
+ |
|
| 585 |
+ |
static |
| 586 |
+ |
sortambvals(always) /* resort ambient values */ |
| 587 |
+ |
int always; |
| 588 |
+ |
{ |
| 589 |
+ |
AMBTREE oldatrunk; |
| 590 |
+ |
AMBVAL tav, *tap, *pnext; |
| 591 |
+ |
register int i, j; |
| 592 |
+ |
/* see if it's time yet */ |
| 593 |
+ |
if (!always && (ambclock < lastsort+sortintvl || |
| 594 |
+ |
nambvals < SORT_THRESH)) |
| 595 |
+ |
return; |
| 596 |
+ |
/* |
| 597 |
+ |
* The idea here is to minimize memory thrashing |
| 598 |
+ |
* in VM systems by improving reference locality. |
| 599 |
+ |
* We do this by periodically sorting our stored ambient |
| 600 |
+ |
* values in memory in order of most recently to least |
| 601 |
+ |
* recently accessed. This ordering was chosen so that new |
| 602 |
+ |
* ambient values (which tend to be less important) go into |
| 603 |
+ |
* higher memory with the infrequently accessed values. |
| 604 |
+ |
* Since we expect our values to need sorting less |
| 605 |
+ |
* frequently as the process continues, we double our |
| 606 |
+ |
* waiting interval after each call. |
| 607 |
+ |
* This routine is also called by setambacc() with |
| 608 |
+ |
* the "always" parameter set to 1 so that the ambient |
| 609 |
+ |
* tree will be rebuilt with the new accuracy parameter. |
| 610 |
+ |
*/ |
| 611 |
+ |
if (tracktime) { /* allocate pointer arrays to sort */ |
| 612 |
+ |
avlist1 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *)); |
| 613 |
+ |
avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *)); |
| 614 |
+ |
} else |
| 615 |
+ |
avlist1 = avlist2 = NULL; |
| 616 |
+ |
if (avlist2 == NULL) { /* no time tracking -- rebuild tree? */ |
| 617 |
+ |
if (avlist1 != NULL) |
| 618 |
+ |
free((char *)avlist1); |
| 619 |
+ |
if (always) { /* rebuild without sorting */ |
| 620 |
+ |
copystruct(&oldatrunk, &atrunk); |
| 621 |
+ |
atrunk.alist = NULL; |
| 622 |
+ |
atrunk.kid = NULL; |
| 623 |
+ |
unloadatree(&oldatrunk, avinsert); |
| 624 |
+ |
} |
| 625 |
+ |
} else { /* sort memory by last access time */ |
| 626 |
+ |
/* |
| 627 |
+ |
* Sorting memory is tricky because it isn't contiguous. |
| 628 |
+ |
* We have to sort an array of pointers by MRA and also |
| 629 |
+ |
* by memory position. We then copy values in "loops" |
| 630 |
+ |
* to minimize memory hits. Nevertheless, we will visit |
| 631 |
+ |
* everyone at least twice, and this is an expensive process |
| 632 |
+ |
* when we're thrashing, which is when we need to do it. |
| 633 |
+ |
*/ |
| 634 |
+ |
#ifdef DEBUG |
| 635 |
+ |
sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...", |
| 636 |
+ |
nambvals, ambclock); |
| 637 |
+ |
eputs(errmsg); |
| 638 |
+ |
#endif |
| 639 |
+ |
i_avlist = 0; |
| 640 |
+ |
unloadatree(&atrunk, av2list); /* empty current tree */ |
| 641 |
+ |
#ifdef DEBUG |
| 642 |
+ |
if (i_avlist < nambvals) |
| 643 |
+ |
error(CONSISTENCY, "missing ambient values in sortambvals"); |
| 644 |
+ |
#endif |
| 645 |
+ |
qsort((char *)avlist1, nambvals, sizeof(AMBVAL *), alatcmp); |
| 646 |
+ |
qsort((char *)avlist2, nambvals, sizeof(AMBVAL *), aposcmp); |
| 647 |
+ |
for (i = 0; i < nambvals; i++) { |
| 648 |
+ |
if (avlist1[i] == NULL) |
| 649 |
+ |
continue; |
| 650 |
+ |
tap = avlist2[i]; |
| 651 |
+ |
copystruct(&tav, tap); |
| 652 |
+ |
for (j = i; (pnext = avlist1[j]) != tap; |
| 653 |
+ |
j = avlmemi(pnext)) { |
| 654 |
+ |
copystruct(avlist2[j], pnext); |
| 655 |
+ |
avinsert(avlist2[j]); |
| 656 |
+ |
avlist1[j] = NULL; |
| 657 |
+ |
} |
| 658 |
+ |
copystruct(avlist2[j], &tav); |
| 659 |
+ |
avinsert(avlist2[j]); |
| 660 |
+ |
avlist1[j] = NULL; |
| 661 |
+ |
} |
| 662 |
+ |
free((char *)avlist1); |
| 663 |
+ |
free((char *)avlist2); |
| 664 |
+ |
/* compute new sort interval */ |
| 665 |
+ |
sortintvl = ambclock - lastsort; |
| 666 |
+ |
if (sortintvl > MAX_SORT_INTVL) |
| 667 |
+ |
sortintvl = MAX_SORT_INTVL; |
| 668 |
+ |
else |
| 669 |
+ |
sortintvl <<= 1; /* wait twice as long next */ |
| 670 |
+ |
#ifdef DEBUG |
| 671 |
+ |
eputs("done\n"); |
| 672 |
+ |
#endif |
| 673 |
+ |
} |
| 674 |
+ |
if (ambclock >= MAXACLOCK) |
| 675 |
+ |
ambclock = MAXACLOCK/2; |
| 676 |
+ |
lastsort = ambclock; |
| 677 |
+ |
} |
| 678 |
+ |
|
| 679 |
+ |
|
| 680 |
+ |
#ifdef F_SETLKW |
| 681 |
+ |
|
| 682 |
+ |
static |
| 683 |
+ |
aflock(typ) /* lock/unlock ambient file */ |
| 684 |
+ |
int typ; |
| 685 |
+ |
{ |
| 686 |
+ |
static struct flock fls; /* static so initialized to zeroes */ |
| 687 |
+ |
|
| 688 |
+ |
fls.l_type = typ; |
| 689 |
+ |
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
| 690 |
+ |
error(SYSTEM, "cannot (un)lock ambient file"); |
| 691 |
+ |
} |
| 692 |
+ |
|
| 693 |
+ |
|
| 694 |
+ |
int |
| 695 |
+ |
ambsync() /* synchronize ambient file */ |
| 696 |
+ |
{ |
| 697 |
+ |
static FILE *ambinp = NULL; |
| 698 |
+ |
static long lastpos = -1; |
| 699 |
+ |
long flen; |
| 700 |
+ |
AMBVAL avs; |
| 701 |
+ |
register int n; |
| 702 |
+ |
|
| 703 |
+ |
if (nunflshed == 0) |
| 704 |
+ |
return(0); |
| 705 |
+ |
if (lastpos < 0) /* initializing (locked in initambfile) */ |
| 706 |
+ |
goto syncend; |
| 707 |
+ |
/* gain exclusive access */ |
| 708 |
+ |
aflock(F_WRLCK); |
| 709 |
+ |
/* see if file has grown */ |
| 710 |
+ |
if ((flen = lseek(fileno(ambfp), 0L, 2)) < 0) |
| 711 |
+ |
goto seekerr; |
| 712 |
+ |
if (n = flen - lastpos) { /* file has grown */ |
| 713 |
+ |
if (ambinp == NULL) { /* use duplicate filedes */ |
| 714 |
+ |
ambinp = fdopen(dup(fileno(ambfp)), "r"); |
| 715 |
+ |
if (ambinp == NULL) |
| 716 |
+ |
error(SYSTEM, "fdopen failed in ambsync"); |
| 717 |
+ |
} |
| 718 |
+ |
if (fseek(ambinp, lastpos, 0) < 0) |
| 719 |
+ |
goto seekerr; |
| 720 |
+ |
while (n >= AMBVALSIZ) { /* load contributed values */ |
| 721 |
+ |
readambval(&avs, ambinp); |
| 722 |
+ |
avinsert(avstore(&avs)); |
| 723 |
+ |
n -= AMBVALSIZ; |
| 724 |
+ |
} |
| 725 |
+ |
/*** seek always as safety measure |
| 726 |
+ |
if (n) ***/ /* alignment */ |
| 727 |
+ |
if (lseek(fileno(ambfp), flen-n, 0) < 0) |
| 728 |
+ |
goto seekerr; |
| 729 |
+ |
} |
| 730 |
+ |
#ifdef DEBUG |
| 731 |
+ |
if (ambfp->_ptr - ambfp->_base != nunflshed*AMBVALSIZ) { |
| 732 |
+ |
sprintf(errmsg, "ambient file buffer at %d rather than %d", |
| 733 |
+ |
ambfp->_ptr - ambfp->_base, |
| 734 |
+ |
nunflshed*AMBVALSIZ); |
| 735 |
+ |
error(CONSISTENCY, errmsg); |
| 736 |
+ |
} |
| 737 |
+ |
#endif |
| 738 |
+ |
syncend: |
| 739 |
+ |
n = fflush(ambfp); /* calls write() at last */ |
| 740 |
+ |
if ((lastpos = lseek(fileno(ambfp), 0L, 1)) < 0) |
| 741 |
+ |
goto seekerr; |
| 742 |
+ |
aflock(F_UNLCK); /* release file */ |
| 743 |
+ |
nunflshed = 0; |
| 744 |
+ |
return(n); |
| 745 |
+ |
seekerr: |
| 746 |
+ |
error(SYSTEM, "seek failed in ambsync"); |
| 747 |
+ |
} |
| 748 |
+ |
|
| 749 |
+ |
#else |
| 750 |
+ |
|
| 751 |
+ |
int |
| 752 |
+ |
ambsync() /* flush ambient file */ |
| 753 |
+ |
{ |
| 754 |
+ |
if (nunflshed == 0) |
| 755 |
+ |
return(0); |
| 756 |
+ |
nunflshed = 0; |
| 757 |
+ |
return(fflush(ambfp)); |
| 758 |
+ |
} |
| 759 |
+ |
|
| 760 |
+ |
#endif |
