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/* Copyright (c) 1991 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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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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* Declarations of external symbols in ambient.h |
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*/ |
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|
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< |
#include "ray.h" |
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#include "copyright.h" |
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|
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< |
#include "octree.h" |
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> |
#include <string.h> |
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|
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#include "platform.h" |
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#include "ray.h" |
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#include "otypes.h" |
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|
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#include "resolu.h" |
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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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#ifndef OCTSCALE |
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> |
#define OCTSCALE 1.0 /* ceil((valid rad.)/(cube size)) */ |
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#endif |
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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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> |
extern char *shm_boundary; /* memory sharing boundary */ |
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|
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< |
extern CUBE thescene; /* contains space boundaries */ |
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> |
#ifndef MAXASET |
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> |
#define MAXASET 2047 /* maximum number of elements in ambient set */ |
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> |
#endif |
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> |
OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
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|
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< |
#define MAXASET 511 /* maximum number of elements in ambient set */ |
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OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
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> |
double maxarad; /* maximum ambient radius */ |
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> |
double minarad; /* minimum ambient radius */ |
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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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> |
static AMBTREE atrunk; /* our ambient trunk node */ |
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|
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static AMBTREE atrunk; /* our ambient trunk node */ |
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|
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static FILE *ambfp = NULL; /* ambient file pointer */ |
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static int nunflshed = 0; /* number of unflushed ambient values */ |
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|
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< |
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
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> |
#ifndef SORT_THRESH |
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> |
#ifdef SMLMEM |
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> |
#define SORT_THRESH ((3L<<20)/sizeof(AMBVAL)) |
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> |
#else |
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> |
#define SORT_THRESH ((9L<<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<<1) |
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> |
#endif |
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> |
#ifndef MAX_SORT_INTVL |
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> |
#define MAX_SORT_INTVL (SORT_INTVL<<6) |
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> |
#endif |
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|
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< |
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
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> |
static double avsum = 0.; /* computed ambient value sum (log) */ |
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> |
static unsigned int navsum = 0; /* number of values in avsum */ |
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> |
static unsigned int nambvals = 0; /* total number of indirect values */ |
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> |
static unsigned int nambshare = 0; /* number of values from file */ |
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> |
static unsigned long ambclock = 0; /* ambient access clock */ |
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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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static FILE *ambinp = NULL; /* auxiliary file for input */ |
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static long lastpos = -1; /* last flush position */ |
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|
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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). Go ahead anyway |
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* if more than two thirds of our values are unshared. |
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* Compile with -Dtracktime=0 to turn this code off. |
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*/ |
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#ifndef tracktime |
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#define tracktime (shm_boundary == NULL || nambvals > 3*nambshare) |
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#endif |
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|
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setambient(afile) /* initialize calculation */ |
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char *afile; |
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> |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
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> |
|
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> |
#define newambval() (AMBVAL *)malloc(sizeof(AMBVAL)) |
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> |
#define freeav(av) free((void *)av); |
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> |
|
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> |
static void initambfile(int creat); |
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> |
static void avsave(AMBVAL *av); |
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> |
static AMBVAL *avstore(AMBVAL *aval); |
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> |
static AMBTREE *newambtree(void); |
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> |
static void freeambtree(AMBTREE *atp); |
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|
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typedef void unloadtf_t(void *); |
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> |
static unloadtf_t avinsert; |
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> |
static unloadtf_t av2list; |
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> |
static void unloadatree(AMBTREE *at, unloadtf_t *f); |
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> |
|
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> |
static int aposcmp(const void *avp1, const void *avp2); |
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> |
static int avlmemi(AMBVAL *avaddr); |
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> |
static void sortambvals(int always); |
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> |
|
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> |
#ifdef F_SETLKW |
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> |
static void aflock(int typ); |
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> |
#endif |
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> |
|
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> |
|
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> |
extern void |
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> |
setambres( /* set ambient resolution */ |
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> |
int ar |
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> |
) |
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{ |
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< |
long ftell(); |
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AMBVAL amb; |
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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; |
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> |
maxarad = thescene.cusize / 2.0; |
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> |
} else { |
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> |
minarad = thescene.cusize / ar; |
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maxarad = 64 * minarad; /* heuristic */ |
| 114 |
> |
if (maxarad > thescene.cusize / 2.0) |
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> |
maxarad = thescene.cusize / 2.0; |
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> |
} |
| 117 |
> |
if (minarad <= FTINY) |
| 118 |
> |
minarad = 10*FTINY; |
| 119 |
> |
if (maxarad <= minarad) |
| 120 |
> |
maxarad = 64 * minarad; |
| 121 |
> |
} |
| 122 |
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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; |
| 123 |
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|
| 124 |
< |
/* open ambient file */ |
| 125 |
< |
if (afile != NULL) |
| 126 |
< |
if ((ambfp = fopen(afile, "r+")) != NULL) { |
| 127 |
< |
while (fread((char *)&amb,sizeof(AMBVAL),1,ambfp) == 1) |
| 128 |
< |
avinsert(&amb, &atrunk, thescene.cuorg, |
| 129 |
< |
thescene.cusize); |
| 130 |
< |
/* align */ |
| 131 |
< |
fseek(ambfp, -(ftell(ambfp)%sizeof(AMBVAL)), 1); |
| 132 |
< |
} else if ((ambfp = fopen(afile, "w")) == NULL) { |
| 133 |
< |
sprintf(errmsg, "cannot open ambient file \"%s\"", |
| 134 |
< |
afile); |
| 135 |
< |
error(SYSTEM, errmsg); |
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> |
extern void |
| 125 |
> |
setambacc( /* set ambient accuracy */ |
| 126 |
> |
double newa |
| 127 |
> |
) |
| 128 |
> |
{ |
| 129 |
> |
double ambdiff; |
| 130 |
> |
|
| 131 |
> |
if (newa < 0.0) |
| 132 |
> |
newa = 0.0; |
| 133 |
> |
ambdiff = fabs(newa - ambacc); |
| 134 |
> |
if (ambdiff >= .01 && (ambacc = newa) > FTINY && nambvals > 0) |
| 135 |
> |
sortambvals(1); /* rebuild tree */ |
| 136 |
> |
} |
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> |
|
| 138 |
> |
|
| 139 |
> |
extern void |
| 140 |
> |
setambient(void) /* initialize calculation */ |
| 141 |
> |
{ |
| 142 |
> |
int readonly = 0; |
| 143 |
> |
long pos, flen; |
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> |
AMBVAL amb; |
| 145 |
> |
/* make sure we're fresh */ |
| 146 |
> |
ambdone(); |
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> |
/* init ambient limits */ |
| 148 |
> |
setambres(ambres); |
| 149 |
> |
setambacc(ambacc); |
| 150 |
> |
if (ambfile == NULL || !ambfile[0]) |
| 151 |
> |
return; |
| 152 |
> |
if (ambacc <= FTINY) { |
| 153 |
> |
sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened", |
| 154 |
> |
ambfile); |
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> |
error(WARNING, errmsg); |
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> |
return; |
| 157 |
> |
} |
| 158 |
> |
/* open ambient file */ |
| 159 |
> |
if ((ambfp = fopen(ambfile, "r+")) == NULL) |
| 160 |
> |
readonly = (ambfp = fopen(ambfile, "r")) != NULL; |
| 161 |
> |
if (ambfp != NULL) { |
| 162 |
> |
initambfile(0); /* file exists */ |
| 163 |
> |
pos = ftell(ambfp); |
| 164 |
> |
while (readambval(&amb, ambfp)) |
| 165 |
> |
avinsert(avstore(&amb)); |
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> |
nambshare = nambvals; /* share loaded values */ |
| 167 |
> |
if (readonly) { |
| 168 |
> |
sprintf(errmsg, |
| 169 |
> |
"loaded %u values from read-only ambient file", |
| 170 |
> |
nambvals); |
| 171 |
> |
error(WARNING, errmsg); |
| 172 |
> |
fclose(ambfp); /* close file so no writes */ |
| 173 |
> |
ambfp = NULL; |
| 174 |
> |
return; /* avoid ambsync() */ |
| 175 |
|
} |
| 176 |
+ |
/* align file pointer */ |
| 177 |
+ |
pos += (long)nambvals*AMBVALSIZ; |
| 178 |
+ |
flen = lseek(fileno(ambfp), (off_t)0, SEEK_END); |
| 179 |
+ |
if (flen != pos) { |
| 180 |
+ |
sprintf(errmsg, |
| 181 |
+ |
"ignoring last %ld values in ambient file (corrupted)", |
| 182 |
+ |
(flen - pos)/AMBVALSIZ); |
| 183 |
+ |
error(WARNING, errmsg); |
| 184 |
+ |
fseek(ambfp, pos, 0); |
| 185 |
+ |
#ifndef _WIN32 /* XXX we need a replacement for that one */ |
| 186 |
+ |
ftruncate(fileno(ambfp), (off_t)pos); |
| 187 |
+ |
#endif |
| 188 |
+ |
} |
| 189 |
+ |
} else if ((ambfp = fopen(ambfile, "w+")) != NULL) { |
| 190 |
+ |
initambfile(1); /* else create new file */ |
| 191 |
+ |
} else { |
| 192 |
+ |
sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile); |
| 193 |
+ |
error(SYSTEM, errmsg); |
| 194 |
+ |
} |
| 195 |
+ |
nunflshed++; /* lie */ |
| 196 |
+ |
ambsync(); |
| 197 |
|
} |
| 198 |
|
|
| 199 |
|
|
| 200 |
< |
ambnotify(obj) /* record new modifier */ |
| 201 |
< |
OBJECT obj; |
| 200 |
> |
extern void |
| 201 |
> |
ambdone(void) /* close ambient file and free memory */ |
| 202 |
|
{ |
| 203 |
+ |
if (ambfp != NULL) { /* close ambient file */ |
| 204 |
+ |
ambsync(); |
| 205 |
+ |
fclose(ambfp); |
| 206 |
+ |
ambfp = NULL; |
| 207 |
+ |
if (ambinp != NULL) { |
| 208 |
+ |
fclose(ambinp); |
| 209 |
+ |
ambinp = NULL; |
| 210 |
+ |
} |
| 211 |
+ |
lastpos = -1; |
| 212 |
+ |
} |
| 213 |
+ |
/* free ambient tree */ |
| 214 |
+ |
unloadatree(&atrunk, free); |
| 215 |
+ |
/* reset state variables */ |
| 216 |
+ |
avsum = 0.; |
| 217 |
+ |
navsum = 0; |
| 218 |
+ |
nambvals = 0; |
| 219 |
+ |
nambshare = 0; |
| 220 |
+ |
ambclock = 0; |
| 221 |
+ |
lastsort = 0; |
| 222 |
+ |
sortintvl = SORT_INTVL; |
| 223 |
+ |
} |
| 224 |
+ |
|
| 225 |
+ |
|
| 226 |
+ |
extern void |
| 227 |
+ |
ambnotify( /* record new modifier */ |
| 228 |
+ |
OBJECT obj |
| 229 |
+ |
) |
| 230 |
+ |
{ |
| 231 |
|
static int hitlimit = 0; |
| 232 |
< |
register OBJREC *o = objptr(obj); |
| 232 |
> |
register OBJREC *o; |
| 233 |
|
register char **amblp; |
| 234 |
|
|
| 235 |
+ |
if (obj == OVOID) { /* starting over */ |
| 236 |
+ |
ambset[0] = 0; |
| 237 |
+ |
hitlimit = 0; |
| 238 |
+ |
return; |
| 239 |
+ |
} |
| 240 |
+ |
o = objptr(obj); |
| 241 |
|
if (hitlimit || !ismodifier(o->otype)) |
| 242 |
|
return; |
| 243 |
|
for (amblp = amblist; *amblp != NULL; amblp++) |
| 253 |
|
} |
| 254 |
|
|
| 255 |
|
|
| 256 |
< |
ambient(acol, r) /* compute ambient component for ray */ |
| 257 |
< |
COLOR acol; |
| 258 |
< |
register RAY *r; |
| 256 |
> |
extern void |
| 257 |
> |
multambient( /* compute ambient component & multiply by coef. */ |
| 258 |
> |
COLOR aval, |
| 259 |
> |
register RAY *r, |
| 260 |
> |
FVECT nrm |
| 261 |
> |
) |
| 262 |
|
{ |
| 263 |
|
static int rdepth = 0; /* ambient recursion */ |
| 264 |
< |
double d; |
| 264 |
> |
COLOR acol; |
| 265 |
> |
double d, l; |
| 266 |
|
|
| 267 |
|
if (ambdiv <= 0) /* no ambient calculation */ |
| 268 |
|
goto dumbamb; |
| 276 |
|
|
| 277 |
|
if (ambacc <= FTINY) { /* no ambient storage */ |
| 278 |
|
rdepth++; |
| 279 |
< |
d = doambient(acol, r, r->rweight, NULL, NULL); |
| 279 |
> |
d = doambient(acol, r, aval, intens(aval)*r->rweight, |
| 280 |
> |
NULL, NULL); |
| 281 |
|
rdepth--; |
| 282 |
< |
if (d == 0.0) |
| 282 |
> |
if (d <= FTINY) |
| 283 |
|
goto dumbamb; |
| 284 |
+ |
multcolor(aval, acol); |
| 285 |
|
return; |
| 286 |
|
} |
| 287 |
+ |
|
| 288 |
+ |
if (tracktime) /* sort to minimize thrashing */ |
| 289 |
+ |
sortambvals(0); |
| 290 |
|
/* get ambient value */ |
| 291 |
|
setcolor(acol, 0.0, 0.0, 0.0); |
| 292 |
< |
d = sumambient(acol, r, rdepth, |
| 292 |
> |
d = sumambient(acol, r, nrm, rdepth, |
| 293 |
|
&atrunk, thescene.cuorg, thescene.cusize); |
| 294 |
< |
if (d > FTINY) |
| 294 |
> |
if (d > FTINY) { |
| 295 |
|
scalecolor(acol, 1.0/d); |
| 296 |
< |
else { |
| 297 |
< |
d = makeambient(acol, r, rdepth++); |
| 131 |
< |
rdepth--; |
| 296 |
> |
multcolor(aval, acol); |
| 297 |
> |
return; |
| 298 |
|
} |
| 299 |
< |
if (d > FTINY) |
| 299 |
> |
rdepth++; /* need to cache new value */ |
| 300 |
> |
d = makeambient(acol, r, aval, nrm, rdepth-1); |
| 301 |
> |
rdepth--; |
| 302 |
> |
if (d > FTINY) { |
| 303 |
> |
multcolor(aval, acol); /* got new value */ |
| 304 |
|
return; |
| 305 |
+ |
} |
| 306 |
|
dumbamb: /* return global value */ |
| 307 |
< |
copycolor(acol, ambval); |
| 307 |
> |
if ((ambvwt <= 0) | (navsum == 0)) { |
| 308 |
> |
multcolor(aval, ambval); |
| 309 |
> |
return; |
| 310 |
> |
} |
| 311 |
> |
l = bright(ambval); /* average in computations */ |
| 312 |
> |
if (l > FTINY) { |
| 313 |
> |
d = (log(l)*(double)ambvwt + avsum) / |
| 314 |
> |
(double)(ambvwt + navsum); |
| 315 |
> |
d = exp(d) / l; |
| 316 |
> |
scalecolor(aval, d); |
| 317 |
> |
multcolor(aval, ambval); /* apply color of ambval */ |
| 318 |
> |
} else { |
| 319 |
> |
d = exp( avsum / (double)navsum ); |
| 320 |
> |
scalecolor(aval, d); /* neutral color */ |
| 321 |
> |
} |
| 322 |
|
} |
| 323 |
|
|
| 324 |
|
|
| 325 |
< |
double |
| 326 |
< |
sumambient(acol, r, al, at, c0, s) /* get interpolated ambient value */ |
| 327 |
< |
COLOR acol; |
| 328 |
< |
register RAY *r; |
| 329 |
< |
int al; |
| 330 |
< |
AMBTREE *at; |
| 331 |
< |
FVECT c0; |
| 332 |
< |
double s; |
| 325 |
> |
extern double |
| 326 |
> |
sumambient( /* get interpolated ambient value */ |
| 327 |
> |
COLOR acol, |
| 328 |
> |
register RAY *r, |
| 329 |
> |
FVECT rn, |
| 330 |
> |
int al, |
| 331 |
> |
AMBTREE *at, |
| 332 |
> |
FVECT c0, |
| 333 |
> |
double s |
| 334 |
> |
) |
| 335 |
|
{ |
| 336 |
< |
extern double sqrt(); |
| 150 |
< |
double d, e1, e2, wt, wsum; |
| 336 |
> |
double d, e1, e2, wt, wsum; |
| 337 |
|
COLOR ct; |
| 338 |
|
FVECT ck0; |
| 339 |
|
int i; |
| 340 |
|
register int j; |
| 341 |
< |
register AMBVAL *av; |
| 342 |
< |
/* do this node */ |
| 341 |
> |
register AMBVAL *av; |
| 342 |
> |
|
| 343 |
|
wsum = 0.0; |
| 344 |
+ |
/* do this node */ |
| 345 |
|
for (av = at->alist; av != NULL; av = av->next) { |
| 346 |
+ |
double rn_dot = -2.0; |
| 347 |
+ |
if (tracktime) |
| 348 |
+ |
av->latick = ambclock; |
| 349 |
|
/* |
| 350 |
|
* Ambient level test. |
| 351 |
|
*/ |
| 352 |
< |
if (av->lvl > al || av->weight < r->rweight-FTINY) |
| 352 |
> |
if (av->lvl > al) /* list sorted, so this works */ |
| 353 |
> |
break; |
| 354 |
> |
if (av->weight < r->rweight-FTINY) |
| 355 |
|
continue; |
| 356 |
|
/* |
| 357 |
|
* Ambient radius test. |
| 358 |
|
*/ |
| 359 |
< |
e1 = 0.0; |
| 360 |
< |
for (j = 0; j < 3; j++) { |
| 361 |
< |
d = av->pos[j] - r->rop[j]; |
| 362 |
< |
e1 += d * d; |
| 363 |
< |
} |
| 359 |
> |
d = av->pos[0] - r->rop[0]; |
| 360 |
> |
e1 = d * d; |
| 361 |
> |
d = av->pos[1] - r->rop[1]; |
| 362 |
> |
e1 += d * d; |
| 363 |
> |
d = av->pos[2] - r->rop[2]; |
| 364 |
> |
e1 += d * d; |
| 365 |
|
e1 /= av->rad * av->rad; |
| 366 |
|
if (e1 > ambacc*ambacc*1.21) |
| 367 |
|
continue; |
| 368 |
|
/* |
| 369 |
< |
* Normal direction test. |
| 369 |
> |
* Direction test using closest normal. |
| 370 |
|
*/ |
| 371 |
< |
e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight; |
| 371 |
> |
d = DOT(av->dir, r->ron); |
| 372 |
> |
if (rn != r->ron) { |
| 373 |
> |
rn_dot = DOT(av->dir, rn); |
| 374 |
> |
if (rn_dot > 1.0-FTINY) |
| 375 |
> |
rn_dot = 1.0-FTINY; |
| 376 |
> |
if (rn_dot >= d-FTINY) { |
| 377 |
> |
d = rn_dot; |
| 378 |
> |
rn_dot = -2.0; |
| 379 |
> |
} |
| 380 |
> |
} |
| 381 |
> |
e2 = (1.0 - d) * r->rweight; |
| 382 |
|
if (e2 < 0.0) e2 = 0.0; |
| 383 |
|
if (e1 + e2 > ambacc*ambacc*1.21) |
| 384 |
|
continue; |
| 389 |
|
for (j = 0; j < 3; j++) |
| 390 |
|
d += (r->rop[j] - av->pos[j]) * |
| 391 |
|
(av->dir[j] + r->ron[j]); |
| 392 |
< |
if (d*0.5 < -minarad*ambacc) |
| 392 |
> |
if (d*0.5 < -minarad*ambacc-.001) |
| 393 |
|
continue; |
| 394 |
|
/* |
| 395 |
|
* Jittering final test reduces image artifacts. |
| 396 |
|
*/ |
| 397 |
< |
wt = sqrt(e1) + sqrt(e2); |
| 398 |
< |
wt *= .9 + .2*frandom(); |
| 399 |
< |
if (wt > ambacc) |
| 397 |
> |
e1 = sqrt(e1); |
| 398 |
> |
e2 = sqrt(e2); |
| 399 |
> |
wt = e1 + e2; |
| 400 |
> |
if (wt > ambacc*(.9+.2*urand(9015+samplendx))) |
| 401 |
|
continue; |
| 402 |
+ |
/* |
| 403 |
+ |
* Recompute directional error using perturbed normal |
| 404 |
+ |
*/ |
| 405 |
+ |
if (rn_dot > 0.0) { |
| 406 |
+ |
e2 = sqrt((1.0 - rn_dot)*r->rweight); |
| 407 |
+ |
wt = e1 + e2; |
| 408 |
+ |
} |
| 409 |
|
if (wt <= 1e-3) |
| 410 |
|
wt = 1e3; |
| 411 |
|
else |
| 412 |
|
wt = 1.0 / wt; |
| 413 |
|
wsum += wt; |
| 414 |
< |
extambient(ct, av, r->rop, r->ron); |
| 414 |
> |
extambient(ct, av, r->rop, rn); |
| 415 |
|
scalecolor(ct, wt); |
| 416 |
|
addcolor(acol, ct); |
| 417 |
|
} |
| 430 |
|
break; |
| 431 |
|
} |
| 432 |
|
if (j == 3) |
| 433 |
< |
wsum += sumambient(acol, r, al, at->kid+i, ck0, s); |
| 433 |
> |
wsum += sumambient(acol, r, rn, al, at->kid+i, ck0, s); |
| 434 |
|
} |
| 435 |
|
return(wsum); |
| 436 |
|
} |
| 437 |
|
|
| 438 |
|
|
| 439 |
< |
double |
| 440 |
< |
makeambient(acol, r, al) /* make a new ambient value */ |
| 441 |
< |
COLOR acol; |
| 442 |
< |
register RAY *r; |
| 443 |
< |
int al; |
| 439 |
> |
extern double |
| 440 |
> |
makeambient( /* make a new ambient value */ |
| 441 |
> |
COLOR acol, |
| 442 |
> |
RAY *r, |
| 443 |
> |
COLOR ac, |
| 444 |
> |
FVECT rn, |
| 445 |
> |
int al |
| 446 |
> |
) |
| 447 |
|
{ |
| 448 |
< |
AMBVAL amb; |
| 448 |
> |
AMBVAL amb; |
| 449 |
> |
double coef; |
| 450 |
|
FVECT gp, gd; |
| 451 |
|
/* compute weight */ |
| 452 |
|
amb.weight = pow(AVGREFL, (double)al); |
| 453 |
< |
if (r->rweight < 0.1*amb.weight) /* heuristic */ |
| 454 |
< |
amb.weight = r->rweight; |
| 453 |
> |
coef = intens(ac)*r->rweight; |
| 454 |
> |
if (coef < 0.1*amb.weight) /* heuristic */ |
| 455 |
> |
amb.weight = coef; |
| 456 |
|
/* compute ambient */ |
| 457 |
< |
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
| 458 |
< |
if (amb.rad == 0.0) |
| 457 |
> |
amb.rad = doambient(acol, r, ac, amb.weight, gp, gd); |
| 458 |
> |
if (amb.rad <= FTINY) |
| 459 |
|
return(0.0); |
| 460 |
|
/* store it */ |
| 461 |
|
VCOPY(amb.pos, r->rop); |
| 465 |
|
VCOPY(amb.gpos, gp); |
| 466 |
|
VCOPY(amb.gdir, gd); |
| 467 |
|
/* insert into tree */ |
| 468 |
< |
avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize); |
| 469 |
< |
avsave(&amb); /* write to file */ |
| 468 |
> |
avsave(&amb); /* and save to file */ |
| 469 |
> |
if (rn != r->ron) |
| 470 |
> |
extambient(acol, &amb, r->rop, rn); /* texture */ |
| 471 |
|
return(amb.rad); |
| 472 |
|
} |
| 473 |
|
|
| 474 |
|
|
| 475 |
< |
extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
| 476 |
< |
COLOR cr; |
| 477 |
< |
register AMBVAL *ap; |
| 478 |
< |
FVECT pv, nv; |
| 475 |
> |
extern void |
| 476 |
> |
extambient( /* extrapolate value at pv, nv */ |
| 477 |
> |
COLOR cr, |
| 478 |
> |
register AMBVAL *ap, |
| 479 |
> |
FVECT pv, |
| 480 |
> |
FVECT nv |
| 481 |
> |
) |
| 482 |
|
{ |
| 483 |
< |
FVECT v1, v2; |
| 483 |
> |
FVECT v1; |
| 484 |
|
register int i; |
| 485 |
< |
double d; |
| 485 |
> |
double d; |
| 486 |
|
|
| 487 |
|
d = 1.0; /* zeroeth order */ |
| 488 |
|
/* gradient due to translation */ |
| 489 |
|
for (i = 0; i < 3; i++) |
| 490 |
|
d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
| 491 |
|
/* gradient due to rotation */ |
| 492 |
< |
VCOPY(v1, ap->dir); |
| 493 |
< |
fcross(v2, v1, nv); |
| 274 |
< |
d += DOT(ap->gdir, v2); |
| 492 |
> |
VCROSS(v1, ap->dir, nv); |
| 493 |
> |
d += DOT(ap->gdir, v1); |
| 494 |
|
if (d <= 0.0) { |
| 495 |
|
setcolor(cr, 0.0, 0.0, 0.0); |
| 496 |
|
return; |
| 500 |
|
} |
| 501 |
|
|
| 502 |
|
|
| 503 |
< |
static |
| 504 |
< |
avsave(av) /* save an ambient value */ |
| 505 |
< |
AMBVAL *av; |
| 503 |
> |
static void |
| 504 |
> |
initambfile( /* initialize ambient file */ |
| 505 |
> |
int creat |
| 506 |
> |
) |
| 507 |
|
{ |
| 508 |
< |
#ifdef AMBFLUSH |
| 509 |
< |
static int nunflshed = 0; |
| 508 |
> |
extern char *progname, *octname; |
| 509 |
> |
static char *mybuf = NULL; |
| 510 |
> |
|
| 511 |
> |
#ifdef F_SETLKW |
| 512 |
> |
aflock(creat ? F_WRLCK : F_RDLCK); |
| 513 |
|
#endif |
| 514 |
+ |
SET_FILE_BINARY(ambfp); |
| 515 |
+ |
if (mybuf == NULL) |
| 516 |
+ |
mybuf = (char *)bmalloc(BUFSIZ+8); |
| 517 |
+ |
setbuf(ambfp, mybuf); |
| 518 |
+ |
if (creat) { /* new file */ |
| 519 |
+ |
newheader("RADIANCE", ambfp); |
| 520 |
+ |
fprintf(ambfp, "%s -av %g %g %g -aw %d -ab %d -aa %g ", |
| 521 |
+ |
progname, colval(ambval,RED), |
| 522 |
+ |
colval(ambval,GRN), colval(ambval,BLU), |
| 523 |
+ |
ambvwt, ambounce, ambacc); |
| 524 |
+ |
fprintf(ambfp, "-ad %d -as %d -ar %d ", |
| 525 |
+ |
ambdiv, ambssamp, ambres); |
| 526 |
+ |
if (octname != NULL) |
| 527 |
+ |
printargs(1, &octname, ambfp); |
| 528 |
+ |
else |
| 529 |
+ |
fputc('\n', ambfp); |
| 530 |
+ |
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
| 531 |
+ |
fputnow(ambfp); |
| 532 |
+ |
fputformat(AMBFMT, ambfp); |
| 533 |
+ |
putc('\n', ambfp); |
| 534 |
+ |
putambmagic(ambfp); |
| 535 |
+ |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
| 536 |
+ |
error(USER, "bad ambient file"); |
| 537 |
+ |
} |
| 538 |
+ |
|
| 539 |
+ |
|
| 540 |
+ |
static void |
| 541 |
+ |
avsave( /* insert and save an ambient value */ |
| 542 |
+ |
AMBVAL *av |
| 543 |
+ |
) |
| 544 |
+ |
{ |
| 545 |
+ |
avinsert(avstore(av)); |
| 546 |
|
if (ambfp == NULL) |
| 547 |
|
return; |
| 548 |
< |
if (fwrite((char *)av, sizeof(AMBVAL), 1, ambfp) != 1) |
| 548 |
> |
if (writambval(av, ambfp) < 0) |
| 549 |
|
goto writerr; |
| 550 |
< |
#ifdef AMBFLUSH |
| 551 |
< |
if (++nunflshed >= AMBFLUSH) { |
| 297 |
< |
if (fflush(ambfp) == EOF) |
| 550 |
> |
if (++nunflshed >= AMBFLUSH) |
| 551 |
> |
if (ambsync() == EOF) |
| 552 |
|
goto writerr; |
| 299 |
– |
nunflshed = 0; |
| 300 |
– |
} |
| 301 |
– |
#endif |
| 553 |
|
return; |
| 554 |
|
writerr: |
| 555 |
< |
error(SYSTEM, "error writing ambient file"); |
| 555 |
> |
error(SYSTEM, "error writing to ambient file"); |
| 556 |
|
} |
| 557 |
|
|
| 558 |
|
|
| 559 |
< |
static |
| 560 |
< |
avinsert(aval, at, c0, s) /* insert ambient value in a tree */ |
| 561 |
< |
AMBVAL *aval; |
| 562 |
< |
register AMBTREE *at; |
| 312 |
< |
FVECT c0; |
| 313 |
< |
double s; |
| 559 |
> |
static AMBVAL * |
| 560 |
> |
avstore( /* allocate memory and store aval */ |
| 561 |
> |
register AMBVAL *aval |
| 562 |
> |
) |
| 563 |
|
{ |
| 564 |
+ |
register AMBVAL *av; |
| 565 |
+ |
double d; |
| 566 |
+ |
|
| 567 |
+ |
if ((av = newambval()) == NULL) |
| 568 |
+ |
error(SYSTEM, "out of memory in avstore"); |
| 569 |
+ |
*av = *aval; |
| 570 |
+ |
av->latick = ambclock; |
| 571 |
+ |
av->next = NULL; |
| 572 |
+ |
nambvals++; |
| 573 |
+ |
d = bright(av->val); |
| 574 |
+ |
if (d > FTINY) { /* add to log sum for averaging */ |
| 575 |
+ |
avsum += log(d); |
| 576 |
+ |
navsum++; |
| 577 |
+ |
} |
| 578 |
+ |
return(av); |
| 579 |
+ |
} |
| 580 |
+ |
|
| 581 |
+ |
|
| 582 |
+ |
#define ATALLOCSZ 512 /* #/8 trees to allocate at once */ |
| 583 |
+ |
|
| 584 |
+ |
static AMBTREE *atfreelist = NULL; /* free ambient tree structures */ |
| 585 |
+ |
|
| 586 |
+ |
|
| 587 |
+ |
static AMBTREE * |
| 588 |
+ |
newambtree(void) /* allocate 8 ambient tree structs */ |
| 589 |
+ |
{ |
| 590 |
+ |
register AMBTREE *atp, *upperlim; |
| 591 |
+ |
|
| 592 |
+ |
if (atfreelist == NULL) { /* get more nodes */ |
| 593 |
+ |
atfreelist = (AMBTREE *)malloc(ATALLOCSZ*8*sizeof(AMBTREE)); |
| 594 |
+ |
if (atfreelist == NULL) |
| 595 |
+ |
return(NULL); |
| 596 |
+ |
/* link new free list */ |
| 597 |
+ |
upperlim = atfreelist + 8*(ATALLOCSZ-1); |
| 598 |
+ |
for (atp = atfreelist; atp < upperlim; atp += 8) |
| 599 |
+ |
atp->kid = atp + 8; |
| 600 |
+ |
atp->kid = NULL; |
| 601 |
+ |
} |
| 602 |
+ |
atp = atfreelist; |
| 603 |
+ |
atfreelist = atp->kid; |
| 604 |
+ |
memset((char *)atp, '\0', 8*sizeof(AMBTREE)); |
| 605 |
+ |
return(atp); |
| 606 |
+ |
} |
| 607 |
+ |
|
| 608 |
+ |
|
| 609 |
+ |
static void |
| 610 |
+ |
freeambtree( /* free 8 ambient tree structs */ |
| 611 |
+ |
AMBTREE *atp |
| 612 |
+ |
) |
| 613 |
+ |
{ |
| 614 |
+ |
atp->kid = atfreelist; |
| 615 |
+ |
atfreelist = atp; |
| 616 |
+ |
} |
| 617 |
+ |
|
| 618 |
+ |
|
| 619 |
+ |
static void |
| 620 |
+ |
avinsert( /* insert ambient value in our tree */ |
| 621 |
+ |
void *av |
| 622 |
+ |
) |
| 623 |
+ |
{ |
| 624 |
+ |
register AMBTREE *at; |
| 625 |
+ |
register AMBVAL *ap; |
| 626 |
+ |
AMBVAL avh; |
| 627 |
|
FVECT ck0; |
| 628 |
+ |
double s; |
| 629 |
|
int branch; |
| 317 |
– |
register AMBVAL *av; |
| 630 |
|
register int i; |
| 631 |
|
|
| 632 |
< |
if ((av = newambval()) == NULL) |
| 633 |
< |
goto memerr; |
| 634 |
< |
copystruct(av, aval); |
| 635 |
< |
VCOPY(ck0, c0); |
| 636 |
< |
while (s*(OCTSCALE/2) > av->rad*ambacc) { |
| 632 |
> |
if (((AMBVAL*)av)->rad <= FTINY) |
| 633 |
> |
error(CONSISTENCY, "zero ambient radius in avinsert"); |
| 634 |
> |
at = &atrunk; |
| 635 |
> |
VCOPY(ck0, thescene.cuorg); |
| 636 |
> |
s = thescene.cusize; |
| 637 |
> |
while (s*(OCTSCALE/2) > ((AMBVAL*)av)->rad*ambacc) { |
| 638 |
|
if (at->kid == NULL) |
| 639 |
|
if ((at->kid = newambtree()) == NULL) |
| 640 |
< |
goto memerr; |
| 640 |
> |
error(SYSTEM, "out of memory in avinsert"); |
| 641 |
|
s *= 0.5; |
| 642 |
|
branch = 0; |
| 643 |
|
for (i = 0; i < 3; i++) |
| 644 |
< |
if (av->pos[i] > ck0[i] + s) { |
| 644 |
> |
if (((AMBVAL*)av)->pos[i] > ck0[i] + s) { |
| 645 |
|
ck0[i] += s; |
| 646 |
|
branch |= 1 << i; |
| 647 |
|
} |
| 648 |
|
at = at->kid + branch; |
| 649 |
|
} |
| 650 |
< |
av->next = at->alist; |
| 651 |
< |
at->alist = av; |
| 652 |
< |
return; |
| 653 |
< |
memerr: |
| 654 |
< |
error(SYSTEM, "out of memory in avinsert"); |
| 650 |
> |
avh.next = at->alist; /* order by increasing level */ |
| 651 |
> |
for (ap = &avh; ap->next != NULL; ap = ap->next) |
| 652 |
> |
if (ap->next->lvl >= ((AMBVAL*)av)->lvl) |
| 653 |
> |
break; |
| 654 |
> |
((AMBVAL*)av)->next = ap->next; |
| 655 |
> |
ap->next = (AMBVAL*)av; |
| 656 |
> |
at->alist = avh.next; |
| 657 |
|
} |
| 658 |
+ |
|
| 659 |
+ |
|
| 660 |
+ |
static void |
| 661 |
+ |
unloadatree( /* unload an ambient value tree */ |
| 662 |
+ |
register AMBTREE *at, |
| 663 |
+ |
unloadtf_t *f |
| 664 |
+ |
) |
| 665 |
+ |
{ |
| 666 |
+ |
register AMBVAL *av; |
| 667 |
+ |
register int i; |
| 668 |
+ |
/* transfer values at this node */ |
| 669 |
+ |
for (av = at->alist; av != NULL; av = at->alist) { |
| 670 |
+ |
at->alist = av->next; |
| 671 |
+ |
(*f)(av); |
| 672 |
+ |
} |
| 673 |
+ |
if (at->kid == NULL) |
| 674 |
+ |
return; |
| 675 |
+ |
for (i = 0; i < 8; i++) /* transfer and free children */ |
| 676 |
+ |
unloadatree(at->kid+i, f); |
| 677 |
+ |
freeambtree(at->kid); |
| 678 |
+ |
at->kid = NULL; |
| 679 |
+ |
} |
| 680 |
+ |
|
| 681 |
+ |
|
| 682 |
+ |
static struct avl { |
| 683 |
+ |
AMBVAL *p; |
| 684 |
+ |
unsigned long t; |
| 685 |
+ |
} *avlist1; /* ambient value list with ticks */ |
| 686 |
+ |
static AMBVAL **avlist2; /* memory positions for sorting */ |
| 687 |
+ |
static int i_avlist; /* index for lists */ |
| 688 |
+ |
|
| 689 |
+ |
static int alatcmp(const void *av1, const void *av2); |
| 690 |
+ |
|
| 691 |
+ |
static void |
| 692 |
+ |
av2list( |
| 693 |
+ |
void *av |
| 694 |
+ |
) |
| 695 |
+ |
{ |
| 696 |
+ |
#ifdef DEBUG |
| 697 |
+ |
if (i_avlist >= nambvals) |
| 698 |
+ |
error(CONSISTENCY, "too many ambient values in av2list1"); |
| 699 |
+ |
#endif |
| 700 |
+ |
avlist1[i_avlist].p = avlist2[i_avlist] = (AMBVAL*)av; |
| 701 |
+ |
avlist1[i_avlist++].t = ((AMBVAL*)av)->latick; |
| 702 |
+ |
} |
| 703 |
+ |
|
| 704 |
+ |
|
| 705 |
+ |
static int |
| 706 |
+ |
alatcmp( /* compare ambient values for MRA */ |
| 707 |
+ |
const void *av1, |
| 708 |
+ |
const void *av2 |
| 709 |
+ |
) |
| 710 |
+ |
{ |
| 711 |
+ |
register long lc = ((struct avl *)av2)->t - ((struct avl *)av1)->t; |
| 712 |
+ |
return(lc<0 ? -1 : lc>0 ? 1 : 0); |
| 713 |
+ |
} |
| 714 |
+ |
|
| 715 |
+ |
|
| 716 |
+ |
/* GW NOTE 2002/10/3: |
| 717 |
+ |
* I used to compare AMBVAL pointers, but found that this was the |
| 718 |
+ |
* cause of a serious consistency error with gcc, since the optimizer |
| 719 |
+ |
* uses some dangerous trick in pointer subtraction that |
| 720 |
+ |
* assumes pointers differ by exact struct size increments. |
| 721 |
+ |
*/ |
| 722 |
+ |
static int |
| 723 |
+ |
aposcmp( /* compare ambient value positions */ |
| 724 |
+ |
const void *avp1, |
| 725 |
+ |
const void *avp2 |
| 726 |
+ |
) |
| 727 |
+ |
{ |
| 728 |
+ |
register long diff = *(char * const *)avp1 - *(char * const *)avp2; |
| 729 |
+ |
if (diff < 0) |
| 730 |
+ |
return(-1); |
| 731 |
+ |
return(diff > 0); |
| 732 |
+ |
} |
| 733 |
+ |
|
| 734 |
+ |
#if 1 |
| 735 |
+ |
static int |
| 736 |
+ |
avlmemi( /* find list position from address */ |
| 737 |
+ |
AMBVAL *avaddr |
| 738 |
+ |
) |
| 739 |
+ |
{ |
| 740 |
+ |
register AMBVAL **avlpp; |
| 741 |
+ |
|
| 742 |
+ |
avlpp = (AMBVAL **)bsearch((char *)&avaddr, (char *)avlist2, |
| 743 |
+ |
nambvals, sizeof(AMBVAL *), aposcmp); |
| 744 |
+ |
if (avlpp == NULL) |
| 745 |
+ |
error(CONSISTENCY, "address not found in avlmemi"); |
| 746 |
+ |
return(avlpp - avlist2); |
| 747 |
+ |
} |
| 748 |
+ |
#else |
| 749 |
+ |
#define avlmemi(avaddr) ((AMBVAL **)bsearch((char *)&avaddr,(char *)avlist2, \ |
| 750 |
+ |
nambvals,sizeof(AMBVAL *),aposcmp) - avlist2) |
| 751 |
+ |
#endif |
| 752 |
+ |
|
| 753 |
+ |
|
| 754 |
+ |
static void |
| 755 |
+ |
sortambvals( /* resort ambient values */ |
| 756 |
+ |
int always |
| 757 |
+ |
) |
| 758 |
+ |
{ |
| 759 |
+ |
AMBTREE oldatrunk; |
| 760 |
+ |
AMBVAL tav, *tap, *pnext; |
| 761 |
+ |
register int i, j; |
| 762 |
+ |
/* see if it's time yet */ |
| 763 |
+ |
if (!always && (ambclock++ < lastsort+sortintvl || |
| 764 |
+ |
nambvals < SORT_THRESH)) |
| 765 |
+ |
return; |
| 766 |
+ |
/* |
| 767 |
+ |
* The idea here is to minimize memory thrashing |
| 768 |
+ |
* in VM systems by improving reference locality. |
| 769 |
+ |
* We do this by periodically sorting our stored ambient |
| 770 |
+ |
* values in memory in order of most recently to least |
| 771 |
+ |
* recently accessed. This ordering was chosen so that new |
| 772 |
+ |
* ambient values (which tend to be less important) go into |
| 773 |
+ |
* higher memory with the infrequently accessed values. |
| 774 |
+ |
* Since we expect our values to need sorting less |
| 775 |
+ |
* frequently as the process continues, we double our |
| 776 |
+ |
* waiting interval after each call. |
| 777 |
+ |
* This routine is also called by setambacc() with |
| 778 |
+ |
* the "always" parameter set to 1 so that the ambient |
| 779 |
+ |
* tree will be rebuilt with the new accuracy parameter. |
| 780 |
+ |
*/ |
| 781 |
+ |
if (tracktime) { /* allocate pointer arrays to sort */ |
| 782 |
+ |
avlist2 = (AMBVAL **)malloc(nambvals*sizeof(AMBVAL *)); |
| 783 |
+ |
avlist1 = (struct avl *)malloc(nambvals*sizeof(struct avl)); |
| 784 |
+ |
} else { |
| 785 |
+ |
avlist2 = NULL; |
| 786 |
+ |
avlist1 = NULL; |
| 787 |
+ |
} |
| 788 |
+ |
if (avlist1 == NULL) { /* no time tracking -- rebuild tree? */ |
| 789 |
+ |
if (avlist2 != NULL) |
| 790 |
+ |
free((void *)avlist2); |
| 791 |
+ |
if (always) { /* rebuild without sorting */ |
| 792 |
+ |
oldatrunk = atrunk; |
| 793 |
+ |
atrunk.alist = NULL; |
| 794 |
+ |
atrunk.kid = NULL; |
| 795 |
+ |
unloadatree(&oldatrunk, avinsert); |
| 796 |
+ |
} |
| 797 |
+ |
} else { /* sort memory by last access time */ |
| 798 |
+ |
/* |
| 799 |
+ |
* Sorting memory is tricky because it isn't contiguous. |
| 800 |
+ |
* We have to sort an array of pointers by MRA and also |
| 801 |
+ |
* by memory position. We then copy values in "loops" |
| 802 |
+ |
* to minimize memory hits. Nevertheless, we will visit |
| 803 |
+ |
* everyone at least twice, and this is an expensive process |
| 804 |
+ |
* when we're thrashing, which is when we need to do it. |
| 805 |
+ |
*/ |
| 806 |
+ |
#ifdef DEBUG |
| 807 |
+ |
sprintf(errmsg, "sorting %u ambient values at ambclock=%lu...", |
| 808 |
+ |
nambvals, ambclock); |
| 809 |
+ |
eputs(errmsg); |
| 810 |
+ |
#endif |
| 811 |
+ |
i_avlist = 0; |
| 812 |
+ |
unloadatree(&atrunk, av2list); /* empty current tree */ |
| 813 |
+ |
#ifdef DEBUG |
| 814 |
+ |
if (i_avlist < nambvals) |
| 815 |
+ |
error(CONSISTENCY, "missing ambient values in sortambvals"); |
| 816 |
+ |
#endif |
| 817 |
+ |
qsort((char *)avlist1, nambvals, sizeof(struct avl), alatcmp); |
| 818 |
+ |
qsort((char *)avlist2, nambvals, sizeof(AMBVAL *), aposcmp); |
| 819 |
+ |
for (i = 0; i < nambvals; i++) { |
| 820 |
+ |
if (avlist1[i].p == NULL) |
| 821 |
+ |
continue; |
| 822 |
+ |
tap = avlist2[i]; |
| 823 |
+ |
tav = *tap; |
| 824 |
+ |
for (j = i; (pnext = avlist1[j].p) != tap; |
| 825 |
+ |
j = avlmemi(pnext)) { |
| 826 |
+ |
*(avlist2[j]) = *pnext; |
| 827 |
+ |
avinsert(avlist2[j]); |
| 828 |
+ |
avlist1[j].p = NULL; |
| 829 |
+ |
} |
| 830 |
+ |
*(avlist2[j]) = tav; |
| 831 |
+ |
avinsert(avlist2[j]); |
| 832 |
+ |
avlist1[j].p = NULL; |
| 833 |
+ |
} |
| 834 |
+ |
free((void *)avlist1); |
| 835 |
+ |
free((void *)avlist2); |
| 836 |
+ |
/* compute new sort interval */ |
| 837 |
+ |
sortintvl = ambclock - lastsort; |
| 838 |
+ |
if (sortintvl >= MAX_SORT_INTVL/2) |
| 839 |
+ |
sortintvl = MAX_SORT_INTVL; |
| 840 |
+ |
else |
| 841 |
+ |
sortintvl <<= 1; /* wait twice as long next */ |
| 842 |
+ |
#ifdef DEBUG |
| 843 |
+ |
eputs("done\n"); |
| 844 |
+ |
#endif |
| 845 |
+ |
} |
| 846 |
+ |
if (ambclock >= MAXACLOCK) |
| 847 |
+ |
ambclock = MAXACLOCK/2; |
| 848 |
+ |
lastsort = ambclock; |
| 849 |
+ |
} |
| 850 |
+ |
|
| 851 |
+ |
|
| 852 |
+ |
#ifdef F_SETLKW |
| 853 |
+ |
|
| 854 |
+ |
static void |
| 855 |
+ |
aflock( /* lock/unlock ambient file */ |
| 856 |
+ |
int typ |
| 857 |
+ |
) |
| 858 |
+ |
{ |
| 859 |
+ |
static struct flock fls; /* static so initialized to zeroes */ |
| 860 |
+ |
|
| 861 |
+ |
fls.l_type = typ; |
| 862 |
+ |
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
| 863 |
+ |
error(SYSTEM, "cannot (un)lock ambient file"); |
| 864 |
+ |
} |
| 865 |
+ |
|
| 866 |
+ |
|
| 867 |
+ |
extern int |
| 868 |
+ |
ambsync(void) /* synchronize ambient file */ |
| 869 |
+ |
{ |
| 870 |
+ |
long flen; |
| 871 |
+ |
AMBVAL avs; |
| 872 |
+ |
register int n; |
| 873 |
+ |
|
| 874 |
+ |
if (nunflshed == 0) |
| 875 |
+ |
return(0); |
| 876 |
+ |
if (lastpos < 0) /* initializing (locked in initambfile) */ |
| 877 |
+ |
goto syncend; |
| 878 |
+ |
/* gain exclusive access */ |
| 879 |
+ |
aflock(F_WRLCK); |
| 880 |
+ |
/* see if file has grown */ |
| 881 |
+ |
if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0) |
| 882 |
+ |
goto seekerr; |
| 883 |
+ |
if ( (n = flen - lastpos) ) { /* file has grown */ |
| 884 |
+ |
if (ambinp == NULL) { /* use duplicate filedes */ |
| 885 |
+ |
ambinp = fdopen(dup(fileno(ambfp)), "r"); |
| 886 |
+ |
if (ambinp == NULL) |
| 887 |
+ |
error(SYSTEM, "fdopen failed in ambsync"); |
| 888 |
+ |
} |
| 889 |
+ |
if (fseek(ambinp, lastpos, 0) < 0) |
| 890 |
+ |
goto seekerr; |
| 891 |
+ |
while (n >= AMBVALSIZ) { /* load contributed values */ |
| 892 |
+ |
if (!readambval(&avs, ambinp)) { |
| 893 |
+ |
sprintf(errmsg, |
| 894 |
+ |
"ambient file \"%s\" corrupted near character %ld", |
| 895 |
+ |
ambfile, flen - n); |
| 896 |
+ |
error(WARNING, errmsg); |
| 897 |
+ |
break; |
| 898 |
+ |
} |
| 899 |
+ |
avinsert(avstore(&avs)); |
| 900 |
+ |
n -= AMBVALSIZ; |
| 901 |
+ |
} |
| 902 |
+ |
/*** seek always as safety measure |
| 903 |
+ |
if (n) ***/ /* alignment */ |
| 904 |
+ |
if (lseek(fileno(ambfp), (off_t)(flen-n), SEEK_SET) < 0) |
| 905 |
+ |
goto seekerr; |
| 906 |
+ |
} |
| 907 |
+ |
#ifdef DEBUG |
| 908 |
+ |
if (ambfp->_ptr - ambfp->_base != nunflshed*AMBVALSIZ) { |
| 909 |
+ |
sprintf(errmsg, "ambient file buffer at %d rather than %d", |
| 910 |
+ |
ambfp->_ptr - ambfp->_base, |
| 911 |
+ |
nunflshed*AMBVALSIZ); |
| 912 |
+ |
error(CONSISTENCY, errmsg); |
| 913 |
+ |
} |
| 914 |
+ |
#endif |
| 915 |
+ |
syncend: |
| 916 |
+ |
n = fflush(ambfp); /* calls write() at last */ |
| 917 |
+ |
if ((lastpos = lseek(fileno(ambfp), (off_t)0, SEEK_CUR)) < 0) |
| 918 |
+ |
goto seekerr; |
| 919 |
+ |
aflock(F_UNLCK); /* release file */ |
| 920 |
+ |
nunflshed = 0; |
| 921 |
+ |
return(n); |
| 922 |
+ |
seekerr: |
| 923 |
+ |
error(SYSTEM, "seek failed in ambsync"); |
| 924 |
+ |
return -1; /* pro forma return */ |
| 925 |
+ |
} |
| 926 |
+ |
|
| 927 |
+ |
#else |
| 928 |
+ |
|
| 929 |
+ |
extern int |
| 930 |
+ |
ambsync(void) /* flush ambient file */ |
| 931 |
+ |
{ |
| 932 |
+ |
if (nunflshed == 0) |
| 933 |
+ |
return(0); |
| 934 |
+ |
nunflshed = 0; |
| 935 |
+ |
return(fflush(ambfp)); |
| 936 |
+ |
} |
| 937 |
+ |
|
| 938 |
+ |
#endif |
