| 1 |
/* Copyright (c) 1991 Regents of the University of California */ |
| 2 |
|
| 3 |
#ifndef lint |
| 4 |
static char SCCSid[] = "$SunId$ LBL"; |
| 5 |
#endif |
| 6 |
|
| 7 |
/* |
| 8 |
* Compute pixels for glare calculation |
| 9 |
*/ |
| 10 |
|
| 11 |
#include "glare.h" |
| 12 |
#include <sys/param.h> |
| 13 |
/* compute rtrace buffer size */ |
| 14 |
#ifndef PIPE_BUF |
| 15 |
#define PIPE_BUF 512 /* hyperconservative */ |
| 16 |
#endif |
| 17 |
#define MAXPIX (PIPE_BUF/(6*sizeof(float)) - 1) |
| 18 |
|
| 19 |
#ifndef BSD |
| 20 |
#define vfork fork |
| 21 |
#endif |
| 22 |
|
| 23 |
#define MAXSBUF 524268 /* maximum total size of scanline buffer */ |
| 24 |
#define HSIZE 317 /* size of scanline hash table */ |
| 25 |
#define NRETIRE 16 /* number of scanlines to retire at once */ |
| 26 |
|
| 27 |
int rt_pid = -1; /* process id for rtrace */ |
| 28 |
int fd_tort, fd_fromrt; /* pipe descriptors */ |
| 29 |
|
| 30 |
FILE *pictfp = NULL; /* picture file pointer */ |
| 31 |
double exposure; /* picture exposure */ |
| 32 |
int pxsiz, pysiz; /* picture dimensions */ |
| 33 |
|
| 34 |
static int curpos; /* current scanline */ |
| 35 |
static long *scanpos; /* scanline positions */ |
| 36 |
|
| 37 |
typedef struct scan { |
| 38 |
int y; /* scanline position */ |
| 39 |
long lused; /* for LRU replacement */ |
| 40 |
struct scan *next; /* next in this hash or free list */ |
| 41 |
/* followed by the scanline data */ |
| 42 |
} SCAN; /* buffered scanline */ |
| 43 |
|
| 44 |
#define scandata(sl) ((COLR *)((sl)+1)) |
| 45 |
#define shash(y) ((y)%HSIZE) |
| 46 |
|
| 47 |
static SCAN *freelist; /* scanline free list */ |
| 48 |
static SCAN *hashtab[HSIZE]; /* scanline hash table */ |
| 49 |
|
| 50 |
static long ncall = 0L; /* number of calls to getpictscan */ |
| 51 |
static long nread = 0L; /* number of scanlines read */ |
| 52 |
|
| 53 |
SCAN *scanretire(); |
| 54 |
|
| 55 |
extern long ftell(); |
| 56 |
|
| 57 |
|
| 58 |
SCAN * |
| 59 |
claimscan(y) /* claim scanline from buffers */ |
| 60 |
int y; |
| 61 |
{ |
| 62 |
int hi = shash(y); |
| 63 |
SCAN *slast; |
| 64 |
register SCAN *sl; |
| 65 |
|
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for (sl = hashtab[hi]; sl != NULL; sl = sl->next) |
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if (sl->y == y) /* active scanline */ |
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return(sl); |
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for (slast = NULL, sl = freelist; sl != NULL; slast = sl, sl = sl->next) |
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if (sl->y == -1 || sl->y == y || sl->next == NULL) { |
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if (slast == NULL) /* remove from free */ |
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freelist = sl->next; |
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else |
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slast->next = sl->next; |
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if (sl->y == y) { /* reclaim */ |
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sl->next = hashtab[hi]; |
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hashtab[hi] = sl; |
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#ifdef DEBUG |
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if (verbose) |
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fprintf(stderr, |
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"%s: scanline %d reclaimed\n", |
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progname, y); |
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#endif |
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} |
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return(sl); |
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} |
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return(scanretire()); /* need more free scanlines */ |
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} |
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|
| 90 |
|
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COLR * |
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getpictscan(y) /* get picture scanline */ |
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int y; |
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{ |
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register SCAN *sl; |
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register int i; |
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/* first check our buffers */ |
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sl = claimscan(y); |
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if (sl == NULL) |
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memerr("claimscan()"); |
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sl->lused = ncall++; |
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if (sl->y == y) /* scan hit */ |
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return(scandata(sl)); |
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/* else read in replacement */ |
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if (scanpos[y] < 0) { /* need to search */ |
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for (i = y+1; i < curpos; i++) |
| 107 |
if (scanpos[i] >= 0) { |
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if (fseek(pictfp, scanpos[i], 0) < 0) |
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goto seekerr; |
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curpos = i; |
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break; |
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} |
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while (curpos >= y) { |
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scanpos[curpos] = ftell(pictfp); |
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if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0) |
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goto readerr; |
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nread++; |
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curpos--; |
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} |
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} else { |
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if (curpos != y && fseek(pictfp, scanpos[y], 0) < 0) |
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goto seekerr; |
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if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0) |
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goto readerr; |
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nread++; |
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curpos = y-1; |
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} |
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sl->y = y; |
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i = shash(y); /* add to hash list */ |
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sl->next = hashtab[i]; |
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hashtab[i] = sl; |
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return(scandata(sl)); |
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readerr: |
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fprintf(stderr, "%s: picture read error\n", progname); |
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exit(1); |
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seekerr: |
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fprintf(stderr, "%s: picture seek error\n", progname); |
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exit(1); |
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} |
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|
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|
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#ifdef DEBUG |
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pict_stats() /* print out picture read statistics */ |
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{ |
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static long lastcall = 0L; /* ncall at last report */ |
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static long lastread = 0L; /* nread at last report */ |
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|
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if (ncall == lastcall) |
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return; |
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fprintf(stderr, "%s: %ld scanlines read in %ld calls\n", |
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progname, nread-lastread, ncall-lastcall); |
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lastcall = ncall; |
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lastread = nread; |
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} |
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#endif |
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|
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|
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double |
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pict_val(vd) /* find picture value for view direction */ |
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FVECT vd; |
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{ |
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FVECT pp; |
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double vpx, vpy, vpz; |
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COLOR res; |
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|
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if (pictfp == NULL) |
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return(-1.0); |
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pp[0] = pictview.vp[0] + vd[0]; |
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pp[1] = pictview.vp[1] + vd[1]; |
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pp[2] = pictview.vp[2] + vd[2]; |
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viewpixel(&vpx, &vpy, &vpz, &pictview, pp); |
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if (vpz <= FTINY || vpx < 0. || vpx >= 1. || vpy < 0. || vpy >= 1.) |
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return(-1.0); |
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colr_color(res, getpictscan((int)(vpy*pysiz))[(int)(vpx*pxsiz)]); |
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return(luminance(res)/exposure); |
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} |
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|
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|
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double |
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getviewpix(vh, vv) /* compute single view pixel */ |
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int vh, vv; |
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{ |
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FVECT dir; |
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float rt_buf[6]; |
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double res; |
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|
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if (compdir(dir, vh, vv) < 0) |
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return(-1.0); |
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npixinvw++; |
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if ((res = pict_val(dir)) >= 0.0) |
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return(res); |
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if (rt_pid == -1) { |
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npixmiss++; |
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return(-1.0); |
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} |
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rt_buf[0] = ourview.vp[0]; |
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rt_buf[1] = ourview.vp[1]; |
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rt_buf[2] = ourview.vp[2]; |
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rt_buf[3] = dir[0]; |
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rt_buf[4] = dir[1]; |
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rt_buf[5] = dir[2]; |
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rt_compute(rt_buf, 1); |
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return(luminance(rt_buf)); |
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} |
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|
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|
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getviewspan(vv, vb) /* compute a span of view pixels */ |
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int vv; |
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float *vb; |
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{ |
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float rt_buf[6*MAXPIX]; /* rtrace send/receive buffer */ |
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register int n; /* number of pixels in buffer */ |
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short buf_vh[MAXPIX]; /* pixel positions */ |
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FVECT dir; |
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register int vh; |
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|
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#ifdef DEBUG |
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if (verbose) |
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fprintf(stderr, "%s: computing view span at %d...\n", |
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progname, vv); |
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#endif |
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n = 0; |
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for (vh = -hsize; vh <= hsize; vh++) { |
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if (compdir(dir, vh, vv) < 0) { /* off viewable region */ |
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vb[vh+hsize] = -1.0; |
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continue; |
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} |
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npixinvw++; |
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if ((vb[vh+hsize] = pict_val(dir)) >= 0.0) |
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continue; |
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if (rt_pid == -1) { /* missing information */ |
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npixmiss++; |
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continue; |
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} |
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/* send to rtrace */ |
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if (n >= MAXPIX) { /* flush */ |
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rt_compute(rt_buf, n); |
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while (n-- > 0) |
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vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n); |
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} |
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rt_buf[6*n] = ourview.vp[0]; |
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rt_buf[6*n+1] = ourview.vp[1]; |
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rt_buf[6*n+2] = ourview.vp[2]; |
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rt_buf[6*n+3] = dir[0]; |
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rt_buf[6*n+4] = dir[1]; |
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rt_buf[6*n+5] = dir[2]; |
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buf_vh[n++] = vh; |
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} |
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#ifdef DEBUG |
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if (verbose) |
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pict_stats(); |
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#endif |
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if (n > 0) { /* process pending buffer */ |
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rt_compute(rt_buf, n); |
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while (n-- > 0) |
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vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n); |
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} |
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} |
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|
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|
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rt_compute(pb, np) /* process buffer through rtrace */ |
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float *pb; |
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int np; |
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{ |
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static float nbuf[6] = {0.,0.,0.,0.,0.,0.}; |
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|
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#ifdef DEBUG |
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if (verbose && np > 1) |
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fprintf(stderr, "%s: sending %d samples to rtrace...\n", |
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progname, np); |
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#endif |
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if (writebuf(fd_tort,(char *)pb,6*sizeof(float)*np) < 6*sizeof(float)*np |
| 273 |
|| writebuf(fd_tort,(char *)nbuf,sizeof(nbuf)) < sizeof(nbuf)) { |
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fprintf(stderr, "%s: error writing to rtrace process\n", |
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progname); |
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exit(1); |
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} |
| 278 |
if (readbuf(fd_fromrt, (char *)pb, 3*sizeof(float)*np) |
| 279 |
< 3*sizeof(float)*np) { |
| 280 |
fprintf(stderr, "%s: error reading from rtrace process\n", |
| 281 |
progname); |
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exit(1); |
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} |
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} |
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|
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|
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getexpos(s) /* get exposure from header line */ |
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char *s; |
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{ |
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if (isexpos(s)) |
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exposure *= exposval(s); |
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} |
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|
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|
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open_pict(fn) /* open picture file */ |
| 296 |
char *fn; |
| 297 |
{ |
| 298 |
register int i; |
| 299 |
|
| 300 |
if ((pictfp = fopen(fn, "r")) == NULL) { |
| 301 |
fprintf("%s: cannot open\n", fn); |
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exit(1); |
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} |
| 304 |
exposure = 1.0; |
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getheader(pictfp, getexpos); |
| 306 |
if (fgetresolu(&pxsiz, &pysiz, pictfp) != (YMAJOR|YDECR)) { |
| 307 |
fprintf("%s: bad picture resolution\n", fn); |
| 308 |
exit(1); |
| 309 |
} |
| 310 |
initscans(); |
| 311 |
} |
| 312 |
|
| 313 |
|
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close_pict() /* done with picture */ |
| 315 |
{ |
| 316 |
register int i; |
| 317 |
|
| 318 |
if (pictfp == NULL) |
| 319 |
return; |
| 320 |
fclose(pictfp); |
| 321 |
donescans(); |
| 322 |
pictfp = NULL; |
| 323 |
} |
| 324 |
|
| 325 |
|
| 326 |
fork_rtrace(av) /* open pipe and start rtrace */ |
| 327 |
char *av[]; |
| 328 |
{ |
| 329 |
int p0[2], p1[2]; |
| 330 |
|
| 331 |
if (pipe(p0) < 0 || pipe(p1) < 0) { |
| 332 |
perror(progname); |
| 333 |
exit(1); |
| 334 |
} |
| 335 |
if ((rt_pid = vfork()) == 0) { /* if child */ |
| 336 |
close(p0[1]); |
| 337 |
close(p1[0]); |
| 338 |
if (p0[0] != 0) { /* connect p0 to stdin */ |
| 339 |
dup2(p0[0], 0); |
| 340 |
close(p0[0]); |
| 341 |
} |
| 342 |
if (p1[1] != 0) { /* connect p1 to stdout */ |
| 343 |
dup2(p1[1], 1); |
| 344 |
close(p1[1]); |
| 345 |
} |
| 346 |
execvp(av[0], av); |
| 347 |
perror(av[0]); |
| 348 |
_exit(127); |
| 349 |
} |
| 350 |
if (rt_pid == -1) { |
| 351 |
perror(progname); |
| 352 |
exit(1); |
| 353 |
} |
| 354 |
close(p0[0]); |
| 355 |
close(p1[1]); |
| 356 |
fd_tort = p0[1]; |
| 357 |
fd_fromrt = p1[0]; |
| 358 |
} |
| 359 |
|
| 360 |
|
| 361 |
done_rtrace() /* wait for rtrace to finish */ |
| 362 |
{ |
| 363 |
int pid, status; |
| 364 |
|
| 365 |
if (rt_pid == -1) |
| 366 |
return; |
| 367 |
close(fd_tort); |
| 368 |
close(fd_fromrt); |
| 369 |
while ((pid = wait(&status)) != -1 && pid != rt_pid) |
| 370 |
; |
| 371 |
if (pid == rt_pid && status != 0) { |
| 372 |
fprintf(stderr, "%s: bad status (%d) from rtrace\n", |
| 373 |
progname, status); |
| 374 |
exit(1); |
| 375 |
} |
| 376 |
rt_pid = -1; |
| 377 |
} |
| 378 |
|
| 379 |
|
| 380 |
int |
| 381 |
readbuf(fd, bpos, siz) |
| 382 |
int fd; |
| 383 |
char *bpos; |
| 384 |
int siz; |
| 385 |
{ |
| 386 |
register int cc, nrem = siz; |
| 387 |
|
| 388 |
while (nrem > 0 && (cc = read(fd, bpos, nrem)) > 0) { |
| 389 |
bpos += cc; |
| 390 |
nrem -= cc; |
| 391 |
} |
| 392 |
if (cc < 0) |
| 393 |
return(cc); |
| 394 |
return(siz-nrem); |
| 395 |
} |
| 396 |
|
| 397 |
|
| 398 |
int |
| 399 |
writebuf(fd, bpos, siz) |
| 400 |
char *bpos; |
| 401 |
int siz; |
| 402 |
{ |
| 403 |
register int cc, nrem = siz; |
| 404 |
|
| 405 |
while (nrem > 0 && (cc = write(fd, bpos, nrem)) > 0) { |
| 406 |
bpos += cc; |
| 407 |
nrem -= cc; |
| 408 |
} |
| 409 |
if (cc < 0) |
| 410 |
return(cc); |
| 411 |
return(siz-nrem); |
| 412 |
} |
| 413 |
|
| 414 |
|
| 415 |
SCAN * |
| 416 |
scanretire() /* retire old scanlines to free list */ |
| 417 |
{ |
| 418 |
SCAN *sold[NRETIRE]; |
| 419 |
int n; |
| 420 |
int h; |
| 421 |
register SCAN *sl; |
| 422 |
register int i; |
| 423 |
/* grab the NRETIRE oldest scanlines */ |
| 424 |
sold[n = 0] = NULL; |
| 425 |
for (h = 0; h < HSIZE; h++) |
| 426 |
for (sl = hashtab[h]; sl != NULL; sl = sl->next) { |
| 427 |
for (i = n; i && sold[i-1]->lused > sl->lused; i--) |
| 428 |
if (i < NRETIRE) |
| 429 |
sold[i] = sold[i-1]; |
| 430 |
if (i < NRETIRE) { |
| 431 |
sold[i] = sl; |
| 432 |
if (n < NRETIRE) /* grow list */ |
| 433 |
n++; |
| 434 |
} |
| 435 |
} |
| 436 |
/* put scanlines into free list */ |
| 437 |
for (i = 0; i < n; i++) { |
| 438 |
h = shash(sold[i]->y); |
| 439 |
sl = hashtab[h]; |
| 440 |
if (sl == sold[i]) |
| 441 |
hashtab[h] = sl->next; |
| 442 |
else { |
| 443 |
while (sl->next != sold[i]) /* IS in list */ |
| 444 |
sl = sl->next; |
| 445 |
sl->next = sold[i]->next; |
| 446 |
} |
| 447 |
if (i > 0) { /* save oldest as return value */ |
| 448 |
sold[i]->next = freelist; |
| 449 |
freelist = sold[i]; |
| 450 |
} |
| 451 |
} |
| 452 |
return(sold[0]); |
| 453 |
} |
| 454 |
|
| 455 |
|
| 456 |
static char *scan_buf; |
| 457 |
|
| 458 |
|
| 459 |
initscans() /* initialize scanline buffers */ |
| 460 |
{ |
| 461 |
int scansize; |
| 462 |
register SCAN *ptr; |
| 463 |
register int i; |
| 464 |
/* initialize positions */ |
| 465 |
scanpos = (long *)malloc(pysiz*sizeof(long)); |
| 466 |
if (scanpos == NULL) |
| 467 |
memerr("scanline positions"); |
| 468 |
for (i = pysiz-1; i >= 0; i--) |
| 469 |
scanpos[i] = -1L; |
| 470 |
curpos = pysiz-1; |
| 471 |
/* clear hash table */ |
| 472 |
for (i = 0; i < HSIZE; i++) |
| 473 |
hashtab[i] = NULL; |
| 474 |
/* allocate scanline buffers */ |
| 475 |
scansize = sizeof(SCAN) + pxsiz*sizeof(COLR); |
| 476 |
#ifdef ALIGN |
| 477 |
scansize = scansize+(sizeof(ALIGN)-1)) & ~(sizeof(ALIGN)-1); |
| 478 |
#endif |
| 479 |
i = MAXSBUF / scansize; /* compute number to allocate */ |
| 480 |
if (i > HSIZE) |
| 481 |
i = HSIZE; |
| 482 |
scan_buf = malloc(i*scansize); /* get in one big chunk */ |
| 483 |
if (scan_buf == NULL) |
| 484 |
memerr("scanline buffers"); |
| 485 |
ptr = (SCAN *)scan_buf; |
| 486 |
freelist = NULL; /* build our free list */ |
| 487 |
while (i-- > 0) { |
| 488 |
ptr->y = -1; |
| 489 |
ptr->lused = -1; |
| 490 |
ptr->next = freelist; |
| 491 |
freelist = ptr; |
| 492 |
ptr = (SCAN *)((char *)ptr + scansize); /* beware of C bugs */ |
| 493 |
} |
| 494 |
} |
| 495 |
|
| 496 |
|
| 497 |
donescans() /* free up scanlines */ |
| 498 |
{ |
| 499 |
free(scan_buf); |
| 500 |
free((char *)scanpos); |
| 501 |
} |
