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/* Copyright (c) 1991 Regents of the University of California */
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| 2 |
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#ifndef lint
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| 4 |
static char SCCSid[] = "$SunId$ LBL";
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| 5 |
#endif
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| 6 |
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| 7 |
/*
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| 8 |
* Compute pixels for glare calculation
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| 9 |
*/
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| 11 |
#include "glare.h"
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#include <sys/param.h>
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/* compute rtrace buffer size */
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| 14 |
#ifndef PIPE_BUF
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| 15 |
#define PIPE_BUF 512 /* hyperconservative */
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#endif
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#define MAXPIX (PIPE_BUF/(6*sizeof(float)) - 1)
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#ifndef BSD
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#define vfork fork
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#endif
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#define MAXSBUF 524268 /* maximum total size of scanline buffer */
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#define HSIZE 317 /* size of scanline hash table */
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#define NRETIRE 16 /* number of scanlines to retire at once */
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int rt_pid = -1; /* process id for rtrace */
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int fd_tort, fd_fromrt; /* pipe descriptors */
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FILE *pictfp = NULL; /* picture file pointer */
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double exposure; /* picture exposure */
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int pxsiz, pysiz; /* picture dimensions */
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static int curpos; /* current scanline */
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static long *scanpos; /* scanline positions */
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typedef struct scan {
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int y; /* scanline position */
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long lused; /* for LRU replacement */
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struct scan *next; /* next in this hash or free list */
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/* followed by the scanline data */
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} SCAN; /* buffered scanline */
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#define scandata(sl) ((COLR *)((sl)+1))
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#define shash(y) ((y)%HSIZE)
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static SCAN *freelist; /* scanline free list */
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static SCAN *hashtab[HSIZE]; /* scanline hash table */
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| 50 |
static long ncall = 0L; /* number of calls to getpictscan */
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static long nread = 0L; /* number of scanlines read */
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static int wrongformat = 0;
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SCAN *scanretire();
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extern long ftell();
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SCAN *
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claimscan(y) /* claim scanline from buffers */
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int y;
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{
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int hi = shash(y);
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SCAN *slast;
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register SCAN *sl;
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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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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++)
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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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#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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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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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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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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double
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getviewpix(vh, vv, se) /* compute single view pixel */
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int vh, vv;
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SPANERR *se;
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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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if (compdir(dir, vh, vv, se) < 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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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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SPANERR sperr;
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FVECT dir;
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register int vh;
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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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setspanerr(&sperr, vv);
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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, &sperr) < 0) { /* not in view */
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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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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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#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
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|| 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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}
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if (readbuf(fd_fromrt, (char *)pb, 3*sizeof(float)*np)
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< 3*sizeof(float)*np) {
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fprintf(stderr, "%s: error reading from rtrace process\n",
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progname);
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exit(1);
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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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char fmt[32];
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if (isexpos(s))
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exposure *= exposval(s);
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else if (isformat(s)) {
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formatval(fmt, s);
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wrongformat = strcmp(fmt, COLRFMT);
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}
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}
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open_pict(fn) /* open picture file */
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char *fn;
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{
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if ((pictfp = fopen(fn, "r")) == NULL) {
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fprintf("%s: cannot open\n", fn);
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exit(1);
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}
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exposure = 1.0;
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getheader(pictfp, getexpos, NULL);
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if (wrongformat ||
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fgetresolu(&pxsiz, &pysiz, pictfp) != (YMAJOR|YDECR)) {
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fprintf("%s: bad picture format\n", fn);
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exit(1);
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}
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initscans();
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}
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close_pict() /* done with picture */
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{
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| 326 |
if (pictfp == NULL)
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return;
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fclose(pictfp);
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donescans();
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| 330 |
pictfp = NULL;
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}
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| 332 |
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fork_rtrace(av) /* open pipe and start rtrace */
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char *av[];
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| 336 |
{
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| 337 |
int p0[2], p1[2];
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| 338 |
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| 339 |
if (pipe(p0) < 0 || pipe(p1) < 0) {
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| 340 |
perror(progname);
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| 341 |
exit(1);
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| 342 |
}
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| 343 |
if ((rt_pid = vfork()) == 0) { /* if child */
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close(p0[1]);
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close(p1[0]);
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| 346 |
if (p0[0] != 0) { /* connect p0 to stdin */
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| 347 |
dup2(p0[0], 0);
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| 348 |
close(p0[0]);
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| 349 |
}
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| 350 |
if (p1[1] != 0) { /* connect p1 to stdout */
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| 351 |
dup2(p1[1], 1);
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| 352 |
close(p1[1]);
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| 353 |
}
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| 354 |
execvp(av[0], av);
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| 355 |
perror(av[0]);
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| 356 |
_exit(127);
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| 357 |
}
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| 358 |
if (rt_pid == -1) {
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| 359 |
perror(progname);
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| 360 |
exit(1);
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| 361 |
}
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| 362 |
close(p0[0]);
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| 363 |
close(p1[1]);
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| 364 |
fd_tort = p0[1];
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| 365 |
fd_fromrt = p1[0];
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| 366 |
}
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| 367 |
|
| 368 |
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| 369 |
done_rtrace() /* wait for rtrace to finish */
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| 370 |
{
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| 371 |
int pid, status;
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| 372 |
|
| 373 |
if (rt_pid == -1)
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| 374 |
return;
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| 375 |
close(fd_tort);
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| 376 |
close(fd_fromrt);
|
| 377 |
while ((pid = wait(&status)) != -1 && pid != rt_pid)
|
| 378 |
;
|
| 379 |
if (pid == rt_pid && status != 0) {
|
| 380 |
fprintf(stderr, "%s: bad status (%d) from rtrace\n",
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| 381 |
progname, status);
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| 382 |
exit(1);
|
| 383 |
}
|
| 384 |
rt_pid = -1;
|
| 385 |
}
|
| 386 |
|
| 387 |
|
| 388 |
int
|
| 389 |
readbuf(fd, bpos, siz)
|
| 390 |
int fd;
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| 391 |
char *bpos;
|
| 392 |
int siz;
|
| 393 |
{
|
| 394 |
register int cc, nrem = siz;
|
| 395 |
|
| 396 |
while (nrem > 0 && (cc = read(fd, bpos, nrem)) > 0) {
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| 397 |
bpos += cc;
|
| 398 |
nrem -= cc;
|
| 399 |
}
|
| 400 |
if (cc < 0)
|
| 401 |
return(cc);
|
| 402 |
return(siz-nrem);
|
| 403 |
}
|
| 404 |
|
| 405 |
|
| 406 |
int
|
| 407 |
writebuf(fd, bpos, siz)
|
| 408 |
char *bpos;
|
| 409 |
int siz;
|
| 410 |
{
|
| 411 |
register int cc, nrem = siz;
|
| 412 |
|
| 413 |
while (nrem > 0 && (cc = write(fd, bpos, nrem)) > 0) {
|
| 414 |
bpos += cc;
|
| 415 |
nrem -= cc;
|
| 416 |
}
|
| 417 |
if (cc < 0)
|
| 418 |
return(cc);
|
| 419 |
return(siz-nrem);
|
| 420 |
}
|
| 421 |
|
| 422 |
|
| 423 |
SCAN *
|
| 424 |
scanretire() /* retire old scanlines to free list */
|
| 425 |
{
|
| 426 |
SCAN *sold[NRETIRE];
|
| 427 |
int n;
|
| 428 |
int h;
|
| 429 |
register SCAN *sl;
|
| 430 |
register int i;
|
| 431 |
/* grab the NRETIRE oldest scanlines */
|
| 432 |
sold[n = 0] = NULL;
|
| 433 |
for (h = 0; h < HSIZE; h++)
|
| 434 |
for (sl = hashtab[h]; sl != NULL; sl = sl->next) {
|
| 435 |
for (i = n; i && sold[i-1]->lused > sl->lused; i--)
|
| 436 |
if (i < NRETIRE)
|
| 437 |
sold[i] = sold[i-1];
|
| 438 |
if (i < NRETIRE) {
|
| 439 |
sold[i] = sl;
|
| 440 |
if (n < NRETIRE) /* grow list */
|
| 441 |
n++;
|
| 442 |
}
|
| 443 |
}
|
| 444 |
/* put scanlines into free list */
|
| 445 |
for (i = 0; i < n; i++) {
|
| 446 |
h = shash(sold[i]->y);
|
| 447 |
sl = hashtab[h];
|
| 448 |
if (sl == sold[i])
|
| 449 |
hashtab[h] = sl->next;
|
| 450 |
else {
|
| 451 |
while (sl->next != sold[i]) /* IS in list */
|
| 452 |
sl = sl->next;
|
| 453 |
sl->next = sold[i]->next;
|
| 454 |
}
|
| 455 |
if (i > 0) { /* save oldest as return value */
|
| 456 |
sold[i]->next = freelist;
|
| 457 |
freelist = sold[i];
|
| 458 |
}
|
| 459 |
}
|
| 460 |
return(sold[0]);
|
| 461 |
}
|
| 462 |
|
| 463 |
|
| 464 |
static char *scan_buf;
|
| 465 |
|
| 466 |
|
| 467 |
initscans() /* initialize scanline buffers */
|
| 468 |
{
|
| 469 |
int scansize;
|
| 470 |
register SCAN *ptr;
|
| 471 |
register int i;
|
| 472 |
/* initialize positions */
|
| 473 |
scanpos = (long *)malloc(pysiz*sizeof(long));
|
| 474 |
if (scanpos == NULL)
|
| 475 |
memerr("scanline positions");
|
| 476 |
for (i = pysiz-1; i >= 0; i--)
|
| 477 |
scanpos[i] = -1L;
|
| 478 |
curpos = pysiz-1;
|
| 479 |
/* clear hash table */
|
| 480 |
for (i = 0; i < HSIZE; i++)
|
| 481 |
hashtab[i] = NULL;
|
| 482 |
/* allocate scanline buffers */
|
| 483 |
scansize = sizeof(SCAN) + pxsiz*sizeof(COLR);
|
| 484 |
#ifdef ALIGN
|
| 485 |
scansize = scansize+(sizeof(ALIGN)-1)) & ~(sizeof(ALIGN)-1);
|
| 486 |
#endif
|
| 487 |
i = MAXSBUF / scansize; /* compute number to allocate */
|
| 488 |
if (i > HSIZE)
|
| 489 |
i = HSIZE;
|
| 490 |
scan_buf = malloc(i*scansize); /* get in one big chunk */
|
| 491 |
if (scan_buf == NULL)
|
| 492 |
memerr("scanline buffers");
|
| 493 |
ptr = (SCAN *)scan_buf;
|
| 494 |
freelist = NULL; /* build our free list */
|
| 495 |
while (i-- > 0) {
|
| 496 |
ptr->y = -1;
|
| 497 |
ptr->lused = -1;
|
| 498 |
ptr->next = freelist;
|
| 499 |
freelist = ptr;
|
| 500 |
ptr = (SCAN *)((char *)ptr + scansize); /* beware of C bugs */
|
| 501 |
}
|
| 502 |
}
|
| 503 |
|
| 504 |
|
| 505 |
donescans() /* free up scanlines */
|
| 506 |
{
|
| 507 |
free(scan_buf);
|
| 508 |
free((char *)scanpos);
|
| 509 |
}
|
