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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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#endif
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/*
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* Compute pixels for glare calculation
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*/
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#include "glare.h"
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#include <sys/param.h>
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/* compute rtrace buffer size */
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#ifndef PIPE_BUF
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#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 NSCANS 64 /* number of scanlines to buffer */
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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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int curpos; /* current scanline */
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long *scanpos; /* scanline positions */
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struct {
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long lused; /* for LRU replacement */
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int y; /* scanline position */
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COLR *sl; /* scanline contents */
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} scan[NSCANS]; /* buffered scanlines */
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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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extern long ftell();
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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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int minused;
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register int i;
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/* first check our buffers */
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ncall++;
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minused = 0;
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for (i = 0; i < NSCANS; i++) {
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if (scan[i].y == y) {
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scan[i].lused = ncall;
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return(scan[i].sl);
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}
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if (scan[i].lused < scan[minused].lused)
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minused = i;
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}
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/* not there, read it in */
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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(scan[minused].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(scan[minused].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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scan[minused].lused = ncall;
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scan[minused].y = y;
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return(scan[minused].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) /* 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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if (compdir(dir, vh, vv) < 0)
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return(-1.0);
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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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return(-1.0);
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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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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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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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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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continue;
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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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if (isexpos(s))
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exposure *= exposval(s);
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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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register int i;
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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);
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if (fgetresolu(&pxsiz, &pysiz, pictfp) != (YMAJOR|YDECR)) {
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fprintf("%s: bad picture resolution\n", fn);
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exit(1);
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}
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scanpos = (long *)malloc(pysiz*sizeof(long));
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if (scanpos == NULL)
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memerr("scanline positions");
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for (i = pysiz-1; i >= 0; i--)
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scanpos[i] = -1L;
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curpos = pysiz-1;
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for (i = 0; i < NSCANS; i++) {
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scan[i].lused = -1;
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scan[i].y = -1;
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scan[i].sl = (COLR *)malloc(pxsiz*sizeof(COLR));
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if (scan[i].sl == NULL)
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memerr("scanline buffers");
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}
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}
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close_pict() /* done with picture */
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{
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register int i;
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if (pictfp == NULL)
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return;
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fclose(pictfp);
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free((char *)scanpos);
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for (i = 0; i < NSCANS; i++)
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free((char *)scan[i].sl);
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pictfp = NULL;
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}
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fork_rtrace(av) /* open pipe and start rtrace */
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char *av[];
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{
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int p0[2], p1[2];
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if (pipe(p0) < 0 || pipe(p1) < 0) {
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perror(progname);
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exit(1);
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}
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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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if (p0[0] != 0) { /* connect p0 to stdin */
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dup2(p0[0], 0);
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close(p0[0]);
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}
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if (p1[1] != 0) { /* connect p1 to stdout */
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dup2(p1[1], 1);
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close(p1[1]);
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}
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execvp(av[0], av);
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perror(av[0]);
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_exit(127);
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}
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if (rt_pid == -1) {
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perror(progname);
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exit(1);
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}
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close(p0[0]);
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close(p1[1]);
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fd_tort = p0[1];
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fd_fromrt = p1[0];
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}
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done_rtrace() /* wait for rtrace to finish */
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{
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int pid, status;
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if (rt_pid == -1)
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return;
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close(fd_tort);
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close(fd_fromrt);
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while ((pid = wait(&status)) != -1 && pid != rt_pid)
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;
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if (pid == rt_pid && status != 0) {
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fprintf(stderr, "%s: bad status (%d) from rtrace\n",
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progname, status);
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exit(1);
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}
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rt_pid = -1;
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}
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int
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readbuf(fd, bpos, siz)
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int fd;
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char *bpos;
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int siz;
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{
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register int cc, nrem = siz;
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while (nrem > 0 && (cc = read(fd, bpos, nrem)) > 0) {
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bpos += cc;
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nrem -= cc;
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}
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if (cc < 0)
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return(cc);
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return(siz-nrem);
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}
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int
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writebuf(fd, bpos, siz)
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char *bpos;
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int siz;
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{
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register int cc, nrem = siz;
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while (nrem > 0 && (cc = write(fd, bpos, nrem)) > 0) {
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bpos += cc;
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nrem -= cc;
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}
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if (cc < 0)
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return(cc);
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return(siz-nrem);
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}
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