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/* Copyright (c) 1986 Regents of the University of California */ |
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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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#else |
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#include <signal.h> |
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#endif |
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#include <sys/fcntl.h> |
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#include <fcntl.h> |
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#include "view.h" |
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#include "random.h" |
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int dimlist[MAXDIM]; /* sampling dimensions */ |
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int ndims = 0; /* number of sampling dimensions */ |
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int samplendx; /* sample index number */ |
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|
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VIEW ourview = STDVIEW; /* view parameters */ |
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int hresolu = 512; /* horizontal resolution */ |
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int vresolu = 512; /* vertical resolution */ |
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double dstrsrc = 0.0; /* square source distribution */ |
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double shadthresh = .05; /* shadow threshold */ |
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double shadcert = .5; /* shadow certainty */ |
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int directrelay = 0; /* number of source relays */ |
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int vspretest = 512; /* virtual source pretest density */ |
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int maxdepth = 6; /* maximum recursion depth */ |
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double minweight = 5e-3; /* minimum ray weight */ |
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double pctdone = 0.0; /* percentage done */ |
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long tlastrept = 0L; /* time at last report */ |
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extern long time(); |
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extern long tstart; /* starting time */ |
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extern long nrays; /* number of rays traced */ |
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#define MAXDIV 32 /* maximum sample size */ |
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#define MAXDIV 15 /* maximum sample size */ |
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#define pixjitter() (.5+dstrpix*(.5-frandom())) |
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} |
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#ifdef BSD |
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report() /* report progress */ |
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{ |
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#ifdef BSD |
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struct rusage rubuf; |
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double t; |
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sprintf(errmsg, "%ld rays, %4.2f%% done after %5.4f CPU hours\n", |
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nrays, pctdone, t/3600.0); |
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eputs(errmsg); |
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tlastrept = time((long *)0); |
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} |
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#else |
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report() /* report progress */ |
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{ |
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signal(SIGALRM, report); |
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sprintf(errmsg, "%ld rays, %4.2f%% done\n", nrays, pctdone); |
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#endif |
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tlastrept = time((long *)0); |
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sprintf(errmsg, "%ld rays, %4.2f%% done after %5.4f hours\n", |
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nrays, pctdone, (tlastrept-tstart)/3600.0); |
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eputs(errmsg); |
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if (ralrm > 0) |
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alarm(ralrm); |
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} |
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#endif |
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render(zfile, oldfile) /* render the scene */ |
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/* check sampling */ |
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if (psample < 1) |
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psample = 1; |
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else if (psample > MAXDIV) |
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else if (psample > MAXDIV) { |
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sprintf(errmsg, "pixel sampling reduced from %d to %d", |
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psample, MAXDIV); |
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error(WARNING, errmsg); |
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psample = MAXDIV; |
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} |
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/* allocate scanlines */ |
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for (i = 0; i <= psample; i++) { |
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scanbar[i] = (COLOR *)malloc(hresolu*sizeof(COLOR)); |
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fputresolu(YMAJOR|YDECR, hresolu, vresolu, stdout); |
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/* recover file and compute first */ |
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i = salvage(oldfile); |
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if (zfd != -1 && lseek(zfd, (long)i*hresolu*sizeof(float), 0) == -1) |
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if (zfd != -1 && i > 0 && |
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lseek(zfd, (long)i*hresolu*sizeof(float), 0) == -1) |
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error(SYSTEM, "z file seek error in render"); |
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pctdone = 100.0*i/vresolu; |
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if (ralrm > 0) /* report init stats */ |
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report(); |
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ypos = vresolu-1 - i; |
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fillscanline(scanbar[0], zbar[0], hresolu, ypos, psample); |
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ystep = psample; |
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/* compute scanlines */ |
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for (ypos -= ystep; ypos > -ystep; ypos -= ystep) { |
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/* record progress */ |
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pctdone = 100.0*(vresolu-ypos-ystep)/vresolu; |
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/* bottom adjust? */ |
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if (ypos < 0) { |
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ystep += ypos; |
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} |
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if (fflush(stdout) == EOF) |
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goto writerr; |
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/* record progress */ |
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pctdone = 100.0*(vresolu-1-ypos)/vresolu; |
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if (ralrm > 0 && time((long *)0) >= tlastrept+ralrm) |
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report(); |
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} |
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/* clean up */ |
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if (zfd != -1) { |
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if (write(zfd, (char *)zbar[0], hresolu*sizeof(float)) |
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< hresolu*sizeof(float)) |
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goto writerr; |
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close(zfd); |
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if (close(zfd) == -1) |
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goto writerr; |
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for (i = 0; i <= psample; i++) |
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free((char *)zbar[i]); |
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} |
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COLOR vline[MAXDIV+1]; |
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float zline[MAXDIV+1]; |
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int b = ysize; |
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double z; |
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register int i, j; |
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for (i = 0; i < xres; i++) { |
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COLOR col; /* returned color */ |
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int x, y; /* pixel position */ |
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{ |
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static RAY thisray; /* our ray for this pixel */ |
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static RAY thisray; |
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viewray(thisray.rorg, thisray.rdir, &ourview, |
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(x+pixjitter())/hresolu, (y+pixjitter())/vresolu); |
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if (viewray(thisray.rorg, thisray.rdir, &ourview, |
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(x+pixjitter())/hresolu, (y+pixjitter())/vresolu) < 0) { |
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setcolor(col, 0.0, 0.0, 0.0); |
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return(0.0); |
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} |
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rayorigin(&thisray, NULL, PRIMARY, 1.0); |
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samplendx = 3*y + x; /* set pixel index */ |
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rayvalue(&thisray); /* trace ray */ |
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copycolor(col, thisray.rcol); /* return color */ |
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return(thisray.rot); /* return distance */ |
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return(thisray.rt); /* return distance */ |
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} |
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