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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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#include "random.h" |
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|
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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 directinvis = 0; /* sources invisible? */ |
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|
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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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|
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extern long time(); |
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extern long tstart; /* starting time */ |
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|
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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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|
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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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float *zbar[MAXDIV+1]; /* z values */ |
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int ypos; /* current scanline */ |
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int ystep; /* current y step size */ |
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int hstep; /* h step size */ |
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int zfd; |
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COLOR *colptr; |
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float *zptr; |
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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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#ifndef BSD |
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else |
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#endif |
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signal(SIGALRM, 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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hstep = (psample*140+49)/99; /* quincunx sampling */ |
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ystep = (psample*99+70)/140; |
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fillscanline(scanbar[0], zbar[0], hresolu, ypos, hstep); |
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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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zbar[ystep] = zbar[0]; |
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zbar[0] = zptr; |
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/* fill base line */ |
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fillscanline(scanbar[0], zbar[0], hresolu, ypos, psample); |
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fillscanline(scanbar[0], zbar[0], hresolu, ypos, hstep); |
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/* fill bar */ |
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fillscanbar(scanbar, zbar, hresolu, ypos, ystep); |
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/* write it out */ |
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#ifndef BSD |
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signal(SIGALRM, SIG_IGN); /* don't interrupt writes */ |
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#endif |
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for (i = ystep; i > 0; i--) { |
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if (zfd != -1 && write(zfd, (char *)zbar[i], |
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hresolu*sizeof(float)) |
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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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#ifndef BSD |
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else |
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signal(SIGALRM, report); |
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#endif |
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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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register float *zline; |
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int xres, y, xstep; |
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{ |
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static int nc = 0; /* number of calls */ |
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int b = xstep; |
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double z; |
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register int i; |
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z = pixvalue(scanline[0], 0, y); |
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if (zline) zline[0] = z; |
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for (i = xstep; i < xres-1+xstep; i += xstep) { |
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/* zig-zag start for quincunx pattern */ |
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for (i = nc++ & 1 ? xstep/2 : xstep; i < xres-1+xstep; i += xstep) { |
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if (i >= xres) { |
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xstep += xres-1-i; |
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i = xres-1; |
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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 = pixnumber(x,y,hresolu,vresolu); /* 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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return(y); |
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writerr: |
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error(SYSTEM, "write error in salvage"); |
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} |
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|
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int |
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pixnumber(x, y, xres, yres) /* compute pixel index (brushed) */ |
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register int x, y; |
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int xres, yres; |
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{ |
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x -= y; |
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while (x < 0) |
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x += xres; |
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return((((x>>2)*yres + y) << 2) + (x & 3)); |
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} |