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/* Copyright (c) 1986 Regents of the University of California */ |
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|
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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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/* |
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* rpict.c - routines and variables for picture generation. |
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* |
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* 8/14/85 |
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*/ |
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|
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#include "ray.h" |
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|
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#ifdef BSD |
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#include <sys/time.h> |
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#include <sys/resource.h> |
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#else |
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#include <signal.h> |
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#endif |
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#include <fcntl.h> |
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|
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#include "view.h" |
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|
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#include "random.h" |
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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 pixaspect = 1.0; /* pixel aspect ratio */ |
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|
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int psample = 4; /* pixel sample size */ |
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double maxdiff = .05; /* max. difference for interpolation */ |
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double dstrpix = 0.67; /* square pixel distribution */ |
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|
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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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|
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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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|
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COLOR ambval = BLKCOLOR; /* ambient value */ |
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double ambacc = 0.2; /* ambient accuracy */ |
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int ambres = 32; /* ambient resolution */ |
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int ambdiv = 128; /* ambient divisions */ |
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int ambssamp = 0; /* ambient super-samples */ |
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int ambounce = 0; /* ambient bounces */ |
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char *amblist[128]; /* ambient include/exclude list */ |
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int ambincl = -1; /* include == 1, exclude == 0 */ |
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|
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int ralrm = 0; /* seconds between reports */ |
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|
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double pctdone = 0.0; /* percentage done */ |
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|
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extern long nrays; /* number of rays traced */ |
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|
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#define MAXDIV 32 /* maximum sample size */ |
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|
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#define pixjitter() (.5+dstrpix*(.5-frandom())) |
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|
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double pixvalue(); |
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|
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|
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quit(code) /* quit program */ |
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int code; |
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{ |
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if (code || ralrm > 0) /* report status */ |
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report(); |
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|
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exit(code); |
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} |
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|
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|
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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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|
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getrusage(RUSAGE_SELF, &rubuf); |
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t = (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6; |
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t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec; |
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getrusage(RUSAGE_CHILDREN, &rubuf); |
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t += (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6; |
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t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec; |
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|
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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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#else |
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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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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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|
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|
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render(zfile, oldfile) /* render the scene */ |
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char *zfile, *oldfile; |
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{ |
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extern long lseek(); |
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COLOR *scanbar[MAXDIV+1]; /* scanline arrays of pixel values */ |
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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 zfd; |
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COLOR *colptr; |
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float *zptr; |
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register int i; |
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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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psample = MAXDIV; |
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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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if (scanbar[i] == NULL) |
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goto memerr; |
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} |
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/* open z file */ |
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if (zfile != NULL) { |
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if ((zfd = open(zfile, O_WRONLY|O_CREAT, 0666)) == -1) { |
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sprintf(errmsg, "cannot open z file \"%s\"", zfile); |
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error(SYSTEM, errmsg); |
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} |
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for (i = 0; i <= psample; i++) { |
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zbar[i] = (float *)malloc(hresolu*sizeof(float)); |
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if (zbar[i] == NULL) |
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goto memerr; |
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} |
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} else { |
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zfd = -1; |
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for (i = 0; i <= psample; i++) |
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zbar[i] = NULL; |
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} |
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/* write out boundaries */ |
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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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error(SYSTEM, "z file seek error in render"); |
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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-1-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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ypos = 0; |
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} |
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colptr = scanbar[ystep]; /* move base to top */ |
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scanbar[ystep] = scanbar[0]; |
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scanbar[0] = colptr; |
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zptr = zbar[ystep]; |
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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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/* fill bar */ |
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fillscanbar(scanbar, zbar, hresolu, ypos, ystep); |
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/* write it out */ |
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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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< hresolu*sizeof(float)) |
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goto writerr; |
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if (fwritescan(scanbar[i], hresolu, stdout) < 0) |
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goto writerr; |
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} |
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if (fflush(stdout) == EOF) |
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goto writerr; |
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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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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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fwritescan(scanbar[0], hresolu, stdout); |
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if (fflush(stdout) == EOF) |
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goto writerr; |
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for (i = 0; i <= psample; i++) |
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free((char *)scanbar[i]); |
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pctdone = 100.0; |
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return; |
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writerr: |
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error(SYSTEM, "write error in render"); |
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memerr: |
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error(SYSTEM, "out of memory in render"); |
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} |
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|
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|
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fillscanline(scanline, zline, xres, y, xstep) /* fill scan line at y */ |
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register COLOR *scanline; |
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register float *zline; |
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int xres, y, xstep; |
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{ |
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int b = xstep; |
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double z; |
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register int i; |
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|
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z = pixvalue(scanline[0], 0, y); |
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if (zline) zline[0] = z; |
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|
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for (i = 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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} |
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z = pixvalue(scanline[i], i, y); |
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if (zline) zline[i] = z; |
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|
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b = fillsample(scanline+i-xstep, zline ? zline+i-xstep : NULL, |
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i-xstep, y, xstep, 0, b/2); |
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} |
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} |
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|
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|
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fillscanbar(scanbar, zbar, xres, y, ysize) /* fill interior */ |
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register COLOR *scanbar[]; |
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register float *zbar[]; |
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int xres, y, ysize; |
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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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|
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for (i = 0; i < xres; i++) { |
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|
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copycolor(vline[0], scanbar[0][i]); |
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copycolor(vline[ysize], scanbar[ysize][i]); |
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if (zbar[0]) { |
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zline[0] = zbar[0][i]; |
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zline[ysize] = zbar[ysize][i]; |
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} |
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|
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b = fillsample(vline, zbar[0] ? zline : NULL, |
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i, y, 0, ysize, b/2); |
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|
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for (j = 1; j < ysize; j++) |
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copycolor(scanbar[j][i], vline[j]); |
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if (zbar[0]) |
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for (j = 1; j < ysize; j++) |
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zbar[j][i] = zline[j]; |
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} |
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} |
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|
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|
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int |
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fillsample(colline, zline, x, y, xlen, ylen, b) /* fill interior points */ |
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register COLOR *colline; |
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register float *zline; |
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int x, y; |
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int xlen, ylen; |
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int b; |
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{ |
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extern double fabs(); |
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double ratio; |
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double z; |
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COLOR ctmp; |
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int ncut; |
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register int len; |
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|
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if (xlen > 0) /* x or y length is zero */ |
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len = xlen; |
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else |
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len = ylen; |
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|
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if (len <= 1) /* limit recursion */ |
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return(0); |
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|
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if (b > 0 |
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|| (zline && 2.*fabs(zline[0]-zline[len]) > maxdiff*(zline[0]+zline[len])) |
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|| bigdiff(colline[0], colline[len], maxdiff)) { |
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|
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z = pixvalue(colline[len>>1], x + (xlen>>1), y + (ylen>>1)); |
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if (zline) zline[len>>1] = z; |
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ncut = 1; |
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|
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} else { /* interpolate */ |
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|
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copycolor(colline[len>>1], colline[len]); |
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ratio = (double)(len>>1) / len; |
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scalecolor(colline[len>>1], ratio); |
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if (zline) zline[len>>1] = zline[len] * ratio; |
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ratio = 1.0 - ratio; |
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copycolor(ctmp, colline[0]); |
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scalecolor(ctmp, ratio); |
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addcolor(colline[len>>1], ctmp); |
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if (zline) zline[len>>1] += zline[0] * ratio; |
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ncut = 0; |
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} |
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/* recurse */ |
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ncut += fillsample(colline, zline, x, y, xlen>>1, ylen>>1, (b-1)/2); |
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|
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ncut += fillsample(colline+(len>>1), zline ? zline+(len>>1) : NULL, |
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x+(xlen>>1), y+(ylen>>1), |
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xlen-(xlen>>1), ylen-(ylen>>1), b/2); |
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|
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return(ncut); |
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} |
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|
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|
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double |
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pixvalue(col, x, y) /* compute pixel value */ |
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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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|
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viewray(thisray.rorg, thisray.rdir, &ourview, |
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(x+pixjitter())/hresolu, (y+pixjitter())/vresolu); |
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|
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rayorigin(&thisray, NULL, PRIMARY, 1.0); |
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|
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rayvalue(&thisray); /* trace ray */ |
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|
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copycolor(col, thisray.rcol); /* return color */ |
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|
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return(thisray.rt); /* return distance */ |
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} |
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|
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|
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int |
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salvage(oldfile) /* salvage scanlines from killed program */ |
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char *oldfile; |
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{ |
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COLR *scanline; |
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FILE *fp; |
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int x, y; |
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|
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if (oldfile == NULL) |
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return(0); |
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|
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if ((fp = fopen(oldfile, "r")) == NULL) { |
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sprintf(errmsg, "cannot open recover file \"%s\"", oldfile); |
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error(WARNING, errmsg); |
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return(0); |
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} |
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/* discard header */ |
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getheader(fp, NULL); |
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/* get picture size */ |
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if (fgetresolu(&x, &y, fp) != (YMAJOR|YDECR)) { |
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sprintf(errmsg, "bad recover file \"%s\"", oldfile); |
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error(WARNING, errmsg); |
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fclose(fp); |
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return(0); |
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} |
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|
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if (x != hresolu || y != vresolu) { |
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sprintf(errmsg, "resolution mismatch in recover file \"%s\"", |
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oldfile); |
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error(USER, errmsg); |
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} |
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|
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scanline = (COLR *)malloc(hresolu*sizeof(COLR)); |
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if (scanline == NULL) |
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error(SYSTEM, "out of memory in salvage"); |
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for (y = 0; y < vresolu; y++) { |
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if (freadcolrs(scanline, hresolu, fp) < 0) |
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break; |
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if (fwritecolrs(scanline, hresolu, stdout) < 0) |
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goto writerr; |
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} |
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if (fflush(stdout) == EOF) |
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goto writerr; |
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free((char *)scanline); |
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fclose(fp); |
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unlink(oldfile); |
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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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} |
