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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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#endif |
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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(512); /* view parameters */ |
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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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static int xres, yres; /* output x and y resolution */ |
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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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|
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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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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(oldfile) /* render the scene */ |
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char *oldfile; |
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{ |
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COLOR *scanbar[MAXDIV+1]; /* scanline arrays of pixel values */ |
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int ypos; /* current scanline */ |
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COLOR *colptr; |
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register int i; |
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|
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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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/* output resolution may be smaller */ |
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xres = ourview.hresolu - (ourview.hresolu % psample); |
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yres = ourview.vresolu - (ourview.vresolu % psample); |
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|
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for (i = 0; i <= psample; i++) { |
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scanbar[i] = (COLOR *)malloc((xres+1)*sizeof(COLOR)); |
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if (scanbar[i] == NULL) |
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error(SYSTEM, "out of memory in render"); |
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} |
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/* write out boundaries */ |
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fputresolu(YMAJOR|YDECR, xres, yres, stdout); |
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|
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ypos = yres - salvage(oldfile); /* find top line */ |
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fillscanline(scanbar[0], ypos, psample); /* top scan */ |
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|
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for (ypos -= psample; ypos > -psample; ypos -= psample) { |
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|
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colptr = scanbar[psample]; /* get last scanline */ |
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scanbar[psample] = scanbar[0]; |
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scanbar[0] = colptr; |
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|
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fillscanline(scanbar[0], ypos, psample); /* base scan */ |
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|
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fillscanbar(scanbar, ypos, psample); |
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|
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for (i = psample-1; i >= 0; i--) |
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if (fwritescan(scanbar[i], xres, stdout) < 0) |
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goto writerr; |
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if (fflush(stdout) == EOF) |
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goto writerr; |
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pctdone = 100.0*(yres-ypos)/yres; |
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} |
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|
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for (i = 0; i <= psample; i++) |
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free((char *)scanbar[i]); |
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return; |
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writerr: |
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error(SYSTEM, "write error in render"); |
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} |
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|
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|
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fillscanline(scanline, y, xstep) /* fill scan line at y */ |
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register COLOR *scanline; |
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int y, xstep; |
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{ |
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int b = xstep; |
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register int i; |
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|
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pixvalue(scanline[0], 0, y); |
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|
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for (i = xstep; i <= xres; i += xstep) { |
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|
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pixvalue(scanline[i], i, y); |
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|
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b = fillsample(scanline+i-xstep, 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, y, ysize) /* fill interior */ |
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register COLOR *scanbar[]; |
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int y, ysize; |
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{ |
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COLOR vline[MAXDIV+1]; |
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int b = ysize; |
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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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|
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b = fillsample(vline, 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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} |
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} |
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|
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|
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int |
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fillsample(colline, x, y, xlen, ylen, b) /* fill interior points */ |
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register COLOR *colline; |
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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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double ratio; |
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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 || bigdiff(colline[0], colline[len], maxdiff)) { |
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|
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pixvalue(colline[len>>1], x + (xlen>>1), y + (ylen>>1)); |
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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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copycolor(ctmp, colline[0]); |
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ratio = 1.0 - ratio; |
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scalecolor(ctmp, ratio); |
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addcolor(colline[len>>1], ctmp); |
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ncut = 0; |
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} |
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/* recurse */ |
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ncut += fillsample(colline, x, y, xlen>>1, ylen>>1, (b-1)/2); |
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|
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ncut += fillsample(colline + (len>>1), 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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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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rayview(thisray.rorg, thisray.rdir, &ourview, |
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x + pixjitter(), y + pixjitter()); |
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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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|
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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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else 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 != xres || y != yres) { |
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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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return(0); |
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} |
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|
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scanline = (COLR *)malloc(xres*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 < yres; y++) { |
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if (freadcolrs(scanline, xres, fp) < 0) |
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break; |
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if (fwritecolrs(scanline, xres, 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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} |
