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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 <signal.h> |
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#include <fcntl.h> |
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#include "view.h" |
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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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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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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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/* bottom adjust? */ |
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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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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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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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|
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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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|
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rayorigin(&thisray, NULL, PRIMARY, 1.0); |
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|
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samplendx = 3*y + x; /* set pixel index */ |
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samplendx = pixnumber(x,y,hresolu,vresolu); /* set pixel index */ |
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|
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rayvalue(&thisray); /* trace ray */ |
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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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|
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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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} |
