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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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+ |
|
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+ |
#include <signal.h> |
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#include <fcntl.h> |
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|
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#include "view.h" |
| 40 |
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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 directrelay = 1; /* 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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+ |
double srcsizerat = .25; /* maximum ratio source size/dist. */ |
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|
| 48 |
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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; |
| 128 |
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COLOR *colptr; |
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float *zptr; |
| 169 |
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pctdone = 100.0*i/vresolu; |
| 170 |
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if (ralrm > 0) /* report init stats */ |
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report(); |
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+ |
#ifndef BSD |
| 173 |
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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; |
| 177 |
< |
fillscanline(scanbar[0], zbar[0], hresolu, ypos, psample); |
| 178 |
< |
ystep = psample; |
| 177 |
> |
hstep = (psample*140+49)/99; /* quincunx sampling */ |
| 178 |
> |
ystep = (psample*99+70)/140; |
| 179 |
> |
fillscanline(scanbar[0], zbar[0], hresolu, ypos, hstep); |
| 180 |
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/* compute scanlines */ |
| 181 |
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for (ypos -= ystep; ypos > -ystep; ypos -= ystep) { |
| 182 |
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/* bottom adjust? */ |
| 191 |
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zbar[ystep] = zbar[0]; |
| 192 |
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zbar[0] = zptr; |
| 193 |
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/* fill base line */ |
| 194 |
< |
fillscanline(scanbar[0], zbar[0], hresolu, ypos, psample); |
| 194 |
> |
fillscanline(scanbar[0], zbar[0], hresolu, ypos, hstep); |
| 195 |
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/* fill bar */ |
| 196 |
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fillscanbar(scanbar, zbar, hresolu, ypos, ystep); |
| 197 |
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/* write it out */ |
| 198 |
+ |
#ifndef BSD |
| 199 |
+ |
signal(SIGALRM, SIG_IGN); /* don't interrupt writes */ |
| 200 |
+ |
#endif |
| 201 |
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for (i = ystep; i > 0; i--) { |
| 202 |
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if (zfd != -1 && write(zfd, (char *)zbar[i], |
| 203 |
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hresolu*sizeof(float)) |
| 212 |
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pctdone = 100.0*(vresolu-1-ypos)/vresolu; |
| 213 |
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if (ralrm > 0 && time((long *)0) >= tlastrept+ralrm) |
| 214 |
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report(); |
| 215 |
+ |
#ifndef BSD |
| 216 |
+ |
else |
| 217 |
+ |
signal(SIGALRM, report); |
| 218 |
+ |
#endif |
| 219 |
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} |
| 220 |
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/* clean up */ |
| 221 |
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if (zfd != -1) { |
| 246 |
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register float *zline; |
| 247 |
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int xres, y, xstep; |
| 248 |
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{ |
| 249 |
+ |
static int nc = 0; /* number of calls */ |
| 250 |
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int b = xstep; |
| 251 |
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double z; |
| 252 |
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register int i; |
| 253 |
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|
| 254 |
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z = pixvalue(scanline[0], 0, y); |
| 255 |
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if (zline) zline[0] = z; |
| 256 |
< |
|
| 257 |
< |
for (i = xstep; i < xres-1+xstep; i += xstep) { |
| 256 |
> |
/* zig-zag start for quincunx pattern */ |
| 257 |
> |
for (i = nc++ & 1 ? xstep/2 : xstep; i < xres-1+xstep; i += xstep) { |
| 258 |
|
if (i >= xres) { |
| 259 |
|
xstep += xres-1-i; |
| 260 |
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i = xres-1; |
