36 |
|
int psample = 4; /* pixel sample size */ |
37 |
|
double maxdiff = .05; /* max. difference for interpolation */ |
38 |
|
double dstrpix = 0.67; /* square pixel distribution */ |
39 |
– |
int psuper = 2; /* pixel super-sampling rate */ |
39 |
|
|
40 |
|
double dstrsrc = 0.0; /* square source distribution */ |
41 |
|
double shadthresh = .05; /* shadow threshold */ |
42 |
|
double shadcert = .5; /* shadow certainty */ |
43 |
+ |
int directrelay = 0; /* number of source relays */ |
44 |
+ |
int vspretest = 512; /* virtual source pretest density */ |
45 |
+ |
int directinvis = 0; /* sources invisible? */ |
46 |
|
|
47 |
|
int maxdepth = 6; /* maximum recursion depth */ |
48 |
|
double minweight = 5e-3; /* minimum ray weight */ |
67 |
|
|
68 |
|
extern long nrays; /* number of rays traced */ |
69 |
|
|
70 |
< |
#define MAXDIV 32 /* maximum sample size */ |
70 |
> |
#define MAXDIV 15 /* maximum sample size */ |
71 |
|
|
72 |
|
#define pixjitter() (.5+dstrpix*(.5-frandom())) |
73 |
|
|
129 |
|
/* check sampling */ |
130 |
|
if (psample < 1) |
131 |
|
psample = 1; |
132 |
< |
else if (psample > MAXDIV) |
132 |
> |
else if (psample > MAXDIV) { |
133 |
> |
sprintf(errmsg, "pixel sampling reduced from %d to %d", |
134 |
> |
psample, MAXDIV); |
135 |
> |
error(WARNING, errmsg); |
136 |
|
psample = MAXDIV; |
137 |
+ |
} |
138 |
|
/* allocate scanlines */ |
139 |
|
for (i = 0; i <= psample; i++) { |
140 |
|
scanbar[i] = (COLOR *)malloc(hresolu*sizeof(COLOR)); |
167 |
|
pctdone = 100.0*i/vresolu; |
168 |
|
if (ralrm > 0) /* report init stats */ |
169 |
|
report(); |
170 |
+ |
#ifndef BSD |
171 |
+ |
else |
172 |
+ |
#endif |
173 |
+ |
signal(SIGALRM, report); |
174 |
|
ypos = vresolu-1 - i; |
175 |
|
fillscanline(scanbar[0], zbar[0], hresolu, ypos, psample); |
176 |
|
ystep = psample; |
192 |
|
/* fill bar */ |
193 |
|
fillscanbar(scanbar, zbar, hresolu, ypos, ystep); |
194 |
|
/* write it out */ |
195 |
+ |
#ifndef BSD |
196 |
+ |
signal(SIGALRM, SIG_IGN); /* don't interrupt writes */ |
197 |
+ |
#endif |
198 |
|
for (i = ystep; i > 0; i--) { |
199 |
|
if (zfd != -1 && write(zfd, (char *)zbar[i], |
200 |
|
hresolu*sizeof(float)) |
209 |
|
pctdone = 100.0*(vresolu-1-ypos)/vresolu; |
210 |
|
if (ralrm > 0 && time((long *)0) >= tlastrept+ralrm) |
211 |
|
report(); |
212 |
+ |
#ifndef BSD |
213 |
+ |
else |
214 |
+ |
signal(SIGALRM, report); |
215 |
+ |
#endif |
216 |
|
} |
217 |
|
/* clean up */ |
218 |
|
if (zfd != -1) { |
365 |
|
|
366 |
|
rayorigin(&thisray, NULL, PRIMARY, 1.0); |
367 |
|
|
368 |
< |
samplendx = 3*y + x; /* set pixel index */ |
368 |
> |
samplendx = pixnumber(x,y,hresolu,vresolu); /* set pixel index */ |
369 |
|
|
370 |
|
rayvalue(&thisray); /* trace ray */ |
371 |
|
|
424 |
|
return(y); |
425 |
|
writerr: |
426 |
|
error(SYSTEM, "write error in salvage"); |
427 |
+ |
} |
428 |
+ |
|
429 |
+ |
|
430 |
+ |
int |
431 |
+ |
pixnumber(x, y, xres, yres) /* compute pixel index (brushed) */ |
432 |
+ |
register int x, y; |
433 |
+ |
int xres, yres; |
434 |
+ |
{ |
435 |
+ |
x -= y; |
436 |
+ |
while (x < 0) |
437 |
+ |
x += xres; |
438 |
+ |
return((((x>>2)*yres + y) << 2) + (x & 3)); |
439 |
|
} |