| 20 |
|
#define vfork fork |
| 21 |
|
#endif |
| 22 |
|
|
| 23 |
< |
#define NSCANS 16 /* number of scanlines to buffer */ |
| 23 |
> |
#define NSCANS 32 /* number of scanlines to buffer */ |
| 24 |
|
|
| 25 |
|
int rt_pid = -1; /* process id for rtrace */ |
| 26 |
|
int fd_tort, fd_fromrt; /* pipe descriptors */ |
| 36 |
|
COLR *sl; /* scanline contents */ |
| 37 |
|
} scan[NSCANS]; /* buffered scanlines */ |
| 38 |
|
|
| 39 |
+ |
static long ncall = 0L; /* number of calls to getpictscan */ |
| 40 |
+ |
static long nread = 0L; /* number of scanlines read */ |
| 41 |
|
|
| 42 |
+ |
|
| 43 |
|
COLR * |
| 44 |
|
getpictscan(y) /* get picture scanline */ |
| 45 |
|
int y; |
| 46 |
|
{ |
| 47 |
|
extern long ftell(); |
| 45 |
– |
static long ncall = 0; |
| 48 |
|
int minused; |
| 49 |
|
register int i; |
| 50 |
|
/* first check our buffers */ |
| 60 |
|
} |
| 61 |
|
/* not there, read it in */ |
| 62 |
|
if (scanpos[y] == -1) { /* need to search */ |
| 61 |
– |
if (verbose) |
| 62 |
– |
fprintf(stderr, "%s: reading picture...\n", |
| 63 |
– |
progname); |
| 63 |
|
while (curpos > y) { |
| 64 |
|
scanpos[curpos] = ftell(pictfp); |
| 65 |
|
if (freadcolrs(scan[minused].sl, pxsiz, pictfp) < 0) |
| 70 |
|
fprintf(stderr, "%s: picture seek error\n", progname); |
| 71 |
|
exit(1); |
| 72 |
|
} |
| 74 |
– |
if (verbose) |
| 75 |
– |
fprintf(stderr, "%s: reading scanline %d...\n", progname, y); |
| 73 |
|
if (freadcolrs(scan[minused].sl, pxsiz, pictfp) < 0) |
| 74 |
|
goto readerr; |
| 75 |
+ |
nread++; |
| 76 |
|
curpos = y-1; |
| 77 |
|
scan[minused].lused = ncall; |
| 78 |
|
scan[minused].y = y; |
| 83 |
|
} |
| 84 |
|
|
| 85 |
|
|
| 86 |
+ |
pict_stats() /* print out picture read statistics */ |
| 87 |
+ |
{ |
| 88 |
+ |
static long lastcall = 0L; /* ncall at last report */ |
| 89 |
+ |
static long lastread = 0L; /* nread at last report */ |
| 90 |
+ |
|
| 91 |
+ |
if (ncall == lastcall) |
| 92 |
+ |
return; |
| 93 |
+ |
fprintf(stderr, "%s: %ld scanlines read, %ld reused\n", |
| 94 |
+ |
progname, nread-lastread, |
| 95 |
+ |
(ncall-lastcall)-(nread-lastread)); |
| 96 |
+ |
lastcall = ncall; |
| 97 |
+ |
lastread = nread; |
| 98 |
+ |
} |
| 99 |
+ |
|
| 100 |
+ |
|
| 101 |
|
double |
| 102 |
|
pict_val(vd) /* find picture value for view direction */ |
| 103 |
|
FVECT vd; |
| 175 |
|
vb[buf_vh[i]+hsize] = luminance(rt_buf+3*i); |
| 176 |
|
npix_tort = 0; |
| 177 |
|
} |
| 178 |
< |
rt_buf[npix_tort] = ourview.vp[0]; |
| 179 |
< |
rt_buf[npix_tort+1] = ourview.vp[1]; |
| 180 |
< |
rt_buf[npix_tort+2] = ourview.vp[2]; |
| 181 |
< |
rt_buf[npix_tort+3] = dir[0]; |
| 182 |
< |
rt_buf[npix_tort+4] = dir[1]; |
| 183 |
< |
rt_buf[npix_tort+5] = dir[2]; |
| 178 |
> |
rt_buf[6*npix_tort] = ourview.vp[0]; |
| 179 |
> |
rt_buf[6*npix_tort+1] = ourview.vp[1]; |
| 180 |
> |
rt_buf[6*npix_tort+2] = ourview.vp[2]; |
| 181 |
> |
rt_buf[6*npix_tort+3] = dir[0]; |
| 182 |
> |
rt_buf[6*npix_tort+4] = dir[1]; |
| 183 |
> |
rt_buf[6*npix_tort+5] = dir[2]; |
| 184 |
|
buf_vh[npix_tort++] = vh; |
| 185 |
|
} |
| 186 |
|
if (npix_tort > 0) { /* process pending buffer */ |
| 188 |
|
for (i = 0; i < npix_tort; i++) |
| 189 |
|
vb[buf_vh[i]+hsize] = luminance(rt_buf+3*i); |
| 190 |
|
} |
| 191 |
+ |
if (verbose) |
| 192 |
+ |
pict_stats(); |
| 193 |
|
} |
| 194 |
|
|
| 195 |
|
|
