| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: glareval.c,v 2.18 2020/05/14 20:58:03 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Compute pixels for glare calculation |
| 6 |
*/ |
| 7 |
|
| 8 |
#include "copyright.h" |
| 9 |
|
| 10 |
#include <stdlib.h> |
| 11 |
#include <string.h> |
| 12 |
|
| 13 |
#include "platform.h" |
| 14 |
#include "rtprocess.h" /* Windows: must come first because of conflicts */ |
| 15 |
#include "glare.h" |
| 16 |
|
| 17 |
/* maximum rtrace buffer size */ |
| 18 |
#define MAXPIX (4096/(6*sizeof(float))) |
| 19 |
|
| 20 |
#define MAXSBUF 786432 /* maximum total size of scanline buffer */ |
| 21 |
#define HSIZE 317 /* size of scanline hash table */ |
| 22 |
#define NRETIRE 16 /* number of scanlines to retire at once */ |
| 23 |
|
| 24 |
static SUBPROC rt_pd = SP_INACTIVE; /* process id & descriptors for rtrace */ |
| 25 |
|
| 26 |
FILE *pictfp = NULL; /* picture file pointer */ |
| 27 |
double exposure; /* picture exposure */ |
| 28 |
int pxsiz, pysiz; /* picture dimensions */ |
| 29 |
|
| 30 |
static int curpos; /* current scanline */ |
| 31 |
static long *scanpos; /* scanline positions */ |
| 32 |
|
| 33 |
typedef struct scan { |
| 34 |
int y; /* scanline position */ |
| 35 |
long lused; /* for LRU replacement */ |
| 36 |
struct scan *next; /* next in this hash or free list */ |
| 37 |
/* followed by the scanline data */ |
| 38 |
} SCAN; /* buffered scanline */ |
| 39 |
|
| 40 |
#define scandata(sl) ((COLR *)((sl)+1)) |
| 41 |
#define shash(y) ((y)%HSIZE) |
| 42 |
|
| 43 |
static int maxpix; /* maximum number of pixels to buffer */ |
| 44 |
|
| 45 |
static SCAN *freelist; /* scanline free list */ |
| 46 |
static SCAN *hashtab[HSIZE]; /* scanline hash table */ |
| 47 |
|
| 48 |
static long scanbufsiz; /* size of allocated scanline buffer */ |
| 49 |
|
| 50 |
static long ncall = 0L; /* number of calls to getpictscan */ |
| 51 |
static long nread = 0L; /* number of scanlines read */ |
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static long nrecl = 0L; /* number of scanlines reclaimed */ |
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|
| 54 |
static int wrongformat = 0; |
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|
| 56 |
static SCAN * claimscan(int y); |
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static COLR * getpictscan(int y); |
| 58 |
static double pict_val(FVECT vd); |
| 59 |
static void rt_compute(float *pb, int np); |
| 60 |
static gethfunc getexpos; |
| 61 |
static SCAN * scanretire(void); |
| 62 |
static void initscans(void); |
| 63 |
static void donescans(void); |
| 64 |
|
| 65 |
|
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static SCAN * |
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claimscan( /* claim scanline from buffers */ |
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int y |
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) |
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{ |
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int hi = shash(y); |
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SCAN *slast; |
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SCAN *sl; |
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|
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for (sl = hashtab[hi]; sl != NULL; sl = sl->next) |
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if (sl->y == y) /* active scanline */ |
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return(sl); |
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for (slast = NULL, sl = freelist; sl != NULL; slast = sl, sl = sl->next) |
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if (sl->y == -1 || sl->y == y || sl->next == NULL) { |
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if (slast == NULL) /* remove from free */ |
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freelist = sl->next; |
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else |
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slast->next = sl->next; |
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if (sl->y == y) { /* reclaim */ |
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sl->next = hashtab[hi]; |
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hashtab[hi] = sl; |
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nrecl++; |
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} |
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return(sl); |
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} |
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return(scanretire()); /* need more free scanlines */ |
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} |
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|
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|
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static COLR * |
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getpictscan( /* get picture scanline */ |
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int y |
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) |
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{ |
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SCAN *sl; |
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int i; |
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/* first check our buffers */ |
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sl = claimscan(y); |
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if (sl == NULL) |
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memerr("claimscan()"); |
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sl->lused = ncall++; |
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if (sl->y == y) /* scan hit */ |
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return(scandata(sl)); |
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/* else read in replacement */ |
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if (scanpos[y] < 0) { /* need to search */ |
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for (i = y+1; i < curpos; i++) |
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if (scanpos[i] >= 0) { |
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if (fseek(pictfp, scanpos[i], 0) < 0) |
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goto seekerr; |
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curpos = i; |
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break; |
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} |
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while (curpos >= y) { |
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scanpos[curpos] = ftell(pictfp); |
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if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0) |
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goto readerr; |
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nread++; |
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curpos--; |
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} |
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} else { |
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if (curpos != y && fseek(pictfp, scanpos[y], 0) < 0) |
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goto seekerr; |
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if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0) |
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goto readerr; |
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nread++; |
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curpos = y-1; |
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} |
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sl->y = y; |
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i = shash(y); /* add to hash list */ |
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sl->next = hashtab[i]; |
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hashtab[i] = sl; |
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return(scandata(sl)); |
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readerr: |
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fprintf(stderr, "%s: picture read error\n", progname); |
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exit(1); |
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seekerr: |
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fprintf(stderr, "%s: picture seek error\n", progname); |
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exit(1); |
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} |
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|
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|
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#ifdef DEBUG |
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void |
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pict_stats(void) /* print out picture read statistics */ |
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{ |
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static long lastcall = 0L; /* ncall at last report */ |
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static long lastread = 0L; /* nread at last report */ |
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static long lastrecl = 0L; /* nrecl at last report */ |
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|
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if (ncall == lastcall) |
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return; |
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fprintf(stderr, "%s: %ld scanlines read (%ld reclaimed) in %ld calls\n", |
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progname, nread-lastread, nrecl-lastrecl, ncall-lastcall); |
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lastcall = ncall; |
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lastread = nread; |
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lastrecl = nrecl; |
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} |
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#endif |
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|
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|
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static double |
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pict_val( /* find picture value for view direction */ |
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FVECT vd |
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) |
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{ |
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FVECT pp; |
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FVECT ip; |
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COLOR res; |
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|
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if (pictfp == NULL) |
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return(-1.0); |
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pp[0] = pictview.vp[0] + vd[0]; |
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pp[1] = pictview.vp[1] + vd[1]; |
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pp[2] = pictview.vp[2] + vd[2]; |
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if (viewloc(ip, &pictview, pp) != VL_GOOD) |
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return(-1.0); |
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colr_color(res, getpictscan((int)(ip[1]*pysiz))[(int)(ip[0]*pxsiz)]); |
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return(luminance(res)/exposure); |
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} |
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|
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|
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double |
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getviewpix( /* compute single view pixel */ |
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int vh, |
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int vv |
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) |
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{ |
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FVECT dir; |
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float rt_buf[12]; |
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double res; |
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|
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if (compdir(dir, vh, vv) < 0) |
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return(-1.0); |
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npixinvw++; |
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if ((res = pict_val(dir)) >= 0.0) |
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return(res); |
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if (!(rt_pd.flags & PF_RUNNING)) { |
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npixmiss++; |
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return(-1.0); |
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} |
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rt_buf[0] = ourview.vp[0]; |
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rt_buf[1] = ourview.vp[1]; |
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rt_buf[2] = ourview.vp[2]; |
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rt_buf[3] = dir[0]; |
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rt_buf[4] = dir[1]; |
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rt_buf[5] = dir[2]; |
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rt_compute(rt_buf, 1); |
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return(luminance(rt_buf)); |
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} |
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|
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|
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void |
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getviewspan( /* compute a span of view pixels */ |
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int vv, |
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float *vb |
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) |
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{ |
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float rt_buf[6*MAXPIX]; /* rtrace send/receive buffer */ |
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int n; /* number of pixels in buffer */ |
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short buf_vh[MAXPIX]; /* pixel positions */ |
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FVECT dir; |
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int vh; |
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|
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#ifdef DEBUG |
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if (verbose) |
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fprintf(stderr, "%s: computing view span at %d...\n", |
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progname, vv); |
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#endif |
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n = 0; |
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for (vh = -hsize; vh <= hsize; vh++) { |
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if (compdir(dir, vh, vv) < 0) { /* not in view */ |
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vb[vh+hsize] = -1.0; |
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continue; |
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} |
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npixinvw++; |
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if ((vb[vh+hsize] = pict_val(dir)) >= 0.0) |
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continue; |
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if (!(rt_pd.flags & PF_RUNNING)) { /* missing information */ |
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npixmiss++; |
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continue; |
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} |
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/* send to rtrace */ |
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if (n >= maxpix) { /* flush */ |
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rt_compute(rt_buf, n); |
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while (n > 0) { |
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--n; |
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vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n); |
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} |
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} |
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rt_buf[6*n] = ourview.vp[0]; |
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rt_buf[6*n+1] = ourview.vp[1]; |
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rt_buf[6*n+2] = ourview.vp[2]; |
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rt_buf[6*n+3] = dir[0]; |
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rt_buf[6*n+4] = dir[1]; |
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rt_buf[6*n+5] = dir[2]; |
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buf_vh[n++] = vh; |
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} |
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#ifdef DEBUG |
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if (verbose) |
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pict_stats(); |
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#endif |
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if (n > 0) { /* process pending buffer */ |
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rt_compute(rt_buf, n); |
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while (n-- > 0) |
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vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n); |
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} |
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} |
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|
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|
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static void |
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rt_compute( /* process buffer through rtrace */ |
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float *pb, |
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int np |
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) |
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{ |
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#ifdef DEBUG |
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if (verbose && np > 1) |
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fprintf(stderr, "%s: sending %d samples to rtrace...\n", |
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progname, np); |
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#endif |
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memset(pb+6*np, '\0', 6*sizeof(float)); |
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if (process(&rt_pd, (char *)pb, (char *)pb, 3*sizeof(float)*(np+1), |
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6*sizeof(float)*(np+1)) < 3*sizeof(float)*(np+1)) { |
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fprintf(stderr, "%s: rtrace communication error\n", |
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progname); |
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exit(1); |
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} |
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} |
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|
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|
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static int |
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getexpos( /* get exposure from header line */ |
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char *s, |
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void *p |
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) |
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{ |
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char fmt[MAXFMTLEN]; |
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|
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if (isexpos(s)) |
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exposure *= exposval(s); |
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else if (isformat(s)) { |
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formatval(fmt, s); |
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wrongformat = strcmp(fmt, COLRFMT); |
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} |
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return(0); |
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} |
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|
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|
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void |
| 315 |
open_pict( /* open picture file */ |
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char *fn |
| 317 |
) |
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{ |
| 319 |
if ((pictfp = fopen(fn, "r")) == NULL) { |
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fprintf(stderr, "%s: cannot open\n", fn); |
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exit(1); |
| 322 |
} |
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SET_FILE_BINARY(pictfp); |
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exposure = 1.0; |
| 325 |
getheader(pictfp, getexpos, NULL); |
| 326 |
if (wrongformat || !fscnresolu(&pxsiz, &pysiz, pictfp)) { |
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fprintf(stderr, "%s: incompatible picture format\n", fn); |
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exit(1); |
| 329 |
} |
| 330 |
initscans(); |
| 331 |
} |
| 332 |
|
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|
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void |
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close_pict(void) /* done with picture */ |
| 336 |
{ |
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if (pictfp == NULL) |
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return; |
| 339 |
fclose(pictfp); |
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donescans(); |
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pictfp = NULL; |
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} |
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|
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|
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void |
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fork_rtrace( /* open pipe and start rtrace */ |
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char *av[] |
| 348 |
) |
| 349 |
{ |
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int rval; |
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|
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rval = open_process(&rt_pd, av); |
| 353 |
if (rval < 0) { |
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perror(progname); |
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exit(1); |
| 356 |
} |
| 357 |
if (rval == 0) { |
| 358 |
fprintf(stderr, "%s: command not found\n", av[0]); |
| 359 |
exit(1); |
| 360 |
} |
| 361 |
maxpix = rval/(6*sizeof(float)); |
| 362 |
if (maxpix > MAXPIX) |
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maxpix = MAXPIX; |
| 364 |
maxpix--; |
| 365 |
} |
| 366 |
|
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|
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void |
| 369 |
done_rtrace(void) /* wait for rtrace to finish */ |
| 370 |
{ |
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int status; |
| 372 |
|
| 373 |
status = close_process(&rt_pd); |
| 374 |
if (status > 0) { |
| 375 |
fprintf(stderr, "%s: bad status (%d) from rtrace\n", |
| 376 |
progname, status); |
| 377 |
exit(1); |
| 378 |
} |
| 379 |
} |
| 380 |
|
| 381 |
|
| 382 |
static SCAN * |
| 383 |
scanretire(void) /* retire old scanlines to free list */ |
| 384 |
{ |
| 385 |
SCAN *sold[NRETIRE]; |
| 386 |
int n; |
| 387 |
int h; |
| 388 |
SCAN *sl; |
| 389 |
int i; |
| 390 |
/* grab the NRETIRE oldest scanlines */ |
| 391 |
sold[n = 0] = NULL; |
| 392 |
for (h = 0; h < HSIZE; h++) |
| 393 |
for (sl = hashtab[h]; sl != NULL; sl = sl->next) { |
| 394 |
for (i = n; i && sold[i-1]->lused > sl->lused; i--) |
| 395 |
if (i < NRETIRE) |
| 396 |
sold[i] = sold[i-1]; |
| 397 |
if (i < NRETIRE) { |
| 398 |
sold[i] = sl; |
| 399 |
if (n < NRETIRE) /* grow list */ |
| 400 |
n++; |
| 401 |
} |
| 402 |
} |
| 403 |
/* put scanlines into free list */ |
| 404 |
for (i = 0; i < n; i++) { |
| 405 |
h = shash(sold[i]->y); |
| 406 |
sl = hashtab[h]; |
| 407 |
if (sl == sold[i]) |
| 408 |
hashtab[h] = sl->next; |
| 409 |
else { |
| 410 |
while (sl->next != sold[i]) /* IS in list */ |
| 411 |
sl = sl->next; |
| 412 |
sl->next = sold[i]->next; |
| 413 |
} |
| 414 |
if (i > 0) { /* save oldest as return value */ |
| 415 |
sold[i]->next = freelist; |
| 416 |
freelist = sold[i]; |
| 417 |
} |
| 418 |
} |
| 419 |
return(sold[0]); |
| 420 |
} |
| 421 |
|
| 422 |
|
| 423 |
static char *scan_buf; |
| 424 |
|
| 425 |
|
| 426 |
static void |
| 427 |
initscans(void) /* initialize scanline buffers */ |
| 428 |
{ |
| 429 |
int scansize; |
| 430 |
SCAN *ptr; |
| 431 |
int i; |
| 432 |
/* initialize positions */ |
| 433 |
scanpos = (long *)bmalloc(pysiz*sizeof(long)); |
| 434 |
if (scanpos == NULL) |
| 435 |
memerr("scanline positions"); |
| 436 |
for (i = pysiz-1; i >= 0; i--) |
| 437 |
scanpos[i] = -1L; |
| 438 |
curpos = pysiz-1; |
| 439 |
/* clear hash table */ |
| 440 |
for (i = 0; i < HSIZE; i++) |
| 441 |
hashtab[i] = NULL; |
| 442 |
/* allocate scanline buffers */ |
| 443 |
scansize = sizeof(SCAN) + pxsiz*sizeof(COLR); |
| 444 |
#ifdef ALIGNT |
| 445 |
scansize = scansize+(sizeof(ALIGNT)-1) & ~(sizeof(ALIGNT)-1); |
| 446 |
#endif |
| 447 |
i = MAXSBUF / scansize; /* compute number to allocate */ |
| 448 |
if (i > HSIZE) |
| 449 |
i = HSIZE; |
| 450 |
scanbufsiz = i*scansize; |
| 451 |
scan_buf = bmalloc(scanbufsiz); /* get in one big chunk */ |
| 452 |
if (scan_buf == NULL) |
| 453 |
memerr("scanline buffers"); |
| 454 |
ptr = (SCAN *)scan_buf; |
| 455 |
freelist = NULL; /* build our free list */ |
| 456 |
while (i-- > 0) { |
| 457 |
ptr->y = -1; |
| 458 |
ptr->lused = -1; |
| 459 |
ptr->next = freelist; |
| 460 |
freelist = ptr; |
| 461 |
ptr = (SCAN *)((char *)ptr + scansize); /* beware of C bugs */ |
| 462 |
} |
| 463 |
} |
| 464 |
|
| 465 |
|
| 466 |
static void |
| 467 |
donescans(void) /* free up scanlines */ |
| 468 |
{ |
| 469 |
bfree(scan_buf, scanbufsiz); |
| 470 |
bfree((char *)scanpos, pysiz*sizeof(long)); |
| 471 |
} |
