src/util/glareval.c

#ifndef lint
static const char       RCSid[] = "$Id: glareval.c,v 2.10 2003/07/03 22:41:45 schorsch Exp $";
#endif
/*
 * Compute pixels for glare calculation
 */

#include "copyright.h"

#include <stdlib.h>
#include <string.h>

#include "rtprocess.h" /* Windows: must come first because of conflicts */
#include "glare.h"

                                        /* maximum rtrace buffer size */
#define MAXPIX          (4096/(6*sizeof(float)))

#define MAXSBUF         786432  /* maximum total size of scanline buffer */
#define HSIZE           317     /* size of scanline hash table */
#define NRETIRE         16      /* number of scanlines to retire at once */

static SUBPROC  rt_pd = SP_INACTIVE; /* process id & descriptors for rtrace */

FILE    *pictfp = NULL;         /* picture file pointer */
double  exposure;               /* picture exposure */
int     pxsiz, pysiz;           /* picture dimensions */

static int      curpos;         /* current scanline */
static long     *scanpos;       /* scanline positions */

typedef struct scan {
        int     y;              /* scanline position */
        long    lused;          /* for LRU replacement */
        struct scan     *next;  /* next in this hash or free list */
        /* followed by the scanline data */
} SCAN;                 /* buffered scanline */

#define scandata(sl)    ((COLR *)((sl)+1))
#define shash(y)        ((y)%HSIZE)

static int      maxpix;         /* maximum number of pixels to buffer */

static SCAN     *freelist;              /* scanline free list */
static SCAN     *hashtab[HSIZE];        /* scanline hash table */

static long     scanbufsiz;             /* size of allocated scanline buffer */

static long     ncall = 0L;     /* number of calls to getpictscan */
static long     nread = 0L;     /* number of scanlines read */
static long     nrecl = 0L;     /* number of scanlines reclaimed */

static int      wrongformat = 0;

static SCAN * claimscan(int     y); 
static COLR * getpictscan(int   y);
static double pict_val(FVECT    vd);
static void rt_compute(float    *pb, int        np);
static gethfunc getexpos;
static SCAN * scanretire(void);
static void initscans(void);
static void donescans(void);


static SCAN *
claimscan(                      /* claim scanline from buffers */
        int     y
)
{
        int     hi = shash(y);
        SCAN    *slast;
        register SCAN   *sl;

        for (sl = hashtab[hi]; sl != NULL; sl = sl->next)
                if (sl->y == y)                         /* active scanline */
                        return(sl);
        for (slast = NULL, sl = freelist; sl != NULL; slast = sl, sl = sl->next)
                if (sl->y == -1 || sl->y == y || sl->next == NULL) {
                        if (slast == NULL)              /* remove from free */
                                freelist = sl->next;
                        else
                                slast->next = sl->next;
                        if (sl->y == y) {               /* reclaim */
                                sl->next = hashtab[hi];
                                hashtab[hi] = sl;
                                nrecl++;
                        }
                        return(sl);
                }
        return(scanretire());           /* need more free scanlines */
}


static COLR *
getpictscan(                    /* get picture scanline */
        int     y
)
{
        register SCAN   *sl;
        register int    i;
                                        /* first check our buffers */
        sl = claimscan(y);
        if (sl == NULL)
                memerr("claimscan()");
        sl->lused = ncall++;
        if (sl->y == y)                 /* scan hit */
                return(scandata(sl));
                                        /* else read in replacement */
        if (scanpos[y] < 0) {                   /* need to search */
                for (i = y+1; i < curpos; i++)
                        if (scanpos[i] >= 0) {
                                if (fseek(pictfp, scanpos[i], 0) < 0)
                                        goto seekerr;
                                curpos = i;
                                break;
                        }
                while (curpos >= y) {
                        scanpos[curpos] = ftell(pictfp);
                        if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0)
                                goto readerr;
                        nread++;
                        curpos--;
                }
        } else {
                if (curpos != y && fseek(pictfp, scanpos[y], 0) < 0)
                        goto seekerr;
                if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0)
                        goto readerr;
                nread++;
                curpos = y-1;
        }
        sl->y = y;
        i = shash(y);                   /* add to hash list */
        sl->next = hashtab[i];
        hashtab[i] = sl;
        return(scandata(sl));
readerr:
        fprintf(stderr, "%s: picture read error\n", progname);
        exit(1);
seekerr:
        fprintf(stderr, "%s: picture seek error\n", progname);
        exit(1);
}


#ifdef DEBUG
static void
pict_stats(void)                        /* print out picture read statistics */
{
        static long     lastcall = 0L;  /* ncall at last report */
        static long     lastread = 0L;  /* nread at last report */
        static long     lastrecl = 0L;  /* nrecl at last report */

        if (ncall == lastcall)
                return;
        fprintf(stderr, "%s: %ld scanlines read (%ld reclaimed) in %ld calls\n",
                progname, nread-lastread, nrecl-lastrecl, ncall-lastcall);
        lastcall = ncall;
        lastread = nread;
        lastrecl = nrecl;
}
#endif


static double
pict_val(                       /* find picture value for view direction */
        FVECT   vd
)
{
        FVECT   pp;
        FVECT   ip;
        COLOR   res;

        if (pictfp == NULL)
                return(-1.0);
        pp[0] = pictview.vp[0] + vd[0];
        pp[1] = pictview.vp[1] + vd[1];
        pp[2] = pictview.vp[2] + vd[2];
        viewloc(ip, &pictview, pp);
        if (ip[2] <= FTINY || ip[0] < 0. || ip[0] >= 1. ||
                        ip[1] < 0. || ip[1] >= 1.)
                return(-1.0);
        colr_color(res, getpictscan((int)(ip[1]*pysiz))[(int)(ip[0]*pxsiz)]);
        return(luminance(res)/exposure);
}


extern double
getviewpix(             /* compute single view pixel */
        int     vh,
        int     vv
)
{
        FVECT   dir;
        float   rt_buf[12];
        double  res;

        if (compdir(dir, vh, vv) < 0)
                return(-1.0);
        npixinvw++;
        if ((res = pict_val(dir)) >= 0.0)
                return(res);
        if (rt_pd.r == -1) {
                npixmiss++;
                return(-1.0);
        }
        rt_buf[0] = ourview.vp[0];
        rt_buf[1] = ourview.vp[1];
        rt_buf[2] = ourview.vp[2];
        rt_buf[3] = dir[0];
        rt_buf[4] = dir[1];
        rt_buf[5] = dir[2];
        rt_compute(rt_buf, 1);
        return(luminance(rt_buf));
}


extern void
getviewspan(            /* compute a span of view pixels */
        int     vv,
        float   *vb
)
{
        float   rt_buf[6*MAXPIX];       /* rtrace send/receive buffer */
        register int    n;              /* number of pixels in buffer */
        short   buf_vh[MAXPIX];         /* pixel positions */
        FVECT   dir;
        register int    vh;

#ifdef DEBUG
        if (verbose)
                fprintf(stderr, "%s: computing view span at %d...\n",
                                progname, vv);
#endif
        n = 0;
        for (vh = -hsize; vh <= hsize; vh++) {
                if (compdir(dir, vh, vv) < 0) {         /* not in view */
                        vb[vh+hsize] = -1.0;
                        continue;
                }
                npixinvw++;
                if ((vb[vh+hsize] = pict_val(dir)) >= 0.0)
                        continue;
                if (rt_pd.r == -1) {            /* missing information */
                        npixmiss++;
                        continue;
                }
                                                /* send to rtrace */
                if (n >= maxpix) {                      /* flush */
                        rt_compute(rt_buf, n);
                        while (n-- > 0)
                                vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n);
                }
                rt_buf[6*n] = ourview.vp[0];
                rt_buf[6*n+1] = ourview.vp[1];
                rt_buf[6*n+2] = ourview.vp[2];
                rt_buf[6*n+3] = dir[0];
                rt_buf[6*n+4] = dir[1];
                rt_buf[6*n+5] = dir[2];
                buf_vh[n++] = vh;
        }
#ifdef DEBUG
        if (verbose)
                pict_stats();
#endif
        if (n > 0) {                            /* process pending buffer */
                rt_compute(rt_buf, n);
                while (n-- > 0)
                        vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n);
        }
}


static void
rt_compute(             /* process buffer through rtrace */
        float   *pb,
        int     np
)
{
#ifdef DEBUG
        if (verbose && np > 1)
                fprintf(stderr, "%s: sending %d samples to rtrace...\n",
                                progname, np);
#endif
        memset(pb+6*np, '\0', 6*sizeof(float));
        if (process(&rt_pd, (char *)pb, (char *)pb, 3*sizeof(float)*(np+1),
                        6*sizeof(float)*(np+1)) < 3*sizeof(float)*(np+1)) {
                fprintf(stderr, "%s: rtrace communication error\n",
                                progname);
                exit(1);
        }
}


static int
getexpos(                       /* get exposure from header line */
        char    *s,
        void    *p
)
{
        char    fmt[32];

        if (isexpos(s))
                exposure *= exposval(s);
        else if (isformat(s)) {
                formatval(fmt, s);
                wrongformat = strcmp(fmt, COLRFMT);
        }
        return(0);
}


extern void
open_pict(                      /* open picture file */
        char    *fn
)
{
        if ((pictfp = fopen(fn, "r")) == NULL) {
                fprintf(stderr, "%s: cannot open\n", fn);
                exit(1);
        }
        exposure = 1.0;
        getheader(pictfp, getexpos, NULL);
        if (wrongformat || !fscnresolu(&pxsiz, &pysiz, pictfp)) {
                fprintf(stderr, "%s: incompatible picture format\n", fn);
                exit(1);
        }
        initscans();
}


extern void
close_pict(void)                        /* done with picture */
{
        if (pictfp == NULL)
                return;
        fclose(pictfp);
        donescans();
        pictfp = NULL;
}


extern void
fork_rtrace(                    /* open pipe and start rtrace */
        char    *av[]
)
{
        int     rval;

        rval = open_process(&rt_pd, av);
        if (rval < 0) {
                perror(progname);
                exit(1);
        }
        if (rval == 0) {
                fprintf(stderr, "%s: command not found\n", av[0]);
                exit(1);
        }
        maxpix = rval/(6*sizeof(float));
        if (maxpix > MAXPIX)
                maxpix = MAXPIX;
        maxpix--;
}


extern void
done_rtrace(void)                       /* wait for rtrace to finish */
{
        int     status;

        status = close_process(&rt_pd);
        if (status > 0) {
                fprintf(stderr, "%s: bad status (%d) from rtrace\n",
                                progname, status);
                exit(1);
        }
        rt_pd.r = -1;
}


static SCAN *
scanretire(void)                        /* retire old scanlines to free list */
{
        SCAN    *sold[NRETIRE];
        int     n;
        int     h;
        register SCAN   *sl;
        register int    i;
                                        /* grab the NRETIRE oldest scanlines */
        sold[n = 0] = NULL;
        for (h = 0; h < HSIZE; h++)
                for (sl = hashtab[h]; sl != NULL; sl = sl->next) {
                        for (i = n; i && sold[i-1]->lused > sl->lused; i--)
                                if (i < NRETIRE)
                                        sold[i] = sold[i-1];
                        if (i < NRETIRE) {
                                sold[i] = sl;
                                if (n < NRETIRE)        /* grow list */
                                        n++;
                        }
                }
                                        /* put scanlines into free list */
        for (i = 0; i < n; i++) {
                h = shash(sold[i]->y);
                sl = hashtab[h];
                if (sl == sold[i])
                        hashtab[h] = sl->next;
                else {
                        while (sl->next != sold[i])     /* IS in list */
                                sl = sl->next;
                        sl->next = sold[i]->next;
                }
                if (i > 0) {            /* save oldest as return value */
                        sold[i]->next = freelist;
                        freelist = sold[i];
                }
        }
        return(sold[0]);
}


static char     *scan_buf;


static void
initscans(void)                         /* initialize scanline buffers */
{
        int     scansize;
        register SCAN   *ptr;
        register int    i;
                                        /* initialize positions */
        scanpos = (long *)bmalloc(pysiz*sizeof(long));
        if (scanpos == NULL)
                memerr("scanline positions");
        for (i = pysiz-1; i >= 0; i--)
                scanpos[i] = -1L;
        curpos = pysiz-1;
                                        /* clear hash table */
        for (i = 0; i < HSIZE; i++)
                hashtab[i] = NULL;
                                        /* allocate scanline buffers */
        scansize = sizeof(SCAN) + pxsiz*sizeof(COLR);
#ifdef ALIGNT
        scansize = scansize+(sizeof(ALIGNT)-1) & ~(sizeof(ALIGNT)-1);
#endif
        i = MAXSBUF / scansize;         /* compute number to allocate */
        if (i > HSIZE)
                i = HSIZE;
        scanbufsiz = i*scansize;
        scan_buf = bmalloc(scanbufsiz); /* get in one big chunk */
        if (scan_buf == NULL)
                memerr("scanline buffers");
        ptr = (SCAN *)scan_buf;
        freelist = NULL;                /* build our free list */
        while (i-- > 0) {
                ptr->y = -1;
                ptr->lused = -1;
                ptr->next = freelist;
                freelist = ptr;
                ptr = (SCAN *)((char *)ptr + scansize); /* beware of C bugs */
        }
}


static void
donescans(void)                         /* free up scanlines */
{
        bfree(scan_buf, scanbufsiz);
        bfree((char *)scanpos, pysiz*sizeof(long));
}
Revision:	2.11
Committed:	Fri Jan 2 12:48:36 2004 UTC (20 years, 3 months ago) by schorsch
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad3R7P2, rad3R7P1, rad3R6, rad3R6P1
Changes since 2.10:	+61 -36 lines
Log Message:	Ansification and fixed typing/prototype of getheader() and its callback.
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	schorsch	2.11	static const char RCSid[] = "$Id: glareval.c,v 2.10 2003/07/03 22:41:45 schorsch Exp $";
3	greg	1.1	#endif
4			/*
5			* Compute pixels for glare calculation
6			*/
7
8	schorsch	2.9	#include "copyright.h"
9
10	schorsch	2.10	#include <stdlib.h>
11	schorsch	2.9	#include <string.h>
12
13	schorsch	2.7	#include "rtprocess.h" /* Windows: must come first because of conflicts */
14	greg	1.1	#include "glare.h"
15	schorsch	2.7
16	greg	1.19	/* maximum rtrace buffer size */
17			#define MAXPIX (4096/(6*sizeof(float)))
18	greg	1.1
19	greg	1.16	#define MAXSBUF 786432 /* maximum total size of scanline buffer */
20	greg	1.9	#define HSIZE 317 /* size of scanline hash table */
21	greg	1.8	#define NRETIRE 16 /* number of scanlines to retire at once */
22	greg	1.1
23	schorsch	2.7	static SUBPROC rt_pd = SP_INACTIVE; /* process id & descriptors for rtrace */
24	greg	1.1
25			FILE pictfp = NULL; / picture file pointer */
26			double exposure; /* picture exposure */
27			int pxsiz, pysiz; /* picture dimensions */
28	greg	1.8
29			static int curpos; /* current scanline */
30			static long scanpos; / scanline positions */
31
32			typedef struct scan {
33			int y; /* scanline position */
34	greg	1.1	long lused; /* for LRU replacement */
35	greg	1.8	struct scan next; / next in this hash or free list */
36			/* followed by the scanline data */
37			} SCAN; /* buffered scanline */
38	greg	1.1
39	greg	1.8	#define scandata(sl) ((COLR *)((sl)+1))
40			#define shash(y) ((y)%HSIZE)
41
42	greg	1.19	static int maxpix; /* maximum number of pixels to buffer */
43
44	greg	1.8	static SCAN freelist; / scanline free list */
45			static SCAN hashtab[HSIZE]; / scanline hash table */
46
47	greg	2.2	static long scanbufsiz; /* size of allocated scanline buffer */
48
49	greg	1.2	static long ncall = 0L; /* number of calls to getpictscan */
50			static long nread = 0L; /* number of scanlines read */
51	greg	1.15	static long nrecl = 0L; /* number of scanlines reclaimed */
52	greg	1.1
53	greg	1.13	static int wrongformat = 0;
54
55	schorsch	2.11	static SCAN * claimscan(int y);
56			static COLR * getpictscan(int y);
57			static double pict_val(FVECT vd);
58			static void rt_compute(float *pb, int np);
59			static gethfunc getexpos;
60			static SCAN * scanretire(void);
61			static void initscans(void);
62			static void donescans(void);
63	greg	1.8
64	greg	1.2
65	schorsch	2.11	static SCAN *
66			claimscan( /* claim scanline from buffers */
67			int y
68			)
69	greg	1.8	{
70			int hi = shash(y);
71			SCAN *slast;
72			register SCAN *sl;
73
74			for (sl = hashtab[hi]; sl != NULL; sl = sl->next)
75			if (sl->y == y) /* active scanline */
76			return(sl);
77			for (slast = NULL, sl = freelist; sl != NULL; slast = sl, sl = sl->next)
78			if (sl->y == -1 \|\| sl->y == y \|\| sl->next == NULL) {
79			if (slast == NULL) /* remove from free */
80			freelist = sl->next;
81			else
82			slast->next = sl->next;
83			if (sl->y == y) { /* reclaim */
84			sl->next = hashtab[hi];
85			hashtab[hi] = sl;
86	greg	1.15	nrecl++;
87	greg	1.8	}
88			return(sl);
89			}
90			return(scanretire()); /* need more free scanlines */
91			}
92
93
94	schorsch	2.11	static COLR *
95			getpictscan( /* get picture scanline */
96			int y
97			)
98	greg	1.1	{
99	greg	1.8	register SCAN *sl;
100	greg	1.1	register int i;
101			/* first check our buffers */
102	greg	1.8	sl = claimscan(y);
103			if (sl == NULL)
104			memerr("claimscan()");
105			sl->lused = ncall++;
106			if (sl->y == y) /* scan hit */
107			return(scandata(sl));
108			/* else read in replacement */
109	greg	1.5	if (scanpos[y] < 0) { /* need to search */
110			for (i = y+1; i < curpos; i++)
111			if (scanpos[i] >= 0) {
112			if (fseek(pictfp, scanpos[i], 0) < 0)
113			goto seekerr;
114			curpos = i;
115			break;
116			}
117			while (curpos >= y) {
118	greg	1.1	scanpos[curpos] = ftell(pictfp);
119	greg	1.8	if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0)
120	greg	1.1	goto readerr;
121	greg	1.5	nread++;
122	greg	1.1	curpos--;
123			}
124	greg	1.5	} else {
125			if (curpos != y && fseek(pictfp, scanpos[y], 0) < 0)
126			goto seekerr;
127	greg	1.8	if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0)
128	greg	1.5	goto readerr;
129			nread++;
130			curpos = y-1;
131	greg	1.1	}
132	greg	1.8	sl->y = y;
133			i = shash(y); /* add to hash list */
134			sl->next = hashtab[i];
135			hashtab[i] = sl;
136			return(scandata(sl));
137	greg	1.1	readerr:
138			fprintf(stderr, "%s: picture read error\n", progname);
139			exit(1);
140	greg	1.5	seekerr:
141			fprintf(stderr, "%s: picture seek error\n", progname);
142			exit(1);
143	greg	1.1	}
144
145
146	greg	1.6	#ifdef DEBUG
147	schorsch	2.11	static void
148			pict_stats(void) /* print out picture read statistics */
149	greg	1.2	{
150			static long lastcall = 0L; /* ncall at last report */
151			static long lastread = 0L; /* nread at last report */
152	greg	1.15	static long lastrecl = 0L; /* nrecl at last report */
153	greg	1.2
154			if (ncall == lastcall)
155			return;
156	greg	1.15	fprintf(stderr, "%s: %ld scanlines read (%ld reclaimed) in %ld calls\n",
157			progname, nread-lastread, nrecl-lastrecl, ncall-lastcall);
158	greg	1.2	lastcall = ncall;
159			lastread = nread;
160	greg	1.15	lastrecl = nrecl;
161	greg	1.2	}
162	greg	1.6	#endif
163	greg	1.2
164
165	schorsch	2.11	static double
166			pict_val( /* find picture value for view direction */
167			FVECT vd
168			)
169	greg	1.1	{
170			FVECT pp;
171	greg	1.21	FVECT ip;
172	greg	1.1	COLOR res;
173
174			if (pictfp == NULL)
175			return(-1.0);
176			pp[0] = pictview.vp[0] + vd[0];
177			pp[1] = pictview.vp[1] + vd[1];
178			pp[2] = pictview.vp[2] + vd[2];
179	greg	1.21	viewloc(ip, &pictview, pp);
180			if (ip[2] <= FTINY \|\| ip[0] < 0. \|\| ip[0] >= 1. \|\|
181			ip[1] < 0. \|\| ip[1] >= 1.)
182	greg	1.1	return(-1.0);
183	greg	1.21	colr_color(res, getpictscan((int)(ip[1]pysiz))[(int)(ip[0]pxsiz)]);
184	greg	1.1	return(luminance(res)/exposure);
185			}
186
187
188	schorsch	2.11	extern double
189			getviewpix( /* compute single view pixel */
190			int vh,
191			int vv
192			)
193	greg	1.1	{
194			FVECT dir;
195	greg	1.19	float rt_buf[12];
196	greg	1.1	double res;
197
198	greg	1.14	if (compdir(dir, vh, vv) < 0)
199	greg	1.1	return(-1.0);
200	greg	1.7	npixinvw++;
201	greg	1.1	if ((res = pict_val(dir)) >= 0.0)
202			return(res);
203	schorsch	2.7	if (rt_pd.r == -1) {
204	greg	1.7	npixmiss++;
205	greg	1.1	return(-1.0);
206	greg	1.7	}
207	greg	1.1	rt_buf[0] = ourview.vp[0];
208			rt_buf[1] = ourview.vp[1];
209			rt_buf[2] = ourview.vp[2];
210			rt_buf[3] = dir[0];
211			rt_buf[4] = dir[1];
212			rt_buf[5] = dir[2];
213			rt_compute(rt_buf, 1);
214			return(luminance(rt_buf));
215			}
216
217
218	schorsch	2.11	extern void
219			getviewspan( /* compute a span of view pixels */
220			int vv,
221			float *vb
222			)
223	greg	1.1	{
224			float rt_buf[6MAXPIX]; / rtrace send/receive buffer */
225	greg	1.3	register int n; /* number of pixels in buffer */
226	greg	1.1	short buf_vh[MAXPIX]; /* pixel positions */
227			FVECT dir;
228			register int vh;
229
230	greg	1.4	#ifdef DEBUG
231	greg	1.1	if (verbose)
232			fprintf(stderr, "%s: computing view span at %d...\n",
233			progname, vv);
234	greg	1.4	#endif
235	greg	1.3	n = 0;
236	greg	1.1	for (vh = -hsize; vh <= hsize; vh++) {
237	greg	1.14	if (compdir(dir, vh, vv) < 0) { /* not in view */
238	greg	1.1	vb[vh+hsize] = -1.0;
239			continue;
240			}
241	greg	1.7	npixinvw++;
242	greg	1.1	if ((vb[vh+hsize] = pict_val(dir)) >= 0.0)
243			continue;
244	schorsch	2.7	if (rt_pd.r == -1) { /* missing information */
245	greg	1.7	npixmiss++;
246	greg	1.1	continue;
247	greg	1.7	}
248	greg	1.1	/* send to rtrace */
249	greg	1.19	if (n >= maxpix) { /* flush */
250	greg	1.3	rt_compute(rt_buf, n);
251			while (n-- > 0)
252			vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n);
253	greg	1.1	}
254	greg	1.3	rt_buf[6*n] = ourview.vp[0];
255			rt_buf[6*n+1] = ourview.vp[1];
256			rt_buf[6*n+2] = ourview.vp[2];
257			rt_buf[6*n+3] = dir[0];
258			rt_buf[6*n+4] = dir[1];
259			rt_buf[6*n+5] = dir[2];
260			buf_vh[n++] = vh;
261	greg	1.1	}
262	greg	1.4	#ifdef DEBUG
263	greg	1.2	if (verbose)
264			pict_stats();
265	greg	1.4	#endif
266	greg	1.3	if (n > 0) { /* process pending buffer */
267			rt_compute(rt_buf, n);
268			while (n-- > 0)
269			vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n);
270			}
271	greg	1.1	}
272
273
274	schorsch	2.11	static void
275			rt_compute( /* process buffer through rtrace */
276			float *pb,
277			int np
278			)
279	greg	1.1	{
280	greg	1.4	#ifdef DEBUG
281	greg	1.1	if (verbose && np > 1)
282			fprintf(stderr, "%s: sending %d samples to rtrace...\n",
283			progname, np);
284	greg	1.4	#endif
285	schorsch	2.9	memset(pb+6np, '\0', 6sizeof(float));
286	schorsch	2.7	if (process(&rt_pd, (char )pb, (char )pb, 3sizeof(float)(np+1),
287	gregl	2.4	6sizeof(float)(np+1)) < 3sizeof(float)(np+1)) {
288	greg	1.19	fprintf(stderr, "%s: rtrace communication error\n",
289	greg	1.1	progname);
290			exit(1);
291			}
292			}
293
294
295	schorsch	2.11	static int
296			getexpos( /* get exposure from header line */
297			char *s,
298			void *p
299			)
300	greg	1.1	{
301	greg	1.13	char fmt[32];
302
303	greg	1.1	if (isexpos(s))
304			exposure *= exposval(s);
305	greg	1.13	else if (isformat(s)) {
306			formatval(fmt, s);
307			wrongformat = strcmp(fmt, COLRFMT);
308			}
309	gwlarson	2.5	return(0);
310	greg	1.1	}
311
312
313	schorsch	2.11	extern void
314			open_pict( /* open picture file */
315			char *fn
316			)
317	greg	1.1	{
318			if ((pictfp = fopen(fn, "r")) == NULL) {
319	greg	2.3	fprintf(stderr, "%s: cannot open\n", fn);
320	greg	1.1	exit(1);
321			}
322			exposure = 1.0;
323	greg	1.13	getheader(pictfp, getexpos, NULL);
324	greg	1.21	if (wrongformat \|\| !fscnresolu(&pxsiz, &pysiz, pictfp)) {
325			fprintf(stderr, "%s: incompatible picture format\n", fn);
326	greg	1.1	exit(1);
327			}
328	greg	1.8	initscans();
329	greg	1.1	}
330
331
332	schorsch	2.11	extern void
333			close_pict(void) /* done with picture */
334	greg	1.1	{
335			if (pictfp == NULL)
336			return;
337			fclose(pictfp);
338	greg	1.8	donescans();
339	greg	1.1	pictfp = NULL;
340			}
341
342
343	schorsch	2.11	extern void
344			fork_rtrace( /* open pipe and start rtrace */
345			char *av[]
346			)
347	greg	1.1	{
348	greg	1.19	int rval;
349	greg	1.1
350	schorsch	2.7	rval = open_process(&rt_pd, av);
351	greg	1.19	if (rval < 0) {
352	greg	1.1	perror(progname);
353			exit(1);
354			}
355	greg	1.19	if (rval == 0) {
356			fprintf(stderr, "%s: command not found\n", av[0]);
357	greg	1.1	exit(1);
358			}
359	greg	1.19	maxpix = rval/(6*sizeof(float));
360			if (maxpix > MAXPIX)
361			maxpix = MAXPIX;
362			maxpix--;
363	greg	1.1	}
364
365
366	schorsch	2.11	extern void
367			done_rtrace(void) /* wait for rtrace to finish */
368	greg	1.1	{
369	greg	1.19	int status;
370	greg	1.1
371	schorsch	2.7	status = close_process(&rt_pd);
372	greg	1.19	if (status > 0) {
373	greg	1.1	fprintf(stderr, "%s: bad status (%d) from rtrace\n",
374			progname, status);
375			exit(1);
376			}
377	schorsch	2.7	rt_pd.r = -1;
378	greg	1.8	}
379
380
381	schorsch	2.11	static SCAN *
382			scanretire(void) /* retire old scanlines to free list */
383	greg	1.8	{
384			SCAN *sold[NRETIRE];
385			int n;
386			int h;
387			register SCAN *sl;
388			register int i;
389			/* grab the NRETIRE oldest scanlines */
390			sold[n = 0] = NULL;
391	greg	1.10	for (h = 0; h < HSIZE; h++)
392			for (sl = hashtab[h]; sl != NULL; sl = sl->next) {
393			for (i = n; i && sold[i-1]->lused > sl->lused; i--)
394			if (i < NRETIRE)
395	greg	1.8	sold[i] = sold[i-1];
396			if (i < NRETIRE) {
397	greg	1.10	sold[i] = sl;
398	greg	1.8	if (n < NRETIRE) /* grow list */
399			n++;
400	greg	1.10	}
401			}
402			/* put scanlines into free list */
403			for (i = 0; i < n; i++) {
404			h = shash(sold[i]->y);
405			sl = hashtab[h];
406			if (sl == sold[i])
407			hashtab[h] = sl->next;
408			else {
409			while (sl->next != sold[i]) /* IS in list */
410	greg	1.8	sl = sl->next;
411	greg	1.10	sl->next = sold[i]->next;
412	greg	1.8	}
413	greg	1.10	if (i > 0) { /* save oldest as return value */
414			sold[i]->next = freelist;
415			freelist = sold[i];
416			}
417	greg	1.8	}
418			return(sold[0]);
419			}
420
421
422			static char *scan_buf;
423
424
425	schorsch	2.11	static void
426			initscans(void) /* initialize scanline buffers */
427	greg	1.8	{
428			int scansize;
429			register SCAN *ptr;
430			register int i;
431			/* initialize positions */
432	greg	2.2	scanpos = (long )bmalloc(pysizsizeof(long));
433	greg	1.8	if (scanpos == NULL)
434			memerr("scanline positions");
435			for (i = pysiz-1; i >= 0; i--)
436			scanpos[i] = -1L;
437			curpos = pysiz-1;
438			/* clear hash table */
439			for (i = 0; i < HSIZE; i++)
440			hashtab[i] = NULL;
441			/* allocate scanline buffers */
442			scansize = sizeof(SCAN) + pxsiz*sizeof(COLR);
443	greg	2.8	#ifdef ALIGNT
444			scansize = scansize+(sizeof(ALIGNT)-1) & ~(sizeof(ALIGNT)-1);
445	greg	1.8	#endif
446			i = MAXSBUF / scansize; /* compute number to allocate */
447			if (i > HSIZE)
448			i = HSIZE;
449	greg	2.2	scanbufsiz = i*scansize;
450			scan_buf = bmalloc(scanbufsiz); /* get in one big chunk */
451	greg	1.8	if (scan_buf == NULL)
452			memerr("scanline buffers");
453			ptr = (SCAN *)scan_buf;
454			freelist = NULL; /* build our free list */
455			while (i-- > 0) {
456			ptr->y = -1;
457			ptr->lused = -1;
458			ptr->next = freelist;
459			freelist = ptr;
460			ptr = (SCAN )((char )ptr + scansize); /* beware of C bugs */
461			}
462			}
463
464
465	schorsch	2.11	static void
466			donescans(void) /* free up scanlines */
467	greg	1.8	{
468	greg	2.2	bfree(scan_buf, scanbufsiz);
469			bfree((char )scanpos, pysizsizeof(long));
470	greg	1.1	}