src/rt/rpict.c

/* Copyright (c) 1986 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "$SunId$ LBL";
#endif

/*
 *  rpict.c - routines and variables for picture generation.
 *
 *     8/14/85
 */

#include  "ray.h"

#ifdef BSD
#include  <sys/time.h>
#include  <sys/resource.h>
#endif

#include  "view.h"

#include  "random.h"

VIEW  ourview = STDVIEW(512);           /* view parameters */

int  psample = 4;                       /* pixel sample size */
double  maxdiff = .05;                  /* max. difference for interpolation */
double  dstrpix = 0.67;                 /* square pixel distribution */

double  dstrsrc = 0.0;                  /* square source distribution */
double  shadthresh = .05;               /* shadow threshold */
double  shadcert = .5;                  /* shadow certainty */

int  maxdepth = 6;                      /* maximum recursion depth */
double  minweight = 5e-3;               /* minimum ray weight */

COLOR  ambval = BLKCOLOR;               /* ambient value */
double  ambacc = 0.2;                   /* ambient accuracy */
int  ambres = 32;                       /* ambient resolution */
int  ambdiv = 128;                      /* ambient divisions */
int  ambssamp = 0;                      /* ambient super-samples */
int  ambounce = 0;                      /* ambient bounces */
char  *amblist[128];                    /* ambient include/exclude list */
int  ambincl = -1;                      /* include == 1, exclude == 0 */

int  ralrm = 0;                         /* seconds between reports */

double  pctdone = 0.0;                  /* percentage done */

extern long  nrays;                     /* number of rays traced */

static int  xres, yres;                 /* output x and y resolution */

#define  MAXDIV         32              /* maximum sample size */

#define  pixjitter()    (.5+dstrpix*(.5-frandom()))


quit(code)                      /* quit program */
int  code;
{
        if (code || ralrm > 0)          /* report status */
                report();

        exit(code);
}


report()                /* report progress */
{
#ifdef BSD
        struct rusage  rubuf;
        double  t;

        getrusage(RUSAGE_SELF, &rubuf);
        t = (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6;
        t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec;
        getrusage(RUSAGE_CHILDREN, &rubuf);
        t += (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6;
        t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec;

        sprintf(errmsg, "%ld rays, %4.2f%% done after %5.4f CPU hours\n",
                        nrays, pctdone, t/3600.0);
#else
        sprintf(errmsg, "%ld rays, %4.2f%% done\n", nrays, pctdone);
#endif
        eputs(errmsg);

        if (ralrm > 0)
                alarm(ralrm);
}


render(oldfile)                         /* render the scene */
char  *oldfile;
{
        COLOR  *scanbar[MAXDIV+1];      /* scanline arrays of pixel values */
        int  ypos;                      /* current scanline */
        COLOR  *colptr;
        register int  i;

        if (psample < 1)
                psample = 1;
        else if (psample > MAXDIV)
                psample = MAXDIV;
                                        /* output resolution may be smaller */
        xres = ourview.hresolu - (ourview.hresolu % psample);
        yres = ourview.vresolu - (ourview.vresolu % psample);

        for (i = 0; i <= psample; i++) {
                scanbar[i] = (COLOR *)malloc((xres+1)*sizeof(COLOR));
                if (scanbar[i] == NULL)
                        error(SYSTEM, "out of memory in render");
        }
                                        /* write out boundaries */
        fputresolu(YMAJOR|YDECR, xres, yres, stdout);

        ypos = yres - salvage(oldfile); /* find top line */
        fillscanline(scanbar[0], ypos, psample);        /* top scan */

        for (ypos -= psample; ypos > -psample; ypos -= psample) {
        
                colptr = scanbar[psample];              /* get last scanline */
                scanbar[psample] = scanbar[0];
                scanbar[0] = colptr;

                fillscanline(scanbar[0], ypos, psample);        /* base scan */
        
                fillscanbar(scanbar, ypos, psample);
                
                for (i = psample-1; i >= 0; i--)
                        if (fwritescan(scanbar[i], xres, stdout) < 0)
                                goto writerr;
                if (fflush(stdout) == EOF)
                        goto writerr;
                pctdone = 100.0*(yres-ypos)/yres;
        }
                
        for (i = 0; i <= psample; i++)
                free((char *)scanbar[i]);
        return;
writerr:
        error(SYSTEM, "write error in render");
}


fillscanline(scanline, y, xstep)                /* fill scan line at y */
register COLOR  *scanline;
int  y, xstep;
{
        int  b = xstep;
        register int  i;
        
        pixvalue(scanline[0], 0, y);

        for (i = xstep; i <= xres; i += xstep) {
        
                pixvalue(scanline[i], i, y);
                
                b = fillsample(scanline+i-xstep, i-xstep, y, xstep, 0, b/2);
        }
}


fillscanbar(scanbar, y, ysize)          /* fill interior */
register COLOR  *scanbar[];
int  y, ysize;
{
        COLOR  vline[MAXDIV+1];
        int  b = ysize;
        register int  i, j;
        
        for (i = 0; i < xres; i++) {
                
                copycolor(vline[0], scanbar[0][i]);
                copycolor(vline[ysize], scanbar[ysize][i]);
                
                b = fillsample(vline, i, y, 0, ysize, b/2);
                
                for (j = 1; j < ysize; j++)
                        copycolor(scanbar[j][i], vline[j]);
        }
}


int
fillsample(colline, x, y, xlen, ylen, b)        /* fill interior points */
register COLOR  *colline;
int  x, y;
int  xlen, ylen;
int  b;
{
        double  ratio;
        COLOR  ctmp;
        int  ncut;
        register int  len;
        
        if (xlen > 0)                   /* x or y length is zero */
                len = xlen;
        else
                len = ylen;
                
        if (len <= 1)                   /* limit recursion */
                return(0);
        
        if (b > 0 || bigdiff(colline[0], colline[len], maxdiff)) {
        
                pixvalue(colline[len>>1], x + (xlen>>1), y + (ylen>>1));
                ncut = 1;
                
        } else {                                        /* interpolate */
        
                copycolor(colline[len>>1], colline[len]);
                ratio = (double)(len>>1) / len;
                scalecolor(colline[len>>1], ratio);
                copycolor(ctmp, colline[0]);
                ratio = 1.0 - ratio;
                scalecolor(ctmp, ratio);
                addcolor(colline[len>>1], ctmp);
                ncut = 0;
        }
                                                        /* recurse */
        ncut += fillsample(colline, x, y, xlen>>1, ylen>>1, (b-1)/2);
        
        ncut += fillsample(colline + (len>>1), x + (xlen>>1), y + (ylen>>1),
                                xlen - (xlen>>1), ylen - (ylen>>1), b/2);

        return(ncut);
}


pixvalue(col, x, y)             /* compute pixel value */
COLOR  col;                     /* returned color */
int  x, y;                      /* pixel position */
{
        static RAY  thisray;    /* our ray for this pixel */

        rayview(thisray.rorg, thisray.rdir, &ourview,
                        x + pixjitter(), y + pixjitter());

        rayorigin(&thisray, NULL, PRIMARY, 1.0);
        
        rayvalue(&thisray);                     /* trace ray */

        copycolor(col, thisray.rcol);           /* return color */
}


int
salvage(oldfile)                /* salvage scanlines from killed program */
char  *oldfile;
{
        COLR  *scanline;
        FILE  *fp;
        int  x, y;

        if (oldfile == NULL)
                return(0);
        else if ((fp = fopen(oldfile, "r")) == NULL) {
                sprintf(errmsg, "cannot open recover file \"%s\"", oldfile);
                error(WARNING, errmsg);
                return(0);
        }
                                /* discard header */
        getheader(fp, NULL);
                                /* get picture size */
        if (fgetresolu(&x, &y, fp) != (YMAJOR|YDECR)) {
                sprintf(errmsg, "bad recover file \"%s\"", oldfile);
                error(WARNING, errmsg);
                fclose(fp);
                return(0);
        }

        if (x != xres || y != yres) {
                sprintf(errmsg, "resolution mismatch in recover file \"%s\"",
                                oldfile);
                error(USER, errmsg);
                return(0);
        }

        scanline = (COLR *)malloc(xres*sizeof(COLR));
        if (scanline == NULL)
                error(SYSTEM, "out of memory in salvage");
        for (y = 0; y < yres; y++) {
                if (freadcolrs(scanline, xres, fp) < 0)
                        break;
                if (fwritecolrs(scanline, xres, stdout) < 0)
                        goto writerr;
        }
        if (fflush(stdout) == EOF)
                goto writerr;
        free((char *)scanline);
        fclose(fp);
        unlink(oldfile);
        return(y);
writerr:
        error(SYSTEM, "write error in salvage");
}
Revision:	1.8
Committed:	Wed Sep 13 15:21:41 1989 UTC (36 years, 1 month ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.7:	+17 -16 lines
Log Message:	Added xres,yres variables so we don't mung ourview.[hv]resolu
#	User	Rev	Content
1	greg	1.1	/* Copyright (c) 1986 Regents of the University of California */
2
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* rpict.c - routines and variables for picture generation.
9			*
10			* 8/14/85
11			*/
12
13			#include "ray.h"
14
15			#ifdef BSD
16			#include <sys/time.h>
17			#include <sys/resource.h>
18			#endif
19
20			#include "view.h"
21
22			#include "random.h"
23
24			VIEW ourview = STDVIEW(512); /* view parameters */
25
26			int psample = 4; /* pixel sample size */
27			double maxdiff = .05; /* max. difference for interpolation */
28	greg	1.3	double dstrpix = 0.67; /* square pixel distribution */
29	greg	1.1
30			double dstrsrc = 0.0; /* square source distribution */
31	greg	1.4	double shadthresh = .05; /* shadow threshold */
32	greg	1.5	double shadcert = .5; /* shadow certainty */
33	greg	1.1
34			int maxdepth = 6; /* maximum recursion depth */
35			double minweight = 5e-3; /* minimum ray weight */
36
37			COLOR ambval = BLKCOLOR; /* ambient value */
38			double ambacc = 0.2; /* ambient accuracy */
39	greg	1.6	int ambres = 32; /* ambient resolution */
40	greg	1.1	int ambdiv = 128; /* ambient divisions */
41			int ambssamp = 0; /* ambient super-samples */
42			int ambounce = 0; /* ambient bounces */
43			char amblist[128]; / ambient include/exclude list */
44			int ambincl = -1; /* include == 1, exclude == 0 */
45
46			int ralrm = 0; /* seconds between reports */
47
48			double pctdone = 0.0; /* percentage done */
49
50			extern long nrays; /* number of rays traced */
51
52	greg	1.8	static int xres, yres; /* output x and y resolution */
53
54	greg	1.1	#define MAXDIV 32 /* maximum sample size */
55
56			#define pixjitter() (.5+dstrpix*(.5-frandom()))
57
58
59			quit(code) /* quit program */
60			int code;
61			{
62			if (code \|\| ralrm > 0) /* report status */
63			report();
64
65			exit(code);
66			}
67
68
69			report() /* report progress */
70			{
71			#ifdef BSD
72			struct rusage rubuf;
73			double t;
74
75			getrusage(RUSAGE_SELF, &rubuf);
76			t = (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6;
77			t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec;
78			getrusage(RUSAGE_CHILDREN, &rubuf);
79			t += (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6;
80			t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec;
81
82			sprintf(errmsg, "%ld rays, %4.2f%% done after %5.4f CPU hours\n",
83			nrays, pctdone, t/3600.0);
84			#else
85			sprintf(errmsg, "%ld rays, %4.2f%% done\n", nrays, pctdone);
86			#endif
87			eputs(errmsg);
88
89			if (ralrm > 0)
90			alarm(ralrm);
91			}
92
93
94			render(oldfile) /* render the scene */
95			char *oldfile;
96			{
97			COLOR scanbar[MAXDIV+1]; / scanline arrays of pixel values */
98			int ypos; /* current scanline */
99			COLOR *colptr;
100			register int i;
101
102			if (psample < 1)
103			psample = 1;
104			else if (psample > MAXDIV)
105			psample = MAXDIV;
106	greg	1.8	/* output resolution may be smaller */
107			xres = ourview.hresolu - (ourview.hresolu % psample);
108			yres = ourview.vresolu - (ourview.vresolu % psample);
109	greg	1.1
110			for (i = 0; i <= psample; i++) {
111	greg	1.8	scanbar[i] = (COLOR )malloc((xres+1)sizeof(COLOR));
112	greg	1.1	if (scanbar[i] == NULL)
113			error(SYSTEM, "out of memory in render");
114			}
115			/* write out boundaries */
116	greg	1.8	fputresolu(YMAJOR\|YDECR, xres, yres, stdout);
117	greg	1.1
118	greg	1.8	ypos = yres - salvage(oldfile); /* find top line */
119	greg	1.1	fillscanline(scanbar[0], ypos, psample); /* top scan */
120
121			for (ypos -= psample; ypos > -psample; ypos -= psample) {
122
123			colptr = scanbar[psample]; /* get last scanline */
124			scanbar[psample] = scanbar[0];
125			scanbar[0] = colptr;
126
127			fillscanline(scanbar[0], ypos, psample); /* base scan */
128
129			fillscanbar(scanbar, ypos, psample);
130
131			for (i = psample-1; i >= 0; i--)
132	greg	1.8	if (fwritescan(scanbar[i], xres, stdout) < 0)
133	greg	1.1	goto writerr;
134			if (fflush(stdout) == EOF)
135			goto writerr;
136	greg	1.8	pctdone = 100.0*(yres-ypos)/yres;
137	greg	1.1	}
138
139			for (i = 0; i <= psample; i++)
140			free((char *)scanbar[i]);
141			return;
142			writerr:
143			error(SYSTEM, "write error in render");
144			}
145
146
147			fillscanline(scanline, y, xstep) /* fill scan line at y */
148			register COLOR *scanline;
149			int y, xstep;
150			{
151			int b = xstep;
152			register int i;
153
154			pixvalue(scanline[0], 0, y);
155
156	greg	1.8	for (i = xstep; i <= xres; i += xstep) {
157	greg	1.1
158			pixvalue(scanline[i], i, y);
159
160			b = fillsample(scanline+i-xstep, i-xstep, y, xstep, 0, b/2);
161			}
162			}
163
164
165			fillscanbar(scanbar, y, ysize) /* fill interior */
166			register COLOR *scanbar[];
167			int y, ysize;
168			{
169			COLOR vline[MAXDIV+1];
170			int b = ysize;
171			register int i, j;
172
173	greg	1.8	for (i = 0; i < xres; i++) {
174	greg	1.1
175			copycolor(vline[0], scanbar[0][i]);
176			copycolor(vline[ysize], scanbar[ysize][i]);
177
178			b = fillsample(vline, i, y, 0, ysize, b/2);
179
180			for (j = 1; j < ysize; j++)
181			copycolor(scanbar[j][i], vline[j]);
182			}
183			}
184
185
186			int
187			fillsample(colline, x, y, xlen, ylen, b) /* fill interior points */
188			register COLOR *colline;
189			int x, y;
190			int xlen, ylen;
191			int b;
192			{
193			double ratio;
194			COLOR ctmp;
195			int ncut;
196			register int len;
197
198			if (xlen > 0) /* x or y length is zero */
199			len = xlen;
200			else
201			len = ylen;
202
203			if (len <= 1) /* limit recursion */
204			return(0);
205
206			if (b > 0 \|\| bigdiff(colline[0], colline[len], maxdiff)) {
207
208			pixvalue(colline[len>>1], x + (xlen>>1), y + (ylen>>1));
209			ncut = 1;
210
211			} else { /* interpolate */
212
213			copycolor(colline[len>>1], colline[len]);
214			ratio = (double)(len>>1) / len;
215			scalecolor(colline[len>>1], ratio);
216			copycolor(ctmp, colline[0]);
217			ratio = 1.0 - ratio;
218			scalecolor(ctmp, ratio);
219			addcolor(colline[len>>1], ctmp);
220			ncut = 0;
221			}
222			/* recurse */
223			ncut += fillsample(colline, x, y, xlen>>1, ylen>>1, (b-1)/2);
224
225			ncut += fillsample(colline + (len>>1), x + (xlen>>1), y + (ylen>>1),
226			xlen - (xlen>>1), ylen - (ylen>>1), b/2);
227
228			return(ncut);
229			}
230
231
232			pixvalue(col, x, y) /* compute pixel value */
233			COLOR col; /* returned color */
234			int x, y; /* pixel position */
235			{
236			static RAY thisray; /* our ray for this pixel */
237
238			rayview(thisray.rorg, thisray.rdir, &ourview,
239			x + pixjitter(), y + pixjitter());
240
241			rayorigin(&thisray, NULL, PRIMARY, 1.0);
242
243			rayvalue(&thisray); /* trace ray */
244
245			copycolor(col, thisray.rcol); /* return color */
246			}
247
248
249			int
250			salvage(oldfile) /* salvage scanlines from killed program */
251			char *oldfile;
252			{
253			COLR *scanline;
254			FILE *fp;
255			int x, y;
256
257			if (oldfile == NULL)
258			return(0);
259			else if ((fp = fopen(oldfile, "r")) == NULL) {
260			sprintf(errmsg, "cannot open recover file \"%s\"", oldfile);
261			error(WARNING, errmsg);
262			return(0);
263			}
264			/* discard header */
265			getheader(fp, NULL);
266			/* get picture size */
267	greg	1.7	if (fgetresolu(&x, &y, fp) != (YMAJOR\|YDECR)) {
268	greg	1.2	sprintf(errmsg, "bad recover file \"%s\"", oldfile);
269			error(WARNING, errmsg);
270	greg	1.1	fclose(fp);
271			return(0);
272			}
273
274	greg	1.8	if (x != xres \|\| y != yres) {
275	greg	1.1	sprintf(errmsg, "resolution mismatch in recover file \"%s\"",
276			oldfile);
277			error(USER, errmsg);
278			return(0);
279			}
280
281	greg	1.8	scanline = (COLR )malloc(xressizeof(COLR));
282	greg	1.1	if (scanline == NULL)
283			error(SYSTEM, "out of memory in salvage");
284	greg	1.8	for (y = 0; y < yres; y++) {
285			if (freadcolrs(scanline, xres, fp) < 0)
286	greg	1.1	break;
287	greg	1.8	if (fwritecolrs(scanline, xres, stdout) < 0)
288	greg	1.1	goto writerr;
289			}
290			if (fflush(stdout) == EOF)
291			goto writerr;
292			free((char *)scanline);
293			fclose(fp);
294			unlink(oldfile);
295			return(y);
296			writerr:
297			error(SYSTEM, "write error in salvage");
298			}