src/cv/bsdf2ttree.c

#ifndef lint
static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.26 2014/03/12 21:15:31 greg Exp $";
#endif
/*
 * Load measured BSDF interpolant and write out as XML file with tensor tree.
 *
 *      G. Ward
 */

#define _USE_MATH_DEFINES
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "random.h"
#include "platform.h"
#include "rtprocess.h"
#include "calcomp.h"
#include "bsdfrep.h"
                                /* global argv[0] */
char                    *progname;
                                /* percentage to cull (<0 to turn off) */
double                  pctcull = 90.;
                                /* sampling order */
int                     samp_order = 6;
                                /* super-sampling threshold */
const double            ssamp_thresh = 0.35;
                                /* number of super-samples */
const int               nssamp = 100;
                                /* limit on number of RBF lobes */
static int              lobe_lim = 15000;
                                /* progress bar length */
static int              do_prog = 79;


/* Start new progress bar */
#define prog_start(s)   if (do_prog) fprintf(stderr, "%s: %s...\n", progname, s); else

/* Draw progress bar of the appropriate length */
static void
prog_show(double frac)
{
        char    pbar[256];
        int     nchars;

        if (do_prog <= 0) return;
        if (do_prog > sizeof(pbar)-2)
                do_prog = sizeof(pbar)-2;
        if (frac < 0) frac = 0;
        else if (frac > 1) frac = 1;
        nchars = do_prog*frac + .5;
        pbar[0] = '\r';
        memset(pbar+1, '*', nchars);
        memset(pbar+1+nchars, '-', do_prog-nchars);
        pbar[do_prog+1] = '\0';
        fputs(pbar, stderr);
}

/* Finish progress bar */
static void
prog_done(void)
{
        int     n = do_prog;

        if (n <= 1) return;
        fputc('\r', stderr);
        while (n--)
                fputc(' ', stderr);
        fputc('\r', stderr);
}

/* Output XML prologue to stdout */
static void
xml_prologue(int ac, char *av[])
{
        puts("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
        puts("<WindowElement xmlns=\"http://windows.lbl.gov\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://windows.lbl.gov/BSDF-v1.4.xsd\">");
        fputs("<!-- File produced by:", stdout);
        while (ac-- > 0) {
                fputc(' ', stdout);
                fputs(*av++, stdout);
        }
        puts(" -->");
        puts("<WindowElementType>System</WindowElementType>");
        puts("<FileType>BSDF</FileType>");
        puts("<Optical>");
        puts("<Layer>");
        puts("\t<Material>");
        printf("\t\t<Name>%s</Name>\n", bsdf_name[0] ? bsdf_name : "Unknown");
        printf("\t\t<Manufacturer>%s</Manufacturer>\n",
                        bsdf_manuf[0] ? bsdf_manuf : "Unknown");
        puts("\t\t<DeviceType>Other</DeviceType>");
        puts("\t</Material>");
        puts("\t<DataDefinition>");
        printf("\t\t<IncidentDataStructure>TensorTree%c</IncidentDataStructure>\n",
                        single_plane_incident ? '3' : '4');
        puts("\t</DataDefinition>");
}

/* Output XML data prologue to stdout */
static void
data_prologue()
{
        static const char       *bsdf_type[4] = {
                                        "Reflection Front",
                                        "Transmission Front",
                                        "Transmission Back",
                                        "Reflection Back"
                                };

        puts("\t<WavelengthData>");
        puts("\t\t<LayerNumber>System</LayerNumber>");
        puts("\t\t<Wavelength unit=\"Integral\">Visible</Wavelength>");
        puts("\t\t<SourceSpectrum>CIE Illuminant D65 1nm.ssp</SourceSpectrum>");
        puts("\t\t<DetectorSpectrum>ASTM E308 1931 Y.dsp</DetectorSpectrum>");
        puts("\t\t<WavelengthDataBlock>");
        printf("\t\t\t<WavelengthDataDirection>%s</WavelengthDataDirection>\n",
                        bsdf_type[(input_orient>0)<<1 | (output_orient>0)]);
        puts("\t\t\t<AngleBasis>LBNL/Shirley-Chiu</AngleBasis>");
        puts("\t\t\t<ScatteringDataType>BTDF</ScatteringDataType>");
        puts("\t\t\t<ScatteringData>");
}

/* Output XML data epilogue to stdout */
static void
data_epilogue(void)
{
        puts("\t\t\t</ScatteringData>");
        puts("\t\t</WavelengthDataBlock>");
        puts("\t</WavelengthData>");
}

/* Output XML epilogue to stdout */
static void
xml_epilogue(void)
{
        puts("</Layer>");
        puts("</Optical>");
        puts("</WindowElement>");
}

/* Compute absolute relative difference */
static double
abs_diff(double v1, double v0)
{
        if ((v0 < 0) | (v1 < 0))
                return(.0);
        v1 = (v1-v0)*2./(v0+v1+.0001);
        if (v1 < 0)
                return(-v1);
        return(v1);
}

/* Interpolate and output isotropic BSDF data */
static void
eval_isotropic(char *funame)
{
        const int       sqres = 1<<samp_order;
        FILE            *ofp = NULL;
        int             assignD = 0;
        char            cmd[128];
        int             ix, ox, oy;
        double          iovec[6];
        float           bsdf;

        data_prologue();                        /* begin output */
        if (pctcull >= 0) {
                sprintf(cmd, "rttree_reduce -a -h -ff -r 3 -t %f -g %d",
                                pctcull, samp_order);
                fflush(stdout);
                ofp = popen(cmd, "w");
                if (ofp == NULL) {
                        fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
                                        progname);
                        exit(1);
                }
                SET_FILE_BINARY(ofp);
#ifdef getc_unlocked                            /* avoid lock/unlock overhead */
                flockfile(ofp);
#endif
        } else
                fputs("{\n", stdout);
                                                /* need to assign Dx, Dy, Dz? */
        if (funame != NULL)
                assignD = (fundefined(funame) < 6);
                                                /* run through directions */
        for (ix = 0; ix < sqres/2; ix++) {
                RBFNODE *rbf = NULL;
                iovec[0] = 2.*(ix+.5)/sqres - 1.;
                iovec[1] = .0;
                iovec[2] = input_orient * sqrt(1. - iovec[0]*iovec[0]);
                if (funame == NULL)
                        rbf = advect_rbf(iovec, lobe_lim);
                for (ox = 0; ox < sqres; ox++) {
                    float       last_bsdf = -1;
                    for (oy = 0; oy < sqres; oy++) {
                        SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres);
                        iovec[5] = output_orient *
                                sqrt(1. - iovec[3]*iovec[3] - iovec[4]*iovec[4]);
                        if (funame == NULL)
                            bsdf = eval_rbfrep(rbf, iovec+3) *
                                                output_orient/iovec[5];
                        else {
                            double      ssa[3], ssvec[6], sum;
                            int         ssi;
                            if (assignD) {
                                varset("Dx", '=', -iovec[3]);
                                varset("Dy", '=', -iovec[4]);
                                varset("Dz", '=', -iovec[5]);
                                ++eclock;
                            }
                            bsdf = funvalue(funame, 6, iovec);
                            if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
                                sum = 0;        /* super-sample voxel */
                                for (ssi = nssamp; ssi--; ) {
                                    SDmultiSamp(ssa, 3, (ssi+frandom())/nssamp);
                                    ssvec[0] = 2.*(ix+ssa[0])/sqres - 1.;
                                    ssvec[1] = .0;
                                    ssvec[2] = input_orient *
                                                sqrt(1. - ssvec[0]*ssvec[0]);
                                    SDsquare2disk(ssvec+3, (ox+ssa[1])/sqres,
                                                (oy+ssa[2])/sqres);
                                    ssvec[5] = output_orient *
                                                sqrt(1. - ssvec[3]*ssvec[3] -
                                                        ssvec[4]*ssvec[4]);
                                    if (assignD) {
                                        varset("Dx", '=', -iovec[3]);
                                        varset("Dy", '=', -iovec[4]);
                                        varset("Dz", '=', -iovec[5]);
                                        ++eclock;
                                    }
                                    sum += funvalue(funame, 6, ssvec);
                                }
                                bsdf = sum/nssamp;
                            }
                        }
                        if (pctcull >= 0)
                                fwrite(&bsdf, sizeof(bsdf), 1, ofp);
                        else
                                printf("\t%.3e\n", bsdf);
                        last_bsdf = bsdf;
                    }
                }
                if (rbf != NULL)
                        free(rbf);
                prog_show((ix+1.)*(2./sqres));
        }
        if (pctcull >= 0) {                     /* finish output */
                if (pclose(ofp)) {
                        fprintf(stderr, "%s: error running '%s'\n",
                                        progname, cmd);
                        exit(1);
                }
        } else {
                for (ix = sqres*sqres*sqres/2; ix--; )
                        fputs("\t0\n", stdout);
                fputs("}\n", stdout);
        }
        data_epilogue();
        prog_done();
}

/* Interpolate and output anisotropic BSDF data */
static void
eval_anisotropic(char *funame)
{
        const int       sqres = 1<<samp_order;
        FILE            *ofp = NULL;
        int             assignD = 0;
        char            cmd[128];
        int             ix, iy, ox, oy;
        double          iovec[6];
        float           bsdf;

        data_prologue();                        /* begin output */
        if (pctcull >= 0) {
                sprintf(cmd, "rttree_reduce%s -h -ff -r 4 -t %f -g %d",
                                (input_orient>0 ^ output_orient>0) ? "" : " -a",
                                pctcull, samp_order);
                fflush(stdout);
                ofp = popen(cmd, "w");
                if (ofp == NULL) {
                        fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
                                        progname);
                        exit(1);
                }
                SET_FILE_BINARY(ofp);
#ifdef getc_unlocked                            /* avoid lock/unlock overhead */
                flockfile(ofp);
#endif
        } else
                fputs("{\n", stdout);
                                                /* need to assign Dx, Dy, Dz? */
        if (funame != NULL)
                assignD = (fundefined(funame) < 6);
                                                /* run through directions */
        for (ix = 0; ix < sqres; ix++)
            for (iy = 0; iy < sqres; iy++) {
                RBFNODE *rbf = NULL;            /* Klems reversal */
                SDsquare2disk(iovec, 1.-(ix+.5)/sqres, 1.-(iy+.5)/sqres);
                iovec[2] = input_orient *
                                sqrt(1. - iovec[0]*iovec[0] - iovec[1]*iovec[1]);
                if (funame == NULL)
                        rbf = advect_rbf(iovec, lobe_lim);
                for (ox = 0; ox < sqres; ox++) {
                    float       last_bsdf = -1;
                    for (oy = 0; oy < sqres; oy++) {
                        SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres);
                        iovec[5] = output_orient *
                                sqrt(1. - iovec[3]*iovec[3] - iovec[4]*iovec[4]);
                        if (funame == NULL)
                            bsdf = eval_rbfrep(rbf, iovec+3) *
                                                output_orient/iovec[5];
                        else {
                            double      ssa[4], ssvec[6], sum;
                            int         ssi;
                            if (assignD) {
                                varset("Dx", '=', -iovec[3]);
                                varset("Dy", '=', -iovec[4]);
                                varset("Dz", '=', -iovec[5]);
                                ++eclock;
                            }
                            bsdf = funvalue(funame, 6, iovec);
                            if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
                                sum = 0;        /* super-sample voxel */
                                for (ssi = nssamp; ssi--; ) {
                                    SDmultiSamp(ssa, 4, (ssi+frandom())/nssamp);
                                    SDsquare2disk(ssvec, 1.-(ix+ssa[0])/sqres,
                                                1.-(iy+ssa[1])/sqres);
                                    ssvec[2] = output_orient *
                                                sqrt(1. - ssvec[0]*ssvec[0] -
                                                        ssvec[1]*ssvec[1]);
                                    SDsquare2disk(ssvec+3, (ox+ssa[2])/sqres,
                                                (oy+ssa[3])/sqres);
                                    ssvec[5] = output_orient *
                                                sqrt(1. - ssvec[3]*ssvec[3] -
                                                        ssvec[4]*ssvec[4]);
                                    if (assignD) {
                                        varset("Dx", '=', -iovec[3]);
                                        varset("Dy", '=', -iovec[4]);
                                        varset("Dz", '=', -iovec[5]);
                                        ++eclock;
                                    }
                                    sum += funvalue(funame, 6, ssvec);
                                }
                                bsdf = sum/nssamp;
                            }
                        }
                        if (pctcull >= 0)
                                fwrite(&bsdf, sizeof(bsdf), 1, ofp);
                        else
                                printf("\t%.3e\n", bsdf);
                        last_bsdf = bsdf;
                    }
                }
                if (rbf != NULL)
                        free(rbf);
                prog_show((ix*sqres+iy+1.)/(sqres*sqres));
            }
        if (pctcull >= 0) {                     /* finish output */
                if (pclose(ofp)) {
                        fprintf(stderr, "%s: error running '%s'\n",
                                        progname, cmd);
                        exit(1);
                }
        } else
                fputs("}\n", stdout);
        data_epilogue();
        prog_done();
}

/* Read in BSDF and interpolate as tensor tree representation */
int
main(int argc, char *argv[])
{
        int     dofwd = 0, dobwd = 1;
        int     i, na;

        progname = argv[0];
        esupport |= E_VARIABLE|E_FUNCTION|E_RCONST;
        esupport &= ~(E_INCHAN|E_OUTCHAN);
        scompile("PI:3.14159265358979323846", NULL, 0);
        biggerlib();
        for (i = 1; i < argc-1 && (argv[i][0] == '-') | (argv[i][0] == '+'); i++)
                switch (argv[i][1]) {           /* get options */
                case 'e':
                        scompile(argv[++i], NULL, 0);
                        break;
                case 'f':
                        if (!argv[i][2])
                                fcompile(argv[++i]);
                        else
                                dofwd = (argv[i][0] == '+');
                        break;
                case 'b':
                        dobwd = (argv[i][0] == '+');
                        break;
                case 't':
                        switch (argv[i][2]) {
                        case '3':
                                single_plane_incident = 1;
                                break;
                        case '4':
                                single_plane_incident = 0;
                                break;
                        case '\0':
                                pctcull = atof(argv[++i]);
                                break;
                        default:
                                goto userr;
                        }
                        break;
                case 'g':
                        samp_order = atoi(argv[++i]);
                        break;
                case 'l':
                        lobe_lim = atoi(argv[++i]);
                        break;
                case 'p':
                        do_prog = atoi(argv[i]+2);
                        break;
                default:
                        goto userr;
                }
        if (single_plane_incident >= 0) {       /* function-based BSDF? */
                void    (*evf)(char *s) = single_plane_incident ?
                                &eval_isotropic : &eval_anisotropic;
                if (i != argc-1 || fundefined(argv[i]) < 3) {
                        fprintf(stderr,
        "%s: need single function with 6 arguments: bsdf(ix,iy,iz,ox,oy,oz)\n",
                                        progname);
                        fprintf(stderr, "\tor 3 arguments using Dx,Dy,Dz: bsdf(ix,iy,iz)\n");
                        goto userr;
                }
                ++eclock;
                xml_prologue(argc, argv);       /* start XML output */
                if (dofwd) {
                        input_orient = -1;
                        output_orient = -1;
                        prog_start("Evaluating outside reflectance");
                        (*evf)(argv[i]);
                        output_orient = 1;
                        prog_start("Evaluating outside->inside transmission");
                        (*evf)(argv[i]);
                }
                if (dobwd) {
                        input_orient = 1;
                        output_orient = 1;
                        prog_start("Evaluating inside reflectance");
                        (*evf)(argv[i]);
                        output_orient = -1;
                        prog_start("Evaluating inside->outside transmission");
                        (*evf)(argv[i]);
                }
                xml_epilogue();                 /* finish XML output & exit */
                return(0);
        }
        if (i < argc) {                         /* open input files if given */
                int     nbsdf = 0;
                for ( ; i < argc; i++) {        /* interpolate each component */
                        char    pbuf[256];
                        FILE    *fpin = fopen(argv[i], "rb");
                        if (fpin == NULL) {
                                fprintf(stderr, "%s: cannot open BSDF interpolant '%s'\n",
                                                progname, argv[i]);
                                return(1);
                        }
                        if (!load_bsdf_rep(fpin))
                                return(1);
                        fclose(fpin);
                        if (!nbsdf++)           /* start XML on first dist. */
                                xml_prologue(argc, argv);
                        sprintf(pbuf, "Interpolating component '%s'", argv[i]);
                        prog_start(pbuf);
                        if (single_plane_incident)
                                eval_isotropic(NULL);
                        else
                                eval_anisotropic(NULL);
                }
                xml_epilogue();                 /* finish XML output & exit */
                return(0);
        }
        SET_FILE_BINARY(stdin);                 /* load from stdin */
        if (!load_bsdf_rep(stdin))
                return(1);
        xml_prologue(argc, argv);               /* start XML output */
        prog_start("Interpolating from standard input");
        if (single_plane_incident)              /* resample dist. */
                eval_isotropic(NULL);
        else
                eval_anisotropic(NULL);
        xml_epilogue();                         /* finish XML output & exit */
        return(0);
userr:
        fprintf(stderr,
        "Usage: %s [-g Nlog2][-t pctcull][-l maxlobes] [bsdf.sir ..] > bsdf.xml\n",
                                progname);
        fprintf(stderr,
        "   or: %s -t{3|4} [-g Nlog2][-t pctcull][{+|-}for[ward]][{+|-}b[ackward]][-e expr][-f file] bsdf_func > bsdf.xml\n",
                                progname);
        return(1);
}
Revision:	2.27
Committed:	Wed Mar 12 22:24:59 2014 UTC (10 years, 1 month ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.26:	+12 -2 lines
Log Message:	Changed progress bar to erase itself when done
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.27	static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.26 2014/03/12 21:15:31 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* Load measured BSDF interpolant and write out as XML file with tensor tree.
6			*
7			* G. Ward
8			*/
9
10			#define _USE_MATH_DEFINES
11			#include <stdio.h>
12			#include <stdlib.h>
13			#include <math.h>
14	greg	2.23	#include "random.h"
15	greg	2.1	#include "platform.h"
16	greg	2.22	#include "rtprocess.h"
17	greg	2.11	#include "calcomp.h"
18	greg	2.1	#include "bsdfrep.h"
19			/* global argv[0] */
20			char *progname;
21			/* percentage to cull (<0 to turn off) */
22	greg	2.7	double pctcull = 90.;
23	greg	2.1	/* sampling order */
24			int samp_order = 6;
25	greg	2.15	/* super-sampling threshold */
26			const double ssamp_thresh = 0.35;
27			/* number of super-samples */
28			const int nssamp = 100;
29	greg	2.18	/* limit on number of RBF lobes */
30			static int lobe_lim = 15000;
31	greg	2.26	/* progress bar length */
32			static int do_prog = 79;
33
34
35			/* Start new progress bar */
36			#define prog_start(s) if (do_prog) fprintf(stderr, "%s: %s...\n", progname, s); else
37
38			/* Draw progress bar of the appropriate length */
39			static void
40			prog_show(double frac)
41			{
42			char pbar[256];
43			int nchars;
44
45			if (do_prog <= 0) return;
46			if (do_prog > sizeof(pbar)-2)
47			do_prog = sizeof(pbar)-2;
48			if (frac < 0) frac = 0;
49			else if (frac > 1) frac = 1;
50			nchars = do_prog*frac + .5;
51			pbar[0] = '\r';
52			memset(pbar+1, '*', nchars);
53			memset(pbar+1+nchars, '-', do_prog-nchars);
54			pbar[do_prog+1] = '\0';
55			fputs(pbar, stderr);
56			}
57
58			/* Finish progress bar */
59	greg	2.27	static void
60			prog_done(void)
61			{
62			int n = do_prog;
63
64			if (n <= 1) return;
65			fputc('\r', stderr);
66			while (n--)
67			fputc(' ', stderr);
68			fputc('\r', stderr);
69			}
70	greg	2.1
71	greg	2.11	/* Output XML prologue to stdout */
72			static void
73			xml_prologue(int ac, char *av[])
74			{
75			puts("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
76			puts("<WindowElement xmlns=\"http://windows.lbl.gov\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://windows.lbl.gov/BSDF-v1.4.xsd\">");
77			fputs("<!-- File produced by:", stdout);
78			while (ac-- > 0) {
79			fputc(' ', stdout);
80			fputs(*av++, stdout);
81			}
82			puts(" -->");
83			puts("<WindowElementType>System</WindowElementType>");
84			puts("<FileType>BSDF</FileType>");
85			puts("<Optical>");
86			puts("<Layer>");
87			puts("\t<Material>");
88	greg	2.21	printf("\t\t<Name>%s</Name>\n", bsdf_name[0] ? bsdf_name : "Unknown");
89			printf("\t\t<Manufacturer>%s</Manufacturer>\n",
90			bsdf_manuf[0] ? bsdf_manuf : "Unknown");
91	greg	2.11	puts("\t\t<DeviceType>Other</DeviceType>");
92			puts("\t</Material>");
93			puts("\t<DataDefinition>");
94			printf("\t\t<IncidentDataStructure>TensorTree%c</IncidentDataStructure>\n",
95			single_plane_incident ? '3' : '4');
96			puts("\t</DataDefinition>");
97			}
98
99			/* Output XML data prologue to stdout */
100			static void
101			data_prologue()
102			{
103			static const char *bsdf_type[4] = {
104			"Reflection Front",
105			"Transmission Front",
106			"Transmission Back",
107			"Reflection Back"
108			};
109
110			puts("\t<WavelengthData>");
111			puts("\t\t<LayerNumber>System</LayerNumber>");
112			puts("\t\t<Wavelength unit=\"Integral\">Visible</Wavelength>");
113			puts("\t\t<SourceSpectrum>CIE Illuminant D65 1nm.ssp</SourceSpectrum>");
114			puts("\t\t<DetectorSpectrum>ASTM E308 1931 Y.dsp</DetectorSpectrum>");
115			puts("\t\t<WavelengthDataBlock>");
116			printf("\t\t\t<WavelengthDataDirection>%s</WavelengthDataDirection>\n",
117			bsdf_type[(input_orient>0)<<1 \| (output_orient>0)]);
118			puts("\t\t\t<AngleBasis>LBNL/Shirley-Chiu</AngleBasis>");
119			puts("\t\t\t<ScatteringDataType>BTDF</ScatteringDataType>");
120			puts("\t\t\t<ScatteringData>");
121			}
122
123			/* Output XML data epilogue to stdout */
124			static void
125			data_epilogue(void)
126			{
127			puts("\t\t\t</ScatteringData>");
128			puts("\t\t</WavelengthDataBlock>");
129			puts("\t</WavelengthData>");
130			}
131
132			/* Output XML epilogue to stdout */
133			static void
134			xml_epilogue(void)
135			{
136			puts("</Layer>");
137			puts("</Optical>");
138			puts("</WindowElement>");
139			}
140
141	greg	2.15	/* Compute absolute relative difference */
142			static double
143			abs_diff(double v1, double v0)
144			{
145			if ((v0 < 0) \| (v1 < 0))
146			return(.0);
147			v1 = (v1-v0)*2./(v0+v1+.0001);
148			if (v1 < 0)
149			return(-v1);
150			return(v1);
151			}
152
153	greg	2.1	/* Interpolate and output isotropic BSDF data */
154			static void
155	greg	2.11	eval_isotropic(char *funame)
156	greg	2.1	{
157			const int sqres = 1<<samp_order;
158			FILE *ofp = NULL;
159	greg	2.17	int assignD = 0;
160	greg	2.1	char cmd[128];
161			int ix, ox, oy;
162	greg	2.11	double iovec[6];
163	greg	2.4	float bsdf;
164	greg	2.15
165	greg	2.11	data_prologue(); /* begin output */
166			if (pctcull >= 0) {
167	greg	2.20	sprintf(cmd, "rttree_reduce -a -h -ff -r 3 -t %f -g %d",
168	greg	2.1	pctcull, samp_order);
169			fflush(stdout);
170			ofp = popen(cmd, "w");
171			if (ofp == NULL) {
172			fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
173			progname);
174			exit(1);
175			}
176			SET_FILE_BINARY(ofp);
177	greg	2.25	#ifdef getc_unlocked /* avoid lock/unlock overhead */
178			flockfile(ofp);
179			#endif
180	greg	2.1	} else
181			fputs("{\n", stdout);
182	greg	2.17	/* need to assign Dx, Dy, Dz? */
183			if (funame != NULL)
184			assignD = (fundefined(funame) < 6);
185	greg	2.1	/* run through directions */
186			for (ix = 0; ix < sqres/2; ix++) {
187	greg	2.11	RBFNODE *rbf = NULL;
188	greg	2.14	iovec[0] = 2.*(ix+.5)/sqres - 1.;
189	greg	2.11	iovec[1] = .0;
190			iovec[2] = input_orient * sqrt(1. - iovec[0]*iovec[0]);
191			if (funame == NULL)
192	greg	2.18	rbf = advect_rbf(iovec, lobe_lim);
193	greg	2.15	for (ox = 0; ox < sqres; ox++) {
194			float last_bsdf = -1;
195	greg	2.1	for (oy = 0; oy < sqres; oy++) {
196	greg	2.11	SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres);
197			iovec[5] = output_orient *
198			sqrt(1. - iovec[3]iovec[3] - iovec[4]iovec[4]);
199			if (funame == NULL)
200	greg	2.15	bsdf = eval_rbfrep(rbf, iovec+3) *
201	greg	2.11	output_orient/iovec[5];
202	greg	2.15	else {
203	greg	2.16	double ssa[3], ssvec[6], sum;
204	greg	2.15	int ssi;
205	greg	2.17	if (assignD) {
206			varset("Dx", '=', -iovec[3]);
207			varset("Dy", '=', -iovec[4]);
208			varset("Dz", '=', -iovec[5]);
209			++eclock;
210			}
211	greg	2.15	bsdf = funvalue(funame, 6, iovec);
212			if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
213	greg	2.16	sum = 0; /* super-sample voxel */
214	greg	2.15	for (ssi = nssamp; ssi--; ) {
215	greg	2.23	SDmultiSamp(ssa, 3, (ssi+frandom())/nssamp);
216	greg	2.15	ssvec[0] = 2.*(ix+ssa[0])/sqres - 1.;
217			ssvec[1] = .0;
218			ssvec[2] = input_orient *
219			sqrt(1. - ssvec[0]*ssvec[0]);
220			SDsquare2disk(ssvec+3, (ox+ssa[1])/sqres,
221			(oy+ssa[2])/sqres);
222			ssvec[5] = output_orient *
223			sqrt(1. - ssvec[3]*ssvec[3] -
224			ssvec[4]*ssvec[4]);
225	greg	2.17	if (assignD) {
226			varset("Dx", '=', -iovec[3]);
227			varset("Dy", '=', -iovec[4]);
228			varset("Dz", '=', -iovec[5]);
229			++eclock;
230			}
231	greg	2.16	sum += funvalue(funame, 6, ssvec);
232	greg	2.15	}
233	greg	2.16	bsdf = sum/nssamp;
234	greg	2.15	}
235			}
236	greg	2.1	if (pctcull >= 0)
237			fwrite(&bsdf, sizeof(bsdf), 1, ofp);
238			else
239			printf("\t%.3e\n", bsdf);
240	greg	2.15	last_bsdf = bsdf;
241	greg	2.1	}
242	greg	2.15	}
243	greg	2.3	if (rbf != NULL)
244			free(rbf);
245	greg	2.26	prog_show((ix+1.)*(2./sqres));
246	greg	2.1	}
247			if (pctcull >= 0) { /* finish output */
248			if (pclose(ofp)) {
249			fprintf(stderr, "%s: error running '%s'\n",
250			progname, cmd);
251			exit(1);
252			}
253			} else {
254			for (ix = sqressqressqres/2; ix--; )
255			fputs("\t0\n", stdout);
256			fputs("}\n", stdout);
257			}
258	greg	2.11	data_epilogue();
259	greg	2.26	prog_done();
260	greg	2.1	}
261
262			/* Interpolate and output anisotropic BSDF data */
263			static void
264	greg	2.11	eval_anisotropic(char *funame)
265	greg	2.1	{
266			const int sqres = 1<<samp_order;
267			FILE *ofp = NULL;
268	greg	2.17	int assignD = 0;
269	greg	2.1	char cmd[128];
270			int ix, iy, ox, oy;
271	greg	2.11	double iovec[6];
272	greg	2.4	float bsdf;
273	greg	2.15
274	greg	2.11	data_prologue(); /* begin output */
275			if (pctcull >= 0) {
276	greg	2.19	sprintf(cmd, "rttree_reduce%s -h -ff -r 4 -t %f -g %d",
277			(input_orient>0 ^ output_orient>0) ? "" : " -a",
278	greg	2.1	pctcull, samp_order);
279			fflush(stdout);
280			ofp = popen(cmd, "w");
281			if (ofp == NULL) {
282			fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
283			progname);
284			exit(1);
285			}
286	greg	2.25	SET_FILE_BINARY(ofp);
287			#ifdef getc_unlocked /* avoid lock/unlock overhead */
288			flockfile(ofp);
289			#endif
290	greg	2.1	} else
291			fputs("{\n", stdout);
292	greg	2.17	/* need to assign Dx, Dy, Dz? */
293			if (funame != NULL)
294			assignD = (fundefined(funame) < 6);
295	greg	2.1	/* run through directions */
296			for (ix = 0; ix < sqres; ix++)
297			for (iy = 0; iy < sqres; iy++) {
298	greg	2.11	RBFNODE rbf = NULL; / Klems reversal */
299	greg	2.15	SDsquare2disk(iovec, 1.-(ix+.5)/sqres, 1.-(iy+.5)/sqres);
300	greg	2.11	iovec[2] = input_orient *
301			sqrt(1. - iovec[0]iovec[0] - iovec[1]iovec[1]);
302			if (funame == NULL)
303	greg	2.18	rbf = advect_rbf(iovec, lobe_lim);
304	greg	2.15	for (ox = 0; ox < sqres; ox++) {
305			float last_bsdf = -1;
306	greg	2.1	for (oy = 0; oy < sqres; oy++) {
307	greg	2.11	SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres);
308			iovec[5] = output_orient *
309			sqrt(1. - iovec[3]iovec[3] - iovec[4]iovec[4]);
310			if (funame == NULL)
311	greg	2.15	bsdf = eval_rbfrep(rbf, iovec+3) *
312	greg	2.11	output_orient/iovec[5];
313	greg	2.15	else {
314	greg	2.16	double ssa[4], ssvec[6], sum;
315	greg	2.15	int ssi;
316	greg	2.17	if (assignD) {
317			varset("Dx", '=', -iovec[3]);
318			varset("Dy", '=', -iovec[4]);
319			varset("Dz", '=', -iovec[5]);
320			++eclock;
321			}
322	greg	2.15	bsdf = funvalue(funame, 6, iovec);
323			if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
324	greg	2.16	sum = 0; /* super-sample voxel */
325	greg	2.15	for (ssi = nssamp; ssi--; ) {
326	greg	2.23	SDmultiSamp(ssa, 4, (ssi+frandom())/nssamp);
327	greg	2.15	SDsquare2disk(ssvec, 1.-(ix+ssa[0])/sqres,
328			1.-(iy+ssa[1])/sqres);
329			ssvec[2] = output_orient *
330			sqrt(1. - ssvec[0]*ssvec[0] -
331			ssvec[1]*ssvec[1]);
332			SDsquare2disk(ssvec+3, (ox+ssa[2])/sqres,
333			(oy+ssa[3])/sqres);
334			ssvec[5] = output_orient *
335			sqrt(1. - ssvec[3]*ssvec[3] -
336			ssvec[4]*ssvec[4]);
337	greg	2.17	if (assignD) {
338			varset("Dx", '=', -iovec[3]);
339			varset("Dy", '=', -iovec[4]);
340			varset("Dz", '=', -iovec[5]);
341			++eclock;
342			}
343	greg	2.16	sum += funvalue(funame, 6, ssvec);
344	greg	2.15	}
345	greg	2.16	bsdf = sum/nssamp;
346	greg	2.15	}
347			}
348	greg	2.1	if (pctcull >= 0)
349			fwrite(&bsdf, sizeof(bsdf), 1, ofp);
350			else
351			printf("\t%.3e\n", bsdf);
352	greg	2.15	last_bsdf = bsdf;
353	greg	2.1	}
354	greg	2.15	}
355	greg	2.3	if (rbf != NULL)
356			free(rbf);
357	greg	2.26	prog_show((ixsqres+iy+1.)/(sqressqres));
358	greg	2.1	}
359			if (pctcull >= 0) { /* finish output */
360			if (pclose(ofp)) {
361			fprintf(stderr, "%s: error running '%s'\n",
362			progname, cmd);
363			exit(1);
364			}
365			} else
366			fputs("}\n", stdout);
367	greg	2.11	data_epilogue();
368	greg	2.26	prog_done();
369	greg	2.5	}
370
371	greg	2.1	/* Read in BSDF and interpolate as tensor tree representation */
372			int
373			main(int argc, char *argv[])
374			{
375	greg	2.11	int dofwd = 0, dobwd = 1;
376			int i, na;
377	greg	2.1
378	greg	2.5	progname = argv[0];
379	greg	2.11	esupport \|= E_VARIABLE\|E_FUNCTION\|E_RCONST;
380			esupport &= ~(E_INCHAN\|E_OUTCHAN);
381			scompile("PI:3.14159265358979323846", NULL, 0);
382			biggerlib();
383			for (i = 1; i < argc-1 && (argv[i][0] == '-') \| (argv[i][0] == '+'); i++)
384			switch (argv[i][1]) { /* get options */
385			case 'e':
386			scompile(argv[++i], NULL, 0);
387			break;
388			case 'f':
389			if (!argv[i][2])
390			fcompile(argv[++i]);
391			else
392			dofwd = (argv[i][0] == '+');
393			break;
394			case 'b':
395			dobwd = (argv[i][0] == '+');
396			break;
397	greg	2.1	case 't':
398	greg	2.11	switch (argv[i][2]) {
399			case '3':
400	greg	2.13	single_plane_incident = 1;
401	greg	2.11	break;
402			case '4':
403	greg	2.13	single_plane_incident = 0;
404	greg	2.11	break;
405			case '\0':
406			pctcull = atof(argv[++i]);
407			break;
408			default:
409			goto userr;
410			}
411	greg	2.1	break;
412			case 'g':
413	greg	2.5	samp_order = atoi(argv[++i]);
414	greg	2.1	break;
415	greg	2.18	case 'l':
416			lobe_lim = atoi(argv[++i]);
417			break;
418	greg	2.26	case 'p':
419			do_prog = atoi(argv[i]+2);
420			break;
421	greg	2.1	default:
422			goto userr;
423			}
424	greg	2.11	if (single_plane_incident >= 0) { /* function-based BSDF? */
425			void (evf)(char s) = single_plane_incident ?
426			&eval_isotropic : &eval_anisotropic;
427	greg	2.17	if (i != argc-1 \|\| fundefined(argv[i]) < 3) {
428	greg	2.12	fprintf(stderr,
429			"%s: need single function with 6 arguments: bsdf(ix,iy,iz,ox,oy,oz)\n",
430			progname);
431	greg	2.24	fprintf(stderr, "\tor 3 arguments using Dx,Dy,Dz: bsdf(ix,iy,iz)\n");
432	greg	2.11	goto userr;
433	greg	2.12	}
434	greg	2.17	++eclock;
435	greg	2.11	xml_prologue(argc, argv); /* start XML output */
436			if (dofwd) {
437			input_orient = -1;
438			output_orient = -1;
439	greg	2.26	prog_start("Evaluating outside reflectance");
440			(*evf)(argv[i]);
441	greg	2.11	output_orient = 1;
442	greg	2.26	prog_start("Evaluating outside->inside transmission");
443			(*evf)(argv[i]);
444	greg	2.11	}
445			if (dobwd) {
446			input_orient = 1;
447			output_orient = 1;
448	greg	2.26	prog_start("Evaluating inside reflectance");
449			(*evf)(argv[i]);
450	greg	2.11	output_orient = -1;
451	greg	2.26	prog_start("Evaluating inside->outside transmission");
452			(*evf)(argv[i]);
453	greg	2.11	}
454			xml_epilogue(); /* finish XML output & exit */
455			return(0);
456			}
457			if (i < argc) { /* open input files if given */
458	greg	2.12	int nbsdf = 0;
459	greg	2.11	for ( ; i < argc; i++) { /* interpolate each component */
460	greg	2.26	char pbuf[256];
461	greg	2.11	FILE *fpin = fopen(argv[i], "rb");
462			if (fpin == NULL) {
463			fprintf(stderr, "%s: cannot open BSDF interpolant '%s'\n",
464			progname, argv[i]);
465			return(1);
466			}
467			if (!load_bsdf_rep(fpin))
468			return(1);
469			fclose(fpin);
470	greg	2.12	if (!nbsdf++) /* start XML on first dist. */
471			xml_prologue(argc, argv);
472	greg	2.26	sprintf(pbuf, "Interpolating component '%s'", argv[i]);
473			prog_start(pbuf);
474	greg	2.11	if (single_plane_incident)
475			eval_isotropic(NULL);
476			else
477			eval_anisotropic(NULL);
478			}
479			xml_epilogue(); /* finish XML output & exit */
480			return(0);
481			}
482			SET_FILE_BINARY(stdin); /* load from stdin */
483			if (!load_bsdf_rep(stdin))
484	greg	2.1	return(1);
485	greg	2.5	xml_prologue(argc, argv); /* start XML output */
486	greg	2.26	prog_start("Interpolating from standard input");
487	greg	2.1	if (single_plane_incident) /* resample dist. */
488	greg	2.11	eval_isotropic(NULL);
489	greg	2.1	else
490	greg	2.11	eval_anisotropic(NULL);
491			xml_epilogue(); /* finish XML output & exit */
492	greg	2.1	return(0);
493			userr:
494			fprintf(stderr,
495	greg	2.18	"Usage: %s [-g Nlog2][-t pctcull][-l maxlobes] [bsdf.sir ..] > bsdf.xml\n",
496	greg	2.11	progname);
497			fprintf(stderr,
498			" or: %s -t{3\|4} [-g Nlog2][-t pctcull][{+\|-}for[ward]][{+\|-}b[ackward]][-e expr][-f file] bsdf_func > bsdf.xml\n",
499	greg	2.1	progname);
500			return(1);
501			}