src/cv/bsdf2ttree.c

#ifndef lint
static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.27 2014/03/12 22:24:59 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 */
#ifndef NSSAMP
#define NSSAMP          100
#endif
                                /* 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 {
                            if (assignD) {
                                varset("Dx", '=', -iovec[3]);
                                varset("Dy", '=', -iovec[4]);
                                varset("Dz", '=', -iovec[5]);
                                ++eclock;
                            }
                            bsdf = funvalue(funame, 6, iovec);
#if (NSSAMP > 0)
                            if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
                                int     ssi;
                                double  ssa[3], ssvec[6], sum = 0;
                                                /* super-sample voxel */
                                for (ssi = NSSAMP; ssi--; ) {
                                    SDmultiSamp(ssa, 3, (ssi+frandom()) *
                                                        (1./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", '=', -ssvec[3]);
                                        varset("Dy", '=', -ssvec[4]);
                                        varset("Dz", '=', -ssvec[5]);
                                        ++eclock;
                                    }
                                    sum += funvalue(funame, 6, ssvec);
                                }
                                bsdf = sum/NSSAMP;
                            }
#endif
                        }
                        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 {
                            if (assignD) {
                                varset("Dx", '=', -iovec[3]);
                                varset("Dy", '=', -iovec[4]);
                                varset("Dz", '=', -iovec[5]);
                                ++eclock;
                            }
                            bsdf = funvalue(funame, 6, iovec);
#if (NSSAMP > 0)
                            if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
                                int     ssi;
                                double  ssa[4], ssvec[6], sum = 0;
                                                /* super-sample voxel */
                                for (ssi = NSSAMP; ssi--; ) {
                                    SDmultiSamp(ssa, 4, (ssi+frandom()) *
                                                        (1./NSSAMP));
                                    SDsquare2disk(ssvec, 1.-(ix+ssa[0])/sqres,
                                                1.-(iy+ssa[1])/sqres);
                                    ssvec[2] = input_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", '=', -ssvec[3]);
                                        varset("Dy", '=', -ssvec[4]);
                                        varset("Dz", '=', -ssvec[5]);
                                        ++eclock;
                                    }
                                    sum += funvalue(funame, 6, ssvec);
                                }
                                bsdf = sum/NSSAMP;
                            }
#endif
                        }
                        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:	2.28
Committed:	Mon Mar 24 03:50:28 2014 UTC (11 years, 7 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad4R2
Changes since 2.27:	+29 -21 lines
Log Message:	Fixed one minor and one major bug in super-sampling (major bug in transmission)
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.28	static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.27 2014/03/12 22:24:59 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	greg	2.28	#ifndef NSSAMP
29			#define NSSAMP 100
30			#endif
31	greg	2.18	/* limit on number of RBF lobes */
32			static int lobe_lim = 15000;
33	greg	2.26	/* progress bar length */
34			static int do_prog = 79;
35
36
37			/* Start new progress bar */
38			#define prog_start(s) if (do_prog) fprintf(stderr, "%s: %s...\n", progname, s); else
39
40			/* Draw progress bar of the appropriate length */
41			static void
42			prog_show(double frac)
43			{
44			char pbar[256];
45			int nchars;
46
47			if (do_prog <= 0) return;
48			if (do_prog > sizeof(pbar)-2)
49			do_prog = sizeof(pbar)-2;
50			if (frac < 0) frac = 0;
51			else if (frac > 1) frac = 1;
52			nchars = do_prog*frac + .5;
53			pbar[0] = '\r';
54			memset(pbar+1, '*', nchars);
55			memset(pbar+1+nchars, '-', do_prog-nchars);
56			pbar[do_prog+1] = '\0';
57			fputs(pbar, stderr);
58			}
59
60			/* Finish progress bar */
61	greg	2.27	static void
62			prog_done(void)
63			{
64			int n = do_prog;
65
66			if (n <= 1) return;
67			fputc('\r', stderr);
68			while (n--)
69			fputc(' ', stderr);
70			fputc('\r', stderr);
71			}
72	greg	2.1
73	greg	2.11	/* Output XML prologue to stdout */
74			static void
75			xml_prologue(int ac, char *av[])
76			{
77			puts("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
78			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\">");
79			fputs("<!-- File produced by:", stdout);
80			while (ac-- > 0) {
81			fputc(' ', stdout);
82			fputs(*av++, stdout);
83			}
84			puts(" -->");
85			puts("<WindowElementType>System</WindowElementType>");
86			puts("<FileType>BSDF</FileType>");
87			puts("<Optical>");
88			puts("<Layer>");
89			puts("\t<Material>");
90	greg	2.21	printf("\t\t<Name>%s</Name>\n", bsdf_name[0] ? bsdf_name : "Unknown");
91			printf("\t\t<Manufacturer>%s</Manufacturer>\n",
92			bsdf_manuf[0] ? bsdf_manuf : "Unknown");
93	greg	2.11	puts("\t\t<DeviceType>Other</DeviceType>");
94			puts("\t</Material>");
95			puts("\t<DataDefinition>");
96			printf("\t\t<IncidentDataStructure>TensorTree%c</IncidentDataStructure>\n",
97			single_plane_incident ? '3' : '4');
98			puts("\t</DataDefinition>");
99			}
100
101			/* Output XML data prologue to stdout */
102			static void
103			data_prologue()
104			{
105			static const char *bsdf_type[4] = {
106			"Reflection Front",
107			"Transmission Front",
108			"Transmission Back",
109			"Reflection Back"
110			};
111
112			puts("\t<WavelengthData>");
113			puts("\t\t<LayerNumber>System</LayerNumber>");
114			puts("\t\t<Wavelength unit=\"Integral\">Visible</Wavelength>");
115			puts("\t\t<SourceSpectrum>CIE Illuminant D65 1nm.ssp</SourceSpectrum>");
116			puts("\t\t<DetectorSpectrum>ASTM E308 1931 Y.dsp</DetectorSpectrum>");
117			puts("\t\t<WavelengthDataBlock>");
118			printf("\t\t\t<WavelengthDataDirection>%s</WavelengthDataDirection>\n",
119			bsdf_type[(input_orient>0)<<1 \| (output_orient>0)]);
120			puts("\t\t\t<AngleBasis>LBNL/Shirley-Chiu</AngleBasis>");
121			puts("\t\t\t<ScatteringDataType>BTDF</ScatteringDataType>");
122			puts("\t\t\t<ScatteringData>");
123			}
124
125			/* Output XML data epilogue to stdout */
126			static void
127			data_epilogue(void)
128			{
129			puts("\t\t\t</ScatteringData>");
130			puts("\t\t</WavelengthDataBlock>");
131			puts("\t</WavelengthData>");
132			}
133
134			/* Output XML epilogue to stdout */
135			static void
136			xml_epilogue(void)
137			{
138			puts("</Layer>");
139			puts("</Optical>");
140			puts("</WindowElement>");
141			}
142
143	greg	2.15	/* Compute absolute relative difference */
144			static double
145			abs_diff(double v1, double v0)
146			{
147			if ((v0 < 0) \| (v1 < 0))
148			return(.0);
149			v1 = (v1-v0)*2./(v0+v1+.0001);
150			if (v1 < 0)
151			return(-v1);
152			return(v1);
153			}
154
155	greg	2.1	/* Interpolate and output isotropic BSDF data */
156			static void
157	greg	2.11	eval_isotropic(char *funame)
158	greg	2.1	{
159			const int sqres = 1<<samp_order;
160			FILE *ofp = NULL;
161	greg	2.17	int assignD = 0;
162	greg	2.1	char cmd[128];
163			int ix, ox, oy;
164	greg	2.11	double iovec[6];
165	greg	2.4	float bsdf;
166	greg	2.15
167	greg	2.11	data_prologue(); /* begin output */
168			if (pctcull >= 0) {
169	greg	2.20	sprintf(cmd, "rttree_reduce -a -h -ff -r 3 -t %f -g %d",
170	greg	2.1	pctcull, samp_order);
171			fflush(stdout);
172			ofp = popen(cmd, "w");
173			if (ofp == NULL) {
174			fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
175			progname);
176			exit(1);
177			}
178			SET_FILE_BINARY(ofp);
179	greg	2.25	#ifdef getc_unlocked /* avoid lock/unlock overhead */
180			flockfile(ofp);
181			#endif
182	greg	2.1	} else
183			fputs("{\n", stdout);
184	greg	2.17	/* need to assign Dx, Dy, Dz? */
185			if (funame != NULL)
186			assignD = (fundefined(funame) < 6);
187	greg	2.1	/* run through directions */
188			for (ix = 0; ix < sqres/2; ix++) {
189	greg	2.11	RBFNODE *rbf = NULL;
190	greg	2.14	iovec[0] = 2.*(ix+.5)/sqres - 1.;
191	greg	2.11	iovec[1] = .0;
192			iovec[2] = input_orient * sqrt(1. - iovec[0]*iovec[0]);
193			if (funame == NULL)
194	greg	2.18	rbf = advect_rbf(iovec, lobe_lim);
195	greg	2.15	for (ox = 0; ox < sqres; ox++) {
196			float last_bsdf = -1;
197	greg	2.1	for (oy = 0; oy < sqres; oy++) {
198	greg	2.11	SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres);
199			iovec[5] = output_orient *
200			sqrt(1. - iovec[3]iovec[3] - iovec[4]iovec[4]);
201			if (funame == NULL)
202	greg	2.15	bsdf = eval_rbfrep(rbf, iovec+3) *
203	greg	2.11	output_orient/iovec[5];
204	greg	2.15	else {
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	greg	2.28	#if (NSSAMP > 0)
213	greg	2.15	if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
214	greg	2.28	int ssi;
215			double ssa[3], ssvec[6], sum = 0;
216			/* super-sample voxel */
217			for (ssi = NSSAMP; ssi--; ) {
218			SDmultiSamp(ssa, 3, (ssi+frandom()) *
219			(1./NSSAMP));
220	greg	2.15	ssvec[0] = 2.*(ix+ssa[0])/sqres - 1.;
221			ssvec[1] = .0;
222			ssvec[2] = input_orient *
223			sqrt(1. - ssvec[0]*ssvec[0]);
224			SDsquare2disk(ssvec+3, (ox+ssa[1])/sqres,
225			(oy+ssa[2])/sqres);
226			ssvec[5] = output_orient *
227			sqrt(1. - ssvec[3]*ssvec[3] -
228			ssvec[4]*ssvec[4]);
229	greg	2.17	if (assignD) {
230	greg	2.28	varset("Dx", '=', -ssvec[3]);
231			varset("Dy", '=', -ssvec[4]);
232			varset("Dz", '=', -ssvec[5]);
233	greg	2.17	++eclock;
234			}
235	greg	2.16	sum += funvalue(funame, 6, ssvec);
236	greg	2.15	}
237	greg	2.28	bsdf = sum/NSSAMP;
238	greg	2.15	}
239	greg	2.28	#endif
240	greg	2.15	}
241	greg	2.1	if (pctcull >= 0)
242			fwrite(&bsdf, sizeof(bsdf), 1, ofp);
243			else
244			printf("\t%.3e\n", bsdf);
245	greg	2.15	last_bsdf = bsdf;
246	greg	2.1	}
247	greg	2.15	}
248	greg	2.3	if (rbf != NULL)
249			free(rbf);
250	greg	2.26	prog_show((ix+1.)*(2./sqres));
251	greg	2.1	}
252			if (pctcull >= 0) { /* finish output */
253			if (pclose(ofp)) {
254			fprintf(stderr, "%s: error running '%s'\n",
255			progname, cmd);
256			exit(1);
257			}
258			} else {
259			for (ix = sqressqressqres/2; ix--; )
260			fputs("\t0\n", stdout);
261			fputs("}\n", stdout);
262			}
263	greg	2.11	data_epilogue();
264	greg	2.26	prog_done();
265	greg	2.1	}
266
267			/* Interpolate and output anisotropic BSDF data */
268			static void
269	greg	2.11	eval_anisotropic(char *funame)
270	greg	2.1	{
271			const int sqres = 1<<samp_order;
272			FILE *ofp = NULL;
273	greg	2.17	int assignD = 0;
274	greg	2.1	char cmd[128];
275			int ix, iy, ox, oy;
276	greg	2.11	double iovec[6];
277	greg	2.4	float bsdf;
278	greg	2.15
279	greg	2.11	data_prologue(); /* begin output */
280			if (pctcull >= 0) {
281	greg	2.19	sprintf(cmd, "rttree_reduce%s -h -ff -r 4 -t %f -g %d",
282			(input_orient>0 ^ output_orient>0) ? "" : " -a",
283	greg	2.1	pctcull, samp_order);
284			fflush(stdout);
285			ofp = popen(cmd, "w");
286			if (ofp == NULL) {
287			fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
288			progname);
289			exit(1);
290			}
291	greg	2.25	SET_FILE_BINARY(ofp);
292			#ifdef getc_unlocked /* avoid lock/unlock overhead */
293			flockfile(ofp);
294			#endif
295	greg	2.1	} else
296			fputs("{\n", stdout);
297	greg	2.17	/* need to assign Dx, Dy, Dz? */
298			if (funame != NULL)
299			assignD = (fundefined(funame) < 6);
300	greg	2.1	/* run through directions */
301			for (ix = 0; ix < sqres; ix++)
302			for (iy = 0; iy < sqres; iy++) {
303	greg	2.11	RBFNODE rbf = NULL; / Klems reversal */
304	greg	2.15	SDsquare2disk(iovec, 1.-(ix+.5)/sqres, 1.-(iy+.5)/sqres);
305	greg	2.11	iovec[2] = input_orient *
306			sqrt(1. - iovec[0]iovec[0] - iovec[1]iovec[1]);
307			if (funame == NULL)
308	greg	2.18	rbf = advect_rbf(iovec, lobe_lim);
309	greg	2.15	for (ox = 0; ox < sqres; ox++) {
310			float last_bsdf = -1;
311	greg	2.1	for (oy = 0; oy < sqres; oy++) {
312	greg	2.11	SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres);
313			iovec[5] = output_orient *
314			sqrt(1. - iovec[3]iovec[3] - iovec[4]iovec[4]);
315			if (funame == NULL)
316	greg	2.15	bsdf = eval_rbfrep(rbf, iovec+3) *
317	greg	2.11	output_orient/iovec[5];
318	greg	2.15	else {
319	greg	2.17	if (assignD) {
320			varset("Dx", '=', -iovec[3]);
321			varset("Dy", '=', -iovec[4]);
322			varset("Dz", '=', -iovec[5]);
323			++eclock;
324			}
325	greg	2.15	bsdf = funvalue(funame, 6, iovec);
326	greg	2.28	#if (NSSAMP > 0)
327	greg	2.15	if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
328	greg	2.28	int ssi;
329			double ssa[4], ssvec[6], sum = 0;
330			/* super-sample voxel */
331			for (ssi = NSSAMP; ssi--; ) {
332			SDmultiSamp(ssa, 4, (ssi+frandom()) *
333			(1./NSSAMP));
334	greg	2.15	SDsquare2disk(ssvec, 1.-(ix+ssa[0])/sqres,
335			1.-(iy+ssa[1])/sqres);
336	greg	2.28	ssvec[2] = input_orient *
337	greg	2.15	sqrt(1. - ssvec[0]*ssvec[0] -
338			ssvec[1]*ssvec[1]);
339			SDsquare2disk(ssvec+3, (ox+ssa[2])/sqres,
340			(oy+ssa[3])/sqres);
341			ssvec[5] = output_orient *
342			sqrt(1. - ssvec[3]*ssvec[3] -
343			ssvec[4]*ssvec[4]);
344	greg	2.17	if (assignD) {
345	greg	2.28	varset("Dx", '=', -ssvec[3]);
346			varset("Dy", '=', -ssvec[4]);
347			varset("Dz", '=', -ssvec[5]);
348	greg	2.17	++eclock;
349			}
350	greg	2.16	sum += funvalue(funame, 6, ssvec);
351	greg	2.15	}
352	greg	2.28	bsdf = sum/NSSAMP;
353	greg	2.15	}
354	greg	2.28	#endif
355	greg	2.15	}
356	greg	2.1	if (pctcull >= 0)
357			fwrite(&bsdf, sizeof(bsdf), 1, ofp);
358			else
359			printf("\t%.3e\n", bsdf);
360	greg	2.15	last_bsdf = bsdf;
361	greg	2.1	}
362	greg	2.15	}
363	greg	2.3	if (rbf != NULL)
364			free(rbf);
365	greg	2.26	prog_show((ixsqres+iy+1.)/(sqressqres));
366	greg	2.1	}
367			if (pctcull >= 0) { /* finish output */
368			if (pclose(ofp)) {
369			fprintf(stderr, "%s: error running '%s'\n",
370			progname, cmd);
371			exit(1);
372			}
373			} else
374			fputs("}\n", stdout);
375	greg	2.11	data_epilogue();
376	greg	2.26	prog_done();
377	greg	2.5	}
378
379	greg	2.1	/* Read in BSDF and interpolate as tensor tree representation */
380			int
381			main(int argc, char *argv[])
382			{
383	greg	2.11	int dofwd = 0, dobwd = 1;
384			int i, na;
385	greg	2.1
386	greg	2.5	progname = argv[0];
387	greg	2.11	esupport \|= E_VARIABLE\|E_FUNCTION\|E_RCONST;
388			esupport &= ~(E_INCHAN\|E_OUTCHAN);
389			scompile("PI:3.14159265358979323846", NULL, 0);
390			biggerlib();
391			for (i = 1; i < argc-1 && (argv[i][0] == '-') \| (argv[i][0] == '+'); i++)
392			switch (argv[i][1]) { /* get options */
393			case 'e':
394			scompile(argv[++i], NULL, 0);
395			break;
396			case 'f':
397			if (!argv[i][2])
398			fcompile(argv[++i]);
399			else
400			dofwd = (argv[i][0] == '+');
401			break;
402			case 'b':
403			dobwd = (argv[i][0] == '+');
404			break;
405	greg	2.1	case 't':
406	greg	2.11	switch (argv[i][2]) {
407			case '3':
408	greg	2.13	single_plane_incident = 1;
409	greg	2.11	break;
410			case '4':
411	greg	2.13	single_plane_incident = 0;
412	greg	2.11	break;
413			case '\0':
414			pctcull = atof(argv[++i]);
415			break;
416			default:
417			goto userr;
418			}
419	greg	2.1	break;
420			case 'g':
421	greg	2.5	samp_order = atoi(argv[++i]);
422	greg	2.1	break;
423	greg	2.18	case 'l':
424			lobe_lim = atoi(argv[++i]);
425			break;
426	greg	2.26	case 'p':
427			do_prog = atoi(argv[i]+2);
428			break;
429	greg	2.1	default:
430			goto userr;
431			}
432	greg	2.11	if (single_plane_incident >= 0) { /* function-based BSDF? */
433			void (evf)(char s) = single_plane_incident ?
434			&eval_isotropic : &eval_anisotropic;
435	greg	2.17	if (i != argc-1 \|\| fundefined(argv[i]) < 3) {
436	greg	2.12	fprintf(stderr,
437			"%s: need single function with 6 arguments: bsdf(ix,iy,iz,ox,oy,oz)\n",
438			progname);
439	greg	2.24	fprintf(stderr, "\tor 3 arguments using Dx,Dy,Dz: bsdf(ix,iy,iz)\n");
440	greg	2.11	goto userr;
441	greg	2.12	}
442	greg	2.17	++eclock;
443	greg	2.11	xml_prologue(argc, argv); /* start XML output */
444			if (dofwd) {
445			input_orient = -1;
446			output_orient = -1;
447	greg	2.26	prog_start("Evaluating outside reflectance");
448			(*evf)(argv[i]);
449	greg	2.11	output_orient = 1;
450	greg	2.26	prog_start("Evaluating outside->inside transmission");
451			(*evf)(argv[i]);
452	greg	2.11	}
453			if (dobwd) {
454			input_orient = 1;
455			output_orient = 1;
456	greg	2.26	prog_start("Evaluating inside reflectance");
457			(*evf)(argv[i]);
458	greg	2.11	output_orient = -1;
459	greg	2.26	prog_start("Evaluating inside->outside transmission");
460			(*evf)(argv[i]);
461	greg	2.11	}
462			xml_epilogue(); /* finish XML output & exit */
463			return(0);
464			}
465			if (i < argc) { /* open input files if given */
466	greg	2.12	int nbsdf = 0;
467	greg	2.11	for ( ; i < argc; i++) { /* interpolate each component */
468	greg	2.26	char pbuf[256];
469	greg	2.11	FILE *fpin = fopen(argv[i], "rb");
470			if (fpin == NULL) {
471			fprintf(stderr, "%s: cannot open BSDF interpolant '%s'\n",
472			progname, argv[i]);
473			return(1);
474			}
475			if (!load_bsdf_rep(fpin))
476			return(1);
477			fclose(fpin);
478	greg	2.12	if (!nbsdf++) /* start XML on first dist. */
479			xml_prologue(argc, argv);
480	greg	2.26	sprintf(pbuf, "Interpolating component '%s'", argv[i]);
481			prog_start(pbuf);
482	greg	2.11	if (single_plane_incident)
483			eval_isotropic(NULL);
484			else
485			eval_anisotropic(NULL);
486			}
487			xml_epilogue(); /* finish XML output & exit */
488			return(0);
489			}
490			SET_FILE_BINARY(stdin); /* load from stdin */
491			if (!load_bsdf_rep(stdin))
492	greg	2.1	return(1);
493	greg	2.5	xml_prologue(argc, argv); /* start XML output */
494	greg	2.26	prog_start("Interpolating from standard input");
495	greg	2.1	if (single_plane_incident) /* resample dist. */
496	greg	2.11	eval_isotropic(NULL);
497	greg	2.1	else
498	greg	2.11	eval_anisotropic(NULL);
499			xml_epilogue(); /* finish XML output & exit */
500	greg	2.1	return(0);
501			userr:
502			fprintf(stderr,
503	greg	2.18	"Usage: %s [-g Nlog2][-t pctcull][-l maxlobes] [bsdf.sir ..] > bsdf.xml\n",
504	greg	2.11	progname);
505			fprintf(stderr,
506			" or: %s -t{3\|4} [-g Nlog2][-t pctcull][{+\|-}for[ward]][{+\|-}b[ackward]][-e expr][-f file] bsdf_func > bsdf.xml\n",
507	greg	2.1	progname);
508			return(1);
509			}