src/cv/bsdf2ttree.c

#ifndef lint
static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.25 2014/03/11 19:37:45 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 */
#define prog_done()     if (do_prog) fputc('\n',stderr); else

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