src/cv/bsdf2ttree.c

#ifndef lint
static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.24 2014/03/08 01:05:00 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;

/* 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);
        }
        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();
}

/* 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);
            }
        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();
}

/* 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;
                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;
                        (*evf)(argv[i]);        /* outside reflectance */
                        output_orient = 1;
                        (*evf)(argv[i]);        /* outside -> inside */
                }
                if (dobwd) {
                        input_orient = 1;
                        output_orient = 1;
                        (*evf)(argv[i]);        /* inside reflectance */
                        output_orient = -1;
                        (*evf)(argv[i]);        /* inside -> outside */
                }
                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 */
                        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);
                        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 */
        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:	2.25
Committed:	Tue Mar 11 19:37:45 2014 UTC (10 years, 1 month ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.24:	+8 -1 lines
Log Message:	Added flockfile calls to reduce i/o overhead
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.25	static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.24 2014/03/08 01:05:00 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	2.1
32	greg	2.11	/* Output XML prologue to stdout */
33			static void
34			xml_prologue(int ac, char *av[])
35			{
36			puts("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
37			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\">");
38			fputs("<!-- File produced by:", stdout);
39			while (ac-- > 0) {
40			fputc(' ', stdout);
41			fputs(*av++, stdout);
42			}
43			puts(" -->");
44			puts("<WindowElementType>System</WindowElementType>");
45			puts("<FileType>BSDF</FileType>");
46			puts("<Optical>");
47			puts("<Layer>");
48			puts("\t<Material>");
49	greg	2.21	printf("\t\t<Name>%s</Name>\n", bsdf_name[0] ? bsdf_name : "Unknown");
50			printf("\t\t<Manufacturer>%s</Manufacturer>\n",
51			bsdf_manuf[0] ? bsdf_manuf : "Unknown");
52	greg	2.11	puts("\t\t<DeviceType>Other</DeviceType>");
53			puts("\t</Material>");
54			puts("\t<DataDefinition>");
55			printf("\t\t<IncidentDataStructure>TensorTree%c</IncidentDataStructure>\n",
56			single_plane_incident ? '3' : '4');
57			puts("\t</DataDefinition>");
58			}
59
60			/* Output XML data prologue to stdout */
61			static void
62			data_prologue()
63			{
64			static const char *bsdf_type[4] = {
65			"Reflection Front",
66			"Transmission Front",
67			"Transmission Back",
68			"Reflection Back"
69			};
70
71			puts("\t<WavelengthData>");
72			puts("\t\t<LayerNumber>System</LayerNumber>");
73			puts("\t\t<Wavelength unit=\"Integral\">Visible</Wavelength>");
74			puts("\t\t<SourceSpectrum>CIE Illuminant D65 1nm.ssp</SourceSpectrum>");
75			puts("\t\t<DetectorSpectrum>ASTM E308 1931 Y.dsp</DetectorSpectrum>");
76			puts("\t\t<WavelengthDataBlock>");
77			printf("\t\t\t<WavelengthDataDirection>%s</WavelengthDataDirection>\n",
78			bsdf_type[(input_orient>0)<<1 \| (output_orient>0)]);
79			puts("\t\t\t<AngleBasis>LBNL/Shirley-Chiu</AngleBasis>");
80			puts("\t\t\t<ScatteringDataType>BTDF</ScatteringDataType>");
81			puts("\t\t\t<ScatteringData>");
82			}
83
84			/* Output XML data epilogue to stdout */
85			static void
86			data_epilogue(void)
87			{
88			puts("\t\t\t</ScatteringData>");
89			puts("\t\t</WavelengthDataBlock>");
90			puts("\t</WavelengthData>");
91			}
92
93			/* Output XML epilogue to stdout */
94			static void
95			xml_epilogue(void)
96			{
97			puts("</Layer>");
98			puts("</Optical>");
99			puts("</WindowElement>");
100			}
101
102	greg	2.15	/* Compute absolute relative difference */
103			static double
104			abs_diff(double v1, double v0)
105			{
106			if ((v0 < 0) \| (v1 < 0))
107			return(.0);
108			v1 = (v1-v0)*2./(v0+v1+.0001);
109			if (v1 < 0)
110			return(-v1);
111			return(v1);
112			}
113
114	greg	2.1	/* Interpolate and output isotropic BSDF data */
115			static void
116	greg	2.11	eval_isotropic(char *funame)
117	greg	2.1	{
118			const int sqres = 1<<samp_order;
119			FILE *ofp = NULL;
120	greg	2.17	int assignD = 0;
121	greg	2.1	char cmd[128];
122			int ix, ox, oy;
123	greg	2.11	double iovec[6];
124	greg	2.4	float bsdf;
125	greg	2.15
126	greg	2.11	data_prologue(); /* begin output */
127			if (pctcull >= 0) {
128	greg	2.20	sprintf(cmd, "rttree_reduce -a -h -ff -r 3 -t %f -g %d",
129	greg	2.1	pctcull, samp_order);
130			fflush(stdout);
131			ofp = popen(cmd, "w");
132			if (ofp == NULL) {
133			fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
134			progname);
135			exit(1);
136			}
137			SET_FILE_BINARY(ofp);
138	greg	2.25	#ifdef getc_unlocked /* avoid lock/unlock overhead */
139			flockfile(ofp);
140			#endif
141	greg	2.1	} else
142			fputs("{\n", stdout);
143	greg	2.17	/* need to assign Dx, Dy, Dz? */
144			if (funame != NULL)
145			assignD = (fundefined(funame) < 6);
146	greg	2.1	/* run through directions */
147			for (ix = 0; ix < sqres/2; ix++) {
148	greg	2.11	RBFNODE *rbf = NULL;
149	greg	2.14	iovec[0] = 2.*(ix+.5)/sqres - 1.;
150	greg	2.11	iovec[1] = .0;
151			iovec[2] = input_orient * sqrt(1. - iovec[0]*iovec[0]);
152			if (funame == NULL)
153	greg	2.18	rbf = advect_rbf(iovec, lobe_lim);
154	greg	2.15	for (ox = 0; ox < sqres; ox++) {
155			float last_bsdf = -1;
156	greg	2.1	for (oy = 0; oy < sqres; oy++) {
157	greg	2.11	SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres);
158			iovec[5] = output_orient *
159			sqrt(1. - iovec[3]iovec[3] - iovec[4]iovec[4]);
160			if (funame == NULL)
161	greg	2.15	bsdf = eval_rbfrep(rbf, iovec+3) *
162	greg	2.11	output_orient/iovec[5];
163	greg	2.15	else {
164	greg	2.16	double ssa[3], ssvec[6], sum;
165	greg	2.15	int ssi;
166	greg	2.17	if (assignD) {
167			varset("Dx", '=', -iovec[3]);
168			varset("Dy", '=', -iovec[4]);
169			varset("Dz", '=', -iovec[5]);
170			++eclock;
171			}
172	greg	2.15	bsdf = funvalue(funame, 6, iovec);
173			if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
174	greg	2.16	sum = 0; /* super-sample voxel */
175	greg	2.15	for (ssi = nssamp; ssi--; ) {
176	greg	2.23	SDmultiSamp(ssa, 3, (ssi+frandom())/nssamp);
177	greg	2.15	ssvec[0] = 2.*(ix+ssa[0])/sqres - 1.;
178			ssvec[1] = .0;
179			ssvec[2] = input_orient *
180			sqrt(1. - ssvec[0]*ssvec[0]);
181			SDsquare2disk(ssvec+3, (ox+ssa[1])/sqres,
182			(oy+ssa[2])/sqres);
183			ssvec[5] = output_orient *
184			sqrt(1. - ssvec[3]*ssvec[3] -
185			ssvec[4]*ssvec[4]);
186	greg	2.17	if (assignD) {
187			varset("Dx", '=', -iovec[3]);
188			varset("Dy", '=', -iovec[4]);
189			varset("Dz", '=', -iovec[5]);
190			++eclock;
191			}
192	greg	2.16	sum += funvalue(funame, 6, ssvec);
193	greg	2.15	}
194	greg	2.16	bsdf = sum/nssamp;
195	greg	2.15	}
196			}
197	greg	2.1	if (pctcull >= 0)
198			fwrite(&bsdf, sizeof(bsdf), 1, ofp);
199			else
200			printf("\t%.3e\n", bsdf);
201	greg	2.15	last_bsdf = bsdf;
202	greg	2.1	}
203	greg	2.15	}
204	greg	2.3	if (rbf != NULL)
205			free(rbf);
206	greg	2.1	}
207			if (pctcull >= 0) { /* finish output */
208			if (pclose(ofp)) {
209			fprintf(stderr, "%s: error running '%s'\n",
210			progname, cmd);
211			exit(1);
212			}
213			} else {
214			for (ix = sqressqressqres/2; ix--; )
215			fputs("\t0\n", stdout);
216			fputs("}\n", stdout);
217			}
218	greg	2.11	data_epilogue();
219	greg	2.1	}
220
221			/* Interpolate and output anisotropic BSDF data */
222			static void
223	greg	2.11	eval_anisotropic(char *funame)
224	greg	2.1	{
225			const int sqres = 1<<samp_order;
226			FILE *ofp = NULL;
227	greg	2.17	int assignD = 0;
228	greg	2.1	char cmd[128];
229			int ix, iy, ox, oy;
230	greg	2.11	double iovec[6];
231	greg	2.4	float bsdf;
232	greg	2.15
233	greg	2.11	data_prologue(); /* begin output */
234			if (pctcull >= 0) {
235	greg	2.19	sprintf(cmd, "rttree_reduce%s -h -ff -r 4 -t %f -g %d",
236			(input_orient>0 ^ output_orient>0) ? "" : " -a",
237	greg	2.1	pctcull, samp_order);
238			fflush(stdout);
239			ofp = popen(cmd, "w");
240			if (ofp == NULL) {
241			fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
242			progname);
243			exit(1);
244			}
245	greg	2.25	SET_FILE_BINARY(ofp);
246			#ifdef getc_unlocked /* avoid lock/unlock overhead */
247			flockfile(ofp);
248			#endif
249	greg	2.1	} else
250			fputs("{\n", stdout);
251	greg	2.17	/* need to assign Dx, Dy, Dz? */
252			if (funame != NULL)
253			assignD = (fundefined(funame) < 6);
254	greg	2.1	/* run through directions */
255			for (ix = 0; ix < sqres; ix++)
256			for (iy = 0; iy < sqres; iy++) {
257	greg	2.11	RBFNODE rbf = NULL; / Klems reversal */
258	greg	2.15	SDsquare2disk(iovec, 1.-(ix+.5)/sqres, 1.-(iy+.5)/sqres);
259	greg	2.11	iovec[2] = input_orient *
260			sqrt(1. - iovec[0]iovec[0] - iovec[1]iovec[1]);
261			if (funame == NULL)
262	greg	2.18	rbf = advect_rbf(iovec, lobe_lim);
263	greg	2.15	for (ox = 0; ox < sqres; ox++) {
264			float last_bsdf = -1;
265	greg	2.1	for (oy = 0; oy < sqres; oy++) {
266	greg	2.11	SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres);
267			iovec[5] = output_orient *
268			sqrt(1. - iovec[3]iovec[3] - iovec[4]iovec[4]);
269			if (funame == NULL)
270	greg	2.15	bsdf = eval_rbfrep(rbf, iovec+3) *
271	greg	2.11	output_orient/iovec[5];
272	greg	2.15	else {
273	greg	2.16	double ssa[4], ssvec[6], sum;
274	greg	2.15	int ssi;
275	greg	2.17	if (assignD) {
276			varset("Dx", '=', -iovec[3]);
277			varset("Dy", '=', -iovec[4]);
278			varset("Dz", '=', -iovec[5]);
279			++eclock;
280			}
281	greg	2.15	bsdf = funvalue(funame, 6, iovec);
282			if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
283	greg	2.16	sum = 0; /* super-sample voxel */
284	greg	2.15	for (ssi = nssamp; ssi--; ) {
285	greg	2.23	SDmultiSamp(ssa, 4, (ssi+frandom())/nssamp);
286	greg	2.15	SDsquare2disk(ssvec, 1.-(ix+ssa[0])/sqres,
287			1.-(iy+ssa[1])/sqres);
288			ssvec[2] = output_orient *
289			sqrt(1. - ssvec[0]*ssvec[0] -
290			ssvec[1]*ssvec[1]);
291			SDsquare2disk(ssvec+3, (ox+ssa[2])/sqres,
292			(oy+ssa[3])/sqres);
293			ssvec[5] = output_orient *
294			sqrt(1. - ssvec[3]*ssvec[3] -
295			ssvec[4]*ssvec[4]);
296	greg	2.17	if (assignD) {
297			varset("Dx", '=', -iovec[3]);
298			varset("Dy", '=', -iovec[4]);
299			varset("Dz", '=', -iovec[5]);
300			++eclock;
301			}
302	greg	2.16	sum += funvalue(funame, 6, ssvec);
303	greg	2.15	}
304	greg	2.16	bsdf = sum/nssamp;
305	greg	2.15	}
306			}
307	greg	2.1	if (pctcull >= 0)
308			fwrite(&bsdf, sizeof(bsdf), 1, ofp);
309			else
310			printf("\t%.3e\n", bsdf);
311	greg	2.15	last_bsdf = bsdf;
312	greg	2.1	}
313	greg	2.15	}
314	greg	2.3	if (rbf != NULL)
315			free(rbf);
316	greg	2.1	}
317			if (pctcull >= 0) { /* finish output */
318			if (pclose(ofp)) {
319			fprintf(stderr, "%s: error running '%s'\n",
320			progname, cmd);
321			exit(1);
322			}
323			} else
324			fputs("}\n", stdout);
325	greg	2.11	data_epilogue();
326	greg	2.5	}
327
328	greg	2.1	/* Read in BSDF and interpolate as tensor tree representation */
329			int
330			main(int argc, char *argv[])
331			{
332	greg	2.11	int dofwd = 0, dobwd = 1;
333			int i, na;
334	greg	2.1
335	greg	2.5	progname = argv[0];
336	greg	2.11	esupport \|= E_VARIABLE\|E_FUNCTION\|E_RCONST;
337			esupport &= ~(E_INCHAN\|E_OUTCHAN);
338			scompile("PI:3.14159265358979323846", NULL, 0);
339			biggerlib();
340			for (i = 1; i < argc-1 && (argv[i][0] == '-') \| (argv[i][0] == '+'); i++)
341			switch (argv[i][1]) { /* get options */
342			case 'e':
343			scompile(argv[++i], NULL, 0);
344			break;
345			case 'f':
346			if (!argv[i][2])
347			fcompile(argv[++i]);
348			else
349			dofwd = (argv[i][0] == '+');
350			break;
351			case 'b':
352			dobwd = (argv[i][0] == '+');
353			break;
354	greg	2.1	case 't':
355	greg	2.11	switch (argv[i][2]) {
356			case '3':
357	greg	2.13	single_plane_incident = 1;
358	greg	2.11	break;
359			case '4':
360	greg	2.13	single_plane_incident = 0;
361	greg	2.11	break;
362			case '\0':
363			pctcull = atof(argv[++i]);
364			break;
365			default:
366			goto userr;
367			}
368	greg	2.1	break;
369			case 'g':
370	greg	2.5	samp_order = atoi(argv[++i]);
371	greg	2.1	break;
372	greg	2.18	case 'l':
373			lobe_lim = atoi(argv[++i]);
374			break;
375	greg	2.1	default:
376			goto userr;
377			}
378	greg	2.11	if (single_plane_incident >= 0) { /* function-based BSDF? */
379			void (evf)(char s) = single_plane_incident ?
380			&eval_isotropic : &eval_anisotropic;
381	greg	2.17	if (i != argc-1 \|\| fundefined(argv[i]) < 3) {
382	greg	2.12	fprintf(stderr,
383			"%s: need single function with 6 arguments: bsdf(ix,iy,iz,ox,oy,oz)\n",
384			progname);
385	greg	2.24	fprintf(stderr, "\tor 3 arguments using Dx,Dy,Dz: bsdf(ix,iy,iz)\n");
386	greg	2.11	goto userr;
387	greg	2.12	}
388	greg	2.17	++eclock;
389	greg	2.11	xml_prologue(argc, argv); /* start XML output */
390			if (dofwd) {
391			input_orient = -1;
392			output_orient = -1;
393			(evf)(argv[i]); / outside reflectance */
394			output_orient = 1;
395			(evf)(argv[i]); / outside -> inside */
396			}
397			if (dobwd) {
398			input_orient = 1;
399			output_orient = 1;
400			(evf)(argv[i]); / inside reflectance */
401			output_orient = -1;
402			(evf)(argv[i]); / inside -> outside */
403			}
404			xml_epilogue(); /* finish XML output & exit */
405			return(0);
406			}
407			if (i < argc) { /* open input files if given */
408	greg	2.12	int nbsdf = 0;
409	greg	2.11	for ( ; i < argc; i++) { /* interpolate each component */
410			FILE *fpin = fopen(argv[i], "rb");
411			if (fpin == NULL) {
412			fprintf(stderr, "%s: cannot open BSDF interpolant '%s'\n",
413			progname, argv[i]);
414			return(1);
415			}
416			if (!load_bsdf_rep(fpin))
417			return(1);
418			fclose(fpin);
419	greg	2.12	if (!nbsdf++) /* start XML on first dist. */
420			xml_prologue(argc, argv);
421	greg	2.11	if (single_plane_incident)
422			eval_isotropic(NULL);
423			else
424			eval_anisotropic(NULL);
425			}
426			xml_epilogue(); /* finish XML output & exit */
427			return(0);
428			}
429			SET_FILE_BINARY(stdin); /* load from stdin */
430			if (!load_bsdf_rep(stdin))
431	greg	2.1	return(1);
432	greg	2.5	xml_prologue(argc, argv); /* start XML output */
433	greg	2.1	if (single_plane_incident) /* resample dist. */
434	greg	2.11	eval_isotropic(NULL);
435	greg	2.1	else
436	greg	2.11	eval_anisotropic(NULL);
437			xml_epilogue(); /* finish XML output & exit */
438	greg	2.1	return(0);
439			userr:
440			fprintf(stderr,
441	greg	2.18	"Usage: %s [-g Nlog2][-t pctcull][-l maxlobes] [bsdf.sir ..] > bsdf.xml\n",
442	greg	2.11	progname);
443			fprintf(stderr,
444			" or: %s -t{3\|4} [-g Nlog2][-t pctcull][{+\|-}for[ward]][{+\|-}b[ackward]][-e expr][-f file] bsdf_func > bsdf.xml\n",
445	greg	2.1	progname);
446			return(1);
447			}