1 // sg_binobj.cxx -- routines to read and write low level flightgear 3d objects
3 // Written by Curtis Olson, started January 2000.
5 // Copyright (C) 2000 Curtis L. Olson - http://www.flightgear.org/~curt
7 // This program is free software; you can redistribute it and/or modify
8 // it under the terms of the GNU General Public License as published by
9 // the Free Software Foundation; either version 2 of the License, or
10 // (at your option) any later version.
12 // This program is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
26 # include <simgear_config.h>
29 #include <simgear/compiler.h>
30 #include <simgear/debug/logstream.hxx>
35 #include <cstdlib> // for system()
43 #include <simgear/bucket/newbucket.hxx>
44 #include <simgear/misc/sg_path.hxx>
45 #include <simgear/math/SGGeometry.hxx>
46 #include <simgear/structure/exception.hxx>
48 #include "lowlevel.hxx"
49 #include "sg_binobj.hxx"
58 SG_BOUNDING_SPHERE = 0,
67 SG_TRIANGLE_FACES = 10,
68 SG_TRIANGLE_STRIPS = 11,
73 SG_IDX_VERTICES = 0x01,
74 SG_IDX_NORMALS = 0x02,
76 SG_IDX_TEXCOORDS = 0x08
79 enum sgPropertyTypes {
85 class sgSimpleBuffer {
94 sgSimpleBuffer( unsigned int s = 0) :
107 unsigned int get_size() const { return size; }
108 char *get_ptr() const { return ptr; }
115 void resize( unsigned int s )
129 ptr = new char[size];
135 double* p = reinterpret_cast<double*>(ptr + offset);
137 if ( sgIsBigEndian() ) {
138 sgEndianSwap((uint64_t *) p + 0);
139 sgEndianSwap((uint64_t *) p + 1);
140 sgEndianSwap((uint64_t *) p + 2);
143 offset += 3 * sizeof(double);
149 float* p = reinterpret_cast<float*>(ptr + offset);
150 if ( sgIsBigEndian() ) {
151 sgEndianSwap((uint32_t *) p);
154 offset += sizeof(float);
160 float* p = reinterpret_cast<float*>(ptr + offset);
162 if ( sgIsBigEndian() ) {
163 sgEndianSwap((uint32_t *) p + 0);
164 sgEndianSwap((uint32_t *) p + 1);
167 offset += 2 * sizeof(float);
173 float* p = reinterpret_cast<float*>(ptr + offset);
175 if ( sgIsBigEndian() ) {
176 sgEndianSwap((uint32_t *) p + 0);
177 sgEndianSwap((uint32_t *) p + 1);
178 sgEndianSwap((uint32_t *) p + 2);
181 offset += 3 * sizeof(float);
187 float* p = reinterpret_cast<float*>(ptr + offset);
189 if ( sgIsBigEndian() ) {
190 sgEndianSwap((uint32_t *) p + 0);
191 sgEndianSwap((uint32_t *) p + 1);
192 sgEndianSwap((uint32_t *) p + 2);
193 sgEndianSwap((uint32_t *) p + 3);
196 offset += 4 * sizeof(float);
202 static void read_indices(char* buffer,
210 const int indexSize = sizeof(T) * std::bitset<32>(indexMask).count();
211 const int count = bytes / indexSize;
213 // fix endian-ness of the whole lot, if required
214 if (sgIsBigEndian()) {
215 int indices = bytes / sizeof(T);
216 T* src = reinterpret_cast<T*>(buffer);
217 for (int i=0; i<indices; ++i) {
222 T* src = reinterpret_cast<T*>(buffer);
223 for (int i=0; i<count; ++i) {
224 if (indexMask & SG_IDX_VERTICES) vertices.push_back(*src++);
225 if (indexMask & SG_IDX_NORMALS) normals.push_back(*src++);
226 if (indexMask & SG_IDX_COLORS) colors.push_back(*src++);
227 if (indexMask & SG_IDX_TEXCOORDS) texCoords.push_back(*src++);
228 } // of elements in the index
232 void write_indice(gzFile fp, T value)
234 sgWriteBytes(fp, sizeof(T), &value);
237 // specialize template to call endian-aware conversion methods
239 void write_indice(gzFile fp, uint16_t value)
241 sgWriteUShort(fp, value);
245 void write_indice(gzFile fp, uint32_t value)
247 sgWriteUInt(fp, value);
252 void write_indices(gzFile fp, unsigned char indexMask,
253 const int_list& vertices,
254 const int_list& normals,
255 const int_list& colors,
256 const int_list& texCoords)
258 unsigned int count = vertices.size();
259 const int indexSize = sizeof(T) * std::bitset<32>(indexMask).count();
260 sgWriteUInt(fp, indexSize * count);
262 for (unsigned int i=0; i < count; ++i) {
263 write_indice(fp, static_cast<T>(vertices[i]));
265 if (indexMask & SG_IDX_NORMALS) {
266 write_indice(fp, static_cast<T>(normals[i]));
268 if (indexMask & SG_IDX_COLORS) {
269 write_indice(fp, static_cast<T>(colors[i]));
271 if (indexMask & SG_IDX_TEXCOORDS) {
272 write_indice(fp, static_cast<T>(texCoords[i]));
278 // read object properties
279 void SGBinObject::read_object( gzFile fp,
283 group_list& vertices,
286 group_list& texCoords,
287 string_list& materials)
290 unsigned char idx_mask;
292 sgSimpleBuffer buf( 32768 ); // 32 Kb
296 if ( obj_type == SG_POINTS ) {
297 idx_mask = SG_IDX_VERTICES;
299 idx_mask = (char)(SG_IDX_VERTICES | SG_IDX_TEXCOORDS);
302 for ( j = 0; j < nproperties; ++j ) {
304 sgReadChar( fp, &prop_type );
305 sgReadUInt( fp, &nbytes );
307 char *ptr = buf.get_ptr();
308 sgReadBytes( fp, nbytes, ptr );
309 if ( prop_type == SG_MATERIAL ) {
313 strncpy( material, ptr, nbytes );
314 material[nbytes] = '\0';
315 // cout << "material type = " << material << endl;
316 } else if ( prop_type == SG_INDEX_TYPES ) {
318 //cout << std::hex << "index mask:" << idx_mask << std::dec << endl;
322 if ( sgReadError() ) {
323 throw sg_exception("Error reading object properties");
326 size_t indexCount = std::bitset<32>(idx_mask).count();
327 if (indexCount == 0) {
328 throw sg_exception("object index mask has no bits set");
331 for ( j = 0; j < nelements; ++j ) {
332 sgReadUInt( fp, &nbytes );
333 if ( sgReadError() ) {
334 throw sg_exception("Error reading element size");
337 buf.resize( nbytes );
338 char *ptr = buf.get_ptr();
339 sgReadBytes( fp, nbytes, ptr );
341 if ( sgReadError() ) {
342 throw sg_exception("Error reading element bytes");
350 read_indices<uint32_t>(ptr, nbytes, idx_mask, vs, ns, cs, tcs);
352 read_indices<uint16_t>(ptr, nbytes, idx_mask, vs, ns, cs, tcs);
355 vertices.push_back( vs );
356 normals.push_back( ns );
357 colors.push_back( cs );
358 texCoords.push_back( tcs );
359 materials.push_back( material );
360 } // of element iteration
364 // read a binary file and populate the provided structures.
365 bool SGBinObject::read_bin( const string& file ) {
370 sgSimpleBuffer buf( 32768 ); // 32 Kb
372 // zero out structures
373 gbs_center = SGVec3d(0, 0, 0);
384 pt_materials.clear();
390 tri_materials.clear();
396 strip_materials.clear();
402 fan_materials.clear();
405 if ( (fp = gzopen( file.c_str(), "rb" )) == NULL ) {
406 string filegz = file + ".gz";
407 if ( (fp = gzopen( filegz.c_str(), "rb" )) == NULL ) {
408 SG_LOG( SG_EVENT, SG_ALERT,
409 "ERROR: opening " << file << " or " << filegz << " for reading!");
411 throw sg_io_exception("Error opening for reading (and .gz)", sg_location(file));
419 sgReadUInt( fp, &header );
420 if ( ((header & 0xFF000000) >> 24) == 'S' &&
421 ((header & 0x00FF0000) >> 16) == 'G' ) {
422 // cout << "Good header" << endl;
424 version = (header & 0x0000FFFF);
425 // cout << "File version = " << version << endl;
427 // close the file before we return
429 throw sg_io_exception("Bad BTG magic/version", sg_location(file));
432 // read creation time
433 unsigned int foo_calendar_time;
434 sgReadUInt( fp, &foo_calendar_time );
437 time_t calendar_time = foo_calendar_time;
438 // The following code has a global effect on the host application
439 // and can screws up the time elsewhere. It should be avoided
440 // unless you need this for debugging in which case you should
441 // disable it again once the debugging task is finished.
443 local_tm = localtime( &calendar_time );
445 strftime( time_str, 256, "%a %b %d %H:%M:%S %Z %Y", local_tm);
446 SG_LOG( SG_EVENT, SG_DEBUG, "File created on " << time_str);
449 // read number of top level objects
451 if ( version >= 10) { // version 10 extends everything to be 32-bit
452 sgReadInt( fp, &nobjects );
453 } else if ( version >= 7 ) {
455 sgReadUShort( fp, &v );
459 sgReadShort( fp, &v );
463 //cout << "Total objects to read = " << nobjects << endl;
465 if ( sgReadError() ) {
466 throw sg_io_exception("Error reading BTG file header", sg_location(file));
470 for ( i = 0; i < nobjects; ++i ) {
471 // read object header
473 uint32_t nproperties, nelements;
474 sgReadChar( fp, &obj_type );
475 if ( version >= 10 ) {
476 sgReadUInt( fp, &nproperties );
477 sgReadUInt( fp, &nelements );
478 } else if ( version >= 7 ) {
480 sgReadUShort( fp, &v );
482 sgReadUShort( fp, &v );
486 sgReadShort( fp, &v );
488 sgReadShort( fp, &v );
492 //cout << "object " << i << " = " << (int)obj_type << " props = "
493 // << nproperties << " elements = " << nelements << endl;
495 if ( obj_type == SG_BOUNDING_SPHERE ) {
496 // read bounding sphere properties
497 read_properties( fp, nproperties );
499 // read bounding sphere elements
500 for ( j = 0; j < nelements; ++j ) {
501 sgReadUInt( fp, &nbytes );
502 buf.resize( nbytes );
504 char *ptr = buf.get_ptr();
505 sgReadBytes( fp, nbytes, ptr );
506 gbs_center = buf.readVec3d();
507 gbs_radius = buf.readFloat();
509 } else if ( obj_type == SG_VERTEX_LIST ) {
510 // read vertex list properties
511 read_properties( fp, nproperties );
513 // read vertex list elements
514 for ( j = 0; j < nelements; ++j ) {
515 sgReadUInt( fp, &nbytes );
516 buf.resize( nbytes );
518 char *ptr = buf.get_ptr();
519 sgReadBytes( fp, nbytes, ptr );
520 int count = nbytes / (sizeof(float) * 3);
521 wgs84_nodes.reserve( count );
522 for ( k = 0; k < count; ++k ) {
523 SGVec3f v = buf.readVec3f();
524 // extend from float to double, hmmm
525 wgs84_nodes.push_back( SGVec3d(v[0], v[1], v[2]) );
528 } else if ( obj_type == SG_COLOR_LIST ) {
529 // read color list properties
530 read_properties( fp, nproperties );
532 // read color list elements
533 for ( j = 0; j < nelements; ++j ) {
534 sgReadUInt( fp, &nbytes );
535 buf.resize( nbytes );
537 char *ptr = buf.get_ptr();
538 sgReadBytes( fp, nbytes, ptr );
539 int count = nbytes / (sizeof(float) * 4);
540 colors.reserve(count);
541 for ( k = 0; k < count; ++k ) {
542 colors.push_back( buf.readVec4f() );
545 } else if ( obj_type == SG_NORMAL_LIST ) {
546 // read normal list properties
547 read_properties( fp, nproperties );
549 // read normal list elements
550 for ( j = 0; j < nelements; ++j ) {
551 sgReadUInt( fp, &nbytes );
552 buf.resize( nbytes );
554 unsigned char *ptr = (unsigned char *)(buf.get_ptr());
555 sgReadBytes( fp, nbytes, ptr );
556 int count = nbytes / 3;
557 normals.reserve( count );
559 for ( k = 0; k < count; ++k ) {
560 SGVec3f normal( (ptr[0]) / 127.5 - 1.0,
561 (ptr[1]) / 127.5 - 1.0,
562 (ptr[2]) / 127.5 - 1.0);
563 normals.push_back(normalize(normal));
567 } else if ( obj_type == SG_TEXCOORD_LIST ) {
568 // read texcoord list properties
569 read_properties( fp, nproperties );
571 // read texcoord list elements
572 for ( j = 0; j < nelements; ++j ) {
573 sgReadUInt( fp, &nbytes );
574 buf.resize( nbytes );
576 char *ptr = buf.get_ptr();
577 sgReadBytes( fp, nbytes, ptr );
578 int count = nbytes / (sizeof(float) * 2);
579 texcoords.reserve(count);
580 for ( k = 0; k < count; ++k ) {
581 texcoords.push_back( buf.readVec2f() );
584 } else if ( obj_type == SG_POINTS ) {
585 // read point elements
586 read_object( fp, SG_POINTS, nproperties, nelements,
587 pts_v, pts_n, pts_c, pts_tc, pt_materials );
588 } else if ( obj_type == SG_TRIANGLE_FACES ) {
589 // read triangle face properties
590 read_object( fp, SG_TRIANGLE_FACES, nproperties, nelements,
591 tris_v, tris_n, tris_c, tris_tc, tri_materials );
592 } else if ( obj_type == SG_TRIANGLE_STRIPS ) {
593 // read triangle strip properties
594 read_object( fp, SG_TRIANGLE_STRIPS, nproperties, nelements,
595 strips_v, strips_n, strips_c, strips_tc,
597 } else if ( obj_type == SG_TRIANGLE_FANS ) {
598 // read triangle fan properties
599 read_object( fp, SG_TRIANGLE_FANS, nproperties, nelements,
600 fans_v, fans_n, fans_c, fans_tc, fan_materials );
602 // unknown object type, just skip
603 read_properties( fp, nproperties );
606 for ( j = 0; j < nelements; ++j ) {
607 sgReadUInt( fp, &nbytes );
608 // cout << "element size = " << nbytes << endl;
609 if ( nbytes > buf.get_size() ) { buf.resize( nbytes ); }
610 char *ptr = buf.get_ptr();
611 sgReadBytes( fp, nbytes, ptr );
615 if ( sgReadError() ) {
616 throw sg_io_exception("Error while reading object", sg_location(file, i));
626 void SGBinObject::write_header(gzFile fp, int type, int nProps, int nElements)
628 sgWriteChar(fp, (unsigned char) type);
630 sgWriteUShort(fp, nProps);
631 sgWriteUShort(fp, nElements);
633 sgWriteUInt(fp, nProps);
634 sgWriteUInt(fp, nElements);
638 unsigned int SGBinObject::count_objects(const string_list& materials)
640 unsigned int result = 0;
641 unsigned int start = 0, end = 1;
642 unsigned int count = materials.size();
645 while ( start < count ) {
646 m = materials[start];
647 for (end = start+1; (end < count) && (m == materials[end]); ++end) { }
655 void SGBinObject::write_objects(gzFile fp, int type, const group_list& verts,
656 const group_list& normals, const group_list& colors,
657 const group_list& texCoords, const string_list& materials)
663 unsigned int start = 0, end = 1;
667 while (start < materials.size()) {
668 m = materials[start];
669 // find range of objects with identical material, write out as a single object
670 for (end = start+1; (end < materials.size()) && (m == materials[end]); ++end) {}
672 const int count = end - start;
673 write_header(fp, type, 2, count);
676 sgWriteChar( fp, (char)SG_MATERIAL ); // property
677 sgWriteUInt( fp, m.length() ); // nbytes
678 sgWriteBytes( fp, m.length(), m.c_str() );
680 unsigned char idx_mask = 0;
681 if ( !verts.empty() && !verts.front().empty()) idx_mask |= SG_IDX_VERTICES;
682 if ( !normals.empty() && !normals.front().empty()) idx_mask |= SG_IDX_NORMALS;
683 if ( !colors.empty() && !colors.front().empty()) idx_mask |= SG_IDX_COLORS;
684 if ( !texCoords.empty() && !texCoords.front().empty()) idx_mask |= SG_IDX_TEXCOORDS;
687 SG_LOG(SG_IO, SG_ALERT, "SGBinObject::write_objects: object with material:"
688 << m << "has no indices set");
692 sgWriteChar( fp, (char)SG_INDEX_TYPES ); // property
693 sgWriteUInt( fp, 1 ); // nbytes
694 sgWriteChar( fp, idx_mask );
696 // cout << "material:" << m << ", count =" << count << endl;
698 for (unsigned int i=start; i < end; ++i) {
699 const int_list& va(verts[i]);
700 const int_list& na((idx_mask & SG_IDX_NORMALS) ? normals[i] : emptyList);
701 const int_list& ca((idx_mask & SG_IDX_COLORS) ? colors[i] : emptyList);
702 const int_list& tca((idx_mask & SG_IDX_TEXCOORDS) ? texCoords[i] : emptyList);
705 write_indices<uint16_t>(fp, idx_mask, va, na, ca, tca);
707 write_indices<uint32_t>(fp, idx_mask, va, na, ca, tca);
712 } // of materials iteration
715 // write out the structures to a binary file. We assume that the
716 // groups come to us sorted by material property. If not, things
717 // don't break, but the result won't be as optimal.
718 bool SGBinObject::write_bin( const string& base, const string& name,
722 SGPath file = base + "/" + b.gen_base_path() + "/" + name + ".gz";
723 return write_bin_file(file);
726 static unsigned int max_object_size( const string_list& materials )
728 unsigned int max_size = 0;
730 for (unsigned int start=0; start < materials.size();) {
731 string m = materials[start];
732 unsigned int end = start + 1;
733 // find range of objects with identical material, calc its size
734 for (; (end < materials.size()) && (m == materials[end]); ++end) {}
736 unsigned int cur_size = end - start;
737 max_size = std::max(max_size, cur_size);
744 const unsigned int VERSION_7_MATERIAL_LIMIT = 0x7fff;
746 bool SGBinObject::write_bin_file(const SGPath& file)
751 file2.create_dir( 0755 );
752 cout << "Output file = " << file.str() << endl;
755 if ( (fp = gzopen( file.c_str(), "wb9" )) == NULL ) {
756 cout << "ERROR: opening " << file.str() << " for writing!" << endl;
762 cout << "points size = " << pts_v.size() << " pt_materials = "
763 << pt_materials.size() << endl;
764 cout << "triangles size = " << tris_v.size() << " tri_materials = "
765 << tri_materials.size() << endl;
766 cout << "strips size = " << strips_v.size() << " strip_materials = "
767 << strip_materials.size() << endl;
768 cout << "fans size = " << fans_v.size() << " fan_materials = "
769 << fan_materials.size() << endl;
771 cout << "nodes = " << wgs84_nodes.size() << endl;
772 cout << "colors = " << colors.size() << endl;
773 cout << "normals = " << normals.size() << endl;
774 cout << "tex coords = " << texcoords.size() << endl;
777 bool shortMaterialsRanges =
778 (max_object_size(pt_materials) < VERSION_7_MATERIAL_LIMIT) &&
779 (max_object_size(fan_materials) < VERSION_7_MATERIAL_LIMIT) &&
780 (max_object_size(strip_materials) < VERSION_7_MATERIAL_LIMIT) &&
781 (max_object_size(tri_materials) < VERSION_7_MATERIAL_LIMIT);
783 if ((wgs84_nodes.size() < 0xffff) &&
784 (normals.size() < 0xffff) &&
785 (texcoords.size() < 0xffff) &&
786 shortMaterialsRanges) {
787 version = 7; // use smaller indices if possible
790 // write header magic
792 /** Magic Number for our file format */
793 #define SG_FILE_MAGIC_NUMBER ( ('S'<<24) + ('G'<<16) + version )
795 sgWriteUInt( fp, SG_FILE_MAGIC_NUMBER );
796 time_t calendar_time = time(NULL);
797 sgWriteLong( fp, (int32_t)calendar_time );
799 // calculate and write number of top level objects
800 int nobjects = 5; // gbs, vertices, colors, normals, texcoords
801 nobjects += count_objects(pt_materials);
802 nobjects += count_objects(tri_materials);
803 nobjects += count_objects(strip_materials);
804 nobjects += count_objects(fan_materials);
806 cout << "total top level objects = " << nobjects << endl;
808 sgWriteUShort( fp, (uint16_t) nobjects );
810 sgWriteInt( fp, nobjects );
813 // write bounding sphere
814 write_header( fp, SG_BOUNDING_SPHERE, 0, 1);
815 sgWriteUInt( fp, sizeof(double) * 3 + sizeof(float) ); // nbytes
816 sgWritedVec3( fp, gbs_center );
817 sgWriteFloat( fp, gbs_radius );
820 write_header( fp, SG_VERTEX_LIST, 0, 1);
821 sgWriteUInt( fp, wgs84_nodes.size() * sizeof(float) * 3 ); // nbytes
822 for ( i = 0; i < (int)wgs84_nodes.size(); ++i ) {
823 sgWriteVec3( fp, toVec3f(wgs84_nodes[i] - gbs_center));
826 // dump vertex color list
827 write_header( fp, SG_COLOR_LIST, 0, 1);
828 sgWriteUInt( fp, colors.size() * sizeof(float) * 4 ); // nbytes
829 for ( i = 0; i < (int)colors.size(); ++i ) {
830 sgWriteVec4( fp, colors[i]);
833 // dump vertex normal list
834 write_header( fp, SG_NORMAL_LIST, 0, 1);
835 sgWriteUInt( fp, normals.size() * 3 ); // nbytes
837 for ( i = 0; i < (int)normals.size(); ++i ) {
838 SGVec3f p = normals[i];
839 normal[0] = (unsigned char)((p.x() + 1.0) * 127.5);
840 normal[1] = (unsigned char)((p.y() + 1.0) * 127.5);
841 normal[2] = (unsigned char)((p.z() + 1.0) * 127.5);
842 sgWriteBytes( fp, 3, normal );
845 // dump texture coordinates
846 write_header( fp, SG_TEXCOORD_LIST, 0, 1);
847 sgWriteUInt( fp, texcoords.size() * sizeof(float) * 2 ); // nbytes
848 for ( i = 0; i < (int)texcoords.size(); ++i ) {
849 sgWriteVec2( fp, texcoords[i]);
852 write_objects(fp, SG_POINTS, pts_v, pts_n, pts_c, pts_tc, pt_materials);
853 write_objects(fp, SG_TRIANGLE_FACES, tris_v, tris_n, tris_c, tris_tc, tri_materials);
854 write_objects(fp, SG_TRIANGLE_STRIPS, strips_v, strips_n, strips_c, strips_tc, strip_materials);
855 write_objects(fp, SG_TRIANGLE_FANS, fans_v, fans_n, fans_c, fans_tc, fan_materials);
860 if ( sgWriteError() ) {
861 cout << "Error while writing file " << file.str() << endl;
869 // write out the structures to an ASCII file. We assume that the
870 // groups come to us sorted by material property. If not, things
871 // don't break, but the result won't be as optimal.
872 bool SGBinObject::write_ascii( const string& base, const string& name,
877 SGPath file = base + "/" + b.gen_base_path() + "/" + name;
878 file.create_dir( 0755 );
879 cout << "Output file = " << file.str() << endl;
882 if ( (fp = fopen( file.c_str(), "w" )) == NULL ) {
883 cout << "ERROR: opening " << file.str() << " for writing!" << endl;
887 cout << "triangles size = " << tris_v.size() << " tri_materials = "
888 << tri_materials.size() << endl;
889 cout << "strips size = " << strips_v.size() << " strip_materials = "
890 << strip_materials.size() << endl;
891 cout << "fans size = " << fans_v.size() << " fan_materials = "
892 << fan_materials.size() << endl;
894 cout << "points = " << wgs84_nodes.size() << endl;
895 cout << "tex coords = " << texcoords.size() << endl;
897 fprintf(fp, "# FGFS Scenery\n");
898 fprintf(fp, "# Version %s\n", SG_SCENERY_FILE_FORMAT);
900 time_t calendar_time = time(NULL);
902 local_tm = localtime( &calendar_time );
904 strftime( time_str, 256, "%a %b %d %H:%M:%S %Z %Y", local_tm);
905 fprintf(fp, "# Created %s\n", time_str );
908 // write bounding sphere
909 fprintf(fp, "# gbs %.5f %.5f %.5f %.2f\n",
910 gbs_center.x(), gbs_center.y(), gbs_center.z(), gbs_radius);
914 fprintf(fp, "# vertex list\n");
915 for ( i = 0; i < (int)wgs84_nodes.size(); ++i ) {
916 SGVec3d p = wgs84_nodes[i] - gbs_center;
918 fprintf(fp, "v %.5f %.5f %.5f\n", p.x(), p.y(), p.z() );
922 fprintf(fp, "# vertex normal list\n");
923 for ( i = 0; i < (int)normals.size(); ++i ) {
924 SGVec3f p = normals[i];
925 fprintf(fp, "vn %.5f %.5f %.5f\n", p.x(), p.y(), p.z() );
929 // dump texture coordinates
930 fprintf(fp, "# texture coordinate list\n");
931 for ( i = 0; i < (int)texcoords.size(); ++i ) {
932 SGVec2f p = texcoords[i];
933 fprintf(fp, "vt %.5f %.5f\n", p.x(), p.y() );
937 // dump individual triangles if they exist
938 if ( ! tris_v.empty() ) {
939 fprintf(fp, "# triangle groups\n");
944 while ( start < (int)tri_materials.size() ) {
946 material = tri_materials[start];
947 while ( (end < (int)tri_materials.size()) &&
948 (material == tri_materials[end]) )
950 // cout << "end = " << end << endl;
953 // cout << "group = " << start << " to " << end - 1 << endl;
956 for ( i = start; i < end; ++i ) {
957 for ( j = 0; j < (int)tris_v[i].size(); ++j ) {
958 d.expandBy(wgs84_nodes[ tris_v[i][j] ]);
962 SGVec3d bs_center = d.getCenter();
963 double bs_radius = d.getRadius();
965 // write group headers
967 fprintf(fp, "# usemtl %s\n", material.c_str());
968 fprintf(fp, "# bs %.4f %.4f %.4f %.2f\n",
969 bs_center.x(), bs_center.y(), bs_center.z(), bs_radius);
972 for ( i = start; i < end; ++i ) {
974 for ( j = 0; j < (int)tris_v[i].size(); ++j ) {
975 fprintf(fp, " %d/%d", tris_v[i][j], tris_tc[i][j] );
985 // dump triangle groups
986 if ( ! strips_v.empty() ) {
987 fprintf(fp, "# triangle strips\n");
992 while ( start < (int)strip_materials.size() ) {
994 material = strip_materials[start];
995 while ( (end < (int)strip_materials.size()) &&
996 (material == strip_materials[end]) )
998 // cout << "end = " << end << endl;
1001 // cout << "group = " << start << " to " << end - 1 << endl;
1005 for ( i = start; i < end; ++i ) {
1006 for ( j = 0; j < (int)tris_v[i].size(); ++j ) {
1007 d.expandBy(wgs84_nodes[ tris_v[i][j] ]);
1011 SGVec3d bs_center = d.getCenter();
1012 double bs_radius = d.getRadius();
1014 // write group headers
1016 fprintf(fp, "# usemtl %s\n", material.c_str());
1017 fprintf(fp, "# bs %.4f %.4f %.4f %.2f\n",
1018 bs_center.x(), bs_center.y(), bs_center.z(), bs_radius);
1021 for ( i = start; i < end; ++i ) {
1023 for ( j = 0; j < (int)strips_v[i].size(); ++j ) {
1024 fprintf(fp, " %d/%d", strips_v[i][j], strips_tc[i][j] );
1037 string command = "gzip --force --best " + file.str();
1038 int err = system(command.c_str());
1041 cout << "ERROR: gzip " << file.str() << " failed!" << endl;
1047 void SGBinObject::read_properties(gzFile fp, int nproperties)
1053 for ( int j = 0; j < nproperties; ++j ) {
1055 sgReadChar( fp, &prop_type );
1056 sgReadUInt( fp, &nbytes );
1057 // cout << "property size = " << nbytes << endl;
1058 if ( nbytes > buf.get_size() ) { buf.resize( nbytes ); }
1059 char *ptr = buf.get_ptr();
1060 sgReadBytes( fp, nbytes, ptr );