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simgear/simgear/io/sg_binobj.cxx
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// sg_binobj.cxx -- routines to read and write low level flightgear 3d objects
//
// Written by Curtis Olson, started January 2000.
//
// Copyright (C) 2000 Curtis L. Olson - curt@flightgear.org
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//
// $Id$
//
#include <simgear/compiler.h>
#include <stdio.h>
#include <time.h>
#include <vector>
#include STL_STRING
#include <simgear/bucket/newbucket.hxx>
#include "lowlevel.hxx"
#include "sg_binobj.hxx"
SG_USING_STD( string );
SG_USING_STD( vector );
#if !defined (SG_HAVE_NATIVE_SGI_COMPILERS)
SG_USING_STD( cout );
SG_USING_STD( endl );
#endif
enum {
SG_BOUNDING_SPHERE = 0,
SG_VERTEX_LIST = 1,
SG_COLOR_LIST = 4,
SG_NORMAL_LIST = 2,
SG_TEXCOORD_LIST = 3,
SG_POINTS = 9,
SG_TRIANGLE_FACES = 10,
SG_TRIANGLE_STRIPS = 11,
SG_TRIANGLE_FANS = 12
} sgObjectTypes;
enum {
SG_IDX_VERTICES = 0x01,
SG_IDX_NORMALS = 0x02,
SG_IDX_COLORS = 0x04,
SG_IDX_TEXCOORDS = 0x08
} sgIndexTypes;
enum {
SG_MATERIAL = 0,
SG_INDEX_TYPES = 1
} sgPropertyTypes;
class sgSimpleBuffer {
private:
char *ptr;
unsigned int size;
public:
inline sgSimpleBuffer( unsigned int s )
{
size = 1;
while ( size < s ) {
size *= 2;
}
cout << "Creating a new buffer of size = " << size << endl;
ptr = new char[size];
}
inline ~sgSimpleBuffer() {
delete [] ptr;
}
inline unsigned int get_size() const { return size; }
inline char *get_ptr() const { return ptr; }
inline void resize( unsigned int s ) {
if ( s > size ) {
if ( ptr != NULL ) {
delete [] ptr;
}
while ( size < s ) {
size *= 2;
}
cout << "resizing buffer to size = " << size << endl;
ptr = new char[size];
}
}
};
// calculate the center of a list of points, by taking the halfway
// point between the min and max points.
static Point3D calc_center( point_list& wgs84_nodes ) {
Point3D p, min, max;
if ( wgs84_nodes.size() ) {
min = max = wgs84_nodes[0];
} else {
min = max = Point3D( 0 );
}
for ( int i = 0; i < (int)wgs84_nodes.size(); ++i ) {
p = wgs84_nodes[i];
if ( p.x() < min.x() ) { min.setx( p.x() ); }
if ( p.y() < min.y() ) { min.sety( p.y() ); }
if ( p.z() < min.z() ) { min.setz( p.z() ); }
if ( p.x() > max.x() ) { max.setx( p.x() ); }
if ( p.y() > max.y() ) { max.sety( p.y() ); }
if ( p.z() > max.z() ) { max.setz( p.z() ); }
}
return ( min + max ) / 2.0;
}
// calculate the bounding sphere. Center is the center of the
// tile and zero elevation
double sgCalcBoundingRadius( Point3D center, point_list& wgs84_nodes ) {
double dist_squared;
double radius_squared = 0;
for ( int i = 0; i < (int)wgs84_nodes.size(); ++i ) {
dist_squared = center.distance3Dsquared( wgs84_nodes[i] );
if ( dist_squared > radius_squared ) {
radius_squared = dist_squared;
}
}
return sqrt(radius_squared);
}
// read object properties
static void read_object( gzFile fp,
int obj_type,
int nproperties,
int nelements,
group_list *vertices,
group_list *normals,
group_list *colors,
group_list *texcoords,
string_list *materials )
{
unsigned int nbytes;
unsigned char idx_mask;
int idx_size;
bool do_vertices, do_normals, do_colors, do_texcoords;
int j, k, idx;
static sgSimpleBuffer buf( 32768 ); // 32 Kb
char material[256];
// default values
if ( obj_type == SG_POINTS ) {
idx_size = 1;
idx_mask = SG_IDX_VERTICES;
do_vertices = true;
do_normals = false;
do_colors = false;
do_texcoords = false;
} else {
idx_size = 2;
idx_mask = (char)(SG_IDX_VERTICES | SG_IDX_TEXCOORDS);
do_vertices = true;
do_normals = false;
do_colors = false;
do_texcoords = true;
}
for ( j = 0; j < nproperties; ++j ) {
char prop_type;
sgReadChar( fp, &prop_type );
sgReadUInt( fp, &nbytes );
// cout << "property size = " << nbytes << endl;
if ( nbytes > buf.get_size() ) { buf.resize( nbytes ); }
char *ptr = buf.get_ptr();
sgReadBytes( fp, nbytes, ptr );
if ( prop_type == SG_MATERIAL ) {
strncpy( material, ptr, nbytes );
material[nbytes] = '\0';
// cout << "material type = " << material << endl;
} else if ( prop_type == SG_INDEX_TYPES ) {
idx_mask = ptr[0];
// cout << "idx_mask = " << (int)idx_mask << endl;
idx_size = 0;
do_vertices = false;
do_normals = false;
do_colors = false;
do_texcoords = false;
if ( idx_mask & SG_IDX_VERTICES ) {
do_vertices = true;
++idx_size;
}
if ( idx_mask & SG_IDX_NORMALS ) {
do_normals = true;
++idx_size;
}
if ( idx_mask & SG_IDX_COLORS ) {
do_colors = true;
++idx_size;
}
if ( idx_mask & SG_IDX_TEXCOORDS ) {
do_texcoords = true;
++idx_size;
}
}
}
for ( j = 0; j < nelements; ++j ) {
sgReadUInt( fp, &nbytes );
// cout << "element size = " << nbytes << endl;
if ( nbytes > buf.get_size() ) { buf.resize( nbytes ); }
char *ptr = buf.get_ptr();
sgReadBytes( fp, nbytes, ptr );
int count = nbytes / (idx_size * sizeof(short));
short *sptr = (short *)ptr;
int_list vs; vs.clear();
int_list ns; ns.clear();
int_list cs; cs.clear();
int_list tcs; tcs.clear();
for ( k = 0; k < count; ++k ) {
if ( sgIsBigEndian() ) {
for ( idx = 0; idx < idx_size; ++idx ) {
sgEndianSwap( (unsigned short *)&(sptr[idx]) );
}
}
idx = 0;
if ( do_vertices ) {
vs.push_back( sptr[idx++] );
}
if ( do_normals ) {
ns.push_back( sptr[idx++] );
}
if ( do_colors ) {
cs.push_back( sptr[idx++] );
}
if ( do_texcoords ) {
tcs.push_back( sptr[idx++] );
}
// cout << sptr[0] << " ";
sptr += idx_size;
}
// cout << endl;
vertices->push_back( vs );
normals->push_back( ns );
colors->push_back( cs );
texcoords->push_back( tcs );
materials->push_back( material );
}
}
// read a binary file and populate the provided structures.
bool SGBinObject::read_bin( const string& file ) {
Point3D p;
int i, j, k;
unsigned int nbytes;
static sgSimpleBuffer buf( 32768 ); // 32 Kb
// zero out structures
gbs_center = Point3D( 0 );
gbs_radius = 0.0;
wgs84_nodes.clear();
normals.clear();
texcoords.clear();
pts_v.clear();
pts_n.clear();
pts_c.clear();
pts_tc.clear();
pt_materials.clear();
tris_v.clear();
tris_n.clear();
tris_c.clear();
tris_tc.clear();
tri_materials.clear();
strips_v.clear();
strips_n.clear();
strips_c.clear();
strips_tc.clear();
strip_materials.clear();
fans_v.clear();
fans_n.clear();
fans_c.clear();
fans_tc.clear();
fan_materials.clear();
gzFile fp;
if ( (fp = gzopen( file.c_str(), "rb" )) == NULL ) {
string filegz = file + ".gz";
if ( (fp = gzopen( filegz.c_str(), "rb" )) == NULL ) {
cout << "ERROR: opening " << file << " or " << filegz
<< "for reading!" << endl;
return false;
}
}
sgClearReadError();
// read headers
unsigned int header;
sgReadUInt( fp, &header );
if ( ((header & 0xFF000000) >> 24) == 'S' &&
((header & 0x00FF0000) >> 16) == 'G' ) {
// cout << "Good header" << endl;
// read file version
version = (header & 0x0000FFFF);
// cout << "File version = " << version << endl;
} else {
// close the file before we return
gzclose(fp);
return false;
}
// read creation time
unsigned int foo_calendar_time;
sgReadUInt( fp, &foo_calendar_time );
#if 0
time_t calendar_time = foo_calendar_time;
// The following code has a global effect on the host application
// and can screws up the time elsewhere. It should be avoided
// unless you need this for debugging in which case you should
// disable it again once the debugging task is finished.
struct tm *local_tm;
local_tm = localtime( &calendar_time );
char time_str[256];
strftime( time_str, 256, "%a %b %d %H:%M:%S %Z %Y", local_tm);
cout << "File created on " << time_str << endl;
#endif
// read number of top level objects
short nobjects;
sgReadShort( fp, &nobjects );
// cout << "Total objects to read = " << nobjects << endl;
// read in objects
for ( i = 0; i < nobjects; ++i ) {
// read object header
char obj_type;
short nproperties, nelements;
sgReadChar( fp, &obj_type );
sgReadShort( fp, &nproperties );
sgReadShort( fp, &nelements );
// cout << "object " << i << " = " << (int)obj_type << " props = "
// << nproperties << " elements = " << nelements << endl;
if ( obj_type == SG_BOUNDING_SPHERE ) {
// read bounding sphere properties
for ( j = 0; j < nproperties; ++j ) {
char prop_type;
sgReadChar( fp, &prop_type );
sgReadUInt( fp, &nbytes );
// cout << "property size = " << nbytes << endl;
if ( nbytes > buf.get_size() ) { buf.resize( nbytes ); }
char *ptr = buf.get_ptr();
sgReadBytes( fp, nbytes, ptr );
}
// read bounding sphere elements
for ( j = 0; j < nelements; ++j ) {
sgReadUInt( fp, &nbytes );
// cout << "element size = " << nbytes << endl;
if ( nbytes > buf.get_size() ) { buf.resize( nbytes ); }
char *ptr = buf.get_ptr();
sgReadBytes( fp, nbytes, ptr );
double *dptr = (double *)ptr;
if ( sgIsBigEndian() ) {
sgEndianSwap( (uint64 *)&(dptr[0]) );
sgEndianSwap( (uint64 *)&(dptr[1]) );
sgEndianSwap( (uint64 *)&(dptr[2]) );
}
gbs_center = Point3D( dptr[0], dptr[1], dptr[2] );
// cout << "Center = " << gbs_center << endl;
ptr += sizeof(double) * 3;
float *fptr = (float *)ptr;
if ( sgIsBigEndian() ) {
sgEndianSwap( (unsigned int *)fptr );
}
gbs_radius = fptr[0];
// cout << "Bounding radius = " << gbs_radius << endl;
}
} else if ( obj_type == SG_VERTEX_LIST ) {
// read vertex list properties
for ( j = 0; j < nproperties; ++j ) {
char prop_type;
sgReadChar( fp, &prop_type );
sgReadUInt( fp, &nbytes );
// cout << "property size = " << nbytes << endl;
if ( nbytes > buf.get_size() ) { buf.resize( nbytes ); }
char *ptr = buf.get_ptr();
sgReadBytes( fp, nbytes, ptr );
}
// read vertex list elements
for ( j = 0; j < nelements; ++j ) {
sgReadUInt( fp, &nbytes );
// cout << "element size = " << nbytes << endl;
if ( nbytes > buf.get_size() ) { buf.resize( nbytes ); }
char *ptr = buf.get_ptr();
sgReadBytes( fp, nbytes, ptr );
int count = nbytes / (sizeof(float) * 3);
float *fptr = (float *)ptr;
for ( k = 0; k < count; ++k ) {
if ( sgIsBigEndian() ) {
sgEndianSwap( (unsigned int *)&(fptr[0]) );
sgEndianSwap( (unsigned int *)&(fptr[1]) );
sgEndianSwap( (unsigned int *)&(fptr[2]) );
}
p = Point3D( fptr[0], fptr[1], fptr[2] );
// cout << "node = " << p << endl;
wgs84_nodes.push_back( p );
fptr += 3;
}
}
} else if ( obj_type == SG_COLOR_LIST ) {
// read color list properties
for ( j = 0; j < nproperties; ++j ) {
char prop_type;
sgReadChar( fp, &prop_type );
sgReadUInt( fp, &nbytes );
// cout << "property size = " << nbytes << endl;
if ( nbytes > buf.get_size() ) { buf.resize( nbytes ); }
char *ptr = buf.get_ptr();
sgReadBytes( fp, nbytes, ptr );
}
// read color list elements
for ( j = 0; j < nelements; ++j ) {
sgReadUInt( fp, &nbytes );
// cout << "element size = " << nbytes << endl;
if ( nbytes > buf.get_size() ) { buf.resize( nbytes ); }
char *ptr = buf.get_ptr();
sgReadBytes( fp, nbytes, ptr );
int count = nbytes / (sizeof(float) * 4);
float *fptr = (float *)ptr;
for ( k = 0; k < count; ++k ) {
if ( sgIsBigEndian() ) {
sgEndianSwap( (unsigned int *)&(fptr[0]) );
sgEndianSwap( (unsigned int *)&(fptr[1]) );
sgEndianSwap( (unsigned int *)&(fptr[2]) );
sgEndianSwap( (unsigned int *)&(fptr[3]) );
}
p = Point3D( fptr[0], fptr[1], fptr[2] );
// cout << "node = " << p << endl;
colors.push_back( p );
fptr += 4;
}
}
} else if ( obj_type == SG_NORMAL_LIST ) {
// read normal list properties
for ( j = 0; j < nproperties; ++j ) {
char prop_type;
sgReadChar( fp, &prop_type );
sgReadUInt( fp, &nbytes );
// cout << "property size = " << nbytes << endl;
if ( nbytes > buf.get_size() ) { buf.resize( nbytes ); }
char *ptr = buf.get_ptr();
sgReadBytes( fp, nbytes, ptr );
}
// read normal list elements
for ( j = 0; j < nelements; ++j ) {
sgReadUInt( fp, &nbytes );
// cout << "element size = " << nbytes << endl;
if ( nbytes > buf.get_size() ) { buf.resize( nbytes ); }
unsigned char *ptr = (unsigned char *)(buf.get_ptr());
sgReadBytes( fp, nbytes, ptr );
int count = nbytes / 3;
for ( k = 0; k < count; ++k ) {
sgdVec3 normal;
sgdSetVec3( normal,
(ptr[0]) / 127.5 - 1.0,
(ptr[1]) / 127.5 - 1.0,
(ptr[2]) / 127.5 - 1.0 );
sgdNormalizeVec3( normal );
p = Point3D( normal[0], normal[1], normal[2] );
// cout << "normal = " << p << endl;
normals.push_back( p );
ptr += 3;
}
}
} else if ( obj_type == SG_TEXCOORD_LIST ) {
// read texcoord list properties
for ( j = 0; j < nproperties; ++j ) {
char prop_type;
sgReadChar( fp, &prop_type );
sgReadUInt( fp, &nbytes );
// cout << "property size = " << nbytes << endl;
if ( nbytes > buf.get_size() ) { buf.resize( nbytes ); }
char *ptr = buf.get_ptr();
sgReadBytes( fp, nbytes, ptr );
}
// read texcoord list elements
for ( j = 0; j < nelements; ++j ) {
sgReadUInt( fp, &nbytes );
// cout << "element size = " << nbytes << endl;
if ( nbytes > buf.get_size() ) { buf.resize( nbytes ); }
char *ptr = buf.get_ptr();
sgReadBytes( fp, nbytes, ptr );
int count = nbytes / (sizeof(float) * 2);
float *fptr = (float *)ptr;
for ( k = 0; k < count; ++k ) {
if ( sgIsBigEndian() ) {
sgEndianSwap( (unsigned int *)&(fptr[0]) );
sgEndianSwap( (unsigned int *)&(fptr[1]) );
}
p = Point3D( fptr[0], fptr[1], 0 );
// cout << "texcoord = " << p << endl;
texcoords.push_back( p );
fptr += 2;
}
}
} else if ( obj_type == SG_POINTS ) {
// read point elements
read_object( fp, SG_POINTS, nproperties, nelements,
&pts_v, &pts_n, &pts_c, &pts_tc, &pt_materials );
} else if ( obj_type == SG_TRIANGLE_FACES ) {
// read triangle face properties
read_object( fp, SG_TRIANGLE_FACES, nproperties, nelements,
&tris_v, &tris_n, &tris_c, &tris_tc, &tri_materials );
} else if ( obj_type == SG_TRIANGLE_STRIPS ) {
// read triangle strip properties
read_object( fp, SG_TRIANGLE_STRIPS, nproperties, nelements,
&strips_v, &strips_n, &strips_c, &strips_tc,
&strip_materials );
} else if ( obj_type == SG_TRIANGLE_FANS ) {
// read triangle fan properties
read_object( fp, SG_TRIANGLE_FANS, nproperties, nelements,
&fans_v, &fans_n, &fans_c, &fans_tc, &fan_materials );
} else {
// unknown object type, just skip
// read properties
for ( j = 0; j < nproperties; ++j ) {
char prop_type;
sgReadChar( fp, &prop_type );
sgReadUInt( fp, &nbytes );
// cout << "property size = " << nbytes << endl;
if ( nbytes > buf.get_size() ) { buf.resize( nbytes ); }
char *ptr = buf.get_ptr();
sgReadBytes( fp, nbytes, ptr );
}
// read elements
for ( j = 0; j < nelements; ++j ) {
sgReadUInt( fp, &nbytes );
// cout << "element size = " << nbytes << endl;
if ( nbytes > buf.get_size() ) { buf.resize( nbytes ); }
char *ptr = buf.get_ptr();
sgReadBytes( fp, nbytes, ptr );
}
}
}
// close the file
gzclose(fp);
if ( sgReadError() ) {
cout << "We detected an error while reading the file." << endl;
return false;
}
return true;
}
// write out the structures to a binary file. We assume that the
// groups come to us sorted by material property. If not, things
// don't break, but the result won't be as optimal.
bool SGBinObject::write_bin( const string& base, const string& name,
const SGBucket& b )
{
Point3D p;
sgVec2 t;
sgVec3 pt;
sgVec4 color;
int i, j;
unsigned char idx_mask;
int idx_size;
string dir = base + "/" + b.gen_base_path();
string command = "mkdir -p " + dir;
#if defined(_MSC_VER) || defined(__MINGW32__)
system( (string("mkdir ") + dir).c_str() );
#else
system(command.c_str());
#endif
string file = dir + "/" + name + ".gz";
cout << "Output file = " << file << endl;
gzFile fp;
if ( (fp = gzopen( file.c_str(), "wb9" )) == NULL ) {
cout << "ERROR: opening " << file << " for writing!" << endl;
return false;
}
sgClearWriteError();
cout << "points size = " << pts_v.size() << " pt_materials = "
<< pt_materials.size() << endl;
cout << "triangles size = " << tris_v.size() << " tri_materials = "
<< tri_materials.size() << endl;
cout << "strips size = " << strips_v.size() << " strip_materials = "
<< strip_materials.size() << endl;
cout << "fans size = " << fans_v.size() << " fan_materials = "
<< fan_materials.size() << endl;
cout << "nodes = " << wgs84_nodes.size() << endl;
cout << "colors = " << colors.size() << endl;
cout << "normals = " << normals.size() << endl;
cout << "tex coords = " << texcoords.size() << endl;
// write header magic
sgWriteUInt( fp, SG_FILE_MAGIC_NUMBER );
time_t calendar_time = time(NULL);
sgWriteLong( fp, (long int)calendar_time );
// calculate and write number of top level objects
string material;
int start;
int end;
short nobjects = 0;
nobjects++; // for gbs
nobjects++; // for vertices
nobjects++; // for colors
nobjects++; // for normals
nobjects++; // for texcoords
// points
short npts = 0;
start = 0; end = 1;
while ( start < (int)pt_materials.size() ) {
material = pt_materials[start];
while ( (end < (int)pt_materials.size()) &&
(material == pt_materials[end]) ) {
end++;
}
npts++;
start = end; end = start + 1;
}
nobjects += npts;
// tris
short ntris = 0;
start = 0; end = 1;
while ( start < (int)tri_materials.size() ) {
material = tri_materials[start];
while ( (end < (int)tri_materials.size()) &&
(material == tri_materials[end]) ) {
end++;
}
ntris++;
start = end; end = start + 1;
}
nobjects += ntris;
// strips
short nstrips = 0;
start = 0; end = 1;
while ( start < (int)strip_materials.size() ) {
material = strip_materials[start];
while ( (end < (int)strip_materials.size()) &&
(material == strip_materials[end]) ) {
end++;
}
nstrips++;
start = end; end = start + 1;
}
nobjects += nstrips;
// fans
short nfans = 0;
start = 0; end = 1;
while ( start < (int)fan_materials.size() ) {
material = fan_materials[start];
while ( (end < (int)fan_materials.size()) &&
(material == fan_materials[end]) ) {
end++;
}
nfans++;
start = end; end = start + 1;
}
nobjects += nfans;
cout << "total top level objects = " << nobjects << endl;
sgWriteShort( fp, nobjects );
// write bounding sphere
sgWriteChar( fp, (char)SG_BOUNDING_SPHERE ); // type
sgWriteShort( fp, 0 ); // nproperties
sgWriteShort( fp, 1 ); // nelements
sgWriteUInt( fp, sizeof(double) * 3 + sizeof(float) ); // nbytes
sgdVec3 center;
sgdSetVec3( center, gbs_center.x(), gbs_center.y(), gbs_center.z() );
sgWritedVec3( fp, center );
sgWriteFloat( fp, gbs_radius );
// dump vertex list
sgWriteChar( fp, (char)SG_VERTEX_LIST ); // type
sgWriteShort( fp, 0 ); // nproperties
sgWriteShort( fp, 1 ); // nelements
sgWriteUInt( fp, wgs84_nodes.size() * sizeof(float) * 3 ); // nbytes
for ( i = 0; i < (int)wgs84_nodes.size(); ++i ) {
p = wgs84_nodes[i] - gbs_center;
sgSetVec3( pt, p.x(), p.y(), p.z() );
sgWriteVec3( fp, pt );
}
// dump vertex color list
sgWriteChar( fp, (char)SG_COLOR_LIST ); // type
sgWriteShort( fp, 0 ); // nproperties
sgWriteShort( fp, 1 ); // nelements
sgWriteUInt( fp, colors.size() * sizeof(float) * 4 ); // nbytes
for ( i = 0; i < (int)colors.size(); ++i ) {
p = colors[i];
// Right now we have a place holder for color alpha but we
// need to update the interface so the calling program can
// provide the info.
sgSetVec4( color, p.x(), p.y(), p.z(), 1.0 );
sgWriteVec4( fp, color );
}
// dump vertex normal list
sgWriteChar( fp, (char)SG_NORMAL_LIST ); // type
sgWriteShort( fp, 0 ); // nproperties
sgWriteShort( fp, 1 ); // nelements
sgWriteUInt( fp, normals.size() * 3 ); // nbytes
char normal[3];
for ( i = 0; i < (int)normals.size(); ++i ) {
p = normals[i];
normal[0] = (unsigned char)((p.x() + 1.0) * 127.5);
normal[1] = (unsigned char)((p.y() + 1.0) * 127.5);
normal[2] = (unsigned char)((p.z() + 1.0) * 127.5);
sgWriteBytes( fp, 3, normal );
}
// dump texture coordinates
sgWriteChar( fp, (char)SG_TEXCOORD_LIST ); // type
sgWriteShort( fp, 0 ); // nproperties
sgWriteShort( fp, 1 ); // nelements
sgWriteUInt( fp, texcoords.size() * sizeof(float) * 2 ); // nbytes
for ( i = 0; i < (int)texcoords.size(); ++i ) {
p = texcoords[i];
sgSetVec2( t, p.x(), p.y() );
sgWriteVec2( fp, t );
}
// dump point groups if they exist
if ( pts_v.size() > 0 ) {
int start = 0;
int end = 1;
string material;
while ( start < (int)pt_materials.size() ) {
// find next group
material = pt_materials[start];
while ( (end < (int)pt_materials.size()) &&
(material == pt_materials[end]) )
{
// cout << "end = " << end << endl;
end++;
}
// cout << "group = " << start << " to " << end - 1 << endl;
// write group headers
sgWriteChar( fp, (char)SG_POINTS ); // type
sgWriteShort( fp, 2 ); // nproperties
sgWriteShort( fp, end - start ); // nelements
sgWriteChar( fp, (char)SG_MATERIAL ); // property
sgWriteUInt( fp, material.length() ); // nbytes
sgWriteBytes( fp, material.length(), material.c_str() );
idx_mask = 0;
idx_size = 0;
if ( pts_v.size() ) { idx_mask |= SG_IDX_VERTICES; ++idx_size; }
if ( pts_n.size() ) { idx_mask |= SG_IDX_NORMALS; ++idx_size; }
if ( pts_c.size() ) { idx_mask |= SG_IDX_COLORS; ++idx_size; }
if ( pts_tc.size() ) { idx_mask |= SG_IDX_TEXCOORDS; ++idx_size; }
sgWriteChar( fp, (char)SG_INDEX_TYPES ); // property
sgWriteUInt( fp, 1 ); // nbytes
sgWriteChar( fp, idx_mask );
// write strips
for ( i = start; i < end; ++i ) {
// nbytes
sgWriteUInt( fp, pts_v[i].size() * idx_size * sizeof(short) );
for ( j = 0; j < (int)pts_v[i].size(); ++j ) {
if ( pts_v.size() ) {
sgWriteShort( fp, (short)pts_v[i][j] );
}
if ( pts_n.size() ) {
sgWriteShort( fp, (short)pts_n[i][j] );
}
if ( pts_c.size() ) {
sgWriteShort( fp, (short)pts_c[i][j] );
}
if ( pts_tc.size() ) {
sgWriteShort( fp, (short)pts_tc[i][j] );
}
}
}
start = end;
end = start + 1;
}
}
// dump individual triangles if they exist
if ( tris_v.size() > 0 ) {
int start = 0;
int end = 1;
string material;
while ( start < (int)tri_materials.size() ) {
// find next group
material = tri_materials[start];
while ( (end < (int)tri_materials.size()) &&
(material == tri_materials[end]) )
{
// cout << "end = " << end << endl;
end++;
}
// cout << "group = " << start << " to " << end - 1 << endl;
// write group headers
sgWriteChar( fp, (char)SG_TRIANGLE_FACES ); // type
sgWriteShort( fp, 2 ); // nproperties
sgWriteShort( fp, 1 ); // nelements
sgWriteChar( fp, (char)SG_MATERIAL ); // property
sgWriteUInt( fp, material.length() ); // nbytes
sgWriteBytes( fp, material.length(), material.c_str() );
idx_mask = 0;
idx_size = 0;
if ( tris_v.size() ) { idx_mask |= SG_IDX_VERTICES; ++idx_size; }
if ( tris_n.size() ) { idx_mask |= SG_IDX_NORMALS; ++idx_size; }
if ( tris_c.size() ) { idx_mask |= SG_IDX_COLORS; ++idx_size; }
if ( tris_tc.size() ) { idx_mask |= SG_IDX_TEXCOORDS; ++idx_size; }
sgWriteChar( fp, (char)SG_INDEX_TYPES ); // property
sgWriteUInt( fp, 1 ); // nbytes
sgWriteChar( fp, idx_mask );
// nbytes
sgWriteUInt( fp, (end - start) * 3 * idx_size * sizeof(short) );
// write group
for ( i = start; i < end; ++i ) {
for ( j = 0; j < 3; ++j ) {
if ( tris_v.size() ) {
sgWriteShort( fp, (short)tris_v[i][j] );
}
if ( tris_n.size() ) {
sgWriteShort( fp, (short)tris_n[i][j] );
}
if ( tris_c.size() ) {
sgWriteShort( fp, (short)tris_c[i][j] );
}
if ( tris_tc.size() ) {
sgWriteShort( fp, (short)tris_tc[i][j] );
}
}
}
start = end;
end = start + 1;
}
}
// dump triangle strips
if ( strips_v.size() > 0 ) {
int start = 0;
int end = 1;
string material;
while ( start < (int)strip_materials.size() ) {
// find next group
material = strip_materials[start];
while ( (end < (int)strip_materials.size()) &&
(material == strip_materials[end]) )
{
// cout << "end = " << end << endl;
end++;
}
// cout << "group = " << start << " to " << end - 1 << endl;
// write group headers
sgWriteChar( fp, (char)SG_TRIANGLE_STRIPS ); // type
sgWriteShort( fp, 2 ); // nproperties
sgWriteShort( fp, end - start ); // nelements
sgWriteChar( fp, (char)SG_MATERIAL ); // property
sgWriteUInt( fp, material.length() ); // nbytes
sgWriteBytes( fp, material.length(), material.c_str() );
idx_mask = 0;
idx_size = 0;
if ( strips_v.size() ) { idx_mask |= SG_IDX_VERTICES; ++idx_size; }
if ( strips_n.size() ) { idx_mask |= SG_IDX_NORMALS; ++idx_size; }
if ( strips_c.size() ) { idx_mask |= SG_IDX_COLORS; ++idx_size; }
if ( strips_tc.size() ) { idx_mask |= SG_IDX_TEXCOORDS; ++idx_size;}
sgWriteChar( fp, (char)SG_INDEX_TYPES ); // property
sgWriteUInt( fp, 1 ); // nbytes
sgWriteChar( fp, idx_mask );
// write strips
for ( i = start; i < end; ++i ) {
// nbytes
sgWriteUInt( fp, strips_v[i].size() * idx_size * sizeof(short));
for ( j = 0; j < (int)strips_v[i].size(); ++j ) {
if ( strips_v.size() ) {
sgWriteShort( fp, (short)strips_v[i][j] );
}
if ( strips_n.size() ) {
sgWriteShort( fp, (short)strips_n[i][j] );
}
if ( strips_c.size() ) {
sgWriteShort( fp, (short)strips_c[i][j] );
}
if ( strips_tc.size() ) {
sgWriteShort( fp, (short)strips_tc[i][j] );
}
}
}
start = end;
end = start + 1;
}
}
// dump triangle fans
if ( fans_v.size() > 0 ) {
int start = 0;
int end = 1;
string material;
while ( start < (int)fan_materials.size() ) {
// find next group
material = fan_materials[start];
while ( (end < (int)fan_materials.size()) &&
(material == fan_materials[end]) )
{
// cout << "end = " << end << endl;
end++;
}
// cout << "group = " << start << " to " << end - 1 << endl;
// write group headers
sgWriteChar( fp, (char)SG_TRIANGLE_FANS ); // type
sgWriteShort( fp, 2 ); // nproperties
sgWriteShort( fp, end - start ); // nelements
sgWriteChar( fp, (char)SG_MATERIAL ); // property
sgWriteUInt( fp, material.length() ); // nbytes
sgWriteBytes( fp, material.length(), material.c_str() );
idx_mask = 0;
idx_size = 0;
if ( fans_v.size() ) { idx_mask |= SG_IDX_VERTICES; ++idx_size; }
if ( fans_n.size() ) { idx_mask |= SG_IDX_NORMALS; ++idx_size; }
if ( fans_c.size() ) { idx_mask |= SG_IDX_COLORS; ++idx_size; }
if ( fans_tc.size() ) { idx_mask |= SG_IDX_TEXCOORDS; ++idx_size; }
sgWriteChar( fp, (char)SG_INDEX_TYPES ); // property
sgWriteUInt( fp, 1 ); // nbytes
sgWriteChar( fp, idx_mask );
// write fans
for ( i = start; i < end; ++i ) {
// nbytes
sgWriteUInt( fp, fans_v[i].size() * idx_size * sizeof(short) );
for ( j = 0; j < (int)fans_v[i].size(); ++j ) {
if ( fans_v.size() ) {
sgWriteShort( fp, (short)fans_v[i][j] );
}
if ( fans_n.size() ) {
sgWriteShort( fp, (short)fans_n[i][j] );
}
if ( fans_c.size() ) {
sgWriteShort( fp, (short)fans_c[i][j] );
}
if ( fans_tc.size() ) {
sgWriteShort( fp, (short)fans_tc[i][j] );
}
}
}
start = end;
end = start + 1;
}
}
// close the file
gzclose(fp);
if ( sgWriteError() ) {
cout << "We detected an error while writing the file." << endl;
return false;
}
return true;
}
// write out the structures to an ASCII file. We assume that the
// groups come to us sorted by material property. If not, things
// don't break, but the result won't be as optimal.
bool SGBinObject::write_ascii( const string& base, const string& name,
const SGBucket& b )
{
Point3D p;
int i, j;
string dir = base + "/" + b.gen_base_path();
string command = "mkdir -p " + dir;
#if defined(_MSC_VER) || defined(__MINGW32__)
system( (string("mkdir ") + dir).c_str() );
#else
system(command.c_str());
#endif
// string file = dir + "/" + b.gen_index_str();
string file = dir + "/" + name;
cout << "Output file = " << file << endl;
FILE *fp;
if ( (fp = fopen( file.c_str(), "w" )) == NULL ) {
cout << "ERROR: opening " << file << " for writing!" << endl;
return false;
}
cout << "triangles size = " << tris_v.size() << " tri_materials = "
<< tri_materials.size() << endl;
cout << "strips size = " << strips_v.size() << " strip_materials = "
<< strip_materials.size() << endl;
cout << "fans size = " << fans_v.size() << " fan_materials = "
<< fan_materials.size() << endl;
cout << "points = " << wgs84_nodes.size() << endl;
cout << "tex coords = " << texcoords.size() << endl;
// write headers
fprintf(fp, "# FGFS Scenery\n");
fprintf(fp, "# Version %s\n", SG_SCENERY_FILE_FORMAT);
time_t calendar_time = time(NULL);
struct tm *local_tm;
local_tm = localtime( &calendar_time );
char time_str[256];
strftime( time_str, 256, "%a %b %d %H:%M:%S %Z %Y", local_tm);
fprintf(fp, "# Created %s\n", time_str );
fprintf(fp, "\n");
// write bounding sphere
fprintf(fp, "# gbs %.5f %.5f %.5f %.2f\n",
gbs_center.x(), gbs_center.y(), gbs_center.z(), gbs_radius);
fprintf(fp, "\n");
// dump vertex list
fprintf(fp, "# vertex list\n");
for ( i = 0; i < (int)wgs84_nodes.size(); ++i ) {
p = wgs84_nodes[i] - gbs_center;
fprintf(fp, "v %.5f %.5f %.5f\n", p.x(), p.y(), p.z() );
}
fprintf(fp, "\n");
fprintf(fp, "# vertex normal list\n");
for ( i = 0; i < (int)normals.size(); ++i ) {
p = normals[i];
fprintf(fp, "vn %.5f %.5f %.5f\n", p.x(), p.y(), p.z() );
}
fprintf(fp, "\n");
// dump texture coordinates
fprintf(fp, "# texture coordinate list\n");
for ( i = 0; i < (int)texcoords.size(); ++i ) {
p = texcoords[i];
fprintf(fp, "vt %.5f %.5f\n", p.x(), p.y() );
}
fprintf(fp, "\n");
// dump individual triangles if they exist
if ( tris_v.size() > 0 ) {
fprintf(fp, "# triangle groups\n");
int start = 0;
int end = 1;
string material;
while ( start < (int)tri_materials.size() ) {
// find next group
material = tri_materials[start];
while ( (end < (int)tri_materials.size()) &&
(material == tri_materials[end]) )
{
// cout << "end = " << end << endl;
end++;
}
// cout << "group = " << start << " to " << end - 1 << endl;
// make a list of points for the group
point_list group_nodes;
group_nodes.clear();
Point3D bs_center;
double bs_radius = 0;
for ( i = start; i < end; ++i ) {
for ( j = 0; j < (int)tris_v[i].size(); ++j ) {
group_nodes.push_back( wgs84_nodes[ tris_v[i][j] ] );
bs_center = calc_center( group_nodes );
bs_radius = sgCalcBoundingRadius( bs_center, group_nodes );
}
}
// write group headers
fprintf(fp, "\n");
fprintf(fp, "# usemtl %s\n", material.c_str());
fprintf(fp, "# bs %.4f %.4f %.4f %.2f\n",
bs_center.x(), bs_center.y(), bs_center.z(), bs_radius);
// write groups
for ( i = start; i < end; ++i ) {
fprintf(fp, "f");
for ( j = 0; j < (int)tris_v[i].size(); ++j ) {
fprintf(fp, " %d/%d", tris_v[i][j], tris_tc[i][j] );
}
fprintf(fp, "\n");
}
start = end;
end = start + 1;
}
}
// dump triangle groups
if ( strips_v.size() > 0 ) {
fprintf(fp, "# triangle strips\n");
int start = 0;
int end = 1;
string material;
while ( start < (int)strip_materials.size() ) {
// find next group
material = strip_materials[start];
while ( (end < (int)strip_materials.size()) &&
(material == strip_materials[end]) )
{
// cout << "end = " << end << endl;
end++;
}
// cout << "group = " << start << " to " << end - 1 << endl;
// make a list of points for the group
point_list group_nodes;
group_nodes.clear();
Point3D bs_center;
double bs_radius = 0;
for ( i = start; i < end; ++i ) {
for ( j = 0; j < (int)strips_v[i].size(); ++j ) {
group_nodes.push_back( wgs84_nodes[ strips_v[i][j] ] );
bs_center = calc_center( group_nodes );
bs_radius = sgCalcBoundingRadius( bs_center, group_nodes );
}
}
// write group headers
fprintf(fp, "\n");
fprintf(fp, "# usemtl %s\n", material.c_str());
fprintf(fp, "# bs %.4f %.4f %.4f %.2f\n",
bs_center.x(), bs_center.y(), bs_center.z(), bs_radius);
// write groups
for ( i = start; i < end; ++i ) {
fprintf(fp, "ts");
for ( j = 0; j < (int)strips_v[i].size(); ++j ) {
fprintf(fp, " %d/%d", strips_v[i][j], strips_tc[i][j] );
}
fprintf(fp, "\n");
}
start = end;
end = start + 1;
}
}
// close the file
fclose(fp);
command = "gzip --force --best " + file;
system(command.c_str());
return true;
}
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