298 lines
11 KiB
C++
298 lines
11 KiB
C++
/**
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* \file sg_binobj.hxx
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* Routines to read and write the low level (binary) simgear 3d object format.
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*/
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// Written by Curtis Olson, started January 2000.
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//
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// Copyright (C) 2000 Curtis L. Olson - http://www.flightgear.org/~curt
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// $Id$
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#ifndef _SG_BINOBJ_HXX
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#define _SG_BINOBJ_HXX
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#include <zlib.h> // for gzFile
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#include <simgear/compiler.h>
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#include <simgear/constants.h>
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#include <simgear/math/sg_types.hxx>
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#include <simgear/math/SGMath.hxx>
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#include <array>
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#include <string>
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#include <vector>
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#define MAX_TC_SETS (4)
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#define MAX_VAS (8)
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typedef std::array<int_list, MAX_TC_SETS> tci_list;
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typedef std::array<int_list, MAX_VAS> vai_list;
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/** STL Structure used to store (integer index) object information */
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typedef std::vector < int_list > group_list;
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typedef group_list::iterator group_list_iterator;
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typedef group_list::const_iterator const_group_list_iterator;
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/** STL Structure used to store (tc index) object information */
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typedef std::vector < tci_list > group_tci_list;
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typedef group_tci_list::iterator group_tci_list_iterator;
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typedef group_tci_list::const_iterator const_group_tci_list_iterator;
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/** STL Structure used to store (va index) object information */
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typedef std::vector < vai_list > group_vai_list;
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typedef group_vai_list::iterator group_vai_list_iterator;
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typedef group_vai_list::const_iterator const_group_vai_list_iterator;
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// forward decls
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class SGBucket;
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class SGPath;
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class SGBinObjectPoint {
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public:
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std::string material;
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int_list v_list;
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int_list n_list;
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int_list c_list;
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void clear( void ) {
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material = "";
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v_list.clear();
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n_list.clear();
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c_list.clear();
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};
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};
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class SGBinObjectTriangle {
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public:
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std::string material;
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int_list v_list;
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int_list n_list;
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int_list c_list;
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tci_list tc_list;
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vai_list va_list;
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void clear( void ) {
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material = "";
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v_list.clear();
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n_list.clear();
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c_list.clear();
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for ( unsigned int i=0; i<MAX_TC_SETS; i++ ) {
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tc_list[i].clear();
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}
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for ( unsigned int i=0; i<MAX_VAS; i++ ) {
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va_list[i].clear();
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}
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};
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};
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/**
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* A class to manipulate the simgear 3d object format.
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* This class provides functionality to both read and write the binary format.
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*
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* Here is a really quick overview of the file syntax:
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*
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* - scenery-file: magic, nobjects, object+
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*
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* - magic: "TG" + version
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*
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* - object: obj_typecode, nproperties, nelements, property+, element+
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*
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* - element: nbytes, BYTE+
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*
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* - property: prop_typecode, nbytes, BYTE+
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*
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* - obj_typecode: bounding sphere | vertices | normals | texcoords |
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* points | triangles | fans | strips
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*
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* - prop_typecode: material_name | ???
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*
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* - nelements: USHORT (Gives us 65536 which ought to be enough, right?)
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*
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* - nproperties: USHORT
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*
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* - *_typecode: CHAR
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*
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* - nbytes: INTEGER (If we used short here that would mean 65536 bytes = 16384
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* floats = 5461 vertices which is not enough for future
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* growth)
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*
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* - vertex: FLOAT, FLOAT, FLOAT
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*/
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class SGBinObject {
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private:
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unsigned short version;
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SGVec3d gbs_center;
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float gbs_radius;
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std::vector<SGVec3d> wgs84_nodes; // vertex list
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std::vector<SGVec4f> colors; // color list
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std::vector<SGVec3f> normals; // normal list
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std::vector<SGVec2f> texcoords; // texture coordinate list
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std::vector<float> va_flt; // vertex attribute list (floats)
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std::vector<int> va_int; // vertex attribute list (ints)
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group_list pts_v; // points vertex index
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group_list pts_n; // points normal index
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group_list pts_c; // points color index
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group_tci_list pts_tcs; // points texture coordinates ( up to 4 sets )
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group_vai_list pts_vas; // points vertex attributes ( up to 8 sets )
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string_list pt_materials; // points materials
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group_list tris_v; // triangles vertex index
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group_list tris_n; // triangles normal index
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group_list tris_c; // triangles color index
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group_tci_list tris_tcs; // triangles texture coordinates ( up to 4 sets )
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group_vai_list tris_vas; // triangles vertex attributes ( up to 8 sets )
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string_list tri_materials; // triangles materials
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group_list strips_v; // tristrips vertex index
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group_list strips_n; // tristrips normal index
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group_list strips_c; // tristrips color index
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group_tci_list strips_tcs; // tristrips texture coordinates ( up to 4 sets )
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group_vai_list strips_vas; // tristrips vertex attributes ( up to 8 sets )
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string_list strip_materials; // tristrips materials
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group_list fans_v; // fans vertex index
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group_list fans_n; // fans normal index
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group_list fans_c; // fans color index
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group_tci_list fans_tcs; // fanss texture coordinates ( up to 4 sets )
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group_vai_list fans_vas; // fans vertex attributes ( up to 8 sets )
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string_list fan_materials; // fans materials
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void read_properties(gzFile fp, int nproperties);
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void read_object( gzFile fp,
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int obj_type,
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int nproperties,
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int nelements,
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group_list& vertices,
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group_list& normals,
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group_list& colors,
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group_tci_list& texCoords,
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group_vai_list& vertexAttribs,
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string_list& materials);
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void write_header(gzFile fp, int type, int nProps, int nElements);
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void write_objects(gzFile fp,
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int type,
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const group_list& verts,
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const group_list& normals,
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const group_list& colors,
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const group_tci_list& texCoords,
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const group_vai_list& vertexAttribs,
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const string_list& materials);
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unsigned int count_objects(const string_list& materials);
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public:
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inline unsigned short get_version() const { return version; }
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inline const SGVec3d& get_gbs_center() const { return gbs_center; }
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inline void set_gbs_center( const SGVec3d& p ) { gbs_center = p; }
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inline float get_gbs_radius() const { return gbs_radius; }
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inline void set_gbs_radius( float r ) { gbs_radius = r; }
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inline const std::vector<SGVec3d>& get_wgs84_nodes() const { return wgs84_nodes; }
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inline void set_wgs84_nodes( const std::vector<SGVec3d>& n ) { wgs84_nodes = n; }
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inline const std::vector<SGVec4f>& get_colors() const { return colors; }
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inline void set_colors( const std::vector<SGVec4f>& c ) { colors = c; }
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inline const std::vector<SGVec3f>& get_normals() const { return normals; }
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inline void set_normals( const std::vector<SGVec3f>& n ) { normals = n; }
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inline const std::vector<SGVec2f>& get_texcoords() const { return texcoords; }
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inline void set_texcoords( const std::vector<SGVec2f>& t ) { texcoords = t; }
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// Points API
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bool add_point( const SGBinObjectPoint& pt );
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inline const group_list& get_pts_v() const { return pts_v; }
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inline const group_list& get_pts_n() const { return pts_n; }
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inline const group_tci_list& get_pts_tcs() const { return pts_tcs; }
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inline const group_vai_list& get_pts_vas() const { return pts_vas; }
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inline const string_list& get_pt_materials() const { return pt_materials; }
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// Triangles API
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bool add_triangle( const SGBinObjectTriangle& tri );
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inline const group_list& get_tris_v() const { return tris_v; }
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inline const group_list& get_tris_n() const { return tris_n; }
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inline const group_list& get_tris_c() const { return tris_c; }
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inline const group_tci_list& get_tris_tcs() const { return tris_tcs; }
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inline const group_vai_list& get_tris_vas() const { return tris_vas; }
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inline const string_list& get_tri_materials() const { return tri_materials; }
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// Strips API (deprecated - read only)
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inline const group_list& get_strips_v() const { return strips_v; }
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inline const group_list& get_strips_n() const { return strips_n; }
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inline const group_list& get_strips_c() const { return strips_c; }
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inline const group_tci_list& get_strips_tcs() const { return strips_tcs; }
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inline const group_vai_list& get_strips_vas() const { return strips_vas; }
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inline const string_list& get_strip_materials() const { return strip_materials; }
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// Fans API (deprecated - read only )
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inline const group_list& get_fans_v() const { return fans_v; }
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inline const group_list& get_fans_n() const { return fans_n; }
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inline const group_list& get_fans_c() const { return fans_c; }
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inline const group_tci_list& get_fans_tcs() const { return fans_tcs; }
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inline const group_vai_list& get_fans_vas() const { return fans_vas; }
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inline const string_list& get_fan_materials() const { return fan_materials; }
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/**
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* Read a binary file object and populate the provided structures.
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* @param file input file name
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* @return result of read
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*/
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bool read_bin( const SGPath& file );
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/**
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* Write out the structures to a binary file. We assume that the
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* groups come to us sorted by material property. If not, things
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* don't break, but the result won't be as optimal.
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* @param base name of output path
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* @param name name of output file
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* @param b bucket for object location
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* @return result of write
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*/
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bool write_bin( const std::string& base, const std::string& name, const SGBucket& b );
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bool write_bin_file(const SGPath& file);
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/**
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* Write out the structures to an ASCII file. We assume that the
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* groups come to us sorted by material property. If not, things
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* don't break, but the result won't be as optimal.
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* @param base name of output path
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* @param name name of output file
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* @param b bucket for object location
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* @return result of write
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*/
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bool write_ascii( const std::string& base, const std::string& name,
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const SGBucket& b );
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};
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#endif // _SG_BINOBJ_HXX
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