1 // fragment.hxx -- routines to handle "atomic" display objects
3 // Written by Curtis Olson, started August 1998.
5 // Copyright (C) 1998 Curtis L. Olson - curt@me.umn.edu
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // 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., 675 Mass Ave, Cambridge, MA 02139, USA.
22 // (Log is kept at end of this file)
30 # error This library requires C++
44 #include <Include/compiler.h>
48 #include <Bucket/bucketutils.h>
49 #include <Include/fg_constants.h>
50 #include <Math/mat3.h>
51 #include <Math/point3d.hxx>
55 #ifdef FG_HAVE_NATIVE_SGI_COMPILERS
56 FG_USING_NAMESPACE(std);
59 // Maximum nodes per tile
60 #define MAX_NODES 2000
63 // Forward declarations
67 // Object fragment data class
74 fgFACE( int a = 0, int b =0, int c =0 )
75 : n1(a), n2(b), n3(c) {}
77 fgFACE( const fgFACE & image )
78 : n1(image.n1), n2(image.n2), n3(image.n3) {}
80 fgFACE& operator= ( const fgFACE & image ) {
81 n1 = image.n1; n2 = image.n2; n3 = image.n3; return *this;
88 // culling data for this object fragment (fine grain culling)
90 double bounding_radius;
92 // variable offset data for this object fragment for this frame
93 // fgCartesianPoint3d tile_offset;
95 // saved transformation matrix for this fragment (used by renderer)
96 // GLfloat matrix[16];
98 // tile_ptr & material_ptr are set so that when we traverse the
99 // list of fragments we can quickly reference back the tile or
100 // material property this fragment is assigned to.
102 // material property pointer
103 fgMATERIAL *material_ptr;
108 // OpenGL display list for fragment data
111 // face list (this indexes into the master tile vertex list)
112 typedef vector < fgFACE > container;
113 typedef container::iterator iterator;
114 typedef container::const_iterator const_iterator;
120 // number of faces in this fragment
125 // Add a face to the face list
126 void add_face(int n1, int n2, int n3) {
127 faces.push_back( fgFACE(n1,n2,n3) );
130 // test if line intesects with this fragment. p0 and p1 are the
131 // two line end points of the line. If side_flag is true, check
132 // to see that end points are on opposite sides of face. Returns
133 // 1 if it intersection found, 0 otherwise. If it intesects,
134 // result is the point of intersection
135 int intersect( const Point3D& end0,
138 Point3D& result) const;
141 fgFRAGMENT () { /*faces.reserve(512);*/}
142 fgFRAGMENT ( const fgFRAGMENT &image );
145 ~fgFRAGMENT() { faces.erase( faces.begin(), faces.end() ); }
148 fgFRAGMENT & operator = ( const fgFRAGMENT & rhs );
150 bool operator < ( const fgFRAGMENT & rhs ) const {
151 // This is completely arbitrary. It satisfies RW's STL implementation
152 return bounding_radius < rhs.bounding_radius;
156 faces.erase( faces.begin(), faces.end() );
159 int deleteDisplayList() const {
160 xglDeleteLists( display_list, 1 ); return 0;
163 friend bool operator== ( const fgFRAGMENT::fgFACE & lhs,
164 const fgFRAGMENT::fgFACE & rhs );
165 friend bool operator== ( const fgFRAGMENT & lhs, const fgFRAGMENT & rhs );
169 operator== ( const fgFRAGMENT::fgFACE& lhs,
170 const fgFRAGMENT::fgFACE& rhs )
172 return (lhs.n1 == rhs.n1) && (lhs.n2 == rhs.n2) && (lhs.n3 == rhs.n3);
176 operator == ( const fgFRAGMENT & lhs, const fgFRAGMENT & rhs ) {
177 return lhs.center == rhs.center;
181 #endif // _FRAGMENT_HXX
185 // Revision 1.8 1999/02/26 22:09:57 curt
186 // Added initial support for native SGI compilers.
188 // Revision 1.7 1998/11/02 18:29:00 curt
189 // Portability changes for the Borland compiler.
191 // Revision 1.6 1998/10/16 00:54:38 curt
192 // Converted to Point3D class.
194 // Revision 1.5 1998/09/15 01:35:04 curt
195 // cleaned up my fragment.num_faces hack :-) to use the STL (no need in
196 // duplicating work.)
197 // Tweaked fgTileMgrRender() do not calc tile matrix unless necessary.
198 // removed some unneeded stuff from fgTileMgrCurElev()
200 // Revision 1.4 1998/09/10 19:07:09 curt
201 // /Simulator/Objects/fragment.hxx
202 // Nested fgFACE inside fgFRAGMENT since its not used anywhere else.
204 // ./Simulator/Objects/material.cxx
205 // ./Simulator/Objects/material.hxx
206 // Made fgMATERIAL and fgMATERIAL_MGR bona fide classes with private
207 // data members - that should keep the rabble happy :)
209 // ./Simulator/Scenery/tilemgr.cxx
210 // In viewable() delay evaluation of eye[0] and eye[1] in until they're
212 // Change to fgTileMgrRender() to call fgMATERIAL_MGR::render_fragments()
215 // ./Include/fg_stl_config.h
216 // ./Include/auto_ptr.hxx
217 // Added support for g++ 2.7.
218 // Further changes to other files are forthcoming.
220 // Brief summary of changes required for g++ 2.7.
221 // operator->() not supported by iterators: use (*i).x instead of i->x
222 // default template arguments not supported,
223 // <functional> doesn't have mem_fun_ref() needed by callbacks.
224 // some std include files have different names.
225 // template member functions not supported.
227 // Revision 1.3 1998/09/08 21:40:44 curt
228 // Updates from Bernie Bright.
230 // Revision 1.2 1998/09/01 19:03:08 curt
231 // Changes contributed by Bernie Bright <bbright@c031.aone.net.au>
232 // - The new classes in libmisc.tgz define a stream interface into zlib.
233 // I've put these in a new directory, Lib/Misc. Feel free to rename it
234 // to something more appropriate. However you'll have to change the
235 // include directives in all the other files. Additionally you'll have
236 // add the library to Lib/Makefile.am and Simulator/Main/Makefile.am.
238 // The StopWatch class in Lib/Misc requires a HAVE_GETRUSAGE autoconf
239 // test so I've included the required changes in config.tgz.
241 // There are a fair few changes to Simulator/Objects as I've moved
242 // things around. Loading tiles is quicker but thats not where the delay
243 // is. Tile loading takes a few tenths of a second per file on a P200
244 // but it seems to be the post-processing that leads to a noticeable
245 // blip in framerate. I suppose its time to start profiling to see where
248 // I've included a brief description of each archives contents.
253 // C++ stream interface into zlib.
254 // Taken from zlib-1.1.3/contrib/iostream/.
255 // Minor mods for STL compatibility.
256 // There's no copyright associated with these so I assume they're
257 // covered by zlib's.
261 // FlightGear input stream using gz_ifstream. Tries to open the
262 // given filename. If that fails then filename is examined and a
263 // ".gz" suffix is removed or appended and that file is opened.
266 // A simple timer for benchmarking. Not used in production code.
267 // Taken from the Blitz++ project. Covered by GPL.
271 // Some simple string manipulation routines.
273 // Simulator/Airports/
274 // Load airports database using fgstream.
275 // Changed fgAIRPORTS to use set<> instead of map<>.
276 // Added bool fgAIRPORTS::search() as a neater way doing the lookup.
277 // Returns true if found.
280 // Modified fgStarsInit() to load stars database using fgstream.
282 // Simulator/Objects/
283 // Modified fgObjLoad() to use fgstream.
284 // Modified fgMATERIAL_MGR::load_lib() to use fgstream.
285 // Many changes to fgMATERIAL.
286 // Some changes to fgFRAGMENT but I forget what!
288 // Revision 1.1 1998/08/25 16:51:23 curt
289 // Moved from ../Scenery