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 // Maximum nodes per tile
56 #define MAX_NODES 2000
59 // Forward declarations
63 // Object fragment data class
70 fgFACE( int a = 0, int b =0, int c =0 )
71 : n1(a), n2(b), n3(c) {}
73 fgFACE( const fgFACE & image )
74 : n1(image.n1), n2(image.n2), n3(image.n3) {}
76 fgFACE& operator= ( const fgFACE & image ) {
77 n1 = image.n1; n2 = image.n2; n3 = image.n3; return *this;
84 // culling data for this object fragment (fine grain culling)
86 double bounding_radius;
88 // variable offset data for this object fragment for this frame
89 // fgCartesianPoint3d tile_offset;
91 // saved transformation matrix for this fragment (used by renderer)
92 // GLfloat matrix[16];
94 // tile_ptr & material_ptr are set so that when we traverse the
95 // list of fragments we can quickly reference back the tile or
96 // material property this fragment is assigned to.
98 // material property pointer
99 fgMATERIAL *material_ptr;
104 // OpenGL display list for fragment data
107 // face list (this indexes into the master tile vertex list)
108 typedef vector < fgFACE > container;
109 typedef container::iterator iterator;
110 typedef container::const_iterator const_iterator;
116 // number of faces in this fragment
121 // Add a face to the face list
122 void add_face(int n1, int n2, int n3) {
123 faces.push_back( fgFACE(n1,n2,n3) );
126 // test if line intesects with this fragment. p0 and p1 are the
127 // two line end points of the line. If side_flag is true, check
128 // to see that end points are on opposite sides of face. Returns
129 // 1 if it intersection found, 0 otherwise. If it intesects,
130 // result is the point of intersection
131 int intersect( const Point3D& end0,
134 Point3D& result) const;
137 fgFRAGMENT () { /*faces.reserve(512);*/}
138 fgFRAGMENT ( const fgFRAGMENT &image );
141 ~fgFRAGMENT() { faces.erase( faces.begin(), faces.end() ); }
144 fgFRAGMENT & operator = ( const fgFRAGMENT & rhs );
146 bool operator < ( const fgFRAGMENT & rhs ) const {
147 // This is completely arbitrary. It satisfies RW's STL implementation
148 return bounding_radius < rhs.bounding_radius;
152 faces.erase( faces.begin(), faces.end() );
155 int deleteDisplayList() const {
156 xglDeleteLists( display_list, 1 ); return 0;
159 friend bool operator== ( const fgFRAGMENT::fgFACE & lhs,
160 const fgFRAGMENT::fgFACE & rhs );
161 friend bool operator== ( const fgFRAGMENT & lhs, const fgFRAGMENT & rhs );
165 operator== ( const fgFRAGMENT::fgFACE& lhs,
166 const fgFRAGMENT::fgFACE& rhs )
168 return (lhs.n1 == rhs.n1) && (lhs.n2 == rhs.n2) && (lhs.n3 == rhs.n3);
172 operator == ( const fgFRAGMENT & lhs, const fgFRAGMENT & rhs ) {
173 return lhs.center == rhs.center;
177 #endif // _FRAGMENT_HXX
181 // Revision 1.9 1999/03/02 01:03:23 curt
182 // Tweaks for building with native SGI compilers.
184 // Revision 1.8 1999/02/26 22:09:57 curt
185 // Added initial support for native SGI compilers.
187 // Revision 1.7 1998/11/02 18:29:00 curt
188 // Portability changes for the Borland compiler.
190 // Revision 1.6 1998/10/16 00:54:38 curt
191 // Converted to Point3D class.
193 // Revision 1.5 1998/09/15 01:35:04 curt
194 // cleaned up my fragment.num_faces hack :-) to use the STL (no need in
195 // duplicating work.)
196 // Tweaked fgTileMgrRender() do not calc tile matrix unless necessary.
197 // removed some unneeded stuff from fgTileMgrCurElev()
199 // Revision 1.4 1998/09/10 19:07:09 curt
200 // /Simulator/Objects/fragment.hxx
201 // Nested fgFACE inside fgFRAGMENT since its not used anywhere else.
203 // ./Simulator/Objects/material.cxx
204 // ./Simulator/Objects/material.hxx
205 // Made fgMATERIAL and fgMATERIAL_MGR bona fide classes with private
206 // data members - that should keep the rabble happy :)
208 // ./Simulator/Scenery/tilemgr.cxx
209 // In viewable() delay evaluation of eye[0] and eye[1] in until they're
211 // Change to fgTileMgrRender() to call fgMATERIAL_MGR::render_fragments()
214 // ./Include/fg_stl_config.h
215 // ./Include/auto_ptr.hxx
216 // Added support for g++ 2.7.
217 // Further changes to other files are forthcoming.
219 // Brief summary of changes required for g++ 2.7.
220 // operator->() not supported by iterators: use (*i).x instead of i->x
221 // default template arguments not supported,
222 // <functional> doesn't have mem_fun_ref() needed by callbacks.
223 // some std include files have different names.
224 // template member functions not supported.
226 // Revision 1.3 1998/09/08 21:40:44 curt
227 // Updates from Bernie Bright.
229 // Revision 1.2 1998/09/01 19:03:08 curt
230 // Changes contributed by Bernie Bright <bbright@c031.aone.net.au>
231 // - The new classes in libmisc.tgz define a stream interface into zlib.
232 // I've put these in a new directory, Lib/Misc. Feel free to rename it
233 // to something more appropriate. However you'll have to change the
234 // include directives in all the other files. Additionally you'll have
235 // add the library to Lib/Makefile.am and Simulator/Main/Makefile.am.
237 // The StopWatch class in Lib/Misc requires a HAVE_GETRUSAGE autoconf
238 // test so I've included the required changes in config.tgz.
240 // There are a fair few changes to Simulator/Objects as I've moved
241 // things around. Loading tiles is quicker but thats not where the delay
242 // is. Tile loading takes a few tenths of a second per file on a P200
243 // but it seems to be the post-processing that leads to a noticeable
244 // blip in framerate. I suppose its time to start profiling to see where
247 // I've included a brief description of each archives contents.
252 // C++ stream interface into zlib.
253 // Taken from zlib-1.1.3/contrib/iostream/.
254 // Minor mods for STL compatibility.
255 // There's no copyright associated with these so I assume they're
256 // covered by zlib's.
260 // FlightGear input stream using gz_ifstream. Tries to open the
261 // given filename. If that fails then filename is examined and a
262 // ".gz" suffix is removed or appended and that file is opened.
265 // A simple timer for benchmarking. Not used in production code.
266 // Taken from the Blitz++ project. Covered by GPL.
270 // Some simple string manipulation routines.
272 // Simulator/Airports/
273 // Load airports database using fgstream.
274 // Changed fgAIRPORTS to use set<> instead of map<>.
275 // Added bool fgAIRPORTS::search() as a neater way doing the lookup.
276 // Returns true if found.
279 // Modified fgStarsInit() to load stars database using fgstream.
281 // Simulator/Objects/
282 // Modified fgObjLoad() to use fgstream.
283 // Modified fgMATERIAL_MGR::load_lib() to use fgstream.
284 // Many changes to fgMATERIAL.
285 // Some changes to fgFRAGMENT but I forget what!
287 // Revision 1.1 1998/08/25 16:51:23 curt
288 // Moved from ../Scenery