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 <Include/fg_constants.h>
49 #include <Math/mat3.h>
50 #include <Math/point3d.hxx>
58 fgFACE( int a = 0, int b =0, int c =0 )
59 : n1(a), n2(b), n3(c) {}
61 fgFACE( const fgFACE & image )
62 : n1(image.n1), n2(image.n2), n3(image.n3) {}
64 fgFACE& operator= ( const fgFACE & image ) {
65 n1 = image.n1; n2 = image.n2; n3 = image.n3; return *this;
72 operator== ( const fgFACE& lhs, const fgFACE& rhs )
74 return (lhs.n1 == rhs.n1) && (lhs.n2 == rhs.n2) && (lhs.n3 == rhs.n3);
77 // Forward declarations
81 // Object fragment data class
87 // culling data for this object fragment (fine grain culling)
89 double bounding_radius;
91 // variable offset data for this object fragment for this frame
92 // fgCartesianPoint3d tile_offset;
94 // saved transformation matrix for this fragment (used by renderer)
95 // GLfloat matrix[16];
97 // tile_ptr & material_ptr are set so that when we traverse the
98 // list of fragments we can quickly reference back the tile or
99 // material property this fragment is assigned to.
101 // material property pointer
102 fgMATERIAL *material_ptr;
107 // OpenGL display list for fragment data
110 // face list (this indexes into the master tile vertex list)
111 typedef vector < fgFACE > container;
112 typedef container::iterator iterator;
113 typedef container::const_iterator const_iterator;
119 // number of faces in this fragment
124 // Add a face to the face list
125 void add_face(int n1, int n2, int n3) {
126 faces.push_back( fgFACE(n1,n2,n3) );
129 // test if line intesects with this fragment. p0 and p1 are the
130 // two line end points of the line. If side_flag is true, check
131 // to see that end points are on opposite sides of face. Returns
132 // 1 if it intersection found, 0 otherwise. If it intesects,
133 // result is the point of intersection
134 int intersect( const Point3D& end0,
137 Point3D& result) const;
140 fgFRAGMENT () { /*faces.reserve(512);*/}
141 fgFRAGMENT ( const fgFRAGMENT &image );
144 ~fgFRAGMENT() { faces.erase( faces.begin(), faces.end() ); }
147 fgFRAGMENT & operator = ( const fgFRAGMENT & rhs );
149 bool operator < ( const fgFRAGMENT & rhs ) const {
150 // This is completely arbitrary. It satisfies RW's STL implementation
151 return bounding_radius < rhs.bounding_radius;
155 faces.erase( faces.begin(), faces.end() );
158 int deleteDisplayList() {
159 xglDeleteLists( display_list, 1 ); return 0;
162 friend bool operator== ( const fgFRAGMENT & lhs, const fgFRAGMENT & rhs );
166 operator == ( const fgFRAGMENT & lhs, const fgFRAGMENT & rhs ) {
167 return lhs.center == rhs.center;
171 #endif // _FRAGMENT_HXX
175 // Revision 1.1 1999/04/05 21:32:49 curt
178 // Revision 1.12 1999/04/05 02:14:21 curt
179 // Moved max node per tile definition to fg_constants.h
181 // Revision 1.11 1999/03/25 19:02:53 curt
182 // Removed an unneeded include.
184 // Revision 1.10 1999/03/15 17:59:12 curt
185 // MSVC++ portability tweaks contributed by Bernie Bright.
186 // Un-nested struct fgFace.
187 // Made fgFragment::deleteDisplayList() a non-const member.
189 // Revision 1.9 1999/03/02 01:03:23 curt
190 // Tweaks for building with native SGI compilers.
192 // Revision 1.8 1999/02/26 22:09:57 curt
193 // Added initial support for native SGI compilers.
195 // Revision 1.7 1998/11/02 18:29:00 curt
196 // Portability changes for the Borland compiler.
198 // Revision 1.6 1998/10/16 00:54:38 curt
199 // Converted to Point3D class.
201 // Revision 1.5 1998/09/15 01:35:04 curt
202 // cleaned up my fragment.num_faces hack :-) to use the STL (no need in
203 // duplicating work.)
204 // Tweaked fgTileMgrRender() do not calc tile matrix unless necessary.
205 // removed some unneeded stuff from fgTileMgrCurElev()
207 // Revision 1.4 1998/09/10 19:07:09 curt
208 // /Simulator/Objects/fragment.hxx
209 // Nested fgFACE inside fgFRAGMENT since its not used anywhere else.
211 // ./Simulator/Objects/material.cxx
212 // ./Simulator/Objects/material.hxx
213 // Made fgMATERIAL and fgMATERIAL_MGR bona fide classes with private
214 // data members - that should keep the rabble happy :)
216 // ./Simulator/Scenery/tilemgr.cxx
217 // In viewable() delay evaluation of eye[0] and eye[1] in until they're
219 // Change to fgTileMgrRender() to call fgMATERIAL_MGR::render_fragments()
222 // ./Include/fg_stl_config.h
223 // ./Include/auto_ptr.hxx
224 // Added support for g++ 2.7.
225 // Further changes to other files are forthcoming.
227 // Brief summary of changes required for g++ 2.7.
228 // operator->() not supported by iterators: use (*i).x instead of i->x
229 // default template arguments not supported,
230 // <functional> doesn't have mem_fun_ref() needed by callbacks.
231 // some std include files have different names.
232 // template member functions not supported.
234 // Revision 1.3 1998/09/08 21:40:44 curt
235 // Updates from Bernie Bright.
237 // Revision 1.2 1998/09/01 19:03:08 curt
238 // Changes contributed by Bernie Bright <bbright@c031.aone.net.au>
239 // - The new classes in libmisc.tgz define a stream interface into zlib.
240 // I've put these in a new directory, Lib/Misc. Feel free to rename it
241 // to something more appropriate. However you'll have to change the
242 // include directives in all the other files. Additionally you'll have
243 // add the library to Lib/Makefile.am and Simulator/Main/Makefile.am.
245 // The StopWatch class in Lib/Misc requires a HAVE_GETRUSAGE autoconf
246 // test so I've included the required changes in config.tgz.
248 // There are a fair few changes to Simulator/Objects as I've moved
249 // things around. Loading tiles is quicker but thats not where the delay
250 // is. Tile loading takes a few tenths of a second per file on a P200
251 // but it seems to be the post-processing that leads to a noticeable
252 // blip in framerate. I suppose its time to start profiling to see where
255 // I've included a brief description of each archives contents.
260 // C++ stream interface into zlib.
261 // Taken from zlib-1.1.3/contrib/iostream/.
262 // Minor mods for STL compatibility.
263 // There's no copyright associated with these so I assume they're
264 // covered by zlib's.
268 // FlightGear input stream using gz_ifstream. Tries to open the
269 // given filename. If that fails then filename is examined and a
270 // ".gz" suffix is removed or appended and that file is opened.
273 // A simple timer for benchmarking. Not used in production code.
274 // Taken from the Blitz++ project. Covered by GPL.
278 // Some simple string manipulation routines.
280 // Simulator/Airports/
281 // Load airports database using fgstream.
282 // Changed fgAIRPORTS to use set<> instead of map<>.
283 // Added bool fgAIRPORTS::search() as a neater way doing the lookup.
284 // Returns true if found.
287 // Modified fgStarsInit() to load stars database using fgstream.
289 // Simulator/Objects/
290 // Modified fgObjLoad() to use fgstream.
291 // Modified fgMATERIAL_MGR::load_lib() to use fgstream.
292 // Many changes to fgMATERIAL.
293 // Some changes to fgFRAGMENT but I forget what!
295 // Revision 1.1 1998/08/25 16:51:23 curt
296 // Moved from ../Scenery