// tile.hxx -- routines to handle a scenery tile
//
// Written by Curtis Olson, started May 1998.
//
// Copyright (C) 1998  Curtis L. Olson  - curt@infoplane.com
//
// 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.
//
// $Id$
// (Log is kept at end of this file)


#ifndef _TILE_HXX
#define _TILE_HXX


#ifndef __cplusplus                                                          
# error This library requires C++
#endif                                   

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

#ifdef HAVE_WINDOWS_H
#  include <windows.h>
#endif

#include <GL/glut.h>
#include <XGL/xgl.h>

#include <vector>
#include <string>

#include "Include/compiler.h"
#include STL_FUNCTIONAL
#include STL_ALGORITHM
FG_USING_NAMESPACE(std);
// FG_USING_STD(string);
// FG_USING_STD(vector);

#include <Bucket/bucketutils.h>
#include <Math/mat3.h>
#include <Math/point3d.hxx>
#include <Objects/fragment.hxx>


// Scenery tile class
class fgTILE {

public:

    typedef vector < fgFRAGMENT > container;
    typedef container::iterator FragmentIterator;
    typedef container::const_iterator FragmentConstIterator;

public:
    // node list (the per fragment face lists reference this node list)
    double (*nodes)[3];
    int ncount;

    // culling data for whole tile (course grain culling)
    Point3D center;
    double bounding_radius;
    Point3D offset;
    GLdouble model_view[16];

    // this tile's official location in the world
    fgBUCKET tile_bucket;

    // the tile cache will mark here if the tile is being used
    bool used;

    container fragment_list;

public:

    FragmentIterator begin() { return fragment_list.begin(); }
    FragmentConstIterator begin() const { return fragment_list.begin(); }

    FragmentIterator end() { return fragment_list.end(); }
    FragmentConstIterator end() const { return fragment_list.end(); }

    void add_fragment( fgFRAGMENT& frag ) {
 	frag.tile_ptr = this;
	fragment_list.push_back( frag );
    }

    //
    size_t num_fragments() const {
	return fragment_list.size();
    }

    // Step through the fragment list, deleting the display list, then
    // the fragment, until the list is empty.
    void release_fragments();

//     int ObjLoad( const string& path, const fgBUCKET& p );

    // Constructor
    fgTILE ( void );

    // Destructor
    ~fgTILE ( void );

    // Calculate this tile's offset
    void SetOffset( const Point3D& off)
    {
	offset = center - off;
    }


    // Calculate the model_view transformation matrix for this tile
    inline void
    UpdateViewMatrix(GLdouble *MODEL_VIEW)
    {

#if defined( USE_MEM ) || defined( WIN32 )
	memcpy( model_view, MODEL_VIEW, 16*sizeof(GLdouble) );
#else 
	bcopy( MODEL_VIEW, model_view, 16*sizeof(GLdouble) );
#endif
	
	// This is equivalent to doing a glTranslatef(x, y, z);
	model_view[12] += (model_view[0]*offset.x() +
			   model_view[4]*offset.y() +
			   model_view[8]*offset.z());
	model_view[13] += (model_view[1]*offset.x() +
			   model_view[5]*offset.y() +
			   model_view[9]*offset.z());
	model_view[14] += (model_view[2]*offset.x() +
			   model_view[6]*offset.y() +
			   model_view[10]*offset.z() );
	// m[15] += (m[3]*x + m[7]*y + m[11]*z);
	// m[3] m7[] m[11] are 0.0 see LookAt() in views.cxx
	// so m[15] is unchanged
    }

private:

    // not defined
    fgTILE( const fgTILE& );
    fgTILE& operator = ( const fgTILE& );
};


#endif // _TILE_HXX 


// $Log$
// Revision 1.22  1998/12/03 01:18:16  curt
// Converted fgFLIGHT to a class.
// Tweaks for Sun Portability.
// Tweaked current terrain elevation code as per NHV.
//
// Revision 1.21  1998/11/09 23:40:47  curt
// Bernie Bright <bbright@c031.aone.net.au> writes:
// I've made some changes to the Scenery handling.  Basically just tidy ups.
// The main difference is in tile.[ch]xx where I've changed list<fgFRAGMENT> to
// vector<fgFRAGMENT>.  Studying our usage patterns this seems reasonable.
// Lists are good if you need to insert/delete elements randomly but we
// don't do that.  All access seems to be sequential.  Two additional
// benefits are smaller memory usage - each list element requires pointers
// to the next and previous elements, and faster access - vector iterators
// are smaller and faster than list iterators.  This should also help
// Charlie Hotchkiss' problem when compiling with Borland and STLport.
//
// ./Lib/Bucket/bucketutils.hxx
//   Convenience functions for fgBUCKET.
//
// ./Simulator/Scenery/tile.cxx
// ./Simulator/Scenery/tile.hxx
//   Changed fragment list to a vector.
//   Added some convenience member functions.
//
// ./Simulator/Scenery/tilecache.cxx
// ./Simulator/Scenery/tilecache.hxx
//   use const fgBUCKET& instead of fgBUCKET* where appropriate.
//
// ./Simulator/Scenery/tilemgr.cxx
// ./Simulator/Scenery/tilemgr.hxx
//   uses all the new convenience functions.
//
// Revision 1.20  1998/10/16 00:55:46  curt
// Converted to Point3D class.
//
// Revision 1.19  1998/09/17 18:36:17  curt
// Tweaks and optimizations by Norman Vine.
//
// Revision 1.18  1998/08/25 16:52:42  curt
// material.cxx material.hxx obj.cxx obj.hxx texload.c texload.h moved to
//   ../Objects
//
// Revision 1.17  1998/08/22  14:49:58  curt
// Attempting to iron out seg faults and crashes.
// Did some shuffling to fix a initialization order problem between view
// position, scenery elevation.
//
// Revision 1.16  1998/08/22 02:01:34  curt
// increased fragment list size.
//
// Revision 1.15  1998/08/20 15:12:06  curt
// Used a forward declaration of classes fgTILE and fgMATERIAL to eliminate
// the need for "void" pointers and casts.
// Quick hack to count the number of scenery polygons that are being drawn.
//
// Revision 1.14  1998/08/12 21:13:06  curt
// material.cxx: don't load textures if they are disabled
// obj.cxx: optimizations from Norman Vine
// tile.cxx: minor tweaks
// tile.hxx: addition of num_faces
// tilemgr.cxx: minor tweaks
//
// Revision 1.13  1998/07/24 21:42:08  curt
// material.cxx: whups, double method declaration with no definition.
// obj.cxx: tweaks to avoid errors in SGI's CC.
// tile.cxx: optimizations by Norman Vine.
// tilemgr.cxx: optimizations by Norman Vine.
//
// Revision 1.12  1998/07/22 21:41:42  curt
// Add basic fgFACE methods contributed by Charlie Hotchkiss.
// intersect optimization from Norman Vine.
//
// Revision 1.11  1998/07/12 03:18:28  curt
// Added ground collision detection.  This involved:
// - saving the entire vertex list for each tile with the tile records.
// - saving the face list for each fragment with the fragment records.
// - code to intersect the current vertical line with the proper face in
//   an efficient manner as possible.
// Fixed a bug where the tiles weren't being shifted to "near" (0,0,0)
//
// Revision 1.10  1998/07/08 14:47:22  curt
// Fix GL_MODULATE vs. GL_DECAL problem introduced by splash screen.
// polare3d.h renamed to polar3d.hxx
// fg{Cartesian,Polar}Point3d consolodated.
// Added some initial support for calculating local current ground elevation.
//
// Revision 1.9  1998/07/06 21:34:34  curt
// Added using namespace std for compilers that support this.
//
// Revision 1.8  1998/07/04 00:54:30  curt
// Added automatic mipmap generation.
//
// When rendering fragments, use saved model view matrix from associated tile
// rather than recalculating it with push() translate() pop().
//
// Revision 1.7  1998/06/12 00:58:05  curt
// Build only static libraries.
// Declare memmove/memset for Sloaris.
//
// Revision 1.6  1998/06/08 17:57:54  curt
// Working first pass at material proporty sorting.
//
// Revision 1.5  1998/06/06 01:09:32  curt
// I goofed on the log message in the last commit ... now fixed.
//
// Revision 1.4  1998/06/06 01:07:18  curt
// Increased per material fragment list size from 100 to 400.
// Now correctly draw viewable fragments in per material order.
//
// Revision 1.3  1998/06/05 22:39:54  curt
// Working on sorting by, and rendering by material properties.
//
// Revision 1.2  1998/06/03 00:47:50  curt
// No .h for STL includes.
// Minor view culling optimizations.
//
// Revision 1.1  1998/05/23 14:09:21  curt
// Added tile.cxx and tile.hxx.
// Working on rewriting the tile management system so a tile is just a list
// fragments, and the fragment record contains the display list for that fragment.
//