timoore
d4289c5d54
The (random) dimensions of a large number of trees is stored in an array shared by all the tree geodes. The coordinates of the origin of each tree are replicated in an another array. This allows an entire block of trees to be rendered with a few OpenGL calls, instead of one function call per tree.
68 lines
1.6 KiB
C++
68 lines
1.6 KiB
C++
/* -*-c++-*-
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*
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* Copyright (C) 2008 Stuart Buchanan
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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,
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* MA 02110-1301, USA.
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*
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*/
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#ifndef TREE_BIN_HXX
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#define TREE_BIN_HXX
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#include <vector>
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#include <string>
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#include <osg/Geometry>
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#include <osg/Group>
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#include <osg/Matrix>
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#include <simgear/math/SGMath.hxx>
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namespace simgear
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{
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class TreeBin {
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public:
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struct Tree {
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Tree(const SGVec3f& p) :
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position(p)
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{ }
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SGVec3f position;
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};
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typedef std::vector<Tree> TreeList;
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int texture_varieties;
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double range;
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float height;
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float width;
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std::string texture;
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void insert(const Tree& t)
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{ _trees.push_back(t); }
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void insert(const SGVec3f& p, int t, float s)
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{ insert(Tree(p)); }
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unsigned getNumTrees() const
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{ return _trees.size(); }
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const Tree& getTree(unsigned i) const
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{ return _trees[i]; }
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TreeList _trees;
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};
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osg::Group* createForest(TreeBin& forest, const osg::Matrix& transform);
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}
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#endif
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