StelToastGrid.hpp

/*
 * Stellarium
 * Copyright (C) 2010 Guillaume Chereau
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifndef STELTOASTGRID_HPP
#define STELTOASTGRID_HPP

#include <QVector>
#include "VecMath.hpp"

inline int pow2(int x) {return 1 << x;}

class ToastGrid
{
public:
    ToastGrid(int maxLevel);
    QVector<Vec3d> getVertexArray(int level, int x, int y, int resolution) const;
    QVector<Vec2f> getTextureArray(int level, int x, int y, int resolution) const;
    QVector<unsigned short> getTrianglesIndex(int level, int x, int y, int resolution) const;
    QVector<Vec3d> getPolygon(int level, int x, int y) const;
    int getMaxLevel() const {return maxLevel;}

private:
    const Vec3d& at(int x, int y) const {return grid[y * size + x];}
    Vec3d& at(int x, int y) {return grid[y * size + x];}
    const Vec3d& at(int level, int x, int y) const
        {int scale = pow2(maxLevel - level); return at(scale * x, scale * y);}
    Vec3d& at(int level, int x, int y)
        {int scale = pow2(maxLevel - level); return at(scale * x, scale * y);}

    void init_grid();
    void init_grid(int level, int x, int y, bool side);

    int maxLevel;
    int size;
    QVector<Vec3d> grid;
};

#endif // STELTOASTGRID_HPP