StelViewportEffect.hpp

/*
 * Stellarium
 * Copyright (C) 2010 Fabien 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., 51 Franklin Street, Suite 500, Boston, MA  02110-1335, USA.
 */

#ifndef _STELVIEWPORTEFFECT_HPP_
#define _STELVIEWPORTEFFECT_HPP_

#include "VecMath.hpp"
#include "StelProjector.hpp"

class QOpenGLFramebufferObject;

class StelViewportEffect
{
public:
    StelViewportEffect() {;}
    virtual ~StelViewportEffect() {;}
    virtual QString getName() {return "framebufferOnly";}
    virtual void alterBuffer(QOpenGLFramebufferObject*) const {;}
    virtual void paintViewportBuffer(const QOpenGLFramebufferObject* buf) const;
    virtual void distortXY(float& x, float& y) const {Q_UNUSED(x); Q_UNUSED(y);}
};


class StelViewportDistorterFisheyeToSphericMirror : public StelViewportEffect
{
public:
    StelViewportDistorterFisheyeToSphericMirror(int screen_w,int screen_h);
    ~StelViewportDistorterFisheyeToSphericMirror();
    virtual QString getName() {return "sphericMirrorDistorter";}
    virtual void paintViewportBuffer(const QOpenGLFramebufferObject* buf) const;
    virtual void distortXY(float& x, float& y) const;
private:
    const int screen_w;
    const int screen_h;
    const StelProjector::StelProjectorParams originalProjectorParams;
    StelProjector::StelProjectorParams newProjectorParams;
    int viewport_texture_offset[2];

    Vec2f *texture_point_array;
    int max_x,max_y;
    double step_x,step_y;

    QVector<Vec2f> displayVertexList;
    QVector<Vec4f> displayColorList;
    QVector<Vec2f> displayTexCoordList;
};

#endif // _STELVIEWPORTEFFECT_HPP_