cloud.hxx

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// Written by Curtis Olson, started June 2000.
//
// Copyright (C) 2000  Curtis L. Olson  - http://www.flightgear.org/~curt
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Library 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, Fifth Floor, Boston, MA  02110-1301, USA.
//
// $Id: cloud_8hxx_source.html,v 1.3 2010/02/23 22:10:12 curt Exp $


#ifndef _SG_CLOUD_HXX_
#define _SG_CLOUD_HXX_

#include <simgear/compiler.h>
#include <simgear/misc/sg_path.hxx>
#include <simgear/math/SGMath.hxx>
#include <simgear/structure/SGReferenced.hxx>

#include <string>
using std::string;

#include <osg/ref_ptr>
#include <osg/Array>
#include <osg/Geode>
#include <osg/Group>
#include <osg/MatrixTransform>
#include <osg/Switch>

class SGCloudField;

class SGCloudLayer : public SGReferenced {
public:

    enum Coverage {
        SG_CLOUD_OVERCAST = 0,
        SG_CLOUD_BROKEN,
        SG_CLOUD_SCATTERED,
        SG_CLOUD_FEW,
        SG_CLOUD_CIRRUS,
        SG_CLOUD_CLEAR,
        SG_MAX_CLOUD_COVERAGES
    };

    SGCloudLayer( const string &tex_path );

    ~SGCloudLayer( void );

    float getSpan_m () const;
    void setSpan_m (float span_m);

    float getElevation_m () const;
    void setElevation_m (float elevation_m, bool set_span = true);

    float getThickness_m () const;
    void setThickness_m (float thickness_m);

    float getTransition_m () const;

    void setTransition_m (float transition_m);

    Coverage getCoverage () const;

    void setCoverage (Coverage coverage);

    inline void setDirection(float dir) { 
        // cout << "cloud dir = " << dir << endl;
        direction = dir;
    }

    inline float getDirection() { return direction; }

    inline void setSpeed(float sp) {
        // cout << "cloud speed = " << sp << endl;
        speed = sp;
    }

    inline float getSpeed() { return speed; }

    inline void setAlpha( float alpha ) {
        if ( alpha < 0.0 ) { alpha = 0.0; }
        if ( alpha > 1.0 ) { alpha = 1.0; }
        cloud_alpha = alpha;
    }

    void rebuild();

    void set_enable3dClouds(bool enable);

    bool repaint( const SGVec3f& fog_color );

    bool reposition( const SGVec3f& p, const SGVec3f& up,
                     double lon, double lat, double alt,
                     double dt = 0.0 );

    osg::Switch* getNode() { return cloud_root.get(); }

    static bool enable_bump_mapping;

    SGCloudField *get_layer3D(void) { return layer3D; }

protected:
    void setTextureOffset(const osg::Vec2& offset);
private:

    osg::ref_ptr<osg::Switch> cloud_root;
    osg::ref_ptr<osg::Switch> layer_root;
    osg::ref_ptr<osg::Group> group_top, group_bottom;
    osg::ref_ptr<osg::MatrixTransform> layer_transform;
    osg::ref_ptr<osg::Geode> layer[4];

    float cloud_alpha;          // 1.0 = drawn fully, 0.0 faded out completely

    osg::ref_ptr<osg::Vec4Array> cl[4];
    osg::ref_ptr<osg::Vec3Array> vl[4];
    osg::ref_ptr<osg::Vec2Array> tl[4];
    osg::ref_ptr<osg::Vec3Array> tl2[4];

    // height above sea level (meters)
    SGPath texture_path;
    float layer_span;
    float layer_asl;
    float layer_thickness;
    float layer_transition;
    Coverage layer_coverage;
    float scale;
    float speed;
    float direction;

    // for handling texture coordinates to simulate cloud movement
    // from winds, and to simulate the clouds being tied to ground
    // position, not view position
    // double xoff, yoff;
    double last_lon, last_lat, last_course;

    osg::Vec2 base;

    SGCloudField *layer3D;

};

#endif // _SG_CLOUD_HXX_

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