main/include/LayeredClouds.h

/*
This file is part of Caelum.
See http://www.ogre3d.org/wiki/index.php/Caelum 

Copyright (c) 2006-2007 Caelum team. See Contributors.txt for details.

Caelum is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Caelum 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with Caelum. If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef LAYEREDCLOUDS_H
#define LAYEREDCLOUDS_H

#include "CaelumPrerequisites.h"
#include "CameraBoundElement.h"

namespace caelum {

class CAELUM_EXPORT LayeredClouds: public CameraBoundElement {
    public:
        LayeredClouds (
                Ogre::SceneManager* scene,
                Ogre::SceneNode *caelumRootNode,
                const Ogre::String &resourceGroupName="Caelum",
                const Ogre::String &materialName="CaelumLayeredClouds",
                const Ogre::String &meshName="CaelumLayeredClouds",
                const Ogre::String &entityName="CaelumLayeredClouds");

        ~LayeredClouds ();

        void update (
                Ogre::Real timePassed,
                const Ogre::Vector3& sunDirection,
                const Ogre::ColourValue& sunColour,
                const Ogre::ColourValue& fogColour);

        void setCloudCover (const Ogre::Real cloudCover);

        Ogre::Real getCloudCover () const;

        void setCloudCoverLookup (const Ogre::String& fileName);

        void disableCloudCoverLookup ();


        void setCloudMassBlend (const Ogre::Real cloudCover);

        Ogre::Real getCloudMassBlend () const;

        void setCloudMassOffset (const Ogre::Vector2 &cloudMassOffset);

        Ogre::Vector2 getCloudMassOffset () const;

        void setCloudDetailOffset (const Ogre::Vector2 &cloudMassOffset);

        Ogre::Vector2 getCloudDetailOffset () const;


        bool isAnimating () const;

        void setAnimating (bool animating);

        void setCloudSpeed (const Ogre::Vector2 &cloudSpeed);

        Ogre::Vector2 getCloudSpeed () const;

        void setCloudBlendTime (const Ogre::Real cloudBlendTime);

        Ogre::Real getCloudBlendTime () const;

    private:
        Ogre::GpuProgramParametersSharedPtr getFpParams();

        Ogre::GpuProgramParametersSharedPtr getVpParams();

        Ogre::TextureUnitState* getTUS(unsigned short num);
        
        void setSunDirection(const Ogre::Vector3 &sunDirection);

        void setSunColour(const Ogre::ColourValue &sunColour);

        void setFogColour(const Ogre::ColourValue &fogColour);

        void setInvHazeHeight (const Ogre::Real invHazeHeight);

        Ogre::Real mCloudCover;

        Ogre::Real mCloudMassBlend;

        Ogre::Vector2 mCloudMassOffset;

        Ogre::Vector2 mCloudDetailOffset;

        std::auto_ptr<Ogre::Image> mCloudCoverLookup;


        bool mAnimating;

        Ogre::Real mCloudBlendTime;

        bool mCloudBlendAnimationDirection;

        Ogre::Vector2 mCloudSpeed;


        Ogre::MaterialPtr mMaterial;

        bool mShadersEnabled;

        Ogre::SceneNode *mNode;

        Ogre::Entity *mEntity;

        Ogre::SceneManager *mSceneMgr;

    public:
        virtual void notifyCameraChanged (Ogre::Camera *cam);

    protected:
        virtual void setFarRadius (Ogre::Real radius);
};
}  // namespace caelum

#endif // LAYEREDCLOUDS_H

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