LensFlare.h

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 /*
 *   ORXONOX - the hottest 3D action shooter ever to exist
 *                    > www.orxonox.net <
 *
 *
 *   License notice:
 *
 *   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, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 *   Author:
 *      David 'davidsa' Salvisberg
 *   Co-authors:
 *      ...
 *
 */

#ifndef _LensFlare_H__
#define _LensFlare_H__

#include "OrxonoxPrereqs.h"

#include "OgreBillboardSet.h"

#include "core/GraphicsManager.h"
#include "util/Math.h"
#include "tools/interfaces/Tickable.h"
#include "worldentities/StaticEntity.h"
#include "graphics/Billboard.h"

namespace orxonox
{    
    //TODO: The Hardware Occlusion only works properly for a single Flare on the screen,
    // if we have multiple strong lights it'll become way more complicated to determine how much of every object is occluded individually
    // there's below a 100 render queue groups, so maybe we should take turns for each object to be tested, so we only have one of the objects rendered at a time
    // obviously we shouldn't use too many of these effects anyways, since they use a lot of processing power, so not sure whether it's worth implementing a solution that works for multiple lens flares on screen 
    class _OrxonoxExport LensFlare : public StaticEntity, public Tickable
    {
          class Lens
          {
              public:
                  std::string material_;
                  float alpha_;
                  float scale_;
                  float position_;
                  Lens (const std::string& material, float alpha, float scale, float position)
                  {
                      this->material_ = material;
                      this->alpha_ = alpha;
                      this->scale_ = scale;
                      this->position_ = position;
                  }
          };
          
        public:
            LensFlare(Context* context);
            virtual ~LensFlare();
            
            inline void setScale(float scale)
                { this->scale_ = scale; }
            inline float getScale() const
                { return this->scale_; }
                
            inline void setColour(const ColourValue& colour)
                { this->colour_ = colour; }
            inline const ColourValue& getColour() const
                { return this->colour_; }
                
            inline void setFadeResolution(unsigned int fadeResolution)
                { this->fadeResolution_ = fadeResolution > 0 ? fadeResolution : 1; }
            inline unsigned int getFadeResolution() const
                { return this->fadeResolution_; }
                
            inline void setFadeExponent(float exponent)
                { this->fadeExponent_ = exponent; }
            inline float getFadeExponent() const
                { return this->fadeExponent_; }
                
            inline void setFadeOnViewBorder(bool fadeOnViewBorder)
                { this->fadeOnViewBorder_ = fadeOnViewBorder; }
            inline bool isFadeOnViewBorder() const
                { return this->fadeOnViewBorder_; }

            virtual void XMLPort(Element& xmlelement, XMLPort::Mode mode) override;

            virtual void tick(float dt) override;

            virtual void changedVisibility() override;

        private:
            void registerVariables();
            
            void createBillboards();
            
            void updateBillboardStates(const Vector3& viewDirection, float dimension, bool isLightVisible);
            
            void updateBillboardAlphas(float alpha);
            
            unsigned int getPointCount(float dimension) const;
            
            std::vector<Lens> lensConfiguration_;
            Billboard* occlusionBillboard_;
            std::vector<Billboard*> billboards_; 

            float scale_;
            bool fadeOnViewBorder_;
            unsigned int fadeResolution_;
            float fadeExponent_;
            ColourValue colour_;
    };
}

#endif /* _LensFlare_H__ */