VolumeRenderer.h

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#ifndef GlobeEngine_VolumeRenderer_h
#define GlobeEngine_VolumeRenderer_h

#include "OpenGL_Includes.h"
#include "Camera.h"
#include "Cube.h"
#include "VolumeComposition.h"
#include "SceneStateSet.h"
#include <vmmlib/vmmlib.hpp>

namespace geFlow {

    class VolumeRenderer
    {
    public:
        VolumeRenderer();
        ~VolumeRenderer();
        
        void clear();
        void create(std::string _shaderpath, vmml::Vector2d _viewport, vmml::Vector3d _scale, vmml::Vector3d _position);
        void draw(std::shared_ptr<ge::Camera> _cam);
        void updateCompositions(vmml::Vector2d _viewport
            , vmml::Vector2d _camViewport);

        const ge::FrameBufferObject& getVolumeBuffer() const;
        const ge::FrameBufferObject& getFrontFaceBuffer() const;
        const ge::FrameBufferObject& getBackFaceBuffer() const;

        void isEnabled(bool _in);
        bool isEnabled() const;

        void selectRayMarchingMethod(int _rayMarching);
        void setLMIP(float _lmipThreshold);
        void setStepSize(float _stepsize);
        void updateTextureSelection(int _directory, int _timestep);
        
        void setTransferFunctionTextureData(unsigned char* _tfdata);
        void updateTransferfunction();

        std::shared_ptr<geFlow::VolumeComposition> getVolumeComposition() const;
        GLuint getVolumeCompositionHandleForLayer(int _idx, int _timestep) const;
        int getVolumeCompositionSize() const;
        void setFramebufferStandardIDs(int _id);

    private:
        ge::SceneStateSet sceneState;
        
        std::shared_ptr<ge::Cube> volumeBoundCube;
        std::shared_ptr<ge::Shader> programForCubes;
        std::shared_ptr<ge::Shader> programForEmissionAbsorption;
        std::shared_ptr<ge::Shader> programForMaximumIntensityProjection;
        std::shared_ptr<ge::Shader> programForMean;
        std::shared_ptr<ge::Shader> programForFirstLocalMaximum;

        std::shared_ptr<geFlow::VolumeComposition> volumeComposition;
        
        std::shared_ptr<ge::Texture1Drgba> transferFunctionTexture;
        
        ge::FrameBufferObject frontFacesBuffer;
        ge::FrameBufferObject backFacesBuffer;
        ge::FrameBufferObject volumeBuffer;

        bool rayMarchingActive;
    };
}
#endif