cxShaderCallback.h

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/*=========================================================================
This file is part of CustusX, an Image Guided Therapy Application.
                 
Copyright (c) SINTEF Department of Medical Technology.
All rights reserved.
                 
CustusX is released under a BSD 3-Clause license.
                 
See Lisence.txt (https://github.com/SINTEFMedtek/CustusX/blob/master/License.txt) for details.
=========================================================================*/

#ifndef CXSINGLEVOLUMEPAINTERHELPER_H
#define CXSINGLEVOLUMEPAINTERHELPER_H

#include "cxResourceVisualizationExport.h"
#include "cxForwardDeclarations.h"
#include <vtkCommand.h>

#include "cxLogger.h"


class vtkOpenGLHelper;
class vtkShaderProgram;
class vtkOpenGLVertexArrayObject;

typedef vtkSmartPointer<class vtkTextureObject> vtkTextureObjectPtr;
typedef vtkSmartPointer<class vtkOpenGLBufferObject> vtkOpenGLBufferObjectPtr;

namespace cx
{
typedef vtkSmartPointer<class ShaderCallback> ShaderCallbackPtr;

class cxResourceVisualization_EXPORT ShaderCallback : public vtkCommand
{

public:
        struct ShaderItem
        {
                QString mTextureUid;
                vtkTextureObjectPtr mTexture;

                QString mTextureCoordinatesUid;
                vtkOpenGLBufferObjectPtr mTextureCoordinates;

                QString mLUTUid;
                vtkTextureObjectPtr mLUT;

                //int mLutSize; //basically: used to check if lut should be applied, also a check if it is RED or RGB(A)
                float mWindow;
                float mLevel;
                float mLLR; //low level reject
                float mAlpha;
        };
        typedef boost::shared_ptr<ShaderItem> ShaderItemPtr;

        static ShaderCallback *New();
        ShaderCallback();
        virtual ~ShaderCallback();

        virtual void Execute(vtkObject *, unsigned long eventId, void*cbo);

        ShaderItemPtr getShaderItem(QString image_uid) const;
        int getNumberOfUploadedTextures() const;

        void add(ShaderItemPtr item);
        void clearShaderItems();

private:
        static void addArrayToAttributeArray(vtkShaderProgram *program, vtkOpenGLBufferObjectPtr buffer, std::string name, int vector_index);
        static void addUniformiArray(vtkShaderProgram *program, std::string name, int value);
        static void addUniformfArray(vtkShaderProgram *program, std::string name, float value);
        static void bindFSOutputVariable(vtkShaderProgram *program);

        std::string getVectorNameFromName(std::string name, int index_of_vector) const;
        void printDebugInfo(vtkOpenGLHelper *OpenGLHelper);

        std::vector<ShaderItemPtr> mShaderItems;
};

}//cx

#endif // CXSINGLEVOLUMEPAINTERHELPER_H