GLRenderWidget.h

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#ifndef GL_RENDER_WIDGET_H
#define GL_RENDER_WIDGET_H

#include <QOpenGLWidget>
#include <QOpenGLFunctions>

#include <QOpenGLBuffer>
#include <QOpenGLVertexArrayObject>

#include <QOpenGLShader>
#include <QOpenGLTexture>

#include <QOpenGLDebugLogger>

#include "Renderable.h"
#include <QColor>

#include <memory>
#include <vector>

class GLRenderWidget : public QOpenGLWidget, protected QOpenGLFunctions
{

public:
    GLRenderWidget(QWidget *parent);
    ~GLRenderWidget();

    void setShader(const std::string& vert, const std::string& frag);

    void setRenderObject(RenderData& data);

    void setVolumeTexture(QOpenGLTexture* volume3Dtex);

    void setRegion(float sep, QColor c1, QColor c2);

    void setOrientation(int ori);

protected:
    QOpenGLShaderProgram* shader;
    RenderData objectData;

    QOpenGLVertexArrayObject vao;
    QOpenGLBuffer vbo;
    QOpenGLBuffer indices;

    void initializeGL();
    void resizeGL(int width, int height);

    void paintGL();

    QOpenGLDebugLogger* logger;

private:
    void updateVBOs();

    bool hasData;
    bool hasShader;
    bool hasRegionSeperatorValueAndColors;
    bool dirty;
    size_t numVerts;

    QOpenGLTexture* volume;

    // Transfer function parameters
    int orientation;
    float regionSeperator;
    QColor regionColor1;
    QColor regionColor2;

};

#endif