OpenGLColorgradientWidget.h

#pragma once

#include <GL/glew.h>
#include <QWidget>
#include <QGLWidget>
//#include <QtOpenGL>
#include <QGLContext>
#include <QGLFormat>

#include "GLM/glm.hpp"
#include "Shader.h"
#include "TransferFunctionWidget.h"

class OpenGLColorgradientWidget : public QGLWidget
{
        Q_OBJECT

public:
        OpenGLColorgradientWidget(QWidget* parent = 0);
        ~OpenGLColorgradientWidget();

public slots:
        void generateTransferTexture(float* rgbaValues, int textureSize, int type);
        void resetTransferTexture();

        void setMode(int mode);

protected:
        void initializeGL();
        void resizeGL(int width,int height);
        void paintGL();

private:
        GLuint textureHandle;
        Shader* shader;
        glm::mat4 projectionMatrix;
        int screenWidth;
        int screenHeight;
        glm::vec4* vertices;
        bool textureLoaded;
        void calculateVertexCoord();
        void checkGLError();

        GLuint textureParticleHandle;
        int m_mode;
};