GLWidget.h

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/****************************************************************************
**     Peter Beben: heavily modified this file for the purpose of
**     this project.
****************************************************************************/

#ifndef GLWIDGET_H
#define GLWIDGET_H

#include "Mesh.h"
#include "MeshWorker.h"
//#include "MessageLogger.h"

#include <QOpenGLWidget>
//#include <QOpenGLFunctions>
#include <QOpenGLExtraFunctions>
#include <QOpenGLVertexArrayObject>
#include <QOpenGLBuffer>
#include <QMatrix4x4>
#include <QRecursiveMutex>

class MessageLogger;
class MeshWorker;

QT_BEGIN_NAMESPACE
class QThread;
QT_END_NAMESPACE

QT_FORWARD_DECLARE_CLASS(QOpenGLShaderProgram)

class GLWidget : public QOpenGLWidget, protected QOpenGLExtraFunctions
{
    Q_OBJECT

	typedef void* MeshPtr;

public:
	GLWidget(QWidget *parent = nullptr, MessageLogger *msgLogger = nullptr);
	~GLWidget();

	static bool isTransparent() { return m_transparent; }
	static void setTransparent(bool t) { m_transparent = t; }

	QSize minimumSizeHint() const override;
	QSize sizeHint() const override;

public slots:
	void setVectRotation(int angle, QVector3D v);
	void setVectTranslation(QVector3D v);
	void cleanup();
	void setMesh(MeshPtr mesh);
	void setRandomMesh(size_t ndim);
	void getMesh(MeshPtr& mesh);
	void viewGLMeshNorms(bool enabled);
	void approxMeshNorms()
	{ emit meshApproxNorms(); }
	void noiseMesh(int nSweeps)
	{ emit meshNoise(nSweeps); }
	void smoothMesh(int nSweeps)
	{ emit meshSmooth(nSweeps); }
	void setNormScale(float scale) { setGLMeshNorms(scale*m_modelSize); }
	void updateMesh(int opt=0);

signals:
	void vectRotationChanged(int angle, QVector3D v);
	void vectTranslationChanged(QVector3D v);
	void meshGenerate(QVector3D norm, size_t ndim,
					  const std::function<float(float xu, float xv)> heightFun);
	void meshApproxNorms();
	void meshNoise(int nSweeps);
	void meshSmooth(int nSweeps);
	void logMessage(const QString& text);

protected:
	void initializeGL() override;
	void paintGL() override;
	void resizeGL(int width, int height) override;
	void mousePressEvent(QMouseEvent *event) override;
	void mouseMoveEvent(QMouseEvent *event) override;
	void wheelEvent(QWheelEvent *event) override;

private:
	void setupVertexAttribs(QOpenGLBuffer vbo);
	void setGLView();
	void setGLMesh();
	void setGLMeshNorms(float scale);
	void setGLMeshDebug();
	float frobeniusNorm4x4(QMatrix4x4 M);

	int m_vRot;
	QPoint m_lastMousePos;
	//QPoint m_lastWheelPos;
	Mesh m_mesh;
	float m_aspectRatio;
	float m_nearPlane;
	float m_farPlane;
	float m_modelSize;
	static constexpr int m_alignMatCol = 4*sizeof(float);
	static constexpr int m_alignSizMat33 = 3*m_alignMatCol;
	static constexpr int m_alignSizMat44 = 4*m_alignMatCol;
	static constexpr int m_projMatLoc = 0;
	static constexpr int m_projMatSiz = m_alignSizMat44;
	static constexpr int m_movMatLoc = m_projMatLoc + m_projMatSiz;
	static constexpr int m_movMatSiz = m_alignSizMat44;
	static constexpr int m_normMatLoc = m_movMatLoc + m_movMatSiz;
	static constexpr int m_normMatSiz = m_alignSizMat33;
	static constexpr size_t m_matUboSize = 2*m_alignSizMat44 + m_alignSizMat33;
	static constexpr int m_lightPosLoc = 0;
	static constexpr int m_lightPosSiz = 4*sizeof(float);
	static constexpr int m_colorLoc = m_lightPosLoc + m_lightPosSiz;
	static constexpr int m_colorSiz = 4*sizeof(float);
	static constexpr size_t m_lightUboSize = 8*sizeof(float);
	float m_normScale;
	bool m_showMeshNorms;
	QMatrix4x4 m_proj;
	QMatrix4x4 m_camera;
	QMatrix4x4 m_world;
	QVector3D m_rotVect;
	QVector3D m_movVect;
	QOpenGLVertexArrayObject m_meshVao;
	QOpenGLVertexArrayObject m_meshNormsVao;
	QOpenGLVertexArrayObject m_meshDebugVao;
	QOpenGLBuffer m_meshVbo;
	QOpenGLBuffer m_meshEbo;
	unsigned int m_matricesUbo;
	unsigned int m_lightsUbo;
	QOpenGLBuffer m_meshNormsVbo;
	QOpenGLBuffer m_meshDebugVbo;
	QOpenGLShaderProgram *m_shader;
	QOpenGLShaderProgram *m_shaderWireframe;
	static bool m_transparent;
	MessageLogger* m_msgLogger;
	QThread* m_meshThread;
	MeshWorker* m_meshWorker;
	QRecursiveMutex m_recMutex;

};

#endif