First triangle drawn in Qt Project

MeshViewerQt/Form Files/MainWindow.ui

-<UI version="4.0" >
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
  <class>MainWindowClass</class>
- <widget class="QMainWindow" name="MainWindowClass" >
-  <property name="objectName" >
-   <string notr="true">MainWindowClass</string>
-  </property>
-  <property name="geometry" >
+ <widget class="QMainWindow" name="MainWindowClass">
+  <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
@@ -12,18 +10,26 @@
     <height>400</height>
    </rect>
   </property>
-  <property name="windowTitle" >
+  <property name="windowTitle">
    <string>MainWindow</string>
   </property>
-  <widget class="QMenuBar" name="menuBar" />
-  <widget class="QToolBar" name="mainToolBar" />
-  <widget class="QWidget" name="centralWidget" />
-  <widget class="QStatusBar" name="statusBar" />
+  <widget class="QWidget" name="centralWidget"/>
+  <widget class="QToolBar" name="mainToolBar">
+   <property name="movable">
+    <bool>false</bool>
+   </property>
+   <attribute name="toolBarArea">
+    <enum>TopToolBarArea</enum>
+   </attribute>
+   <attribute name="toolBarBreak">
+    <bool>false</bool>
+   </attribute>
+  </widget>
+  <widget class="QStatusBar" name="statusBar"/>
  </widget>
- <layoutDefault spacing="6" margin="11" />
- <pixmapfunction></pixmapfunction>
+ <layoutdefault spacing="6" margin="11"/>
  <resources>
-   <include location="MainWindow.qrc"/>
+  <include location="../Resources/MainWindow.qrc"/>
  </resources>
  <connections/>
-</UI>
+</ui>

MeshViewerQt/Header/MainWindow.h

@@ -11,11 +11,21 @@ public:
 	MainWindow(QWidget *parent = Q_NULLPTR);
 	~MainWindow();
 
+// Variables
 private:
 	Ui::MainWindowClass* ui;
 
+// Functions
+private:
 	void setupWindow();
 
+// Slots
+private slots:
+	void openFile();
+	void aboutFile();
+	
+
+// Override Functions
 protected:
 	virtual void keyPressEvent(QKeyEvent * keyEvent) override final;
 };

MeshViewerQt/Header/OpenGlViewer.h

@@ -2,6 +2,9 @@
 
 #include <QOpenGLWidget>
 #include <QOpenGLFunctions>
+#include <QOpenGLBuffer>
+#include <QOPenGLVertexArrayObject>
+#include <QOpenGlShaderProgram>
 
 class OpenGlViewer : public QOpenGLWidget, protected QOpenGLFunctions
 {
@@ -11,8 +14,18 @@ public:
 	OpenGlViewer(QWidget *parent);
 	~OpenGlViewer();
 
+private:
+	QOpenGLBuffer mVertexBuffer;
+	QOpenGLVertexArrayObject mVertexArray;
+	QOpenGLShaderProgram* mProgram = nullptr;
+
+private:
+	void printContextInformation();
+
 protected:
 	virtual void initializeGL() override final;
 	virtual void resizeGL(int w, int h) override final;
 	virtual void paintGL() override final;
+
+public:
 };

MeshViewerQt/Header/Vertex.h

+#ifndef VERTEX_H
+#define VERTEX_H
+
+#include <QVector3D>
+
+class Vertex
+{
+public:
+	// Constructors
+	Q_DECL_CONSTEXPR Vertex();
+	Q_DECL_CONSTEXPR explicit Vertex(const QVector3D &position);
+	Q_DECL_CONSTEXPR Vertex(const QVector3D &position, const QVector3D &color);
+
+	// Accessors / Mutators
+	Q_DECL_CONSTEXPR const QVector3D& position() const;
+	Q_DECL_CONSTEXPR const QVector3D& color() const;
+	void setPosition(const QVector3D& position);
+	void setColor(const QVector3D& color);
+
+	// OpenGL Helpers
+	static const int PositionTupleSize = 3;
+	static const int ColorTupleSize = 3;
+	static Q_DECL_CONSTEXPR int positionOffset();
+	static Q_DECL_CONSTEXPR int colorOffset();
+	static Q_DECL_CONSTEXPR int stride();
+
+private:
+	QVector3D m_position;
+	QVector3D m_color;
+};
+
+/*******************************************************************************
+* Inline Implementation
+******************************************************************************/
+
+// Note: Q_MOVABLE_TYPE means it can be memcpy'd.
+Q_DECLARE_TYPEINFO(Vertex, Q_MOVABLE_TYPE);
+
+// Constructors
+Q_DECL_CONSTEXPR inline Vertex::Vertex() {}
+Q_DECL_CONSTEXPR inline Vertex::Vertex(const QVector3D &position) : m_position(position) {}
+Q_DECL_CONSTEXPR inline Vertex::Vertex(const QVector3D &position, const QVector3D &color) : m_position(position), m_color(color) {}
+
+// Accessors / Mutators
+Q_DECL_CONSTEXPR inline const QVector3D& Vertex::position() const { return m_position; }
+Q_DECL_CONSTEXPR inline const QVector3D& Vertex::color() const { return m_color; }
+void inline Vertex::setPosition(const QVector3D& position) { m_position = position; }
+void inline Vertex::setColor(const QVector3D& color) { m_color = color; }
+
+// OpenGL Helpers
+Q_DECL_CONSTEXPR inline int Vertex::positionOffset() { return offsetof(Vertex, m_position); }
+Q_DECL_CONSTEXPR inline int Vertex::colorOffset() { return offsetof(Vertex, m_color); }
+Q_DECL_CONSTEXPR inline int Vertex::stride() { return sizeof(Vertex); }
+
+#endif // VERTEX_H
\ No newline at end of file

MeshViewerQt/Resources/MainWindow.qrc

@@ -2,4 +2,8 @@
     <qresource prefix="/MainWindow">
         <file>icon.ico</file>
     </qresource>
+    <qresource prefix="/shaders">
+        <file>simple.frag</file>
+        <file>simple.vert</file>
+    </qresource>
 </RCC>

MeshViewerQt/Resources/simple.frag

+#version 330
+in vec4 vColor;
+out vec4 fColor;
+
+void main()
+{
+	fColor = vColor;
+}
\ No newline at end of file

MeshViewerQt/Resources/simple.vert

+#version 330
+layout(location = 0) in vec3 position;
+layout(location = 1) in vec3 color;
+out vec4 vColor;
+
+void main()
+{
+	gl_Position = vec4(position, 1.0);
+	vColor = vec4(color, 1.0);
+}
\ No newline at end of file

MeshViewerQt/Source/MainWindow.cpp

@@ -2,8 +2,12 @@
 #include "OpenGlViewer.h"
 #include "defines.h"
 #include <QKeyEvent>
+#include <QMessageBox>
 
 
+/////////////////////////////////////////////////////////////////////////
+// constructor/destructor
+
 MainWindow::MainWindow(QWidget *parent)
 	: QMainWindow(parent)
 	, ui (new Ui::MainWindowClass)
@@ -16,6 +20,10 @@ MainWindow::~MainWindow()
 	delete ui;
 }
 
+
+/////////////////////////////////////////////////////////////////////////
+// private functions
+
 void MainWindow::setupWindow()
 {
 	ui->setupUi(this);
@@ -26,11 +34,32 @@ void MainWindow::setupWindow()
 
 	this->setCentralWidget(new OpenGlViewer(this));
 
+	ui->mainToolBar->addAction("File Info", this, &MainWindow::aboutFile);
+
 	ui->statusBar->showMessage(DEFAULT_STATUS_MESSAGE);
+}
+
 
+/////////////////////////////////////////////////////////////////////////
+// private slots
 
+void MainWindow::openFile()
+{
+	//TODO: Open file
+}
+
+void MainWindow::aboutFile()
+{
+	//TODO: Open Window with file information
+	QMessageBox* dialog = new QMessageBox(QMessageBox::Information, WINDOW_NAME, "File Info", QMessageBox::StandardButton::Close, this, Qt::Dialog | Qt::MSWindowsFixedSizeDialogHint);
+	dialog->setDetailedText("This is the cool detailed text\n");
+	dialog->exec();
 }
 
+
+/////////////////////////////////////////////////////////////////////////
+// events
+
 void MainWindow::keyPressEvent(QKeyEvent * keyEvent)
 {
 	switch (keyEvent->key())

MeshViewerQt/Source/OpenGlViewer.cpp

 #include "OpenGlViewer.h"
 #include "defines.h"
+#include "Vertex.h"
+
+#include <iostream>
+
+static const Vertex sg_vertexes[] = {
+	Vertex(QVector3D(0.00f,  0.75f, 1.0f), QVector3D(1.0f, 0.0f, 0.0f)),
+	Vertex(QVector3D(0.75f, -0.75f, 1.0f), QVector3D(0.0f, 1.0f, 0.0f)),
+	Vertex(QVector3D(-0.75f, -0.75f, 1.0f), QVector3D(0.0f, 0.0f, 1.0f))
+};
 
 OpenGlViewer::OpenGlViewer(QWidget *parent)
 	: QOpenGLWidget(parent)
 {
 	QSurfaceFormat format;
+	format.setRenderableType(QSurfaceFormat::OpenGL);
+	format.setProfile(QSurfaceFormat::CompatibilityProfile);
 	format.setVersion(DEFAULT_MAJOR_VERSION, DEFAULT_MINOR_VERSION);
-	format.setProfile(QSurfaceFormat::CoreProfile);
-	this->setFormat(format);
 
+	setFormat(format);
 }
 
 OpenGlViewer::~OpenGlViewer()
 {
+	mVertexArray.destroy();
+	mVertexBuffer.destroy();
+	delete mProgram;
+}
+
+void OpenGlViewer::printContextInformation()
+{
+	QString glType;
+	QString glVersion;
+	QString glProfile;
+
+	glType = (context()->isOpenGLES()) ? "OpenGL ES" : "OpenGL";
+	glVersion = reinterpret_cast<const char*>(glGetString(GL_VERSION));
+
+#define CASE(c) case QSurfaceFormat::c: glProfile = #c; break
+	switch (format().profile())
+	{
+		CASE(NoProfile);
+		CASE(CoreProfile);
+		CASE(CompatibilityProfile);
+	}
+#undef CASE
+
+	std::cout << glType.toStdString() << " - " << glVersion.toStdString() << " (" << glProfile.toStdString() << ")";
 }
 
 void OpenGlViewer::initializeGL()
 {
 	initializeOpenGLFunctions();
+	printContextInformation();
 
+	//glEnable(GL_DEPTH_TEST);
 	glClearColor(DEAFAULT_BACKGROUND);
+
+	mProgram = new QOpenGLShaderProgram();
+	mProgram->addShaderFromSourceFile(QOpenGLShader::Vertex, ":/shaders/simple.vert");
+	mProgram->addShaderFromSourceFile(QOpenGLShader::Fragment, ":/shaders/simple.frag");
+	mProgram->link();
+	mProgram->bind();
+
+	mVertexBuffer.create();
+	mVertexBuffer.bind();
+	mVertexBuffer.setUsagePattern(QOpenGLBuffer::StaticDraw);
+	mVertexBuffer.allocate(sg_vertexes, sizeof(sg_vertexes));
+
+	mVertexArray.create();
+	mVertexArray.bind();
+	mProgram->enableAttributeArray(0);
+	mProgram->enableAttributeArray(1);
+	mProgram->setAttributeBuffer(0, GL_FLOAT, Vertex::positionOffset(), Vertex::PositionTupleSize, Vertex::stride());
+	mProgram->setAttributeBuffer(1, GL_FLOAT, Vertex::colorOffset(), Vertex::ColorTupleSize, Vertex::stride());
+
+	mVertexArray.release();
+	mVertexBuffer.release();
+	mProgram->release();
+
 }
 
 void OpenGlViewer::resizeGL(int w, int h)
@@ -30,5 +89,12 @@ void OpenGlViewer::resizeGL(int w, int h)
 void OpenGlViewer::paintGL()
 {
 	//TODO: paint here
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	mProgram->bind();
+	mVertexArray.bind();
+	glDrawArrays(GL_TRIANGLES, 0, sizeof(sg_vertexes) / sizeof(sg_vertexes[0]));
+	mVertexArray.release();
+	mProgram->release();
 }