init; working gl scene

.gitignore

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+*.pro.user
+*.o
+ui_*

TheGame/TheGame.pro

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+#-------------------------------------------------
+#
+# Project created by QtCreator 2016-08-31T15:17:33
+#
+#-------------------------------------------------
+
+QT       += core gui opengl
+
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+TARGET = TheGame
+TEMPLATE = app
+
+
+SOURCES += main.cpp\
+        mainwindow.cpp \
+    renderwidget.cpp
+
+HEADERS  += mainwindow.h \
+    renderwidget.h
+
+FORMS    += mainwindow.ui
+
+LIBS += -lGLU

TheGame/main.cpp

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+#include "mainwindow.h"
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    MainWindow w;
+    w.show();
+
+    return a.exec();
+}

TheGame/mainwindow.cpp

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+#include "mainwindow.h"
+#include "ui_mainwindow.h"
+
+MainWindow::MainWindow(QWidget *parent) :
+    QWidget(parent),
+    ui(new Ui::MainWindow)
+{
+    ui->setupUi(this);
+}
+
+MainWindow::~MainWindow()
+{
+    delete ui;
+}

TheGame/mainwindow.h

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+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QWidget>
+
+namespace Ui {
+class MainWindow;
+}
+
+class MainWindow : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit MainWindow(QWidget *parent = 0);
+    ~MainWindow();
+
+private:
+    Ui::MainWindow *ui;
+};
+
+#endif // MAINWINDOW_H

TheGame/mainwindow.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>MainWindow</class>
+ <widget class="QWidget" name="MainWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>400</width>
+    <height>300</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>MainWindow</string>
+  </property>
+  <layout class="QGridLayout" name="gridLayout">
+   <item row="0" column="0">
+    <widget class="RenderWidget" name="widget" native="true"/>
+   </item>
+  </layout>
+ </widget>
+ <layoutdefault spacing="6" margin="11"/>
+ <customwidgets>
+  <customwidget>
+   <class>RenderWidget</class>
+   <extends>QWidget</extends>
+   <header>renderwidget.h</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
+ <resources/>
+ <connections/>
+</ui>

TheGame/renderwidget.cpp

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+#include "renderwidget.h"
+#include <GL/glu.h>
+#include <QTimer>
+#include <math.h>
+
+RenderWidget::RenderWidget(QWidget *parent) :
+    QGLWidget(QGLFormat(QGL::SampleBuffers), parent)
+  , angle(0)
+  , _fov(70)
+{
+}
+
+void RenderWidget::initializeGL()
+{
+    makeCurrent();
+    qglClearColor(Qt::gray);
+
+    glEnable(GL_DEPTH_TEST);
+    glEnable(GL_CULL_FACE);
+    glShadeModel(GL_SMOOTH);
+    glEnable(GL_MULTISAMPLE);
+
+    glMatrixMode(GL_PROJECTION);
+    gluPerspective(_fov, width()/height(), 0.1, 100.0);
+    glMatrixMode(GL_MODELVIEW);
+    animate();
+}
+
+void RenderWidget::paintGL()
+{
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    glLoadIdentity();
+
+    float rad = (float)angle / 180.0 * M_PI;
+    float radius = 5.0f;
+
+    gluLookAt(radius * cos(rad), 5.0f, radius * sin(rad),
+               0.0f, 0.0f, 0.0f,
+               0.0f, 1.0f, 0.0f);
+
+    drawAxes();
+}
+
+void RenderWidget::resizeGL(int width, int height)
+{
+    int side = qMin(width, height);
+    glViewport((width - side) / 2, (height - side) / 2, side, side);
+}
+
+void RenderWidget::animate()
+{
+    angle = (angle + 3) % 360;
+    update();
+    QTimer::singleShot(50, this, SLOT(animate()));
+}
+
+void RenderWidget::drawAxes()
+{
+    glLineWidth(2.5);
+
+    glColor3f(1.0, 0.0, 0.0);
+    glBegin(GL_LINES);
+    glVertex3f(0.0, 0.0, 0.0);
+    glVertex3f(1.0, 0.0, 0.0);
+    glEnd();
+
+    glColor3f(0.0, 1.0, 0.0);
+    glBegin(GL_LINES);
+    glVertex3f(0.0, 0.0, 0.0);
+    glVertex3f(0.0, 1.0, 0.0);
+    glEnd();
+
+    glColor3f(0.0, 0.0, 1.0);
+    glBegin(GL_LINES);
+    glVertex3f(0.0, 0.0, 0.0);
+    glVertex3f(0.0, 0.0, 1.0);
+    glEnd();
+}

TheGame/renderwidget.h

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+#ifndef RENDERWIDGET_H
+#define RENDERWIDGET_H
+
+#include <QGLWidget>
+
+class RenderWidget : public QGLWidget
+{
+    Q_OBJECT
+public:
+    explicit RenderWidget(QWidget *parent = 0);
+
+protected:
+    void initializeGL();
+    void paintGL();
+    void resizeGL(int width, int height);
+
+signals:
+
+public slots:
+    void animate();
+
+    void drawAxes();
+
+private:
+    int angle;
+
+    float _fov;
+
+};
+
+#endif // RENDERWIDGET_H

UGameEngine.pro

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+TEMPLATE = subdirs
+
+SUBDIRS += \
+    TheGame