Why is it impossible to use Opengl in Qt 5?

Question

Probably, Opengl is the only thing I can’t use in Qt, maya and 3ds and other Autodesk programs use opengl in Qt, but no tutorial or example that works.

I already created a class for the widget based on Qopenglwidget (Since Qglwidget is obsolete), then in the Ui editor I add a widget and promote the class I created.

Result, when I compile a white screen with no menus or anything with the frozen screen, then the application crasha.

Several tutorials do this way and it works, but with me always gives the same result, the application crasha.

https://www.youtube.com/watch?v=A-PRoXR_62Q https://www.youtube.com/watch?v=1nzHSkY4K18

They all work in video, except in practice.

glpanel code. h

#include <QtOpenGL>

class GLPanel : public QOpenGLWidget, protected QOpenGLFunctions{

    Q_OBJECT

public:

    explicit GLPanel(QWidget *parent = 0);

protected:

    void initializeGL() Q_DECL_OVERRIDE;
    void resizeGL(int w, int h) Q_DECL_OVERRIDE;
    void paintGL() Q_DECL_OVERRIDE;

};

glpanel code.cpp

#include "glpanel.h"

GLPanel::GLPanel(QWidget *parent) :
    QOpenGLWidget(parent)
{

}

void GLPanel::initializeGL()
{
    initializeOpenGLFunctions();
}

void GLPanel::resizeGL(int w, int h)
{

}

void GLPanel::paintGL()
{

}

ui code

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>400</width>
    <height>400</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Ives 3D</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <layout class="QGridLayout" name="gridLayout_2">
    <item row="0" column="0">
     <widget class="GLPanel" name="Viewport" native="true"/>
    </item>
   </layout>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>400</width>
     <height>21</height>
    </rect>
   </property>
   <widget class="QMenu" name="menuFile">
    <property name="title">
     <string>File</string>
    </property>
    <addaction name="action_Exit"/>
   </widget>
   <addaction name="menuFile"/>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
  <widget class="QToolBar" name="toolBar">
   <property name="windowTitle">
    <string>toolBar</string>
   </property>
   <attribute name="toolBarArea">
    <enum>TopToolBarArea</enum>
   </attribute>
   <attribute name="toolBarBreak">
    <bool>false</bool>
   </attribute>
  </widget>
  <action name="action_Exit">
   <property name="text">
    <string>&amp;Exit</string>
   </property>
  </action>
 </widget>
 <customwidgets>
  <customwidget>
   <class>GLPanel</class>
   <extends>QWidget</extends>
   <header>glpanel.h</header>
   <container>1</container>
  </customwidget>
 </customwidgets>
 <resources/>
 <connections/>
</ui>

Someone can give me a light ?!!

Answer 1

Regarding the comment of the paulocanedo version of openGL that he posted is using shaders, this version is the latest. The advantages are the rendering speed and quality. The downside is the complexity and the need for a compatible graphics card.

Your project ran right here on Ubuntu. I made some modifications to your project and added the glut library to have an example on the screen. Link this in the description also (https://www.4shared.com/s/fS3cXWpknei). As for your error it may be the lack of an installed video drive or something related to the lack of opengl library. If your project continues to fail, try taking the initializeOpenGLFunctions(). Here I used QT 5.5.1 to compile.