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Thread: How to render QGLWidget within QML

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  1. #1

    Default How to render QGLWidget within QML

    I am trying to show QGLWidget within QML. But somehow its not visible. Can someone point what might have gone wrong. The same glwidget works fine with Qt instead of QML. When the instance of glwidget is created within qml it calls the corresponding constructor but none of the gl call gets called.
    Can't I show a QGLWidget within QML ? If not how can i render opengl widgets within QML ?

    Here is a sample code which reproduces the issue. I am trying to render the GLWidget withing embed.qml

    glwidget.cpp :
    Qt Code:
    1. #include <QtWidgets>
    2. #include <QtOpenGL>
    3. #include "glwidget.h"
    4.  
    5. GLWidget::GLWidget(QWidget *parent)
    6. : QGLWidget(QGLFormat(QGL::SampleBuffers), parent)
    7. {
    8. qDebug() << __FUNCTION__;
    9. }
    10.  
    11. GLWidget::~GLWidget()
    12. {
    13. qDebug() << __FUNCTION__;
    14. }
    15.  
    16. QSize GLWidget::minimumSizeHint() const
    17. {
    18. qDebug() << __FUNCTION__;
    19. return QSize(50, 50);
    20. }
    21.  
    22. QSize GLWidget::sizeHint() const
    23. {
    24. qDebug() << __FUNCTION__;
    25. return QSize(700, 700);
    26. }
    27.  
    28. void GLWidget::initializeGL()
    29. {
    30. qDebug() << __FUNCTION__;
    31. glClearColor (0.0, 0.0, 0.0, 0.0);
    32. glShadeModel (GL_FLAT);
    33. }
    34.  
    35. void GLWidget::paintGL()
    36. {
    37. qDebug() << __FUNCTION__;
    38. glClear(GL_COLOR_BUFFER_BIT);
    39. glPushMatrix();
    40. glColor3f(0.0, 1.0, 0.0);
    41. glRectf(-25.0, -25.0, 25.0, 25.0);
    42. glPopMatrix();
    43. }
    44.  
    45. void GLWidget::resizeGL(int w, int h)
    46. {
    47. qDebug() << __FUNCTION__;
    48. glViewport (0, 0, (GLsizei) w, (GLsizei) h);
    49. glMatrixMode(GL_PROJECTION);
    50. glLoadIdentity();
    51. glOrtho(-50.0, 50.0, -50.0, 50.0, -1.0, 1.0);
    52. glMatrixMode(GL_MODELVIEW);
    53. glLoadIdentity();
    54. }
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    glwidget.h :
    Qt Code:
    1. #include <QGLWidget>
    2.  
    3. class GLWidget : public QGLWidget
    4. {
    5. Q_OBJECT
    6.  
    7. public:
    8. GLWidget(QWidget *parent = 0);
    9. ~GLWidget();
    10.  
    11. QSize minimumSizeHint() const;
    12. QSize sizeHint() const;
    13.  
    14. protected:
    15. void initializeGL();
    16. void paintGL();
    17. void resizeGL(int width, int height);
    18. };
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    main.cpp :
    Qt Code:
    1. #include <QApplication>
    2. #include <QDesktopWidget>
    3. #include <QtQml>
    4.  
    5. #include "qtquick2applicationviewer.h"
    6. #include "glwidget.h"
    7.  
    8. int main(int argc, char *argv[])
    9. {
    10. QApplication app(argc, argv);
    11.  
    12. qmlRegisterType<GLWidget>("com.opengl.display", 1, 0, "Opengl");
    13. QtQuick2ApplicationViewer viewer;
    14. viewer.setMainQmlFile(QStringLiteral("embed.qml"));
    15. viewer.showFullScreen();
    16.  
    17. return app.exec();
    18. }
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    embed.qml :
    Qt Code:
    1. import QtQuick 2.0
    2. import com.opengl.display 1.0
    3.  
    4. Item {
    5. id: screen; width: 1080; height: 720
    6. Rectangle {
    7. id: background
    8. anchors.fill: parent; color: "#343434";
    9. Opengl {
    10. id: openglwidget
    11. }
    12. }
    13. }
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  2. #2
    Join Date
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    Default Re: How to render QGLWidget within QML

    You cannot embed a widget into a QtQuick2 scene.

    If you want to render items in the scene with OpenGL, you can create a cusomt QQuickItem or use a QQuickFramebufferObject to render into that and have it displayed in the scene.

    Cheers,
    _

  3. #3

    Default Re: How to render QGLWidget within QML

    Thanks anda_skoa. I really appreciate for the pointers provided .
    Custom QQuickItem should solve what i am looking for.

  4. #4
    Join Date
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    Default Re: How to render QGLWidget within QML

    Quote Originally Posted by rannamal View Post
    Thanks anda_skoa. I really appreciate for the pointers provided .
    Custom QQuickItem should solve what i am looking for.
    Is there any good example how to transform QGLWidget to custom QQuickItem? Thanks!

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