squircle.h Example File

scenegraph/openglunderqml/squircle.h

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  #ifndef SQUIRCLE_H
  #define SQUIRCLE_H

  #include <QtQuick/QQuickItem>
  #include <QtGui/QOpenGLShaderProgram>
  #include <QtGui/QOpenGLFunctions>

  class SquircleRenderer : public QObject, protected QOpenGLFunctions
  {
      Q_OBJECT
  public:
      SquircleRenderer() : m_t(0), m_program(0) { }
      ~SquircleRenderer();

      void setT(qreal t) { m_t = t; }
      void setViewportSize(const QSize &size) { m_viewportSize = size; }
      void setWindow(QQuickWindow *window) { m_window = window; }

  public slots:
      void paint();

  private:
      QSize m_viewportSize;
      qreal m_t;
      QOpenGLShaderProgram *m_program;
      QQuickWindow *m_window;
  };

  class Squircle : public QQuickItem
  {
      Q_OBJECT
      Q_PROPERTY(qreal t READ t WRITE setT NOTIFY tChanged)

  public:
      Squircle();

      qreal t() const { return m_t; }
      void setT(qreal t);

  signals:
      void tChanged();

  public slots:
      void sync();
      void cleanup();

  private slots:
      void handleWindowChanged(QQuickWindow *win);

  private:
      qreal m_t;
      SquircleRenderer *m_renderer;
  };

  #endif // SQUIRCLE_H