qt-everywhere-src-5.15.1/qtdeclarative/examples/quick/scenegraph/openglunderqml/squircle.h

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#ifndef SQUIRCLE_H
#define SQUIRCLE_H

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



//! [1]
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 init();
    void paint();

private:
    QSize m_viewportSize;
    qreal m_t;
    QOpenGLShaderProgram *m_program;
    QQuickWindow *m_window;
};
//! [1]

//! [2]
class Squircle : public QQuickItem
{
    Q_OBJECT
    Q_PROPERTY(qreal t READ t WRITE setT NOTIFY tChanged)
    QML_ELEMENT

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:
    void releaseResources() override;

    qreal m_t;
    SquircleRenderer *m_renderer;
};
//! [2]

#endif // SQUIRCLE_H