1 files changed, 154 insertions, 0 deletions
diff --git a/tests/manual/examples/opengl/qopenglwindow/main.cpp b/tests/manual/examples/opengl/qopenglwindow/main.cpp
new file mode 100644
index 0000000000..44810a4ecf
--- /dev/null
+++ b/tests/manual/examples/opengl/qopenglwindow/main.cpp
@@ -0,0 +1,154 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QOpenGLWindow>
+#include <QScreen>
+#include <QPainter>
+#include <QPainterPath>
+#include <QGuiApplication>
+#include <QMatrix4x4>
+#include <QStaticText>
+#include <QKeyEvent>
+
+#include "background_renderer.h"
+
+static QPainterPath painterPathForTriangle()
+{
+    static const QPointF bottomLeft(-1.0, -1.0);
+    static const QPointF top(0.0, 1.0);
+    static const QPointF bottomRight(1.0, -1.0);
+
+    QPainterPath path(bottomLeft);
+    path.lineTo(top);
+    path.lineTo(bottomRight);
+    path.closeSubpath();
+    return path;
+}
+
+class OpenGLWindow : public QOpenGLWindow
+{
+    Q_OBJECT
+
+public:
+    OpenGLWindow();
+
+protected:
+    void paintGL() override;
+    void resizeGL(int w, int h) override;
+    void keyPressEvent(QKeyEvent *e) override;
+
+private:
+    void setAnimating(bool enabled);
+
+    QMatrix4x4 m_window_normalised_matrix;
+    QMatrix4x4 m_window_painter_matrix;
+    QMatrix4x4 m_projection;
+    QMatrix4x4 m_view;
+    QMatrix4x4 m_model_triangle;
+    QMatrix4x4 m_model_text;
+
+    FragmentToy m_fragment_toy;
+    QStaticText m_text_layout;
+    bool m_animate;
+};
+
+// Use NoPartialUpdate. This means that all the rendering goes directly to
+// the window surface, no additional framebuffer object stands in the
+// middle. This is fine since we will clear the entire framebuffer on each
+// paint. Under the hood this means that the behavior is equivalent to the
+// manual makeCurrent - perform OpenGL calls - swapBuffers loop that is
+// typical in pure QWindow-based applications.
+OpenGLWindow::OpenGLWindow()
+    : QOpenGLWindow(QOpenGLWindow::NoPartialUpdate)
+    , m_fragment_toy("./background.frag")
+    , m_text_layout("The triangle and this text is rendered with QPainter")
+    , m_animate(true)
+{
+    setGeometry(300, 300, 500, 500);
+
+    m_view.lookAt(QVector3D(3,1,1),
+                  QVector3D(0,0,0),
+                  QVector3D(0,1,0));
+
+    setAnimating(m_animate);
+}
+
+void OpenGLWindow::paintGL()
+{
+    m_fragment_toy.draw(size());
+
+    QPainter p(this);
+    p.setWorldTransform(m_window_normalised_matrix.toTransform());
+
+    QMatrix4x4 mvp = m_projection * m_view * m_model_triangle;
+    p.setTransform(mvp.toTransform(), true);
+
+    p.fillPath(painterPathForTriangle(), QBrush(QGradient(QGradient::NightFade)));
+
+    QTransform text_transform = (m_window_painter_matrix * m_view * m_model_text).toTransform();
+    p.setTransform(text_transform, false);
+    p.setPen(QPen(Qt::black));
+    m_text_layout.prepare(text_transform);
+    qreal x = - (m_text_layout.size().width() / 2);
+    qreal y = 0;
+    p.drawStaticText(x, y, m_text_layout);
+
+    m_model_triangle.rotate(-1, 0, 1, 0);
+    m_model_text.rotate(1, 0, 1, 0);
+}
+
+void OpenGLWindow::resizeGL(int w, int h)
+{
+    m_window_normalised_matrix.setToIdentity();
+    m_window_normalised_matrix.translate(w / 2.0, h / 2.0);
+    m_window_normalised_matrix.scale(w / 2.0, -h / 2.0);
+
+    m_window_painter_matrix.setToIdentity();
+    m_window_painter_matrix.translate(w / 2.0, h / 2.0);
+
+    m_text_layout.setTextWidth(std::max(w * 0.2, 80.0));
+
+    m_projection.setToIdentity();
+    m_projection.perspective(45.f, qreal(w) / qreal(h), 0.1f, 100.f);
+}
+
+void OpenGLWindow::keyPressEvent(QKeyEvent *e)
+{
+    if (e->key() == Qt::Key_P) { // pause
+        m_animate = !m_animate;
+        setAnimating(m_animate);
+    }
+}
+
+void OpenGLWindow::setAnimating(bool enabled)
+{
+    if (enabled) {
+        // Animate continuously, throttled by the blocking swapBuffers() call the
+        // QOpenGLWindow internally executes after each paint. Once that is done
+        // (frameSwapped signal is emitted), we schedule a new update. This
+        // obviously assumes that the swap interval (see
+        // QSurfaceFormat::setSwapInterval()) is non-zero.
+        connect(this, &QOpenGLWindow::frameSwapped,
+                this, QOverload<>::of(&QPaintDeviceWindow::update));
+        update();
+    } else {
+        disconnect(this, &QOpenGLWindow::frameSwapped,
+                   this, QOverload<>::of(&QPaintDeviceWindow::update));
+    }
+}
+
+int main(int argc, char **argv)
+{
+    QGuiApplication app(argc, argv);
+
+    OpenGLWindow window;
+    QSurfaceFormat fmt;
+    fmt.setDepthBufferSize(24);
+    fmt.setStencilBufferSize(8);
+    window.setFormat(fmt);
+    window.show();
+
+    return app.exec();
+}
+
+#include "main.moc"