A minimal c++-based compositor

No input handling.

Change-Id: Ie35f8ad5ff7317c83b9b76bc5c45adaca8bdb6fb
Reviewed-by: Laszlo Agocs <laszlo.agocs@theqtcompany.com>

1 files changed, 102 insertions, 0 deletions

diff --git a/examples/wayland/minimal-cpp/window.cpp b/examples/wayland/minimal-cpp/window.cpp
new file mode 100644
index 000000000..25ea6b64f
--- /dev/null
+++ b/examples/wayland/minimal-cpp/window.cpp
@@ -0,0 +1,102 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Wayland module
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "window.h"
+#include "compositor.h"
+
+#include <QPainter>
+#include <QMatrix4x4>
+#include <QOpenGLFunctions>
+
+Window::Window()
+    : m_compositor(0)
+{
+}
+
+void Window::setCompositor(Compositor *comp) {
+    m_compositor = comp;
+}
+
+void Window::initializeGL()
+{
+    m_textureBlitter.create();
+}
+
+static int sillyrandom(int range)
+{
+    if (range <= 0)
+        range = 200;
+    return qrand() % range;
+}
+
+void Window::paintGL()
+{
+    m_compositor->startRender();
+
+    QOpenGLFunctions *functions = context()->functions();
+    functions->glClearColor(.4f, .7f, .1f, 0.5f);
+    functions->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    m_textureBlitter.bind();
+    functions->glEnable(GL_BLEND);
+    functions->glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+    qsrand(31337);
+
+    Q_FOREACH (View *view, m_compositor->views()) {
+        if (view->isCursor())
+            continue;
+        GLuint textureId = view->getTexture();
+        QWaylandSurface *surface = view->surface();
+        if (surface && surface->isMapped()) {
+            QSize s = surface->size();
+            QPointF pos(sillyrandom(width() - s.width()), sillyrandom(height() - s.height()));
+            QRectF surfaceGeometry(pos, s);
+            QOpenGLTextureBlitter::Origin surfaceOrigin =
+                    view->currentBuffer().origin() == QWaylandSurface::OriginTopLeft
+                    ? QOpenGLTextureBlitter::OriginTopLeft
+                    : QOpenGLTextureBlitter::OriginBottomLeft;
+            QMatrix4x4 targetTransform = QOpenGLTextureBlitter::targetTransform(surfaceGeometry, QRect(QPoint(), size()));
+            m_textureBlitter.blit(textureId, targetTransform, surfaceOrigin);
+        }
+    }
+    m_textureBlitter.release();
+    m_compositor->endRender();
+}