A minimal c++-based compositor

No input handling.

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

7 files changed, 468 insertions, 0 deletions

diff --git a/examples/wayland/minimal-cpp/README b/examples/wayland/minimal-cpp/README
new file mode 100644
index 000000000..3a9a4b1b2
--- /dev/null
+++ b/examples/wayland/minimal-cpp/README
@@ -0,0 +1,7 @@
+A minimal example showing what is required to get a C++ based compositor up
+and running. Input events are not delivered to clients, to avoid the logic
+for finding the correct window and map the coordinates.
+
+See the qwindow-compositor example for information on how to implement
+support for key and mouse events, and everything else a proper desktop
+compositor needs.
diff --git a/examples/wayland/minimal-cpp/compositor.cpp b/examples/wayland/minimal-cpp/compositor.cpp
new file mode 100644
index 000000000..ea685923b
--- /dev/null
+++ b/examples/wayland/minimal-cpp/compositor.cpp
@@ -0,0 +1,124 @@
+/****************************************************************************
+**
+** 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 "compositor.h"
+#include "window.h"
+
+#include <QtWaylandCompositor/qwaylandoutput.h>
+#include <QOpenGLFunctions>
+
+GLuint View::getTexture() {
+    if (advance()) {
+        QOpenGLFunctions *functions = QOpenGLContext::currentContext()->functions();
+        if (m_texture)
+            functions->glDeleteTextures(1, &m_texture);
+
+        functions->glGenTextures(1, &m_texture);
+        functions->glBindTexture(GL_TEXTURE_2D, m_texture);
+        functions->glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+        currentBuffer().bindToTexture();
+    }
+    return m_texture;
+}
+
+bool View::isCursor() const
+{
+    return surface()->isCursorSurface();
+}
+
+Compositor::Compositor(Window *window)
+    : QWaylandCompositor()
+    , m_window(window)
+{
+}
+
+Compositor::~Compositor()
+{
+}
+
+void Compositor::create()
+{
+    new QWaylandOutput(this, m_window);
+    QWaylandCompositor::create();
+
+    connect(this, &QWaylandCompositor::surfaceCreated, this, &Compositor::onSurfaceCreated);
+}
+
+void Compositor::onSurfaceCreated(QWaylandSurface *surface)
+{
+    connect(surface, &QWaylandSurface::surfaceDestroyed, this, &Compositor::onSurfaceDestroyed);
+    connect(surface, &QWaylandSurface::redraw, this, &Compositor::triggerRender);
+    View *view = new View;
+    view->setSurface(surface);
+    view->setOutput(outputFor(m_window));
+    m_views << view;
+    connect(view, &QWaylandView::surfaceDestroyed, this, &Compositor::viewSurfaceDestroyed);
+}
+
+void Compositor::onSurfaceDestroyed()
+{
+    triggerRender();
+}
+
+void Compositor::viewSurfaceDestroyed()
+{
+    View *view = qobject_cast<View*>(sender());
+    m_views.removeAll(view);
+    delete view;
+}
+
+void Compositor::triggerRender()
+{
+    m_window->requestUpdate();
+}
+
+void Compositor::startRender()
+{
+    QWaylandOutput *out = defaultOutput();
+    if (out)
+        out->frameStarted();
+}
+
+void Compositor::endRender()
+{
+    QWaylandOutput *out = defaultOutput();
+    if (out)
+        out->sendFrameCallbacks();
+}
diff --git a/examples/wayland/minimal-cpp/compositor.h b/examples/wayland/minimal-cpp/compositor.h
new file mode 100644
index 000000000..fe379082c
--- /dev/null
+++ b/examples/wayland/minimal-cpp/compositor.h
@@ -0,0 +1,90 @@
+/****************************************************************************
+**
+** 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef COMPOSITOR_H
+#define COMPOSITOR_H
+
+#include <QtWaylandCompositor/QWaylandCompositor>
+#include <QtWaylandCompositor/QWaylandSurface>
+#include <QtWaylandCompositor/QWaylandView>
+
+QT_BEGIN_NAMESPACE
+
+class Window;
+
+class View : public QWaylandView
+{
+    Q_OBJECT
+public:
+    View() : m_texture(0) {}
+    GLuint getTexture();
+    bool isCursor() const;
+private:
+    friend class Compositor;
+    GLuint m_texture;
+};
+
+class Compositor : public QWaylandCompositor
+{
+    Q_OBJECT
+public:
+    Compositor(Window *window);
+    ~Compositor();
+    void create() Q_DECL_OVERRIDE;
+
+    QList<View*> views() const { return m_views; }
+
+    void startRender();
+    void endRender();
+
+private slots:
+    void onSurfaceCreated(QWaylandSurface *surface);
+    void onSurfaceDestroyed();
+    void triggerRender();
+
+    void viewSurfaceDestroyed();
+private:
+    Window *m_window;
+    QList<View*> m_views;
+};
+
+QT_END_NAMESPACE
+
+#endif // COMPOSITOR_H
diff --git a/examples/wayland/minimal-cpp/main.cpp b/examples/wayland/minimal-cpp/main.cpp
new file mode 100644
index 000000000..db4a67ac6
--- /dev/null
+++ b/examples/wayland/minimal-cpp/main.cpp
@@ -0,0 +1,57 @@
+/****************************************************************************
+**
+** 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 <QGuiApplication>
+#include "window.h"
+#include "compositor.h"
+
+int main(int argc, char *argv[])
+{
+    QGuiApplication app(argc, argv);
+
+    Window window;
+    Compositor compositor(&window);
+    window.setCompositor(&compositor);
+    compositor.create();
+    window.resize(800,600);
+    window.show();
+
+    return app.exec();
+}
diff --git a/examples/wayland/minimal-cpp/minimal-cpp.pro b/examples/wayland/minimal-cpp/minimal-cpp.pro
new file mode 100644
index 000000000..46e422f69
--- /dev/null
+++ b/examples/wayland/minimal-cpp/minimal-cpp.pro
@@ -0,0 +1,20 @@
+QT += gui gui-private core-private waylandcompositor waylandcompositor-private
+
+LIBS += -L ../../lib
+
+HEADERS += \
+    compositor.h \
+    window.h
+
+SOURCES += main.cpp \
+    compositor.cpp \
+    window.cpp
+
+# to make QtWaylandCompositor/... style includes working without installing
+INCLUDEPATH += $$PWD/../../include
+
+
+target.path = $$[QT_INSTALL_EXAMPLES]/wayland/minimal-cpp
+sources.files = $$SOURCES $$HEADERS $$RESOURCES $$FORMS minimal-cpp.pro
+sources.path = $$[QT_INSTALL_EXAMPLES]/wayland/minimal-cpp
+INSTALLS += target sources
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();
+}
diff --git a/examples/wayland/minimal-cpp/window.h b/examples/wayland/minimal-cpp/window.h
new file mode 100644
index 000000000..c468abbbe
--- /dev/null
+++ b/examples/wayland/minimal-cpp/window.h
@@ -0,0 +1,68 @@
+/****************************************************************************
+**
+** 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef WINDOW_H
+#define WINDOW_H
+
+#include <QOpenGLWindow>
+#include <QtGui/private/qopengltextureblitter_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class Compositor;
+
+class Window : public QOpenGLWindow
+{
+public:
+    Window();
+    void setCompositor(Compositor *comp);
+
+protected:
+    void initializeGL() Q_DECL_OVERRIDE;
+    void paintGL() Q_DECL_OVERRIDE;
+
+private:
+    QOpenGLTextureBlitter m_textureBlitter;
+    Compositor *m_compositor;
+};
+
+QT_END_NAMESPACE
+
+#endif //WINDOW_H