Initial version of new software backend for the QtQuick scene graph

Based on the scene graph plugin from Qt Gerrit playground

Change-Id: Ic6e65f912fef70ba5f153113ce68107b56608151
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

6 files changed, 351 insertions, 0 deletions

diff --git a/softwarecontext/context.cpp b/softwarecontext/context.cpp
new file mode 100644
index 0000000000..e65b854af8
--- /dev/null
+++ b/softwarecontext/context.cpp
@@ -0,0 +1,108 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Scenegraph Playground module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "context.h"
+
+#include <QtCore/QCoreApplication>
+#include <QtCore/QElapsedTimer>
+
+#include <QtGui/QWindow>
+
+#include <QtQuick/QSGFlatColorMaterial>
+#include <QtQuick/QSGVertexColorMaterial>
+#include <QtQuick/QSGOpaqueTextureMaterial>
+#include <QtQuick/QSGTextureMaterial>
+#include <private/qsgdefaultimagenode_p.h>
+#include <private/qsgdefaultrectanglenode_p.h>
+#include <private/qsgdistancefieldglyphnode_p_p.h>
+#include <private/qsgdefaultglyphnode_p.h>
+
+#ifndef QSG_NO_RENDERER_TIMING
+static bool qsg_render_timing = !qgetenv("QSG_RENDER_TIMING").isEmpty();
+#endif
+
+namespace SoftwareContext
+{
+
+RenderContext::RenderContext(QSGContext *ctx)
+    : QSGRenderContext(ctx)
+{
+}
+Context::Context(QObject *parent)
+    : QSGContext(parent)
+{
+}
+
+void RenderContext::initialize(QOpenGLContext *context)
+{
+    QSGRenderContext::initialize(context);
+}
+
+void RenderContext::invalidate()
+{
+    QSGRenderContext::invalidate();
+}
+
+QSGTexture *RenderContext::createTexture(const QImage &image) const
+{
+    return QSGRenderContext::createTexture(image);
+}
+
+QSGTexture *RenderContext::createTextureNoAtlas(const QImage &image) const
+{
+    return QSGRenderContext::createTextureNoAtlas(image);
+}
+
+QSGRenderer *RenderContext::createRenderer()
+{
+    return QSGRenderContext::createRenderer();
+}
+
+
+void RenderContext::renderNextFrame(QSGRenderer *renderer, GLuint fbo)
+{
+    QSGRenderContext::renderNextFrame(renderer, fbo);
+}
+
+
+
+
+} // namespace
diff --git a/softwarecontext/context.h b/softwarecontext/context.h
new file mode 100644
index 0000000000..6ab405c890
--- /dev/null
+++ b/softwarecontext/context.h
@@ -0,0 +1,78 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Copyright (C) 2014 Jolla Ltd, author: <gunnar.sletta@jollamobile.com>
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Scenegraph Playground module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef CONTEXT_H
+#define CONTEXT_H
+
+#include <private/qsgcontext_p.h>
+#include <QtCore/QElapsedTimer>
+#include <QtGui/QOpenGLShaderProgram>
+
+namespace SoftwareContext
+{
+
+class RenderContext : public QSGRenderContext
+{
+public:
+    RenderContext(QSGContext *ctx);
+    void initialize(QOpenGLContext *context);
+    void invalidate();
+    void renderNextFrame(QSGRenderer *renderer, GLuint fbo);
+    QSGTexture *createTexture(const QImage &image) const;
+    QSGTexture *createTextureNoAtlas(const QImage &image) const;
+    QSGRenderer *createRenderer();
+};
+
+class Context : public QSGContext
+{
+    Q_OBJECT
+public:
+    explicit Context(QObject *parent = 0);
+
+    QSGRenderContext *createRenderContext() { return new RenderContext(this); }
+
+private:
+};
+
+} // namespace
+
+#endif // CONTEXT_H
diff --git a/softwarecontext/pluginmain.cpp b/softwarecontext/pluginmain.cpp
new file mode 100644
index 0000000000..192e6225bc
--- /dev/null
+++ b/softwarecontext/pluginmain.cpp
@@ -0,0 +1,71 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Scenegraph Playground module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+
+#include "pluginmain.h"
+#include "context.h"
+
+ContextPlugin::ContextPlugin(QObject *parent)
+    : QSGContextPlugin(parent)
+{
+}
+
+QStringList ContextPlugin::keys() const
+{
+    return QStringList() << QLatin1String("softwarecontext");
+}
+
+QSGContext *ContextPlugin::create(const QString &) const
+{
+    if (!instance)
+        instance = new SoftwareContext::Context();
+    return instance;
+}
+
+QQuickTextureFactory *ContextPlugin::createTextureFactoryFromImage(const QImage &image)
+{
+    return 0;
+}
+
+SoftwareContext::Context *ContextPlugin::instance = 0;
+
+
+
diff --git a/softwarecontext/pluginmain.h b/softwarecontext/pluginmain.h
new file mode 100644
index 0000000000..f8ebf3cb9b
--- /dev/null
+++ b/softwarecontext/pluginmain.h
@@ -0,0 +1,68 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Scenegraph Playground module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef PLUGINMAIN_H
+#define PLUGINMAIN_H
+
+#include <private/qsgcontext_p.h>
+#include <private/qsgcontextplugin_p.h>
+
+#include <qplugin.h>
+
+#include "context.h"
+
+class ContextPlugin : public QSGContextPlugin
+{
+    Q_OBJECT
+
+    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QSGContextFactoryInterface" FILE "softwarecontext.json")
+
+public:
+    ContextPlugin(QObject *parent = 0);
+
+    QStringList keys() const;
+    QSGContext *create(const QString &key) const;
+    QQuickTextureFactory *createTextureFactoryFromImage(const QImage &image);
+
+    static SoftwareContext::Context *instance;
+};
+
+#endif // PLUGINMAIN_H
diff --git a/softwarecontext/softwarecontext.json b/softwarecontext/softwarecontext.json
new file mode 100644
index 0000000000..ca87c6c38a
--- /dev/null
+++ b/softwarecontext/softwarecontext.json
@@ -0,0 +1,3 @@
+{
+    "Keys": ["softwarecontext"]
+}
diff --git a/softwarecontext/softwarecontext.pro b/softwarecontext/softwarecontext.pro
new file mode 100644
index 0000000000..1d1aea4df1
--- /dev/null
+++ b/softwarecontext/softwarecontext.pro
@@ -0,0 +1,23 @@
+TEMPLATE=lib
+TARGET=softwarecontext
+
+CONFIG += plugin
+
+QT += gui-private core-private quick-private qml-private
+
+SOURCES += \
+    context.cpp \
+    pluginmain.cpp
+
+HEADERS += \
+    context.h \
+    pluginmain.h
+
+OTHER_FILES += softwarecontext.json
+
+target.path +=  $$[QT_INSTALL_PLUGINS]/scenegraph
+
+files.path += $$[QT_INSTALL_PLUGINS]/scenegraph
+
+INSTALLS += target files
+