[Shader Graph Gen.] Introduce QShaderGraph

This allows to connect our nodes together via ports. This way user code
can assemble a shader from simpler blocks.

Change-Id: I168dcf4af6aa11ad47b68d91e5a55e96ca922678
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

3 files changed, 190 insertions, 0 deletions

diff --git a/src/gui/util/qshadergraph.cpp b/src/gui/util/qshadergraph.cpp
new file mode 100644
index 0000000000..0735c3cfe3
--- /dev/null
+++ b/src/gui/util/qshadergraph.cpp
@@ -0,0 +1,88 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 Klaralvdalens Datakonsult AB (KDAB).
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtGui 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 The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/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 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qshadergraph_p.h"
+
+QT_BEGIN_NAMESPACE
+
+void QShaderGraph::addNode(const QShaderNode &node)
+{
+    removeNode(node);
+    m_nodes.append(node);
+}
+
+void QShaderGraph::removeNode(const QShaderNode &node)
+{
+    const auto it = std::find_if(m_nodes.begin(), m_nodes.end(),
+                                 [node] (const QShaderNode &n) { return n.uuid() == node.uuid(); });
+    if (it != m_nodes.end())
+        m_nodes.erase(it);
+}
+
+QVector<QShaderNode> QShaderGraph::nodes() const Q_DECL_NOTHROW
+{
+    return m_nodes;
+}
+
+void QShaderGraph::addEdge(const QShaderGraph::Edge &edge)
+{
+    if (m_edges.contains(edge))
+        return;
+    m_edges.append(edge);
+}
+
+void QShaderGraph::removeEdge(const QShaderGraph::Edge &edge)
+{
+    m_edges.removeAll(edge);
+}
+
+QVector<QShaderGraph::Edge> QShaderGraph::edges() const Q_DECL_NOTHROW
+{
+    return m_edges;
+}
+
+bool operator==(const QShaderGraph::Edge &lhs, const QShaderGraph::Edge &rhs) Q_DECL_NOTHROW
+{
+    return lhs.sourceNodeUuid == rhs.sourceNodeUuid
+        && lhs.sourcePortName == rhs.sourcePortName
+        && lhs.targetNodeUuid == rhs.targetNodeUuid
+        && lhs.targetPortName == rhs.targetPortName;
+}
+
+QT_END_NAMESPACE
diff --git a/src/gui/util/qshadergraph_p.h b/src/gui/util/qshadergraph_p.h
new file mode 100644
index 0000000000..c582dcd18b
--- /dev/null
+++ b/src/gui/util/qshadergraph_p.h
@@ -0,0 +1,100 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 Klaralvdalens Datakonsult AB (KDAB).
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtGui 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 The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/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 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QSHADERGRAPH_P_H
+#define QSHADERGRAPH_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtGui/private/qtguiglobal_p.h>
+
+#include <QtGui/private/qshadernode_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QShaderGraph
+{
+public:
+    class Edge
+    {
+    public:
+        QUuid sourceNodeUuid;
+        QString sourcePortName;
+        QUuid targetNodeUuid;
+        QString targetPortName;
+    };
+
+    Q_GUI_EXPORT void addNode(const QShaderNode &node);
+    Q_GUI_EXPORT void removeNode(const QShaderNode &node);
+    Q_GUI_EXPORT QVector<QShaderNode> nodes() const Q_DECL_NOTHROW;
+
+    Q_GUI_EXPORT void addEdge(const Edge &edge);
+    Q_GUI_EXPORT void removeEdge(const Edge &edge);
+    Q_GUI_EXPORT QVector<Edge> edges() const Q_DECL_NOTHROW;
+
+private:
+    QVector<QShaderNode> m_nodes;
+    QVector<Edge> m_edges;
+};
+
+Q_GUI_EXPORT bool operator==(const QShaderGraph::Edge &lhs, const QShaderGraph::Edge &rhs) Q_DECL_NOTHROW;
+
+inline bool operator!=(const QShaderGraph::Edge &lhs, const QShaderGraph::Edge &rhs) Q_DECL_NOTHROW
+{
+    return !(lhs == rhs);
+}
+
+Q_DECLARE_TYPEINFO(QShaderGraph, Q_MOVABLE_TYPE);
+Q_DECLARE_TYPEINFO(QShaderGraph::Edge, Q_MOVABLE_TYPE);
+
+QT_END_NAMESPACE
+
+Q_DECLARE_METATYPE(QShaderGraph)
+Q_DECLARE_METATYPE(QShaderGraph::Edge)
+
+#endif // QSHADERGRAPH_P_H
diff --git a/src/gui/util/util.pri b/src/gui/util/util.pri
index d467d9dc57..96b25df4f9 100644
--- a/src/gui/util/util.pri
+++ b/src/gui/util/util.pri
@@ -8,6 +8,7 @@ HEADERS += \
         util/qabstractlayoutstyleinfo_p.h \
         util/qlayoutpolicy_p.h \
         util/qshaderformat_p.h \
+        util/qshadergraph_p.h \
         util/qshadernode_p.h \
         util/qshadernodeport_p.h
 
@@ -18,5 +19,6 @@ SOURCES += \
         util/qabstractlayoutstyleinfo.cpp \
         util/qlayoutpolicy.cpp \
         util/qshaderformat.cpp \
+        util/qshadergraph.cpp \
         util/qshadernode.cpp \
         util/qshadernodeport.cpp