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Diffstat (limited to 'src/render/backend/entityaccumulator.cpp')
-rw-r--r-- | src/render/backend/entityaccumulator.cpp | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/src/render/backend/entityaccumulator.cpp b/src/render/backend/entityaccumulator.cpp new file mode 100644 index 000000000..f003420dd --- /dev/null +++ b/src/render/backend/entityaccumulator.cpp @@ -0,0 +1,99 @@ +/**************************************************************************** +** +** Copyright (C) 2019 Klaralvdalens Datakonsult AB (KDAB). +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the Qt3D 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 "entityaccumulator_p.h" +#include "entityvisitor_p.h" + +QT_USE_NAMESPACE +using namespace Qt3DRender::Render; + +namespace { + +class Accumulator : public EntityVisitor +{ +public: + Accumulator(std::function<bool(Entity *)> predicate, NodeManagers *manager) + : EntityVisitor(manager) + , m_predicate(predicate) + { + } + + EntityVisitor::Operation visit(Entity *entity) override { + if (m_predicate(entity)) + m_entities << entity; + return Continue; + } + + QVector<Entity *> m_entities; + +private: + std::function<bool(Entity *)> m_predicate; +}; + +} + +EntityAccumulator::EntityAccumulator(NodeManagers *manager) + : m_manager(manager) + , m_predicate([](Entity*) { return true; }) +{ + +} + +EntityAccumulator::EntityAccumulator(std::function<bool (Entity *)> predicate, NodeManagers *manager) + : m_manager(manager) + , m_predicate(predicate) +{ + +} + +/*! + * \internal + * + * Call this to traverse the scene graph and return all entities for + * which the predicate returns true. + * + * Can be useful to get all the entities that contain a specific type + * of component. + */ +QVector<Entity *> EntityAccumulator::apply(Entity *root) const +{ + Accumulator a(m_predicate, m_manager); + a.apply(root); + return a.m_entities; +} |