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/****************************************************************************
**
** Copyright (C) 2015 Klaralvdalens Datakonsult AB (KDAB).
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of Qt 3D Studio.
**
** $QT_BEGIN_LICENSE:GPL$
** 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 General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) 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.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-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef DRAGONTASK_P_H
#define DRAGONTASK_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of other Qt classes. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QSharedPointer>
#include <Qt3DCore/QAspectJob>
#include <functional>
QT_BEGIN_NAMESPACE
namespace Qt3DRender {
namespace Dragon {
/*!
* \internal
* Simple wrapper around a value to make it easier for other jobs to
* use tasks as input.
*
* TODO: Consider removing as this adds unnecessary jobs.
*/
template <typename Output>
class SourceTask : public Qt3DCore::QAspectJob
{
public:
using result_type = Output;
SourceTask()
: QAspectJob()
{
}
SourceTask(const SourceTask &other)
: QAspectJob()
, m_result(other.m_result)
{
}
void setInput(Output argument)
{
m_hasInput = true;
m_isFinished = true;
m_result = argument;
}
void run()
{
Q_ASSERT(false); // the source tasks don't need to be run
}
const Output &result() const
{
Q_ASSERT(m_isFinished);
return m_result;
}
bool isFinished() const { return m_isFinished; }
private:
Output m_result;
bool m_hasInput = false;
bool m_isFinished = false;
};
template <typename Output>
using SourceTaskPtr = QSharedPointer<SourceTask<Output>>;
// TODO rename
// TODO consider using an enum instead
struct SelfT
{
explicit SelfT() = default;
};
constexpr SelfT Self;
template <typename Output>
struct Task : public Qt3DCore::QAspectJob
{
// using Callable = std::function<Output(Output, Inputs...)>;
using result_type = Output;
template <typename Callable, typename... Tasks>
Task(Callable callable, SelfT self, Tasks... tasks)
: Qt3DCore::QAspectJob()
, m_function(createSelfFunction(callable, tasks...))
{
Q_UNUSED(self);
addDeps(tasks...);
}
template <typename Callable, typename... Tasks>
Task(Callable callable, Tasks... tasks)
: Qt3DCore::QAspectJob()
, m_function(createFunction(callable, tasks...))
{
addDeps(tasks...);
}
Task(const Task &other)
: Qt3DCore::QAspectJob()
, m_function(other.m_function)
, m_result(other.m_result)
{
}
template<typename Dependency>
void addDep(Dependency dep)
{
Q_UNUSED(dep);
}
template<typename U>
void addDep(QSharedPointer<Task<U>> dep)
{
addDependency(dep);
}
// TODO consider getting rid of SourceTask
template<typename U>
void addDep(QSharedPointer<SourceTask<U>> dep)
{
addDependency(dep);
}
void addDeps() {}
template <typename Dependency, typename... Dependencies>
void addDeps(Dependency dep, Dependencies... deps)
{
Q_UNUSED(dep);
addDep(dep);
addDeps(deps...);
}
void assertTaskFinished() {}
template <typename OtherTask, typename... Tasks>
void assertTaskFinished(OtherTask task, Tasks... tasks)
{
Q_ASSERT(task != nullptr);
Q_ASSERT(task->isFinished());
assertTaskFinished(tasks...);
}
template <typename Callable, typename... Tasks>
std::function<void()> createSelfFunction(Callable callable, Tasks... tasks)
{
return [this, callable, tasks...]() {
assertTaskFinished(tasks...);
m_result = callable(std::move(m_result), (tasks->result())...);
};
}
template <typename Callable, typename... Tasks>
std::function<void()> createFunction(Callable callable, Tasks... tasks)
{
return [this, callable, tasks...]() {
assertTaskFinished(tasks...);
m_result = callable((tasks->result())...);
};
}
void run()
{
m_function();
// TODO is never reset, consider adding a function to reset after all jobs finished
// TODO if so, take into consideration cached results
m_isFinished = true;
}
const Output &result() const
{
Q_ASSERT(m_isFinished);
return m_result;
}
bool isFinished() const { return m_isFinished; }
private:
std::function<void()> m_function;
Output m_result;
bool m_isFinished = false;
};
template <typename Output>
using TaskPtr = QSharedPointer<Task<Output>>;
} // namespace Dragon
} // namespace Qt3DRender
QT_END_NAMESPACE
#endif // DRAGONTASK_P_H
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