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/****************************************************************************
**
** Copyright (C) 2016 Klaralvdalens Datakonsult AB (KDAB).
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
****************************************************************************/
#ifndef QT3DRENDER_RENDER_TEXTUREDATAMANAGER_H
#define QT3DRENDER_RENDER_TEXTUREDATAMANAGER_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 <QMutex>
#include <QMutexLocker>
#include <Qt3DRender/qtexture.h>
#include <Qt3DRender/qtextureimagedata.h>
#include <Qt3DRender/qtexturegenerator.h>
#include <Qt3DRender/qtextureimagedatagenerator.h>
#include <Qt3DRender/private/qt3drender_global_p.h>
QT_BEGIN_NAMESPACE
namespace Qt3DRender {
namespace Render {
/**
* The texture data managers associates each texture data generator
* with the data objects generated by them. That is, either
*
* QTextureImageDataGenerator -> QTextureImageData, or
* QTextureGenerator -> QTextureData
*
* This way, texture classes only need to refer to the texture functors used.
* Aspect jobs will make sure that at the start of each frame, all generators
* registered with the GeneratorDataManagers have been executed.
*
* This guarantees that no texture data generator is executed twice.
*
* Each Generator is associated with a number of textures that reference it.
* If the last texture disassociates from a generator, the QTextureData will
* be deleted.
*/
template <class GeneratorPtr, class DataPtr, class ReferencedType>
class GeneratorDataManager
{
public:
GeneratorDataManager() {}
/*!
* If no data for the given generator exists, make sure that the
* generators are executed the next frame. Reference generator by
* given texture
*
* Returns true if the Entry for a given generator had to be created
*/
bool requestData(const GeneratorPtr &generator, ReferencedType r)
{
QMutexLocker lock(&m_mutex);
Entry *entry = findEntry(generator);
const bool needsToBeCreated = (entry == nullptr);
if (needsToBeCreated)
entry = createEntry(generator);
Q_ASSERT(entry);
if (!entry->referencingObjects.contains(r))
entry->referencingObjects.push_back(r);
return needsToBeCreated;
}
/*!
* Dereference given generator from texture. If no other textures still reference
* the generator, the associated data will be deleted
*/
void releaseData(const GeneratorPtr &generator, ReferencedType r)
{
QMutexLocker lock(&m_mutex);
const auto end = m_data.end();
for (auto it = m_data.begin(); it != end; ++it) {
Entry &entry = *it;
if (*entry.generator == *generator) {
entry.referencingObjects.removeAll(r);
// delete, if that was the last reference
if (entry.referencingObjects.empty()) {
m_data.erase(it);
return;
}
}
}
}
/*!
* Return data associated with given generator, if existent
*/
DataPtr getData(const GeneratorPtr &generator)
{
QMutexLocker lock(&m_mutex);
const Entry *entry = findEntry(generator);
return entry ? entry->data : DataPtr();
}
/*!
* Returns all generators that were not yet executed
*/
QVector<GeneratorPtr> pendingGenerators()
{
QMutexLocker lock(&m_mutex);
QVector<GeneratorPtr> ret;
for (const Entry &entry : m_data)
if (!entry.data && !ret.contains(entry.generator))
ret.push_back(entry.generator);
return ret;
}
/*!
* Assigns a piece of data to the generator that was used to
* create it.
*/
void assignData(const GeneratorPtr &generator, const DataPtr &data)
{
QMutexLocker lock(&m_mutex);
Entry *entry = findEntry(generator);
if (!entry) {
qWarning() << "[TextureDataManager] assignData() called with non-existent generator";
return;
}
entry->data = data;
}
bool contains(const GeneratorPtr &generator)
{
return findEntry(generator) != nullptr;
}
private:
struct Entry {
GeneratorPtr generator;
QVector<ReferencedType> referencingObjects;
DataPtr data;
};
/*!
* Helper function: return entry for given generator if it exists, nullptr
* otherwise.
*/
Entry* findEntry(const GeneratorPtr &generator)
{
for (int i = 0, sz = m_data.size(); i < sz; ++i)
if (*m_data[i].generator == *generator)
return &m_data[i];
return nullptr;
}
Entry *createEntry(const GeneratorPtr &generator)
{
Entry newEntry;
newEntry.generator = generator;
m_data.push_back(newEntry);
return &m_data.back();
}
QMutex m_mutex;
QVector<Entry> m_data;
};
class QT3DRENDERSHARED_PRIVATE_EXPORT TextureDataManager
: public GeneratorDataManager<QTextureGeneratorPtr, QTextureDataPtr, void*>
{
};
class QT3DRENDERSHARED_PRIVATE_EXPORT TextureImageDataManager
: public GeneratorDataManager<QTextureImageDataGeneratorPtr, QTextureImageDataPtr, Qt3DCore::QNodeId>
{
};
} // namespace Render
} // namespace Qt3DRender
QT_END_NAMESPACE
#endif // TEXTUREDATAMANAGER_H
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