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/****************************************************************************
**
** Copyright (C) 2016 Klaralvdalens Datakonsult AB (KDAB).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL3$
** 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 http://www.qt.io/terms-conditions. For further
** information use the contact form at http://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.LGPLv3 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.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 later 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 2.0 requirements will be
** met: http://www.gnu.org/licenses/gpl-2.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "shadercache_p.h"
#include <QtCore/QMutexLocker>
QT_BEGIN_NAMESPACE
namespace Qt3DRender {
namespace Render {
/*!
* \internal
*
* Destroys the ShaderCache and deletes all cached QOpenGLShaderPrograms
*/
ShaderCache::~ShaderCache()
{
qDeleteAll(m_programHash);
}
/*!
* \internal
*
* Looks up the QOpenGLShaderProgram corresponding to \a dna. Also checks to see if the cache
* contains a reference to this shader program from the Shader with peerId of \a shaderPeerId.
* If there is no existing reference for \a shaderPeerId, one is recorded.
*
* \return A pointer to the shader program if it is cached, nullptr otherwise
*/
QOpenGLShaderProgram *ShaderCache::getShaderProgramAndAddRef(ProgramDNA dna, Qt3DCore::QNodeId shaderPeerId)
{
auto shaderProgram = m_programHash.value(dna, nullptr);
if (shaderProgram) {
// Ensure we store the fact that shaderPeerId references this shader
QMutexLocker lock(&m_refsMutex);
QVector<Qt3DCore::QNodeId> &programRefs = m_programRefs[dna];
auto it = std::lower_bound(programRefs.begin(), programRefs.end(), shaderPeerId);
if (*it != shaderPeerId)
programRefs.insert(it, shaderPeerId);
}
return shaderProgram;
}
/*!
* \internal
*
* Inserts the \a program in the cache indexed by \a dna and adds a reference to it from
* \a shaderPeerId. The cache takes ownership of the \a program.
*/
void ShaderCache::insert(ProgramDNA dna, Qt3DCore::QNodeId shaderPeerId, QOpenGLShaderProgram *program)
{
Q_ASSERT(!m_programHash.contains(dna));
m_programHash.insert(dna, program);
QMutexLocker lock(&m_refsMutex);
Q_ASSERT(!m_programRefs.contains(dna));
QVector<Qt3DCore::QNodeId> programRefs;
programRefs.push_back(shaderPeerId);
m_programRefs.insert(dna, programRefs);
}
/*!
* \internal
*
* Removes a reference to the shader program indexed by \a dna from the Shader with peerId of
* \a shaderPeerId. If this was the last reference, the dna and corresponding shader are added
* to a list of items to be removed by the next call to purge.
*/
void ShaderCache::removeRef(ProgramDNA dna, Qt3DCore::QNodeId shaderPeerId)
{
QMutexLocker lock(&m_refsMutex);
auto it = m_programRefs.find(dna);
if (it != m_programRefs.end()) {
QVector<Qt3DCore::QNodeId> &programRefs = it.value();
programRefs.removeOne(shaderPeerId);
if (programRefs.isEmpty())
m_pendingRemoval.append(dna);
}
}
/*!
* \internal
*
* Iterates through a list of program dna's and checks to see if they still have no references
* from Shaders. If so, the dna and corresponding QOpenGLShaderProgram are removed from the cache.
*/
void ShaderCache::purge()
{
QMutexLocker lock(&m_refsMutex);
for (const ProgramDNA &dna : qAsConst(m_pendingRemoval)) {
QVector<Qt3DCore::QNodeId> &programRefs = m_programRefs[dna];
if (programRefs.isEmpty()) {
delete m_programHash.take(dna);
m_programRefs.remove(dna);
}
}
m_pendingRemoval.clear();
}
/*!
* \internal
*
* Deletes all cached shader programs and removes any references
*/
void ShaderCache::clear()
{
QMutexLocker lock(&m_refsMutex);
qDeleteAll(m_programHash);
m_programHash.clear();
m_programRefs.clear();
m_pendingRemoval.clear();
}
QOpenGLShaderProgram *ShaderCache::getShaderProgramForDNA(ProgramDNA dna) const
{
return m_programHash.value(dna, nullptr);
}
} // namespace Render
} // namespace Qt3DRender
QT_END_NAMESPACE
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