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Diffstat (limited to 'src/render/backend/apishadermanager_p.h')
| -rw-r--r-- | src/render/backend/apishadermanager_p.h | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/src/render/backend/apishadermanager_p.h b/src/render/backend/apishadermanager_p.h new file mode 100644 index 000000000..9ebf49710 --- /dev/null +++ b/src/render/backend/apishadermanager_p.h @@ -0,0 +1,224 @@ +/**************************************************************************** +** +** Copyright (C) 2017 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. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef QT3DRENDER_RENDER_APISHADERMANAGER_H +#define QT3DRENDER_RENDER_APISHADERMANAGER_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 <Qt3DCore/qnodeid.h> +#include <Qt3DRender/private/shader_p.h> +#include <QtCore/QReadLocker> + +QT_BEGIN_NAMESPACE + +namespace Qt3DRender { + +namespace Render { + +class Shader; + +template<class APIShader> +class APIShaderManager +{ +public: + explicit APIShaderManager() + { + } + + ~APIShaderManager() + { + } + + QVector<APIShader *> takeActiveResources() const + { + QReadLocker lock(&m_readWriteLock); + return m_apiShaders.keys().toVector() + m_abandonedShaders; + } + + APIShader *lookupResource(Qt3DCore::QNodeId shaderId) + { + QReadLocker lock(&m_readWriteLock); + return m_nodeIdToAPIShader.value(shaderId); + } + + // Note: automatically adopts the Shader if it needs to be created + APIShader *createOrAdoptExisting(const Shader *shader) + { + // Try to find if an APIShader that matches shader + // already exists + + { + QReadLocker readLock(&m_readWriteLock); + { + const auto end = m_apiShaders.cend(); + for (auto it = m_apiShaders.cbegin(); it != end; ++it) + if (isSameShader(it.key(), shader)) { + APIShader *apiShader = it.key(); + // Adopt if needed + readLock.unlock(); + adopt(apiShader, shader); + return apiShader; + } + } + + // Try to find if one of the scheduled for deletion APIShader + // could be reused + { + const auto end = m_abandonedShaders.end(); + for (auto it = m_abandonedShaders.begin(); it != end; ++it) + if (isSameShader(*it, shader)) { + APIShader *apiShader = *it; + // Adopt if needed + readLock.unlock(); + // Remove from list of shaders scheduled for relase + m_abandonedShaders.erase(it); + adopt(apiShader, shader); + return apiShader; + } + } + } + + // If not create one + APIShader *apiShader = create(); + adopt(apiShader, shader); + return apiShader; + } + + // Should never be called from outside code + // but left public to maintain adopt/abandon symmetry + void adopt(APIShader *apiShader, const Shader *shader) + { + QWriteLocker lock(&m_readWriteLock); + if (!m_apiShaders[apiShader].contains(shader->peerId())) { + m_apiShaders[apiShader].push_back(shader->peerId()); + m_nodeIdToAPIShader.insert(shader->peerId(), apiShader); + } + } + + void abandon(APIShader *apiShader, const Shader *shader) + { + QWriteLocker lock(&m_readWriteLock); + APIShader *storedApiShader = m_nodeIdToAPIShader.take(shader->peerId()); + Q_ASSERT(apiShader != nullptr && apiShader == storedApiShader); + + QVector<Qt3DCore::QNodeId> &referencedShaderNodes = m_apiShaders[apiShader]; + referencedShaderNodes.removeAll(shader->peerId()); + + if (referencedShaderNodes.empty()) { + m_abandonedShaders.push_back(apiShader); + m_apiShaders.remove(apiShader); + } + } + + QVector<APIShader *> takeAbandonned() + { + QWriteLocker lock(&m_readWriteLock); + return std::move(m_abandonedShaders); + } + + QVector<APIShader *> takeUpdated() + { + QWriteLocker lock(&m_readWriteLock); + return std::move(m_updatedShaders); + } + + QVector<Qt3DCore::QNodeId> shaderIdsForProgram(APIShader *glShader) const + { + QReadLocker lock(&m_readWriteLock); + return m_apiShaders.value(glShader); + } + + void purge() + { + qDeleteAll(takeAbandonned()); + } + +private: + + bool isSameShader(const APIShader *apiShader, const Shader *shaderNode) + { + const QVector<QByteArray> nodeShaderCode = shaderNode->shaderCode(); + const QVector<QByteArray> apiShaderCode = apiShader->shaderCode(); + + const int s = nodeShaderCode.size(); + + Q_ASSERT(s == apiShaderCode.size()); + + for (int i = 0; i < s; ++i) + if (nodeShaderCode.at(i) != apiShaderCode.at(i)) + return false; + + return true; + } + + APIShader *create() + { + APIShader *apiShader = new APIShader(); + m_updatedShaders.push_back(apiShader); + return apiShader; + } + + + QHash<Qt3DCore::QNodeId, APIShader *> m_nodeIdToAPIShader; + QHash<APIShader *, QVector<Qt3DCore::QNodeId>> m_apiShaders; + + QVector<APIShader *> m_abandonedShaders; + QVector<APIShader *> m_updatedShaders; + + mutable QReadWriteLock m_readWriteLock; +}; + +} // Render + +} // Qt3DRender + +QT_END_NAMESPACE + +#endif // QT3DRENDER_RENDER_APISHADERMANAGER_H |