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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt Quick module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QSGDEPTHSTENCILBUFFER_P_H
#define QSGDEPTHSTENCILBUFFER_P_H
#include <QtCore/qsize.h>
#include <QtGui/private/qopenglcontext_p.h>
#include <QtGui/private/qopenglextensions_p.h>
#include <QtCore/qsharedpointer.h>
#include <QtCore/qhash.h>
QT_BEGIN_NAMESPACE
class QSGDepthStencilBufferManager;
class QSGDepthStencilBuffer
{
public:
enum Attachment
{
NoAttachment = 0x00,
DepthAttachment = 0x01,
StencilAttachment = 0x02
};
Q_DECLARE_FLAGS(Attachments, Attachment)
struct Format
{
QSize size;
int samples;
QSGDepthStencilBuffer::Attachments attachments;
bool operator == (const Format &other) const;
};
QSGDepthStencilBuffer(QOpenGLContext *context, const Format &format);
virtual ~QSGDepthStencilBuffer();
// Attaches this depth stencil buffer to the currently bound FBO.
void attach();
// Detaches this depth stencil buffer from the currently bound FBO.
void detach();
QSize size() const { return m_format.size; }
int samples() const { return m_format.samples; }
Attachments attachments() const { return m_format.attachments; }
protected:
virtual void free() = 0;
QOpenGLExtensions m_functions;
QSGDepthStencilBufferManager *m_manager;
Format m_format;
GLuint m_depthBuffer;
GLuint m_stencilBuffer;
friend class QSGDepthStencilBufferManager;
};
Q_DECLARE_OPERATORS_FOR_FLAGS(QSGDepthStencilBuffer::Attachments)
inline bool QSGDepthStencilBuffer::Format::operator == (const Format &other) const
{
return size == other.size && samples == other.samples && attachments == other.attachments;
}
class QSGDefaultDepthStencilBuffer : public QSGDepthStencilBuffer
{
public:
QSGDefaultDepthStencilBuffer(QOpenGLContext *context, const Format &format);
virtual ~QSGDefaultDepthStencilBuffer();
protected:
virtual void free();
};
class QSGDepthStencilBufferManager
{
public:
QSGDepthStencilBufferManager(QOpenGLContext *ctx) : m_context(ctx) { }
~QSGDepthStencilBufferManager();
QOpenGLContext *context() const { return m_context; }
QSharedPointer<QSGDepthStencilBuffer> bufferForFormat(const QSGDepthStencilBuffer::Format &fmt);
void insertBuffer(const QSharedPointer<QSGDepthStencilBuffer> &buffer);
private:
typedef QHash<QSGDepthStencilBuffer::Format, QWeakPointer<QSGDepthStencilBuffer> > Hash;
QOpenGLContext *m_context;
Hash m_buffers;
friend class QSGDepthStencilBuffer;
};
extern uint qHash(const QSGDepthStencilBuffer::Format &format);
QT_END_NAMESPACE
#endif
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