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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtQuick3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 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 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QGLEXT_P_H
#define QGLEXT_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtOpenGL/qgl.h>
#include "qt3dglobal.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
// Provide some useful OpenGL extension definitions.
#if !defined(QT_OPENGL_ES)
extern void Q_QT3D_EXPORT qt_gl_ClientActiveTexture(GLenum texture);
#elif !defined(QT_OPENGL_ES_2)
#define qt_gl_ClientActiveTexture glClientActiveTexture
#endif
class QGLExtensionChecker
{
public:
QGLExtensionChecker(const char *str)
: gl_extensions(str), gl_extensions_length(qstrlen(str))
{}
bool match(const char *str) {
int str_length = qstrlen(str);
const char *extensions = gl_extensions;
int extensions_length = gl_extensions_length;
while (1) {
// the total length that needs to be matched is the str_length +
// the space character that terminates the extension name
if (extensions_length < str_length + 1)
return false;
if (qstrncmp(extensions, str, str_length) == 0 && extensions[str_length] == ' ')
return true;
int split_pos = 0;
while (split_pos < extensions_length && extensions[split_pos] != ' ')
++split_pos;
++split_pos; // added for the terminating space character
extensions += split_pos;
extensions_length -= split_pos;
}
return false;
}
private:
const char *gl_extensions;
int gl_extensions_length;
};
// Copy of some definitions from <QtOpenGL/private/qgl_p.h> so that
// we can avoid a direct dependency upon private headers in Qt.
#if QT_VERSION >= 0x040800
class QGLContextGroup;
#if !defined(QGL_P_H)
class Q_OPENGL_EXPORT QGLContextGroupResourceBase
{
public:
QGLContextGroupResourceBase();
virtual ~QGLContextGroupResourceBase();
void insert(const QGLContext *context, void *value);
void *value(const QGLContext *context);
void cleanup(const QGLContext *context, void *value);
virtual void freeResource(void *value) = 0;
virtual void contextDeleted(const QGLContext *) {}
protected:
QList<QGLContextGroup *> m_groups;
private:
QAtomicInt active;
};
#endif
template <class T>
class QGLResource : public QGLContextGroupResourceBase
{
public:
T *value(const QGLContext *context) {
T *resource = reinterpret_cast<T *>(QGLContextGroupResourceBase::value(context));
if (!resource) {
resource = new T(context);
insert(context, resource);
}
return resource;
}
protected:
void freeResource(void *resource) {
delete reinterpret_cast<T *>(resource);
}
};
#else
#if !defined(QGL_P_H)
class Q_OPENGL_EXPORT QGLContextResource
{
public:
typedef void (*FreeFunc)(void *);
QGLContextResource(FreeFunc f);
~QGLContextResource();
void insert(const QGLContext *key, void *value);
void *value(const QGLContext *key);
void cleanup(const QGLContext *ctx, void *value);
private:
FreeFunc free;
QAtomicInt active;
};
#endif
template <class T>
class QGLResource : public QGLContextResource
{
public:
static void freeResource(void *resource) {
delete reinterpret_cast<T *>(resource);
}
QGLResource() : QGLContextResource(freeResource) {}
T *value(const QGLContext *context) {
T *resource = reinterpret_cast<T *>(QGLContextResource::value(context));
if (!resource) {
resource = new T(context);
insert(context, resource);
}
return resource;
}
};
#endif
#if !defined(QGL_P_H) && !defined(Q_MOC_RUN)
class Q_OPENGL_EXPORT QGLSignalProxy : public QObject
{
Q_OBJECT
public:
QGLSignalProxy() : QObject() {}
void emitAboutToDestroyContext(const QGLContext *context) {
emit aboutToDestroyContext(context);
}
static QGLSignalProxy *instance();
Q_SIGNALS:
void aboutToDestroyContext(const QGLContext *context);
};
#endif
QT_END_NAMESPACE
QT_END_HEADER
#endif
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