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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtGui 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qopengl.h"
#include "qopengl_p.h"
#include "qopenglcontext.h"
#include "qopenglfunctions.h"
QT_BEGIN_NAMESPACE
#if defined(QT_OPENGL_3)
typedef const GLubyte * (QOPENGLF_APIENTRYP qt_glGetStringi)(GLenum, GLuint);
#endif
QOpenGLExtensionMatcher::QOpenGLExtensionMatcher()
{
QOpenGLContext *ctx = QOpenGLContext::currentContext();
QOpenGLFunctions *funcs = ctx->functions();
const char *extensionStr = 0;
if (ctx->isOpenGLES() || ctx->format().majorVersion() < 3)
extensionStr = reinterpret_cast<const char *>(funcs->glGetString(GL_EXTENSIONS));
if (extensionStr) {
QByteArray ba(extensionStr);
QList<QByteArray> extensions = ba.split(' ');
m_extensions = extensions.toSet();
} else {
#ifdef QT_OPENGL_3
// clear error state
while (funcs->glGetError()) {}
if (ctx) {
qt_glGetStringi glGetStringi = (qt_glGetStringi)ctx->getProcAddress("glGetStringi");
if (!glGetStringi)
return;
GLint numExtensions;
funcs->glGetIntegerv(GL_NUM_EXTENSIONS, &numExtensions);
for (int i = 0; i < numExtensions; ++i) {
const char *str = reinterpret_cast<const char *>(glGetStringi(GL_EXTENSIONS, i));
m_extensions.insert(str);
}
}
#endif // QT_OPENGL_3
}
}
QT_END_NAMESPACE
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