- Qt 5.5
- Qt Widgets
- Boxes
- glextensions.cpp Example File
- Qt 5.5.1 Reference Documentation

# glextensions.cpp Example File

graphicsview/boxes/glextensions.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the demonstration applications 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.
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    ** As a special exception, The Qt Company gives you certain additional
    ** rights. These rights are described in The Qt Company LGPL Exception
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    ** $QT_END_LICENSE$
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    ****************************************************************************/

    #include "glextensions.h"

    #define RESOLVE_GL_FUNC(f) ok &= bool((f = (_gl##f) context->getProcAddress(QLatin1String("gl" #f))));

    bool GLExtensionFunctions::resolve(const QGLContext *context)
    {
        bool ok = true;

        RESOLVE_GL_FUNC(GenFramebuffersEXT)
        RESOLVE_GL_FUNC(GenRenderbuffersEXT)
        RESOLVE_GL_FUNC(BindRenderbufferEXT)
        RESOLVE_GL_FUNC(RenderbufferStorageEXT)
        RESOLVE_GL_FUNC(DeleteFramebuffersEXT)
        RESOLVE_GL_FUNC(DeleteRenderbuffersEXT)
        RESOLVE_GL_FUNC(BindFramebufferEXT)
        RESOLVE_GL_FUNC(FramebufferTexture2DEXT)
        RESOLVE_GL_FUNC(FramebufferRenderbufferEXT)
        RESOLVE_GL_FUNC(CheckFramebufferStatusEXT)

        RESOLVE_GL_FUNC(ActiveTexture)
        RESOLVE_GL_FUNC(TexImage3D)

        RESOLVE_GL_FUNC(GenBuffers)
        RESOLVE_GL_FUNC(BindBuffer)
        RESOLVE_GL_FUNC(BufferData)
        RESOLVE_GL_FUNC(DeleteBuffers)
        RESOLVE_GL_FUNC(MapBuffer)
        RESOLVE_GL_FUNC(UnmapBuffer)

        return ok;
    }

    bool GLExtensionFunctions::fboSupported() {
        return GenFramebuffersEXT
                && GenRenderbuffersEXT
                && BindRenderbufferEXT
                && RenderbufferStorageEXT
                && DeleteFramebuffersEXT
                && DeleteRenderbuffersEXT
                && BindFramebufferEXT
                && FramebufferTexture2DEXT
                && FramebufferRenderbufferEXT
                && CheckFramebufferStatusEXT;
    }

    bool GLExtensionFunctions::openGL15Supported() {
        return ActiveTexture
                && TexImage3D
                && GenBuffers
                && BindBuffer
                && BufferData
                && DeleteBuffers
                && MapBuffer
                && UnmapBuffer;
    }

    #undef RESOLVE_GL_FUNC