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

# glextensions.h Example File

graphicsview/boxes/glextensions.h

    /****************************************************************************
    **
    ** 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.
    **
    ** 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 GLEXTENSIONS_H
    #define GLEXTENSIONS_H

    #include <QtOpenGL>

    /*
    Functions resolved:

    glGenFramebuffersEXT
    glGenRenderbuffersEXT
    glBindRenderbufferEXT
    glRenderbufferStorageEXT
    glDeleteFramebuffersEXT
    glDeleteRenderbuffersEXT
    glBindFramebufferEXT
    glFramebufferTexture2DEXT
    glFramebufferRenderbufferEXT
    glCheckFramebufferStatusEXT

    glActiveTexture
    glTexImage3D

    glGenBuffers
    glBindBuffer
    glBufferData
    glDeleteBuffers
    glMapBuffer
    glUnmapBuffer
    */

    #ifndef Q_OS_MAC
    # ifndef APIENTRYP
    #   ifdef APIENTRY
    #     define APIENTRYP APIENTRY *
    #   else
    #     define APIENTRY
    #     define APIENTRYP *
    #   endif
    # endif
    #else
    # define APIENTRY
    # define APIENTRYP *
    #endif

    #ifndef GL_VERSION_1_2
    #define GL_TEXTURE_3D 0x806F
    #define GL_TEXTURE_WRAP_R 0x8072
    #define GL_CLAMP_TO_EDGE 0x812F
    #define GL_BGRA 0x80E1
    #endif

    #ifndef GL_VERSION_1_3
    #define GL_TEXTURE0 0x84C0
    #define GL_TEXTURE1 0x84C1
    #define GL_TEXTURE2 0x84C2
    #define GL_TEXTURE_CUBE_MAP 0x8513
    #define GL_TEXTURE_CUBE_MAP_POSITIVE_X 0x8515
    //#define GL_TEXTURE_CUBE_MAP_NEGATIVE_X 0x8516
    //#define GL_TEXTURE_CUBE_MAP_POSITIVE_Y 0x8517
    //#define GL_TEXTURE_CUBE_MAP_NEGATIVE_Y 0x8518
    //#define GL_TEXTURE_CUBE_MAP_POSITIVE_Z 0x8519
    //#define GL_TEXTURE_CUBE_MAP_NEGATIVE_Z 0x851A
    #endif

    #ifndef GL_ARB_vertex_buffer_object
    typedef ptrdiff_t GLsizeiptrARB;
    #endif

    #ifndef GL_VERSION_1_5
    #define GL_ARRAY_BUFFER 0x8892
    #define GL_ELEMENT_ARRAY_BUFFER 0x8893
    #define GL_READ_WRITE 0x88BA
    #define GL_STATIC_DRAW 0x88E4
    #endif

    #ifndef GL_EXT_framebuffer_object
    #define GL_RENDERBUFFER_EXT 0x8D41
    #define GL_FRAMEBUFFER_EXT 0x8D40
    #define GL_FRAMEBUFFER_COMPLETE_EXT 0x8CD5
    #define GL_COLOR_ATTACHMENT0_EXT 0x8CE0
    #define GL_DEPTH_ATTACHMENT_EXT 0x8D00
    #endif

    typedef void (APIENTRY *_glGenFramebuffersEXT) (GLsizei, GLuint *);
    typedef void (APIENTRY *_glGenRenderbuffersEXT) (GLsizei, GLuint *);
    typedef void (APIENTRY *_glBindRenderbufferEXT) (GLenum, GLuint);
    typedef void (APIENTRY *_glRenderbufferStorageEXT) (GLenum, GLenum, GLsizei, GLsizei);
    typedef void (APIENTRY *_glDeleteFramebuffersEXT) (GLsizei, const GLuint*);
    typedef void (APIENTRY *_glDeleteRenderbuffersEXT) (GLsizei, const GLuint*);
    typedef void (APIENTRY *_glBindFramebufferEXT) (GLenum, GLuint);
    typedef void (APIENTRY *_glFramebufferTexture2DEXT) (GLenum, GLenum, GLenum, GLuint, GLint);
    typedef void (APIENTRY *_glFramebufferRenderbufferEXT) (GLenum, GLenum, GLenum, GLuint);
    typedef GLenum (APIENTRY *_glCheckFramebufferStatusEXT) (GLenum);

    typedef void (APIENTRY *_glActiveTexture) (GLenum);
    typedef void (APIENTRY *_glTexImage3D) (GLenum, GLint, GLenum, GLsizei, GLsizei, GLsizei, GLint, GLenum, GLenum, const GLvoid *);

    typedef void (APIENTRY *_glGenBuffers) (GLsizei, GLuint *);
    typedef void (APIENTRY *_glBindBuffer) (GLenum, GLuint);
    typedef void (APIENTRY *_glBufferData) (GLenum, GLsizeiptrARB, const GLvoid *, GLenum);
    typedef void (APIENTRY *_glDeleteBuffers) (GLsizei, const GLuint *);
    typedef void *(APIENTRY *_glMapBuffer) (GLenum, GLenum);
    typedef GLboolean (APIENTRY *_glUnmapBuffer) (GLenum);

    struct GLExtensionFunctions
    {
        bool resolve(const QGLContext *context);

        bool fboSupported();
        bool openGL15Supported(); // the rest: multi-texture, 3D-texture, vertex buffer objects

        _glGenFramebuffersEXT GenFramebuffersEXT;
        _glGenRenderbuffersEXT GenRenderbuffersEXT;
        _glBindRenderbufferEXT BindRenderbufferEXT;
        _glRenderbufferStorageEXT RenderbufferStorageEXT;
        _glDeleteFramebuffersEXT DeleteFramebuffersEXT;
        _glDeleteRenderbuffersEXT DeleteRenderbuffersEXT;
        _glBindFramebufferEXT BindFramebufferEXT;
        _glFramebufferTexture2DEXT FramebufferTexture2DEXT;
        _glFramebufferRenderbufferEXT FramebufferRenderbufferEXT;
        _glCheckFramebufferStatusEXT CheckFramebufferStatusEXT;

        _glActiveTexture ActiveTexture;
        _glTexImage3D TexImage3D;

        _glGenBuffers GenBuffers;
        _glBindBuffer BindBuffer;
        _glBufferData BufferData;
        _glDeleteBuffers DeleteBuffers;
        _glMapBuffer MapBuffer;
        _glUnmapBuffer UnmapBuffer;
    };

    inline GLExtensionFunctions &getGLExtensionFunctions()
    {
        static GLExtensionFunctions funcs;
        return funcs;
    }

    #define glGenFramebuffersEXT getGLExtensionFunctions().GenFramebuffersEXT
    #define glGenRenderbuffersEXT getGLExtensionFunctions().GenRenderbuffersEXT
    #define glBindRenderbufferEXT getGLExtensionFunctions().BindRenderbufferEXT
    #define glRenderbufferStorageEXT getGLExtensionFunctions().RenderbufferStorageEXT
    #define glDeleteFramebuffersEXT getGLExtensionFunctions().DeleteFramebuffersEXT
    #define glDeleteRenderbuffersEXT getGLExtensionFunctions().DeleteRenderbuffersEXT
    #define glBindFramebufferEXT getGLExtensionFunctions().BindFramebufferEXT
    #define glFramebufferTexture2DEXT getGLExtensionFunctions().FramebufferTexture2DEXT
    #define glFramebufferRenderbufferEXT getGLExtensionFunctions().FramebufferRenderbufferEXT
    #define glCheckFramebufferStatusEXT getGLExtensionFunctions().CheckFramebufferStatusEXT

    #define glActiveTexture getGLExtensionFunctions().ActiveTexture
    #define glTexImage3D getGLExtensionFunctions().TexImage3D

    #define glGenBuffers getGLExtensionFunctions().GenBuffers
    #define glBindBuffer getGLExtensionFunctions().BindBuffer
    #define glBufferData getGLExtensionFunctions().BufferData
    #define glDeleteBuffers getGLExtensionFunctions().DeleteBuffers
    #define glMapBuffer getGLExtensionFunctions().MapBuffer
    #define glUnmapBuffer getGLExtensionFunctions().UnmapBuffer

    #endif