Long live Qt!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the demonstration applications of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 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 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef GLEXTENSIONS_H
+#define GLEXTENSIONS_H
+
+#include <QtOpenGL>
+
+/*
+Functions resolved:
+
+glCreateShaderObjectARB
+glShaderSourceARB
+glCompileShaderARB
+glGetObjectParameterivARB
+glDeleteObjectARB
+glGetInfoLogARB
+glCreateProgramObjectARB
+glAttachObjectARB
+glDetachObjectARB
+glLinkProgramARB
+glUseProgramObjectARB
+glGetUniformLocationARB
+glUniform1iARB
+glUniform1fARB
+glUniform4fARB
+glUniformMatrix4fvARB
+
+glGenFramebuffersEXT
+glGenRenderbuffersEXT
+glBindRenderbufferEXT
+glRenderbufferStorageEXT
+glDeleteFramebuffersEXT
+glDeleteRenderbuffersEXT
+glBindFramebufferEXT
+glFramebufferTexture2DEXT
+glFramebufferRenderbufferEXT
+glCheckFramebufferStatusEXT
+
+glActiveTexture
+glTexImage3D
+
+glGenBuffers
+glBindBuffer
+glBufferData
+glDeleteBuffers
+glMapBuffer
+glUnmapBuffer
+*/
+
+#ifndef Q_WS_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_VERSION_1_5
+typedef ptrdiff_t GLsizeiptr;
+#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
+
+#ifndef GL_ARB_vertex_shader
+#define GL_VERTEX_SHADER_ARB 0x8B31
+#endif
+
+#ifndef GL_ARB_fragment_shader
+#define GL_FRAGMENT_SHADER_ARB 0x8B30
+#endif
+
+#ifndef GL_ARB_shader_objects
+typedef char GLcharARB;
+typedef unsigned int GLhandleARB;
+#define GL_OBJECT_COMPILE_STATUS_ARB 0x8B81
+#define GL_OBJECT_LINK_STATUS_ARB 0x8B82
+#define GL_OBJECT_INFO_LOG_LENGTH_ARB 0x8B84
+#endif
+
+typedef GLhandleARB (APIENTRY *_glCreateShaderObjectARB) (GLenum);
+typedef void (APIENTRY *_glShaderSourceARB) (GLhandleARB, GLuint, const GLcharARB**, GLint *);
+typedef void (APIENTRY *_glCompileShaderARB) (GLhandleARB);
+typedef void (APIENTRY *_glGetObjectParameterivARB) (GLhandleARB, GLenum, int *);
+typedef void (APIENTRY *_glDeleteObjectARB) (GLhandleARB);
+typedef void (APIENTRY *_glGetInfoLogARB) (GLhandleARB, GLsizei, GLsizei *, GLcharARB *);
+typedef GLhandleARB (APIENTRY *_glCreateProgramObjectARB) ();
+typedef void (APIENTRY *_glAttachObjectARB) (GLhandleARB, GLhandleARB);
+typedef void (APIENTRY *_glDetachObjectARB) (GLhandleARB, GLhandleARB);
+typedef void (APIENTRY *_glLinkProgramARB) (GLhandleARB);
+typedef void (APIENTRY *_glUseProgramObjectARB) (GLhandleARB);
+typedef GLint (APIENTRY *_glGetUniformLocationARB) (GLhandleARB, const GLcharARB *);
+typedef void (APIENTRY *_glUniform1iARB) (GLint, GLint);
+typedef void (APIENTRY *_glUniform1fARB) (GLint, GLfloat);
+typedef void (APIENTRY *_glUniform4fARB) (GLint, GLfloat, GLfloat, GLfloat, GLfloat);
+typedef void (APIENTRY *_glUniformMatrix4fvARB) (GLint, GLuint, GLboolean, const GLfloat *);
+
+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, GLsizeiptr, 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 glslSupported();
+    bool fboSupported();
+    bool openGL15Supported(); // the rest: multi-texture, 3D-texture, vertex buffer objects
+
+	_glCreateShaderObjectARB CreateShaderObjectARB;
+	_glShaderSourceARB ShaderSourceARB;
+	_glCompileShaderARB CompileShaderARB;
+	_glGetObjectParameterivARB GetObjectParameterivARB;
+	_glDeleteObjectARB DeleteObjectARB;
+	_glGetInfoLogARB GetInfoLogARB;
+	_glCreateProgramObjectARB CreateProgramObjectARB;
+	_glAttachObjectARB AttachObjectARB;
+	_glDetachObjectARB DetachObjectARB;
+	_glLinkProgramARB LinkProgramARB;
+	_glUseProgramObjectARB UseProgramObjectARB;
+	_glGetUniformLocationARB GetUniformLocationARB;
+	_glUniform1iARB Uniform1iARB;
+	_glUniform1fARB Uniform1fARB;
+	_glUniform4fARB Uniform4fARB;
+	_glUniformMatrix4fvARB UniformMatrix4fvARB;
+
+	_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 glCreateShaderObjectARB getGLExtensionFunctions().CreateShaderObjectARB
+#define glShaderSourceARB getGLExtensionFunctions().ShaderSourceARB
+#define glCompileShaderARB getGLExtensionFunctions().CompileShaderARB
+#define glGetObjectParameterivARB getGLExtensionFunctions().GetObjectParameterivARB
+#define glDeleteObjectARB getGLExtensionFunctions().DeleteObjectARB
+#define glGetInfoLogARB getGLExtensionFunctions().GetInfoLogARB
+#define glCreateProgramObjectARB getGLExtensionFunctions().CreateProgramObjectARB
+#define glAttachObjectARB getGLExtensionFunctions().AttachObjectARB
+#define glDetachObjectARB getGLExtensionFunctions().DetachObjectARB
+#define glLinkProgramARB getGLExtensionFunctions().LinkProgramARB
+#define glUseProgramObjectARB getGLExtensionFunctions().UseProgramObjectARB
+#define glGetUniformLocationARB getGLExtensionFunctions().GetUniformLocationARB
+#define glUniform1iARB getGLExtensionFunctions().Uniform1iARB
+#define glUniform1fARB getGLExtensionFunctions().Uniform1fARB
+#define glUniform4fARB getGLExtensionFunctions().Uniform4fARB
+#define glUniformMatrix4fvARB getGLExtensionFunctions().UniformMatrix4fvARB
+
+#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