Windows-4.7.4/src/opengl/qglextensions.cpp - platform/external/qt - Git at Google

 /****************************************************************************
 **
 ** 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 QtOpenGL 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.
 **
 **
 **
 **
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include "qgl_p.h"

 QT_BEGIN_NAMESPACE

 static void *qt_gl_getProcAddress_search
     (QGLContext *ctx, const char *name1, const char *name2,
      const char *name3, const char *name4)
 {
     void *addr;

     addr = ctx->getProcAddress(QLatin1String(name1));
     if (addr)
         return addr;

     addr = ctx->getProcAddress(QLatin1String(name2));
     if (addr)
         return addr;

     addr = ctx->getProcAddress(QLatin1String(name3));
     if (addr)
         return addr;

     if (name4)
         return ctx->getProcAddress(QLatin1String(name4));

     return 0;
 }

 // Search for an extension function starting with the most likely
 // function suffix first, and then trying the other variations.
 #if defined(QT_OPENGL_ES)
 #define qt_gl_getProcAddress(ctx,name) \
     qt_gl_getProcAddress_search((ctx), name, name "OES", name "EXT", name "ARB")
 #define qt_gl_getProcAddressEXT(ctx,name) \
     qt_gl_getProcAddress_search((ctx), name "OES", name, name "EXT", name "ARB")
 #define qt_gl_getProcAddressARB(ctx,name) \
     qt_gl_getProcAddress_search((ctx), name "OES", name, name "ARB", name "EXT")
 #define qt_gl_getProcAddressOES(ctx,name) \
     qt_gl_getProcAddress_search((ctx), name "OES", name, name "EXT", name "ARB")
 #else
 #define qt_gl_getProcAddress(ctx,name) \
     qt_gl_getProcAddress_search((ctx), name, name "ARB", name "EXT", 0)
 #define qt_gl_getProcAddressEXT(ctx,name) \
     qt_gl_getProcAddress_search((ctx), name "EXT", name, name "ARB", 0)
 #define qt_gl_getProcAddressARB(ctx,name) \
     qt_gl_getProcAddress_search((ctx), name "ARB", name, name "EXT", 0)
 #define qt_gl_getProcAddressOES(ctx,name) \
     qt_gl_getProcAddress_search((ctx), name "OES", name, name "EXT", name "ARB")
 #endif

 bool qt_resolve_framebufferobject_extensions(QGLContext *ctx)
 {
 #if defined(QT_OPENGL_ES_2)
     static bool have_resolved = false;
     if (have_resolved)
         return true;
     have_resolved = true;
 #else
     if (glIsRenderbuffer != 0)
         return true;
 #endif

     if (ctx == 0) {
         qWarning("QGLFramebufferObject: Unable to resolve framebuffer object extensions -"
                  " make sure there is a current context when creating the framebuffer object.");
         return false;
     }


     glBlitFramebufferEXT = (_glBlitFramebufferEXT) qt_gl_getProcAddressEXT(ctx, "glBlitFramebuffer");
     glRenderbufferStorageMultisampleEXT =
         (_glRenderbufferStorageMultisampleEXT) qt_gl_getProcAddressEXT(ctx, "glRenderbufferStorageMultisample");

 #if !defined(QT_OPENGL_ES_2)
     glIsRenderbuffer = (_glIsRenderbuffer) qt_gl_getProcAddressEXT(ctx, "glIsRenderbuffer");
     if (!glIsRenderbuffer)
         return false;   // Not much point searching for anything else.
     glBindRenderbuffer = (_glBindRenderbuffer) qt_gl_getProcAddressEXT(ctx, "glBindRenderbuffer");
     glDeleteRenderbuffers = (_glDeleteRenderbuffers) qt_gl_getProcAddressEXT(ctx, "glDeleteRenderbuffers");
     glGenRenderbuffers = (_glGenRenderbuffers) qt_gl_getProcAddressEXT(ctx, "glGenRenderbuffers");
     glRenderbufferStorage = (_glRenderbufferStorage) qt_gl_getProcAddressEXT(ctx, "glRenderbufferStorage");
     glGetRenderbufferParameteriv =
         (_glGetRenderbufferParameteriv) qt_gl_getProcAddressEXT(ctx, "glGetRenderbufferParameteriv");
     glIsFramebuffer = (_glIsFramebuffer) qt_gl_getProcAddressEXT(ctx, "glIsFramebuffer");
     glBindFramebuffer = (_glBindFramebuffer) qt_gl_getProcAddressEXT(ctx, "glBindFramebuffer");
     glDeleteFramebuffers = (_glDeleteFramebuffers) qt_gl_getProcAddressEXT(ctx, "glDeleteFramebuffers");
     glGenFramebuffers = (_glGenFramebuffers) qt_gl_getProcAddressEXT(ctx, "glGenFramebuffers");
     glCheckFramebufferStatus = (_glCheckFramebufferStatus) qt_gl_getProcAddressEXT(ctx, "glCheckFramebufferStatus");
     glFramebufferTexture2D = (_glFramebufferTexture2D) qt_gl_getProcAddressEXT(ctx, "glFramebufferTexture2D");
     glFramebufferRenderbuffer = (_glFramebufferRenderbuffer) qt_gl_getProcAddressEXT(ctx, "glFramebufferRenderbuffer");
     glGetFramebufferAttachmentParameteriv =
         (_glGetFramebufferAttachmentParameteriv) qt_gl_getProcAddressEXT(ctx, "glGetFramebufferAttachmentParameteriv");
     glGenerateMipmap = (_glGenerateMipmap) qt_gl_getProcAddressEXT(ctx, "glGenerateMipmap");

     return glIsRenderbuffer != 0;
 #else
     return true;
 #endif
 }

 #if !defined(QT_OPENGL_ES_2)
 bool qt_resolve_version_1_3_functions(QGLContext *ctx)
 {
     if (glMultiTexCoord4f != 0)
         return true;

     QGLContext cx(QGLFormat::defaultFormat());
     glMultiTexCoord4f = (_glMultiTexCoord4f) ctx->getProcAddress(QLatin1String("glMultiTexCoord4f"));

     glActiveTexture = (_glActiveTexture) ctx->getProcAddress(QLatin1String("glActiveTexture"));
     return glMultiTexCoord4f && glActiveTexture;
 }
 #endif

 #if !defined(QT_OPENGL_ES_2)
 bool qt_resolve_stencil_face_extension(QGLContext *ctx)
 {
     if (glActiveStencilFaceEXT != 0)
         return true;

     QGLContext cx(QGLFormat::defaultFormat());
     glActiveStencilFaceEXT = (_glActiveStencilFaceEXT) ctx->getProcAddress(QLatin1String("glActiveStencilFaceEXT"));

     return glActiveStencilFaceEXT;
 }
 #endif


 #if !defined(QT_OPENGL_ES_2)
 bool qt_resolve_frag_program_extensions(QGLContext *ctx)
 {
     if (glProgramStringARB != 0)
         return true;

     // ARB_fragment_program
     glProgramStringARB = (_glProgramStringARB) ctx->getProcAddress(QLatin1String("glProgramStringARB"));
     glBindProgramARB = (_glBindProgramARB) ctx->getProcAddress(QLatin1String("glBindProgramARB"));
     glDeleteProgramsARB = (_glDeleteProgramsARB) ctx->getProcAddress(QLatin1String("glDeleteProgramsARB"));
     glGenProgramsARB = (_glGenProgramsARB) ctx->getProcAddress(QLatin1String("glGenProgramsARB"));
     glProgramLocalParameter4fvARB = (_glProgramLocalParameter4fvARB) ctx->getProcAddress(QLatin1String("glProgramLocalParameter4fvARB"));

     return glProgramStringARB
         && glBindProgramARB
         && glDeleteProgramsARB
         && glGenProgramsARB
         && glProgramLocalParameter4fvARB;
 }
 #endif


 bool qt_resolve_buffer_extensions(QGLContext *ctx)
 {
 #if defined(QGL_RESOLVE_BUFFER_FUNCS)
     if (glBindBuffer && glDeleteBuffers && glGenBuffers && glBufferData
             && glBufferSubData && glGetBufferParameteriv)
         return true;
 #endif

 #if defined(QGL_RESOLVE_BUFFER_FUNCS)
     glBindBuffer = (_glBindBuffer) qt_gl_getProcAddressARB(ctx, "glBindBuffer");
     glDeleteBuffers = (_glDeleteBuffers) qt_gl_getProcAddressARB(ctx, "glDeleteBuffers");
     glGenBuffers = (_glGenBuffers) qt_gl_getProcAddressARB(ctx, "glGenBuffers");
     glBufferData = (_glBufferData) qt_gl_getProcAddressARB(ctx, "glBufferData");
     glBufferSubData = (_glBufferSubData) qt_gl_getProcAddressARB(ctx, "glBufferSubData");
     glGetBufferSubData = (_glGetBufferSubData) qt_gl_getProcAddressARB(ctx, "glGetBufferSubData");
     glGetBufferParameteriv = (_glGetBufferParameteriv) qt_gl_getProcAddressARB(ctx, "glGetBufferParameteriv");
 #endif
     glMapBufferARB = (_glMapBufferARB) qt_gl_getProcAddressARB(ctx, "glMapBuffer");
     glUnmapBufferARB = (_glUnmapBufferARB) qt_gl_getProcAddressARB(ctx, "glUnmapBuffer");

 #if defined(QGL_RESOLVE_BUFFER_FUNCS)
     return glBindBuffer
         && glDeleteBuffers
         && glGenBuffers
         && glBufferData
         && glBufferSubData
         && glGetBufferParameteriv;
         // glGetBufferSubData() is optional
 #else
     return true;
 #endif
 }

 #ifndef QT_NO_EGL
 bool qt_resolve_eglimage_gl_extensions(QGLContext *ctx)
 {
     if (glEGLImageTargetTexture2DOES || glEGLImageTargetRenderbufferStorageOES)
         return true;
     glEGLImageTargetTexture2DOES = (_glEGLImageTargetTexture2DOES) ctx->getProcAddress(QLatin1String("glEGLImageTargetTexture2DOES"));
     glEGLImageTargetRenderbufferStorageOES = (_glEGLImageTargetRenderbufferStorageOES) ctx->getProcAddress(QLatin1String("glEGLImageTargetRenderbufferStorageOES"));
     return glEGLImageTargetTexture2DOES && glEGLImageTargetRenderbufferStorageOES;
 }
 #endif

 bool qt_resolve_glsl_extensions(QGLContext *ctx)
 {

 #if defined(QT_OPENGL_ES_2)
     // The GLSL shader functions are always present in OpenGL/ES 2.0.
     // The only exceptions are glGetProgramBinaryOES and glProgramBinaryOES.
     if (!QGLContextPrivate::extensionFuncs(ctx).qt_glslResolved) {
         glGetProgramBinaryOES = (_glGetProgramBinaryOES) ctx->getProcAddress(QLatin1String("glGetProgramBinaryOES"));
         glProgramBinaryOES = (_glProgramBinaryOES) ctx->getProcAddress(QLatin1String("glProgramBinaryOES"));
         QGLContextPrivate::extensionFuncs(ctx).qt_glslResolved = true;
     }
     return true;
 #else
     if (glCreateShader)
         return true;

     // Geometry shaders are optional...
     glProgramParameteriEXT = (_glProgramParameteriEXT) ctx->getProcAddress(QLatin1String("glProgramParameteriEXT"));
     glFramebufferTextureEXT = (_glFramebufferTextureEXT) ctx->getProcAddress(QLatin1String("glFramebufferTextureEXT"));
     glFramebufferTextureLayerEXT = (_glFramebufferTextureLayerEXT) ctx->getProcAddress(QLatin1String("glFramebufferTextureLayerEXT"));
     glFramebufferTextureFaceEXT = (_glFramebufferTextureFaceEXT) ctx->getProcAddress(QLatin1String("glFramebufferTextureFaceEXT"));

     // Must at least have the FragmentShader extension to continue.
     if (!(QGLExtensions::glExtensions() & QGLExtensions::FragmentShader))
         return false;

     glCreateShader = (_glCreateShader) ctx->getProcAddress(QLatin1String("glCreateShader"));
     if (glCreateShader) {
         glShaderSource = (_glShaderSource) ctx->getProcAddress(QLatin1String("glShaderSource"));
         glShaderBinary = (_glShaderBinary) ctx->getProcAddress(QLatin1String("glShaderBinary"));
         glCompileShader = (_glCompileShader) ctx->getProcAddress(QLatin1String("glCompileShader"));
         glDeleteShader = (_glDeleteShader) ctx->getProcAddress(QLatin1String("glDeleteShader"));
         glIsShader = (_glIsShader) ctx->getProcAddress(QLatin1String("glIsShader"));

         glCreateProgram = (_glCreateProgram) ctx->getProcAddress(QLatin1String("glCreateProgram"));
         glAttachShader = (_glAttachShader) ctx->getProcAddress(QLatin1String("glAttachShader"));
         glDetachShader = (_glDetachShader) ctx->getProcAddress(QLatin1String("glDetachShader"));
         glLinkProgram = (_glLinkProgram) ctx->getProcAddress(QLatin1String("glLinkProgram"));
         glUseProgram = (_glUseProgram) ctx->getProcAddress(QLatin1String("glUseProgram"));
         glDeleteProgram = (_glDeleteProgram) ctx->getProcAddress(QLatin1String("glDeleteProgram"));
         glIsProgram = (_glIsProgram) ctx->getProcAddress(QLatin1String("glIsProgram"));

         glGetShaderInfoLog = (_glGetShaderInfoLog) ctx->getProcAddress(QLatin1String("glGetShaderInfoLog"));
         glGetShaderiv = (_glGetShaderiv) ctx->getProcAddress(QLatin1String("glGetShaderiv"));
         glGetShaderSource = (_glGetShaderSource) ctx->getProcAddress(QLatin1String("glGetShaderSource"));
         glGetProgramiv = (_glGetProgramiv) ctx->getProcAddress(QLatin1String("glGetProgramiv"));
         glGetProgramInfoLog = (_glGetProgramInfoLog) ctx->getProcAddress(QLatin1String("glGetProgramInfoLog"));

         glGetUniformLocation = (_glGetUniformLocation) ctx->getProcAddress(QLatin1String("glGetUniformLocation"));
         glUniform4fv = (_glUniform4fv) ctx->getProcAddress(QLatin1String("glUniform4fv"));
         glUniform3fv = (_glUniform3fv) ctx->getProcAddress(QLatin1String("glUniform3fv"));
         glUniform2fv = (_glUniform2fv) ctx->getProcAddress(QLatin1String("glUniform2fv"));
         glUniform1fv = (_glUniform1fv) ctx->getProcAddress(QLatin1String("glUniform1fv"));
         glUniform1i = (_glUniform1i) ctx->getProcAddress(QLatin1String("glUniform1i"));
         glUniform1iv = (_glUniform1iv) ctx->getProcAddress(QLatin1String("glUniform1iv"));
         glUniformMatrix2fv = (_glUniformMatrix2fv) ctx->getProcAddress(QLatin1String("glUniformMatrix2fv"));
         glUniformMatrix3fv = (_glUniformMatrix3fv) ctx->getProcAddress(QLatin1String("glUniformMatrix3fv"));
         glUniformMatrix4fv = (_glUniformMatrix4fv) ctx->getProcAddress(QLatin1String("glUniformMatrix4fv"));
         glUniformMatrix2x3fv = (_glUniformMatrix2x3fv) ctx->getProcAddress(QLatin1String("glUniformMatrix2x3fv"));
         glUniformMatrix2x4fv = (_glUniformMatrix2x4fv) ctx->getProcAddress(QLatin1String("glUniformMatrix2x4fv"));
         glUniformMatrix3x2fv = (_glUniformMatrix3x2fv) ctx->getProcAddress(QLatin1String("glUniformMatrix3x2fv"));
         glUniformMatrix3x4fv = (_glUniformMatrix3x4fv) ctx->getProcAddress(QLatin1String("glUniformMatrix3x4fv"));
         glUniformMatrix4x2fv = (_glUniformMatrix4x2fv) ctx->getProcAddress(QLatin1String("glUniformMatrix4x2fv"));
         glUniformMatrix4x3fv = (_glUniformMatrix4x3fv) ctx->getProcAddress(QLatin1String("glUniformMatrix4x3fv"));

         glBindAttribLocation = (_glBindAttribLocation) ctx->getProcAddress(QLatin1String("glBindAttribLocation"));
         glGetAttribLocation = (_glGetAttribLocation) ctx->getProcAddress(QLatin1String("glGetAttribLocation"));
         glVertexAttrib1fv = (_glVertexAttrib1fv) ctx->getProcAddress(QLatin1String("glVertexAttrib1fv"));
         glVertexAttrib2fv = (_glVertexAttrib2fv) ctx->getProcAddress(QLatin1String("glVertexAttrib2fv"));
         glVertexAttrib3fv = (_glVertexAttrib3fv) ctx->getProcAddress(QLatin1String("glVertexAttrib3fv"));
         glVertexAttrib4fv = (_glVertexAttrib4fv) ctx->getProcAddress(QLatin1String("glVertexAttrib4fv"));
         glVertexAttribPointer = (_glVertexAttribPointer) ctx->getProcAddress(QLatin1String("glVertexAttribPointer"));
         glDisableVertexAttribArray = (_glDisableVertexAttribArray) ctx->getProcAddress(QLatin1String("glDisableVertexAttribArray"));
         glEnableVertexAttribArray = (_glEnableVertexAttribArray) ctx->getProcAddress(QLatin1String("glEnableVertexAttribArray"));

     } else {
         // We may not have the standard shader functions, but we might
         // have the older ARB functions instead.
         glCreateShader = (_glCreateShader) ctx->getProcAddress(QLatin1String("glCreateShaderObjectARB"));
         glShaderSource = (_glShaderSource) ctx->getProcAddress(QLatin1String("glShaderSourceARB"));
         glShaderBinary = (_glShaderBinary) ctx->getProcAddress(QLatin1String("glShaderBinaryARB"));
         glCompileShader = (_glCompileShader) ctx->getProcAddress(QLatin1String("glCompileShaderARB"));
         glDeleteShader = (_glDeleteShader) ctx->getProcAddress(QLatin1String("glDeleteObjectARB"));
         glIsShader = 0;

         glCreateProgram = (_glCreateProgram) ctx->getProcAddress(QLatin1String("glCreateProgramObjectARB"));
         glAttachShader = (_glAttachShader) ctx->getProcAddress(QLatin1String("glAttachObjectARB"));
         glDetachShader = (_glDetachShader) ctx->getProcAddress(QLatin1String("glDetachObjectARB"));
         glLinkProgram = (_glLinkProgram) ctx->getProcAddress(QLatin1String("glLinkProgramARB"));
         glUseProgram = (_glUseProgram) ctx->getProcAddress(QLatin1String("glUseProgramObjectARB"));
         glDeleteProgram = (_glDeleteProgram) ctx->getProcAddress(QLatin1String("glDeleteObjectARB"));
         glIsProgram = 0;

         glGetShaderInfoLog = (_glGetShaderInfoLog) ctx->getProcAddress(QLatin1String("glGetInfoLogARB"));
         glGetShaderiv = (_glGetShaderiv) ctx->getProcAddress(QLatin1String("glGetObjectParameterivARB"));
         glGetShaderSource = (_glGetShaderSource) ctx->getProcAddress(QLatin1String("glGetShaderSourceARB"));
         glGetProgramiv = (_glGetProgramiv) ctx->getProcAddress(QLatin1String("glGetObjectParameterivARB"));
         glGetProgramInfoLog = (_glGetProgramInfoLog) ctx->getProcAddress(QLatin1String("glGetInfoLogARB"));

         glGetUniformLocation = (_glGetUniformLocation) ctx->getProcAddress(QLatin1String("glGetUniformLocationARB"));
         glUniform4fv = (_glUniform4fv) ctx->getProcAddress(QLatin1String("glUniform4fvARB"));
         glUniform3fv = (_glUniform3fv) ctx->getProcAddress(QLatin1String("glUniform3fvARB"));
         glUniform2fv = (_glUniform2fv) ctx->getProcAddress(QLatin1String("glUniform2fvARB"));
         glUniform1fv = (_glUniform1fv) ctx->getProcAddress(QLatin1String("glUniform1fvARB"));
         glUniform1i = (_glUniform1i) ctx->getProcAddress(QLatin1String("glUniform1iARB"));
         glUniform1iv = (_glUniform1iv) ctx->getProcAddress(QLatin1String("glUniform1ivARB"));
         glUniformMatrix2fv = (_glUniformMatrix2fv) ctx->getProcAddress(QLatin1String("glUniformMatrix2fvARB"));
         glUniformMatrix3fv = (_glUniformMatrix3fv) ctx->getProcAddress(QLatin1String("glUniformMatrix3fvARB"));
         glUniformMatrix4fv = (_glUniformMatrix4fv) ctx->getProcAddress(QLatin1String("glUniformMatrix4fvARB"));
         glUniformMatrix2x3fv = (_glUniformMatrix2x3fv) ctx->getProcAddress(QLatin1String("glUniformMatrix2x3fvARB"));
         glUniformMatrix2x4fv = (_glUniformMatrix2x4fv) ctx->getProcAddress(QLatin1String("glUniformMatrix2x4fvARB"));
         glUniformMatrix3x2fv = (_glUniformMatrix3x2fv) ctx->getProcAddress(QLatin1String("glUniformMatrix3x2fvARB"));
         glUniformMatrix3x4fv = (_glUniformMatrix3x4fv) ctx->getProcAddress(QLatin1String("glUniformMatrix3x4fvARB"));
         glUniformMatrix4x2fv = (_glUniformMatrix4x2fv) ctx->getProcAddress(QLatin1String("glUniformMatrix4x2fvARB"));
         glUniformMatrix4x3fv = (_glUniformMatrix4x3fv) ctx->getProcAddress(QLatin1String("glUniformMatrix4x3fvARB"));

         glBindAttribLocation = (_glBindAttribLocation) ctx->getProcAddress(QLatin1String("glBindAttribLocationARB"));
         glGetAttribLocation = (_glGetAttribLocation) ctx->getProcAddress(QLatin1String("glGetAttribLocationARB"));
         glVertexAttrib1fv = (_glVertexAttrib1fv) ctx->getProcAddress(QLatin1String("glVertexAttrib1fvARB"));
         glVertexAttrib2fv = (_glVertexAttrib2fv) ctx->getProcAddress(QLatin1String("glVertexAttrib2fvARB"));
         glVertexAttrib3fv = (_glVertexAttrib3fv) ctx->getProcAddress(QLatin1String("glVertexAttrib3fvARB"));
         glVertexAttrib4fv = (_glVertexAttrib4fv) ctx->getProcAddress(QLatin1String("glVertexAttrib4fvARB"));
         glVertexAttribPointer = (_glVertexAttribPointer) ctx->getProcAddress(QLatin1String("glVertexAttribPointerARB"));
         glDisableVertexAttribArray = (_glDisableVertexAttribArray) ctx->getProcAddress(QLatin1String("glDisableVertexAttribArrayARB"));
         glEnableVertexAttribArray = (_glEnableVertexAttribArray) ctx->getProcAddress(QLatin1String("glEnableVertexAttribArrayARB"));
     }

     // Note: glShaderBinary(), glIsShader(), glIsProgram(), and
     // glUniformMatrixNxMfv() are optional, but all other functions
     // are required.

     return glCreateShader &&
         glShaderSource &&
         glCompileShader &&
         glDeleteProgram &&
         glCreateProgram &&
         glAttachShader &&
         glDetachShader &&
         glLinkProgram &&
         glUseProgram &&
         glDeleteProgram &&
         glGetShaderInfoLog &&
         glGetShaderiv &&
         glGetShaderSource &&
         glGetProgramiv &&
         glGetProgramInfoLog &&
         glGetUniformLocation &&
         glUniform1fv &&
         glUniform2fv &&
         glUniform3fv &&
         glUniform4fv &&
         glUniform1i &&
         glUniform1iv &&
         glUniformMatrix2fv &&
         glUniformMatrix3fv &&
         glUniformMatrix4fv &&
         glBindAttribLocation &&
         glGetAttribLocation &&
         glVertexAttrib1fv &&
         glVertexAttrib2fv &&
         glVertexAttrib3fv &&
         glVertexAttrib4fv &&
         glVertexAttribPointer &&
         glDisableVertexAttribArray &&
         glEnableVertexAttribArray;
 #endif
 }

 #if !defined(QT_OPENGL_ES_2)
 bool qt_resolve_version_2_0_functions(QGLContext *ctx)
 {
     bool gl2supported = true;
     if (!qt_resolve_glsl_extensions(ctx))
         gl2supported = false;

     if (!qt_resolve_version_1_3_functions(ctx))
         gl2supported = false;

     if (!qt_resolve_framebufferobject_extensions(ctx))
         gl2supported = false;

     if (glStencilOpSeparate)
         return gl2supported;

     glBlendColor = (_glBlendColor) ctx->getProcAddress(QLatin1String("glBlendColor"));
     glStencilOpSeparate = (_glStencilOpSeparate) ctx->getProcAddress(QLatin1String("glStencilOpSeparate"));
     if (!glBlendColor || !glStencilOpSeparate)
         gl2supported = false;

     return gl2supported;
 }
 #endif


 QT_END_NAMESPACE
	/****************************************************************************
	**
	** 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 QtOpenGL 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.
	**
	**
	**
	**
	**
	** $QT_END_LICENSE$
	**
	****************************************************************************/

	#include "qgl_p.h"

	QT_BEGIN_NAMESPACE

	static void *qt_gl_getProcAddress_search
	(QGLContext ctx, const char name1, const char *name2,
	const char name3, const char name4)
	{
	void *addr;

	addr = ctx->getProcAddress(QLatin1String(name1));
	if (addr)
	return addr;

	addr = ctx->getProcAddress(QLatin1String(name2));
	if (addr)
	return addr;

	addr = ctx->getProcAddress(QLatin1String(name3));
	if (addr)
	return addr;

	if (name4)
	return ctx->getProcAddress(QLatin1String(name4));

	return 0;
	}

	// Search for an extension function starting with the most likely
	// function suffix first, and then trying the other variations.
	#if defined(QT_OPENGL_ES)
	#define qt_gl_getProcAddress(ctx,name) \
	qt_gl_getProcAddress_search((ctx), name, name "OES", name "EXT", name "ARB")
	#define qt_gl_getProcAddressEXT(ctx,name) \
	qt_gl_getProcAddress_search((ctx), name "OES", name, name "EXT", name "ARB")
	#define qt_gl_getProcAddressARB(ctx,name) \
	qt_gl_getProcAddress_search((ctx), name "OES", name, name "ARB", name "EXT")
	#define qt_gl_getProcAddressOES(ctx,name) \
	qt_gl_getProcAddress_search((ctx), name "OES", name, name "EXT", name "ARB")
	#else
	#define qt_gl_getProcAddress(ctx,name) \
	qt_gl_getProcAddress_search((ctx), name, name "ARB", name "EXT", 0)
	#define qt_gl_getProcAddressEXT(ctx,name) \
	qt_gl_getProcAddress_search((ctx), name "EXT", name, name "ARB", 0)
	#define qt_gl_getProcAddressARB(ctx,name) \
	qt_gl_getProcAddress_search((ctx), name "ARB", name, name "EXT", 0)
	#define qt_gl_getProcAddressOES(ctx,name) \
	qt_gl_getProcAddress_search((ctx), name "OES", name, name "EXT", name "ARB")
	#endif

	bool qt_resolve_framebufferobject_extensions(QGLContext *ctx)
	{
	#if defined(QT_OPENGL_ES_2)
	static bool have_resolved = false;
	if (have_resolved)
	return true;
	have_resolved = true;
	#else
	if (glIsRenderbuffer != 0)
	return true;
	#endif

	if (ctx == 0) {
	qWarning("QGLFramebufferObject: Unable to resolve framebuffer object extensions -"
	" make sure there is a current context when creating the framebuffer object.");
	return false;
	}


	glBlitFramebufferEXT = (_glBlitFramebufferEXT) qt_gl_getProcAddressEXT(ctx, "glBlitFramebuffer");
	glRenderbufferStorageMultisampleEXT =
	(_glRenderbufferStorageMultisampleEXT) qt_gl_getProcAddressEXT(ctx, "glRenderbufferStorageMultisample");

	#if !defined(QT_OPENGL_ES_2)
	glIsRenderbuffer = (_glIsRenderbuffer) qt_gl_getProcAddressEXT(ctx, "glIsRenderbuffer");
	if (!glIsRenderbuffer)
	return false; // Not much point searching for anything else.
	glBindRenderbuffer = (_glBindRenderbuffer) qt_gl_getProcAddressEXT(ctx, "glBindRenderbuffer");
	glDeleteRenderbuffers = (_glDeleteRenderbuffers) qt_gl_getProcAddressEXT(ctx, "glDeleteRenderbuffers");
	glGenRenderbuffers = (_glGenRenderbuffers) qt_gl_getProcAddressEXT(ctx, "glGenRenderbuffers");
	glRenderbufferStorage = (_glRenderbufferStorage) qt_gl_getProcAddressEXT(ctx, "glRenderbufferStorage");
	glGetRenderbufferParameteriv =
	(_glGetRenderbufferParameteriv) qt_gl_getProcAddressEXT(ctx, "glGetRenderbufferParameteriv");
	glIsFramebuffer = (_glIsFramebuffer) qt_gl_getProcAddressEXT(ctx, "glIsFramebuffer");
	glBindFramebuffer = (_glBindFramebuffer) qt_gl_getProcAddressEXT(ctx, "glBindFramebuffer");
	glDeleteFramebuffers = (_glDeleteFramebuffers) qt_gl_getProcAddressEXT(ctx, "glDeleteFramebuffers");
	glGenFramebuffers = (_glGenFramebuffers) qt_gl_getProcAddressEXT(ctx, "glGenFramebuffers");
	glCheckFramebufferStatus = (_glCheckFramebufferStatus) qt_gl_getProcAddressEXT(ctx, "glCheckFramebufferStatus");
	glFramebufferTexture2D = (_glFramebufferTexture2D) qt_gl_getProcAddressEXT(ctx, "glFramebufferTexture2D");
	glFramebufferRenderbuffer = (_glFramebufferRenderbuffer) qt_gl_getProcAddressEXT(ctx, "glFramebufferRenderbuffer");
	glGetFramebufferAttachmentParameteriv =
	(_glGetFramebufferAttachmentParameteriv) qt_gl_getProcAddressEXT(ctx, "glGetFramebufferAttachmentParameteriv");
	glGenerateMipmap = (_glGenerateMipmap) qt_gl_getProcAddressEXT(ctx, "glGenerateMipmap");

	return glIsRenderbuffer != 0;
	#else
	return true;
	#endif
	}

	#if !defined(QT_OPENGL_ES_2)
	bool qt_resolve_version_1_3_functions(QGLContext *ctx)
	{
	if (glMultiTexCoord4f != 0)
	return true;

	QGLContext cx(QGLFormat::defaultFormat());
	glMultiTexCoord4f = (_glMultiTexCoord4f) ctx->getProcAddress(QLatin1String("glMultiTexCoord4f"));

	glActiveTexture = (_glActiveTexture) ctx->getProcAddress(QLatin1String("glActiveTexture"));
	return glMultiTexCoord4f && glActiveTexture;
	}
	#endif

	#if !defined(QT_OPENGL_ES_2)
	bool qt_resolve_stencil_face_extension(QGLContext *ctx)
	{
	if (glActiveStencilFaceEXT != 0)
	return true;

	QGLContext cx(QGLFormat::defaultFormat());
	glActiveStencilFaceEXT = (_glActiveStencilFaceEXT) ctx->getProcAddress(QLatin1String("glActiveStencilFaceEXT"));

	return glActiveStencilFaceEXT;
	}
	#endif


	#if !defined(QT_OPENGL_ES_2)
	bool qt_resolve_frag_program_extensions(QGLContext *ctx)
	{
	if (glProgramStringARB != 0)
	return true;

	// ARB_fragment_program
	glProgramStringARB = (_glProgramStringARB) ctx->getProcAddress(QLatin1String("glProgramStringARB"));
	glBindProgramARB = (_glBindProgramARB) ctx->getProcAddress(QLatin1String("glBindProgramARB"));
	glDeleteProgramsARB = (_glDeleteProgramsARB) ctx->getProcAddress(QLatin1String("glDeleteProgramsARB"));
	glGenProgramsARB = (_glGenProgramsARB) ctx->getProcAddress(QLatin1String("glGenProgramsARB"));
	glProgramLocalParameter4fvARB = (_glProgramLocalParameter4fvARB) ctx->getProcAddress(QLatin1String("glProgramLocalParameter4fvARB"));

	return glProgramStringARB
	&& glBindProgramARB
	&& glDeleteProgramsARB
	&& glGenProgramsARB
	&& glProgramLocalParameter4fvARB;
	}
	#endif


	bool qt_resolve_buffer_extensions(QGLContext *ctx)
	{
	#if defined(QGL_RESOLVE_BUFFER_FUNCS)
	if (glBindBuffer && glDeleteBuffers && glGenBuffers && glBufferData
	&& glBufferSubData && glGetBufferParameteriv)
	return true;
	#endif

	#if defined(QGL_RESOLVE_BUFFER_FUNCS)
	glBindBuffer = (_glBindBuffer) qt_gl_getProcAddressARB(ctx, "glBindBuffer");
	glDeleteBuffers = (_glDeleteBuffers) qt_gl_getProcAddressARB(ctx, "glDeleteBuffers");
	glGenBuffers = (_glGenBuffers) qt_gl_getProcAddressARB(ctx, "glGenBuffers");
	glBufferData = (_glBufferData) qt_gl_getProcAddressARB(ctx, "glBufferData");
	glBufferSubData = (_glBufferSubData) qt_gl_getProcAddressARB(ctx, "glBufferSubData");
	glGetBufferSubData = (_glGetBufferSubData) qt_gl_getProcAddressARB(ctx, "glGetBufferSubData");
	glGetBufferParameteriv = (_glGetBufferParameteriv) qt_gl_getProcAddressARB(ctx, "glGetBufferParameteriv");
	#endif
	glMapBufferARB = (_glMapBufferARB) qt_gl_getProcAddressARB(ctx, "glMapBuffer");
	glUnmapBufferARB = (_glUnmapBufferARB) qt_gl_getProcAddressARB(ctx, "glUnmapBuffer");

	#if defined(QGL_RESOLVE_BUFFER_FUNCS)
	return glBindBuffer
	&& glDeleteBuffers
	&& glGenBuffers
	&& glBufferData
	&& glBufferSubData
	&& glGetBufferParameteriv;
	// glGetBufferSubData() is optional
	#else
	return true;
	#endif
	}

	#ifndef QT_NO_EGL
	bool qt_resolve_eglimage_gl_extensions(QGLContext *ctx)
	{
	if (glEGLImageTargetTexture2DOES \|\| glEGLImageTargetRenderbufferStorageOES)
	return true;
	glEGLImageTargetTexture2DOES = (_glEGLImageTargetTexture2DOES) ctx->getProcAddress(QLatin1String("glEGLImageTargetTexture2DOES"));
	glEGLImageTargetRenderbufferStorageOES = (_glEGLImageTargetRenderbufferStorageOES) ctx->getProcAddress(QLatin1String("glEGLImageTargetRenderbufferStorageOES"));
	return glEGLImageTargetTexture2DOES && glEGLImageTargetRenderbufferStorageOES;
	}
	#endif

	bool qt_resolve_glsl_extensions(QGLContext *ctx)
	{

	#if defined(QT_OPENGL_ES_2)
	// The GLSL shader functions are always present in OpenGL/ES 2.0.
	// The only exceptions are glGetProgramBinaryOES and glProgramBinaryOES.
	if (!QGLContextPrivate::extensionFuncs(ctx).qt_glslResolved) {
	glGetProgramBinaryOES = (_glGetProgramBinaryOES) ctx->getProcAddress(QLatin1String("glGetProgramBinaryOES"));
	glProgramBinaryOES = (_glProgramBinaryOES) ctx->getProcAddress(QLatin1String("glProgramBinaryOES"));
	QGLContextPrivate::extensionFuncs(ctx).qt_glslResolved = true;
	}
	return true;
	#else
	if (glCreateShader)
	return true;

	// Geometry shaders are optional...
	glProgramParameteriEXT = (_glProgramParameteriEXT) ctx->getProcAddress(QLatin1String("glProgramParameteriEXT"));
	glFramebufferTextureEXT = (_glFramebufferTextureEXT) ctx->getProcAddress(QLatin1String("glFramebufferTextureEXT"));
	glFramebufferTextureLayerEXT = (_glFramebufferTextureLayerEXT) ctx->getProcAddress(QLatin1String("glFramebufferTextureLayerEXT"));
	glFramebufferTextureFaceEXT = (_glFramebufferTextureFaceEXT) ctx->getProcAddress(QLatin1String("glFramebufferTextureFaceEXT"));

	// Must at least have the FragmentShader extension to continue.
	if (!(QGLExtensions::glExtensions() & QGLExtensions::FragmentShader))
	return false;

	glCreateShader = (_glCreateShader) ctx->getProcAddress(QLatin1String("glCreateShader"));
	if (glCreateShader) {
	glShaderSource = (_glShaderSource) ctx->getProcAddress(QLatin1String("glShaderSource"));
	glShaderBinary = (_glShaderBinary) ctx->getProcAddress(QLatin1String("glShaderBinary"));
	glCompileShader = (_glCompileShader) ctx->getProcAddress(QLatin1String("glCompileShader"));
	glDeleteShader = (_glDeleteShader) ctx->getProcAddress(QLatin1String("glDeleteShader"));
	glIsShader = (_glIsShader) ctx->getProcAddress(QLatin1String("glIsShader"));

	glCreateProgram = (_glCreateProgram) ctx->getProcAddress(QLatin1String("glCreateProgram"));
	glAttachShader = (_glAttachShader) ctx->getProcAddress(QLatin1String("glAttachShader"));
	glDetachShader = (_glDetachShader) ctx->getProcAddress(QLatin1String("glDetachShader"));
	glLinkProgram = (_glLinkProgram) ctx->getProcAddress(QLatin1String("glLinkProgram"));
	glUseProgram = (_glUseProgram) ctx->getProcAddress(QLatin1String("glUseProgram"));
	glDeleteProgram = (_glDeleteProgram) ctx->getProcAddress(QLatin1String("glDeleteProgram"));
	glIsProgram = (_glIsProgram) ctx->getProcAddress(QLatin1String("glIsProgram"));

	glGetShaderInfoLog = (_glGetShaderInfoLog) ctx->getProcAddress(QLatin1String("glGetShaderInfoLog"));
	glGetShaderiv = (_glGetShaderiv) ctx->getProcAddress(QLatin1String("glGetShaderiv"));
	glGetShaderSource = (_glGetShaderSource) ctx->getProcAddress(QLatin1String("glGetShaderSource"));
	glGetProgramiv = (_glGetProgramiv) ctx->getProcAddress(QLatin1String("glGetProgramiv"));
	glGetProgramInfoLog = (_glGetProgramInfoLog) ctx->getProcAddress(QLatin1String("glGetProgramInfoLog"));

	glGetUniformLocation = (_glGetUniformLocation) ctx->getProcAddress(QLatin1String("glGetUniformLocation"));
	glUniform4fv = (_glUniform4fv) ctx->getProcAddress(QLatin1String("glUniform4fv"));
	glUniform3fv = (_glUniform3fv) ctx->getProcAddress(QLatin1String("glUniform3fv"));
	glUniform2fv = (_glUniform2fv) ctx->getProcAddress(QLatin1String("glUniform2fv"));
	glUniform1fv = (_glUniform1fv) ctx->getProcAddress(QLatin1String("glUniform1fv"));
	glUniform1i = (_glUniform1i) ctx->getProcAddress(QLatin1String("glUniform1i"));
	glUniform1iv = (_glUniform1iv) ctx->getProcAddress(QLatin1String("glUniform1iv"));
	glUniformMatrix2fv = (_glUniformMatrix2fv) ctx->getProcAddress(QLatin1String("glUniformMatrix2fv"));
	glUniformMatrix3fv = (_glUniformMatrix3fv) ctx->getProcAddress(QLatin1String("glUniformMatrix3fv"));
	glUniformMatrix4fv = (_glUniformMatrix4fv) ctx->getProcAddress(QLatin1String("glUniformMatrix4fv"));
	glUniformMatrix2x3fv = (_glUniformMatrix2x3fv) ctx->getProcAddress(QLatin1String("glUniformMatrix2x3fv"));
	glUniformMatrix2x4fv = (_glUniformMatrix2x4fv) ctx->getProcAddress(QLatin1String("glUniformMatrix2x4fv"));
	glUniformMatrix3x2fv = (_glUniformMatrix3x2fv) ctx->getProcAddress(QLatin1String("glUniformMatrix3x2fv"));
	glUniformMatrix3x4fv = (_glUniformMatrix3x4fv) ctx->getProcAddress(QLatin1String("glUniformMatrix3x4fv"));
	glUniformMatrix4x2fv = (_glUniformMatrix4x2fv) ctx->getProcAddress(QLatin1String("glUniformMatrix4x2fv"));
	glUniformMatrix4x3fv = (_glUniformMatrix4x3fv) ctx->getProcAddress(QLatin1String("glUniformMatrix4x3fv"));

	glBindAttribLocation = (_glBindAttribLocation) ctx->getProcAddress(QLatin1String("glBindAttribLocation"));
	glGetAttribLocation = (_glGetAttribLocation) ctx->getProcAddress(QLatin1String("glGetAttribLocation"));
	glVertexAttrib1fv = (_glVertexAttrib1fv) ctx->getProcAddress(QLatin1String("glVertexAttrib1fv"));
	glVertexAttrib2fv = (_glVertexAttrib2fv) ctx->getProcAddress(QLatin1String("glVertexAttrib2fv"));
	glVertexAttrib3fv = (_glVertexAttrib3fv) ctx->getProcAddress(QLatin1String("glVertexAttrib3fv"));
	glVertexAttrib4fv = (_glVertexAttrib4fv) ctx->getProcAddress(QLatin1String("glVertexAttrib4fv"));
	glVertexAttribPointer = (_glVertexAttribPointer) ctx->getProcAddress(QLatin1String("glVertexAttribPointer"));
	glDisableVertexAttribArray = (_glDisableVertexAttribArray) ctx->getProcAddress(QLatin1String("glDisableVertexAttribArray"));
	glEnableVertexAttribArray = (_glEnableVertexAttribArray) ctx->getProcAddress(QLatin1String("glEnableVertexAttribArray"));

	} else {
	// We may not have the standard shader functions, but we might
	// have the older ARB functions instead.
	glCreateShader = (_glCreateShader) ctx->getProcAddress(QLatin1String("glCreateShaderObjectARB"));
	glShaderSource = (_glShaderSource) ctx->getProcAddress(QLatin1String("glShaderSourceARB"));
	glShaderBinary = (_glShaderBinary) ctx->getProcAddress(QLatin1String("glShaderBinaryARB"));
	glCompileShader = (_glCompileShader) ctx->getProcAddress(QLatin1String("glCompileShaderARB"));
	glDeleteShader = (_glDeleteShader) ctx->getProcAddress(QLatin1String("glDeleteObjectARB"));
	glIsShader = 0;

	glCreateProgram = (_glCreateProgram) ctx->getProcAddress(QLatin1String("glCreateProgramObjectARB"));
	glAttachShader = (_glAttachShader) ctx->getProcAddress(QLatin1String("glAttachObjectARB"));
	glDetachShader = (_glDetachShader) ctx->getProcAddress(QLatin1String("glDetachObjectARB"));
	glLinkProgram = (_glLinkProgram) ctx->getProcAddress(QLatin1String("glLinkProgramARB"));
	glUseProgram = (_glUseProgram) ctx->getProcAddress(QLatin1String("glUseProgramObjectARB"));
	glDeleteProgram = (_glDeleteProgram) ctx->getProcAddress(QLatin1String("glDeleteObjectARB"));
	glIsProgram = 0;

	glGetShaderInfoLog = (_glGetShaderInfoLog) ctx->getProcAddress(QLatin1String("glGetInfoLogARB"));
	glGetShaderiv = (_glGetShaderiv) ctx->getProcAddress(QLatin1String("glGetObjectParameterivARB"));
	glGetShaderSource = (_glGetShaderSource) ctx->getProcAddress(QLatin1String("glGetShaderSourceARB"));
	glGetProgramiv = (_glGetProgramiv) ctx->getProcAddress(QLatin1String("glGetObjectParameterivARB"));
	glGetProgramInfoLog = (_glGetProgramInfoLog) ctx->getProcAddress(QLatin1String("glGetInfoLogARB"));

	glGetUniformLocation = (_glGetUniformLocation) ctx->getProcAddress(QLatin1String("glGetUniformLocationARB"));
	glUniform4fv = (_glUniform4fv) ctx->getProcAddress(QLatin1String("glUniform4fvARB"));
	glUniform3fv = (_glUniform3fv) ctx->getProcAddress(QLatin1String("glUniform3fvARB"));
	glUniform2fv = (_glUniform2fv) ctx->getProcAddress(QLatin1String("glUniform2fvARB"));
	glUniform1fv = (_glUniform1fv) ctx->getProcAddress(QLatin1String("glUniform1fvARB"));
	glUniform1i = (_glUniform1i) ctx->getProcAddress(QLatin1String("glUniform1iARB"));
	glUniform1iv = (_glUniform1iv) ctx->getProcAddress(QLatin1String("glUniform1ivARB"));
	glUniformMatrix2fv = (_glUniformMatrix2fv) ctx->getProcAddress(QLatin1String("glUniformMatrix2fvARB"));
	glUniformMatrix3fv = (_glUniformMatrix3fv) ctx->getProcAddress(QLatin1String("glUniformMatrix3fvARB"));
	glUniformMatrix4fv = (_glUniformMatrix4fv) ctx->getProcAddress(QLatin1String("glUniformMatrix4fvARB"));
	glUniformMatrix2x3fv = (_glUniformMatrix2x3fv) ctx->getProcAddress(QLatin1String("glUniformMatrix2x3fvARB"));
	glUniformMatrix2x4fv = (_glUniformMatrix2x4fv) ctx->getProcAddress(QLatin1String("glUniformMatrix2x4fvARB"));
	glUniformMatrix3x2fv = (_glUniformMatrix3x2fv) ctx->getProcAddress(QLatin1String("glUniformMatrix3x2fvARB"));
	glUniformMatrix3x4fv = (_glUniformMatrix3x4fv) ctx->getProcAddress(QLatin1String("glUniformMatrix3x4fvARB"));
	glUniformMatrix4x2fv = (_glUniformMatrix4x2fv) ctx->getProcAddress(QLatin1String("glUniformMatrix4x2fvARB"));
	glUniformMatrix4x3fv = (_glUniformMatrix4x3fv) ctx->getProcAddress(QLatin1String("glUniformMatrix4x3fvARB"));

	glBindAttribLocation = (_glBindAttribLocation) ctx->getProcAddress(QLatin1String("glBindAttribLocationARB"));
	glGetAttribLocation = (_glGetAttribLocation) ctx->getProcAddress(QLatin1String("glGetAttribLocationARB"));
	glVertexAttrib1fv = (_glVertexAttrib1fv) ctx->getProcAddress(QLatin1String("glVertexAttrib1fvARB"));
	glVertexAttrib2fv = (_glVertexAttrib2fv) ctx->getProcAddress(QLatin1String("glVertexAttrib2fvARB"));
	glVertexAttrib3fv = (_glVertexAttrib3fv) ctx->getProcAddress(QLatin1String("glVertexAttrib3fvARB"));
	glVertexAttrib4fv = (_glVertexAttrib4fv) ctx->getProcAddress(QLatin1String("glVertexAttrib4fvARB"));
	glVertexAttribPointer = (_glVertexAttribPointer) ctx->getProcAddress(QLatin1String("glVertexAttribPointerARB"));
	glDisableVertexAttribArray = (_glDisableVertexAttribArray) ctx->getProcAddress(QLatin1String("glDisableVertexAttribArrayARB"));
	glEnableVertexAttribArray = (_glEnableVertexAttribArray) ctx->getProcAddress(QLatin1String("glEnableVertexAttribArrayARB"));
	}

	// Note: glShaderBinary(), glIsShader(), glIsProgram(), and
	// glUniformMatrixNxMfv() are optional, but all other functions
	// are required.

	return glCreateShader &&
	glShaderSource &&
	glCompileShader &&
	glDeleteProgram &&
	glCreateProgram &&
	glAttachShader &&
	glDetachShader &&
	glLinkProgram &&
	glUseProgram &&
	glDeleteProgram &&
	glGetShaderInfoLog &&
	glGetShaderiv &&
	glGetShaderSource &&
	glGetProgramiv &&
	glGetProgramInfoLog &&
	glGetUniformLocation &&
	glUniform1fv &&
	glUniform2fv &&
	glUniform3fv &&
	glUniform4fv &&
	glUniform1i &&
	glUniform1iv &&
	glUniformMatrix2fv &&
	glUniformMatrix3fv &&
	glUniformMatrix4fv &&
	glBindAttribLocation &&
	glGetAttribLocation &&
	glVertexAttrib1fv &&
	glVertexAttrib2fv &&
	glVertexAttrib3fv &&
	glVertexAttrib4fv &&
	glVertexAttribPointer &&
	glDisableVertexAttribArray &&
	glEnableVertexAttribArray;
	#endif
	}

	#if !defined(QT_OPENGL_ES_2)
	bool qt_resolve_version_2_0_functions(QGLContext *ctx)
	{
	bool gl2supported = true;
	if (!qt_resolve_glsl_extensions(ctx))
	gl2supported = false;

	if (!qt_resolve_version_1_3_functions(ctx))
	gl2supported = false;

	if (!qt_resolve_framebufferobject_extensions(ctx))
	gl2supported = false;

	if (glStencilOpSeparate)
	return gl2supported;

	glBlendColor = (_glBlendColor) ctx->getProcAddress(QLatin1String("glBlendColor"));
	glStencilOpSeparate = (_glStencilOpSeparate) ctx->getProcAddress(QLatin1String("glStencilOpSeparate"));
	if (!glBlendColor \|\| !glStencilOpSeparate)
	gl2supported = false;

	return gl2supported;
	}
	#endif


	QT_END_NAMESPACE