diff --git a/src/osg/BlendColor.cpp b/src/osg/BlendColor.cpp
index e4347e613..f821cb841 100644
--- a/src/osg/BlendColor.cpp
+++ b/src/osg/BlendColor.cpp
@@ -89,7 +89,8 @@ void BlendColor::Extensions::lowestCommonDenominator(const Extensions& rhs)
 
 void BlendColor::Extensions::setupGLExtensions(unsigned int contextID)
 {
-    _isBlendColorSupported = isGLExtensionSupported(contextID,"GL_EXT_blend_color") ||
+    _isBlendColorSupported = OSG_GLES2_FEATURES || OSG_GL3_FEATURES ||
+                             isGLExtensionSupported(contextID,"GL_EXT_blend_color") ||
                              strncmp((const char*)glGetString(GL_VERSION),"1.2",3)>=0;
 
     setGLExtensionFuncPtr(_glBlendColor, "glBlendColor", "glBlendColorEXT");
diff --git a/src/osg/BlendEquation.cpp b/src/osg/BlendEquation.cpp
index 817070a94..99a188173 100644
--- a/src/osg/BlendEquation.cpp
+++ b/src/osg/BlendEquation.cpp
@@ -124,10 +124,13 @@ void BlendEquation::Extensions::lowestCommonDenominator(const Extensions& rhs)
 
 void BlendEquation::Extensions::setupGLExtensions(unsigned int contextID)
 {
-    _isBlendEquationSupported = isGLExtensionSupported(contextID, "GL_EXT_blend_equation") || 
+    bool bultInSupport = OSG_GLES2_FEATURES || OSG_GL3_FEATURES;
+    _isBlendEquationSupported = bultInSupport || 
+        isGLExtensionSupported(contextID, "GL_EXT_blend_equation") || 
         strncmp((const char*)glGetString(GL_VERSION), "1.2", 3) >= 0;
 
-    _isBlendEquationSeparateSupported = isGLExtensionSupported(contextID, "GL_EXT_blend_equation_separate") || 
+    _isBlendEquationSeparateSupported = bultInSupport ||
+        isGLExtensionSupported(contextID, "GL_EXT_blend_equation_separate") || 
         strncmp((const char*)glGetString(GL_VERSION), "2.0", 3) >= 0;
 
     _isSGIXMinMaxSupported = isGLExtensionSupported(contextID, "GL_SGIX_blend_alpha_minmax");
diff --git a/src/osg/BlendFunc.cpp b/src/osg/BlendFunc.cpp
index 7ffa5e185..8b568a6ae 100644
--- a/src/osg/BlendFunc.cpp
+++ b/src/osg/BlendFunc.cpp
@@ -106,8 +106,9 @@ void BlendFunc::Extensions::lowestCommonDenominator(const Extensions& rhs)
 
 void BlendFunc::Extensions::setupGLExtensions(unsigned int contextID)
 {
-    _isBlendFuncSeparateSupported = isGLExtensionSupported(contextID, "GL_EXT_blend_func_separate") ||
-        strncmp((const char*)glGetString(GL_VERSION), "1.4", 3) >= 0;
+    _isBlendFuncSeparateSupported = OSG_GLES2_FEATURES || OSG_GL3_FEATURES ||
+                                    isGLExtensionSupported(contextID, "GL_EXT_blend_func_separate") ||
+                                    strncmp((const char*)glGetString(GL_VERSION), "1.4", 3) >= 0;
 
      setGLExtensionFuncPtr(_glBlendFuncSeparate, "glBlendFuncSeparate", "glBlendFuncSeparateEXT");
 }
diff --git a/src/osg/BufferObject.cpp b/src/osg/BufferObject.cpp
index 7651aacc1..adc8bcf7e 100644
--- a/src/osg/BufferObject.cpp
+++ b/src/osg/BufferObject.cpp
@@ -348,7 +348,7 @@ void GLBufferObject::Extensions::setupGLExtensions(unsigned int contextID)
     setGLExtensionFuncPtr(_glUnmapBuffer, "glUnmapBuffer","glUnmapBufferARB");
     setGLExtensionFuncPtr(_glGetBufferParameteriv, "glGetBufferParameteriv","glGetBufferParameterivARB");
     setGLExtensionFuncPtr(_glGetBufferPointerv, "glGetBufferPointerv","glGetBufferPointervARB");
-    _isPBOSupported = osg::isGLExtensionSupported(contextID,"GL_ARB_pixel_buffer_object");
+    _isPBOSupported = OSG_GL3_FEATURES || osg::isGLExtensionSupported(contextID,"GL_ARB_pixel_buffer_object");
 }
 
 void GLBufferObject::Extensions::glGenBuffers(GLsizei n, GLuint *buffers) const
diff --git a/src/osg/ClampColor.cpp b/src/osg/ClampColor.cpp
index 281713fd6..9f2269243 100644
--- a/src/osg/ClampColor.cpp
+++ b/src/osg/ClampColor.cpp
@@ -93,7 +93,8 @@ void ClampColor::Extensions::lowestCommonDenominator(const Extensions& rhs)
 
 void ClampColor::Extensions::setupGLExtensions(unsigned int contextID)
 {
-    _isClampColorSupported = isGLExtensionSupported(contextID,"GL_ARB_color_buffer_float") ||
+    _isClampColorSupported = OSG_GL3_FEATURES ||
+                             isGLExtensionSupported(contextID,"GL_ARB_color_buffer_float") ||
                              strncmp((const char*)glGetString(GL_VERSION),"2.0",3)>=0;
 
     setGLExtensionFuncPtr(_glClampColor, "glClampColor", "glClampColorARB");
diff --git a/src/osg/Drawable.cpp b/src/osg/Drawable.cpp
index 0320a2ccb..45953a22a 100644
--- a/src/osg/Drawable.cpp
+++ b/src/osg/Drawable.cpp
@@ -960,7 +960,7 @@ void Drawable::Extensions::setupGLExtensions(unsigned int contextID)
     _isFogCoordSupported = isGLExtensionSupported(contextID,"GL_EXT_fog_coord");
     _isMultiTexSupported = isGLExtensionSupported(contextID,"GL_ARB_multitexture");
     _isOcclusionQuerySupported = osg::isGLExtensionSupported(contextID, "GL_NV_occlusion_query" );
-    _isARBOcclusionQuerySupported = osg::isGLExtensionSupported(contextID, "GL_ARB_occlusion_query" );
+    _isARBOcclusionQuerySupported = OSG_GL3_FEATURES || osg::isGLExtensionSupported(contextID, "GL_ARB_occlusion_query" );
 
     _isTimerQuerySupported = osg::isGLExtensionSupported(contextID, "GL_EXT_timer_query" );;
 
diff --git a/src/osg/Multisample.cpp b/src/osg/Multisample.cpp
index ef4bb6ab9..d43d7a7b7 100644
--- a/src/osg/Multisample.cpp
+++ b/src/osg/Multisample.cpp
@@ -88,7 +88,7 @@ void Multisample::Extensions::lowestCommonDenominator(const Extensions& rhs)
 
 void Multisample::Extensions::setupGLExtensions(unsigned int contextID)
 {
-    _isMultisampleSupported = isGLExtensionSupported(contextID,"GL_ARB_multisample");
+    _isMultisampleSupported = OSG_GLES2_FEATURES || OSG_GL3_FEATURES || isGLExtensionSupported(contextID,"GL_ARB_multisample");
     _isMultisampleFilterHintSupported = isGLExtensionSupported(contextID,"GL_NV_multisample_filter_hint");
 
     setGLExtensionFuncPtr(_glSampleCoverage, "glSampleCoverageARB");
diff --git a/src/osg/Point.cpp b/src/osg/Point.cpp
index 6ce70084a..2bf670ec8 100644
--- a/src/osg/Point.cpp
+++ b/src/osg/Point.cpp
@@ -140,12 +140,13 @@ void Point::Extensions::lowestCommonDenominator(const Extensions& rhs)
 
 void Point::Extensions::setupGLExtensions(unsigned int contextID)
 {
-    _isPointParametersSupported = strncmp((const char*)glGetString(GL_VERSION),"1.4",3)>=0 ||
+    _isPointParametersSupported = OSG_GL3_FEATURES ||
+                                  strncmp((const char*)glGetString(GL_VERSION),"1.4",3)>=0 ||
                                   isGLExtensionSupported(contextID,"GL_ARB_point_parameters") ||
                                   isGLExtensionSupported(contextID,"GL_EXT_point_parameters") ||
                                   isGLExtensionSupported(contextID,"GL_SGIS_point_parameters");
             
-    _isPointSpriteCoordOriginSupported = strncmp((const char*)glGetString(GL_VERSION),"2.0",3)>=0;
+    _isPointSpriteCoordOriginSupported = OSG_GL3_FEATURES || strncmp((const char*)glGetString(GL_VERSION),"2.0",3)>=0;
 
     setGLExtensionFuncPtr(_glPointParameteri, "glPointParameteri", "glPointParameteriARB");
     if (!_glPointParameteri) setGLExtensionFuncPtr(_glPointParameteri, "glPointParameteriEXT", "glPointParameteriSGIS");
diff --git a/src/osg/Texture.cpp b/src/osg/Texture.cpp
index fd7c1f7d0..e79fa1a94 100644
--- a/src/osg/Texture.cpp
+++ b/src/osg/Texture.cpp
@@ -2418,37 +2418,42 @@ void Texture::Extensions::setupGLExtensions(unsigned int contextID)
     
     const char* renderer = (const char*) glGetString(GL_RENDERER);
     std::string rendererString(renderer ? renderer : "");
+
+    bool builtInSupport = OSG_GLES2_FEATURES || OSG_GL3_FEATURES;
     
-    _isMultiTexturingSupported = isGLExtensionOrVersionSupported( contextID,"GL_ARB_multitexture", 1.3f) ||
+    _isMultiTexturingSupported = builtInSupport ||
+                                 isGLExtensionOrVersionSupported( contextID,"GL_ARB_multitexture", 1.3f) ||
                                  isGLExtensionOrVersionSupported(contextID,"GL_EXT_multitexture", 1.3f);
                                  
     _isTextureFilterAnisotropicSupported = isGLExtensionSupported(contextID,"GL_EXT_texture_filter_anisotropic");
     
-    _isTextureCompressionARBSupported = isGLExtensionOrVersionSupported(contextID,"GL_ARB_texture_compression", 1.3f);
+    _isTextureCompressionARBSupported = builtInSupport || isGLExtensionOrVersionSupported(contextID,"GL_ARB_texture_compression", 1.3f);
     
     _isTextureCompressionS3TCSupported = isGLExtensionSupported(contextID,"GL_EXT_texture_compression_s3tc");
     
-    _isTextureMirroredRepeatSupported = isGLExtensionOrVersionSupported(contextID,"GL_IBM_texture_mirrored_repeat", 1.4f) ||
+    _isTextureMirroredRepeatSupported = builtInSupport || 
+                                        isGLExtensionOrVersionSupported(contextID,"GL_IBM_texture_mirrored_repeat", 1.4f) ||
                                         isGLExtensionOrVersionSupported(contextID,"GL_ARB_texture_mirrored_repeat", 1.4f);
                                         
-    _isTextureEdgeClampSupported = isGLExtensionOrVersionSupported(contextID,"GL_EXT_texture_edge_clamp", 1.2f) || 
+    _isTextureEdgeClampSupported = builtInSupport ||
+                                   isGLExtensionOrVersionSupported(contextID,"GL_EXT_texture_edge_clamp", 1.2f) || 
                                    isGLExtensionOrVersionSupported(contextID,"GL_SGIS_texture_edge_clamp", 1.2f);
                                    
-    _isTextureBorderClampSupported = isGLExtensionOrVersionSupported(contextID,"GL_ARB_texture_border_clamp", 1.3f);
+    _isTextureBorderClampSupported = OSG_GL3_FEATURES || isGLExtensionOrVersionSupported(contextID,"GL_ARB_texture_border_clamp", 1.3f);
     
-    _isGenerateMipMapSupported = isGLExtensionOrVersionSupported(contextID,"GL_SGIS_generate_mipmap", 1.4f);
+    _isGenerateMipMapSupported = builtInSupport || isGLExtensionOrVersionSupported(contextID,"GL_SGIS_generate_mipmap", 1.4f);
                                   
-    _isShadowSupported = isGLExtensionSupported(contextID,"GL_ARB_shadow");
+    _isShadowSupported = OSG_GL3_FEATURES || isGLExtensionSupported(contextID,"GL_ARB_shadow");
     
     _isShadowAmbientSupported = isGLExtensionSupported(contextID,"GL_ARB_shadow_ambient");
 
     _isClientStorageSupported = isGLExtensionSupported(contextID,"GL_APPLE_client_storage");
 
-    _isNonPowerOfTwoTextureNonMipMappedSupported = isGLExtensionOrVersionSupported(contextID,"GL_ARB_texture_non_power_of_two", 2.0);
+    _isNonPowerOfTwoTextureNonMipMappedSupported = builtInSupport || isGLExtensionOrVersionSupported(contextID,"GL_ARB_texture_non_power_of_two", 2.0);
 
-    _isNonPowerOfTwoTextureMipMappedSupported = _isNonPowerOfTwoTextureNonMipMappedSupported;
+    _isNonPowerOfTwoTextureMipMappedSupported = builtInSupport || _isNonPowerOfTwoTextureNonMipMappedSupported;
     
-    _isTextureIntegerEXTSupported = isGLExtensionSupported(contextID, "GL_EXT_texture_integer");
+    _isTextureIntegerEXTSupported = OSG_GL3_FEATURES || isGLExtensionSupported(contextID, "GL_EXT_texture_integer");
 
     if (rendererString.find("Radeon")!=std::string::npos || rendererString.find("RADEON")!=std::string::npos)
     {
diff --git a/src/osg/Texture2DArray.cpp b/src/osg/Texture2DArray.cpp
index a960ec61e..3a6da201a 100644
--- a/src/osg/Texture2DArray.cpp
+++ b/src/osg/Texture2DArray.cpp
@@ -596,8 +596,8 @@ void Texture2DArray::Extensions::lowestCommonDenominator(const Extensions& rhs)
 
 void Texture2DArray::Extensions::setupGLExtensions(unsigned int contextID)
 {
-    _isTexture3DSupported = isGLExtensionSupported(contextID,"GL_EXT_texture3D");
-    _isTexture2DArraySupported = isGLExtensionSupported(contextID,"GL_EXT_texture_array");
+    _isTexture3DSupported = OSG_GL3_FEATURES || isGLExtensionSupported(contextID,"GL_EXT_texture3D");
+    _isTexture2DArraySupported = OSG_GL3_FEATURES || isGLExtensionSupported(contextID,"GL_EXT_texture_array");
 
     glGetIntegerv(GL_MAX_TEXTURE_SIZE, &_max2DSize);
     glGetIntegerv(GL_MAX_ARRAY_TEXTURE_LAYERS_EXT, &_maxLayerCount);
diff --git a/src/osg/Texture3D.cpp b/src/osg/Texture3D.cpp
index 2ddd8ab31..0d75c0b5a 100644
--- a/src/osg/Texture3D.cpp
+++ b/src/osg/Texture3D.cpp
@@ -579,7 +579,7 @@ void Texture3D::Extensions::lowestCommonDenominator(const Extensions& rhs)
 
 void Texture3D::Extensions::setupGLExtensions(unsigned int contextID)
 {
-    _isTexture3DFast = isGLExtensionSupported(contextID,"GL_EXT_texture3D");
+    _isTexture3DFast = OSG_GL3_FEATURES || isGLExtensionSupported(contextID,"GL_EXT_texture3D");
 
     if (_isTexture3DFast) _isTexture3DSupported = true;
     else _isTexture3DSupported = strncmp((const char*)glGetString(GL_VERSION),"1.2",3)>=0;