Replaced GLEW with (a highly customized) loader generated by glLoadGen, restructured GLExtensions.hpp for easier extension bookkeeping, make use of GLEXT definitions in Shader.cpp and Texture.cpp as well, replaced GL_MAX_TEXTURE_COORDS with GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, implemented flags for requesting a debug or core/compatibility profile context, changed the default context version from 2.0 to 2.1.

include/SFML/Window/ContextSettings.hpp

@@ -35,6 +35,17 @@ namespace sf
 ////////////////////////////////////////////////////////////
 struct ContextSettings
 {
+    ////////////////////////////////////////////////////////////
+    /// \brief Enumeration of the context attribute flags
+    ///
+    ////////////////////////////////////////////////////////////
+    enum Attribute
+    {
+        Default = 0,      ///< Non-debug, compatibility context (this and the core attribute are mutually exclusive)
+        Core    = 1 << 0, ///< Core attribute
+        Debug   = 1 << 2  ///< Debug attribute
+    };
+
     ////////////////////////////////////////////////////////////
     /// \brief Default constructor
     ///
@@ -43,14 +54,16 @@ struct ContextSettings
     /// \param antialiasing Antialiasing level
     /// \param major        Major number of the context version
     /// \param minor        Minor number of the context version
+    /// \param attributes   Attribute flags of the context
     ///
     ////////////////////////////////////////////////////////////
-    explicit ContextSettings(unsigned int depth = 0, unsigned int stencil = 0, unsigned int antialiasing = 0, unsigned int major = 2, unsigned int minor = 0) :
+    explicit ContextSettings(unsigned int depth = 0, unsigned int stencil = 0, unsigned int antialiasing = 0, unsigned int major = 2, unsigned int minor = 1, unsigned int attributes = Default) :
     depthBits        (depth),
     stencilBits      (stencil),
     antialiasingLevel(antialiasing),
     majorVersion     (major),
-    minorVersion     (minor)
+    minorVersion     (minor),
+    attributeFlags   (attributes)
     {
     }
 
@@ -62,6 +75,7 @@ struct ContextSettings
     unsigned int antialiasingLevel; ///< Level of antialiasing
     unsigned int majorVersion;      ///< Major number of the context version to create
     unsigned int minorVersion;      ///< Minor number of the context version to create
+    Uint32       attributeFlags;    ///< The attribute flags to create the context with
 };
 
 } // namespace sf
@@ -76,10 +90,11 @@ struct ContextSettings
 ///
 /// ContextSettings allows to define several advanced settings
 /// of the OpenGL context attached to a window. All these
-/// settings have no impact on the regular SFML rendering
-/// (graphics module) -- except the anti-aliasing level, so
-/// you may need to use this structure only if you're using
-/// SFML as a windowing system for custom OpenGL rendering.
+/// settings with the exception of the compatibility flag
+/// and anti-aliasing level have no impact on the regular
+/// SFML rendering (graphics module), so you may need to use
+/// this structure only if you're using SFML as a windowing
+/// system for custom OpenGL rendering.
 ///
 /// The depthBits and stencilBits members define the number
 /// of bits per pixel requested for the (respectively) depth
@@ -94,6 +109,32 @@ struct ContextSettings
 /// all handled the same way (i.e. you can use any version
 /// < 3.0 if you don't want an OpenGL 3 context).
 ///
+/// When requesting a context with a version greater or equal
+/// to 3.2, you have the option of specifying whether the
+/// context should follow the core or compatibility profile
+/// of all newer (>= 3.2) OpenGL specifications. For versions
+/// 3.0 and 3.1 there is only the core profile. By default
+/// a compatibility context is created. You only need to specify
+/// the core flag if you want a core profile context to use with
+/// your own OpenGL rendering.
+/// <b>Warning: The graphics module will not function if you
+/// request a core profile context. Make sure the attributes are
+/// set to Default if you want to use the graphics module.</b>
+///
+/// Setting the debug attribute flag will request a context with
+/// additional debugging features enabled. Depending on the
+/// system, this might be required for advanced OpenGL debugging.
+/// OpenGL debugging is disabled by default.
+///
+/// <b>Special Note for OS X:</b>
+/// Apple only supports choosing between either a legacy context
+/// (OpenGL 2.1) or a core context (OpenGL version depends on the
+/// operating system version but is at least 3.2). Compatibility
+/// contexts are not supported. Further information is available on the
+/// <a href="https://developer.apple.com/opengl/capabilities/index.html">
+/// OpenGL Capabilities Tables</a> page. OS X also currently does
+/// not support debug contexts.
+///
 /// Please note that these values are only a hint.
 /// No failure will be reported if one or more of these values
 /// are not supported by the system; instead, SFML will try to