Added notes to documentation and adjusted OpenGL example as a workaround for the side effects of making static functions that require a context work. If the user wants to make use of both sfml-graphics and OpenGL, they should make sure sf::Texture::getMaximumSize() and/or sf::Shader::isAvailable() are called at least once before setting their final context active as those functions will cause a context switch the first time they are called.

include/SFML/Graphics/Shader.hpp

@@ -486,6 +486,9 @@ public :
     /// the shader features. If it returns false, then
     /// any attempt to use sf::Shader will fail.
     ///
+    /// Note: The first call to this function, whether by your
+    /// code or SFML will result in a context switch.
+    ///
     /// \return True if shaders are supported, false otherwise
     ///
     ////////////////////////////////////////////////////////////

include/SFML/Graphics/Texture.hpp

@@ -460,6 +460,9 @@ public :
     /// You can expect a value of 512 pixels for low-end graphics
     /// card, and up to 8192 pixels or more for newer hardware.
     ///
+    /// Note: The first call to this function, whether by your
+    /// code or SFML will result in a context switch.
+    ///
     /// \return Maximum size allowed for textures, in pixels
     ///
     ////////////////////////////////////////////////////////////