/* $Id$
This file is part of libmspgl
-Copyright © 2007 Mikko Rasa, Mikkosoft Productions
+Copyright © 2007-2008, 2010 Mikko Rasa, Mikkosoft Productions
Distributed under the LGPL
*/
namespace Msp {
namespace GL {
+struct Version
+{
+ unsigned short major;
+ unsigned short minor;
+};
+
typedef void ExtFunc();
/**
void require_extension(const std::string &);
/**
-Returns the address of an extension function.
+RAII version of require_extension. Useful as a static local variable.
+*/
+struct RequireExtension
+{
+ RequireExtension(const std::string &e) { require_extension(e); }
+};
+
+/**
+Returns the OpenGL version number, as reported by the implementation.
+Functions up to the returned version are safe to use.
+*/
+const Version &get_gl_version();
+
+/**
+Indicates whether the OpenGL version is at least a.b.
+*/
+bool is_version_at_least(unsigned a, unsigned b);
+
+/**
+Checks that the OpenGL version is at least a.b and throws if it isn't.
+*/
+void require_version(unsigned a, unsigned b);
+
+/**
+RAII version of require_version. Useful as a static local variable.
+*/
+struct RequireVersion
+{
+ RequireVersion(unsigned a, unsigned b) { require_version(a, b); }
+};
+
+/**
+Returns the address of an extension function. Only indended for internal use.
*/
ExtFunc *get_proc_address(const std::string &);