X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Fextension.h;h=aec516e2766a3bce033f3bbd0e7942e04417c587;hp=d6eb75f6a396eccec9c17cd7e6a111e3cb7406aa;hb=a4ec5410595ddf37bfbc0e85ad87d31a9cbf94f1;hpb=5318aa4fd553be4ce0bc428e73592b787842cdea

diff --git a/source/extension.h b/source/extension.h
index d6eb75f6..aec516e2 100644
--- a/source/extension.h
+++ b/source/extension.h
@@ -13,6 +13,12 @@ Distributed under the LGPL
 namespace Msp {
 namespace GL {
 
+struct Version
+{
+	unsigned short major;
+	unsigned short minor;
+};
+
 typedef void ExtFunc();
 
 /**
@@ -21,11 +27,22 @@ functions of that extension are safe to use.
 */
 bool is_supported(const std::string &);
 
+/**
+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();
+
 /**
 Checks that an extension is supported and throws if it isn't.
 */
 void require_extension(const std::string &);
 
+/**
+Checks that the OpenGL version is at least a.b and throws if it isn't.
+*/
+void require_version(unsigned a, unsigned b);
+
 /**
 Returns the address of an extension function.
 */