namespace Msp {
namespace GL {
+struct Version
+{
+ unsigned short major;
+ unsigned short minor;
+};
+
typedef void ExtFunc();
/**
*/
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 &);
+/**
+RAII version of require_extension. Useful as a static local variable.
+*/
+struct RequireExtension
+{
+ RequireExtension(const std::string &e) { require_extension(e); }
+};
+
+/**
+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.
*/