return extensions.count(ext);
}
+void require_extension(const string &ext)
+{
+ if(!is_supported(ext))
+ throw UnsupportedExtension(ext);
+}
+
const Version &get_gl_version()
{
static Version version;
return version;
}
-void require_extension(const string &ext)
+bool is_version_at_least(unsigned a, unsigned b)
{
- if(!is_supported(ext))
- throw UnsupportedExtension(ext);
+ const Version &ver = get_gl_version();
+ return (ver.major>a || (ver.major==a && ver.minor>=b));
}
void require_version(unsigned a, unsigned b)
{
- const Version &ver = get_gl_version();
- if(ver.major<a || (ver.major==a && ver.minor<b))
+ if(!is_version_at_least(a, b))
throw UnsupportedExtension(format("OpenGL %d.%d", a, b));
}