Add is_version_at_least function

[libs/gl.git] / source / extension.cpp

diff --git a/source/extension.cpp b/source/extension.cpp
index 9ed1777914b9076c89f8c55ba58f0a6012ca54db..bab160d5196fe71519f8fbeca3e2680f9bbc1032 100644 (file)
--- a/source/extension.cpp
+++ b/source/extension.cpp
@@ -60,6 +60,12 @@ bool is_supported(const string &ext)
        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;
@@ -84,16 +90,15 @@ const Version &get_gl_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));
 }