+#include <msp/strings/format.h>
+#include "windingtest.h"
+
+namespace Msp {
+namespace GL {
+
+void operator>>(const LexicalConverter &conv, FaceWinding &winding)
+{
+ if(conv.get()=="CLOCKWISE")
+ winding = CLOCKWISE;
+ else if(conv.get()=="COUNTERCLOCKWISE")
+ winding = COUNTERCLOCKWISE;
+ else
+ throw lexical_error(format("conversion of '%s' to FaceWinding", conv.get()));
+}
+
+WindingTest::WindingTest():
+ winding(COUNTERCLOCKWISE)
+{ }
+
+WindingTest::WindingTest(FaceWinding w):
+ winding(w)
+{ }
+
+void WindingTest::bind() const
+{
+ if(set_current(this))
+ {
+ glEnable(GL_CULL_FACE);
+ glFrontFace(winding);
+ }
+}
+
+void WindingTest::unbind()
+{
+ if(set_current(0))
+ glDisable(GL_CULL_FACE);
+}
+
+const WindingTest &WindingTest::get_reverse() const
+{
+ if(winding==CLOCKWISE)
+ return counterclockwise();
+ else
+ return clockwise();
+}
+
+const WindingTest &WindingTest::clockwise()
+{
+ static WindingTest test(CLOCKWISE);
+ return test;
+}
+
+const WindingTest &WindingTest::counterclockwise()
+{
+ static WindingTest test(COUNTERCLOCKWISE);
+ return test;
+}
+
+} // namespace GL
+} // namespace Msp