X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fcore%2Fwindingtest.h;fp=source%2Fcore%2Fwindingtest.h;h=ffc52556bfaa5e9b6df35c5345e1afb212fdacab;hb=7aaec9a70b8d7733429bec043f8e33e02956f266;hp=0000000000000000000000000000000000000000;hpb=bec07999d95b76f4b47cffcc564d0cd0afc0435e;p=libs%2Fgl.git

diff --git a/source/core/windingtest.h b/source/core/windingtest.h
new file mode 100644
index 00000000..ffc52556
--- /dev/null
+++ b/source/core/windingtest.h
@@ -0,0 +1,45 @@
+#ifndef MSP_GL_WINDINGTEST_H_
+#define MSP_GL_WINDINGTEST_H_
+
+#include <msp/strings/lexicalcast.h>
+#include "bindable.h"
+#include "gl.h"
+
+namespace Msp {
+namespace GL {
+
+enum FaceWinding
+{
+	CLOCKWISE = GL_CW,
+	COUNTERCLOCKWISE = GL_CCW
+};
+
+void operator>>(const LexicalConverter &, FaceWinding &);
+
+/**
+Tests the winding of polygons.  If the order of vertices on screen does not
+match the winding, the polygon is not rendered.
+*/
+class WindingTest: public Bindable<WindingTest>
+{
+private:
+	FaceWinding winding;
+
+public:
+	WindingTest();
+	WindingTest(FaceWinding);
+
+	void bind() const;
+
+	static void unbind();
+
+	const WindingTest &get_reverse() const;
+
+	static const WindingTest &clockwise();
+	static const WindingTest &counterclockwise();
+};
+
+} // namespace GL
+} // namespace Msp
+
+#endif