X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fcore%2Fwindingtest.cpp;fp=source%2Fcore%2Fwindingtest.cpp;h=0b8218adbf2773971b589c89cccefa134d403788;hb=7aaec9a70b8d7733429bec043f8e33e02956f266;hp=0000000000000000000000000000000000000000;hpb=bec07999d95b76f4b47cffcc564d0cd0afc0435e;p=libs%2Fgl.git

diff --git a/source/core/windingtest.cpp b/source/core/windingtest.cpp
new file mode 100644
index 00000000..0b8218ad
--- /dev/null
+++ b/source/core/windingtest.cpp
@@ -0,0 +1,61 @@
+#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