X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fwindingtest.cpp;h=acbc20fc5ba127688c89c95caa0d5207a7c66f24;hb=a533f857e7d319c6eff2b788bbad3a238468c4b2;hp=401d68035af46703e8496b6eaff9e452026b8ae2;hpb=f14435e58bfa0fa697a06ba9a454bb30cd37d9d8;p=libs%2Fgl.git

diff --git a/source/windingtest.cpp b/source/windingtest.cpp
index 401d6803..acbc20fc 100644
--- a/source/windingtest.cpp
+++ b/source/windingtest.cpp
@@ -1,3 +1,4 @@
+#include <msp/strings/format.h>
 #include "windingtest.h"
 
 namespace Msp {
@@ -10,7 +11,7 @@ void operator>>(const LexicalConverter &conv, FaceWinding &winding)
 	else if(conv.get()=="COUNTERCLOCKWISE")
 		winding = COUNTERCLOCKWISE;
 	else
-		throw InvalidParameterValue("Invalid FaceWinding");
+		throw lexical_error(format("conversion of '%s' to FaceWinding", conv.get()));
 }
 
 WindingTest::WindingTest():
@@ -43,13 +44,23 @@ void WindingTest::unbind()
 		glDisable(GL_CULL_FACE);
 }
 
-WindingTest &WindingTest::clockwise()
+const WindingTest &WindingTest::get_reverse() const
+{
+	if(!test)
+		return *this;
+	else if(winding==CLOCKWISE)
+		return counterclockwise();
+	else
+		return clockwise();
+}
+
+const WindingTest &WindingTest::clockwise()
 {
 	static WindingTest test(CLOCKWISE);
 	return test;
 }
 
-WindingTest &WindingTest::counterclockwise()
+const WindingTest &WindingTest::counterclockwise()
 {
 	static WindingTest test(COUNTERCLOCKWISE);
 	return test;