attempt to speed up float truncation and add some unit tests

source/tests/CMakeLists.txt

@@ -26,6 +26,7 @@ IF(BUILD_MEGAGLEST_TESTS)
 
 	SET(DIRS_WITH_SRC
                 ./
+                shared_lib/graphics
 		shared_lib/xml)
 	
 	SET(MG_INCLUDES_ROOT "./")

source/tests/shared_lib/graphics/math_util_test.cpp

@@ -0,0 +1,68 @@
+// ==============================================================
+//	This file is part of MegaGlest Unit Tests (www.megaglest.org)
+//
+//	Copyright (C) 2013 Mark Vejvoda
+//
+//	You can redistribute this code and/or modify it under
+//	the terms of the GNU General Public License as published
+//	by the Free Software Foundation; either version 2 of the
+//	License, or (at your option) any later version
+// ==============================================================
+
+#include <cppunit/extensions/HelperMacros.h>
+#include <memory>
+#include "math_util.h"
+
+#ifdef WIN32
+#include <io.h>
+#else
+#include <unistd.h>
+#endif
+
+using namespace Shared::Graphics;
+
+//
+// Tests for XmlIo
+//
+class MathUtilTest : public CppUnit::TestFixture {
+	// Register the suite of tests for this fixture
+	CPPUNIT_TEST_SUITE( MathUtilTest );
+
+	CPPUNIT_TEST( test_RoundFloat );
+
+	CPPUNIT_TEST_SUITE_END();
+	// End of Fixture registration
+
+public:
+
+	void test_RoundFloat() {
+		float value1 = truncateDecimal<float>(1.123456f, 6);
+		CPPUNIT_ASSERT_EQUAL( 1.123456f, value1 );
+
+		value1 = truncateDecimal<float>(1.123456f, 5);
+		CPPUNIT_ASSERT_EQUAL( 1.12346f, value1 );
+
+		value1 = truncateDecimal<float>(1.123456f, 4);
+		CPPUNIT_ASSERT_EQUAL( 1.1235f, value1 );
+
+		value1 = truncateDecimal<float>(1.123456f, 3);
+		CPPUNIT_ASSERT_EQUAL( 1.123f, value1 );
+
+		value1 = truncateDecimal<float>(1.123456f, 2);
+		CPPUNIT_ASSERT_EQUAL( 1.12f, value1 );
+
+		value1 = truncateDecimal<float>(1.123456f, 1);
+		CPPUNIT_ASSERT_EQUAL( 1.1f, value1 );
+
+		int32 value2 = xs_CRoundToInt(1.123456f);
+		CPPUNIT_ASSERT_EQUAL( (int32)1, value2 );
+
+		value2 = xs_CRoundToInt(1.523456f);
+		CPPUNIT_ASSERT_EQUAL( (int32)2, value2 );
+	}
+};
+
+
+// Test Suite Registrations
+CPPUNIT_TEST_SUITE_REGISTRATION( MathUtilTest );
+//