GSdx: When mipmapping is on, LOD is calculated per pixel, it isn't used for anything, but it's there. I cannot really measure any significant slowdown, but rest of the fun is yet to come.

git-svn-id: http://pcsx2.googlecode.com/svn/trunk@4428 96395faa-99c1-11dd-bbfe-3dabce05a288

plugins/GSdx/GSDrawScanlineCodeGenerator.cpp

@@ -34,6 +34,14 @@ const GSVector4i GSDrawScanlineCodeGenerator::m_test[8] =
 	GSVector4i::zero(),
 };
 
+const GSVector4 GSDrawScanlineCodeGenerator::m_log2_coef[4] = 
+{
+	GSVector4(0.204446009836232697516f),
+	GSVector4(-1.04913055217340124191f),
+	GSVector4(2.28330284476918490682f),
+	GSVector4(1.0f),
+};
+
 GSDrawScanlineCodeGenerator::GSDrawScanlineCodeGenerator(void* param, uint64 key, void* code, size_t maxsize)
 	: GSCodeGenerator(code, maxsize)
 	, m_local(*(GSScanlineLocalData*)param)