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diff --git a/public/materialsystem/combineoperations.h b/public/materialsystem/combineoperations.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef COMBINEOPERATIONS_H
+#define COMBINEOPERATIONS_H
+#pragma once
+
+// New combines must be added between FirstPrecacheMaterial and LastPrecacheMaterial.
+// Keep these in sync with cCombineMaterialName in ctexturecompositor.cpp
+enum ECombineOperation
+{
+	ECO_FirstPrecacheMaterial = 0,
+	ECO_Multiply = 0,
+	ECO_Add = 1,
+	ECO_Lerp = 2,
+
+	ECO_Select = 3,
+
+	ECO_Legacy_Lerp_FirstPass = 4,	// Must be 4, or shaders need to be updated!
+	ECO_Legacy_Lerp_SecondPass = 5, // Must be 5, or shaders need to be updated!
+
+	ECO_Blend = 6,
+
+	ECO_LastPrecacheMaterial,
+
+	ECO_Error,
+
+	ECO_COUNT
+
+};
+
+#endif /* COMBINEOPERATIONS_H */