Clean up texture filtering settings (#13683)

src/client/mesh.h

@@ -19,6 +19,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 #pragma once
 
+#include "SMaterialLayer.h"
 #include "irrlichttypes_extrabloated.h"
 #include "nodedef.h"
 
@@ -133,3 +134,10 @@ void recalculateBoundingBox(scene::IMesh *src_mesh);
 	We assume normal to be valid when it's 0 < length < Inf. and not NaN
  */
 bool checkMeshNormals(scene::IMesh *mesh);
+
+/*
+	Set the MinFilter, MagFilter and AnisotropicFilter properties of a texture
+	layer according to the three relevant boolean values found in the Minetest
+	settings.
+*/ 
+void setMaterialFilters(video::SMaterialLayer &tex, bool bilinear, bool trilinear, bool anisotropic);