+enum FILTERS {
+ FILTER_ACTORCLIP,
+ FILTER_WEAPONCLIP,
+ FILTER_NODRAW,
+ FILTER_STEPON,
+ FILTER_LEVEL1,
+ FILTER_LEVEL2,
+ FILTER_LEVEL3,
+ FILTER_LEVEL4,
+ FILTER_LEVEL5,
+ FILTER_LEVEL6,
+ FILTER_LEVEL7,
+ FILTER_LEVEL8,
+
+ FILTER_MAX
+};
+
+#define UFOAI_CONTENTS_LEVEL_1 0x0100
+#define UFOAI_CONTENTS_LEVEL_2 0x0200
+#define UFOAI_CONTENTS_LEVEL_3 0x0400
+#define UFOAI_CONTENTS_LEVEL_4 0x0800
+#define UFOAI_CONTENTS_LEVEL_5 0x1000
+#define UFOAI_CONTENTS_LEVEL_6 0x2000
+#define UFOAI_CONTENTS_LEVEL_7 0x4000
+#define UFOAI_CONTENTS_LEVEL_8 0x8000
+
+#define UFOAI_CONTENTS_ACTORCLIP 0x00010000
+#define UFOAI_CONTENTS_WEAPONCLIP 0x02000000
+#define UFOAI_CONTENTS_STEPON 0x40000000
+
+#define UFOAI_SURF_NODRAW 0x00000080
+
+