#define IS_OBSOLETE(e) HAS_PROPERTY(e, EP_OBSOLETE)
/* special macros used in game engine */
+#define IS_FILE_ELEMENT(e) ((e) >= 0 && \
+ (e) <= NUM_FILE_ELEMENTS)
+
+#define IS_DRAWABLE_ELEMENT(e) ((e) >= 0 && \
+ (e) <= NUM_DRAWABLE_ELEMENTS)
+
+#define IS_RUNTIME_ELEMENT(e) ((e) >= 0 && \
+ (e) <= NUM_RUNTIME_ELEMENTS)
+
+#define IS_VALID_ELEMENT(e) ((e) >= 0 && \
+ (e) <= MAX_NUM_ELEMENTS)
+
#define IS_CUSTOM_ELEMENT(e) ((e) >= EL_CUSTOM_START && \
(e) <= EL_CUSTOM_END)
#define EL_EMC_DRIPPER_ACTIVE (EL_FIRST_RUNTIME_REAL + 70)
#define EL_EMC_SPRING_BUMPER_ACTIVE (EL_FIRST_RUNTIME_REAL + 71)
+#define NUM_DRAWABLE_ELEMENTS (EL_FIRST_RUNTIME_REAL + 72)
+
/* "unreal" (and therefore not drawable) runtime elements */
-#define EL_FIRST_RUNTIME_UNREAL (EL_FIRST_RUNTIME_REAL + 72)
+#define EL_FIRST_RUNTIME_UNREAL (NUM_DRAWABLE_ELEMENTS)
#define EL_BLOCKED (EL_FIRST_RUNTIME_UNREAL + 0)
#define EL_EXPLOSION (EL_FIRST_RUNTIME_UNREAL + 1)