up3

server/world/visibility_level.go

@@ -0,0 +1,30 @@
+package world
+
+// VisibilityLevel controls whether a ViewLayer should use an entity's public visibility or force it
+// visible or invisible for a viewer.
+type VisibilityLevel struct {
+	visibility
+}
+
+// PublicVisibility is the default visibility level where the entity is (in)visible
+// depending on how it already is publicly viewed.
+func PublicVisibility() VisibilityLevel {
+	return VisibilityLevel{0}
+}
+
+// EnforceInvisible is the visibility level where the entity is always invisible to the viewer.
+func EnforceInvisible() VisibilityLevel {
+	return VisibilityLevel{1}
+}
+
+// EnforceVisible is the visibility level where the entity is always visible to the viewer.
+func EnforceVisible() VisibilityLevel {
+	return VisibilityLevel{2}
+}
+
+type visibility uint8
+
+// EnforceVisibility returns whether metadata should be changed.
+func (v visibility) EnforceVisibility() bool {
+	return v > 0
+}