feat(zones): add basic zone support to the server

Quick and dirty with many features stripped (onEnter/onExit/inside).

imports/zones/server.lua

@@ -0,0 +1,101 @@
+local glm = require 'glm'
+
+---@type { [number]: CZone }
+Zones = {}
+
+local function removeZone(self)
+    Zones[self.id] = nil
+end
+
+local glm_polygon_contains = glm.polygon.contains
+
+local function contains(self, coords)
+    return glm_polygon_contains(self.polygon, coords, self.thickness / 4)
+end
+
+local function insideSphere(self, coords)
+    return #(self.coords - coords) < self.radius
+end
+
+local function convertToVector(coords)
+    local _type = type(coords)
+
+    if _type ~= 'vector3' then
+        if _type == 'table' or _type == 'vector4' then
+            return vec3(coords[1] or coords.x, coords[2] or coords.y, coords[3] or coords.z)
+        end
+
+        error(("expected type 'vector3' or 'table' (received %s)"):format(_type))
+    end
+
+    return coords
+end
+
+lib.zones = {
+    ---@return CZone
+    poly = function(data)
+        data.id = #Zones + 1
+        data.thickness = data.thickness or 4
+
+        local pointN = #data.points
+        local points = table.create(pointN, 0)
+
+        for i = 1, pointN do
+            points[i] = convertToVector(data.points[i])
+        end
+
+        data.polygon = glm.polygon.new(points)
+        data.coords = data.polygon:centroid()
+        data.remove = removeZone
+        data.contains = contains
+        data.debug = nil
+        data.inside = nil
+        data.onEnter = nil
+        data.onExit = nil
+
+        Zones[data.id] = data
+        return data
+    end,
+
+    ---@return CZone
+    box = function(data)
+        data.id = #Zones + 1
+        data.coords = convertToVector(data.coords)
+        data.size = data.size and convertToVector(data.size) / 2 or vec3(2)
+        data.thickness = data.size.z * 2 or 4
+        data.rotation = quat(data.rotation or 0, vec3(0, 0, 1))
+        data.polygon = (data.rotation * glm.polygon.new({
+            vec3(data.size.x, data.size.y, 0),
+            vec3(-data.size.x, data.size.y, 0),
+            vec3(-data.size.x, -data.size.y, 0),
+            vec3(data.size.x, -data.size.y, 0),
+        }) + data.coords)
+        data.remove = removeZone
+        data.contains = contains
+        data.debug = nil
+        data.inside = nil
+        data.onEnter = nil
+        data.onExit = nil
+
+        Zones[data.id] = data
+        return data
+    end,
+
+    ---@return CZone
+    sphere = function(data)
+        data.id = #Zones + 1
+        data.coords = convertToVector(data.coords)
+        data.radius = (data.radius or 2) + 0.0
+        data.remove = removeZone
+        data.contains = insideSphere
+        data.debug = nil
+        data.inside = nil
+        data.onEnter = nil
+        data.onExit = nil
+
+        Zones[data.id] = data
+        return data
+    end,
+}
+
+return lib.zones