modules/world: add a view number limit

gamecore/modules/world/camera.lua

@@ -28,6 +28,7 @@ local CameraSystem  = Object:extend()
 local View          = require(cwd .. "libs.hump.camera")
 
 local SPLITSCREEN_ISVERTICAL  = false
+local SCREEN_LIMIT            = 4
 
 -- INIT FUNCTIONS
 -- Initialize the camera system
@@ -63,6 +64,7 @@ end
 -- Access data from the views
 
 function CameraSystem:addView(x, y)
+  if (#self.view.list < SCREEN_LIMIT) then
     local view = {}
 
     view.cam    = View(x, y, 1, 0, true)
@@ -71,6 +73,7 @@ function CameraSystem:addView(x, y)
 
     table.insert(self.views.list, view)
   end
+end
 
 function CameraSystem:getView(id)
   return self.views.list[id]