Move ECS to Bubel module

source/bubel/ecs/system.d

@@ -0,0 +1,166 @@
+/************************************************************************************************************************
+System module.
+
+Copyright: Copyright © 2018-2019, Dawid Masiukiewicz, Michał Masiukiewicz
+License: BSD 3-clause, see LICENSE file in project root folder.
+*/
+module bubel.ecs.system;
+
+import bubel.ecs.entity;
+import bubel.ecs.manager;
+
+/************************************************************************************************************************
+System contain data required to proper glue EntityManager with Systems.
+System callbacks:
+$(LIST
+    * void onUpdate(EntitesData);
+    * void onEnable()
+    * void onDisable();
+    * bool onBegin();
+    * void onEnd();
+    * void onCreate()
+    * void onDestroy();
+    * void onAddEntity(EntitesData);
+    * void onRemoveEntity(EntitiesData);
+    * void onChangeEntity(EntitiesData);
+    * void handleEvent(Entity*, Event);
+)
+*/
+struct System
+{
+
+    /************************************************************************************************************************
+    Check if system is enabled.
+    */
+    export bool enabled() nothrow @nogc
+    {
+        return m_enabled;
+    }
+
+    /************************************************************************************************************************
+    Enable system. If actually it is enabled function do nothing.
+    */
+    export void enable() nothrow @nogc
+    {
+        if (!m_enabled && m_enable)
+            (cast(void function(void*) nothrow @nogc) m_enable)(m_system_pointer);
+        m_enabled = true;
+    }
+
+    /************************************************************************************************************************
+    Disable system. If actually it is disabled function do nothing.
+    */
+    export void disable() nothrow @nogc
+    {
+        if (m_enabled && m_disable)
+            (cast(void function(void*) nothrow @nogc) m_disable)(m_system_pointer);
+        m_enabled = false;
+    }
+
+    /************************************************************************************************************************
+    Get system priority.
+    */
+    export int priority() nothrow @nogc
+    {
+        return m_priority;
+    }
+
+    /************************************************************************************************************************
+    Get system priority.
+    */
+    export bool execute() nothrow @nogc
+    {
+        return m_execute;
+    }
+
+    /************************************************************************************************************************
+    Get system priority.
+    */
+    export ushort id() nothrow @nogc
+    {
+        return m_id;
+    }
+
+    /************************************************************************************************************************
+    Get system name.
+    */
+    export const(char)[] name() nothrow @nogc
+    {
+        return cast(const(char)[]) m_name;
+    }
+
+package:
+
+    struct EventCaller
+    {
+        ushort id;
+        void* callback;
+    }
+
+    ///should system be executed in current update?
+    bool m_execute = true;
+    ///system id
+    ushort m_id;
+    ///is system empty? Empty systems don't update entities, and is called once per update
+    bool m_empty = false;
+
+    ///should system update and catch events?
+    bool m_enabled = false;
+    ///system priority
+    int m_priority;
+    ///pointer to system implementation
+    void* m_system_pointer;
+    ///system pass index
+    int m_pass;
+
+    ///system name
+    char[] m_name;
+
+    ///required components
+    ushort[] m_components;
+    ///excluded components
+    ushort[] m_excluded_components;
+    ///optional components
+    ushort[] m_optional_components;
+
+    EntityManager.Job[] jobs;
+
+    //System*[] m_dependencies;
+    ushort[] m_read_only_components;
+    ushort[] m_modified_components;
+
+    EntityManager.SystemCaller* m_any_system_caller;
+
+    EventCaller[] m_event_callers;
+
+    //void function(ref EntityManager.CallData data) m_update;
+    void* m_update; ///workaroud for DMD bug with upper line
+    void delegate() m_update_delegate;
+
+    //void function(void* system_pointer) m_enable;
+    //void function(void* system_pointer) m_disable;
+
+    //void function(void* system_pointer) m_create;
+    //void function(void* system_pointer) m_destroy;
+
+    //void function(void* system_pointer) m_begin;
+    //void function(void* system_pointer) m_end;
+
+    void* m_enable;
+    void* m_disable;
+
+    void* m_create;
+    void* m_destroy;
+
+    void* m_begin;
+    void* m_end;
+
+    void* m_add_entity;
+    void* m_remove_entity;
+    void* m_change_entity;
+
+    //void function(ref EntityManager.CallData data) m_initialize;
+    //void function(ref EntityManager.CallData data) m_deinitilize;
+    void* m_initialize;
+    void* m_deinitilize;
+}