From 29e7b34b3f4cc23e32566f1e8e3c7f54feb67174 Mon Sep 17 00:00:00 2001
From: Sara <sara@saragerretsen.nl>
Date: Thu, 2 Nov 2023 14:28:32 +0100
Subject: [PATCH] created game world module to manage and run Behaviour
 Entities

---
 src/game_world.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/game_world.h | 15 +++++++++
 2 files changed, 95 insertions(+)
 create mode 100644 src/game_world.c
 create mode 100644 src/game_world.h

diff --git a/src/game_world.c b/src/game_world.c
new file mode 100644
index 0000000..a8fed34
--- /dev/null
+++ b/src/game_world.c
@@ -0,0 +1,80 @@
+#include "game_world.h"
+
+#include "behaviour_entity.h"
+#include "list.h"
+#include "program.h"
+
+static List _add_queue;
+static List _remove_queue;
+static List _game_entities;
+
+static inline
+size_t _internal_find_index_for_entity(void* data, const List* list) {
+    for(size_t i = 0; i < _game_entities.len; ++i) {
+        BehaviourEntity* entity = list_at_as(BehaviourEntity, &_game_entities, i);
+        if(entity->data == entity) {
+            return i;
+        }
+    }
+
+    return list->len;
+}
+
+static inline
+void _internal_clear_removed() {
+    list_foreach(size_t, index, &_remove_queue) {
+        BehaviourEntity* entity = list_at_as(BehaviourEntity, &_game_entities, *index);
+        entity->drop->drop(entity->data);
+        list_erase(&_game_entities, *index);
+    }
+    list_empty(&_remove_queue);
+}
+
+static inline
+void _internal_process_new() {
+    list_foreach(BehaviourEntity, entity, &_add_queue) {
+        list_add(&_game_entities, entity);
+        entity->tc->start(entity->data);
+    }
+    list_empty(&_add_queue);
+}
+
+void game_world_init() {
+    _game_entities = list_from_type(BehaviourEntity);
+    _add_queue = list_from_type(BehaviourEntity);
+    _remove_queue = list_from_type(size_t);
+}
+
+void game_world_close() {
+    _internal_clear_removed();
+    _internal_process_new();
+    list_foreach(BehaviourEntity, entity, &_game_entities) {
+        entity->drop->drop(entity->data);
+    }
+    list_empty(&_game_entities);
+}
+
+void game_world_add_entity(BehaviourEntity entity) {
+    list_add(&_add_queue, &entity);
+}
+
+void game_world_remove_entity(void* entity) {
+    size_t index = _internal_find_index_for_entity(entity, &_game_entities);
+    if(index != _game_entities.len) {
+        list_add(&_remove_queue, &index);
+    }
+}
+
+void game_world_update() {
+    _internal_process_new();
+    list_foreach(BehaviourEntity, entity, &_game_entities) {
+        entity->tc->update(entity->data, delta_time());
+    }
+    _internal_clear_removed();
+}
+
+void game_word_draw() {
+    list_foreach(BehaviourEntity, entity, &_game_entities) {
+        entity->tc->draw(entity->data);
+    }
+}
diff --git a/src/game_world.h b/src/game_world.h
new file mode 100644
index 0000000..d35c7d2
--- /dev/null
+++ b/src/game_world.h
@@ -0,0 +1,15 @@
+#ifndef _fencer_game_world_h
+#define _fencer_game_world_h
+
+#include "behaviour_entity.h"
+
+extern void game_world_init();
+extern void game_world_close();
+
+extern void game_world_add_entity(BehaviourEntity entity);
+extern void game_world_remove_entity(void* entity);
+
+extern void game_world_update();
+extern void game_world_draw();
+
+#endif // !_fencer_game_world_h