Setup rpg stuff

src/rpg/entity/entity.h

@@ -0,0 +1,55 @@
+/**
+ * Copyright (c) 2025 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "direction.h"
+#include "rpg/entity/player.h"
+#include "npc.h"
+#include "physics/physics.h"
+
+#define ENTITY_FRICTION 0.9f
+#define ENTITY_MIN_VELOCITY 0.05f
+
+typedef struct map_s map_t;
+
+typedef enum {
+  ENTITY_TYPE_NULL,
+  ENTITY_TYPE_PLAYER,
+  ENTITY_TYPE_NPC,
+
+  ENTITY_TYPE_COUNT
+} entitytype_t;
+
+typedef struct entity_s {
+  map_t *map;
+  entitytype_t type;
+  direction_t direction;
+
+  vec2 position;
+  vec2 velocity;
+
+  union {
+    player_t player;
+    npc_t npc;
+  };
+} entity_t;
+
+/**
+ * Initializes an entity structure.
+ * 
+ * @param entity Pointer to the entity structure to initialize.
+ * @param type The type of the entity.
+ * @param map Pointer to the map the entity belongs to.
+ */
+void entityInit(entity_t *entity, const entitytype_t type, map_t *map);
+
+/**
+ * Updates an entity.
+ * 
+ * @param entity Pointer to the entity structure to update.
+ */
+void entityUpdate(entity_t *entity);