HATPC/scenes/engine/EC/EC.h

#ifndef __ENTITY_H
#define __ENTITY_H
#include <stdint.h>
#include <stdbool.h>
#include "raylib.h"
#include "sc/map/sc_map.h"
#include "sc/queue/sc_queue.h"

#define N_TAGS 4
#define N_COMPONENTS 10
#define MAX_COMP_POOL_SIZE 1024
typedef struct EntityManager EntityManager_t;
typedef struct Entity Entity_t;

typedef enum ComponentEnum {
    CBBOX_COMP_T,
    CTRANSFORM_COMP_T,
    CTILECOORD_COMP_T,
    CMOVEMENTSTATE_T,
    CJUMP_COMP_T,
    CPLAYERSTATE_T,
    CCONTAINER_T,
    CHITBOXES_T,
    CHURTBOX_T,
    CSPRITE_T,
} ComponentEnum_t;

typedef struct _CBBox_t {
    Vector2 size;
    Vector2 offset;
    Vector2 half_size;
    bool solid;
    bool fragile;
} CBBox_t;

typedef struct _CTransform_t {
    Vector2 prev_position;
    Vector2 position;
    Vector2 velocity;
    Vector2 accel;
    Vector2 fric_coeff;
} CTransform_t;

typedef struct _CMovementState_t {
    uint8_t ground_state;
    uint8_t water_state;
} CMovementState_t;

// This is to store the occupying tiles
// Limits to store 4 tiles at a tile,
// Thus the size of the entity cannot be larger than the tile
typedef struct _CTileCoord_t {
    unsigned int tiles[8];
    unsigned int n_tiles;
} CTileCoord_t;

typedef struct _CJump_t {
    unsigned int jumps;
    unsigned int max_jumps;
    int jump_speed;
    bool jumped;
    bool jump_ready;
    bool short_hop;
} CJump_t;

typedef enum PlayerState {
    GROUNDED,
    AIR,
} PlayerState_t;

typedef struct _CPlayerState_t {
    Vector2 player_dir;
    uint8_t jump_pressed;
    uint8_t is_crouch;
    bool ladder_state;
} CPlayerState_t;

typedef enum ContainerItem {
    CONTAINER_EMPTY,
    CONTAINER_LEFT_ARROW,
    CONTAINER_RIGHT_ARROW,
    CONTAINER_UP_ARROW,
    CONTAINER_DOWN_ARROW,
    CONTAINER_COIN,
    CONTAINER_BOMB,
} ContainerItem_t;

typedef enum ContainerMaterial {
    WOODEN_CONTAINER,
    METAL_CONTAINER,
} ContainerMaterial_t;

typedef struct _CContainer_t {
    ContainerMaterial_t material;
    ContainerItem_t item;
} CContainer_t;

typedef struct _CHitBoxes_t {
    Rectangle boxes[2];
    uint8_t n_boxes;
    bool strong;
} CHitBoxes_t;

typedef struct _CHurtbox_t {
    Vector2 offset;
    Vector2 size;
    bool fragile;
} CHurtbox_t;

// Credits to bedroomcoders.co.uk for this
typedef struct Sprite {
    Texture2D* texture;
    Vector2 frame_size;
    Vector2 origin;
    int frame_count;
    int current_frame;
    int elapsed;
    int speed;
    char* name;
} Sprite_t;

typedef unsigned int (*sprite_transition_func_t)(Entity_t *ent); // Transition requires knowledge of the entity
typedef struct _SpriteRenderInfo
{
    Sprite_t* sprite;
    Vector2 offset;
    bool flip_x;
    bool flip_y;
} SpriteRenderInfo_t;

typedef struct _CSprite_t {
    SpriteRenderInfo_t* sprites;
    sprite_transition_func_t transition_func;
    unsigned int current_idx;
} CSprite_t;

static inline void set_bbox(CBBox_t* p_bbox, unsigned int x, unsigned int y)
{
    p_bbox->size.x = x;
    p_bbox->size.y = y;
    p_bbox->half_size.x = (unsigned int)(x / 2);
    p_bbox->half_size.y = (unsigned int)(y / 2);
}

typedef enum EntityTag {
    NO_ENT_TAG,
    PLAYER_ENT_TAG,
    ENEMY_ENT_TAG,
    CRATES_ENT_TAG,
} EntityTag_t;

struct Entity {
    unsigned long m_id;
    EntityTag_t m_tag;
    bool m_alive;
    unsigned long components[N_COMPONENTS]; 
    EntityManager_t* manager;
};

struct EntityManager {
    // All fields are Read-Only
    struct sc_map_64v entities; // ent id : entity
    struct sc_map_64v entities_map[N_TAGS]; // [{ent id: ent}]
    struct sc_map_64v component_map[N_COMPONENTS]; // [{ent id: comp}, ...]
    struct sc_queue_uint to_add;
    struct sc_queue_uint to_remove;
};

void init_entity_manager(EntityManager_t* p_manager);
void update_entity_manager(EntityManager_t* p_manager);
void clear_entity_manager(EntityManager_t* p_manager);
void free_entity_manager(EntityManager_t* p_manager);

Entity_t* add_entity(EntityManager_t* p_manager, EntityTag_t tag);
void remove_entity(EntityManager_t* p_manager, unsigned long id);
Entity_t *get_entity(EntityManager_t* p_manager, unsigned long id);

void* add_component(Entity_t *entity, ComponentEnum_t comp_type);
void* get_component(Entity_t *entity, ComponentEnum_t comp_type);
void remove_component(Entity_t* entity, ComponentEnum_t comp_type);

#endif // __ENTITY_H