meta.h

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#ifdef FLECS_META
 
#include <stddef.h>
 
#ifndef FLECS_MODULE
#define FLECS_MODULE
#endif
 
#ifndef FLECS_META_H
#define FLECS_META_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
#define ECS_MEMBER_DESC_CACHE_SIZE (32)
 
typedef bool ecs_bool_t;
typedef char ecs_char_t;
typedef unsigned char ecs_byte_t;
typedef uint8_t ecs_u8_t;
typedef uint16_t ecs_u16_t;
typedef uint32_t ecs_u32_t;
typedef uint64_t ecs_u64_t;
typedef uintptr_t ecs_uptr_t;
typedef int8_t ecs_i8_t;
typedef int16_t ecs_i16_t;
typedef int32_t ecs_i32_t;
typedef int64_t ecs_i64_t;
typedef intptr_t ecs_iptr_t;
typedef float ecs_f32_t;
typedef double ecs_f64_t;
typedef char* ecs_string_t;
 
/* Meta module component ids */
FLECS_API extern const ecs_entity_t ecs_id(EcsMetaType);
FLECS_API extern const ecs_entity_t ecs_id(EcsMetaTypeSerialized);
FLECS_API extern const ecs_entity_t ecs_id(EcsPrimitive);
FLECS_API extern const ecs_entity_t ecs_id(EcsEnum);
FLECS_API extern const ecs_entity_t ecs_id(EcsBitmask);
FLECS_API extern const ecs_entity_t ecs_id(EcsMember);
FLECS_API extern const ecs_entity_t ecs_id(EcsStruct);
FLECS_API extern const ecs_entity_t ecs_id(EcsArray);
FLECS_API extern const ecs_entity_t ecs_id(EcsVector);
FLECS_API extern const ecs_entity_t ecs_id(EcsOpaque);
FLECS_API extern const ecs_entity_t ecs_id(EcsUnit);
FLECS_API extern const ecs_entity_t ecs_id(EcsUnitPrefix);
FLECS_API extern const ecs_entity_t EcsConstant;
FLECS_API extern const ecs_entity_t EcsQuantity;
 
/* Primitive type component ids */
FLECS_API extern const ecs_entity_t ecs_id(ecs_bool_t);
FLECS_API extern const ecs_entity_t ecs_id(ecs_char_t);
FLECS_API extern const ecs_entity_t ecs_id(ecs_byte_t);
FLECS_API extern const ecs_entity_t ecs_id(ecs_u8_t);
FLECS_API extern const ecs_entity_t ecs_id(ecs_u16_t);
FLECS_API extern const ecs_entity_t ecs_id(ecs_u32_t);
FLECS_API extern const ecs_entity_t ecs_id(ecs_u64_t);
FLECS_API extern const ecs_entity_t ecs_id(ecs_uptr_t);
FLECS_API extern const ecs_entity_t ecs_id(ecs_i8_t);
FLECS_API extern const ecs_entity_t ecs_id(ecs_i16_t);
FLECS_API extern const ecs_entity_t ecs_id(ecs_i32_t);
FLECS_API extern const ecs_entity_t ecs_id(ecs_i64_t);
FLECS_API extern const ecs_entity_t ecs_id(ecs_iptr_t);
FLECS_API extern const ecs_entity_t ecs_id(ecs_f32_t);
FLECS_API extern const ecs_entity_t ecs_id(ecs_f64_t);
FLECS_API extern const ecs_entity_t ecs_id(ecs_string_t);
FLECS_API extern const ecs_entity_t ecs_id(ecs_entity_t);
 
typedef enum ecs_type_kind_t {
    EcsPrimitiveType,
    EcsBitmaskType,
    EcsEnumType,
    EcsStructType,
    EcsArrayType,
    EcsVectorType,
    EcsOpaqueType,
    EcsTypeKindLast = EcsOpaqueType
} ecs_type_kind_t;
 
typedef struct EcsMetaType {
    ecs_type_kind_t kind;
    bool existing;         
    bool partial;          
    ecs_size_t size;       
    ecs_size_t alignment;  
} EcsMetaType;
 
typedef enum ecs_primitive_kind_t {
    EcsBool = 1,
    EcsChar,
    EcsByte,
    EcsU8,
    EcsU16,
    EcsU32,
    EcsU64,
    EcsI8,
    EcsI16,
    EcsI32,
    EcsI64,
    EcsF32,
    EcsF64,
    EcsUPtr,
    EcsIPtr,
    EcsString,
    EcsEntity,
    EcsPrimitiveKindLast = EcsEntity
} ecs_primitive_kind_t;
 
typedef struct EcsPrimitive {
    ecs_primitive_kind_t kind;
} EcsPrimitive;
 
typedef struct EcsMember {
    ecs_entity_t type;
    int32_t count;
    ecs_entity_t unit;
    int32_t offset;
} EcsMember;
 
typedef struct ecs_member_t {
    const char *name;
    ecs_entity_t type;
 
    int32_t count;
    int32_t offset;
 
    ecs_entity_t unit;
 
    ecs_size_t size;
    ecs_entity_t member;
} ecs_member_t;
 
typedef struct EcsStruct {
    ecs_vec_t members; /* vector<ecs_member_t> */
} EcsStruct;
 
typedef struct ecs_enum_constant_t {
    const char *name;
 
    int32_t value;
 
    ecs_entity_t constant;
} ecs_enum_constant_t;
 
typedef struct EcsEnum {
    ecs_map_t constants; /* map<i32_t, ecs_enum_constant_t> */
} EcsEnum;
 
typedef struct ecs_bitmask_constant_t {
    const char *name;
 
    ecs_flags32_t value;
 
    ecs_entity_t constant;
} ecs_bitmask_constant_t;
 
typedef struct EcsBitmask {
    /* Populated from child entities with Constant component */
    ecs_map_t constants; /* map<u32_t, ecs_bitmask_constant_t> */
} EcsBitmask;
 
typedef struct EcsArray {
    ecs_entity_t type;
    int32_t count;
} EcsArray;
 
typedef struct EcsVector {
    ecs_entity_t type;
} EcsVector;
 
 
/* Opaque type support */
 
#if !defined(__cplusplus) || !defined(FLECS_CPP)
 
typedef struct ecs_serializer_t {
    /* Serialize value */
    int (*value)(
        const struct ecs_serializer_t *ser, 
        ecs_entity_t type,            
        const void *value);           
    /* Serialize member */
    int (*member)(
        const struct ecs_serializer_t *ser, 
        const char *member);           
    const ecs_world_t *world;
    void *ctx;
} ecs_serializer_t;
 
#elif defined(__cplusplus)
 
} /* extern "C" { */
 
typedef struct ecs_serializer_t {
    /* Serialize value */
    int (*value_)(
        const struct ecs_serializer_t *ser,
        ecs_entity_t type,
        const void *value);
 
    /* Serialize member */
    int (*member_)(
        const struct ecs_serializer_t *ser,
        const char *name);
 
    /* Serialize value */
    int value(ecs_entity_t type, const void *value) const;
    
    /* Serialize value */
    template <typename T>
    int value(const T& value) const;
 
    /* Serialize member */
    int member(const char *name) const;
 
    const ecs_world_t *world;
    void *ctx;
} ecs_serializer_t;
 
extern "C" {
#endif
 
typedef int (*ecs_meta_serialize_t)(
    const ecs_serializer_t *ser,
    const void *src);                  
typedef struct EcsOpaque {
    ecs_entity_t as_type;              
    ecs_meta_serialize_t serialize;    
    /* Deserializer interface 
     * Only override the callbacks that are valid for the opaque type. If a
     * deserializer attempts to assign a value type that is not supported by the
     * interface, a conversion error is thrown.
     */
 
    void (*assign_bool)(
        void *dst, 
        bool value);
 
    void (*assign_char)(
        void *dst, 
        char value);
 
    void (*assign_int)(
        void *dst, 
        int64_t value);
 
    void (*assign_uint)(
        void *dst, 
        uint64_t value);
 
    void (*assign_float)(
        void *dst, 
        double value);
 
    void (*assign_string)(
        void *dst, 
        const char *value);
 
    void (*assign_entity)(
        void *dst,
        ecs_world_t *world,
        ecs_entity_t entity);
 
    void (*assign_null)(
        void *dst);
 
    void (*clear)(
        void *dst);
 
    void* (*ensure_element)(
        void *dst, 
        size_t elem);
 
    void* (*ensure_member)(
        void *dst, 
        const char *member);
 
    size_t (*count)(
        const void *dst);
    
    void (*resize)(
        void *dst, 
        size_t count);
} EcsOpaque;
 
 
/* Units */
 
/* Helper type to describe translation between two units. Note that this
 * is not intended as a generic approach to unit conversions (e.g. from celsius
 * to fahrenheit) but to translate between units that derive from the same base 
 * (e.g. meters to kilometers). 
 * 
 * Note that power is applied to the factor. When describing a translation of
 * 1000, either use {factor = 1000, power = 1} or {factor = 1, power = 3}. */
typedef struct ecs_unit_translation_t {
    int32_t factor; 
    int32_t power;  
} ecs_unit_translation_t;
 
typedef struct EcsUnit {
    char *symbol;
    ecs_entity_t prefix; 
    ecs_entity_t base;   
    ecs_entity_t over;   
    ecs_unit_translation_t translation; 
} EcsUnit;
 
typedef struct EcsUnitPrefix {
    char *symbol;        
    ecs_unit_translation_t translation; 
} EcsUnitPrefix;
 
 
/* Serializer utilities */
 
typedef enum ecs_meta_type_op_kind_t {
    EcsOpArray,
    EcsOpVector,
    EcsOpOpaque,
    EcsOpPush,
    EcsOpPop,
 
    EcsOpScope, 
    EcsOpEnum,
    EcsOpBitmask,
 
    EcsOpPrimitive, 
    EcsOpBool,
    EcsOpChar,
    EcsOpByte,
    EcsOpU8,
    EcsOpU16,
    EcsOpU32,
    EcsOpU64,
    EcsOpI8,
    EcsOpI16,
    EcsOpI32,
    EcsOpI64,
    EcsOpF32,
    EcsOpF64,
    EcsOpUPtr,
    EcsOpIPtr,
    EcsOpString,
    EcsOpEntity,
    EcsMetaTypeOpKindLast = EcsOpEntity
} ecs_meta_type_op_kind_t;
 
typedef struct ecs_meta_type_op_t {
    ecs_meta_type_op_kind_t kind;
    ecs_size_t offset;      
    int32_t count;
    const char *name;       
    int32_t op_count;       
    ecs_size_t size;        
    ecs_entity_t type;
    ecs_entity_t unit;
    ecs_hashmap_t *members; 
} ecs_meta_type_op_t;
 
typedef struct EcsMetaTypeSerialized {
    ecs_vec_t ops;      
} EcsMetaTypeSerialized;
 
 
/* Deserializer utilities */
 
#define ECS_META_MAX_SCOPE_DEPTH (32) /* >32 levels of nesting is not sane */
 
typedef struct ecs_meta_scope_t {
    ecs_entity_t type;        
    ecs_meta_type_op_t *ops;  
    int32_t op_count;         
    int32_t op_cur;           
    int32_t elem_cur;         
    int32_t prev_depth;       
    void *ptr;                
    const EcsComponent *comp; 
    const EcsOpaque *opaque;  
    ecs_vec_t *vector;    
    ecs_hashmap_t *members;   
    bool is_collection;       
    bool is_inline_array;     
    bool is_empty_scope;      
} ecs_meta_scope_t;
 
typedef struct ecs_meta_cursor_t {
    const ecs_world_t *world;
    ecs_meta_scope_t scope[ECS_META_MAX_SCOPE_DEPTH];
    int32_t depth;
    bool valid;
    bool is_primitive_scope;  
    /* Custom entity lookup action for overriding default ecs_lookup_fullpath */
    ecs_entity_t (*lookup_action)(const ecs_world_t*, const char*, void*);
    void *lookup_ctx;
} ecs_meta_cursor_t;
 
FLECS_API
ecs_meta_cursor_t ecs_meta_cursor(
    const ecs_world_t *world,
    ecs_entity_t type,
    void *ptr);
 
FLECS_API
void* ecs_meta_get_ptr(
    ecs_meta_cursor_t *cursor);
 
FLECS_API
int ecs_meta_next(
    ecs_meta_cursor_t *cursor);
 
FLECS_API
int ecs_meta_elem(
    ecs_meta_cursor_t *cursor,
    int32_t elem);
 
FLECS_API
int ecs_meta_member(
    ecs_meta_cursor_t *cursor,
    const char *name);
 
FLECS_API
int ecs_meta_dotmember(
    ecs_meta_cursor_t *cursor,
    const char *name);
 
FLECS_API
int ecs_meta_push(
    ecs_meta_cursor_t *cursor);
 
FLECS_API
int ecs_meta_pop(
    ecs_meta_cursor_t *cursor);
 
FLECS_API
bool ecs_meta_is_collection(
    const ecs_meta_cursor_t *cursor);
 
FLECS_API
ecs_entity_t ecs_meta_get_type(
    const ecs_meta_cursor_t *cursor);
 
FLECS_API
ecs_entity_t ecs_meta_get_unit(
    const ecs_meta_cursor_t *cursor);
 
FLECS_API
const char* ecs_meta_get_member(
    const ecs_meta_cursor_t *cursor);
 
/* The set functions assign the field with the specified value. If the value
 * does not have the same type as the field, it will be cased to the field type.
 * If no valid conversion is available, the operation will fail. */
 
FLECS_API
int ecs_meta_set_bool(
    ecs_meta_cursor_t *cursor,
    bool value);
 
FLECS_API
int ecs_meta_set_char(
    ecs_meta_cursor_t *cursor,
    char value);
 
FLECS_API
int ecs_meta_set_int(
    ecs_meta_cursor_t *cursor,
    int64_t value);
 
FLECS_API
int ecs_meta_set_uint(
    ecs_meta_cursor_t *cursor,
    uint64_t value);
 
FLECS_API
int ecs_meta_set_float(
    ecs_meta_cursor_t *cursor,
    double value);
 
FLECS_API
int ecs_meta_set_string(
    ecs_meta_cursor_t *cursor,
    const char *value);
 
FLECS_API
int ecs_meta_set_string_literal(
    ecs_meta_cursor_t *cursor,
    const char *value);
 
FLECS_API
int ecs_meta_set_entity(
    ecs_meta_cursor_t *cursor,
    ecs_entity_t value);
 
FLECS_API
int ecs_meta_set_null(
    ecs_meta_cursor_t *cursor);
 
FLECS_API
int ecs_meta_set_value(
    ecs_meta_cursor_t *cursor,
    const ecs_value_t *value);
 
/* Functions for getting members. */
 
FLECS_API
bool ecs_meta_get_bool(
    const ecs_meta_cursor_t *cursor);
 
FLECS_API
char ecs_meta_get_char(
    const ecs_meta_cursor_t *cursor);
 
FLECS_API
int64_t ecs_meta_get_int(
    const ecs_meta_cursor_t *cursor);
 
FLECS_API
uint64_t ecs_meta_get_uint(
    const ecs_meta_cursor_t *cursor);
 
FLECS_API
double ecs_meta_get_float(
    const ecs_meta_cursor_t *cursor);
 
FLECS_API
const char* ecs_meta_get_string(
    const ecs_meta_cursor_t *cursor);
 
FLECS_API
ecs_entity_t ecs_meta_get_entity(
    const ecs_meta_cursor_t *cursor);
 
FLECS_API
double ecs_meta_ptr_to_float(
    ecs_primitive_kind_t type_kind,
    const void *ptr);
 
/* API functions for creating meta types */
 
typedef struct ecs_primitive_desc_t {
    ecs_entity_t entity; 
    ecs_primitive_kind_t kind;
} ecs_primitive_desc_t;
 
FLECS_API
ecs_entity_t ecs_primitive_init(
    ecs_world_t *world,
    const ecs_primitive_desc_t *desc);
 
typedef struct ecs_enum_desc_t {
    ecs_entity_t entity; 
    ecs_enum_constant_t constants[ECS_MEMBER_DESC_CACHE_SIZE];
} ecs_enum_desc_t;
 
FLECS_API
ecs_entity_t ecs_enum_init(
    ecs_world_t *world,
    const ecs_enum_desc_t *desc);
 
 
typedef struct ecs_bitmask_desc_t {
    ecs_entity_t entity; 
    ecs_bitmask_constant_t constants[ECS_MEMBER_DESC_CACHE_SIZE];
} ecs_bitmask_desc_t;
 
FLECS_API
ecs_entity_t ecs_bitmask_init(
    ecs_world_t *world,
    const ecs_bitmask_desc_t *desc);
 
 
typedef struct ecs_array_desc_t {
    ecs_entity_t entity; 
    ecs_entity_t type;
    int32_t count;
} ecs_array_desc_t;
 
FLECS_API
ecs_entity_t ecs_array_init(
    ecs_world_t *world,
    const ecs_array_desc_t *desc);
 
 
typedef struct ecs_vector_desc_t {
    ecs_entity_t entity; 
    ecs_entity_t type;
} ecs_vector_desc_t;
 
FLECS_API
ecs_entity_t ecs_vector_init(
    ecs_world_t *world,
    const ecs_vector_desc_t *desc);
 
 
typedef struct ecs_struct_desc_t {
    ecs_entity_t entity; 
    ecs_member_t members[ECS_MEMBER_DESC_CACHE_SIZE];
} ecs_struct_desc_t;
 
FLECS_API
ecs_entity_t ecs_struct_init(
    ecs_world_t *world,
    const ecs_struct_desc_t *desc);
 
typedef struct ecs_opaque_desc_t {
    ecs_entity_t entity;
    EcsOpaque type;
} ecs_opaque_desc_t;
 
FLECS_API
ecs_entity_t ecs_opaque_init(
    ecs_world_t *world,
    const ecs_opaque_desc_t *desc);
 
typedef struct ecs_unit_desc_t {
    ecs_entity_t entity;
 
    const char *symbol;
 
    ecs_entity_t quantity;
 
    ecs_entity_t base;
 
    ecs_entity_t over;
 
    ecs_unit_translation_t translation;
 
    ecs_entity_t prefix;
} ecs_unit_desc_t;
 
FLECS_API
ecs_entity_t ecs_unit_init(
    ecs_world_t *world,
    const ecs_unit_desc_t *desc);
 
typedef struct ecs_unit_prefix_desc_t {
    ecs_entity_t entity;
 
    const char *symbol;
 
    ecs_unit_translation_t translation;
} ecs_unit_prefix_desc_t;
 
FLECS_API
ecs_entity_t ecs_unit_prefix_init(
    ecs_world_t *world,
    const ecs_unit_prefix_desc_t *desc);
 
FLECS_API
ecs_entity_t ecs_quantity_init(
    ecs_world_t *world,
    const ecs_entity_desc_t *desc);
 
/* Convenience macros */
 
#define ecs_primitive(world, ...)\
    ecs_primitive_init(world, &(ecs_primitive_desc_t) __VA_ARGS__ )
 
#define ecs_enum(world, ...)\
    ecs_enum_init(world, &(ecs_enum_desc_t) __VA_ARGS__ )
 
#define ecs_bitmask(world, ...)\
    ecs_bitmask_init(world, &(ecs_bitmask_desc_t) __VA_ARGS__ )
 
#define ecs_array(world, ...)\
    ecs_array_init(world, &(ecs_array_desc_t) __VA_ARGS__ )
 
#define ecs_vector(world, ...)\
    ecs_vector_init(world, &(ecs_vector_desc_t) __VA_ARGS__ )
 
#define ecs_opaque(world, ...)\
    ecs_opaque_init(world, &(ecs_opaque_desc_t) __VA_ARGS__ )
 
#define ecs_struct(world, ...)\
    ecs_struct_init(world, &(ecs_struct_desc_t) __VA_ARGS__ )
 
#define ecs_unit(world, ...)\
    ecs_unit_init(world, &(ecs_unit_desc_t) __VA_ARGS__ )
 
#define ecs_unit_prefix(world, ...)\
    ecs_unit_prefix_init(world, &(ecs_unit_prefix_desc_t) __VA_ARGS__ )
 
#define ecs_quantity(world, ...)\
    ecs_quantity_init(world, &(ecs_entity_desc_t) __VA_ARGS__ )
 
/* Module import */
FLECS_API
void FlecsMetaImport(
    ecs_world_t *world);
 
#ifdef __cplusplus
}
#endif
 
#endif
 
#endif