Flecs
v4.0
A fast entity component system (ECS) for C & C++
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flecs_c.h
Go to the documentation of this file.
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#ifndef FLECS_C_
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#define FLECS_C_
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24
/* Use for declaring entity, tag, prefab / any other entity identifier */
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#define ECS_DECLARE(id)\
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ecs_entity_t id, ecs_id(id)
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#define ECS_ENTITY_DECLARE ECS_DECLARE
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#define ECS_ENTITY_DEFINE(world, id_, ...) \
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{ \
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ecs_entity_desc_t desc = {0}; \
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desc.id = id_; \
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desc.name = #id_; \
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desc.add_expr = #__VA_ARGS__; \
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id_ = ecs_entity_init(world, &desc); \
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ecs_id(id_) = id_; \
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ecs_assert(id_ != 0, ECS_INVALID_PARAMETER, "failed to create entity %s", #id_); \
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} \
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(void)id_; \
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(void)ecs_id(id_)
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#define ECS_ENTITY(world, id, ...) \
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ecs_entity_t ecs_id(id); \
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ecs_entity_t id = 0; \
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ECS_ENTITY_DEFINE(world, id, __VA_ARGS__)
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#define ECS_TAG_DECLARE ECS_DECLARE
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#define ECS_TAG_DEFINE(world, id) ECS_ENTITY_DEFINE(world, id, 0)
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#define ECS_TAG(world, id) ECS_ENTITY(world, id, 0)
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#define ECS_PREFAB_DECLARE ECS_DECLARE
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#define ECS_PREFAB_DEFINE(world, id, ...) ECS_ENTITY_DEFINE(world, id, Prefab, __VA_ARGS__)
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#define ECS_PREFAB(world, id, ...) ECS_ENTITY(world, id, Prefab, __VA_ARGS__)
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#define ECS_COMPONENT_DECLARE(id) ecs_entity_t ecs_id(id)
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#define ECS_COMPONENT_DEFINE(world, id_) \
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{\
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ecs_component_desc_t desc = {0}; \
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ecs_entity_desc_t edesc = {0}; \
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edesc.id = ecs_id(id_); \
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edesc.use_low_id = true; \
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edesc.name = #id_; \
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edesc.symbol = #id_; \
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desc.entity = ecs_entity_init(world, &edesc); \
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desc.type.size = ECS_SIZEOF(id_); \
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desc.type.alignment = ECS_ALIGNOF(id_); \
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ecs_id(id_) = ecs_component_init(world, &desc);\
134
}\
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ecs_assert(ecs_id(id_) != 0, ECS_INVALID_PARAMETER, "failed to create component %s", #id_)
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#define ECS_COMPONENT(world, id)\
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ecs_entity_t ecs_id(id) = 0;\
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ECS_COMPONENT_DEFINE(world, id);\
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(void)ecs_id(id)
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/* Forward declare an observer. */
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#define ECS_OBSERVER_DECLARE(id) ecs_entity_t ecs_id(id)
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#define ECS_OBSERVER_DEFINE(world, id_, kind, ...)\
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{\
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ecs_observer_desc_t desc = {0};\
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ecs_entity_desc_t edesc = {0}; \
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edesc.id = ecs_id(id_); \
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edesc.name = #id_; \
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desc.entity = ecs_entity_init(world, &edesc); \
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desc.callback = id_;\
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desc.query.expr = #__VA_ARGS__;\
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desc.events[0] = kind;\
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ecs_id(id_) = ecs_observer_init(world, &desc);\
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ecs_assert(ecs_id(id_) != 0, ECS_INVALID_PARAMETER, "failed to create observer %s", #id_);\
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}
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#define ECS_OBSERVER(world, id, kind, ...)\
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ecs_entity_t ecs_id(id) = 0; \
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ECS_OBSERVER_DEFINE(world, id, kind, __VA_ARGS__);\
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ecs_entity_t id = ecs_id(id);\
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(void)ecs_id(id);\
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(void)id
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/* Forward declare a query. */
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#define ECS_QUERY_DECLARE(name) ecs_query_t* name
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#define ECS_QUERY_DEFINE(world, name_, ...)\
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{\
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ecs_query_desc_t desc = {0};\
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ecs_entity_desc_t edesc = {0}; \
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edesc.name = #name_; \
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desc.entity = ecs_entity_init(world, &edesc); \
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desc.expr = #__VA_ARGS__;\
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name_ = ecs_query_init(world, &desc);\
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ecs_assert(name_ != NULL, ECS_INVALID_PARAMETER, "failed to create query %s", #name_);\
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}
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#define ECS_QUERY(world, name, ...)\
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ecs_query_t* name = NULL; \
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ECS_QUERY_DEFINE(world, name, __VA_ARGS__);\
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(void)name
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#define ecs_entity(world, ...)\
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ecs_entity_init(world, &(ecs_entity_desc_t) __VA_ARGS__ )
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#define ecs_component(world, ...)\
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ecs_component_init(world, &(ecs_component_desc_t) __VA_ARGS__ )
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#define ecs_query(world, ...)\
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ecs_query_init(world, &(ecs_query_desc_t) __VA_ARGS__ )
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#define ecs_observer(world, ...)\
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ecs_observer_init(world, &(ecs_observer_desc_t) __VA_ARGS__ )
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#define ecs_new_w(world, T) ecs_new_w_id(world, ecs_id(T))
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#define ecs_new_w_pair(world, first, second)\
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ecs_new_w_id(world, ecs_pair(first, second))
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#define ecs_bulk_new(world, component, count)\
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ecs_bulk_new_w_id(world, ecs_id(component), count)
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#define ecs_add(world, entity, T)\
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ecs_add_id(world, entity, ecs_id(T))
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#define ecs_add_pair(world, subject, first, second)\
315
ecs_add_id(world, subject, ecs_pair(first, second))
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#define ecs_remove(world, entity, T)\
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ecs_remove_id(world, entity, ecs_id(T))
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#define ecs_remove_pair(world, subject, first, second)\
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ecs_remove_id(world, subject, ecs_pair(first, second))
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#define ecs_auto_override(world, entity, T)\
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ecs_auto_override_id(world, entity, ecs_id(T))
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#define ecs_auto_override_pair(world, subject, first, second)\
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ecs_auto_override_id(world, subject, ecs_pair(first, second))
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/* insert */
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#define ecs_insert(world, ...)\
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ecs_entity(world, { .set = ecs_values(__VA_ARGS__)})
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/* set */
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#define ecs_set_ptr(world, entity, component, ptr)\
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ecs_set_id(world, entity, ecs_id(component), sizeof(component), ptr)
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#define ecs_set(world, entity, component, ...)\
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ecs_set_id(world, entity, ecs_id(component), sizeof(component), &(component)__VA_ARGS__)
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#define ecs_set_pair(world, subject, First, second, ...)\
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ecs_set_id(world, subject,\
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ecs_pair(ecs_id(First), second),\
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sizeof(First), &(First)__VA_ARGS__)
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#define ecs_set_pair_second(world, subject, first, Second, ...)\
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ecs_set_id(world, subject,\
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ecs_pair(first, ecs_id(Second)),\
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sizeof(Second), &(Second)__VA_ARGS__)
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#define ecs_set_override(world, entity, T, ...)\
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ecs_add_id(world, entity, ECS_AUTO_OVERRIDE | ecs_id(T));\
362
ecs_set(world, entity, T, __VA_ARGS__)
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/* emplace */
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#define ecs_emplace(world, entity, T, is_new)\
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(ECS_CAST(T*, ecs_emplace_id(world, entity, ecs_id(T), sizeof(T), is_new)))
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#define ecs_emplace_pair(world, entity, First, second, is_new)\
370
(ECS_CAST(First*, ecs_emplace_id(world, entity, ecs_pair_t(First, second), sizeof(First), is_new)))
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/* get */
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#define ecs_get(world, entity, T)\
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(ECS_CAST(const T*, ecs_get_id(world, entity, ecs_id(T))))
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#define ecs_get_pair(world, subject, First, second)\
378
(ECS_CAST(const First*, ecs_get_id(world, subject,\
379
ecs_pair(ecs_id(First), second))))
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381
#define ecs_get_pair_second(world, subject, first, Second)\
382
(ECS_CAST(const Second*, ecs_get_id(world, subject,\
383
ecs_pair(first, ecs_id(Second)))))
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/* get_mut */
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#define ecs_get_mut(world, entity, T)\
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(ECS_CAST(T*, ecs_get_mut_id(world, entity, ecs_id(T))))
389
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#define ecs_get_mut_pair(world, subject, First, second)\
391
(ECS_CAST(First*, ecs_get_mut_id(world, subject,\
392
ecs_pair(ecs_id(First), second))))
393
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#define ecs_get_mut_pair_second(world, subject, first, Second)\
395
(ECS_CAST(Second*, ecs_get_mut_id(world, subject,\
396
ecs_pair(first, ecs_id(Second)))))
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#define ecs_get_mut(world, entity, T)\
399
(ECS_CAST(T*, ecs_get_mut_id(world, entity, ecs_id(T))))
400
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/* ensure */
402
403
#define ecs_ensure(world, entity, T)\
404
(ECS_CAST(T*, ecs_ensure_id(world, entity, ecs_id(T), sizeof(T))))
405
406
#define ecs_ensure_pair(world, subject, First, second)\
407
(ECS_CAST(First*, ecs_ensure_id(world, subject,\
408
ecs_pair(ecs_id(First), second), sizeof(First))))
409
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#define ecs_ensure_pair_second(world, subject, first, Second)\
411
(ECS_CAST(Second*, ecs_ensure_id(world, subject,\
412
ecs_pair(first, ecs_id(Second)), sizeof(Second))))
413
414
/* modified */
415
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#define ecs_modified(world, entity, component)\
417
ecs_modified_id(world, entity, ecs_id(component))
418
419
#define ecs_modified_pair(world, subject, first, second)\
420
ecs_modified_id(world, subject, ecs_pair(first, second))
421
422
/* record */
423
424
#define ecs_record_get(world, record, T)\
425
(ECS_CAST(const T*, ecs_record_get_id(world, record, ecs_id(T))))
426
427
#define ecs_record_has(world, record, T)\
428
(ecs_record_has_id(world, record, ecs_id(T)))
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430
#define ecs_record_get_pair(world, record, First, second)\
431
(ECS_CAST(const First*, ecs_record_get_id(world, record, \
432
ecs_pair(ecs_id(First), second))))
433
434
#define ecs_record_get_pair_second(world, record, first, Second)\
435
(ECS_CAST(const Second*, ecs_record_get_id(world, record,\
436
ecs_pair(first, ecs_id(Second)))))
437
438
#define ecs_record_ensure(world, record, T)\
439
(ECS_CAST(T*, ecs_record_ensure_id(world, record, ecs_id(T))))
440
441
#define ecs_record_ensure_pair(world, record, First, second)\
442
(ECS_CAST(First*, ecs_record_ensure_id(world, record, \
443
ecs_pair(ecs_id(First), second))))
444
445
#define ecs_record_ensure_pair_second(world, record, first, Second)\
446
(ECS_CAST(Second*, ecs_record_ensure_id(world, record,\
447
ecs_pair(first, ecs_id(Second)))))
448
449
#define ecs_ref_init(world, entity, T)\
450
ecs_ref_init_id(world, entity, ecs_id(T))
451
452
#define ecs_ref_get(world, ref, T)\
453
(ECS_CAST(T*, ecs_ref_get_id(world, ref, ecs_id(T))))
454
462
#define ecs_singleton_add(world, comp)\
463
ecs_add(world, ecs_id(comp), comp)
464
465
#define ecs_singleton_remove(world, comp)\
466
ecs_remove(world, ecs_id(comp), comp)
467
468
#define ecs_singleton_get(world, comp)\
469
ecs_get(world, ecs_id(comp), comp)
470
471
#define ecs_singleton_get_mut(world, comp)\
472
ecs_get_mut(world, ecs_id(comp), comp)
473
474
#define ecs_singleton_set_ptr(world, comp, ptr)\
475
ecs_set_ptr(world, ecs_id(comp), comp, ptr)
476
477
#define ecs_singleton_set(world, comp, ...)\
478
ecs_set(world, ecs_id(comp), comp, __VA_ARGS__)
479
480
#define ecs_singleton_ensure(world, comp)\
481
ecs_ensure(world, ecs_id(comp), comp)
482
483
#define ecs_singleton_emplace(world, comp, is_new)\
484
ecs_emplace(world, ecs_id(comp), comp, is_new)
485
486
#define ecs_singleton_modified(world, comp)\
487
ecs_modified(world, ecs_id(comp), comp)
488
496
#define ecs_has(world, entity, T)\
497
ecs_has_id(world, entity, ecs_id(T))
498
499
#define ecs_has_pair(world, entity, first, second)\
500
ecs_has_id(world, entity, ecs_pair(first, second))
501
502
#define ecs_owns_pair(world, entity, first, second)\
503
ecs_owns_id(world, entity, ecs_pair(first, second))
504
505
#define ecs_owns(world, entity, T)\
506
ecs_owns_id(world, entity, ecs_id(T))
507
508
#define ecs_shares_id(world, entity, id)\
509
(ecs_search_relation(world, ecs_get_table(world, entity), 0, ecs_id(id), \
510
EcsIsA, 1, 0, 0, 0, 0) != -1)
511
512
#define ecs_shares_pair(world, entity, first, second)\
513
(ecs_shares_id(world, entity, ecs_pair(first, second)))
514
515
#define ecs_shares(world, entity, T)\
516
(ecs_shares_id(world, entity, ecs_id(T)))
517
518
#define ecs_get_target_for(world, entity, rel, T)\
519
ecs_get_target_for_id(world, entity, rel, ecs_id(T))
520
528
#define ecs_enable_component(world, entity, T, enable)\
529
ecs_enable_id(world, entity, ecs_id(T), enable)
530
531
#define ecs_is_enabled(world, entity, T)\
532
ecs_is_enabled_id(world, entity, ecs_id(T))
533
534
#define ecs_enable_pair(world, entity, First, second, enable)\
535
ecs_enable_id(world, entity, ecs_pair(ecs_id(First), second), enable)
536
537
#define ecs_is_enabled_pair(world, entity, First, second)\
538
ecs_is_enabled_id(world, entity, ecs_pair(ecs_id(First), second))
539
547
#define ecs_lookup_from(world, parent, path)\
548
ecs_lookup_path_w_sep(world, parent, path, ".", NULL, true)
549
550
#define ecs_get_path_from(world, parent, child)\
551
ecs_get_path_w_sep(world, parent, child, ".", NULL)
552
553
#define ecs_get_path(world, child)\
554
ecs_get_path_w_sep(world, 0, child, ".", NULL)
555
556
#define ecs_get_path_buf(world, child, buf)\
557
ecs_get_path_w_sep_buf(world, 0, child, ".", NULL, buf, false)
558
559
#define ecs_new_from_path(world, parent, path)\
560
ecs_new_from_path_w_sep(world, parent, path, ".", NULL)
561
562
#define ecs_add_path(world, entity, parent, path)\
563
ecs_add_path_w_sep(world, entity, parent, path, ".", NULL)
564
565
#define ecs_add_fullpath(world, entity, path)\
566
ecs_add_path_w_sep(world, entity, 0, path, ".", NULL)
567
577
#define ecs_set_hooks(world, T, ...)\
578
ecs_set_hooks_id(world, ecs_id(T), &(ecs_type_hooks_t)__VA_ARGS__)
579
580
#define ecs_get_hooks(world, T)\
581
ecs_get_hooks_id(world, ecs_id(T));
582
590
#define ECS_CTOR(type, var, ...)\
591
ECS_XTOR_IMPL(type, ctor, var, __VA_ARGS__)
592
600
#define ECS_DTOR(type, var, ...)\
601
ECS_XTOR_IMPL(type, dtor, var, __VA_ARGS__)
602
610
#define ECS_COPY(type, dst_var, src_var, ...)\
611
ECS_COPY_IMPL(type, dst_var, src_var, __VA_ARGS__)
612
620
#define ECS_MOVE(type, dst_var, src_var, ...)\
621
ECS_MOVE_IMPL(type, dst_var, src_var, __VA_ARGS__)
622
630
#define ECS_ON_ADD(type, ptr, ...)\
631
ECS_HOOK_IMPL(type, ecs_on_add(type), ptr, __VA_ARGS__)
632
#define ECS_ON_REMOVE(type, ptr, ...)\
633
ECS_HOOK_IMPL(type, ecs_on_remove(type), ptr, __VA_ARGS__)
634
#define ECS_ON_SET(type, ptr, ...)\
635
ECS_HOOK_IMPL(type, ecs_on_set(type), ptr, __VA_ARGS__)
636
637
/* Map from typename to function name of component lifecycle action */
638
#define ecs_ctor(type) type##_ctor
639
#define ecs_dtor(type) type##_dtor
640
#define ecs_copy(type) type##_copy
641
#define ecs_move(type) type##_move
642
#define ecs_on_set(type) type##_on_set
643
#define ecs_on_add(type) type##_on_add
644
#define ecs_on_remove(type) type##_on_remove
645
653
#define ecs_count(world, type)\
654
ecs_count_id(world, ecs_id(type))
655
663
#define ecs_field(it, T, index)\
664
(ECS_CAST(T*, ecs_field_w_size(it, sizeof(T), index)))
665
666
#define ecs_field_self(it, T, index)\
667
(ECS_CAST(T*, ecs_field_self_w_size(it, sizeof(T), index)))
668
669
#define ecs_field_at(it, T, index, row)\
670
(ECS_CAST(T*, ecs_field_at_w_size(it, sizeof(T), index, row)))
671
679
#define ecs_table_get(world, table, T, offset)\
680
(ECS_CAST(T*, ecs_table_get_id(world, table, ecs_id(T), offset)))
681
682
#define ecs_table_get_pair(world, table, First, second, offset)\
683
(ECS_CAST(First*, ecs_table_get_id(world, table, ecs_pair(ecs_id(First), second), offset)))
684
685
#define ecs_table_get_pair_second(world, table, first, Second, offset)\
686
(ECS_CAST(Second*, ecs_table_get_id(world, table, ecs_pair(first, ecs_id(Second)), offset)))
687
696
#define ecs_ids(...) (ecs_id_t[]){ __VA_ARGS__, 0 }
697
699
#define ecs_values(...) (ecs_value_t[]){ __VA_ARGS__, {0, 0}}
700
702
#define ecs_value_ptr(T, ptr) ((ecs_value_t){ecs_id(T), ptr})
703
705
#define ecs_value_pair(R, t, ...) ((ecs_value_t){ecs_pair_t(R, t), &(R)__VA_ARGS__})
706
708
#define ecs_value_pair_2nd(r, T, ...) ((ecs_value_t){ecs_pair(r, ecs_id(T)), &(T)__VA_ARGS__})
709
711
#define ecs_value_new_t(world, T) ecs_value_new(world, ecs_id(T))
712
714
#define ecs_value(T, ...) ((ecs_value_t){ecs_id(T), &(T)__VA_ARGS__})
715
726
#define ecs_sort_table(id) ecs_id(id##_sort_table)
727
728
#define ecs_compare(id) ecs_id(id##_compare_fn)
729
730
/* Declare efficient table sorting operation that uses provided compare function.
731
* For best results use LTO or make the function body visible in the same compilation unit.
732
* Variadic arguments are prepended before generated functions, use it to declare static
733
* or exported functions.
734
* Parameters of the comparison function:
735
* ecs_entity_t e1, const void* ptr1,
736
* ecs_entity_t e2, const void* ptr2
737
* Parameters of the sort functions:
738
* ecs_world_t *world
739
* ecs_table_t *table
740
* ecs_entity_t *entities
741
* void *ptr
742
* int32_t elem_size
743
* int32_t lo
744
* int32_t hi
745
* ecs_order_by_action_t order_by - Pointer to the original comparison function. You are not supposed to use it.
746
* Example:
747
*
748
* @code
749
* int CompareMyType(ecs_entity_t e1, const void* ptr1, ecs_entity_t e2, const void* ptr2) { const MyType* p1 = ptr1; const MyType* p2 = ptr2; return p1->value - p2->value; }
750
* ECS_SORT_TABLE_WITH_COMPARE(MyType, MyCustomCompare, CompareMyType)
751
* @endcode
752
*/
753
#define ECS_SORT_TABLE_WITH_COMPARE(id, op_name, compare_fn, ...) \
754
static int32_t ECS_CONCAT(op_name, _partition)( \
755
ecs_world_t *world, \
756
ecs_table_t *table, \
757
ecs_entity_t *entities, \
758
void *ptr, \
759
int32_t elem_size, \
760
int32_t lo, \
761
int32_t hi, \
762
ecs_order_by_action_t order_by) \
763
{ \
764
(void)(order_by); \
765
int32_t p = (hi + lo) / 2; \
766
void *pivot = ECS_ELEM(ptr, elem_size, p); \
767
ecs_entity_t pivot_e = entities[p]; \
768
int32_t i = lo - 1, j = hi + 1; \
769
void *el; \
770
repeat: \
771
{ \
772
do { \
773
i ++; \
774
el = ECS_ELEM(ptr, elem_size, i); \
775
} while ( compare_fn(entities[i], el, pivot_e, pivot) < 0); \
776
do { \
777
j --; \
778
el = ECS_ELEM(ptr, elem_size, j); \
779
} while ( compare_fn(entities[j], el, pivot_e, pivot) > 0); \
780
if (i >= j) { \
781
return j; \
782
} \
783
ecs_table_swap_rows(world, table, i, j); \
784
if (p == i) { \
785
pivot = ECS_ELEM(ptr, elem_size, j); \
786
pivot_e = entities[j]; \
787
} else if (p == j) { \
788
pivot = ECS_ELEM(ptr, elem_size, i); \
789
pivot_e = entities[i]; \
790
} \
791
goto repeat; \
792
} \
793
} \
794
__VA_ARGS__ void op_name( \
795
ecs_world_t *world, \
796
ecs_table_t *table, \
797
ecs_entity_t *entities, \
798
void *ptr, \
799
int32_t size, \
800
int32_t lo, \
801
int32_t hi, \
802
ecs_order_by_action_t order_by) \
803
{ \
804
if ((hi - lo) < 1) { \
805
return; \
806
} \
807
int32_t p = ECS_CONCAT(op_name, _partition)(world, table, entities, ptr, size, lo, hi, order_by); \
808
op_name(world, table, entities, ptr, size, lo, p, order_by); \
809
op_name(world, table, entities, ptr, size, p + 1, hi, order_by); \
810
}
811
812
/* Declare efficient table sorting operation that uses default component comparison operator.
813
* For best results use LTO or make the comparison operator visible in the same compilation unit.
814
* Variadic arguments are prepended before generated functions, use it to declare static
815
* or exported functions.
816
* Example:
817
*
818
* @code
819
* ECS_COMPARE(MyType, { const MyType* p1 = ptr1; const MyType* p2 = ptr2; return p1->value - p2->value; });
820
* ECS_SORT_TABLE(MyType)
821
* @endcode
822
*/
823
#define ECS_SORT_TABLE(id, ...) \
824
ECS_SORT_TABLE_WITH_COMPARE(id, ecs_sort_table(id), ecs_compare(id), __VA_ARGS__)
825
826
/* Declare component comparison operations.
827
* Parameters:
828
* ecs_entity_t e1, const void* ptr1,
829
* ecs_entity_t e2, const void* ptr2
830
* Example:
831
*
832
* @code
833
* ECS_COMPARE(MyType, { const MyType* p1 = ptr1; const MyType* p2 = ptr2; return p1->value - p2->value; });
834
* @endcode
835
*/
836
#define ECS_COMPARE(id, ...) \
837
int ecs_compare(id)(ecs_entity_t e1, const void* ptr1, ecs_entity_t e2, const void* ptr2) { \
838
__VA_ARGS__ \
839
}
840
850
#define ecs_isa(e) ecs_pair(EcsIsA, e)
851
#define ecs_childof(e) ecs_pair(EcsChildOf, e)
852
#define ecs_dependson(e) ecs_pair(EcsDependsOn, e)
853
#define ecs_with(e) ecs_pair(EcsWith, e)
854
855
#define ecs_each(world, id) ecs_each_id(world, ecs_id(id))
856
#define ecs_each_pair(world, r, t) ecs_each_id(world, ecs_pair(r, t))
857
#define ecs_each_pair_t(world, R, t) ecs_each_id(world, ecs_pair(ecs_id(R), t))
858
863
#endif
// FLECS_C_