Flecs
v3.2
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_
7
#define FLECS_C_
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23
/* Use for declaring entity, tag, prefab / any other entity identifier */
24
#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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35
#define ECS_ENTITY_DEFINE(world, id_, ...) \
36
{ \
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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, NULL); \
44
} \
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(void)id_; \
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(void)ecs_id(id_);
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53
#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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66
#define ECS_TAG_DEFINE(world, id) ECS_ENTITY_DEFINE(world, id, 0)
67
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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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83
#define ECS_PREFAB_DEFINE(world, id, ...) ECS_ENTITY_DEFINE(world, id, Prefab, __VA_ARGS__)
84
90
#define ECS_PREFAB(world, id, ...) ECS_ENTITY(world, id, Prefab, __VA_ARGS__)
91
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#define ECS_COMPONENT_DECLARE(id) ecs_entity_t ecs_id(id)
94
100
#define ECS_COMPONENT_DEFINE(world, id_) \
101
{\
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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_); \
111
ecs_id(id_) = ecs_component_init(world, &desc);\
112
ecs_assert(ecs_id(id_) != 0, ECS_INVALID_PARAMETER, NULL);\
113
}
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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)
124
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/* Forward declare an observer. */
126
#define ECS_OBSERVER_DECLARE(id) ecs_entity_t ecs_id(id)
127
133
#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.filter.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, NULL);\
145
}
146
152
#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);\
156
(void)ecs_id(id);\
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(void)id;
158
166
#define ecs_entity(world, ...)\
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ecs_entity_init(world, &(ecs_entity_desc_t) __VA_ARGS__ )
168
177
#define ecs_component(world, ...)\
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ecs_component_init(world, &(ecs_component_desc_t) __VA_ARGS__ )
179
185
#define ecs_component_t(world, T)\
186
ecs_component_init(world, &(ecs_component_desc_t) { \
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.entity = ecs_entity(world, { \
188
.name = #T, \
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.symbol = #T, \
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.use_low_id = true \
191
}), \
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.type.size = ECS_SIZEOF(T), \
193
.type.alignment = ECS_ALIGNOF(T) \
194
})
195
203
#define ecs_filter(world, ...)\
204
ecs_filter_init(world, &(ecs_filter_desc_t) __VA_ARGS__ )
205
213
#define ecs_query(world, ...)\
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ecs_query_init(world, &(ecs_query_desc_t) __VA_ARGS__ )
215
225
#define ecs_observer(world, ...)\
226
ecs_observer_init(world, &(ecs_observer_desc_t) __VA_ARGS__ )
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#define ecs_new(world, T) ecs_new_w_id(world, ecs_id(T))
247
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#define ecs_new_w_pair(world, first, second)\
249
ecs_new_w_id(world, ecs_pair(first, second))
250
251
#define ecs_bulk_new(world, component, count)\
252
ecs_bulk_new_w_id(world, ecs_id(component), count)
253
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#define ecs_new_entity(world, n)\
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ecs_entity_init(world, &(ecs_entity_desc_t){\
256
.name = n,\
257
})
258
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#define ecs_new_prefab(world, n)\
260
ecs_entity_init(world, &(ecs_entity_desc_t){\
261
.name = n,\
262
.add = {EcsPrefab}\
263
})
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#define ecs_delete_children(world, parent)\
266
ecs_delete_with(world, ecs_pair(EcsChildOf, parent))
267
275
#define ecs_add(world, entity, T)\
276
ecs_add_id(world, entity, ecs_id(T))
277
278
#define ecs_add_pair(world, subject, first, second)\
279
ecs_add_id(world, subject, ecs_pair(first, second))
280
281
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#define ecs_remove(world, entity, T)\
283
ecs_remove_id(world, entity, ecs_id(T))
284
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#define ecs_remove_pair(world, subject, first, second)\
286
ecs_remove_id(world, subject, ecs_pair(first, second))
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#define ecs_override(world, entity, T)\
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ecs_override_id(world, entity, ecs_id(T))
291
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#define ecs_override_pair(world, subject, first, second)\
293
ecs_override_id(world, subject, ecs_pair(first, second))
294
302
#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, ...)\
309
ecs_set_id(world, subject,\
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ecs_pair(ecs_id(First), second),\
311
sizeof(First), &(First)__VA_ARGS__)
312
313
#define ecs_set_pair_second(world, subject, first, Second, ...)\
314
ecs_set_id(world, subject,\
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ecs_pair(first, ecs_id(Second)),\
316
sizeof(Second), &(Second)__VA_ARGS__)
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#define ecs_set_pair_object ecs_set_pair_second
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#define ecs_set_override(world, entity, T, ...)\
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ecs_add_id(world, entity, ECS_OVERRIDE | ecs_id(T));\
322
ecs_set(world, entity, T, __VA_ARGS__)
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#define ecs_emplace(world, entity, T)\
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(ECS_CAST(T*, ecs_emplace_id(world, entity, ecs_id(T))))
326
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#define ecs_emplace_pair(world, entity, First, second)\
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(ECS_CAST(First*, ecs_emplace_id(world, entity, ecs_pair_t(First, second))))
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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)\
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(ECS_CAST(const First*, ecs_get_id(world, subject,\
335
ecs_pair(ecs_id(First), second))))
336
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#define ecs_get_pair_second(world, subject, first, Second)\
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(ECS_CAST(const Second*, ecs_get_id(world, subject,\
339
ecs_pair(first, ecs_id(Second)))))
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#define ecs_get_pair_object ecs_get_pair_second
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#define ecs_record_get(world, record, T)\
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(ECS_CAST(const T*, ecs_record_get_id(world, record, ecs_id(T))))
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#define ecs_record_has(world, record, T)\
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(ecs_record_has_id(world, record, ecs_id(T)))
348
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#define ecs_record_get_pair(world, record, First, second)\
350
(ECS_CAST(const First*, ecs_record_get_id(world, record, \
351
ecs_pair(ecs_id(First), second))))
352
353
#define ecs_record_get_pair_second(world, record, first, Second)\
354
(ECS_CAST(const Second*, ecs_record_get_id(world, record,\
355
ecs_pair(first, ecs_id(Second)))))
356
357
#define ecs_record_get_mut(world, record, T)\
358
(ECS_CAST(T*, ecs_record_get_mut_id(world, record, ecs_id(T))))
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#define ecs_record_get_mut_pair(world, record, First, second)\
361
(ECS_CAST(First*, ecs_record_get_mut_id(world, record, \
362
ecs_pair(ecs_id(First), second))))
363
364
#define ecs_record_get_mut_pair_second(world, record, first, Second)\
365
(ECS_CAST(Second*, ecs_record_get_mut_id(world, record,\
366
ecs_pair(first, ecs_id(Second)))))
367
368
#define ecs_record_get_mut_pair_object ecs_record_get_mut_pair_second
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370
#define ecs_ref_init(world, entity, T)\
371
ecs_ref_init_id(world, entity, ecs_id(T))
372
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#define ecs_ref_get(world, ref, T)\
374
(ECS_CAST(const T*, ecs_ref_get_id(world, ref, ecs_id(T))))
375
376
#define ecs_get_mut(world, entity, T)\
377
(ECS_CAST(T*, ecs_get_mut_id(world, entity, ecs_id(T))))
378
379
#define ecs_get_mut_pair(world, subject, First, second)\
380
(ECS_CAST(First*, ecs_get_mut_id(world, subject,\
381
ecs_pair(ecs_id(First), second))))
382
383
#define ecs_get_mut_pair_second(world, subject, first, Second)\
384
(ECS_CAST(Second*, ecs_get_mut_id(world, subject,\
385
ecs_pair(first, ecs_id(Second)))))
386
387
#define ecs_get_mut_pair_object ecs_get_mut_pair_second
388
389
#define ecs_modified(world, entity, component)\
390
ecs_modified_id(world, entity, ecs_id(component))
391
392
#define ecs_modified_pair(world, subject, first, second)\
393
ecs_modified_id(world, subject, ecs_pair(first, second))
394
402
#define ecs_singleton_add(world, comp)\
403
ecs_add(world, ecs_id(comp), comp)
404
405
#define ecs_singleton_remove(world, comp)\
406
ecs_remove(world, ecs_id(comp), comp)
407
408
#define ecs_singleton_get(world, comp)\
409
ecs_get(world, ecs_id(comp), comp)
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#define ecs_singleton_set(world, comp, ...)\
412
ecs_set(world, ecs_id(comp), comp, __VA_ARGS__)
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#define ecs_singleton_get_mut(world, comp)\
415
ecs_get_mut(world, ecs_id(comp), comp)
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417
#define ecs_singleton_modified(world, comp)\
418
ecs_modified(world, ecs_id(comp), comp)
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427
#define ecs_has(world, entity, T)\
428
ecs_has_id(world, entity, ecs_id(T))
429
430
#define ecs_has_pair(world, entity, first, second)\
431
ecs_has_id(world, entity, ecs_pair(first, second))
432
433
#define ecs_owns_pair(world, entity, first, second)\
434
ecs_owns_id(world, entity, ecs_pair(first, second))
435
436
#define ecs_owns(world, entity, T)\
437
ecs_owns_id(world, entity, ecs_id(T))
438
439
#define ecs_shares_id(world, entity, id)\
440
(ecs_search_relation(world, ecs_get_table(world, entity), 0, ecs_id(id), \
441
EcsIsA, 1, 0, 0, 0, 0) != -1)
442
443
#define ecs_shares_pair(world, entity, first, second)\
444
(ecs_shares_id(world, entity, ecs_pair(first, second)))
445
446
#define ecs_shares(world, entity, T)\
447
(ecs_shares_id(world, entity, ecs_id(T)))
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#define ecs_enable_component(world, entity, T, enable)\
457
ecs_enable_id(world, entity, ecs_id(T), enable)
458
459
#define ecs_is_enabled_component(world, entity, T)\
460
ecs_is_enabled_id(world, entity, ecs_id(T))
461
462
#define ecs_enable_pair(world, entity, First, second, enable)\
463
ecs_enable_id(world, entity, ecs_pair(ecs_id(First), second), enable)
464
465
#define ecs_is_enabled_pair(world, entity, First, second)\
466
ecs_is_enabled_id(world, entity, ecs_pair(ecs_id(First), second))
467
475
#define ecs_lookup_path(world, parent, path)\
476
ecs_lookup_path_w_sep(world, parent, path, "."
, NULL, true)
477
478
#define ecs_lookup_fullpath(world, path)\
479
ecs_lookup_path_w_sep(world, 0, path, "."
, NULL, true)
480
481
#define ecs_get_path(world, parent, child)\
482
ecs_get_path_w_sep(world, parent, child, "."
, NULL)
483
484
#define ecs_get_fullpath(world, child)\
485
ecs_get_path_w_sep(world, 0, child, "."
, NULL)
486
487
#define ecs_get_fullpath_buf(world, child, buf)\
488
ecs_get_path_w_sep_buf(world, 0, child, "."
, NULL, buf)
489
490
#define ecs_new_from_path(world, parent, path)\
491
ecs_new_from_path_w_sep(world, parent, path, "."
, NULL)
492
493
#define ecs_new_from_fullpath(world, path)\
494
ecs_new_from_path_w_sep(world, 0, path, "."
, NULL)
495
496
#define ecs_add_path(world, entity, parent, path)\
497
ecs_add_path_w_sep(world, entity, parent, path, "."
, NULL)
498
499
#define ecs_add_fullpath(world, entity, path)\
500
ecs_add_path_w_sep(world, entity, 0, path, "."
, NULL)
501
511
#define ecs_set_hooks(world, T, ...)\
512
ecs_set_hooks_id(world, ecs_id(T), &(ecs_type_hooks_t)__VA_ARGS__)
513
514
#define ecs_get_hooks(world, T)\
515
ecs_get_hooks_id(world, ecs_id(T));
516
521
#define ECS_CTOR(type, var, ...)\
522
ECS_XTOR_IMPL(type, ctor, var, __VA_ARGS__)
523
528
#define ECS_DTOR(type, var, ...)\
529
ECS_XTOR_IMPL(type, dtor, var, __VA_ARGS__)
530
535
#define ECS_COPY(type, dst_var, src_var, ...)\
536
ECS_COPY_IMPL(type, dst_var, src_var, __VA_ARGS__)
537
542
#define ECS_MOVE(type, dst_var, src_var, ...)\
543
ECS_MOVE_IMPL(type, dst_var, src_var, __VA_ARGS__)
544
549
#define ECS_ON_ADD(type, ptr, ...)\
550
ECS_HOOK_IMPL(type, ecs_on_add(type), ptr, __VA_ARGS__)
551
#define ECS_ON_REMOVE(type, ptr, ...)\
552
ECS_HOOK_IMPL(type, ecs_on_remove(type), ptr, __VA_ARGS__)
553
#define ECS_ON_SET(type, ptr, ...)\
554
ECS_HOOK_IMPL(type, ecs_on_set(type), ptr, __VA_ARGS__)
555
556
/* Map from typename to function name of component lifecycle action */
557
#define ecs_ctor(type) type##_ctor
558
#define ecs_dtor(type) type##_dtor
559
#define ecs_copy(type) type##_copy
560
#define ecs_move(type) type##_move
561
#define ecs_on_set(type) type##_on_set
562
#define ecs_on_add(type) type##_on_add
563
#define ecs_on_remove(type) type##_on_remove
564
572
#define ecs_count(world, type)\
573
ecs_count_id(world, ecs_id(type))
574
582
#define ecs_field(it, T, index)\
583
(ECS_CAST(T*, ecs_field_w_size(it, sizeof(T), index)))
584
592
#define ecs_table_get(world, table, T, offset)\
593
(ECS_CAST(T*, ecs_table_get_id(world, table, ecs_id(T), offset)))
594
595
#define ecs_table_get_pair(world, table, First, second, offset)\
596
(ECS_CAST(First*, ecs_table_get_id(world, table, ecs_pair(ecs_id(First), second), offset)))
597
598
#define ecs_table_get_pair_second(world, table, first, Second, offset)\
599
(ECS_CAST(Second*, ecs_table_get_id(world, table, ecs_pair(first, ecs_id(Second)), offset)))
600
608
#define ecs_value(T, ptr) ((ecs_value_t){ecs_id(T), ptr})
609
#define ecs_value_new_t(world, T) ecs_value_new(world, ecs_id(T))
610
621
#define ecs_sort_table(id) ecs_id(id##_sort_table)
622
623
#define ecs_compare(id) ecs_id(id##_compare_fn)
624
625
/* Declare efficient table sorting operation that uses provided compare function.
626
* For best results use LTO or make the function body visible in the same compilation unit.
627
* Variadic arguments are prepended before generated functions, use it to declare static
628
* or exported functions.
629
* Parameters of the comparison function:
630
* ecs_entity_t e1, const void* ptr1,
631
* ecs_entity_t e2, const void* ptr2
632
* Parameters of the sort functions:
633
* ecs_world_t *world
634
* ecs_table_t *table
635
* ecs_entity_t *entities
636
* void *ptr
637
* int32_t elem_size
638
* int32_t lo
639
* int32_t hi
640
* ecs_order_by_action_t order_by - Pointer to the original comparison function. You are not supposed to use it.
641
* Example:
642
* 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; }
643
* ECS_SORT_TABLE_WITH_COMPARE(MyType, MyCustomCompare, CompareMyType)
644
*/
645
#define ECS_SORT_TABLE_WITH_COMPARE(id, op_name, compare_fn, ...) \
646
static int32_t ECS_CONCAT(op_name, _partition)( \
647
ecs_world_t *world, \
648
ecs_table_t *table, \
649
ecs_entity_t *entities, \
650
void *ptr, \
651
int32_t elem_size, \
652
int32_t lo, \
653
int32_t hi, \
654
ecs_order_by_action_t order_by) \
655
{ \
656
(void)(order_by); \
657
int32_t p = (hi + lo) / 2; \
658
void *pivot = ECS_ELEM(ptr, elem_size, p); \
659
ecs_entity_t pivot_e = entities[p]; \
660
int32_t i = lo - 1, j = hi + 1; \
661
void *el; \
662
repeat: \
663
{ \
664
do { \
665
i ++; \
666
el = ECS_ELEM(ptr, elem_size, i); \
667
} while ( compare_fn(entities[i], el, pivot_e, pivot) < 0); \
668
do { \
669
j --; \
670
el = ECS_ELEM(ptr, elem_size, j); \
671
} while ( compare_fn(entities[j], el, pivot_e, pivot) > 0); \
672
if (i >= j) { \
673
return j; \
674
} \
675
ecs_table_swap_rows(world, table, i, j); \
676
if (p == i) { \
677
pivot = ECS_ELEM(ptr, elem_size, j); \
678
pivot_e = entities[j]; \
679
} else if (p == j) { \
680
pivot = ECS_ELEM(ptr, elem_size, i); \
681
pivot_e = entities[i]; \
682
} \
683
goto repeat; \
684
} \
685
} \
686
__VA_ARGS__ void op_name( \
687
ecs_world_t *world, \
688
ecs_table_t *table, \
689
ecs_entity_t *entities, \
690
void *ptr, \
691
int32_t size, \
692
int32_t lo, \
693
int32_t hi, \
694
ecs_order_by_action_t order_by) \
695
{ \
696
if ((hi - lo) < 1) { \
697
return; \
698
} \
699
int32_t p = ECS_CONCAT(op_name, _partition)(world, table, entities, ptr, size, lo, hi, order_by); \
700
op_name(world, table, entities, ptr, size, lo, p, order_by); \
701
op_name(world, table, entities, ptr, size, p + 1, hi, order_by); \
702
}
703
704
/* Declare efficient table sorting operation that uses default component comparison operator.
705
* For best results use LTO or make the comparison operator visible in the same compilation unit.
706
* Variadic arguments are prepended before generated functions, use it to declare static
707
* or exported functions.
708
* Example:
709
* ECS_COMPARE(MyType, { const MyType* p1 = ptr1; const MyType* p2 = ptr2; return p1->value - p2->value; });
710
* ECS_SORT_TABLE(MyType)
711
*/
712
#define ECS_SORT_TABLE(id, ...) \
713
ECS_SORT_TABLE_WITH_COMPARE(id, ecs_sort_table(id), ecs_compare(id), __VA_ARGS__)
714
715
/* Declare component comparison operations.
716
* Parameters:
717
* ecs_entity_t e1, const void* ptr1,
718
* ecs_entity_t e2, const void* ptr2
719
* Example:
720
* ECS_COMPARE(MyType, { const MyType* p1 = ptr1; const MyType* p2 = ptr2; return p1->value - p2->value; });
721
*/
722
#define ECS_COMPARE(id, ...) \
723
int ecs_compare(id)(ecs_entity_t e1, const void* ptr1, ecs_entity_t e2, const void* ptr2) { \
724
__VA_ARGS__ \
725
}
726
736
#define ecs_isa(e) ecs_pair(EcsIsA, e)
737
#define ecs_childof(e) ecs_pair(EcsChildOf, e)
738
#define ecs_dependson(e) ecs_pair(EcsDependsOn, e)
739
740
#define ecs_query_new(world, q_expr)\
741
ecs_query_init(world, &(ecs_query_desc_t){\
742
.filter.expr = q_expr\
743
})
744
745
#define ecs_rule_new(world, q_expr)\
746
ecs_rule_init(world, &(ecs_filter_desc_t){\
747
.expr = q_expr\
748
})
749
754
#endif
// FLECS_C_