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https://git.code.sf.net/p/quake/quakeforge
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6701f921a4
It returns null if the entity is invalid or doesn't have the component. Useful when the component is optional.
142 lines
3.7 KiB
C
142 lines
3.7 KiB
C
/*
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entity.h
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ECS entity management
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Copyright (C) 2022 Bill Currie <bill@taniwha.org>
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Author: Bill Currie <bill@taniwha.org>
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Date: 2022/10/07
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifndef __QF_ecs_entity_h
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#define __QF_ecs_entity_h
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/** \defgroup ecs_entity Entity Component System Entities
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\ingroup ecs
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*/
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///@{
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#define ENT_IDBITS 20
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#define nullent (~0u)
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#define ENTINLINE GNU89INLINE inline
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ENTINLINE int ECS_EntValid (uint32_t id, ecs_registry_t *reg);
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ENTINLINE uint32_t Ent_Index (uint32_t id);
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ENTINLINE uint32_t Ent_Generation (uint32_t id);
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ENTINLINE uint32_t Ent_NextGen (uint32_t id);
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ENTINLINE int Ent_HasComponent (uint32_t ent, uint32_t comp,
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ecs_registry_t *reg);
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ENTINLINE void *Ent_GetComponent (uint32_t ent, uint32_t comp,
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ecs_registry_t *reg);
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ENTINLINE void *Ent_SafeGetComponent (uint32_t ent, uint32_t comp,
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ecs_registry_t *reg);
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ENTINLINE void *Ent_SetComponent (uint32_t ent, uint32_t comp,
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ecs_registry_t *registry, const void *data);
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#undef ENTINLINE
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#ifndef IMPLEMENT_ECS_ENTITY_Funcs
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#define ENTINLINE GNU89INLINE inline
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#else
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#define ENTINLINE VISIBLE
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#endif
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ENTINLINE uint32_t
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Ent_Index (uint32_t id)
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{
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return id & ((1 << ENT_IDBITS) - 1);
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}
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ENTINLINE uint32_t
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Ent_Generation (uint32_t id)
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{
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return id & ~((1 << ENT_IDBITS) - 1);
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}
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ENTINLINE uint32_t
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Ent_NextGen(uint32_t id)
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{
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return id + (1 << ENT_IDBITS);
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}
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ENTINLINE int
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ECS_EntValid (uint32_t id, ecs_registry_t *reg)
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{
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uint32_t ind = Ent_Index (id);
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return ind < reg->num_entities && reg->entities[ind] == id;
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}
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ENTINLINE int
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Ent_HasComponent (uint32_t ent, uint32_t comp, ecs_registry_t *reg)
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{
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ecs_pool_t *pool = ®->comp_pools[comp];
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uint32_t ind = pool->sparse[Ent_Index (ent)];
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return ind < pool->count && pool->dense[ind] == ent;
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}
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ENTINLINE void *
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Ent_GetComponent (uint32_t ent, uint32_t comp, ecs_registry_t *reg)
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{
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const component_t *component = ®->components.a[comp];
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uint32_t ind = reg->comp_pools[comp].sparse[Ent_Index (ent)];
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byte *data = reg->comp_pools[comp].data;
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return data + ind * component->size;
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}
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ENTINLINE void *
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Ent_SafeGetComponent (uint32_t ent, uint32_t comp, ecs_registry_t *reg)
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{
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if (!ECS_EntValid (ent, reg) || !Ent_HasComponent (ent, comp, reg)) {
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return 0;
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}
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const component_t *component = ®->components.a[comp];
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uint32_t ind = reg->comp_pools[comp].sparse[Ent_Index (ent)];
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byte *data = reg->comp_pools[comp].data;
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return data + ind * component->size;
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}
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void *Ent_AddComponent (uint32_t ent, uint32_t comp, ecs_registry_t *registry);
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void Ent_RemoveComponent (uint32_t ent, uint32_t comp,
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ecs_registry_t *registry);
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ENTINLINE void *
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Ent_SetComponent (uint32_t ent, uint32_t comp, ecs_registry_t *registry,
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const void *data)
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{
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void *dst = Ent_AddComponent (ent, comp, registry);
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if (data) {
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return Component_CopyElements (®istry->components.a[comp],
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dst, 0, data, 0, 1);
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} else {
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return Component_CreateElements (®istry->components.a[comp],
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dst, 0, 1);
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}
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}
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#undef ENTINLINE
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///@}
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#endif//__QF_ecs_entity_h
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