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b230fe18ce
While this does require an extra call after registering components, it allows for multiple component sets (ie, sub-systems) to be registered before the component pools are created. The base id for the registered component set is returned so it can be passed to the subsystem as needed.
128 lines
3.2 KiB
C
128 lines
3.2 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_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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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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