65 lines
2 KiB
Odin
65 lines
2 KiB
Odin
package ecs
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import "base:intrinsics"
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import "core:log"
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SystemBase :: struct {
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entities: map[EntityID]struct{}, // Treat as set
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}
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SystemManager :: struct {
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signatures: map[typeid]Signature,
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systems: map[typeid]^SystemBase
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}
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system_manager_create :: proc() -> SystemManager {
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system_manager := SystemManager{
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signatures = make(map[typeid]Signature, context.allocator),
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systems = make(map[typeid]^SystemBase, context.allocator),
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}
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return system_manager
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}
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system_manager_register_system :: proc($T: typeid, system_manager: ^SystemManager) -> ^T {
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log.assertf(T not_in system_manager.systems, "Registering system more than once")
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log.assertf(intrinsics.type_has_field(T, "entities"), "Registering non system type")
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system := new(T, context.allocator)
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system.entities = make(map[EntityID]struct{})
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system_manager.systems[T] = system
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return system
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}
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system_manager_set_signature :: proc($T: typeid, system_manager: ^SystemManager, signature: Signature) {
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log.assertf(T in system_manager.systems, "System used before registered")
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system_manager.signatures[T] = signature
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}
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system_manager_destroy_entity :: proc(system_manager: ^SystemManager, entity_id: EntityID) {
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for _, system in system_manager.systems {
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delete_key(&system.entities, entity_id)
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}
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}
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system_manager_change_entity_signature :: proc(system_manager: ^SystemManager, entity_id: EntityID, entity_signature: Signature) {
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for type, system in system_manager.systems {
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system_signature := system_manager.signatures[type]
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if (entity_signature & system_signature) == system_signature {
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system.entities[entity_id] = {}
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} else {
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delete_key(&system.entities, entity_id)
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}
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}
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}
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system_manager_destroy :: proc(system_manager: ^SystemManager) {
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for _, system in system_manager.systems {
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delete(system.entities)
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free(system)
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}
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delete(system_manager.systems)
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delete(system_manager.signatures)
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}
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