139 lines
3.9 KiB
C
139 lines
3.9 KiB
C
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//
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// ecs.h
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// gl_project
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//
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// Created by Scott on 08/09/2022.
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//
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#ifndef ecs_h
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#define ecs_h
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#include <stddef.h>
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#include <memory.h>
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#include <stdlib.h>
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#if __cplusplus
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extern "C" {
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#endif
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typedef unsigned long long ecsEntityId;
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typedef unsigned long long ecsComponentMask;
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typedef void (*ecsSystemFn)(ecsEntityId*, ecsComponentMask*, size_t, float);
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#define noentity ((ecsEntityId)0x0)
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#define nocomponent ((ecsComponentMask)0x0)
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#define anycomponent ((ecsComponentMask)~0x0)
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typedef enum ECSqueryComparison {
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ECS_NOQUERY = 0x0,
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ECS_QUERY_ANY,
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ECS_QUERY_ALL,
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} ecsQueryComparison;
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typedef struct ecsComponentQuery {
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ecsQueryComparison comparison;
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ecsComponentMask mask;
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} ecsComponentQuery;
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void ecsInit(void);
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/**
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* \brief Allocates a component list for a component type of stride bytes.
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* \param stride The number of bytes to allocate for each component.
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*/
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ecsComponentMask ecsMakeComponentType(size_t stride);
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#define ecsRegisterComponent(__type) ecsMakeComponentType(sizeof(__type))
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/**
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* \brief Get a pointer to a component attached to entity.
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* \param entity The entity to find a component of.
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* \param component The component type to find.
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* \returns A pointer to a component if found.
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* \returns NULL if entity does not contain the given component.
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*/
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void* ecsGetComponentPtr(ecsEntityId entity, ecsComponentMask component);
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/**
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* \brief Assigns a new entity id.
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* \param components A component query referencing the components to add to the new object.
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* \returns The id used to reference the newly created entity.
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* \returns NULL if allocation failed
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*/
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ecsEntityId ecsCreateEntity(ecsComponentMask components);
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/**
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* \brief Gets the component mask for an entity.
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* \param entity the entity to get the mask for.
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* \returns the ecsComponentMask for entity.
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*/
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ecsEntityId ecsGetComponentMask(ecsEntityId entity);
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/**
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* \brief Checks if the argument is a valid entity id of a currently existing entity.
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* \param entity The entity to check the validity of.
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* \returns 1 if the entity exists, 0 otherwise.
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*/
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int ecsValidEntity(ecsEntityId entity);
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/**
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* \brief Destroys an entity and all associated components
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* \param entity The id of the entity to destroy.
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*/
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void ecsDestroyEntity(ecsEntityId entity);
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/**
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* \brief Attaches one or more components.
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* \param entity The entity to attach the new components to.
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* \param components Bitmask of the componentId's to attach.
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*/
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void ecsAttachComponents(ecsEntityId entity, ecsComponentMask components);
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/**
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* \brief Detaches one or more components.
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* \param entity The entity to detach components from.
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* \param components Bitmask of the components to detach.
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*/
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void ecsDetachComponents(ecsEntityId entity, ecsComponentMask components);
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/**
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* \brief Enables a function to act as a system for entities matching the given query.
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* \param func The function to call when query is met.
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* \param components The required components to run this system.
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* \param comparison The type of requirement components represent. one of { ECS_QUERY_ANY ; ECS_QUERY_ALL }.
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* \note
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* When comparison=ECS_QUERY_ALL the system will run only when all of the masked components are present on an entity.
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* \note
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* When comparison=ECS_QUERY_ANY the system will run for all entities where any of the masked components are present.
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*/
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void ecsEnableSystem(ecsSystemFn func, ecsComponentMask components, ecsQueryComparison comparison, int maxThreads, int executionOrder);
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/**
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* \brief Disables a function acting as a system.
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* \param func Pointer to the function to disable.
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*/
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void ecsDisableSystem(ecsSystemFn func);
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/**
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* \brief Run currently enabled systems.
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* \note Implicitly calls ecsRunTasks after completion.
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*/
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void ecsRunSystems(float deltaTime);
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/**
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* \brief Run queued tasks.
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*/
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void ecsRunTasks(void);
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/**
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* \brief Terminate the ECS and clean up allocated resources.
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*/
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void ecsTerminate(void);
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#if __cplusplus
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}
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#endif
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#endif /* ecs_h */
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