basics of ecs written, working on query, needs testing
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herbglitch
parent
ba09aff914
commit
c078ce907f
2 changed files with 205 additions and 16 deletions
167
src/std/entity.c
167
src/std/entity.c
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@ -1,31 +1,174 @@
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#include "arc/std/entity.h"
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#include "arc/std/array.h"
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#include "arc/std/errno.h"
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#include "arc/std/bool.h"
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#include "arc/std/vector.h"
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#include "arc/std/vector/inline.h"
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#include <stdlib.h>
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#include <string.h>
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//TODO: might want to change how vector holds data for speed
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struct ARC_EntitySystem {
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ARC_Vector *flagVector;
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ARC_Vector *maskVector;
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//entity data
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ARC_VectorInline *flagVector;
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ARC_VectorInline *maskVector;
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void *data;
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//component data
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ARC_VectorInline *offsetVector;
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ARC_VectorInline *sizeVector;
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//stored component data
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ARC_VectorInline *data;
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//TODO: this would probs be better to use a queue
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ARC_VectorInline *freeEntities;
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};
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ARC_Bool ARC_EntitySystem_VectorCompareDataFn(void *dataA, void *dataB){
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return (ARC_Bool)(*(uint32_t *)dataA == *(uint32_t *)dataB);
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}
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void ARC_EntitySystem_VectorDestroyDataFn(void *data){
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free((uint32_t *)data);
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}
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void ARC_EntitySystem_Create(ARC_EntitySystem **entitySystem){
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*entitySystem = (ARC_EntitySystem *)malloc(sizeof(ARC_EntitySystem));
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ARC_Vector_CompareDataFn compareDataFn = ARC_EntitySystem_VectorCompareDataFn;
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ARC_Vector_DestroyDataFn destroyDataFn = ARC_EntitySystem_VectorDestroyDataFn;
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//ARC_Vector_CompareDataFn compareDataFn = ARC_EntitySystem_VectorCompareDataFn;
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//ARC_Vector_DestroyDataFn destroyDataFn = ARC_EntitySystem_VectorDestroyDataFn;
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ARC_Vector_Create(&((*entitySystem)->flagVector), &compareDataFn, &destroyDataFn);
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ARC_Vector_Create(&((*entitySystem)->maskVector), &compareDataFn, &destroyDataFn);
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ARC_VectorInline_Create(&((*entitySystem)->flagVector) , sizeof(uint8_t) , NULL, NULL);
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ARC_VectorInline_Create(&((*entitySystem)->maskVector) , sizeof(uint32_t), NULL, NULL);
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ARC_VectorInline_Create(&((*entitySystem)->offsetVector), sizeof(uint32_t), NULL, NULL);
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ARC_VectorInline_Create(&((*entitySystem)->sizeVector) , sizeof(uint32_t), NULL, NULL);
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//can't create the data vector because no components have been registered
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(*entitySystem)->data = NULL;
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//TODO: this would probs be better to use a queue
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ARC_VectorInline_Create(&((*entitySystem)->freeEntities), sizeof(ARC_Entity), NULL, NULL);
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}
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void ARC_EntitySystem_Destroy(ARC_EntitySystem *entitySystem){
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if(entitySystem->data != NULL){
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ARC_VectorInline_Destroy(entitySystem->data);
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}
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ARC_VectorInline_Destroy(entitySystem->sizeVector);
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ARC_VectorInline_Destroy(entitySystem->offsetVector);
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ARC_VectorInline_Destroy(entitySystem->maskVector);
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ARC_VectorInline_Destroy(entitySystem->flagVector);
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free(entitySystem);
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}
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uint32_t ARC_EntitySystem_RegisterComponent(ARC_EntitySystem *entitySystem, uint32_t componentSize){
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//error if componentSize is zero, it must have been an error because a component is a type, and types have size
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if(componentSize == 0){
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arc_errno = ARC_ERRNO_NULL;
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ARC_DEBUG_LOG_ERROR("ARC_EntitySystem_RegisterComponent(entitySystem, componentSize), cannot add a component that does not have a size");
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return ~(uint32_t)0;
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}
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//if data exists, free it to recreate it with the new size
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if(entitySystem->data != NULL){
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ARC_VectorInline_Destroy(entitySystem->data);
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}
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//get the total component size
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uint32_t offsetEndIndex = ARC_VectorInline_GetSize(entitySystem->offsetVector);
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uint32_t totalSize = *(uint32_t *)ARC_VectorInline_Get(entitySystem->offsetVector, offsetEndIndex);
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//if the new component size would overflow, throw an error
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if(totalSize > (~(uint32_t)0) - componentSize){
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arc_errno = ARC_ERRNO_NULL;
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ARC_DEBUG_LOG_ERROR("ARC_EntitySystem_RegisterComponent(entitySystem, componentSize), cannot add a component because combined size with all the other components is bigger than a uint32_t max val");
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return ~(uint32_t)0;
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}
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//add the component size to the total size and the offset vector array
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ARC_VectorInline_Add(entitySystem->offsetVector, &totalSize);
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ARC_VectorInline_Add(entitySystem->sizeVector , &componentSize);
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totalSize += componentSize;
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//create the resized data vector that can now house the registered component
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ARC_VectorInline_Create(&(entitySystem->data), totalSize, NULL, NULL);
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//get the id (last index) in the offset vector
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return ARC_VectorInline_GetSize(entitySystem->offsetVector) - 1;
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}
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ARC_Entity ARC_EntitySystem_InitEntity(ARC_EntitySystem *entitySystem){
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//check if there is a free id to use
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if(ARC_VectorInline_GetSize(entitySystem->freeEntities) != 0){
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//get the next free entity and remove the used id from the free entities
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ARC_Entity entity = *(ARC_Entity *)ARC_VectorInline_Get(entitySystem->freeEntities, 0);
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ARC_VectorInline_RemoveIndex(entitySystem->freeEntities, 0);
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//set the flag to make the current entity alive
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uint8_t *flagData = (uint8_t *)ARC_VectorInline_Get(entitySystem->flagVector, (uint32_t)entity);
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*flagData = (uint8_t)ARC_ENTITY_ALIVE;
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//reset the mask data to clear all the components
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uint8_t *maskData = (uint8_t *)ARC_VectorInline_Get(entitySystem->maskVector, (uint32_t)entity);
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*maskData = 0;
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//return the entity
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return entity;
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}
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//get the next free entity
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ARC_Entity entity = (ARC_Entity)ARC_VectorInline_GetSize(entitySystem->data);
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//TODO: check if this works
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ARC_VectorInline_Add(entitySystem->data, NULL);
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//set the flag to make the current entity alive
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uint8_t *flagData = (uint8_t *)ARC_VectorInline_Get(entitySystem->flagVector, (uint32_t)entity);
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*flagData = (uint8_t)ARC_ENTITY_ALIVE;
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//reset the mask data to clear all the components
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uint8_t *maskData = (uint8_t *)ARC_VectorInline_Get(entitySystem->maskVector, (uint32_t)entity);
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*maskData = 0;
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//return the entity
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return entity;
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}
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void ARC_EntitySystem_ReleaseEntity(ARC_EntitySystem *entitySystem, ARC_Entity entity){
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//set the flag to make the current entity dead
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uint8_t *flagData = (uint8_t *)ARC_VectorInline_Get(entitySystem->flagVector, (uint32_t)entity);
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*flagData = (uint8_t)ARC_ENTITY_DEAD;
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//add the entity to the free entities vector
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ARC_VectorInline_Add(entitySystem->freeEntities, &entity);
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}
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void ARC_EntitySystem_AddComponent(ARC_EntitySystem *entitySystem, ARC_Entity entity, ARC_EntityComponent component, void *data){
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//get the component data to set
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uint32_t componentSize = *(uint32_t *)ARC_VectorInline_Get(entitySystem->sizeVector, (uint32_t)component);
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void *componentData = ARC_EntitySystem_GetComponentData(entitySystem, entity, component);
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//set the component in the entity mask
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uint32_t *maskData = (uint32_t *)ARC_VectorInline_Get(entitySystem->maskVector, (uint32_t)entity);
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*maskData |= 1 << (uint32_t)component;
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//copy the data into the component
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memcpy(componentData, data, componentSize);
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}
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ARC_Bool ARC_EntitySystem_HasComponent(ARC_EntitySystem *entitySystem, ARC_Entity entity, ARC_EntityComponent component){
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//get the mask, then check if it holds a component
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uint32_t *maskData = (uint32_t *)ARC_VectorInline_Get(entitySystem->maskVector, (uint32_t)entity);
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return (ARC_Bool)((*maskData & (1 << (uint32_t)component)) != 0);
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}
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void *ARC_EntitySystem_GetComponentData(ARC_EntitySystem *entitySystem, ARC_Entity entity, ARC_EntityComponent component){
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//get the entity row, then offset that for the component to get the component data
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void *data = ARC_VectorInline_Get(entitySystem->data, (uint32_t)entity);
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return data + *(int32_t *)ARC_VectorInline_Get(entitySystem->offsetVector, (uint32_t)component);
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}
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ARC_Array ARC_EntitySystem_QueryComponentsData(ARC_EntitySystem *entitySystem, uint32_t components){
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ARC_Array componentsData = { 0, NULL };
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componentsData.size = ARC_VectorInline_GetSize(entitySystem->data) - ARC_VectorInline_GetSize(entitySystem->freeEntities);
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return componentsData;
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}
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