78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
#include "comp/entity.h"
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#include "comp/physical.h"
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#include "comp/visible.h"
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#include "comp/mechanical.h"
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#include "comp/fighter.h"
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#include "comp/particle.h"
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#include "aoe.h"
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/* Align up to native pointer size */
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#define ALIGN(expr) ((((expr) - 1) | (sizeof(void *) - 1)) + 1)
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entity_t *(entity_make)(uint32_t comps)
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{
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/* Determine full size of entity; also store offsets of components (we
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explicitly 4-align them so we don't want to compute it several times) */
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int offsets[ENTITY_COMP_CAPACITY] = { 0 };
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size_t size = 0;
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int n = 0;
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if(comps & ENTITY_COMP_physical) {
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offsets[n++] = size;
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size = ALIGN(size + sizeof(physical_t));
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}
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if(comps & ENTITY_COMP_visible) {
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offsets[n++] = size;
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size = ALIGN(size + sizeof(visible_t));
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}
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if(comps & ENTITY_COMP_mechanical) {
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offsets[n++] = size;
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size = ALIGN(size + sizeof(mechanical_t));
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}
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if(comps & ENTITY_COMP_fighter) {
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offsets[n++] = size;
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size = ALIGN(size + sizeof(fighter_t));
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}
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if(comps & ENTITY_COMP_aoe) {
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offsets[n++] = size;
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size = ALIGN(size + sizeof(aoe_t));
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}
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if(comps & ENTITY_COMP_particle) {
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offsets[n++] = size;
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size = ALIGN(size + sizeof(particle_t));
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}
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/* Allocate all components together */
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entity_t *e;
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size_t base_size = sizeof(*e) + n * sizeof(e->data[0]);
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e = calloc(1, base_size + size);
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if(e == NULL)
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return NULL;
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/* Initialize component addresses */
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e->comps = comps;
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for(int i = 0; i < n; i++)
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e->data[i] = (void *)e + base_size + offsets[i];
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return e;
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}
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void entity_mark_to_delete(entity_t *e)
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{
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e->deleted = 1;
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}
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void entity_destroy(entity_t *e)
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{
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if(e->comps & ENTITY_COMP_aoe) {
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aoe_destroy(e);
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}
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if(e->comps & ENTITY_COMP_fighter) {
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fighter_destroy(e);
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}
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/* Since there's only one allocation for all components, this is easy */
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free(e);
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}
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