world.c


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#include "world.h"
#include "platform.h"
#include "error.h"

void init_world(World* world) {
	world->entity_count = 0;
}

Entity new_entity(World* world) {
	Entity e;

#if DEBUG
	if (
		world->entity_count >= max_entities
		&& world->recycle_bin_count == 0
	) {
		platform_err("Too many entities.\n");
		platform_abort(error_out_of_memory);
	}
#endif

	e = 
		world->recycle_bin_count > 0 ?
		world->recycle_bin[--world->recycle_bin_count] :
		world->entity_count++;

	world->bitmask[e] = 0;

	return e;
}

void destroy_entity(World* world, Entity e) {
	world->recycle_bin[world->recycle_bin_count++] = e;
	world->bitmask[e] = 0;
}

void add_components(World* world, Entity e, CType bits) {
	world->bitmask[e] |= bits;
}

void remove_components(World* world, Entity e, CType bits) {
	world->bitmask[e] &= ~bits;
}