🛠️🐜 Antkeeper superbuild with dependencies included
https://antkeeper.com
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
56 lines
1.1 KiB
56 lines
1.1 KiB
#include <entt/entt.hpp>
|
|
#include <cstdint>
|
|
|
|
struct position {
|
|
float x;
|
|
float y;
|
|
};
|
|
|
|
struct velocity {
|
|
float dx;
|
|
float dy;
|
|
};
|
|
|
|
void update(entt::registry ®istry) {
|
|
auto view = registry.view<position, velocity>();
|
|
|
|
for(auto entity: view) {
|
|
// gets only the components that are going to be used ...
|
|
|
|
auto &vel = view.get<velocity>(entity);
|
|
|
|
vel.dx = 0.;
|
|
vel.dy = 0.;
|
|
|
|
// ...
|
|
}
|
|
}
|
|
|
|
void update(std::uint64_t dt, entt::registry ®istry) {
|
|
registry.view<position, velocity>().each([dt](auto &pos, auto &vel) {
|
|
// gets all the components of the view at once ...
|
|
|
|
pos.x += vel.dx * dt;
|
|
pos.y += vel.dy * dt;
|
|
|
|
// ...
|
|
});
|
|
}
|
|
|
|
int main() {
|
|
entt::registry registry;
|
|
std::uint64_t dt = 16;
|
|
|
|
for(auto i = 0; i < 10; ++i) {
|
|
auto entity = registry.create();
|
|
registry.emplace<position>(entity, i * 1.f, i * 1.f);
|
|
if(i % 2 == 0) { registry.emplace<velocity>(entity, i * .1f, i * .1f); }
|
|
}
|
|
|
|
update(dt, registry);
|
|
update(registry);
|
|
|
|
// ...
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|