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Propagate world position system

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This commit is contained in:
Derek Christ
2025-05-31 15:19:13 +02:00
parent dbddea69f5
commit a456a87728
1 changed files with 32 additions and 17 deletions
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49
src/physics.cpp
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@@ -14,23 +14,38 @@ PhysicsModule::PhysicsModule(flecs::world& world)
pos.y += vel.y;
});
// world.system<WorldPosition, Position const>("PropagatePosition")
// .kind(flecs::PostUpdate)
// .each(
// [](flecs::entity e, WorldPosition& world_pos, Position const& local_pos)
// {
// if (e.parent() == flecs::entity::null())
// {
// world_pos.x = local_pos.x;
// world_pos.y = local_pos.y;
// }
// else
// {
// auto parent_world_pos = e.parent().get<WorldPosition>();
// world_pos.x = parent_world_pos->x + local_pos.x;
// world_pos.y = parent_world_pos->y + local_pos.y;
// }
// });
// Introduce phase that runs after OnUpdate but before OnValidate
flecs::entity propagate_phase = world.entity().add(flecs::Phase).depends_on(flecs::OnUpdate);
world.system<WorldPosition, Position const>("PropagatePosition")
.kind(propagate_phase)
.each(
[](flecs::entity e, WorldPosition& world_pos, Position const& local_pos)
{
if (e.parent() != flecs::entity::null() && e.parent().has<WorldPosition>())
return;
world_pos.x = local_pos.x;
world_pos.y = local_pos.y;
std::function<void(flecs::entity, WorldPosition const&)> propagate_to_children;
propagate_to_children = [&](flecs::entity parent, WorldPosition const& parent_pos)
{
parent.children(
[=](flecs::entity child)
{
auto local_pos = child.get<Position>();
auto world_pos = child.get_mut<WorldPosition>();
world_pos->x = parent_pos.x + local_pos->x;
world_pos->y = parent_pos.y + local_pos->y;
propagate_to_children(child, *world_pos);
});
};
propagate_to_children(e, world_pos);
});
world.system<SdlHandles const, WorldPosition const, Size const, CollisionBox>("DrawBoxes")
.term_at(0)