1 files changed, 78 insertions, 0 deletions
diff --git a/src/game/server/world/unloader.cc b/src/game/server/world/unloader.cc
new file mode 100644
index 0000000..4a3f4e1
--- /dev/null
+++ b/src/game/server/world/unloader.cc
@@ -0,0 +1,78 @@
+#include "server/pch.hh"
+
+#include "server/world/unloader.hh"
+
+#include "core/config/number.hh"
+
+#include "shared/entity/player.hh"
+#include "shared/entity/transform.hh"
+
+#include "shared/world/chunk.hh"
+#include "shared/world/chunk_aabb.hh"
+#include "shared/world/dimension.hh"
+
+#include "server/world/inhabited.hh"
+#include "server/world/universe.hh"
+
+#include "server/game.hh"
+#include "server/globals.hh"
+
+static void on_chunk_update(const world::ChunkUpdateEvent& event)
+{
+    event.dimension->chunks.emplace_or_replace<world::Inhabited>(event.chunk->get_entity());
+}
+
+static void on_voxel_set(const world::VoxelSetEvent& event)
+{
+    event.dimension->chunks.emplace_or_replace<world::Inhabited>(event.chunk->get_entity());
+}
+
+void world::unloader::init(void)
+{
+    globals::dispatcher.sink<world::ChunkUpdateEvent>().connect<&on_chunk_update>();
+    globals::dispatcher.sink<world::VoxelSetEvent>().connect<&on_voxel_set>();
+}
+
+void world::unloader::init_late(void)
+{
+}
+
+void world::unloader::fixed_update_late(Dimension* dimension)
+{
+    auto group = dimension->entities.group(entt::get<entity::Player, entity::Transform>);
+    auto boxes = std::vector<ChunkAABB>();
+
+    for(const auto [entity, transform] : group.each()) {
+        ChunkAABB aabb;
+        aabb.min = transform.chunk - static_cast<chunk_pos::value_type>(server_game::view_distance.get_value());
+        aabb.max = transform.chunk + static_cast<chunk_pos::value_type>(server_game::view_distance.get_value());
+        boxes.push_back(aabb);
+    }
+
+    auto view = dimension->chunks.view<ChunkComponent>();
+    auto chunk_in_view = false;
+
+    for(const auto [entity, chunk] : view.each()) {
+        chunk_in_view = false;
+
+        for(const auto& aabb : boxes) {
+            if(aabb.contains(chunk.cpos)) {
+                chunk_in_view = true;
+                break;
+            }
+        }
+
+        if(chunk_in_view) {
+            // The chunk is within view box of at least
+            // a single player; we shouldn't unload it now
+            continue;
+        }
+
+        if(dimension->chunks.any_of<Inhabited>(entity)) {
+            // Only store inhabited chunks on disk
+            world::universe::save_chunk(dimension, chunk.cpos);
+        }
+
+        dimension->remove_chunk(entity);
+    }
+}