1 files changed, 214 insertions, 0 deletions
diff --git a/game/server/universe.cc b/game/server/universe.cc
new file mode 100644
index 0000000..22abaff
--- /dev/null
+++ b/game/server/universe.cc
@@ -0,0 +1,214 @@
+#include "server/pch.hh"
+#include "server/universe.hh"
+
+#include "core/config.hh"
+#include "core/epoch.hh"
+#include "core/buffer.hh"
+
+#include "shared/chunk.hh"
+#include "shared/dimension.hh"
+
+#include "server/globals.hh"
+#include "server/inhabited.hh"
+#include "server/overworld.hh"
+
+struct DimensionMetadata final {
+    std::string config_path;
+    std::string zvox_dir;
+    Config config;
+};
+
+static ConfigString universe_name("save");
+
+static Config universe_config;
+static ConfigUnsigned64 universe_config_seed;
+static ConfigString universe_spawn_dimension("world");
+
+static std::string universe_config_path;
+static std::unordered_map<Dimension *, DimensionMetadata *> metadata_map;
+
+static std::string make_chunk_filename(const DimensionMetadata *metadata, const chunk_pos &cpos)
+{
+    const auto unsigned_x = static_cast<std::uint32_t>(cpos.x);
+    const auto unsigned_y = static_cast<std::uint32_t>(cpos.y);
+    const auto unsigned_z = static_cast<std::uint32_t>(cpos.z);
+    return fmt::format("{}/{:08X}-{:08X}-{:08X}.zvox", metadata->zvox_dir, unsigned_x, unsigned_y, unsigned_z);
+}
+
+static void add_new_dimension(Dimension *dimension)
+{
+    if(globals::dimensions.count(dimension->get_name())) {
+        spdlog::critical("universe: dimension named {} already exists", dimension->get_name());
+        std::terminate();
+    }
+
+    auto dimension_dir = fmt::format("{}/{}", universe_name.get(), dimension->get_name());
+
+    if(!PHYSFS_mkdir(dimension_dir.c_str())) {
+        spdlog::critical("universe: {}: {}", dimension_dir, PHYSFS_getErrorByCode(PHYSFS_getLastErrorCode()));
+        std::terminate();
+    }
+
+    auto metadata = new DimensionMetadata;
+    metadata->config_path = fmt::format("{}/dimension.conf", dimension_dir);
+    metadata->zvox_dir = fmt::format("{}/chunk", dimension_dir);
+
+    if(!PHYSFS_mkdir(metadata->zvox_dir.c_str())) {
+        spdlog::critical("universe: {}: {}", metadata->zvox_dir, PHYSFS_getErrorByCode(PHYSFS_getLastErrorCode()));
+        std::terminate();
+    }
+    
+    globals::dimensions.insert_or_assign(dimension->get_name(), dimension);
+    
+    auto &mapped_metadata = metadata_map.insert_or_assign(dimension, metadata).first->second;
+
+    dimension->init(mapped_metadata->config);
+
+    mapped_metadata->config.load_file(mapped_metadata->config_path.c_str());
+
+    dimension->init_late(universe_config_seed.get_value());
+}
+
+static void internal_save_chunk(const DimensionMetadata *metadata, const Dimension *dimension, const chunk_pos &cpos, const Chunk *chunk)
+{
+    auto path = make_chunk_filename(metadata, cpos);
+
+    WriteBuffer buffer;
+    chunk->get_voxels().serialize(buffer);
+
+    if(auto file = buffer.to_file(path.c_str())) {
+        PHYSFS_close(file);
+        return;
+    }
+}
+
+void universe::init(void)
+{
+    // If the world is newly created, the seed will
+    // be chosed based on the current system's view on UNIX time
+    universe_config_seed.set_value(epoch::microseconds());
+
+    // We're going to read files from directory named with
+    // the value of this config value. Since config is also
+    // read from command line, the [--universe <name>] parameter still works
+    globals::server_config.add_value("universe", universe_name);
+
+    universe_config.add_value("global_seed", universe_config_seed);
+    universe_config.add_value("spawn_dimension", universe_spawn_dimension);
+}
+
+void universe::init_late(void)
+{
+    const auto universe_dir = std::string(universe_name.get());
+
+    if(!PHYSFS_mkdir(universe_dir.c_str())) {
+        spdlog::critical("universe: {}: {}", universe_dir, PHYSFS_getErrorByCode(PHYSFS_getLastErrorCode()));
+        std::terminate();
+    }
+
+    universe_config_path = fmt::format("{}/universe.conf", universe_dir);
+    universe_config.load_file(universe_config_path.c_str());
+
+    add_new_dimension(new Overworld("world"));
+
+    // UNDONE: lua scripts to setup dimensions
+    if(globals::dimensions.empty()) {
+        spdlog::critical("universe: no dimensions");
+        std::terminate();
+    }
+
+    auto spawn_dimension = globals::dimensions.find(universe_spawn_dimension.get());
+
+    if(spawn_dimension == globals::dimensions.cend()) {
+        spdlog::critical("universe: {} is not a valid dimension name", universe_spawn_dimension.get());
+        std::terminate();
+    }
+
+    globals::spawn_dimension = spawn_dimension->second;
+}
+
+void universe::deinit(void)
+{
+    for(const auto metadata : metadata_map) {
+        metadata.second->config.save_file(metadata.second->config_path.c_str());
+        delete metadata.second;
+    }
+
+    metadata_map.clear();
+
+    for(const auto dimension : globals::dimensions) {
+        universe::save_all_chunks(dimension.second);
+        delete dimension.second;
+    }
+ 
+    globals::dimensions.clear();
+    globals::spawn_dimension = nullptr;
+
+    universe_config.save_file(universe_config_path.c_str());
+}
+
+Chunk *universe::load_chunk(Dimension *dimension, const chunk_pos &cpos)
+{
+    if(auto chunk = dimension->find_chunk(cpos)) {
+        // Just return the existing chunk which is
+        // most probable to be up to date compared to
+        // whatever the hell is currently stored on disk
+        return chunk;
+    }
+
+    auto metadata = metadata_map.find(dimension);
+
+    if(metadata == metadata_map.cend()) {
+        // The dimension is for sure a weird one
+        return nullptr;
+    }
+
+    if(auto file = PHYSFS_openRead(make_chunk_filename(metadata->second, cpos).c_str())) {
+        VoxelStorage voxels;
+        ReadBuffer buffer(file);
+        voxels.deserialize(buffer);
+
+        PHYSFS_close(file);
+
+        auto chunk = dimension->create_chunk(cpos);
+        chunk->set_voxels(voxels);
+
+        // Make sure we're going to save it later
+        dimension->chunks.emplace_or_replace<InhabitedComponent>(chunk->get_entity());
+
+        return chunk;
+    }
+
+    return nullptr;
+}
+
+void universe::save_chunk(Dimension *dimension, const chunk_pos &cpos)
+{
+    auto metadata = metadata_map.find(dimension);
+
+    if(metadata == metadata_map.cend()) {
+        // Cannot save a chunk in a dimension
+        // that doesn't have a metadata struct
+        return;
+    }
+
+    if(auto chunk = dimension->find_chunk(cpos)) {
+        internal_save_chunk(metadata->second, dimension, cpos, chunk);
+    }
+}
+
+void universe::save_all_chunks(Dimension *dimension)
+{
+    auto group = dimension->chunks.group(entt::get<ChunkComponent, InhabitedComponent>);
+    auto metadata = metadata_map.find(dimension);
+
+    if(metadata == metadata_map.cend()) {
+        // Cannot save a chunk in a dimension
+        // that doesn't have a metadata struct
+        return;
+    }
+
+    for(auto [entity, chunk] : group.each()) {
+        internal_save_chunk(metadata->second, dimension, chunk.cpos, chunk.chunk);
+    }
+}