async mesh loading

scene/eu7/eu7_pack_mesh_loader.h

@@ -0,0 +1,75 @@
+/*
+This Source Code Form is subject to the
+terms of the Mozilla Public License, v.
+2.0. If a copy of the MPL was not
+distributed with this file, You can
+obtain one at
+http://mozilla.org/MPL/2.0/.
+*/
+
+#pragma once
+
+#include <cstddef>
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+class TModel3d;
+
+namespace scene::eu7 {
+
+enum class PackMeshLoadWait {
+    NonBlocking,
+    BlockUntilReady,
+};
+
+void
+start_pack_mesh_loader();
+
+void
+stop_pack_mesh_loader();
+
+void
+reset_pack_mesh_loader();
+
+void
+request_pack_mesh_load( std::string const &model_file, int priority = 0 );
+
+void
+request_pack_mesh_load_paths(
+    std::vector<std::string> const &model_files,
+    std::size_t max_enqueue = 0,
+    int priority = 0 );
+
+[[nodiscard]] TModel3d *
+ensure_pack_mesh_in_session_cache(
+    std::string model_file,
+    std::unordered_map<std::string, TModel3d *> &session_cache,
+    PackMeshLoadWait wait = PackMeshLoadWait::NonBlocking,
+    double block_budget_ms = 0.0 );
+
+[[nodiscard]] bool
+try_adopt_pack_mesh_for_slice(
+    std::string model_file,
+    std::unordered_map<std::string, TModel3d *> &session_cache );
+
+[[nodiscard]] std::size_t
+drain_pack_mesh_loader_ready(
+    std::unordered_map<std::string, TModel3d *> &session_cache,
+    std::size_t max_drain = 0 );
+
+[[nodiscard]] std::size_t
+pack_mesh_loader_queue_depth();
+
+[[nodiscard]] std::size_t
+pack_mesh_loader_ready_count();
+
+[[nodiscard]] std::size_t
+pack_mesh_loader_worker_count();
+
+[[nodiscard]] std::size_t
+pump_pack_mesh_loader(
+    double budget_ms = 0.0,
+    std::size_t max_loads = 1 );
+
+} // namespace scene::eu7