initial asset importer draft

Tetragrama/src/Importers/IAssetImporter.h

@@ -0,0 +1,51 @@
+#pragma once
+#include <atomic>
+#include <mutex>
+#include <future>
+#include <string>
+#include <Helpers/IntrusivePtr.h>
+
+namespace Tetragrama::Importers
+{
+    struct IAssetImporter : public ZEngine::Helpers::RefCounted
+    {
+    protected:
+        typedef void (*on_import_complete_fn)(const void* const result);
+        typedef void (*on_import_progress_fn)(float progress);
+        typedef void (*on_import_error_fn)(std::string_view error_message);
+
+        on_import_complete_fn m_complete_callback{nullptr};
+        on_import_progress_fn m_progress_callback{nullptr};
+        on_import_error_fn    m_error_callback{nullptr};
+
+        std::mutex       m_mutex;
+        std::atomic_bool m_is_importing{false};
+
+    public:
+        virtual ~IAssetImporter() = default;
+
+        virtual void SetOnCompleteCallback(on_import_complete_fn callback)
+        {
+            m_complete_callback = callback;
+        }
+
+        virtual void SetOnProgressCallback(on_import_progress_fn callback)
+        {
+            m_progress_callback = callback;
+        }
+
+        virtual void SetOnErrorCallback(on_import_error_fn callback)
+        {
+            m_error_callback = callback;
+        }
+
+        virtual bool IsImporting()
+        {
+            std::lock_guard l(m_mutex);
+            return m_is_importing;
+        }
+
+        virtual std::future<void> ImportAsync(std::string_view filename) = 0;
+    };
+
+} // namespace Tetragrama::Importers