fixes

include/assets/data_loaders/mtl_loader.hpp

@@ -0,0 +1,56 @@
+#pragma once
+
+#include <filesystem>
+#include <system_error>
+
+#include "assets/dynamic_data_store.hpp"
+#include "assets/prefetch_lookup.hpp"
+#include "assets/prefetch_queue.hpp"
+#include "assets/dynamic_read_buffers/dynamic_material_buffer.hpp"
+#include "assets/dynamic_data_stores/dynamic_material_library_store.hpp"
+#include "assets/dynamic_data_stores/dynamic_material_store.hpp"
+#include "util/string_lookup.hpp"
+#include "util/result.hpp"
+
+namespace mtl_loader_error {
+
+enum class codes {
+	ok = 0,
+	mtl_cannot_open_file,
+	mtl_cannot_open_texture,
+	mtl_malformed_ambient_color,
+	mtl_malformed_diffuse_color,
+	mtl_malformed_specular_color,
+	mtl_malformed_specular_exponent,
+	mtl_malformed_dissolve,
+	mlt_unknown_line_begin
+};
+
+} // namespace mtl_loader_error
+
+class mtl_loader {
+public:
+	static constexpr auto name = std::string_view("mtl");
+
+	std::optional<dynamic_material_store::id_type> find_id(std::string_view name);
+
+	void clear_name_lookup();
+
+	[[nodiscard]] static std::error_code prefetch(
+		const file_dir_list& paths,
+		prefetch_queue& queue
+	);
+
+	// THis is not very elegant, but right now I do not see a better solution...
+	[[nodiscard]] static std::error_code load(
+		dynamic_material_library_buffer& material_library_buffer,
+		const file_dir_list& paths,
+		prefetch_lookup& id_lookup,
+		dynamic_data_store& store,
+		bool pedantic = false
+	);
+
+
+private:
+	ztu::string_lookup<dynamic_material_store::id_type> m_id_lookup;
+};