tried making naming more uniform and implemented most of the opengl managers

include/assets/file_parsers/obj_loader.hpp

@@ -0,0 +1,82 @@
+#pragma once
+
+#include <filesystem>
+#include <system_error>
+#include <string_view>
+#include "../data_loaders"
+#include "../data_stores"
+#include "assets/prefetch_lookup.hpp"
+#include <set>
+
+namespace obj_loader_error {
+
+enum class codes {
+	ok = 0,
+	cannot_open_file,
+	malformed_vertex,
+	malformed_texture_coordinate,
+	malformed_normal,
+	malformed_face,
+	face_index_out_of_range,
+	unknown_line_begin,
+	use_material_without_material_library,
+	unknown_material_name
+};
+
+} // namespace obj_loader_error
+
+struct obj_loader {
+
+	static constexpr auto name = std::string_view("obj");
+
+	[[nodiscard]] static std::error_code prefetch(
+		const file_dir_list& paths,
+		prefetch_queue& queue
+	);
+
+	[[nodiscard]] static std::error_code load(
+		dynamic_mesh_buffer& buffer,
+		const file_dir_list& paths,
+		prefetch_lookup& id_lookup,
+		dynamic_shader_source_store& store,
+		bool pedantic = false
+	);
+
+protected:
+	using index_type = dynamic_mesh_buffer::index_type;
+	using vertex_type = std::array<index_type, 3>;
+
+	struct indexed_vertex_type
+	{
+		vertex_type vertex;
+		index_type buffer_index;
+
+		friend auto operator<=>(const indexed_vertex_type& a, const indexed_vertex_type& b) {
+			return a.vertex <=> b.vertex;
+		}
+
+		bool operator==(const indexed_vertex_type& other) const noexcept {
+			return other.vertex == vertex;
+		}
+	};
+
+	static void find_materials(
+		std::span<char> buffer,
+		std::filesystem::path& path_buffer,
+		const std::filesystem::path& base_directory,
+		std::ifstream& in,
+		ztu::string_list& material_filenames
+	);
+
+	[[nodiscard]] static std::error_code obj_loader::parse_file(
+		dynamic_mesh_buffer& read_buffer,
+		dynamic_mesh_buffer& mesh_buffer,
+		std::filesystem::path& path_buffer,
+		const std::filesystem::path& base_directory,
+		std::set<indexed_vertex_type>& vertex_ids,
+		std::ifstream& in,
+		prefetch_lookup& id_lookup,
+		dynamic_shader_source_store& store,
+		bool pedantic
+	);
+};