OBJ: New C++ based wavefront OBJ importer

This takes state of soc-2020-io-performance branch as it was at
e9bbfd0c8c7 (2021 Oct 31), merges latest master (2022 Apr 4),
adds a bunch of tests, and fixes a bunch of stuff found by said
tests. The fixes are detailed in the differential.

Timings on my machine (Windows, VS2022 release build, AMD Ryzen
5950X 32 threads):

- Rungholt minecraft level (269MB file, 1 mesh): 54.2s -> 14.2s
  (memory usage: 7.0GB -> 1.9GB).
- Blender 3.0 splash scene: "I waited for 90 minutes and gave up"
  -> 109s. Now, this time is not great, but at least 20% of the
  time is spent assigning unique names for the imported objects
  (the scene has 24 thousand objects). This is not specific to obj
  importer, but rather a general issue across blender overall.

Test suite file updates done in Subversion tests repository.

Reviewed By: @howardt, @sybren
Differential Revision: https://developer.blender.org/D13958

1 files changed, 10 insertions, 0 deletions

diff --git a/source/blender/io/wavefront_obj/IO_wavefront_obj.cc b/source/blender/io/wavefront_obj/IO_wavefront_obj.cc
index cebdf33413e..c80d10d9efd 100644
--- a/source/blender/io/wavefront_obj/IO_wavefront_obj.cc
+++ b/source/blender/io/wavefront_obj/IO_wavefront_obj.cc
@@ -9,6 +9,7 @@
 #include "IO_wavefront_obj.h"
 
 #include "obj_exporter.hh"
+#include "obj_importer.hh"
 
 /**
  * C-interface for the exporter.
@@ -18,3 +19,12 @@ void OBJ_export(bContext *C, const OBJExportParams *export_params)
   SCOPED_TIMER("OBJ export");
   blender::io::obj::exporter_main(C, *export_params);
 }
+
+/**
+ * Time the full import process.
+ */
+void OBJ_import(bContext *C, const OBJImportParams *import_params)
+{
+  SCOPED_TIMER(__func__);
+  blender::io::obj::importer_main(C, *import_params);
+}