T39690: Modifications to Blender's 'temp dir' system.

Current temporary data of Blender suffers one major issue - default 'temp' dir on Windows is never
automatically cleaned up, and can end being quite big when used by Blender, especially when we have
to store per-process data (using getpid() in file names).

To address this, this patch:
* Divides tempdir paths in two, one for 'base' temp dir (the same as previous unique tempdir path),
  the other is a mkdtemp-generated sub-dir, specific to each Blender instance.
* Only uses base tempdir when we need some shallow persistance accross Blender sessions - and we always
  reuse the same filename (quit.blend...) or generate small file (crash reports...).
* Uses temp sub-dir for heavy files like pointcache or renderEXRs (Save Buffer option).
* Erases temp sub-dir on quit or crash.

To get this working it also adds a working 'recursive delete' to BLI_delete() under Windows.

Note that, as in current code, the 'recover render result' hack-feature that was possible
with SaveBuffer option is still removed. A real renderresult cache feature will be added
soon, though.

Reviewers: campbellbarton, brecht, sergey

Reviewed By: campbellbarton, sergey

CC: sergey

Differential Revision: https://developer.blender.org/D531

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/compositor/intern/COM_Debug.cpp b/source/blender/compositor/intern/COM_Debug.cpp
index a453af5ad13..470f8fd2ef7 100644
--- a/source/blender/compositor/intern/COM_Debug.cpp
+++ b/source/blender/compositor/intern/COM_Debug.cpp
@@ -398,7 +398,7 @@ void DebugInfo::graphviz(const ExecutionSystem *system)
 		char filename[FILE_MAX];
 		
 		BLI_snprintf(basename, sizeof(basename), "compositor_%d.dot", m_file_index);
-		BLI_join_dirfile(filename, sizeof(filename), BLI_temporary_dir(), basename);
+		BLI_join_dirfile(filename, sizeof(filename), BLI_temp_dir_session(), basename);
 		++m_file_index;
 		
 		FILE *fp = BLI_fopen(filename, "wb");