Objects: add Volume object type, and prototypes for Hair and PointCloud

Only the volume object is exposed in the user interface. It is based on OpenVDB
internally. Drawing and rendering code will follow in another commit.
https://wiki.blender.org/wiki/Source/Objects/Volume
https://wiki.blender.org/wiki/Reference/Release_Notes/2.83/Volumes

Hair and PointCloud object types are hidden behind a WITH_NEW_OBJECT_TYPES
build option. These are unfinished, and included only to make it easier to
cooperate on development in the future and avoid tricky merges.
https://wiki.blender.org/wiki/Source/Objects/New_Object_Types

Ref T73201, T68981

Differential Revision: https://developer.blender.org/D6945

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/blenloader/intern/readblenentry.c b/source/blender/blenloader/intern/readblenentry.c
index 085e500f7e5..c12df2bc87d 100644
--- a/source/blender/blenloader/intern/readblenentry.c
+++ b/source/blender/blenloader/intern/readblenentry.c
@@ -402,6 +402,9 @@ BlendFileData *BLO_read_from_memfile(Main *oldmain,
     /* make lookups of existing sound data in old main */
     blo_make_sound_pointer_map(fd, oldmain);
 
+    /* make lookups of existing volume data in old main */
+    blo_make_volume_pointer_map(fd, oldmain);
+
     /* removed packed data from this trick - it's internal data that needs saves */
 
     bfd = blo_read_file_internal(fd, filename);
@@ -418,6 +421,9 @@ BlendFileData *BLO_read_from_memfile(Main *oldmain,
     /* ensures relinked sounds are not freed */
     blo_end_sound_pointer_map(fd, oldmain);
 
+    /* ensures relinked volumes are not freed */
+    blo_end_volume_pointer_map(fd, oldmain);
+
     /* Still in-use libraries have already been moved from oldmain to new mainlist,
      * but oldmain itself shall *never* be 'transferred' to new mainlist! */
     BLI_assert(old_mainlist.first == oldmain);