UDIM: Add support for packing inside .blend files

This completes support for tiled texture packing on the Blender / Cycles
side of things.

Most of these changes fall into one of three categories:
- Updating Image handling code to pack/unpack tiled and multi-view images
- Updating Cycles to handle tiled textures through BlenderImageLoader
- Updating OSL to properly handle textures with multiple slots

Differential Revision: https://developer.blender.org/D14395

1 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/blenloader/intern/versioning_300.c b/source/blender/blenloader/intern/versioning_300.c
index 7fd72fec3d0..de47fe49946 100644
--- a/source/blender/blenloader/intern/versioning_300.c
+++ b/source/blender/blenloader/intern/versioning_300.c
@@ -3034,5 +3034,16 @@ void blo_do_versions_300(FileData *fd, Library *UNUSED(lib), Main *bmain)
         brush->curves_sculpt_settings->points_per_curve = 8;
       }
     }
+
+    /* UDIM Packing. */
+    if (!DNA_struct_elem_find(fd->filesdna, "ImagePackedFile", "int", "tile_number")) {
+      for (Image *ima = bmain->images.first; ima; ima = ima->id.next) {
+        int view;
+        LISTBASE_FOREACH_INDEX (ImagePackedFile *, imapf, &ima->packedfiles, view) {
+          imapf->view = view;
+          imapf->tile_number = 1001;
+        }
+      }
+    }
   }
 }