Alembic: add support for reading override layers

Override layers are a standard feature of Alembic, where archives can override
data from other archives, provided that the hierarchies match.

This is useful for modifying a UV map, updating an animation, or even creating
some sort of LOD system where low resolution meshes are swapped by high resolution
versions.

It is possible to add UV maps and vertex colors using this system, however, they
will only appear in the spreadsheet editor when viewing evaluated data, as the UV
map and Vertex color UI only show data present on the original mesh.

Implementation wise, this adds a `CacheFileLayer` data structure to the `CacheFile`
DNA, as well as some operators and UI to present and manage the layers. For both
the Alembic importer and the Cycles procedural, the main change is creating an
archive from a list of filepaths, instead of a single one.

After importing the base file through the regular import operator, layers can be added
to or removed from the `CacheFile` via the UI list under the `Override Layers` panel
located in the Mesh Sequence Cache modifier. Layers can also be moved around or
hidden.

See differential page for tests files and demos.

Reviewed by: brecht, sybren

Differential Revision: https://developer.blender.org/D13603

1 files changed, 18 insertions, 1 deletions

diff --git a/source/blender/makesdna/DNA_cachefile_types.h b/source/blender/makesdna/DNA_cachefile_types.h
index 0f4c53a6e7e..65e1dd6c096 100644
--- a/source/blender/makesdna/DNA_cachefile_types.h
+++ b/source/blender/makesdna/DNA_cachefile_types.h
@@ -59,6 +59,18 @@ typedef struct CacheObjectPath {
   char path[4096];
 } CacheObjectPath;
 
+/* CacheFileLayer::flag */
+enum { CACHEFILE_LAYER_HIDDEN = (1 << 0) };
+
+typedef struct CacheFileLayer {
+  struct CacheFileLayer *next, *prev;
+
+  /** 1024 = FILE_MAX. */
+  char filepath[1024];
+  int flag;
+  int _pad;
+} CacheFileLayer;
+
 /* CacheFile::velocity_unit
  * Determines what temporal unit is used to interpret velocity vectors for motion blur effects. */
 enum {
@@ -73,6 +85,8 @@ typedef struct CacheFile {
   /** Paths of the objects inside of the archive referenced by this CacheFile. */
   ListBase object_paths;
 
+  ListBase layers;
+
   /** 1024 = FILE_MAX. */
   char filepath[1024];
 
@@ -109,7 +123,10 @@ typedef struct CacheFile {
   /** Size in megabytes for the prefetch cache used by the Cycles Procedural. */
   int prefetch_cache_size;
 
-  char _pad2[7];
+  /** Index of the currently selected layer in the UI, starts at 1. */
+  int active_layer;
+
+  char _pad2[3];
 
   char velocity_unit;
   /* Name of the velocity property in the archive. */