diff options
author | Jacques Lucke <jacques@blender.org> | 2021-09-09 13:54:20 +0300 |
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committer | Jacques Lucke <jacques@blender.org> | 2021-09-09 13:54:20 +0300 |
commit | bf47fb40fd6f0ee9386e9936cf213a1049c55b61 (patch) | |
tree | c8bbe7c00b27ac845e4adbc214b7f29ec670a9f3 /source/blender/makesdna/DNA_customdata_types.h | |
parent | 0f6be4e1520087bfe6d1dc98b61d65686ae09b3f (diff) |
Geometry Nodes: fields and anonymous attributes
This implements the initial core framework for fields and anonymous
attributes (also see T91274).
The new functionality is hidden behind the "Geometry Nodes Fields"
feature flag. When enabled in the user preferences, the following
new nodes become available: `Position`, `Index`, `Normal`,
`Set Position` and `Attribute Capture`.
Socket inspection has not been updated to work with fields yet.
Besides these changes at the user level, this patch contains the
ground work for:
* building and evaluating fields at run-time (`FN_fields.hh`) and
* creating and accessing anonymous attributes on geometry
(`BKE_anonymous_attribute.h`).
For evaluating fields we use a new so called multi-function procedure
(`FN_multi_function_procedure.hh`). It allows composing multi-functions
in arbitrary ways and supports efficient evaluation as is required by
fields. See `FN_multi_function_procedure.hh` for more details on how
this evaluation mechanism can be used.
A new `AttributeIDRef` has been added which allows handling named
and anonymous attributes in the same way in many places.
Hans and I worked on this patch together.
Differential Revision: https://developer.blender.org/D12414
Diffstat (limited to 'source/blender/makesdna/DNA_customdata_types.h')
-rw-r--r-- | source/blender/makesdna/DNA_customdata_types.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/source/blender/makesdna/DNA_customdata_types.h b/source/blender/makesdna/DNA_customdata_types.h index e5282409329..6acea8da15f 100644 --- a/source/blender/makesdna/DNA_customdata_types.h +++ b/source/blender/makesdna/DNA_customdata_types.h @@ -31,6 +31,8 @@ extern "C" { #endif +struct AnonymousAttributeID; + /** Descriptor and storage for a custom data layer. */ typedef struct CustomDataLayer { /** Type of data in layer. */ @@ -53,6 +55,13 @@ typedef struct CustomDataLayer { char name[64]; /** Layer data. */ void *data; + /** + * Run-time identifier for this layer. If no one has a strong reference to this id anymore, + * the layer can be removed. The custom data layer only has a weak reference to the id, because + * otherwise there will always be a strong reference and the attribute can't be removed + * automatically. + */ + const struct AnonymousAttributeID *anonymous_id; } CustomDataLayer; #define MAX_CUSTOMDATA_LAYER_NAME 64 |