Geometry Nodes: new Viewer node

This adds a viewer node similar to the one in the compositor.
The icon in the headers of nodes is removed because it served
the same purpose and is not necessary anymore.

Node outputs can be connected to the active viewer using
ctrl+shift+LMB, just like in the compositor. Right now this collides
with the shortcut used in the node wrangler addon, which will
be changed separately.

As of now, the viewed geometry is only visible in the spreadsheet.
Viewport visualization will be added separately.

There are a couple of benefits of using a viewer node compared
to the old approach with the icon in the node header:
* Better support for nodes that have more than one geometry output.
* It's more consistent with the compositor.
* If attributes become decoupled from geometry in the future,
  the viewer can have a separate input for the attribute to visualize.
* The viewer node could potentially have visualization settings.
* Allows to keep "visualization points" around by having multiple
  viewer nodes.
* Less visual clutter in node headers.

Differential Revision: https://developer.blender.org/D11470

1 files changed, 18 insertions, 4 deletions

diff --git a/source/blender/editors/include/ED_spreadsheet.h b/source/blender/editors/include/ED_spreadsheet.h
index 88bc4738c0b..ff77135a51c 100644
--- a/source/blender/editors/include/ED_spreadsheet.h
+++ b/source/blender/editors/include/ED_spreadsheet.h
@@ -21,6 +21,9 @@ struct SpaceSpreadsheet;
 struct SpaceNode;
 struct ID;
 struct bNode;
+struct Main;
+struct bContext;
+struct Object;
 
 #ifdef __cplusplus
 extern "C" {
@@ -29,14 +32,25 @@ extern "C" {
 struct SpreadsheetContext *ED_spreadsheet_context_new(int type);
 void ED_spreadsheet_context_free(struct SpreadsheetContext *context);
 void ED_spreadsheet_context_path_clear(struct SpaceSpreadsheet *sspreadsheet);
-void ED_spreadsheet_context_path_update_tag(struct SpaceSpreadsheet *sspreadsheet);
+bool ED_spreadsheet_context_path_update_tag(struct SpaceSpreadsheet *sspreadsheet);
 uint64_t ED_spreadsheet_context_path_hash(const struct SpaceSpreadsheet *sspreadsheet);
 
 struct ID *ED_spreadsheet_get_current_id(const struct SpaceSpreadsheet *sspreadsheet);
 
-void ED_spreadsheet_set_geometry_node_context(struct SpaceSpreadsheet *sspreadsheet,
-                                              struct SpaceNode *snode,
-                                              struct bNode *node);
+void ED_spreadsheet_context_path_set_geometry_node(struct SpaceSpreadsheet *sspreadsheet,
+                                                   struct SpaceNode *snode,
+                                                   struct bNode *node);
+void ED_spreadsheet_context_paths_set_geometry_node(struct Main *bmain,
+                                                    struct SpaceNode *snode,
+                                                    struct bNode *node);
+void ED_spreadsheet_context_path_set_evaluated_object(struct SpaceSpreadsheet *sspreadsheet,
+                                                      struct Object *object);
+
+void ED_spreadsheet_context_path_guess(const struct bContext *C,
+                                       struct SpaceSpreadsheet *sspreadsheet);
+bool ED_spreadsheet_context_path_is_active(const struct bContext *C,
+                                           struct SpaceSpreadsheet *sspreadsheet);
+bool ED_spreadsheet_context_path_exists(struct Main *bmain, struct SpaceSpreadsheet *sspreadsheet);
 
 #ifdef __cplusplus
 }