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, 10 insertions, 3 deletions

diff --git a/source/blender/editors/space_node/node_select.cc b/source/blender/editors/space_node/node_select.cc
index 2c8e78de8d2..a081cc83481 100644
--- a/source/blender/editors/space_node/node_select.cc
+++ b/source/blender/editors/space_node/node_select.cc
@@ -44,6 +44,7 @@
 #include "ED_node.h" /* own include */
 #include "ED_screen.h"
 #include "ED_select_utils.h"
+#include "ED_spreadsheet.h"
 #include "ED_view3d.h"
 
 #include "RNA_access.h"
@@ -469,7 +470,7 @@ void node_select_single(bContext *C, bNode *node)
   }
   nodeSetSelected(node, true);
 
-  ED_node_set_active(bmain, snode->edittree, node, &active_texture_changed);
+  ED_node_set_active(bmain, snode, snode->edittree, node, &active_texture_changed);
   ED_node_set_active_viewer_key(snode);
 
   ED_node_sort(snode->edittree);
@@ -606,12 +607,18 @@ static int node_mouse_select(bContext *C,
   /* update node order */
   if (ret_value != OPERATOR_CANCELLED) {
     bool active_texture_changed = false;
+    bool viewer_node_changed = false;
     if (node != nullptr && ret_value != OPERATOR_RUNNING_MODAL) {
-      ED_node_set_active(bmain, snode->edittree, node, &active_texture_changed);
+      viewer_node_changed = (node->flag & NODE_DO_OUTPUT) == 0 && node->type == GEO_NODE_VIEWER;
+      ED_node_set_active(bmain, snode, snode->edittree, node, &active_texture_changed);
+    }
+    else if (node != nullptr && node->type == GEO_NODE_VIEWER) {
+      ED_spreadsheet_context_paths_set_geometry_node(bmain, snode, node);
     }
     ED_node_set_active_viewer_key(snode);
     ED_node_sort(snode->edittree);
-    if (active_texture_changed && has_workbench_in_texture_color(wm, scene, ob)) {
+    if ((active_texture_changed && has_workbench_in_texture_color(wm, scene, ob)) ||
+        viewer_node_changed) {
       DEG_id_tag_update(&snode->edittree->id, ID_RECALC_COPY_ON_WRITE);
     }