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, 12 insertions, 16 deletions

diff --git a/source/blender/makesrna/intern/rna_space.c b/source/blender/makesrna/intern/rna_space.c
index 8b2927019dd..c05842d3cfe 100644
--- a/source/blender/makesrna/intern/rna_space.c
+++ b/source/blender/makesrna/intern/rna_space.c
@@ -3177,11 +3177,9 @@ static void rna_spreadsheet_context_update(Main *UNUSED(bmain),
   }
 }
 
-static void rna_spreadsheet_set_geometry_node_context(SpaceSpreadsheet *sspreadsheet,
-                                                      SpaceNode *snode,
-                                                      bNode *node)
+static void rna_SpaceSpreadsheet_context_path_guess(SpaceSpreadsheet *sspreadsheet, bContext *C)
 {
-  ED_spreadsheet_set_geometry_node_context(sspreadsheet, snode, node);
+  ED_spreadsheet_context_path_guess(C, sspreadsheet);
   ED_spreadsheet_context_path_update_tag(sspreadsheet);
   WM_main_add_notifier(NC_SPACE | ND_SPACE_SPREADSHEET, NULL);
 }
@@ -7646,13 +7644,16 @@ static void rna_def_space_spreadsheet_context_path(BlenderRNA *brna, PropertyRNA
 
   func = RNA_def_function(srna, "clear", "rna_SpaceSpreadsheet_context_path_clear");
   RNA_def_function_ui_description(func, "Clear entire context path");
+
+  func = RNA_def_function(srna, "guess", "rna_SpaceSpreadsheet_context_path_guess");
+  RNA_def_function_ui_description(func, "Guess the context path from the current context");
+  RNA_def_function_flag(func, FUNC_USE_CONTEXT);
 }
 
 static void rna_def_space_spreadsheet(BlenderRNA *brna)
 {
-  PropertyRNA *prop, *parm;
+  PropertyRNA *prop;
   StructRNA *srna;
-  FunctionRNA *func;
 
   static const EnumPropertyItem geometry_component_type_items[] = {
       {GEO_COMPONENT_TYPE_MESH,
@@ -7689,6 +7690,11 @@ static void rna_def_space_spreadsheet(BlenderRNA *brna)
        ICON_NONE,
        "Original",
        "Use data from original object without any modifiers applied"},
+      {SPREADSHEET_OBJECT_EVAL_STATE_VIEWER_NODE,
+       "VIEWER_NODE",
+       ICON_NONE,
+       "Viewer Node",
+       "Use intermediate data from viewer node"},
       {0, NULL, 0, NULL, NULL},
   };
 
@@ -7764,16 +7770,6 @@ static void rna_def_space_spreadsheet(BlenderRNA *brna)
   RNA_def_property_struct_type(prop, "SpreadsheetRowFilter");
   RNA_def_property_ui_text(prop, "Row Filters", "Filters to remove rows from the displayed data");
   RNA_def_property_update(prop, NC_SPACE | ND_SPACE_SPREADSHEET, NULL);
-
-  func = RNA_def_function(
-      srna, "set_geometry_node_context", "rna_spreadsheet_set_geometry_node_context");
-  RNA_def_function_ui_description(
-      func, "Update context_path to point to a specific node in a node editor");
-  parm = RNA_def_pointer(
-      func, "node_editor", "SpaceNodeEditor", "", "Editor to take the context from");
-  RNA_def_parameter_flags(parm, 0, PARM_REQUIRED);
-  parm = RNA_def_pointer(func, "node", "Node", "", "");
-  RNA_def_parameter_flags(parm, 0, PARM_REQUIRED);
 }
 
 void RNA_def_space(BlenderRNA *brna)