Geometry Nodes: new Is Viewport node

This node outputs true when geometry nodes is currently evaluated
for the viewport and false for final renders.

Ref T85277.

Differential Revision: https://developer.blender.org/D10302

source/blender/blenkernel/BKE_node.h

@@ -1365,6 +1365,7 @@ int ntreeTexExecTree(struct bNodeTree *ntree,
 #define GEO_NODE_ATTRIBUTE_SAMPLE_TEXTURE 1021
 #define GEO_NODE_POINTS_TO_VOLUME 1022
 #define GEO_NODE_COLLECTION_INFO 1023
+#define GEO_NODE_IS_VIEWPORT 1024
 
 /** \} */
 

source/blender/blenkernel/intern/node.cc

@@ -4774,6 +4774,7 @@ static void registerGeometryNodes()
   register_node_type_geo_sample_texture();
   register_node_type_geo_points_to_volume();
   register_node_type_geo_collection_info();
+  register_node_type_geo_is_viewport();
 }
 
 static void registerFunctionNodes()