Nodes: Defaults for Integer Math node depend on operation

When adding an Integer Math node, the inputs are initialized to 1 or 0
depending on the operation.

Defaults:

1st and 2nd inputs set to 1:
- Multiply
- Divide
- Divide Round
- Divide Floor
- Divide Ceil
- Floored Modulo
- Modulo

1st input to 1, 2nd to 0:
- Multiply Add

Pull Request: https://projects.blender.org/blender/blender/pulls/156823

scripts/startup/bl_ui/node_add_menu.py

@@ -13,7 +13,8 @@ __all__ = (
     "add_repeat_zone",
     "add_simulation_zone",
     "draw_node_group_add_menu",
-    "set_math_node_default_props"
+    "set_math_node_default_props",
+    "set_int_math_node_default_props",
 )
 
 import bpy
@@ -140,6 +141,23 @@ def set_math_node_default_props(enum_identifier, props):
         set_socket_default_value(props.settings, "Value_002", "0.0")
 
 
+def set_int_math_node_default_props(enum_identifier, props):
+    if enum_identifier in (
+        'MULTIPLY',
+        'DIVIDE',
+        'DIVIDE_ROUND',
+        'DIVIDE_FLOOR',
+        'DIVIDE_CEIL',
+        'FLOORED_MODULO',
+            'MODULO'):
+        set_socket_default_value(props.settings, "Value", "1")
+        set_socket_default_value(props.settings, "Value_001", "1")
+
+    elif enum_identifier == 'MULTIPLY_ADD':
+        set_socket_default_value(props.settings, "Value", "1")
+        set_socket_default_value(props.settings, "Value_001", "0")
+
+
 class NodeMenu(Menu):
     """A base-class defining the shared methods for AddNodeMenu and SwapNodeMenu."""
     draw_assets: bool

scripts/startup/bl_ui/node_add_menu_geometry.py

@@ -851,7 +851,12 @@ class NODE_MT_gn_utilities_math_base(node_add_menu.NodeMenu):
             context, layout, "FunctionNodeBitMath", "operation", search_weight=-1.0,
         )
         self.node_operator_with_searchable_enum(context, layout, "FunctionNodeBooleanMath", "operation")
-        self.node_operator_with_searchable_enum(context, layout, "FunctionNodeIntegerMath", "operation")
+        self.node_operator_with_searchable_enum(
+            context,
+            layout,
+            "FunctionNodeIntegerMath",
+            "operation",
+            defaults_callback=node_add_menu.set_int_math_node_default_props)
         self.node_operator(layout, "ShaderNodeClamp")
         self.node_operator(layout, "FunctionNodeCompare")
         self.node_operator(layout, "ShaderNodeFloatCurve")