Move metallic and roughness automated assignment to an inspector UndoRedo

callback.

doc/classes/BaseMaterial3D.xml

@@ -53,7 +53,6 @@
 			<argument index="1" name="texture" type="Texture2D" />
 			<description>
 				Sets the texture for the slot specified by [code]param[/code]. See [enum TextureParam] for available slots.
-				[b]Note:[/b] When setting a roughness or metallic texture on a material that has no texture assigned to those slots, [member roughness] or [member metallic] will automatically be set to [code]1.0[/code] to ensure correct appearance.
 			</description>
 		</method>
 	</methods>
@@ -233,7 +232,6 @@
 		</member>
 		<member name="metallic" type="float" setter="set_metallic" getter="get_metallic" default="0.0">
 			A high value makes the material appear more like a metal. Non-metals use their albedo as the diffuse color and add diffuse to the specular reflection. With non-metals, the reflection appears on top of the albedo color. Metals use their albedo as a multiplier to the specular reflection and set the diffuse color to black resulting in a tinted reflection. Materials work better when fully metal or fully non-metal, values between [code]0[/code] and [code]1[/code] should only be used for blending between metal and non-metal sections. To alter the amount of reflection use [member roughness].
-			[b]Note:[/b] [member metallic] is automatically set to [code]1.0[/code] when assigning a metallic texture using [method set_texture].
 		</member>
 		<member name="metallic_specular" type="float" setter="set_specular" getter="get_specular" default="0.5">
 			Sets the size of the specular lobe. The specular lobe is the bright spot that is reflected from light sources.
@@ -306,7 +304,6 @@
 		</member>
 		<member name="roughness" type="float" setter="set_roughness" getter="get_roughness" default="1.0">
 			Surface reflection. A value of [code]0[/code] represents a perfect mirror while a value of [code]1[/code] completely blurs the reflection. See also [member metallic].
-			[b]Note:[/b] [member roughness] is automatically set to [code]1.0[/code] when assigning a roughness texture using [method set_texture].
 		</member>
 		<member name="roughness_texture" type="Texture2D" setter="set_texture" getter="get_texture">
 			Texture used to control the roughness per-pixel. Multiplied by [member roughness].

editor/plugins/material_editor_plugin.cpp

@@ -254,6 +254,43 @@ void EditorInspectorPluginMaterial::parse_begin(Object *p_object) {
 	add_custom_control(editor);
 }
 
+void EditorInspectorPluginMaterial::_undo_redo_inspector_callback(Object *p_undo_redo, Object *p_edited, String p_property, Variant p_new_value) {
+	UndoRedo *undo_redo = Object::cast_to<UndoRedo>(p_undo_redo);
+	if (!undo_redo) {
+		return;
+	}
+
+	// For BaseMaterial3D, if a roughness or metallic textures is being assigned to an empty slot,
+	// set the respective metallic or roughness factor to 1.0 as a convinence feature
+	BaseMaterial3D *base_material = Object::cast_to<StandardMaterial3D>(p_edited);
+	if (base_material) {
+		Texture2D *texture = Object::cast_to<Texture2D>(p_new_value);
+		if (texture) {
+			if (p_property == "roughness_texture") {
+				if (base_material->get_texture(StandardMaterial3D::TEXTURE_ROUGHNESS).is_null() && texture) {
+					undo_redo->add_do_property(p_edited, "roughness", 1.0);
+
+					bool valid = false;
+					Variant value = p_edited->get("roughness", &valid);
+					if (valid) {
+						undo_redo->add_undo_property(p_edited, "roughness", value);
+					}
+				}
+			} else if (p_property == "metallic_texture") {
+				if (base_material->get_texture(StandardMaterial3D::TEXTURE_METALLIC).is_null() && texture) {
+					undo_redo->add_do_property(p_edited, "metallic", 1.0);
+
+					bool valid = false;
+					Variant value = p_edited->get("metallic", &valid);
+					if (valid) {
+						undo_redo->add_undo_property(p_edited, "metallic", value);
+					}
+				}
+			}
+		}
+	}
+}
+
 EditorInspectorPluginMaterial::EditorInspectorPluginMaterial() {
 	env.instantiate();
 	Ref<Sky> sky = memnew(Sky());
@@ -261,6 +298,8 @@ EditorInspectorPluginMaterial::EditorInspectorPluginMaterial() {
 	env->set_background(Environment::BG_COLOR);
 	env->set_ambient_source(Environment::AMBIENT_SOURCE_SKY);
 	env->set_reflection_source(Environment::REFLECTION_SOURCE_SKY);
+
+	EditorNode::get_singleton()->get_editor_data().add_undo_redo_inspector_hook_callback(callable_mp(this, &EditorInspectorPluginMaterial::_undo_redo_inspector_callback));
 }
 
 MaterialEditorPlugin::MaterialEditorPlugin(EditorNode *p_node) {

editor/plugins/material_editor_plugin.h

@@ -92,6 +92,8 @@ public:
 	virtual bool can_handle(Object *p_object) override;
 	virtual void parse_begin(Object *p_object) override;
 
+	void _undo_redo_inspector_callback(Object *p_undo_redo, Object *p_edited, String p_property, Variant p_new_value);
+
 	EditorInspectorPluginMaterial();
 };
 

scene/resources/material.cpp

@@ -1659,18 +1659,6 @@ bool BaseMaterial3D::get_feature(Feature p_feature) const {
 void BaseMaterial3D::set_texture(TextureParam p_param, const Ref<Texture2D> &p_texture) {
 	ERR_FAIL_INDEX(p_param, TEXTURE_MAX);
 
-	if (get_texture(TEXTURE_ROUGHNESS).is_null() && p_texture.is_valid() && p_param == TEXTURE_ROUGHNESS) {
-		// If no roughness texture is currently set, automatically set the recommended value
-		// for roughness when using a roughness map.
-		set_roughness(1.0);
-	}
-
-	if (get_texture(TEXTURE_METALLIC).is_null() && p_texture.is_valid() && p_param == TEXTURE_METALLIC) {
-		// If no metallic texture is currently set, automatically set the recommended value
-		// for metallic when using a metallic map.
-		set_metallic(1.0);
-	}
-
 	textures[p_param] = p_texture;
 	RID rid = p_texture.is_valid() ? p_texture->get_rid() : RID();
 	RS::get_singleton()->material_set_param(_get_material(), shader_names->texture_names[p_param], rid);