Merge pull request godotengine#109116 from WhalesState/scene-preview-headless

Prevent generating Editor 3D scene preview in headless mode.

Author: Repiteo

editor/editor_interface.cpp

@@ -230,9 +230,12 @@ Vector<Ref<Texture2D>> EditorInterface::make_mesh_previews(const Vector<Ref<Mesh
 }
 
 void EditorInterface::make_scene_preview(const String &p_path, Node *p_scene, int p_preview_size) {
-	ERR_FAIL_NULL_MSG(p_scene, "The provided scene is null.");
+	if (!Engine::get_singleton()->is_editor_hint() || !DisplayServer::get_singleton()->window_can_draw()) {
+		return;
+	}
+	ERR_FAIL_COND_MSG(p_path.is_empty(), "Path is empty, cannot generate preview.");
+	ERR_FAIL_NULL_MSG(p_scene, "The provided scene is null, cannot generate preview.");
 	ERR_FAIL_COND_MSG(p_scene->is_inside_tree(), "The scene must not be inside the tree.");
-	ERR_FAIL_COND_MSG(!Engine::get_singleton()->is_editor_hint(), "This function can only be called from the editor.");
 	ERR_FAIL_NULL_MSG(EditorNode::get_singleton(), "EditorNode doesn't exist.");
 
 	SubViewport *sub_viewport_node = memnew(SubViewport);

editor/import/3d/resource_importer_scene.cpp

@@ -2963,15 +2963,6 @@ void ResourceImporterScene::_optimize_track_usage(AnimationPlayer *p_player, Ani
 	}
 }
 
-void ResourceImporterScene::_generate_editor_preview_for_scene(const String &p_path, Node *p_scene) {
-	if (!Engine::get_singleton()->is_editor_hint()) {
-		return;
-	}
-	ERR_FAIL_COND_MSG(p_path.is_empty(), "Path is empty, cannot generate preview.");
-	ERR_FAIL_NULL_MSG(p_scene, "Scene is null, cannot generate preview.");
-	EditorInterface::get_singleton()->make_scene_preview(p_path, p_scene, 1024);
-}
-
 Node *ResourceImporterScene::pre_import(const String &p_source_file, const HashMap<StringName, Variant> &p_options) {
 	Ref<EditorSceneFormatImporter> importer;
 	String ext = p_source_file.get_extension().to_lower();
@@ -3359,7 +3350,7 @@ Error ResourceImporterScene::import(ResourceUID::ID p_source_id, const String &p
 		print_verbose("Saving scene to: " + p_save_path + ".scn");
 		err = ResourceSaver::save(packer, p_save_path + ".scn", flags); //do not take over, let the changed files reload themselves
 		ERR_FAIL_COND_V_MSG(err != OK, err, "Cannot save scene to file '" + p_save_path + ".scn'.");
-		_generate_editor_preview_for_scene(p_source_file, scene);
+		EditorInterface::get_singleton()->make_scene_preview(p_source_file, scene, 1024);
 	} else {
 		ERR_FAIL_V_MSG(ERR_FILE_UNRECOGNIZED, "Unknown scene import type: " + _scene_import_type);
 	}

editor/import/3d/resource_importer_scene.h

@@ -232,7 +232,6 @@ class ResourceImporterScene : public ResourceImporter {
 	};
 
 	void _optimize_track_usage(AnimationPlayer *p_player, AnimationImportTracks *p_track_actions);
-	void _generate_editor_preview_for_scene(const String &p_path, Node *p_scene);
 
 	String _scene_import_type = "PackedScene";