Implement glTF compat version system for files from older Godot versions

4 files changed, 48 insertions, 6 deletions

diff --git a/modules/gltf/editor/editor_scene_importer_gltf.cpp b/modules/gltf/editor/editor_scene_importer_gltf.cpp
index ae2bd1f580..e35c0e9b9b 100644
--- a/modules/gltf/editor/editor_scene_importer_gltf.cpp
+++ b/modules/gltf/editor/editor_scene_importer_gltf.cpp
@@ -51,6 +51,10 @@ Node *EditorSceneFormatImporterGLTF::import_scene(const String &p_path, uint32_t
 	gltf.instantiate();
 	Ref<GLTFState> state;
 	state.instantiate();
+	if (p_options.has("gltf/naming_version")) {
+		int naming_version = p_options["gltf/naming_version"];
+		gltf->set_naming_version(naming_version);
+	}
 	if (p_options.has("gltf/embedded_image_handling")) {
 		int32_t enum_option = p_options["gltf/embedded_image_handling"];
 		state->set_handle_binary_image(enum_option);
@@ -77,7 +81,16 @@ Node *EditorSceneFormatImporterGLTF::import_scene(const String &p_path, uint32_t
 
 void EditorSceneFormatImporterGLTF::get_import_options(const String &p_path,
 		List<ResourceImporter::ImportOption> *r_options) {
+	r_options->push_back(ResourceImporterScene::ImportOption(PropertyInfo(Variant::INT, "gltf/naming_version", PROPERTY_HINT_ENUM, "Godot 4.1 or 4.0,Godot 4.2 or later"), 1));
 	r_options->push_back(ResourceImporterScene::ImportOption(PropertyInfo(Variant::INT, "gltf/embedded_image_handling", PROPERTY_HINT_ENUM, "Discard All Textures,Extract Textures,Embed as Basis Universal,Embed as Uncompressed", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), GLTFState::HANDLE_BINARY_EXTRACT_TEXTURES));
 }
 
+void EditorSceneFormatImporterGLTF::handle_compatibility_options(HashMap<StringName, Variant> &p_import_params) const {
+	if (!p_import_params.has("gltf/naming_version")) {
+		// If an existing import file is missing the glTF
+		// compatibility version, we need to use version 0.
+		p_import_params["gltf/naming_version"] = 0;
+	}
+}
+
 #endif // TOOLS_ENABLED
diff --git a/modules/gltf/editor/editor_scene_importer_gltf.h b/modules/gltf/editor/editor_scene_importer_gltf.h
index ed57ec8cdb..7726c845bf 100644
--- a/modules/gltf/editor/editor_scene_importer_gltf.h
+++ b/modules/gltf/editor/editor_scene_importer_gltf.h
@@ -49,6 +49,7 @@ public:
 			List<String> *r_missing_deps, Error *r_err = nullptr) override;
 	virtual void get_import_options(const String &p_path,
 			List<ResourceImporter::ImportOption> *r_options) override;
+	virtual void handle_compatibility_options(HashMap<StringName, Variant> &p_import_params) const override;
 };
 
 #endif // TOOLS_ENABLED
diff --git a/modules/gltf/gltf_document.cpp b/modules/gltf/gltf_document.cpp
index 90280e0372..b5adea7da0 100644
--- a/modules/gltf/gltf_document.cpp
+++ b/modules/gltf/gltf_document.cpp
@@ -576,6 +576,9 @@ Error GLTFDocument::_parse_scenes(Ref<GLTFState> p_state) {
 		} else {
 			p_state->scene_name = p_state->filename;
 		}
+		if (_naming_version == 0) {
+			p_state->scene_name = _gen_unique_name(p_state, p_state->scene_name);
+		}
 	}
 
 	return OK;
@@ -3023,6 +3026,14 @@ Error GLTFDocument::_parse_meshes(Ref<GLTFState> p_state) {
 	return OK;
 }
 
+void GLTFDocument::set_naming_version(int p_version) {
+	_naming_version = p_version;
+}
+
+int GLTFDocument::get_naming_version() const {
+	return _naming_version;
+}
+
 void GLTFDocument::set_image_format(const String &p_image_format) {
 	_image_format = p_image_format;
 }
@@ -5358,12 +5369,22 @@ void GLTFDocument::_assign_node_names(Ref<GLTFState> p_state) {
 		}
 		String gltf_node_name = gltf_node->get_name();
 		if (gltf_node_name.is_empty()) {
-			if (gltf_node->mesh >= 0) {
-				gltf_node_name = "Mesh";
-			} else if (gltf_node->camera >= 0) {
-				gltf_node_name = "Camera";
+			if (_naming_version == 0) {
+				if (gltf_node->mesh >= 0) {
+					gltf_node_name = _gen_unique_name(p_state, "Mesh");
+				} else if (gltf_node->camera >= 0) {
+					gltf_node_name = _gen_unique_name(p_state, "Camera3D");
+				} else {
+					gltf_node_name = _gen_unique_name(p_state, "Node");
+				}
 			} else {
-				gltf_node_name = "Node";
+				if (gltf_node->mesh >= 0) {
+					gltf_node_name = "Mesh";
+				} else if (gltf_node->camera >= 0) {
+					gltf_node_name = "Camera";
+				} else {
+					gltf_node_name = "Node";
+				}
 			}
 		}
 		gltf_node->set_name(_gen_unique_name(p_state, gltf_node_name));
@@ -7405,7 +7426,11 @@ Node *GLTFDocument::_generate_scene_node_tree(Ref<GLTFState> p_state) {
 	if (unlikely(p_state->scene_name.is_empty())) {
 		p_state->scene_name = single_root->get_name();
 	} else if (single_root->get_name() == StringName()) {
-		single_root->set_name(_gen_unique_name(p_state, p_state->scene_name));
+		if (_naming_version == 0) {
+			single_root->set_name(p_state->scene_name);
+		} else {
+			single_root->set_name(_gen_unique_name(p_state, p_state->scene_name));
+		}
 	}
 	return single_root;
 }
diff --git a/modules/gltf/gltf_document.h b/modules/gltf/gltf_document.h
index 828d650cff..7e378fe94d 100644
--- a/modules/gltf/gltf_document.h
+++ b/modules/gltf/gltf_document.h
@@ -73,6 +73,7 @@ public:
 
 private:
 	const float BAKE_FPS = 30.0f;
+	int _naming_version = 1;
 	String _image_format = "PNG";
 	float _lossy_quality = 0.75f;
 	Ref<GLTFDocumentExtension> _image_save_extension;
@@ -86,6 +87,8 @@ public:
 	static void unregister_gltf_document_extension(Ref<GLTFDocumentExtension> p_extension);
 	static void unregister_all_gltf_document_extensions();
 
+	void set_naming_version(int p_version);
+	int get_naming_version() const;
 	void set_image_format(const String &p_image_format);
 	String get_image_format() const;
 	void set_lossy_quality(float p_lossy_quality);