Added a new TMeshInstance class (inherited from MeshInstance). All it does is allows me to call _initialize_skinning and _is_software_skinning_enabled from gdscript, because without calling these explicitly, gpu skinning doesn't seem to work properly. Not yet 100% sure if its a regression, or I'm just supposed to do things now differently.

SCsub

@@ -14,7 +14,9 @@ sources = [
 
     "register_types.cpp",
 
-    "biome_terrarin_generator.cpp"
+    "biome_terrarin_generator.cpp",
+    "t_mesh_instance.cpp"
+
 ]
 
 if ARGUMENTS.get('custom_modules_shared', 'no') == 'yes':

register_types.cpp

@@ -25,9 +25,11 @@ SOFTWARE.
 */
 
 #include "biome_terrarin_generator.h"
+#include "t_mesh_instance.h"
 
 void register_broken_seals_module_types() {
 	ClassDB::register_class<BiomeTerrarinGenerator>();
+	ClassDB::register_class<TMeshInstance>();
 }
 
 void unregister_broken_seals_module_types() {

t_mesh_instance.cpp

@@ -0,0 +1,50 @@
+/*************************************************************************/
+/*  mesh_instance.cpp                                                    */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#include "t_mesh_instance.h"
+
+bool TMeshInstance::is_software_skinning_enabled() {
+	return _is_software_skinning_enabled();
+}
+
+void TMeshInstance::initialize_skinning(bool p_force_reset, bool p_call_attach_skeleton) {
+	_initialize_skinning(p_force_reset, p_call_attach_skeleton);
+}
+
+void TMeshInstance::_bind_methods() {
+	ClassDB::bind_method(D_METHOD("is_software_skinning_enabled"), &TMeshInstance::is_software_skinning_enabled);
+	ClassDB::bind_method(D_METHOD("initialize_skinning", "force_reset", "call_attach_skeleton"), &TMeshInstance::initialize_skinning, false, true);
+}
+
+TMeshInstance::TMeshInstance() {
+}
+
+TMeshInstance::~TMeshInstance() {
+}

t_mesh_instance.h

@@ -0,0 +1,57 @@
+/*************************************************************************/
+/*  mesh_instance.h                                                      */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef T_MESH_INSTANCE_H
+#define T_MESH_INSTANCE_H
+
+#include "scene/3d/mesh_instance.h"
+
+#include "scene/3d/skeleton.h"
+#include "scene/3d/visual_instance.h"
+#include "scene/resources/mesh.h"
+#include "scene/resources/skin.h"
+
+#include "core/local_vector.h"
+
+class TMeshInstance : public MeshInstance {
+	GDCLASS(TMeshInstance, MeshInstance);
+
+public:
+	bool is_software_skinning_enabled();
+	void initialize_skinning(bool p_force_reset = false, bool p_call_attach_skeleton = true);
+
+	TMeshInstance();
+	~TMeshInstance();
+
+protected:
+	static void _bind_methods();
+};
+
+#endif