Add GDExtension support to Script

* Ability to create script languages from GDExtension
* Some additions to gdnative_extension.h to make this happen
* Moved the GDExtension binder to core

This now allows creating scripting languages from GDExtension, with the same ease as if it was a module. It replaces the old PluginScript from Godot 3.x.
Warning: GodotCPP will need to be updated to support this (it may be a bit of work as ScriptInstance needs to be created over there again).

1 files changed, 12 insertions, 0 deletions

diff --git a/core/extension/gdnative_interface.cpp b/core/extension/gdnative_interface.cpp
index d0461611ec..b5b340731d 100644
--- a/core/extension/gdnative_interface.cpp
+++ b/core/extension/gdnative_interface.cpp
@@ -32,6 +32,7 @@
 
 #include "core/config/engine.h"
 #include "core/object/class_db.h"
+#include "core/object/script_language_extension.h"
 #include "core/os/memory.h"
 #include "core/variant/variant.h"
 #include "core/version.h"
@@ -864,6 +865,13 @@ static GDObjectInstanceID gdnative_object_get_instance_id(const GDNativeObjectPt
 	return (GDObjectInstanceID)o->get_instance_id();
 }
 
+static GDNativeScriptInstancePtr gdnative_script_instance_create(const GDNativeExtensionScriptInstanceInfo *p_info, GDNativeExtensionScriptInstanceDataPtr p_instance_data) {
+	ScriptInstanceExtension *script_instance_extension = memnew(ScriptInstanceExtension);
+	script_instance_extension->instance = p_instance_data;
+	script_instance_extension->native_info = p_info;
+	return reinterpret_cast<GDNativeScriptInstancePtr>(script_instance_extension);
+}
+
 static GDNativeMethodBindPtr gdnative_classdb_get_method_bind(const char *p_classname, const char *p_methodname, GDNativeInt p_hash) {
 	MethodBind *mb = ClassDB::get_method(StringName(p_classname), StringName(p_methodname));
 	ERR_FAIL_COND_V(!mb, nullptr);
@@ -1032,6 +1040,10 @@ void gdnative_setup_interface(GDNativeInterface *p_interface) {
 	gdni.object_get_instance_from_id = gdnative_object_get_instance_from_id;
 	gdni.object_get_instance_id = gdnative_object_get_instance_id;
 
+	/* SCRIPT INSTANCE */
+
+	gdni.script_instance_create = gdnative_script_instance_create;
+
 	/* CLASSDB */
 
 	gdni.classdb_construct_object = gdnative_classdb_construct_object;