Remove ToGodot::into_godot(); Signature marshalling uses to_godot()

godot-core/src/builtin/collections/array.rs

@@ -917,10 +917,6 @@ impl<T: ArrayElement> ToGodot for Array<T> {
         //self.clone()
     }
 
-    fn into_godot(self) -> Self::Via {
-        self
-    }
-
     fn to_variant(&self) -> Variant {
         self.ffi_to_variant()
     }
@@ -1052,8 +1048,9 @@ impl<T: ArrayElement> GodotType for Array<T> {
     type Ffi = Self;
 
     fn to_ffi(&self) -> Self::Ffi {
-        // `to_ffi` is sometimes intentionally called with an array in an invalid state.
-        self.clone()
+        // SAFETY: we may pass type-transmuted arrays to FFI (e.g. Array<T> as Array<Variant>). This would fail the regular
+        // type-check in clone(), so we disable it. Type invariants are upheld by the "front-end" APIs.
+        unsafe { self.clone_unchecked() }
     }
 
     fn into_ffi(self) -> Self::Ffi {

godot-core/src/meta/godot_convert/impls.rs

@@ -101,10 +101,6 @@ where
         self.as_ref().map(ToGodot::to_godot)
     }
 
-    fn into_godot(self) -> Self::Via {
-        self.map(ToGodot::into_godot)
-    }
-
     fn to_variant(&self) -> Variant {
         match self {
             Some(inner) => inner.to_variant(),

godot-core/src/meta/godot_convert/mod.rs

@@ -47,14 +47,6 @@ pub trait ToGodot: Sized + GodotConvert {
     /// Converts this type to the Godot type by reference, usually by cloning.
     fn to_godot(&self) -> Self::ToVia<'_>;
 
-    /// Converts this type to the Godot type.
-    ///
-    /// This can in some cases enable minor optimizations, such as avoiding reference counting operations.
-    fn into_godot(self) -> Self::Via {
-        //self.to_godot()
-        todo!()
-    }
-
     /// Converts this type to a [Variant].
     fn to_variant(&self) -> Variant {
         self.to_godot().to_ffi().ffi_to_variant()
@@ -103,8 +95,22 @@ pub trait FromGodot: Sized + GodotConvert {
     }
 }
 
-pub(crate) fn into_ffi<T: ToGodot>(value: T) -> <T::Via as GodotType>::Ffi {
-    value.into_godot().into_ffi()
+// pub(crate) fn into_ffi<'v, T: ToGodot >(value: T) -> <T::ToVia<'v> as GodotType>::Ffi {
+//     let by_ref = value.to_godot();
+//     let ffi = by_ref.to_ffi();
+//
+//     ffi
+// }
+
+pub(crate) fn into_ffi<'v, T: ToGodot>(value: &'v T) -> <T::ToVia<'v> as GodotType>::Ffi {
+    let by_ref = value.to_godot();
+    let ffi = by_ref.to_ffi();
+
+    ffi
+}
+
+pub(crate) fn into_ffi_variant<T: ToGodot>(value: &T) -> Variant {
+    GodotFfiVariant::ffi_to_variant(&into_ffi(value))
 }
 
 pub(crate) fn try_from_ffi<T: FromGodot>(
@@ -128,11 +134,6 @@ macro_rules! impl_godot_as_self {
             fn to_godot(&self) -> Self::ToVia<'_> {
                 self.clone()
             }
-
-            #[inline]
-            fn into_godot(self) -> Self::Via {
-                self
-            }
         }
 
         impl $crate::meta::FromGodot for $T {

godot-core/src/meta/signature.rs

@@ -14,7 +14,7 @@ use sys::{BuiltinMethodBind, ClassMethodBind, GodotFfi, UtilityFunctionBind};
 
 use crate::builtin::Variant;
 use crate::meta::error::{CallError, ConvertError};
-use crate::meta::godot_convert::{into_ffi, try_from_ffi};
+use crate::meta::godot_convert::{into_ffi, into_ffi_variant, try_from_ffi};
 use crate::meta::*;
 use crate::obj::{GodotClass, InstanceId};
 
@@ -225,7 +225,7 @@ macro_rules! impl_varcall_signature_for_tuple {
 
                 let explicit_args = [
                     $(
-                        GodotFfiVariant::ffi_to_variant(&into_ffi($pn)),
+                       into_ffi_variant(&$pn),
                     )*
                 ];
 
@@ -270,7 +270,7 @@ macro_rules! impl_varcall_signature_for_tuple {
                 let object_call_script_method = sys::interface_fn!(object_call_script_method);
                 let explicit_args = [
                     $(
-                        GodotFfiVariant::ffi_to_variant(&into_ffi($pn)),
+                        into_ffi_variant(&$pn),
                     )*
                 ];
 
@@ -305,7 +305,7 @@ macro_rules! impl_varcall_signature_for_tuple {
 
                 let explicit_args: [Variant; $PARAM_COUNT] = [
                     $(
-                        GodotFfiVariant::ffi_to_variant(&into_ffi($pn)),
+                       into_ffi_variant(&$pn),
                     )*
                 ];
 
@@ -392,7 +392,7 @@ macro_rules! impl_ptrcall_signature_for_tuple {
                 #[allow(clippy::let_unit_value)]
                 let marshalled_args = (
                     $(
-                        into_ffi($pn),
+                        into_ffi(&$pn),
                     )*
                 );
 
@@ -423,7 +423,7 @@ macro_rules! impl_ptrcall_signature_for_tuple {
                 #[allow(clippy::let_unit_value)]
                 let marshalled_args = (
                     $(
-                        into_ffi($pn),
+                        into_ffi(&$pn),
                     )*
                 );
 
@@ -451,7 +451,7 @@ macro_rules! impl_ptrcall_signature_for_tuple {
                 #[allow(clippy::let_unit_value)]
                 let marshalled_args = (
                     $(
-                        into_ffi($pn),
+                        into_ffi(&$pn),
                     )*
                 );
 
@@ -548,7 +548,9 @@ unsafe fn ptrcall_return<R: ToGodot>(
     _call_ctx: &CallContext,
     call_type: sys::PtrcallType,
 ) {
-    let val = into_ffi(ret_val);
+    //let val = into_ffi(ret_val);
+    let val = ret_val.to_godot().to_ffi();
+
     val.move_return_ptr(ret, call_type);
 }
 

godot-core/src/meta/traits.rs

@@ -42,7 +42,7 @@ pub trait GodotType: GodotConvert<Via = Self> + sealed::Sealed + Sized + 'static
 // 'static is not technically required, but it simplifies a few things (limits e.g. ObjectArg).
 {
     #[doc(hidden)]
-    type Ffi: GodotFfiVariant;
+    type Ffi: GodotFfiVariant + 'static;
 
     #[doc(hidden)]
     fn to_ffi(&self) -> Self::Ffi;

godot-core/src/obj/gd.rs

@@ -682,11 +682,6 @@ impl<T: GodotClass> ToGodot for Gd<T> {
         self.raw.check_rtti("to_godot");
         self.clone()
     }
-
-    fn into_godot(self) -> Self::Via {
-        self.raw.check_rtti("into_godot");
-        self
-    }
 }
 
 impl<T: GodotClass> FromGodot for Gd<T> {

godot-core/src/obj/object_arg.rs

@@ -259,10 +259,6 @@ impl<T: GodotClass> ToGodot for ObjectArg<T> {
     fn to_godot(&self) -> Self::ToVia<'_> {
         (*self).clone()
     }
-
-    fn into_godot(self) -> Self::Via {
-        self
-    }
 }
 
 // TODO refactor signature tuples into separate in+out traits, so FromGodot is no longer needed.

godot-core/src/obj/raw_gd.rs

@@ -541,10 +541,6 @@ impl<T: GodotClass> ToGodot for RawGd<T> {
     fn to_godot(&self) -> Self::ToVia<'_> {
         self.clone()
     }
-
-    fn into_godot(self) -> Self::Via {
-        self
-    }
 }
 
 impl<T: GodotClass> FromGodot for RawGd<T> {

godot-macros/src/derive/derive_to_godot.rs

@@ -48,10 +48,6 @@ fn make_togodot_for_newtype_struct(name: &Ident, field: &NewtypeStruct) -> Token
             fn to_godot(&self) -> #via_type {
                 ::godot::meta::ToGodot::to_godot(&self.#field_name)
             }
-
-            fn into_godot(self) -> #via_type {
-                ::godot::meta::ToGodot::into_godot(self.#field_name)
-            }
         }
     }
 }