Minimal changes to make PR mergeable before upstream virtual-compat is ready

Reduces the surface for merge conflicts. Either this commit can be individually
reverted later, or locations with TODO(v0.3,virtual-compat) can be sought out.

Author: Bromeon

godot-codegen/src/models/domain_mapping.rs

@@ -424,12 +424,15 @@ impl ClassMethod {
         let direction = FnDirection::Virtual {
             #[cfg(since_api = "4.4")]
             hash: {
-                let hash_i64 = method.hash.unwrap_or_else(|| {
+                // TODO(v0.3,virtual-compat): re-enable this in favor of 0 fallback.
+                /*let hash_i64 = method.hash.unwrap_or_else(|| {
                     panic!(
                         "virtual class methods must have a hash since Godot 4.4; missing: {}.{}",
                         class_name.godot_ty, method.name
                     )
-                });
+                });*/
+                // Temporarily use hash 0 until upstream PR is merged.
+                let hash_i64 = method.hash.unwrap_or(0);
 
                 // TODO see if we can use u32 everywhere.
                 hash_i64.try_into().unwrap_or_else(|_| {

godot-core/src/registry/callbacks.rs

@@ -113,12 +113,15 @@ pub unsafe extern "C" fn free<T: GodotClass>(
 pub unsafe extern "C" fn get_virtual<T: cap::ImplementsGodotVirtual>(
     _class_user_data: *mut std::ffi::c_void,
     name: sys::GDExtensionConstStringNamePtr,
-    hash: u32,
+    // TODO(v0.3,virtual-compat): re-enable parameter
+    //hash: u32,
 ) -> sys::GDExtensionClassCallVirtual {
     // This string is not ours, so we cannot call the destructor on it.
     let borrowed_string = StringName::borrow_string_sys(name);
     let method_name = borrowed_string.to_string();
 
+    // TODO(v0.3,virtual-compat): remove local var
+    let hash = 0;
     T::__virtual_call(method_name.as_str(), hash)
 }
 
@@ -130,20 +133,22 @@ pub unsafe extern "C" fn get_virtual<T: cap::ImplementsGodotVirtual>(
     // This string is not ours, so we cannot call the destructor on it.
     let borrowed_string = StringName::borrow_string_sys(name);
     let method_name = borrowed_string.to_string();
-
     T::__virtual_call(method_name.as_str())
 }
 
 #[cfg(since_api = "4.4")]
 pub unsafe extern "C" fn default_get_virtual<T: UserClass>(
     _class_user_data: *mut std::ffi::c_void,
     name: sys::GDExtensionConstStringNamePtr,
-    hash: u32,
+    // TODO(v0.3,virtual-compat): re-enable parameter
+    // hash: u32,
 ) -> sys::GDExtensionClassCallVirtual {
     // This string is not ours, so we cannot call the destructor on it.
     let borrowed_string = StringName::borrow_string_sys(name);
     let method_name = borrowed_string.to_string();
 
+    // TODO(v0.3,virtual-compat): remove local var
+    let hash = 0;
     T::__default_virtual_call(method_name.as_str(), hash)
 }
 

godot-core/src/registry/class.rs

@@ -86,8 +86,11 @@ type GodotCreationInfo = sys::GDExtensionClassCreationInfo4;
 
 #[cfg(before_api = "4.4")]
 pub(crate) type GodotGetVirtual = <sys::GDExtensionClassGetVirtual as sys::Inner>::FnPtr;
+// TODO(v0.3,virtual-compat): re-enable this to use GetVirtual2
+// #[cfg(since_api = "4.4")]
+// pub(crate) type GodotGetVirtual = <sys::GDExtensionClassGetVirtual2 as sys::Inner>::FnPtr;
 #[cfg(since_api = "4.4")]
-pub(crate) type GodotGetVirtual = <sys::GDExtensionClassGetVirtual2 as sys::Inner>::FnPtr;
+pub(crate) type GodotGetVirtual = <sys::GDExtensionClassGetVirtual as sys::Inner>::FnPtr;
 
 #[derive(Debug)]
 struct ClassRegistrationInfo {