internal/pipewire: implement Registry::Destroy

This requires error handling infrastructure in Core that does not yet exist, so it is not exported for now. It has been manually tested via linkname against PipeWire.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/pipewire/core.go

@@ -608,6 +608,39 @@ func (registry *Registry) bind(proxy eventProxy, id, version Int) (Int, error) {
 	)
 }
 
+// RegistryDestroy is sent to try to destroy the global object with id.
+// This might fail when the client does not have permission.
+type RegistryDestroy struct {
+	// The global id to destroy.
+	ID Int `json:"id"`
+}
+
+// Opcode satisfies [Message] with a constant value.
+func (c *RegistryDestroy) Opcode() byte { return PW_REGISTRY_METHOD_DESTROY }
+
+// FileCount satisfies [Message] with a constant value.
+func (c *RegistryDestroy) FileCount() Int { return 0 }
+
+// Size satisfies [KnownSize] with a constant value.
+func (c *RegistryDestroy) Size() Word {
+	return SizePrefix +
+		Size(SizeInt)
+}
+
+// MarshalBinary satisfies [encoding.BinaryMarshaler] via [Marshal].
+func (c *RegistryDestroy) MarshalBinary() ([]byte, error) { return Marshal(c) }
+
+// UnmarshalBinary satisfies [encoding.BinaryUnmarshaler] via [Unmarshal].
+func (c *RegistryDestroy) UnmarshalBinary(data []byte) error { return Unmarshal(data, c) }
+
+// destroy queues a [RegistryDestroy] message for the PipeWire server.
+func (registry *Registry) destroy(id Int) error {
+	return registry.ctx.writeMessage(
+		registry.ID,
+		&RegistryDestroy{id},
+	)
+}
+
 // An UnsupportedObjectTypeError is the name of a type not known by the server [Registry].
 type UnsupportedObjectTypeError string