Add support for Transform2D/3D in lerp()

Implements godotengine/godot-proposals#10579

1 files changed, 9 insertions, 1 deletions

diff --git a/core/variant/variant_utility.cpp b/core/variant/variant_utility.cpp
index 7534a154a1..384fe6c4a6 100644
--- a/core/variant/variant_utility.cpp
+++ b/core/variant/variant_utility.cpp
@@ -452,12 +452,14 @@ Variant VariantUtilityFunctions::lerp(const Variant &from, const Variant &to, do
 		case Variant::QUATERNION:
 		case Variant::BASIS:
 		case Variant::COLOR:
+		case Variant::TRANSFORM2D:
+		case Variant::TRANSFORM3D:
 			break;
 		default:
 			r_error.error = Callable::CallError::CALL_ERROR_INVALID_ARGUMENT;
 			r_error.argument = 0;
 			r_error.expected = Variant::NIL;
-			return R"(Argument "from" must be "int", "float", "Vector2", "Vector3", "Vector4", "Quaternion", "Basis, or "Color".)";
+			return R"(Argument "from" must be "int", "float", "Vector2", "Vector3", "Vector4", "Color", "Quaternion", "Basis", "Transform2D", or "Transform3D".)";
 	}
 
 	if (from.get_type() != to.get_type()) {
@@ -490,6 +492,12 @@ Variant VariantUtilityFunctions::lerp(const Variant &from, const Variant &to, do
 		case Variant::BASIS: {
 			return VariantInternalAccessor<Basis>::get(&from).slerp(VariantInternalAccessor<Basis>::get(&to), weight);
 		} break;
+		case Variant::TRANSFORM2D: {
+			return VariantInternalAccessor<Transform2D>::get(&from).interpolate_with(VariantInternalAccessor<Transform2D>::get(&to), weight);
+		} break;
+		case Variant::TRANSFORM3D: {
+			return VariantInternalAccessor<Transform3D>::get(&from).interpolate_with(VariantInternalAccessor<Transform3D>::get(&to), weight);
+		} break;
 		case Variant::COLOR: {
 			return VariantInternalAccessor<Color>::get(&from).lerp(VariantInternalAccessor<Color>::get(&to), weight);
 		} break;