AnimationTreePlayer: blend value tracks (closes #2299)

Variant:
- zero() sets a Variant to the appropriate type of zero value
- blend() blends part of one Variant on top of another.

1 files changed, 15 insertions, 0 deletions

diff --git a/core/variant.cpp b/core/variant.cpp
index 3bd8d80528..1fdbc9f753 100644
--- a/core/variant.cpp
+++ b/core/variant.cpp
@@ -1116,6 +1116,21 @@ void Variant::reference(const Variant& p_variant) {
 
 
 }
+void Variant::zero() {
+	switch(type) {
+		case NIL: break;
+		case BOOL: this->_data._bool = false; break;
+		case INT: this->_data._int = 0; break;
+		case REAL: this->_data._real = 0; break;
+		case VECTOR2: *reinterpret_cast<Vector2*>(this->_data._mem) = Vector2(); break;
+		case RECT2: *reinterpret_cast<Rect2*>(this->_data._mem) = Rect2(); break;
+		case VECTOR3: *reinterpret_cast<Vector3*>(this->_data._mem) = Vector3(); break;
+		case PLANE: *reinterpret_cast<Plane*>(this->_data._mem) = Plane(); break;
+		case QUAT: *reinterpret_cast<Quat*>(this->_data._mem) = Quat(); break;
+		case COLOR: *reinterpret_cast<Color*>(this->_data._mem) = Color(); break;
+		default: this->clear(); break;
+	}
+}
 void Variant::clear() {
 
 	switch(type) {