Implement Animation Compression

Roughly based on https://github.com/godotengine/godot-proposals/issues/3375 (used format is slightly different).

* Implement bitwidth based animation compression (see animation.h for format).
* Can compress imported animations up to 10 times.
* Compression format opens the door to streaming.
* Works transparently (happens all inside animation.h)

1 files changed, 9 insertions, 0 deletions

diff --git a/core/math/quaternion.cpp b/core/math/quaternion.cpp
index 3f1d2c58e5..a29a70c1f0 100644
--- a/core/math/quaternion.cpp
+++ b/core/math/quaternion.cpp
@@ -189,6 +189,15 @@ Quaternion::operator String() const {
 	return "(" + String::num_real(x, false) + ", " + String::num_real(y, false) + ", " + String::num_real(z, false) + ", " + String::num_real(w, false) + ")";
 }
 
+Vector3 Quaternion::get_axis() const {
+	real_t r = ((real_t)1) / Math::sqrt(1 - w * w);
+	return Vector3(x * r, y * r, z * r);
+}
+
+float Quaternion::get_angle() const {
+	return 2 * Math::acos(w);
+}
+
 Quaternion::Quaternion(const Vector3 &p_axis, real_t p_angle) {
 #ifdef MATH_CHECKS
 	ERR_FAIL_COND_MSG(!p_axis.is_normalized(), "The axis Vector3 must be normalized.");