1 files changed, 22 insertions, 0 deletions
diff --git a/include/egg/math/eggQuat.h b/include/egg/math/eggQuat.h
index a752b229..aa33b73b 100644
--- a/include/egg/math/eggQuat.h
+++ b/include/egg/math/eggQuat.h
@@ -44,10 +44,26 @@ struct Quatf {
     Vector3f rotateVector(const Vector3f &);
     Vector3f rotateVectorInv(const Vector3f &); // not in SS
     void slerpTo(const Quatf &, f32, Quatf &out) const;
+    void slerpTo2(f32 fparam, const Quatf &param1, Quatf &out) const {
+        const Quatf &tmp = param1;
+        slerpTo(tmp, fparam, out);
+    }
     void limitSlerpTo(const Quatf &, f32, f32, Quatf &out) const;
     void makeVectorRotationLimit(Vector3f &, Vector3f &, f32); // not in SS
     void makeVectorRotation(const Vector3f &, const Vector3f &);
 
+    // not sure about the name
+    f32 dot(const Quatf &other) const {
+        f32 ret = v.dot(other.v);
+        ret += w * other.w;
+        return ret;
+    }
+
+    void set(const Quatf &other) {
+        v.set(other.v);
+        w = other.w;
+    }
+
     void multScalar(f32 s) {
         w *= s;
         v.x *= s;
@@ -58,6 +74,12 @@ struct Quatf {
         set(1.0f, 0.0f, 0.0f, 0.0f);
     }
 
+    void makeWPositive() {
+        if (w < 0.f) {
+            multScalar(-1.f);
+        }
+    }
+
     Vector3f v;
     f32 w;
 };