math: Implement MathCalcCommon::isNan and vectorx::isNan

include/math/seadMathCalcCommon.hpp

@@ -528,6 +528,12 @@ inline T MathCalcCommon<T>::clamp(T value, T low, T high)
     return value;
 }
 
+template <typename T>
+inline bool MathCalcCommon<T>::isNan(T value)
+{
+    return std::isnan(value);
+}
+
 template <typename T>
 inline bool MathCalcCommon<T>::chase(T* value, T target, T step)
 {

include/math/seadVector.h

@@ -69,6 +69,7 @@ struct Vector2 : public Policies<T>::Vec2Base
     T normalize();
 
     bool isZero() const { return *this == zero; }
+    bool isNan() const { return sead::Mathf::isNan(this->x) || sead::Mathf::isNan(this->y); }
 
     static const Vector2 zero;
     static const Vector2 ex;
@@ -190,6 +191,12 @@ struct Vector3 : public Policies<T>::Vec3Base
     void setRotated(const Quat& q, const Vector3& a);
     void setSub(const Vector3& a, const Vector3& b);
 
+    bool isNan() const
+    {
+        return sead::Mathf::isNan(this->x) || sead::Mathf::isNan(this->y) ||
+               sead::Mathf::isNan(this->z);
+    }
+
     static const Vector3 zero;
     static const Vector3 ex;
     static const Vector3 ey;
@@ -244,6 +251,12 @@ struct Vector4 : public Policies<T>::Vec4Base
     void set(const Vector4& v);
     void set(T x_, T y_, T z_, T w_);
 
+    bool isNan() const
+    {
+        return sead::Mathf::isNan(this->x) || sead::Mathf::isNan(this->y) ||
+               sead::Mathf::isNan(this->z) || sead::Mathf::isNan(this->w);
+    }
+
     static const Vector4 zero;
     static const Vector4 ex;
     static const Vector4 ey;