feat(quaternion): add C4Quaternion

tempest/CMakeLists.txt

@@ -1,6 +1,7 @@
 file(GLOB TEMPEST_SOURCES
     "*.cpp"
     "matrix/*.cpp"
+    "quaternion/*.cpp"
     "rect/*.cpp"
     "vector/*.cpp"
 )

tempest/Quaternion.hpp

@@ -0,0 +1,6 @@
+#ifndef TEMPEST_QUATERNION_HPP
+#define TEMPEST_QUATERNION_HPP
+
+#include "tempest/quaternion/C4Quaternion.hpp"
+
+#endif

tempest/quaternion/C4Quaternion.cpp

@@ -0,0 +1,26 @@
+#include "tempest/quaternion/C4Quaternion.hpp"
+
+C4Quaternion C4Quaternion::Nlerp(float ratio, const C4Quaternion& q1, const C4Quaternion& q2) {
+    float x = (q2.x - q1.x) * ratio + q1.x;
+    float y = (q2.y - q1.y) * ratio + q1.y;
+    float z = (q2.z - q1.z) * ratio + q1.z;
+    float w = (q2.w - q1.w) * ratio + q1.w;
+
+    float m = x * x + y * y + z * z + w * w;
+    float v9 = ((m - 0.95906597) * -0.532516) + 1.021435;
+
+    if (m <= 0.91521198) {
+        v9 *= (((v9 * v9 * m) - 0.95906597) * -0.532516) + 1.021435;
+
+        if (m <= 0.6521197) {
+            v9 *= (((v9 * v9 * m) - 0.95906597) * -0.532516) + 1.021435;
+        }
+    }
+
+    x *= v9;
+    y *= v9;
+    z *= v9;
+    w *= v9;
+
+    return { x, y, z, w };
+}

tempest/quaternion/C4Quaternion.hpp

@@ -0,0 +1,24 @@
+#ifndef TEMPEST_QUATERNION_C_4QUATERNION_HPP
+#define TEMPEST_QUATERNION_C_4QUATERNION_HPP
+
+class C4Quaternion {
+    public:
+    // Static functions
+    static C4Quaternion Nlerp(float ratio, const C4Quaternion& q1, const C4Quaternion& q2);
+
+    // Member variables
+    float x = 0.0f;
+    float y = 0.0f;
+    float z = 0.0f;
+    float w = 1.0f;
+
+    // Member functions
+    C4Quaternion() = default;
+    C4Quaternion(float x, float y, float z, float w)
+        : x(x)
+        , y(y)
+        , z(z)
+        , w(w) {};
+};
+
+#endif