diff --git a/include/d3dx8math.h b/include/d3dx8math.h
index 383c80c78f5..fa7eee69111 100644
--- a/include/d3dx8math.h
+++ b/include/d3dx8math.h
@@ -96,6 +96,32 @@ typedef struct _D3DVECTOR D3DXVECTOR3, *LPD3DXVECTOR3;
 
 typedef struct D3DXVECTOR4
 {
+#ifdef __cplusplus
+    D3DXVECTOR4();
+    D3DXVECTOR4(CONST FLOAT *pf);
+    D3DXVECTOR4(FLOAT fx, FLOAT fy, FLOAT fz, FLOAT fw);
+
+    operator FLOAT* ();
+    operator CONST FLOAT* () const;
+
+    D3DXVECTOR4& operator += (CONST D3DXVECTOR4&);
+    D3DXVECTOR4& operator -= (CONST D3DXVECTOR4&);
+    D3DXVECTOR4& operator *= (FLOAT);
+    D3DXVECTOR4& operator /= (FLOAT);
+
+    D3DXVECTOR4 operator + () const;
+    D3DXVECTOR4 operator - () const;
+
+    D3DXVECTOR4 operator + (CONST D3DXVECTOR4&) const;
+    D3DXVECTOR4 operator - (CONST D3DXVECTOR4&) const;
+    D3DXVECTOR4 operator * (FLOAT) const;
+    D3DXVECTOR4 operator / (FLOAT) const;
+
+    friend D3DXVECTOR4 operator * (FLOAT, CONST D3DXVECTOR4&);
+
+    BOOL operator == (CONST D3DXVECTOR4&) const;
+    BOOL operator != (CONST D3DXVECTOR4&) const;
+#endif /* __cplusplus */
     FLOAT x, y, z, w;
 } D3DXVECTOR4, *LPD3DXVECTOR4;
 
diff --git a/include/d3dx8math.inl b/include/d3dx8math.inl
index a2fd130e096..c034eba5e32 100644
--- a/include/d3dx8math.inl
+++ b/include/d3dx8math.inl
@@ -236,6 +236,118 @@ inline BOOL D3DXVECTOR3::operator != (CONST D3DXVECTOR3& v) const
     return x != v.x || y != v.y || z != v.z;
 }
 
+inline D3DXVECTOR4::D3DXVECTOR4()
+{
+}
+
+inline D3DXVECTOR4::D3DXVECTOR4(CONST FLOAT *pf)
+{
+    if(!pf) return;
+    x = pf[0];
+    y = pf[1];
+    z = pf[2];
+    w = pf[3];
+}
+
+inline D3DXVECTOR4::D3DXVECTOR4(FLOAT fx, FLOAT fy, FLOAT fz, FLOAT fw)
+{
+    x = fx;
+    y = fy;
+    z = fz;
+    w = fw;
+}
+
+inline D3DXVECTOR4::operator FLOAT* ()
+{
+    return (FLOAT*)&x;
+}
+
+inline D3DXVECTOR4::operator CONST FLOAT* () const
+{
+    return (CONST FLOAT*)&x;
+}
+
+inline D3DXVECTOR4& D3DXVECTOR4::operator += (CONST D3DXVECTOR4& v)
+{
+    x += v.x;
+    y += v.y;
+    z += v.z;
+    w += v.w;
+    return *this;
+}
+
+inline D3DXVECTOR4& D3DXVECTOR4::operator -= (CONST D3DXVECTOR4& v)
+{
+    x -= v.x;
+    y -= v.y;
+    z -= v.z;
+    w -= v.w;
+    return *this;
+}
+
+inline D3DXVECTOR4& D3DXVECTOR4::operator *= (FLOAT f)
+{
+    x *= f;
+    y *= f;
+    z *= f;
+    w *= f;
+    return *this;
+}
+
+inline D3DXVECTOR4& D3DXVECTOR4::operator /= (FLOAT f)
+{
+    x /= f;
+    y /= f;
+    z /= f;
+    w /= f;
+    return *this;
+}
+
+inline D3DXVECTOR4 D3DXVECTOR4::operator + () const
+{
+    return *this;
+}
+
+inline D3DXVECTOR4 D3DXVECTOR4::operator - () const
+{
+    return D3DXVECTOR4(-x, -y, -z, -w);
+}
+
+inline D3DXVECTOR4 D3DXVECTOR4::operator + (CONST D3DXVECTOR4& v) const
+{
+    return D3DXVECTOR4(x + v.x, y + v.y, z + v.z, w + v.w);
+}
+
+inline D3DXVECTOR4 D3DXVECTOR4::operator - (CONST D3DXVECTOR4& v) const
+{
+    return D3DXVECTOR4(x - v.x, y - v.y, z - v.z, w - v.w);
+}
+
+inline D3DXVECTOR4 D3DXVECTOR4::operator * (FLOAT f) const
+{
+    return D3DXVECTOR4(x * f, y * f, z * f, w * f);
+}
+
+inline D3DXVECTOR4 D3DXVECTOR4::operator / (FLOAT f) const
+{
+    return D3DXVECTOR4(x / f, y / f, z / f, w / f);
+}
+
+inline D3DXVECTOR4 operator * (FLOAT f, CONST D3DXVECTOR4& v)
+{
+    return D3DXVECTOR4(f * v.x, f * v.y, f * v.z, f * v.w);
+}
+
+inline BOOL D3DXVECTOR4::operator == (CONST D3DXVECTOR4& v) const
+{
+    return x == v.x && y == v.y && z == v.z && w == v.w;
+}
+
+inline BOOL D3DXVECTOR4::operator != (CONST D3DXVECTOR4& v) const
+{
+    return x != v.x || y != v.y || z != v.z || w != v.w;
+}
+
 #endif /* __cplusplus */
 
 /*_______________D3DXCOLOR_____________________*/