【D3D11游戏编程】XNAMath XMVECTOR

/* #include <windows.h> // for FLOAT definition #include <xnamath.h> #include <iostream> using namespace std; // Overload the "<<" operators so that we can use cout to // output XMVECTOR objects. ostream& operator<<(ostream& os, FXMVECTOR v) { XMFLOAT3 dest; XMStoreFloat3(&dest, v); os << "(" << dest.x << ", " << dest.y << ", " << dest.z << ")"; return os; } int main() { cout.setf(ios_base::boolalpha); // Check support for SSE2 (Pentium4, AMD K8, and above). if( !XMVerifyCPUSupport() ) { cout << "xna math not supported" << endl; return 0; } XMVECTOR n = XMVectorSet(1.0f, 0.0f, 0.0f, 0.0f); XMVECTOR u = XMVectorSet(1.0f, 2.0f, 3.0f, 0.0f); XMVECTOR v = XMVectorSet(-2.0f, 1.0f, -3.0f, 0.0f); XMVECTOR w = XMVectorSet(0.707f, 0.707f, 0.0f, 0.0f); // Vector addition: XMVECTOR operator + XMVECTOR a = u + v; // Vector subtraction: XMVECTOR operator - XMVECTOR b = u - v; // Scalar multiplication: XMVECTOR operator * XMVECTOR c = 10.0f*u; // ||u|| XMVECTOR L = XMVector3Length(u); // d = u / ||u|| XMVECTOR d = XMVector3Normalize(u); // s = u dot v XMVECTOR s = XMVector3Dot(u, v); // e = u x v XMVECTOR e = XMVector3Cross(u, v); // Find proj_n(w) and perp_n(w) XMVECTOR projW; XMVECTOR perpW; XMVector3ComponentsFromNormal(&projW, &perpW, w, n); // Does projW + perpW == w? bool equal = XMVector3Equal(projW + perpW, w) != 0; bool notEqual = XMVector3NotEqual(projW + perpW, w) != 0; // The angle between projW and perpW should be 90 degrees. XMVECTOR angleVec = XMVector3AngleBetweenVectors(projW, perpW); float angleRadians = XMVectorGetX(angleVec); float angleDegrees = XMConvertToDegrees(angleRadians); cout << "u = " << u << endl; cout << "v = " << v << endl; cout << "w = " << w << endl; cout << "n = " << n << endl; cout << "a = u + v = " << a << endl; cout << "b = u - v = " << b << endl; cout << "c = 10 * u = " << c << endl; cout << "d = u / ||u|| = " << d << endl; cout << "e = u x v = " << e << endl; cout << "L = ||u|| = " << L << endl; cout << "s = u.v = " << s << endl; cout << "projW = " << projW << endl; cout << "perpW = " << perpW << endl; cout << "projW + perpW == w = " << equal << endl; cout << "projW + perpW != w = " << notEqual << endl; cout << "angle = " << angleDegrees << endl; return 0; }*/