//定义几个常见的颜色值，方便在程序中使用
const XMVECTORF32 White = {1.0f, 1.0f, 1.0f, 1.0f};
const XMVECTORF32 Black = {0.0f, 0.0f, 0.0f, 1.0f};
const XMVECTORF32 Red = {1.0f, 0.0f, 0.0f, 1.0f};
const XMVECTORF32 Green = {0.0f, 1.0f, 0.0f, 1.0f};
const XMVECTORF32 Blue = {0.0f, 0.0f, 1.0f, 1.0f};
const XMVECTORF32 Yellow = {1.0f, 1.0f, 0.0f, 1.0f};
const XMVECTORF32 Cyan = {0.0f, 1.0f, 1.0f, 1.0f};
const XMVECTORF32 Magenta = {1.0f, 0.0f, 1.0f, 1.0f};
const XMVECTORF32 Silver = {0.75f,0.75f,0.75f,1.0f};