1 #ifndef ANDROID_DVR_ORTHO_H_ 2 #define ANDROID_DVR_ORTHO_H_ 3 4 #include <private/dvr/types.h> 5 6 namespace android { 7 namespace dvr { 8 9 template <class T> 10 Eigen::AffineMatrix<T, 4> OrthoMatrix(T left, T right, T bottom, T top, 11 T znear, T zfar) { 12 Eigen::AffineMatrix<T, 4> result; 13 const T t2 = static_cast<T>(2); 14 const T a = t2 / (right - left); 15 const T b = t2 / (top - bottom); 16 const T c = t2 / (zfar - znear); 17 const T xoff = -(right + left) / (right - left); 18 const T yoff = -(top + bottom) / (top - bottom); 19 const T zoff = -(zfar + znear) / (zfar - znear); 20 const T t1 = static_cast<T>(1); 21 result.matrix() << a, 0, 0, xoff, 22 0, b, 0, yoff, 23 0, 0, c, zoff, 24 0, 0, 0, t1; 25 return result; 26 } 27 28 } // namespace android 29 } // namespace dvr 30 31 #endif // ANDROID_DVR_ORTHO_H_ 32
