OpenGL4.x不支持gluPerspective函数。故备份之

template <typename type>

inline mat4<type> mat4<type>::perspectiveProjection(type fovy, type aspect, type zNear, type zFar)

{

    type f = (type)  / tan(radians(fovy) / );

    return mat4<type>(f / aspect, , ,                         ,

                      ,        f, ,                         ,

                      ,        , (zFar + zNear) / (zNear - zFar), (*zFar*zNear) / (zNear - zFar),

                      ,        , -,                        );

}

template <typename type>

inline mat4<type> mat4<type>::orthoProjection(type xRight, type xLeft, type yTop, type yBottom, type zNear, type zFar)

{

    type tx, ty, tz;

    tx = - (xRight + xLeft) / (xRight - xLeft);

    ty = - (yTop + yBottom) / (yTop - yBottom);

    tz = - (zFar + zNear) / (zFar - zNear);

    return mat4<type>( / (xRight - xLeft), ,                  ,                tx,

                       ,                   / (yTop - yBottom), ,                ty,

                       ,                  ,                 - / (zFar - zNear), tz,

                       ,                  ,                  ,                );

}