glTexImage3D(target, level, ifmt, width, height, depth, border, fmt, type, data);
}
void Texture3D::load_image(const string &fn, int dp)
{
glTexImage3D(target, level, ifmt, width, height, depth, border, fmt, type, data);
}
void Texture3D::load_image(const string &fn, int dp)
{