struct Sprite {    Sprite(const char *_path, float _tx=0, float _ty=0, float _tw=0, float _th=0) : path(_path), tx(_tx), ty(_ty), tw(_tw), th(_th) {    };    const char *path;    const float tx, ty;    float tw, th;};struct Rotate {    Rotate(float _a=0, float _cx=0, float _cy=0) : a(_a), cx(_cx), cy(_cy) {    };    float a;    float cx, cy;};namespace R {    void DrawSprite(Sprite *, float x, float y, float w, float h, const Rotate *r=NULL, float z=0);}