rem: TFB_BBox_Reset ()
add: TFB_BBox_Reset (void)
context: TFB_BBox_Reset (){	TFB_BBox.valid = 0;	TFB_BBox.clip.corner.x = 0;	TFB_BBox.clip.corner.y = 0;	TFB_BBox.clip.extent.width = ScreenWidth;	TFB_BBox.clip.extent.height = ScreenHeight;}