This parameter, defaulting to #t, controls where textures are bound in the fast render functions. When unique-textures? is #t, textures are bound in the main render function. When unique-textures? is #f, textures are bound in the begin render function. In other words: when unique-textures? is #f, it is assumed that that all of the renderables belonging to the same pipeline share a common “sprite sheet” (or other shared texture type). This parameter must be set for syntax (i.e. in a begin-for-syntax form) in order to have an effect.