function destroyFramebuffers(autoexposure) {
  const framebuffers = autoexposure._framebuffers;
  if (!defined(framebuffers)) {
    return;
  }

  const length = framebuffers.length;
  for (let i = 0; i < length; ++i) {
    framebuffers[i].destroy();
  }
  autoexposure._framebuffers = undefined;

  autoexposure._previousLuminance.destroy();
  autoexposure._previousLuminance = undefined;
}
A reference to the texture written to when executing this post process stage.

@memberof AutoExposure.prototype
@type {Texture}
@readonly
@private