Callback upon each step.
See
Returns
stepState
null
props
Optional
The props passed to run.
run
The framebuffers for props.stepNow from props.steps, where the next state step will be drawn. See toData.
framebuffer
props.stepNow
props.steps
toData
Callback upon each step.
See
Returns
stepStateobject to use for each of the step's next passes; ornullish to use the givenprops.