Shader passes

[Azaratur]

I am trying to convert a project from Cocos Creator to Axmol, in that project I did create a shader with two render pass.
On first pass I did modify the verts and draw a shadow of my sprite, on the second pass I did apply normal and lights.

Is there a way to do the same on Axmol? How can I have a multiple pass shader?
Reading the documentation I saw "Please only write 1 uniform block per shader stage. Multi-uniform blocks are not implemented in the Metal backend."
What do you mean by shader stage?

[rh101]

Have a read of this post, and if it is related to what you're trying to achieve, then the updated demo code for Axmol can be found here:
https://github.com/rh101/PostEffectDemo

[Azaratur]

Will take a look to that, thank you.