Use Per Renderer Data in UI

Unity default UI shader use [PerRendererData] for Sprite Texture, so you can use one shader for all your sprite and render them in one draw call. But I can't seem to find a API call for setting those anywhere, so I decompile Unity dll just to find that they use an Internal call to set the sprite.

On the asset store I see a lot of package about normal mapped UI, so there must be a way to pass in per renderer data to the Canvas Renderer, right?

 

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Also struggling with this. The only solution I found so far is cloning the materials on runtime, which creates more drawcalls in the end.

Code (CSharp):

1. Material instancedMat;
2. ...
3. instancedMat = Instantiate(image.material);
4. image.material = instancedMat;

Also took a look at the decompiled unity version, but didn't get any smarter. I fear as for now (5.6), there is no solution to this problem.