Only 8 sprite textures are supported

[lejar]

Since the whole UI is drawn in one call, there is a limit on the number of textures you can have at once. I needed to have a much higher limit, so I hacked in separate draw calls for each LUISprite object, which lets you have as many different sprites with different textures as you want.

This was done by passing a vector down into render_recursive, and letting each object decide whether or not they want to put in a geometry and shader attribute object. This way, only the LUISprites get an extra draw call.

@tobspr If you think something like this is okay, I can clean it up and hide the functionality behind a define, then make a pull request. My commit is 264434d

[tobspr]

Hey!

I would be fine if would be behind a define and documented, so its available in case you need it.
Do you, by any chance, had the possibility to measure the performance loss? Is it actually much slower?

[lejar]

There definitely is a performance loss, but I don't know if I'd call it a large one. I made a test with 200 LUIButtons, plus a variable number of LUISprites. I unlocked the frame rate and took some measurements with each number of LUISprites, then calculated the frame time from the fps and plotted it.

Github wouldn't upload my graph, so I had to put it here.