Raspberry Pi Forums

This is the weirdest most annoying bug I've ever had, mainly because the pi will freeze and be unable to create a new context until it unfreezes (approx 2 minutes). I've narrowed it down to a single line of code with testing over a span of a few days.

It's my fragment shader eyes.frag that's doing it and the single line of code is this:




This definitely seems like a driver problem. I was wondering if anyone had any suggestions. My project is also linked here if anyone wants to try it. https://www.dropbox.com/s/u8xfxuzhdkj5e9o/eyes.zip?dl=0

Seems it can happen in some android too?

https://stackoverflow.com/questions/437 ... pp-freezes

"I experienced the same issue. The Nexus 7 (2013) was freezing when I called gllinkprogram(). I found that this only happened when I had 'if statements' in my shader. I was able to change both of my 'if statements' into 'conditional operators' and it worked.

E.g. (cond)? cond1:cond2"


Unfortunately this solution won't work for my shader.

Thanks to popcornmix, we found that the if statement dependence was due to optimization in the shader, and the reason for the hanging was a for-loop in the shader which doesn't work nicely with the pi's legacy driver i.e. the shader is too complex. More details https://github.com/raspberrypi/userland/issues/468

I might try the new beta driver, but first I'm going to try making the shader simpler.