Shader Fun With A Shaders N00B!

Hello guys!
Today, I felt burnt out from Java. So I tried my hand at some GLSL shaders! Here is a few!

Near-Death/Low-HP for FPS!
Sprinting/Gainin’ HP for FPS!
Cool Exploitation of Square Pixels Showing Circles!

Let me know what you think ;D!

Neat, although the second one should be toned down a little; Currently it’s more like a FPS poison layover, or at least IMO it is.

EDIT: Nvm, I just noticed there’s a dropdown box that seemingly controls the intensity factor, although I’m not sure what it’s for exactly.

Jesus christ my poor eyes

The second one crashed my phone!

Nice, but why are you using sin / cos?
It would be enough to do just:

col.r = 255;
col.a = distance(resolution/2.0, frg)time10.;

If you have a device running iOS there are quite a few apps out there, paid and free. I don’t know about Android however, as I’ve never had a device running an Android OS.

I have a Galaxy S3 running CM 10.2 and it runs alright!