I'm working with a simple shader to render a texture to screen with a triangle fan and OpenGL ES 3. I noticed that centroid in/out is broken in the shaders.
I've got two images, one with centroid in/out enabled and one with regular in/out.
Don't let the texture fool you, it is a rendering from the CPU being output as a texture which I am using the draw to the screen.
This is with the Galaxy S4 with it's version 14 drivers again.