Black Artifacts on Android in OpenGL ES 2

Question

I have an OpenGL ES 2 code base that runs on iOS, Android, and on PC via the PowerVR emulation libraries.

When I run this code on an LG Optimus G LGE971, I see black art

Answer 1

I think maybe Lighting Calculation in shader code was wrong by mistake.

That looks like only using Ambient light without diffuse & specular.

also I want you to check whether you converted the texture from BGRA to RGBA.