New terrain system - please test!

Hi, I have a mobile (laptop) with the card AMD Radeon HD 7470M, issues a warning.

:pnmimage:png(warning): iCCP: known incorrect sRGB profile
Vertex shader was successfully compiled to run on hardware.
Fragment shader was successfully compiled to run on hardware.
:display:gsg:glgsg(warning): Shader skybox.frag.glsl produced the following warn
ings:
Vertex shader(s) linked, fragment shader(s) linked.

Vertex shader was successfully compiled to run on hardware.
Fragment shader was successfully compiled to run on hardware.
:display:gsg:glgsg(warning): Shader terrain.frag.glsl produced the following war
nings:
Vertex shader(s) linked, fragment shader(s) linked.