Shaders: Lighting uniforms

[Rastar]

So I continue with my shader questions... ;-)

 

It seems the lightcolor uniform only contains values if lightposition has been used at least once. So if I return

 

gl_FragColor = lightcolor[0];

 

from the fragment shader it is empty if I didnt't call the position before, but if I insert

 

lightposition[1];

 

somewhere before (doesn't even have to index the same light) it works fine.

 

Is there any reason for that?

[Admin]

The engine checks for the lightposition uniform and skips all the lighting values if it isn't present.