Translation by Claudia Cotună, reviewed by Alexandru Băluț.

This reverts commit 6018b889. It
breaks several apps. To be revisited after 1.2.

Newer nvidia drivers return garbage when using a COUNTx where x is bigger
than the amount of coordinates the texture can consume. So stick to COUNT3 for
volume textures. The tests don't need COUNT4 anyway.

Translation by Claudia Cotună, reviewed by Alexandru Băluț.