Terrain textures differs between ARB and GLSL

[fabio]

Originally reported by Dan39 on IRC, terrain textures differs when enabling GLSL. Reproduced on:

• NVidia GeForce 8800 GT / nouveau (Dan39);
• ATI Radeon X1600 / mesa (me);
• Intel HD3000 / mesa (me);
• Intel HD3000 / Wind7 (me);

so it's probably something in 0 A.D. and not in driver/OS. To me it seems that NO-GLSL behaviour is better (test yourself in-game and not only basing on the screenshots), no idea however if it's an issue or it's wanted by design.

GLSL:

NO-GLSL:

[wraitii]

This is probably because of trilinear texture sampling. Compare on Alpine Valleys: with GLSL it looks much better.

Maybe this particular texture shouldn't use trilinear sampling.