Rectangular texture mipmaps in opengl

[Beherith]

I read something in the orange book about openGL not supporting mipmapping for rectangular textures. Is this true for power of two rectangles as well? Because if it is, I think I know why my trees have some artifacts.

No bias or lod parameters for rectangular textures, multi-sample textures, or texture buffers are supported because mip-maps are not allowed for these types of textures.

http://www.opengl.org/registry/doc/GLSL ... .50.09.pdf page 98

[Kloot]

No, mipmapping is always possible for PO2 textures (square or rectangular).

Also, the ARB_texture_non_power_of_two extension supports mipmap generation for the non-PO2 case (unlike ARB_texture_rectangle).

[Beherith]

Ok, thanks!