opengl - GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT returns 0 -

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i'm testing library on other machines. unfortunately, anisotropic filtering causing problems.

on machine (nvidia geforce 580m gtx) works fine , expected.

on test machine however, it's failing because when querying gl_max_texture_max_anisotropy_ext, 0. unaware possible reading the spec.. it's (fairly) new laptop ati mobility radeon hd 4250 should support extension.

any ideas why gl_max_texture_max_anisotropy_ext return 0? thanks,


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