_math_matrix_is_dirty() should only be used to decide if we need to
run _math_matrix_analyse(). We already decided that we had a new
texture matrix when we called _mesa_update_texture_matrices() so
we need to set _TexMatEnabled correctly otherwise we might
incorrectly return _NEW_FF_VERT_PROGRAM | _NEW_FF_FRAG_PROGRAM in
the following if-statement.
Fixes: ec978e002f ("mesa: only update fixed-func programs on texture matrix enablement changes")
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/14286
Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38473>
(cherry picked from commit b0047be0c2)
14a8d894d0