Replaced the Image::generateMipmap switch statements with function calls to get the mip generation function. TRAC #22972 Signed-off-by: Jamie Madill Signed-off-by: Nicolas Capens Author: Geoff Lang git-svn-id: https://angleproject.googlecode.com/svn/branches/es3proto@2319 736b8ea6-26fd-11df-bfd4-992fa37f6226