http://bugs.freedesktop.org/show_bug.cgi?id=13395





------- Comment #3 from [EMAIL PROTECTED]  2007-11-27 11:02 PST -------
(In reply to comment #2)

> I wonder why this limitation is not explicilty stated in the OGL
> glTexSubImage2D() definition.

Because it's not part of core OpenGL.  It is a requirement added by an
extension.  It is documented in the specification for the relevant extensions. 
See:

http://www.opengl.org/registry/specs/EXT/texture_compression_s3tc.txt

    "CompressedTexSubImage2D will result
    in an INVALID_OPERATION error only if one of the following conditions
    occurs:

        * <width> is not a multiple of four or equal to TEXTURE_WIDTH.
        * <height> is not a multiple of four or equal to TEXTURE_HEIGHT.
        * <xoffset> or <yoffset> is not a multiple of four."


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