[Mesa-dev] [PATCH] mesa: fix the compressed TexSubImage size checking code

[Eric Anholt]

Brian Paul <brianp at vmware.com> writes:

> Before, we'd incorrectly generate an error if we we tried to
> replace a non-4x4 block near the edge of a NPOT compressed texture.
> For example, if the dest image was 15 texels wide and xoffset=12
> and width=3 we'd incorrectly generate GL_INVALID_OPERATION.
>
> Verified with new tests added to piglit s3tc-errors test.

Reviewed-by: Eric Anholt <eric at anholt.net>
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