dri: Do not create DRI2 buffers for unrecognized DRI2 buffer tokens

Before this commit, if a client were to request an unrecognized DRI2
buffer, such as DRI2BufferStencil, then I830DRI2CreateBuffer() allocated
and returned an X-tiled buffer by accident. The problem was that
unrecognized tokens were caught by the default case of a switch statement.

Now, when given unrecognized DRI2 tokens, I830DRI2CreateBuffers() returns
null.

This shouldn't break older Mesa versions, because they never query (via
DRI2GetBuffersWithFormat) for the drawable's DRI2BufferStencil.

CC: Eric Anholt <eric@anholt.net>
CC: Ian Romanick <idr@freedesktop.org>
CC: Kenneth Graunke <kenneth@whitecape.org>
CC: Kristian Høgsberg <krh@bitplanet.net
Signed-off-by: Chad Versace <chad@chad-versace.us>
(cherry picked from commit 263daba7e6afb37bd471fdc8dd8e4458da0a45ff)

Signed-off-by: Owain G. Ainsworth <oga@openbsd.org>

0 files changed, 0 insertions, 0 deletions