"filter" option was ignored. Simply added the argument
to the context function to fix the issue.

Change-Id: I108c4128bbc4f319091f082df96e056057f926fe
Reviewed-on: https://swiftshader-review.googlesource.com/7363Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>