[3/5] wined3d: Make the offscreen render mode a registry setting

[H. Verbeet]

On 17/11/06, Ivan Gyurdiev <ivg231 at gmail.com> wrote:
> No, you're adding code all over the place that looks up this setting -
> this will have to be changed later. It's the exact same thing I did with
> shader mode, so just trying to shortcut to the end result...
>
My plan is to remove the checks for both this and the shader code
completely, and switch to a more driver like structure, where we
simply load the correct backend at initialisation, and call stuff
through there.