Re: [PATCH v2 0/1] MR2299: wined3d: Do not switch pixel format on non-private GL contexts.

[Henri Verbeet (＠hverbeet)]

> Otherwise, it can be technically made to work like for GL child window redering (keeping composite redirected drawables for different pixel formats) but that requires essentially the same blitting on each present as done with wined3d backup context.

It wouldn't need to go through CPU memory though.