[quote:1yrtrg90]If you stretch the window, DirectX does an automatic stretch with linear filtering. That cannot be changed, DirectX doesn't support it (don't ask me why it's like that). The best thing to do is to make your window the true size in application properties, then zoom the display to 200%. With point sampling on, you should get everything double-sized, and nice and pixelly.
I'm thinking you could override OnSize and do a resolution switch to the nearest available res? Perhaps a runtime setting.