Filtering - bolrog/d2dx GitHub Wiki

In fullscreen mode, or when using a window scale factor > 1, D2DX has to scale the game graphics to fit the screen. This can be done in different ways, described here.

The default (high quality, sharp) setting is chosen to give a pleasant experience without undue blurring or aliasing artifacts. If you're not a fan of seeing "pixels", other options are available.

Default (high quality, sharp)

filtering=0 This mode uses integer scaling to achieve a sharp result, or "antialiased nearest neighbor" filtering when an integer scale factor can't be used.

Bilinear

filtering=1 This mode uses a four-tap bilinear filter for a smoother result, at the price of overall blurriness.

Catmull-Rom bicubic

filtering=2 This mode uses a clever nine-tap bicubic filter for a smooth, but sharper than bilinear, result.