Did Microsoft Put Secret Sauce in Xbox One? DX12 May Allow Xbox One To Save GPU Time, Render Ray Tracing, SuperFog And Custom Effects

[Trunkin]

What are the DX12 features? Where's everybody reading that it's gonna be similar to Mantle? Have previous DX upgrades brought improved performance? Pretty much the only thing I know on this subject is that DX11 made tesselation and a few other effects possible.