AMD Might Cancel Implicit Primitive Shader Driver Support

It's unconfirmed for now, but it looks like AMD might have canceled Implicit Primitive Shader Support on driver level. Shortly after CES2018, AMD apparently told this to some people in a breakout session, that they canceled the implicit driver path for Primitive Shaders, they are now offering only explicit control to developers who wish to implement it. 

So the new shader stage called Primitive Shaders will only be ever implemented if a developer properly codes for it. The driver portion has been canceled, according to the rumors. AMD have mentioned a while ago that primitive shaders aren't turned on for RX Vega, and no date was given for when they would be. With VEGA AMD announced a fully programmable geometry pipeline, which is new and has been added to the architecture. The shader stage runs in place of the usual vertex and geometry shader path, the primitive shader allows for the fast removal of hidden and or unnecessary primitives. 

Game developers can still access the ability implement primitive shaders on AMD hardware like Vega, with the help of a to be released explicit API path. But simply not at a driver level. Apparently, AMD didn't explain any reasoning behind the cancelation.

Source -  Marc Sauter (y33H@), editor at the German IT site Golem.de