Performance-Boosting HyperZ Getting Fixed Up For Open-Source Radeon Linux Drivers

HyperZ support in the open-source Radeon Gallium3D drivers has been a bumpy road to say the least but it looks like some more improvements are imminent.

Since the start of HyperZ support in the open-source Radeon drivers in 2012 there have been many issues/workarounds to overcome, even going back to the ancient R300 Gallium3D driver, and issues have persisted through the R600g and RadeonSI drivers. Fortunately, there are a new round of improvements courtesy of Marek Olšák.

More about ATI/AMD HyperZ.

In new patches he posted today there is a new recommended setting from the hardware people for making Hyper-Z stable. The two magic states are supposed to fix Evergreen and Cayman GPUs as well as the more-modern SI/CI/VI GPUs.

With those fixes there, Marek goes ahead and re-enables Hyper-Z for stencil on Evergreen and Cayman GPUs in R600g and for all GCN GPUs via RadeonSI. Finally, he implements fast stencil clear support for the RadeonSI driver.