Testing Radeon HyperZ support in the R300g Gallium3D driver on some Radeon X1000 series hardware (Radeon X1800XT R520 and Radeon X1800XL) when toggling RADEON_HYPERZ environment variable for controlling the HyperZ support. Testing from near final Mesa 8.0 on Linux 3.2 kernel under Ubuntu 12.04. Performance testing for a future article on Phoronix.com by Michael Larabel.