Radeon X1000 GPUs (R500) On Linux Finally Get HyperZ
Shortly after improving the HyperZ support in R300g, Marek Olšák has now enabled HyperZ support by default for ATI R500 (Radeon X1000 series) GPUs.
The R300/R400 GPUs don't yet have HyperZ support enabled by default until sufficient testing has been completed, but the HyperZ support can be toggled via the RADEON_HYPERZ environment variable. The newer Radeon GPUs with the R600g Gallium3D driver also don't yet have usable HyperZ support enabled by default. HyperZ is the ATI/AMD technology that's been around going back to the R100 GPU days for boosting the GPU performance and efficiency. HyperZ consists of Z compression for minimizing the Z-Buffer bandwidth, fast Z clear, and a hierarchical Z-Buffer.
In the Git commit enabling this feature, Marek describes the support as:
- Only one process can use it at a time. This is a hardware limitation.I did some HyperZ benchmarks months ago, but new R300g performance tests will now be coming up.
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