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v3d,freedreno: Introduce a DRM shim for no-op on v3d andfreedreno, or calling out to the v3d simulator.

Emma Anholt requested to merge anholt/mesa:drm-shim into master

The goal is to enable testing of parts of drivers without depending on any particular kernel version or hardware being present.

Simply set LD_PRELOAD=$PREFIX/lib/ in your environment, and we'll fake a /dev/dri/renderD128 (or whatever the next available node is) using v3dv3. That node can then be used with the surfaceless or gbm EGL platforms.

Edited by Emma Anholt

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