Le 21 avr. 2014 13:16, "Rob Clark" <robdcl...@gmail.com> a écrit : > > On Sat, Apr 19, 2014 at 9:32 AM, Mohamed MEDIOUNI > <mohamedmedioun...@gmail.com> wrote: > > The VideoCore IV GPU has 14 cores: > > > > - 2 VPU Cores : Full-blown cores which run the ThreadX RTOS. > > There is an experimental LLVM port to it and also the VBCC C89 > > compiler(which has'nt time support so classic benchmarks run indefinitely). > > The binary blob run on that. > > 5 GFlops > > > > - 12 QPU Cores : 3D cores officially documented by Broadcom and using a > > tile-mode rendering architecture. > > The full Android driver for that was open-sourced at the end of February. > > > > 24Gflops > > > > Questions: > > > > Can Gallium3D run with tile-mode rendering architecture ? > > yes, adreno (freedreno) is a tiler > > > Is it better using Mesa and the Broadcom shader compiler ? > > Allegedly it may be easier to shoehorn in the blob compiler with a > mesa/dri driver vs mesa/gallium driver. That probably shouldn't be > too much of a concern in the long run. Overall I think a gallium > driver would be much easier to implement... gallium plus helpers > provide a lot to the driver writer. > > > Is it better using the VPU and an adapted LLVMpipe ? > > I guess you are talking about keeping the driver-on-videocore > approach? That may have some advantages when it comes to handling > security (lack of mmu) on r-pi. But other than that, I suspect > everything else will be easier to develop/debug on the arm side. And > I suspect avoiding round trips to the coprocessor will help > performance in a lot of cases. > > so if you can figure out a way to deal with security aspect with arm > side driver, then I'd go for arm side gallium driver as my first > choice. > Have now some problems including :
Need to run the programs as root or chmod 777 /dev/mem and chmod 777 /dev/vc-mem > BR, > -R > > > > > _______________________________________________ > > mesa-dev mailing list > > mesa-dev@lists.freedesktop.org > > http://lists.freedesktop.org/mailman/listinfo/mesa-dev > >
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