1. Computers
  2. Display Drivers
  3. Graphics Cards
  4. Memory
  5. Motherboards
  6. Processors
  7. Software
  8. Storage
  9. Operating Systems


Facebook RSS Twitter Twitter Google Plus


Phoronix Test Suite

OpenBenchmarking Benchmarking Platform
Phoromatic Test Orchestration

LLVMpipe & Compiz 0.9 Still Don't Play Along

Mesa

Published on 19 August 2010 12:35 PM EDT
Written by Michael Larabel in Mesa
6 Comments

LLVMpipe is an especially interesting Gallium3D driver since it allows accelerating the state trackers atop any modern CPU, but for any close to decent level of performance when using OpenGL you need a hefty multi-core CPU (here's some LLVMpipe benchmarks just from last week) that supports the latest SSE4 instructions as well. While some OpenGL games will run with LLVMpipe and the performance of this driver that leverages the Low-Level Virtual Machine is much faster and better than Mesa's old software rasterizer or the Gallium3D Softpipe driver, Compiz nor the GNOME Shell (and most other compositing window managers) yet work with this driver.

LLVMpipe fails with the GNOME Shell and Compiz 0.8 because the LLVM+Gallium3D driver doesn't yet implement the GLX_EXT_texture_from_pixmap extension, which is needed for these desktop compositing window managers. Attempting to use the current LLVMpipe driver with such compositing managers will either result in a black/white screen or other show-stopping artifacts.

Eventually the LLVMpipe driver should support the texture-from-pixmap extension and a number of weeks back an initial implementation of this GLX extension was added to Mesa's Software Rasterizer. This may become more important once GNOME 3.0 ships with the GNOME Shell / Mutter and more Linux desktop users expect a composited experience regardless of whether there is a proper graphics driver or not, but with using LLVMpipe it will cost you some CPU cycles.

As was pointed out in our forums, with Compiz 0.9 the GLX_EXT_texture_from_pixmap support is no longer a hard requirement for Compiz. While using the texture-from-pixmap extension is the most efficient path for an OpenGL window compositor, with Compiz 0.9 comes a "copy mode" plug-in (called "copytex") that is not quite as fast with its copying of pixmap content to texture approach. Besides dropping the hard requirement against the proper GLX extension, this method also allows pixmaps bigger than the maximum texture size supported by the driver/GPU. However, even still Compiz 0.9 still isn't playing along well with the latest Git code.

When trying out the very latest Git code for Compiz and Mesa/Gallium3D/LLVMpipe from last weekend, there is progress in that it longer a solid-colored screen that appears when launching Compiz. However, the window decorations are not rendered and the overall experience still isn't usable. At least though we are heading in the right direction and we'll be continuing in our LLVMpipe/Gallium3D experiments.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
Latest Articles & Reviews
  1. AMD Radeon R9 290 OpenGL On Ubuntu 15.04: Catalyst vs. RadeonSI Gallium3D
  2. Ubuntu 15.04 Offers Faster OpenGL For AMD Radeon GPUs On Open-Source
  3. Ubuntu 15.04 Brings Some Graphics Performance Improvements For Intel Haswell
  4. Sub-$20 802.11n USB WiFi Adapter That's Linux Friendly
  5. The Lenovo T450s Is Working Beautifully With Linux
  6. Linux 4.0 SSD EXT4 / Btrfs / XFS / F2FS Benchmarks
Latest Linux News
  1. Reasons To Make A PTS/OB Test Profile For Your Software
  2. Vivaldi TP3 Browser Adds Native Window Support On Linux
  3. A Brief Update On Fwupd For Linux Firmware Updating Of Devices
  4. Upgrading To KDE Plasma 5.3 On Kubuntu 15.04
  5. Ubuntu 15.10 Plans Being Discussed Next Week
  6. KDE Plasma 5.3 Released: Expands On Widgets, Bluetooth, PM
  7. Making It Easier To Deploy CUDA On Fedora
  8. GCC 4.9.2 vs. GCC 5 Benchmarks On An Intel Xeon Haswell
  9. Intel Haswell/Broadwell Power Use On Linux Still Moving Lower
  10. QEMU 2.3 Officially Released
Most Viewed News This Week
  1. Ubuntu's Desktop-Next Switching From .DEBs To Snappy
  2. Systemd Kills Off Shutdownd
  3. KDBUS Still Hasn't Been Pulled, Might Not Land For Linux 4.1
  4. My Favorite Computer Desk Of The Past Decade For Less Than $100
  5. AMD Open-Sources "Addrlib" From Catalyst
  6. Qt Creator 3.4 Brings C++ Programming Improvements & More
  7. Debian 8.0 Jessie Is Ready For Release This Weekend
  8. GIMP's Porting To GTK3 Continues