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.org

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 Linux Hardware Reviews
  1. ASRock X99 Extreme3 Is An Affordable Choice For Linux Users
  2. A Walkthrough Of The New 32 System Open-Source Linux Benchmarking Test Farm
  3. Habey MITX-6771: Mini-ITX Board With Quad-Core J1900 Bay Trail
  4. OCZ Vector 150 SSD On Linux
Latest Linux Articles
  1. 17-Way Linux Graphics Card Comparison With Civilization Beyond Earth
  2. AMD Kaveri: Open-Source Radeon Gallium3D vs. Catalyst 14.12 Omega Driver
  3. 12-Way AMD Catalyst 14.12 vs. NVIDIA 346 Series Linux GPU Comparison
  4. AMD Catalyst 14.12 Omega Driver Brings Mixed Results For Linux Users
Latest Linux News
  1. Heterogeneous Memory Management Is Coming Along For The Linux Kernel
  2. NTP Is The Latest Project Struck By Security Issues
  3. LDC 0.15.1 Released For A D Compiler In LLVM
  4. Fedora Doesn't Yet Enable F2FS File-System Support
  5. XZ 5.2 Adds New Multi-Threaded Options
  6. Intel 2.99.917 X.Org Driver Released, 3.0 Release Finally Near
  7. Server-Side XCB Is Being Discussed For The X.Org Server
  8. Adreno A4xx Rendering With Freedreno Takes Shape
  9. Linux 3.19-rc1 Kernel Released Ahead Of Schedule
  10. X.Org Server 1.16.3 Released To Fix Security Issues
Latest Forum Discussions
  1. Need some hand holding with upgrading xserver
  2. Maker3D - create your 3D RPG
  3. FPS capped on Linux (AMD fglrx drivers)
  4. Looking for an nVidia GPU, but not sure how well they are supported.
  5. Speeding up systemd networking service
  6. Major Performance Breakthrough Discovered For Intel's Mesa Driver
  7. Are there an app using HSA ?
  8. The New SuperTuxKart Looks Better, But Can Cause GPU/Driver Problems