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

GLX TFP Now Works For LLVMpipe Driver

Google

Published on 25 October 2011 08:22 PM EDT
Written by Michael Larabel in Google
1 Comment

Thanks to Google's continued improvements to Gallium3D (namely the Intel Gallium3D driver and LLVMpipe), the GLX_EXT_texture_from_pixmap extension should finally be working correctly with the LLVMpipe driver. We may now finally see some compositing window managers working with this CPU-based software driver.

For those not up to speed:

GLX_EXT_texture_from_pixmap is a GLX extension that allows a color buffer to be used for both rendering and texturing, but namely is used for binding an X11 drawable to a texture. GLX_EXT_texture_from_pixmap is commonly required by compositing window managers (e.g. Compiz) for providing some level of desktop effects. For more details, read the OpenGL specification.

LLVMpipe is the software-based acceleration driver for the Gallium3D architecture that's used when no GPU hardware driver is available. LLVMpipe is much faster than Mesa's classic software rasterizer or the original Gallium3D-based software driver as it leverages LLVM for efficient shader generation and can take advantage of multiple CPU cores, SSE2/SSE3, and other modern CPU features.

LLVMpipe isn't fast enough to run most older (ioquake3 era) OpenGL games, even with today's very fast multi-core CPUs, but it might be enough to handle some basic desktop window effects now that there's finally GLX_EXT_texture_from_pixmap support. This could be if your graphics card has no hardware driver yet or if you're running in a virtualized environment where there might not be any hardware accelerated support.

Last month we saw Chrome/Chromium OS developers at Google working on software based support for the TFP extension. However, it didn't work for LLVMpipe. Thanks to a commit by St├ęphane Marchesin, it looks like it finally might. In a commit adding just over 100 lines of new code to the GLX state tracker, Marchesin implemented texture_from_pixmap support without DRI. The comment reads, "Makes texture_from_pixmap work with non-DRI llvmpipe."

The commit can be found in Mesa Git master and can be viewed on the web. It's yet another feature to be found in the next Mesa release, which will come as either version 7.12 or 8.0 (contingent on OpenGL 3.0 support being finished by year's end).

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. Preview: AMD's FX-9590 Eight-Core At Up To 5.0GHz On Linux
  2. Intel Launches The Core i7 5960X, Mighty Powerful Haswell-E CPUs
  3. AMD Radeon R9 290: Gallium3D vs. Catalyst Drivers
  4. AMD Radeon R9 290 Open-Source Driver Works, But Has A Ways To Go
Latest Linux Articles
  1. How Intel Graphics On Linux Compare To Open-Source AMD/NVIDIA Drivers
  2. The Fastest NVIDIA GPUs For Open-Source Nouveau With Steam Linux Gaming
  3. Testing For The Latest Linux Kernel Power Regression
  4. The Most Energy Efficient Radeon GPU For AMD Linux Gaming
Latest Linux News
  1. Marek Lands Radeon Gallium3D HyperZ Improvements
  2. Mozilla Firefox 32 Surfaces With HTML5, Developer Changes
  3. Nouveau X.Org Driver Released With DRI3+Present, Maxwell, GLAMOR
  4. Microsoft & AMD Release C++ AMP Compiler With Linux Support
  5. AMD, Wine & Valve Dominated August For Linux Users
  6. Linux 3.17-rc3 Kernel Released Back On Schedule
  7. Lennart Poettering Talks Up His New Linux Vision That Involves Btrfs
  8. Mesa 10.3 RC2 Arrives Via Its New Release Manager
  9. Ubuntu 14.10's Lack Of X.Org Server 1.16 Gets Blamed On AMD
  10. MSI Motherboard BIOS Updating Remains A Pain For Linux Users
Latest Forum Discussions
  1. Best Radeon for a Power Mac G5?
  2. Lennart Poettering Talks Up His New Linux Vision That Involves Btrfs
  3. The dangers of Linux kernel development
  4. Updated and Optimized Ubuntu Free Graphics Drivers
  5. AMD Releases UVD Video Decode Support For R600 GPUs
  6. SSD seems slow
  7. Is laptop with Intel CPU and AMD dGPU worth buying considering especially AMD Enduro?
  8. Radeon HD5670 and Ubuntu 14.04