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. Intel Xeon E5-1680 v3 & E5-2687W v3 Compared To The Core i7 5960X On Linux
  2. Intel 120GB 530 Series SSD Linux Performance
  3. Btrfs/EXT4/XFS/F2FS RAID 0/1/5/6/10 Linux Benchmarks On Four SSDs
  4. AMD's Windows Catalyst Driver Remains Largely Faster Than Linux Drivers
Latest Linux Articles
  1. NVIDIA vs. Nouveau Drivers With Linux 3.18 + Mesa 10.4-devel
  2. Is The Open-Source NVIDIA Driver Fast Enough For Steam On Linux Gaming?
  3. Linux 3.18 File-System Performance Minimally Changed But Possible Regressions
  4. AMD Radeon Gallium3D Is Catching Up & Sometimes Beating Catalyst On Linux
Latest Linux News
  1. Linux 3.18-rc6 Released, A Worrisome Regression Remains
  2. HandBrake 0.10 Brings H.265 & VP8 Encoders
  3. Gngr: A New Web Browser Focused On Privacy
  4. Linux 3.18 Kernel: Not Much Change With Intel Haswell Performance
  5. More File-System Tests Of The Linux 3.18 Kernel
  6. Using NVIDIA's NVENC On Linux With FFmpeg
  7. There's Talk Again About An "Open To The Core" Ubuntu Laptop
  8. PowerVR SGX Driver Code Gets Leaked
  9. V2 Of KDBUS Published For Linux Kernel Review
  10. VirtualBox 4.3.20 Arrives, Still No Sign Of VirtualBox 4.4
Latest Forum Discussions
  1. PulseAudio 6.0 Is Coming & Other Linux Audio Plans For The Future
  2. Debian Developer Resigns From The Systemd Maintainership Team
  3. Roadmap to Catalyst 14.10 ?
  4. Updated and Optimized Ubuntu Free Graphics Drivers
  5. Cant get working Kaveri APU - A10-7850k
  6. Script for Fan Speed Control
  7. Debian Init System Coupling Vote Results
  8. The Slides Announcing The New "AMDGPU" Kernel Driver