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. Trying The Configurable 45 Watt TDP With AMD's A10-7800 / A6-7400K
  2. Sumo's Omni Gets Reloaded
  3. AMD A10-7800 & A6-7400K APUs Run Great On Linux
  4. Radeon Gallium3D Is Running Increasingly Well Against AMD's Catalyst Driver
Latest Linux Articles
  1. Intel's Latest Linux Graphics Code Competes Against OS X 10.9
  2. Intel Sandy Bridge Gets A Surprise Boost From Linux 3.17
  3. Open-Source Radeon Graphics Have Some Improvements On Linux 3.17
  4. CPUFreq Scaling Tests With AMD's Kaveri On Linux 3.16
Latest Linux News
  1. Mesa 10.3 Branched & RC1 Released, Mesa 10.4 On Master
  2. Intel Sandy Bridge Gains On Linux 3.17 Extend Beyond Graphics
  3. LinuxCon: What's Going On With Fedora.Next
  4. Canonical Joined The Khronos Group To Help Mir/Wayland Drivers
  5. EFL 1.11 Is A Big Milestone For Enlightenment Users
  6. DirectFB Updates GTK3 Support, Working Towards DirectFB 1.8
  7. Userptr Support Set For AMD Radeon GPUs In Linux 3.18
  8. NVIDIA Releases CUDA 6.5 As A Huge Update
  9. GNOME 3.14 Beta Makes GLSL Optional, Supports Wayland Gesture/Touch Events
  10. The Many Things You Can Build With A Raspberry Pi
Latest Forum Discussions
  1. AMD Offers Mantle For OpenGL-Next, Pushes Mantle To Workstations
  2. Systemd 216 Piles On More Features, Aims For New User-Space VT
  3. ATI CrossFire Does Not Support On This Platform When Enabling (Ubuntu Lucid)
  4. Dead Island for Linux (?)
  5. The dangers of Linux kernel development
  6. Remote gui not accessible in Phoronix Test Suite 5.2
  7. Updated and Optimized Ubuntu Free Graphics Drivers
  8. Next-Gen OpenGL To Be Announced Next Month