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

An Initial Version Of LunarGLASS-LLVM For Mesa

Mesa

Published on 03 February 2011 10:09 AM EST
Written by Michael Larabel in Mesa
7 Comments

In October of last year there was a proposal by LunarG, a small consulting company focusing upon Gallium3D and Mesa that was formed by some of the original Tungsten Graphics crew, to create a common kernel and shader compiler stack. This stack would utilize LLVM (the Low-Level Virtual Machine) for optimizations This work was published as LunarGLASS and there is now a specification and initial implementation of it for Mesa.

The focus is upon removing the number of IRs (intermediate representations) and to turn to using LLVM IR as the common representation. The original LunarGLASS proposal also praised Low-Level Virtual Machine as being a better candidate for being able to handle OpenCL and more complex GLSL (GL Shading Language) going forward.

While the LunarGLASS proposal is very interesting, some parties (such as the Intel developers who last year invested significantly in rewriting Mesa's GLSL compiler) objected to using LLVM IR as it not being the right solution for high and low level optimizations. Some questioned whether this was even possible of using LLVM IR and then translating it to TGSI (the Gallium3D instruction language) or Mesa IR. The end result of LunarGLASS is to reduce the development burden in creating advanced graphics compiler stacks and to increase the level of optimizations for real-world graphics workloads.

LunarG in the months since has been working out to figure if this will indeed work. Today they are indeed announcing progress and that it is in fact working.

LunarG's John Kessenich announced last night on the Mesa mailing list the availability of the LunarGLASS exploration. To prove that LunarGLASS is possible, LunarG had to define the LLVM IR and then to produce a working experiment to see if translating these IRs was possible and efficient.

LunarG has published their initial IR specification at LunarGLASS.org. They have also setup a Google Code page for their current source-code hosting and to have a mailing list discussion group.

John says in his email message, "Results so far are quite encouraging for the few simple shaders we targeted (still absent flow control). In short, we were able to generate identical results to glsl2 when targeting Mesa IR, using LLVM optimizations instead of glsl2 optimizations. That is, going through the path GLSL -> glsl2-front-end -> Top-IR -> LLVM optimizations -> Mesa-IR."

While this is certainly progress in the right direction, it's not yet production-ready and the LunarGLASS design is still subject to change.

LunarG has put LunarGLASS code under the GPLv2 and the specification under the Creative Commons Attribution No Derivatives license. Though when digging around the LunarGLASS web-site, contributions to LunarGLASS must require accepting LunarG's contributors agreement

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. MSI X99S SLI PLUS On Linux
  2. NVIDIA GeForce GTX 970 Offers Great Linux Performance
  3. CompuLab Intense-PC2: An Excellent, Fanless, Mini PC Powered By Intel's i7 Haswell
  4. From The Atom 330 To Haswell ULT: Intel Linux Performance Benchmarks
Latest Linux Articles
  1. RunAbove: A POWER8 Compute Cloud With Offerings Up To 176 Threads
  2. 6-Way Ubuntu 14.10 Linux Desktop Benchmarks
  3. Ubuntu 14.10 XMir System Compositor Benchmarks
  4. Btrfs RAID HDD Testing On Ubuntu Linux 14.10
Latest Linux News
  1. Fedora 21 Beta & Final Release Slip Further
  2. Mesa 10.3.2 Has A Couple Bug-Fixes
  3. RadeonSI/R600g HyperZ Support Gets Turned Back On
  4. openSUSE Factory & Tumbleweed Are Merging
  5. More Fedora Delays: Fedora 21 Beta Slips
  6. Mono Brings C# To The Unreal Engine 4
  7. Coreboot Now Has Support For Intel Broadwell Hardware
  8. Enlightenment's EFL 1.12 Alpha Has Evas GL-DRM Engine, OpenGL ES 1.1 Support
  9. GTK+ Lands Experimental Backend For Mir Display Server
  10. Ubuntu 14.10 Officially Released
Latest Forum Discussions
  1. AMD Radeon VDPAU Video Performance With Gallium3D
  2. HOPE: The Ease Of Python With The Speed Of C++
  3. Updated and Optimized Ubuntu Free Graphics Drivers
  4. Ubuntu 16.04 Might Be The Distribution's Last 32-Bit Release
  5. Linux hacker compares Solaris kernel code:
  6. Advertisements On Phoronix
  7. Users/Developers Threatening Fork Of Debian GNU/Linux
  8. AMD Releases UVD Video Decode Support For R600 GPUs