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 Benchmarking Platform
Phoromatic Test Orchestration

Mesa Gets OpenGL 3.0 Floating-Point Depth Buffers

Mesa

Published on 10 July 2011 10:29 PM EDT
Written by Michael Larabel in Mesa
9 Comments

Yet again Marek Olšák has made another great improvement to Mesa. Recently this independent developer has been working quite a lot in implementing OpenGL 3.0 support for the open-source Mesa stack. Ending out this weekend, he now has working OGL3 floating-point depth buffers per the GL_ARB_depth_buffer_float extension.

Via a handful of commits a couple hours ago, Marek landed the depth_buffer_float work. This is for core Mesa and Gallium3D. Fully implementing this support required a fair amount of work, but yet again Marek has managed to deliver. These patches originally appeared on the Mesa mailing list by Marek earlier in the month, but were now just committed to Mesa Git master.

This Phoronix Forums member has also pushed the initial depth_buffer_float render-buffer support into the R600 Gallium3D driver for the Radeon HD 5000 series and newer.

The GL_ARB_depth_buffer_float extension provides new texture internal formats where the depth components are stored as 32-bit floating-point values rather than unsigned integers. As part of it, the extension provides new packed depth/stencil pixel formats too. See more in the Khronos specification.

With floating-point depth buffers in place, all that's left for OpenGL 3.0 support in Mesa is GLSL 1.30 support, completing non-normalized integer texture/frame-buffer formats, transform feedback, completing sRGB frame-buffer support, depth format cube textures, and GLX_ARB_create_context with GLX 1.4+. The big item on the OpenGL 3.0 TODO list is completing the GL Shading Language 1.30 support.

While it will be a great milestone when OpenGL 3.0 finally arrives, the support is coming about five years after the specification was ratified and there's already OpenGL 3.1, 3.2, 3.3, 4.0, and 4.1 support to address too. When the OGL3.0 support is ready, it will be released as Mesa 8.0, which means we may not see Mesa 7.12. This next Mesa release is set to arrive in January.

Again, nice job Marek. On behalf of the Linux community, he's certainly deserving of some complementary Phoronix beer should be choose to come to the X.Org Developers Conference in Chicago or to Oktoberfest/PhoronixFest.

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 Articles & Reviews
  1. Sub-$20 802.11n USB WiFi Adapter That's Linux Friendly
  2. The Lenovo T450s Is Working Beautifully With Linux
  3. Linux 4.0 SSD EXT4 / Btrfs / XFS / F2FS Benchmarks
  4. Linux 4.0 Hard Drive Comparison With Six File-Systems
  5. Lenovo ThinkPad T450s Broadwell Preview
  6. How Open-Source Allowed Valve To Implement VULKAN Much Faster On The Source 2 Engine
Latest Linux News
  1. Library Operating System (LibOS) For Linux Still Being Pursued
  2. C4 Game Engine Continues Supporting Linux
  3. Debian 8.0 Jessie's Installer RC3 Released
  4. Features Thus Far For The Linux 4.1 Kernel
  5. Intel's Turbostat Adds Skylake Support In Linux 4.1
  6. Microsoft's Open-Source Group Merges Back Into The Company
  7. EXT4 In Linux 4.1 Adds File-System Level Encryption
  8. Open-Source Ardour 4.0 Audio Software Has Big Improvements
  9. Linux-Powered Endless Computer Raises $100k+ In A Few Days
  10. GCC 5.1 RC2 Arrives, GCC 5.1 Planned For Next Week
Most Viewed News This Week
  1. Nouveau: NVIDIA's New Hardware Is "VERY Open-Source Unfriendly"
  2. Linux 4.1 Brings Many Potentially Risky x86/ASM Changes
  3. Linux 4.0 Kernel Released
  4. Microsoft Announces An LLVM-Based Compiler For .NET
  5. VirtualBox 5.0 Beta 2 Released
  6. KDBUS Is Taking A Lot Of Heat, Might Be Delayed From Mainline Linux Kernel
  7. LibreOffice 4.5 Bumped To Become LibreOffice 5.0
  8. Linux Audio Is Being Further Modernized With The 4.1 Kernel