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

A New GLSL Backend For Doom 3

Gaming

Published on 23 April 2012 04:02 AM EDT
Written by Michael Larabel in Gaming
1 Comment

There's a new open-source GLSL renderer back-end for the open-source Doom 3.

Oliver McFadden, the developer that wrote the Radeon Revenge reverse-engineering utility, was thinking about writing an open-source BIOS for Radeon GPUs, and brought ioquake3 to the Nokia N900, decided to write a new GL Shading Language (GLSL) renderer back-end for the id Tech 4 engine.

There's already been some GLSL renderers available for Doom 3, but none that had worked on McFadden's i965 hardware nor did they render correctly (or produced pixel errors), so he wrote a new back-end that would work.

McFadden's new GLSL renderer for Doom 3 is working but not yet fully complete. He talks about the work on his blog.

A New GLSL Backend For Doom 3

At this point his GLSL renderer appears to just be a personal project and hasn't been merged into ioDoom3 or any other code-base yet.

A New GLSL Backend For Doom 3

In terms of what's going on with ioDoom3, there is one GLSL renderer already being worked on in ioDoom3. From its merge request:
This merge request includes a new GLSL backend, which can be used to replace the current ARB2 backend. Should come in handy for many mod teams due to id software not including the actual shader files themeselves in the source archive.

Right now, only the interaction, ambient interaction, and stencil shadow shaders have been rewritten to GLSL. It's definatly not 100% equivalent, since I am not using the normalization cubemap or the specular lookup table, but should be around the same speed wise (if not faster in some areas) and look a lot better.

The heathaze, glass, and environment shaders still need to be done.

I also fixed two-sided stencil shadowing by using the vendor neutral OpenGL 2.0 glStencilOpSeparate functionality and removed the unused nvidia and ati extensions. This gives a nice performance increase in heavily shadowed areas.
However, in terms of commits to the official ioDoom3 Git repository, there's sadly been no commits since last December... The ioDoom3 mailing list has also been light on activity. However, there has been commits to various branches/forks as illustrated on this Gitorious page.

There is also another open-source Doom 3 engine fork called DHEWM3 and can be found on GitHub. This code has sadly not been touched since the middle of January.

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. A Walkthrough Of The New 32 System Open-Source Linux Benchmarking Test Farm
  2. Habey MITX-6771: Mini-ITX Board With Quad-Core J1900 Bay Trail
  3. OCZ Vector 150 SSD On Linux
  4. Noctua i4 CPU Cooler: Great For Cooling High-End LGA-2011v3 CPUs
Latest Linux Articles
  1. AMD Kaveri: Open-Source Radeon Gallium3D vs. Catalyst 14.12 Omega Driver
  2. 12-Way AMD Catalyst 14.12 vs. NVIDIA 346 Series Linux GPU Comparison
  3. AMD Catalyst 14.12 Omega Driver Brings Mixed Results For Linux Users
  4. 6-Way Winter 2014 Linux Distribution Comparison
Latest Linux News
  1. After 10+ Years, NetworkManager Reaches v1.0
  2. VDPAU Updated To v0.9
  3. An Open Hardware Random Number Generator Proposed
  4. LLVM 3.6 Will Be Branched Next Month
  5. Opera Browser Puts Out Linux Updates For The Holidays
  6. GNOME Shell 3.15.3 Adds Support For High-Contrast Themes
  7. Linux 3.19: ThinkPad Muting Redone, New Dell Backlight Support, Acer Is Banging
  8. KVM Drops Support For IA64 While Adding Various x86 Improvements
  9. GCC 4.8.4 Officially Released
  10. FSF's High Priority Project List Now Has A Committee
Latest Forum Discussions
  1. XLennart: A Game For Systemd Haters With Nothing Better To Do
  2. Need some hand holding with upgrading xserver
  3. Debian init discussion in Phoenix Wright format
  4. The New SuperTuxKart Looks Better, But Can Cause GPU/Driver Problems
  5. FPS capped on Linux (AMD fglrx drivers)
  6. Are there an app using HSA ?
  7. Bench specific mount point
  8. Tool for measuring FPS in games