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

Mesa DRI PRIME Support Comes To Wayland

Wayland

Published on 07 November 2013 07:49 PM EST
Written by Michael Larabel in Wayland
13 Comments

DRI PRIME that allows for secondary GPUs to provide rendering support to primary GPUs -- i.e. NVIDIA Optimus systems -- can now work under Wayland for allowing secondary GPUs to render games/applications even if they aren't the GPU used by the compositor.

The DRI PRIME Wayland support isn't via changes to the Wayland protocol or even to the Weston compositor, but namely come down to Mesa changes. The Mesa Wayland EGL back-end doesn't support DRM render-nodes but that is changing soon through the use of __DRIimage. These Mesa patches for the DRI_PRIME support for Wayland allow an id_path_tag to a specific GPU to be set via an environment variable or the traditional method of setting DRI_PRIME=1 for falling back to secondary GPUs.

The DRI PRIME Wayland rendering on secondary GPUs will allocate buffers without tiling to render to compared to the X.Org Server PRIME where it renders to a tiled buffer and a copy mechanism to pass the buffer to the primary GPU. The Wayland PRIME implementation is slower than if no PRIME is utilized, but a new solution is still being devised.

A more ideal and performant situation is using an embedded Wayland compositor on the secondary GPU and then run the game/application inside there, which in turn is shared with the main compositor. Axel Davy, the developer that published these DRI_PRIME Wayland patches today, is planning to write a Weston shell designed for embedded full-screen games to make Weston resize to the game and close the embedded compositor when the game closes.

This embedded compositor implementation designed for gaming would be more flexible and avoid a buffer copy for full-screen games, but the user would have to use a script for launching the game. Over DRI2 PRIME with an X.Org Server, v-sync will always be supported and the PRIME design is much simpler.

These Mesa DRI PRIME Wayland back-end patches can be found on the Mesa-dev mailing list. This work is going to be out of the question for Mesa 10.0 due to the imminent branching but it should be on the table for the next Mesa release in three months.

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. 17-Way Linux Graphics Card Comparison With Civilization Beyond Earth
  2. AMD Kaveri: Open-Source Radeon Gallium3D vs. Catalyst 14.12 Omega Driver
  3. 12-Way AMD Catalyst 14.12 vs. NVIDIA 346 Series Linux GPU Comparison
  4. AMD Catalyst 14.12 Omega Driver Brings Mixed Results For Linux Users
Latest Linux News
  1. Fedora Doesn't Yet Enable F2FS File-System Support
  2. XZ 5.2 Adds New Multi-Threaded Options
  3. Intel 2.99.917 X.Org Driver Released, 3.0 Release Finally Near
  4. Server-Side XCB Is Being Discussed For The X.Org Server
  5. Adreno A4xx Rendering With Freedreno Takes Shape
  6. Linux 3.19-rc1 Kernel Released Ahead Of Schedule
  7. X.Org Server 1.16.3 Released To Fix Security Issues
  8. Linux 3.19 Merge Window Closes Ahead Of Schedule
  9. MIPS R6 Architecture Now Supported By GCC
  10. LowRISC To Feature Tagged Memory & Minion Cores
Latest Forum Discussions
  1. Maker3D - create your 3D RPG
  2. Need some hand holding with upgrading xserver
  3. Speeding up systemd networking service
  4. FPS capped on Linux (AMD fglrx drivers)
  5. Major Performance Breakthrough Discovered For Intel's Mesa Driver
  6. Looking for an nVidia GPU, but not sure how well they are supported.
  7. Are there an app using HSA ?
  8. The New SuperTuxKart Looks Better, But Can Cause GPU/Driver Problems