Open Source video drivers + Mesa + Gallium. I am confused.
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Драйвер gallium

Gallium3D is a set of interfaces and a collection of supporting libraries [2] intended to ease the programming of device drivers for 3D graphics chipsets for multiple operating systems, rendering or video acceleration APIs.

A feature matrix is being provided at GalliumStatus , and the efforts of writing free and open-source device drivers for graphics chips is being separately documented in the Wikipedia: Free and open-source graphics device driver.

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The development of Gallium3D started in at Tungsten Graphics, [3] and the implementation is available as free and open-source software as part of Mesa 3D hosted by freedesktop. The primary goal of making driver development easier, bundling otherwise duplicated code of several different drivers at a single point, and to support modern hardware architectures.

Gallium3D Technical Overview

This is done by providing a better division of labor, for example, leaving memory management to the kernel DRI driver. Gallium3D has been a part of Mesa since [4] and is currently used by the free and open-source graphics driver for Nvidia nouveau project , [5] [6] for R — R , [7] [8] [9] and for other free and open-source GPU device drivers.

Gallium3D eases programming of device drivers by splitting the graphics device driver into three parts. This is accomplished by the introduction of two interfaces: Gallium3D State Tracker Interface and the Gallium3D WinSys Interface.

The three components are called:. Gallium3D provides a unified API exposing standard hardware functions, such as shader units found on modern hardware.

Драйвер gallium

By contrast, classic-style DRI device drivers require a different back-end for each hardware platform and several other APIs need translation to OpenGL at the expense of code duplication. Under Gallium3D, Direct Rendering Manager DRM kernel drivers will manage the memory and Direct Rendering Interface DRI2 drivers will be more GPU processing oriented.

Драйвер gallium

Gallium3D additionally requires a level of shader support that is not available on older cards like e. ATi rr so users for those cards need to keep using Mesa 3D with DRI2 for their 3D usage. Tungsten Graphics Shader Infrastructure TGSI is an Intermediate representation like LLVM Intermediate Representation or the new Standard Portable Intermediate Representation SPIR to be used by the Vulkan API and OpenCL 2.

TeraScale microarchitecture , Graphics Core Next , Tesla microarchitecture , etc. In addition, using the modular structure of Gallium3D, there is an effort underway to use the LLVM compiler suite and create a module to optimize shader code on the fly. The library represents each shader program using an extensible binary intermediate representation called Tungsten Graphics Shader Infrastructure TGSI which LLVM then translates into GLSL shaders optimized for target hardware.

Several free and open-source graphics device drivers , which have been, or are being written based on information gained through clean-room reverse engineering , adopted the driver model provided by Gallium3D, e. The main reason may be that the Gallium3D driver model lessens the amount of code required to be written. Original authors of Gallium3D were Keith Whitwell and Brian Paul at Tungsten Graphics acquired by VMware in As of fall , there were at least 10 known, mature and working Gallium3D drivers.

Nouveau development is done exclusively for the Gallium framework. The old DRI driver was removed from the master branch of the Mesa repository on Freedesktop. Gallium3D can run on Linux as well as FreeBSD kernels. Zack Rusin from Tungsten Graphics added the OpenVG state tracker to Mesa 3D, [21] which enables Scalable Vector Graphics to be hardware-accelerated by any Gallium3D-based driver. Initial support for the Evergreen GPUs was added to the rg driver.

There are two Gallium3D drivers for ATI hardware known as rg and rg for RR and REvergreen GPUs respectively. Major commits were made to the code to support Direct3D 10 and Intel g and Cell Gallium drivers were removed from the master branch of Mesa as unmaintained and broken. Major commits were made to the code to support Direct3D 9.

Драйвер gallium

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