EGL (API)

EGL is an interface between Khronos rendering APIs (such as OpenGL, OpenGL ES or OpenVG) and the underlying native platform windowing system. EGL handles graphics context management, surface/buffer binding, rendering synchronization, and enables "high-performance, accelerated, mixed-mode 2D and 3D rendering using other Khronos APIs."^[2] EGL is managed by the non-profit technology consortium Khronos Group.

EGL (OpenGL)

Original author(s)	Khronos Group
Developer(s)	Khronos Group
Stable release	1.5[1] / March 19, 2014; 10 years ago (2014-03-19)
Written in	C
Operating system	Cross-platform
Platform	Cross-platform
Type	API
Website	www.khronos.org/egl/

The acronym EGL is an initialism, which starting from EGL version 1.2 refers to Khronos Native Platform Graphics Interface.^[3] Prior to version 1.2, the name of the EGL specification was OpenGL ES Native Platform Graphics Interface.^[4] X.Org development documentation glossary defines EGL as "Embedded-System Graphics Library".^[5]

Adoption

As an interface between OpenGL ES or OpenVG and the underlying windowing system, EGL has found wide adoption

Wayland clients use EGL to directly draw into the framebuffer. The display server sits between the kernel (here: Linux kernel) and its clients. It communicates with its clients over a given protocol.

The free implementations of the Wayland (display server protocol) rely upon the Mesa implementation of EGL. A special library called libwayland-EGL was written to accommodate the access to the framebuffer

• The BlackBerry 10 and BlackBerry Tablet OS mobile device operating system uses EGL for 3D graphics rendering. Both support EGL version 1.4.^[6]
• The Android mobile device operating system uses EGL for 3D graphics rendering.^[7]
• The Wayland display server protocol uses EGL.^[8] It is implemented in a way that Wayland clients will draw directly to the framebuffer using EGL.
• Mesa 3D has an implementation of EGL formerly known as Eagle.^[9]
• The Mir display server protocol by Canonical Ltd. uses EGL.^[10]
• The Simple DirectMedia Layer toolkit has been ported to use EGL. It can use Xlib, write directly to the framebuffer or use EGL.
• The Raspberry Pi single-board computer has an EGL interface to hardware-accelerated 3D graphics rendering.^[11]
• The proprietary Nvidia driver 331.13 BETA from 4 October 2013 supports the EGL API.^[12]
• Tizen OS uses EGL with either OpenGL ES 1.1 or OpenGL ES 2.0 for 3D graphics rendering^[13]

Implementations

• Mesa is a free and open-source software implementation of many graphic rendering APIs; among them is EGL.
• Generic Buffer Management is an API to manage buffers.

See also

• WGL – the equivalent Windows interface to OpenGL
• CGL – the equivalent OS X interface to OpenGL
• GLX – the equivalent X11 interface to OpenGL
  • AIGLX – an attempt to accelerate GLX
• WSI – the Vulkan Window System Interface (WSI) does for Vulkan what EGL does for OpenGL ES.

References

1. "Press Release, Khronos Releases EGL 1.5 Specification". Khronos Group. 2014-03-19. Retrieved 2014-03-20.
2. "EGL Overview, Native Platform Interface". The Khronos Group. July 19, 2011.
3. Jon Leech (ed.). "Khronos Native Platform Graphics Interface (EGL Version 1.2) (July 28, 2005)" (PDF).
4. Jon Leech (ed.). "OpenGL® ES Native Platform Graphics Interface (Version 1.0)" (PDF).
5. "Glossary". X.Org Foundation.
6. "Developer Guide". Archived from the original on 2013-10-10. Retrieved 2014-05-28.
7. "Android 2.3 Gingerbread, New Features". Android Developers.
8. Pekka Paalanen (10 March 2012). "What does EGL do in the Wayland stack".
9. "EGL — The Mesa 3D Graphics Library latest documentation". Mesa 3D Documentation.
10. "MirSpec". Archived from the original on 2013-03-06. Retrieved 2013-03-07.
11. "Raspberry Pi VideoCore APIs - eLinux.org". elinux.org.
12. "Added support for the EGL API on 32-bit platforms. Currently, the supported client APIs are OpenGL ES 1.1, 2.0 and 3.0, and the only supported window system backend is X11". 2013-10-04. Retrieved 2013-10-05.
13. "Porting Guide/Graphics and UI - Tizen Wiki".

External links

• Official website