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I was reading android source code in that I am not getting what does OPEN GL ES library do and what does EGL library do.?
Is there any relationship between this two libraries?
I have looked at http://www.khronos.org/opengles/documentation/opengles1_0/html/ but still not getting.
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There is no relationship between OpenGL and EGL. EGL generally does not run on desktops, and there is no ability to create a desktop OpenGL context through EGL. OpenGL contexts are instead created and managed by platform-specific APIs. On Windows, the WGL API is used.
The main difference between the two is that OpenGL ES is made for embedded systems like smartphones, while OpenGL is the one on desktops. On the coding level, OpenGL ES does not support fixed-function functions like glBegin/glEnd etc... OpenGL can support fixed-function pipeline (using a compatibility profile).
OpenGL ES is a flavor of the OpenGL specification intended for embedded devices. Android supports several versions of the OpenGL ES API: OpenGL ES 1.0 and 1.1 - This API specification is supported by Android 1.0 and higher. OpenGL ES 2.0 - This API specification is supported by Android 2.2 (API level 8) and higher.
The main library ( libEGL ) is window system neutral. It provides the EGL API entry points and helper functions for use by the drivers. Drivers are dynamically loaded by the main library and most of the EGL API calls are directly dispatched to the drivers. The driver in use decides the window system to support.
EGL is the interface between OpenGL ES and the underlying native display platform. It is used to create & manage rendering surfaces & graphics contexts.
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