EGL vs. GL

Attribute	EGL	GL
Definition	Embedded Graphics Library	Graphics Library
Purpose	Designed for embedded systems	General-purpose graphics rendering
API	Higher-level API	Lower-level API
Functionality	Provides higher-level abstractions	Provides lower-level access to graphics hardware
Compatibility	Compatible with OpenGL ES	Compatible with OpenGL

When it comes to graphics programming, two popular APIs that are often compared are EGL (Embedded-System Graphics Library) and GL (Graphics Library). Both APIs have their own set of attributes and features that make them suitable for different types of applications. In this article, we will explore the differences between EGL and GL to help you understand which one may be more suitable for your specific needs.

Overview

EGL is an interface between Khronos rendering APIs such as OpenGL ES or OpenVG and the underlying native platform window system. It is designed to provide a platform-independent way to create and manage rendering contexts, surfaces, and devices. On the other hand, GL is a cross-platform API for rendering 2D and 3D graphics. It provides a set of functions for rendering geometric primitives, textures, and shaders.

Platform Support

One of the key differences between EGL and GL is their platform support. EGL is specifically designed for embedded systems and provides a way to abstract the underlying window system. It is commonly used in mobile devices, set-top boxes, and other embedded systems. GL, on the other hand, is more widely supported across different platforms including desktop computers, mobile devices, and game consoles.

Functionality

When it comes to functionality, EGL is focused on providing a way to create and manage rendering contexts, surfaces, and devices in a platform-independent manner. It is often used in conjunction with other Khronos APIs such as OpenGL ES for rendering graphics on embedded systems. GL, on the other hand, provides a wide range of functions for rendering 2D and 3D graphics, including support for shaders, textures, and geometric primitives.

Performance

Performance is another important factor to consider when comparing EGL and GL. EGL is designed to be lightweight and efficient, making it well-suited for resource-constrained embedded systems. It provides a way to create rendering contexts and surfaces with minimal overhead. GL, on the other hand, may have more overhead due to its broader range of functionality and platform support.

Compatibility

Compatibility is also a key consideration when choosing between EGL and GL. EGL is designed to work with other Khronos APIs such as OpenGL ES and OpenVG, making it a good choice for developers who are already familiar with these APIs. GL, on the other hand, is a standalone API that can be used independently of other Khronos APIs, providing more flexibility for developers who may not need the additional features provided by EGL.

Community Support

Community support is another factor to consider when choosing between EGL and GL. GL has a larger and more established community of developers, making it easier to find resources, tutorials, and support online. EGL, on the other hand, may have a smaller community due to its focus on embedded systems, which could make it more challenging to find help and resources.

Conclusion

In conclusion, EGL and GL are both powerful graphics APIs with their own set of attributes and features. EGL is designed for embedded systems and provides a platform-independent way to create and manage rendering contexts, surfaces, and devices. GL, on the other hand, is a cross-platform API for rendering 2D and 3D graphics with a wide range of functionality and platform support. When choosing between EGL and GL, it is important to consider factors such as platform support, functionality, performance, compatibility, and community support to determine which API is best suited for your specific needs.