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I see that modern OpenGL related code uses EGL, i can't get good resources for this so i ask here:
for what i can tell by now it's something similar to FreeGLUT to me, but looks much more portable and standardized. |
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Like postgoodism's answer states, it's Khronos api that basically does the same thing as WGL, GLX, and other platform-specific "gl bootstrapping" libraries do. It also provides some cross-api functionality, like using OpenCL with OpenGL while sharing some resources. In theory, at least. =)
No. Desktop OpenGL doesn't need EGL. Practically all mobile devices that support OpenGL ES are based on EGL, though (I haven't seen a single one where this isn't the case, but then again, I haven't played with iOS devices for example, so I may be wrong).
It's convenient when you're not using some higher-level bootstrapping library like SDL or GLFW, and EGL is available. On the other hand, platform-specific library example code is probably more easily available. YMMV. |
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CAVEAT: This is from the perspective of desktop OpenGL development; things may be different on mobile platforms. EGL is Khronos's attempt to create a unified official cross-platform standard to replace (or at least abstract around) the platform-specific windowing/context-creation APIs like Windows's WGL, Unix's GLX, and Apple's Core GL. It sounds great in theory, but in practice it isn't very widely supported yet. It's certainly not a requirement that modern OpenGL programs use EGL. Right now, EGL is really only relevant if you're using multiple Khronos graphics APIs in the same application, and want them to share a window / rendering context. If you're not using OpenGL, OpenGL ES, OpenMAX|AL, and/or OpenVG simultaneously, EGL probably won't provide you any benefits over an existing cross-platform OpenGL-only windowing system like FreeGLUT/SDL/GLFW/etc. |
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