What is the best implementations of OpenGL ?

Question

What is the best implementations of OpenGL in C++ ? please compare them.

PS. Take a look at Here

Answer 1

You are not correctly understanding what OpenGL is. OpenGL is a low-level library that lets you render 3D graphics. 3D graphics can be rendered either in software or hardware. All graphics card vendors (NVIDIA, ATI, Intel, etc) provide an OpenGL implementation that works with their video cards. Software vendors like Microsoft provide OpenGL implementations that can render in software. Mesa 3D, which I linked to in another question of yours, is a software implementation.

Game engines, however, sit on top of OpenGL. They use OpenGL to draw their 3D content (or alternatively they use DirectX). If your game engine targets OpenGL, it will run on top of (in theory) any OpenGL implementation, and the implementation it runs on will depend on what kind of graphics card the user has. If he has an NVIDIA card, then the game engine will use NVIDIA's OpenGL implementation, etc.

You should be more concerned about whether you want to target DirectX or OpenGL with your game engine than about a particular OpenGL implementation.