I am going to do some rendering experiments on a large scale computer system with massive number of processors. This system uses some Intel Xeon E5 processors and Intel Xeon Phi co-processors. I've read documents and developer guide of Xeon Phi co-processor but none of them mention details about OpenGL or DirectX.
I'm not familiar with Xeon Phi co-processor and I want to know if it supports OpenGL or DirectX for graphic processing on hardware level.
Technically OpenGL depends on nothing. Pure software implementations of OpenGL are perfectly valid and do exist. For example the Mesa softpipe implementation; you could try to optimize it for the Xeon Phi, though I doubt you'll beat even the most humble low cost entry level GPUs with it.
Of course most of the time you want OpenGL to be accelerated by a dedicated GPU. But a Xeon Phi optimized OpenGL implementation certainly is feasible (though doesn't exist to my knowledge). When Intel was pushing their Larrabee architecture it was meant as a new approach on realtime graphics; a OpenGL implementation for Larrabee would have been part of it. But Larrabee never saw the light of the world, it remained a Intel research project.