Today with tools like Unity3d, UDK, CryEngine, Shiva Engine, MonoGame etc, game developers are at a point where they can pretty much stop worrying about the OpenGL/DirectX layer beneath their engines. Those Engines have become so powerful and affordable that it hardly makes any sense to roll your own. In fact, imo you would need a very strong reason to build your own engine these days instead of focusing on your product.
Soon all of these will support WebGL/HTML5 as a target and even render most of the (still very basic) WebGL engines obsolete.
Now if you were in the business of creating your own tools or engine, you would need to support both of OpenGL and DirectX to be able to support all the major platforms anyway.
Today with tools like Unity3d, UDK, CryEngine, Shiva Engine, MonoGame etc, game developers are at a point where they can pretty much stop worrying about the OpenGL/DirectX layer beneath their engines. Those Engines have become so powerful and affordable that it hardly makes any sense to roll your own. In fact, imo you would need a very strong reason to build your own engine these days instead of focusing on your product.
Soon all of these will support WebGL/HTML5 as a target and even render most of the (still very basic) WebGL engines obsolete.
Now if you were in the business of creating your own tools or engine, you would need to support both of OpenGL and DirectX to be able to support all the major platforms anyway.