GLSL Hacker 0.5.0 (Windows / Mac OS X / Linux)
...there are many definite pros to using a standard 3D API. It's likely that your game will run on a wide range of hardware, and you'll get easy access to the latest shader technologies without having to muck around with scary low-level code. However, the performance overhead of DirectX, particularly on the PC architecture, is apparently becoming a frustrating concern for games developers speaking to AMD. ...it looks as though DirectX's future as the primary gateway to PC graphics hardware is no longer 100 per cent assured, especially when it comes to cutting edge graphics.