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Originally Posted by Richard M
So is Doom.
DirectX is more than just Direct3D - it's sound (for 5.1/7.1 support), DirectInput, DirectPlay (chat and multiplayer) and quite a bit more.
They probably mean it uses DirectX 9 hardware features like advanced Pixelshader, just like Doom does, but in the OpenGL API.
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Yeah, I know what DirectX is
First off, Doom3 should not be classed as DX9 at all, it's OpenGL 1.5.
Secondly the finished version of Half-Life 2 will actually use both API's, but is Direct3D/DX9 by nature and default. Plus do you really think HL2 would be faster on ATI hardware if it were OpenGL only? The choice of DX9 just wasn't available for some reason on the leak.