Sorry if i didn't said you nick on my post but i really didn't knew it, i add no intention of offending you. About the idtech5 on X360 maybe you didn't realized it but you gave me reason on your on post
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"and he said they're using an API which works similar to D3D" he never said they are using OpenGL on the X360, Microsoft wouldn't allow it, D3D is a Microsoft invented API so they ONLY support that API on the X360, or even the ability to code to the metal and go around the API (To tap the maximum power of the hardware) , and i bet this is what John Carmack is doing for the X360 version.