Lycander said:Both UT '04 and Doom3 have OpenGL renderers. HL2 is strictly Direct3D. Even though Direct3D can be ported into OpenGL, again it's the Havok physics engine that's the next obstacle. Put it all together and it's not financially feasible.
HL2 for XBox is not a port. An Xbox is just an under glorified PC. It uses a Pentium 3 700 MHz and GeForce 3.