quote:Original post by Eight Maybe Carmack is *so* good that he had to put innocent looking if statements like that in to slow his engine down.
He probably wrote such an optimised version of Quake3 that it would have run on a 486 but the publishers insisted he raise the minimum CPU requirements.
E
Well...
Maybe that would be the case for COMPILING on a 486.....
It's not hard to see why he did it. For one thing, you can have nested comments with that method. You can also change whether the code is commented out or not by changing the 0 to a 1, although that could also be done this way:
//*
//*/
... but that's a bit awkward. The disadvantage with Carmack's method is that you don't get the syntax highlighting to indicate that it's a comment, but I don't think Carmack would need his comments to be highlighted...
Edited by - Beer Hunter on January 10, 2002 5:22:28 PM
//I forgot what this does...//I can''t remember why (or when) I wrote this, but it seems to work...//I think I saw this in a movie once//I specifically remember forgetting this//I think this lack of sleep (and lack of pants) have made me sterile (wouldn''t be the first time)//I suddenly have a strange mental image of a banana//mmmmm.....Banana.......//So sllepy...cant'' thinc.....so veri veri tired....IF I DONT GET SOME SLEEP SOON THEN I''M GOING TO B(I don''t even remember writing that^)
"I''ve learned something today: It doesn''t matter if you''re white, or if you''re black...the only color that REALLY matters is green" -Peter Griffin
"I've learned something today: It doesn't matter if you're white, or if you're black...the only color that really matters is green"-Peter Griffin
Not having looked at the Quake 2 source I write as an ignorant poster.
#ifdef 0 Comment #endif
Is really the same as
/* comment */
The preprocessor will never expand anything contained inside the ''0''. Some people do this because many compilers give a much saner error message than leaving off a closing */. In particular, they are better about giving the actual line that the comment (in this case) was opened at.
#if 0 the complex cases add new polys on most lines, so dont optimize for keeping them the same have multiple free span lists to try to get better coherence? low depth complexity -- 1 to 3 or so
have a sentinal at both ends? #endif This was found at quake2\quake2\ref_soft\r_edge.c(39)
#if 0 // commented out until H3D pays us the money they owe us GL_DrawStereoPattern(); #endif This was found at quake2\quake2\ref_gl\gl_rmain.c(1329)
Of course it''s precalculated, they''re not random numbers. But i like the other method they used in other parts of the source: int someArray[] = #include "array.h"; array.h has the array data in it. Really nifty.
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I tihnk you should get better things to do. Like maybe LEARN something from the man''s code. For god''s sake, do you know how bored he must have got? THINK ABOUT IT...
