Path: chuka.playstation.co.uk!news
From: "pal" <pal_news@hotmail.com>
Newsgroups: scee.yaroze.freetalk.english
Subject: Re: Newbie needs basic help
Date: 17 Nov 2001 23:55:01 GMT
Organization: PlayStation Net Yaroze (SCEE)
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References: <9t4jt2$ob41@www.netyaroze-europe.com>
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Hi Greg,

1. about the struct stuff:

Compilers that are not overly old can treat 'x' as 'struct x' when
appropriate. This is standard Ansi C now I think (can't tell which precise
standard however ;) ). So in most cases you don't have to use the 'struct'
keyword other than when defining struct's.

However... From what I've seen, the gcc which comes with NY does not allow
this. This can quickly get annoying. A common workaround is to use
typedef's for all your struct's definitions. This is the way libps's
struct's are defined (have a look at <libps.h>).

typedef struct {
...
} X;

Then you can use simply 'X' where you mean 'struct X' ('struct X' should
not work however).
This is not always possible but in most cases it's welcome. In some cases
you'll prefer:

struct struct_X {
...
};
typedef struct_X X;

PS beware to spell 'struct' in low case - 'Struct' and 'STRUCT' will be
understood as identifiers.

2. about the OT stuff:

I cant tell *precisely*, and I'm not sure I understood the question, and
I'm sure someone will be able to answer that one better than me, but here
is how I understand it anyway:

An OT needs a piece of memory to store its "things to draw" in. This piece
of memory is just a bunch of GsOT_TAG for convenience (if you can tell what
a GsOT_TAG is that is; to me it's just a bunch of bits). The second
dimension in your example is the amount of memory reserved for one OT. This
becomes clearer when in your code you need to initialize the GsOT's org
field:

WorldOT[0].org = WorldTags[0];
WorldOT[1].org = WorldTags[1];

so that you have 2 GsOT's, each one pointing to an array of N GsOT_TAG's
(in your case, N is NO_OF_SPRITES*sizeof(GsSPRITE)).

hope this helps,
pal