Path: chuka.playstation.co.uk!scea!peter_alau@playstation.sony.com
From: "Charles Nicholson" <chnicholson@vassar.edu>
Newsgroups: scee.yaroze.programming.2d_graphics,scee.yaroze.beginners
Subject: Re: Trying to display a sprite
Date: Tue, 23 Feb 1999 16:50:00 -0500
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Umm... most of it looks pretty good- You might want to change the line in
InitSprite() that calls GsGetTimInfo though...

Your first parameter, "(u_long *)(spriteAdd + 4)" should probably be changed
to
"(u_long *)(spriteAdd + 1)".

The information that GetTimInfo needs is actually 4 bytes in from the
header.  Since you're casting spriteAdd to a u_long, it will multiply any
addition you do (in this case +4) by the size of a u_long.  The final offset
calculated (in bytes, not dwords) by "(u_long *)(spriteAdd + 4)" is 16 bytes
into spriteAdd.  (u_long *)(spriteAdd + 1) will give you the proper 4 byte
advancement.

This was a real pain for me too... :)

hope i helped.
-charles



>I've just typed out the code at the end of Ira Rainey's tutorial (typed,
not
>copied and pasted, to try and gain some experience, and extra knowledge
from
>doing so. However, I've compiled, and attempted to run, it flashes
something
>very quickly on the screen, and then the screen goes blank, with the thick
>black strips at the top and bottom. Anyway, I've attached the code, so if
>anyone has the chance to look at it, and tell me what's been copied
>incorrectly, or what's in the wrong order, etc. I would be very thankful.
>
>Rikki