Path: chuka.playstation.co.uk!news
From: "Nick Slaven" <NickSlaven@compuserve.com>
Newsgroups: scea.yaroze.programming.2d_graphics
Subject: Re: BG Problem
Date: Sun, 6 Sep 1998 21:18:14 +0100
Organization: PlayStation Net Yaroze (SCEE)
Lines: 83
Message-ID: <6suqri$66616@chuka.playstation.co.uk>
References: <35f2c71f.16917324@news.playstation.co.uk>
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Khan <2bad@lineone.net> wrote in message
<35f2c71f.16917324@news.playstation.co.uk>...
>But I am still stuck with adding a 2D background to my 3D racing game.
>I've got George Bain's stuff but thats just for displaying sprites,
>isnt it?


Well I must admit I havn't read through all of Georges stuff, but I know for
certain
there is some code that shows how to use the BG functions ( there was a bit
of controversy on this code about a month ago amongst Yarozers) keep
looking.

>By the way I made some added a backrond code to my game, which
>compiles and links ok but when the auto file tells it to go it
>freezes. I really dont know whats going wrong.


Did it work before you added the code ??
Golden rule number 1 in coding - _always_ check the last thing you
did, & work back when things stop working.
You may have run out of packet space, try increasing the size of your packet
area.

>Sorry about the messy code!

no probs, - why not stick your entire project on your web site for us
to look at, I find bugs easier to find with a debugger, don't worry
no one here is going to steal your ideas.
The one thing that really stands out a mile is the way you typedef
your structures.

for instance :
>typedef struct
>

>  long                              numberObjects;
>  GsDOBJ2                   Object_Handler[GROUND_MAX_OBJECTS];
>  GsCOORDINATE2    Object_Coord[GROUND_MAX_OBJECTS];
>  u_long                          *Back_Pointer[GROUND_MAX_OBJECTS];
>  u_long                          *Object_Pointer[GROUND_MAX_OBJECTS];
>  }  Track_Header0,Track_Header1,Track_Header2,Track_Header3,Track_Header4;
>Track_Header0     TrackData;                          // create instance of
structure for use
>Track_Header1     Track1Data;
>Track_Header2     Track2Data;
>Track_Header3     Track3Data;
>Track_Header4     Track4Data;


You've created 5 different typedefs for the same structure

typedef struct
{                                                                   
  long                              numberObjects;                       
  GsDOBJ2                   Object_Handler[GROUND_MAX_OBJECTS]; 
  GsCOORDINATE2    Object_Coord[GROUND_MAX_OBJECTS];
  u_long                          *Back_Pointer[GROUND_MAX_OBJECTS];
  u_long                          *Object_Pointer[GROUND_MAX_OBJECTS];
}  Track_Header0;
Track_Header0     TrackData;                          // create instance of structure for use
Track_Header0     Track1Data;                          
Track_Header0     Track2Data;                          
Track_Header0     Track3Data;                          
Track_Header0     Track4Data;                          

is a lot more readable. 

As I said earlier it would be easier to diagnose the problem with your code if we can see it in 
action.


Nick S