Path: chuka.playstation.co.uk!news
From: "Rad" <rad@cyberdude.com>
Newsgroups: scee.yaroze.programming.2d_graphics
Subject: Re: pmode in GsIMAGE
Date: Sun, 28 Feb 1999 14:26:01 -0000
Organization: PlayStation Net Yaroze (SCEE)
Lines: 76
Message-ID: <7bbjm6$abn3@chuka.playstation.co.uk>
References: <7ba63i$9po27@chuka.playstation.co.uk>
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Hi Rikki,

Try this:

switch (tim.pmode)
{
    case 0x08 :sprite->w=tim.pw*4; /* If sprite is 4 bit, make width 4 times
bigger */
    break;
    case 0x09 :sprite->w=tim.pw*2; /* If sprite is 8 bit, make width 2 times
bigger */
    break;
    default :sprite->w=tim.pw; /* Else set it to width got from tim info */
    break;
}

That should work.

Rad.
rad@cyberdude.com
http://www.netyaroze-europe.com/~radpsx


Rikki Prince wrote in message <7ba63i$9po27@chuka.playstation.co.uk>...
>I'm currently trying to write a function which will set up a sprite, just
by
>passing as few  as possible parameters i.e. only the absolutely needed ones
>are passed: TIM address, pointer to sprite etc. However, one thing that I
>cannot currently get to work is getting the function to work out within
>itself whether the TIM is 4bit CLUT, 8bit CLUT or otherwise. From the look
>of the GsIMAGE structure in the library reference manual, I should be able
>to read the pmode member and work out whether it is 4bit, 8 bit or
>otherwise. However, when I put this in a switch statement, it doesn't work.
>I've also tried it in an if/else if/else setup, and it still doesn't work.
>I've just realised I should have put this earlier in the message, but the
>problem I'm having is (constructing sentences and messages!! lol) trying to
>set the width of the sprite in the GsSPRITE structure, as when the TIM is
>4bit, you need to *4, and when it's 8bit you need to *2 (something I picked
>up from the Ira Rainey tutorial). As this is going to be a function I'll
>need to use for different TIMs, and therefore not specific, I need it to
>work out for itself whether the TIM is 4/8/16 bit etc. I've got it partly
>working, by putting in  if((tim.pmode>>3)&0x01) sprite->w=tim.pw*2;  the
>'if' part of which I took from the texture load in Peter Passmore's 3d
>tutorial, but I believe (well, guess) this bit manipulation tests whether
>it's one of 8 or 4 bit, not either individually, which is what I want!
>
>Basically in conclusion, I need some help on how I can test to see if the
>sprite is 4bit/8bit/otherwise, so I can set the width accordingly,
something
>which seems not to work normally, and only with bits shifts and clever
>tricky stuff which the 286 in me 'ead don't seem to be able to cope with.
>
>Thanks in advance to anyone who can decipher what I've said in the
preceding
>message, and decides to help this poor little beginner :-)
>
>Rikki
>
>
>PS here's my switch statement which doesn't work, if anyone is interested.
>
>switch (tim.pmode)
>  {
>  case 0 :sprite->w=tim.pw*4; /* If sprite is 4 bit, make width 4 times
>bigger */
>    break;
>  case 1 :sprite->w=tim.pw*2; /* If sprite is 8 bit, make width 2 times
>bigger */
>    break;
>  default :sprite->w=tim.pw*2; /* Else set it to width got from tim info */
>    break;
>  }
>
>