CU Amiga Super CD-ROM 17/CU Amiga Magazine's Super CD-ROM 17 (1997)(EMAP Images)(GB)[!][issue 1997-12].iso/CUCD/Programming/AMOSList/AMOSLIST.0997/[e-mail]_Tue Sep 30 01:54:23 1997.msg

Text File | 1997-10-01 | 3KB | 70 lines

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From: Richard Griffith <[e-mail]>
Reply-To: Richard Griffith <[e-mail]>
To: AMOS mailing list <[e-mail]>
Date: Mon, 29 Sep 1997 23:36:21 +0500
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X-Mailer: YAM 1.3.4 [040] - Amiga Mailer by Marcel Beck
Organization: Lacking; Does not play well with others.
Subject: Re: Hello People - Cars and Colours
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On 29-Sep-97, [r]FoX wrote:
>Hi all,

>i try to make a little Game with 2 little cars (32x32,16c) to run on
>an 800x600,32,Lowres Screen.
>First i rendered the Bobs with a Retracer in 16 Images for a full rotation.
>I put them with the ObjectEd to a Bank.
>I converted them to 16 colours (cause Bob 1 use 1-8 and Bob 2 use 9-16 )
>Now i have my Bob Palette with 16 colours, so evry Bob can use 8 of them.
>And thats my Problem....i cannot handle that.
>I try to use the mask for Bob 1+2 with digits (%11111111, %1111111100000000)

The the pick-plane mask uses one bit for each bit plane,
not for each pallet color. That is to use the bottom three
planes (for 8 colors) would be %111 not %11111111. The first
value you mention would be for a 256 color screen. The second
is for over 64,000 colors. (I wish!!)

Also, if the car bobs are 16 color, and only use 8 each,
rendering them has already created data for 4 bit planes.
Depending on the color assignments, there may or may not be
any unused planes in the images. The pick planes for the
blitter will only determine if they go to the bottom 4 (lowest
16 colors), top 4 (every other color) planes, or some other
combination (like top 2 and bottom 2 for example). One bit
from each plane combines to form the color index for that
screen pixel. A 32 color screen has 5 planes.

One easy way to solve this is to render the cars to the full
screen depth, so that each will pick up its appropriate colors.
Once you get things looking right, then start converting them
to more efficient forms by reducing the bit planes on the cars.
You will need to arrange the 32 color pallette to have the
right colors in the right places. For example, if you decided
that bob2 would get its 8 colors (3 bit planes) from planes
1, 3 and 5 (%10101) it would use color indexes 0,1,4,5,16,17,
20, and 21, assuming that the unused planes were set to zero
in the blit.

Good Luck, and here's to fast cars!
-Richard