Blitz (50/119)

From:Thilo Köhler
Date:17 Jun 2001 at 22:37:03
Subject:Re: RTG

Hello Mark !

On 18-Jun-01, you wrote:

> I'm trying to convert a Blitz program of mine to run on graphics cards.
Its not so easy. I have the same problem porting the game "Toadies"
to graphics cards. I thought about replacing every single Blitz
command into a system friendly one and that`s it. But due to very different
performance of the single operations it is not possible. Forget copperlists,

smooth scrolling and tricks with bitplanes. Everything that runns in
blitzmode-only is not possible (including BBlit).
Also BitmapToWindow is very slow and not suitable or quick drawings.
Best method is to keep everything that is possible in a bitmap allocated in
the graphics card memory.
Things like fading is also a bit tricky, because you can not rely on that
your screen is colour mapped like AGA screens. Fades on hi/true color
screens means to recalculate the whole picture which is not possible
on ZII cards in acceptable framerates.
But if you find some solutions for games on graphics cards, it would
be interessting for me.

Ciao,

Thilo

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