Date   : Mon, 23 Sep 2002 14:57:43 +0000
From   : "Tom Walker" <tommowalker@...>
Subject: Re: rupture technique

>In any case, I believe the rupture technique is the name for tricking the 
>video address counter to reload mid-frame, which is a simple case of 
>persuading the CRTC to enter and exit vertical sync within a few scanlines, 
>arbitrarily placed within the display.

Indeed you are correct. Uridium uses rupture btw, should anyone want to see 
the technique in action.

>By the way, something which I've always thought would be interesting would 
>be to use this technique to program a new start address every line (or 
>every other if timing conditions require) in order to make a Wolfenstein 
>type display on the side. You'd almost certainly not be able to do the ray 
>cast once per frame with all that going on, but you'd be in the region of 
>5-10fps, surely?

Luckily enough, there is a technique similar to rupture that does exactly 
that, forcing a reload of the start address every fame.

As for speed, I reckon that a textureless mode 8 raycaster using the above 
technique should run reasonably.

Tom

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