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# Sega Tween

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No updates for a while, I'm afraid - things have been pretty hectic.

I packaged up and released the Sega Tween demo I'd been working on. As you can see, I added an SMS and a 3D mode - this works with the SMS 3D glasses. The extra 3D is quite cheap to calculate - shift the rotated X coordinates one way for one eye, then the other way for the other eye. After projection to the screen they need to be shifted back a little way to re-centre, but it works quite well.

However, I had neglected the fact that the SMS1 (which has the card slot, and hence the model that supports the 3D glasses) had a bug in the VDP and as such only supports four zoomed sprites per scanline. I added this glitch to the emulator;

Click for animated GIF

In other news, I've done a small amount of work on Brass. It's quite embarrassing, really, how slow the old version is. Assembling this file:

Quote:
 .rept 9000 ld a,1.unsquish ld a,2.squish ret.loop

...produces this in old Brass:

Quote:
 Brass Z80 Assembler 1.0.4.9 - Ben Ryves 2005-2006-------------------------------------------------Assembling...Pass 1 complete. (2093ms).Pass 2 complete. (22062ms).Writing output file...Errors: 0, Warnings: 0.Done!

Nearly half a minute! New Brass does a much better job of syntax parsing and caching...

Quote:
 Brass Assembler - Copyright (C) Bee Development 2005-2007-------------------------------------------------------ZiLOG Z80 - Copyright (C) Bee Development 2005-2006TI Program Files - Copyright (C) Bee Development 2005-2006Core Plugins - Copyright (C) Bee Development 2005-2006Parsing source...Building...Writing output...Time taken: 484.38ms.Done!

Down to just under half a second. That's almost a 50x speed increase!

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