Sega Tween

Thursday, 1st February 2007

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;

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:

.rept 9000
	ld a,1
	ld a,2

...produces this in old Brass:

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

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

Brass Assembler - Copyright © Bee Development 2005-2007
ZiLOG Z80 - Copyright © Bee Development 2005-2006
TI Program Files - Copyright © Bee Development 2005-2006
Core Plugins - Copyright © Bee Development 2005-2006

Parsing source...
Writing output...
Time taken: 484.38ms.

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

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