[Coco] stuff

[Simon Jonassen]

Hey Kip !

Took a while to get it to this stage....

The chessboard itself is SG8 it's being calculated and drawn once per frame.

The routine that does the actaul drawing to the screen gets generated by the
surrounding code that calculates the board so it's constantly varying, but
it's basically like this:

ldd #$xxxx
Std 2,x
Ldd #$xxxx
Std 4,x
Rts

That routine is 16 x ldd/std - which will draw all 32 screen locations (or
64 in this case because of 1/2 char)

There are 2 of these routines - one for even pixels one for odd...

If the pixels are the same on the next line it gets called again if not it
calls the other routine

When all Y coordinates have been exhausted, it goes back and recalcs X again
with the given scale

The whole routine runs in the VSYNC with 2x poke turned on in the border
area.

The apparent "smoothness" is because it uses 1/2 sg chars (eg 4px)

/Simon :-)



-----Oprindelig meddelelse-----
Fra: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] På
vegne af Kip Koon
Sendt: 12. april 2014 05:43
Til: 'CoCoList for Color Computer Enthusiasts'
Emne: Re: [Coco] stuff

Hi Simon!
Congratulations on a very smooth moving zooming routine!  How did you do it?
Kip

-----Original Message-----
From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] On
Behalf Of Simon Jonassen
Sent: Friday, April 11, 2014 1:06 PM
To: 'CoCoList for Color Computer Enthusiasts'
Subject: [Coco] stuff

Hey guys...

been away for a while workin' on ma demo 'n' stuff...

plodding along nicely learning all the time....
 
heres a bit of my recent madness ( this is by no means finished):

https://www.youtube.com/watch?v=R7VsE503b5g

this i realtime calculated running at 50fps (or 60 for the NTSC folks)
 
amazing what the little coco II can do if you tickle her belly a bit.....
 
/Simon :-)
 

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