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Dr. Jay
Account closed
Registered: Jan 2003
Posts: 32 |
FPP - flexible pixel position
Anyone have a commented source example?
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chatGPZ
Registered: Dec 2001
Posts: 11114 |
you're welcome =D |
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ChristopherJam
Registered: Aug 2004
Posts: 1378 |
"Helping" |
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Oswald
Registered: Apr 2002
Posts: 5017 |
my bad so its reading and all that :)
"Also only use every 2nd screen. This way you'll avoid also having to skip 5 chars in the middle of a charset. And you only need 6 screens if you don't use charpacked gfx."
I dont get this, why halve the nr of possible rows when it fits into the charset anyway? why only 6 screen ? thats 6 rows max ? |
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Krill
Registered: Apr 2002
Posts: 2839 |
6 * 40 = 240, you cannot put more than 6 full char rows with unique characters into a charset. |
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Oswald
Registered: Apr 2002
Posts: 5017 |
that clears it up, now I remember why my chessboard fpp shit in Soiled was 32 wide =) |
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xIII
Registered: Nov 2008
Posts: 210 |
Thanks all for the replies! |
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Cruzer
Registered: Dec 2001
Posts: 1048 |
Sorry, I should have said "You only need 6 screens if your gfx is 40 chars wide and isn't charpacked." Of course you can use all 16 screens in other cases, but I was just trying to make it as simple as possible. |
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xIII
Registered: Nov 2008
Posts: 210 |
After all the replies I managed to code the FPP routine but I came across a new problem. I hope to get some more support in here :)
I copied the bytes of the original charset in the correct positions with this routine:
Setup_Charset: .for (var x=0;x<251;x++){
lda charset+0+x*8
sta screen0+0+x*8 // screen0 = $4028
lda charset+1+x*8
sta screen1+0+x*8 // screen1 = $4828
lda charset+2+x*8
sta screen2+0+x*8 // ...
lda charset+3+x*8
sta screen3+0+x*8
lda charset+4+x*8
sta screen4+0+x*8
lda charset+5+x*8
sta screen5+0+x*8
lda charset+6+x*8
sta screen6+0+x*8
lda charset+7+x*8
sta screen7+0+x*8
}
rts
The calculated charsets were saved and imported in the actual code (I'm sure there's a better way). The first 5 chars of every charset were used for screendata.
When I start the fpp routine it shows the first 34 chars correct but the final 6 chars are scrambled.
I have tried some things but cannot figure out what is going wrong. If you want to see the actual code, pm me. |
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Cruzer
Registered: Dec 2001
Posts: 1048 |
Looks like it would work, even though it's some of the most bloated code I've ever seen. :)
Your problem might be with the char setup or the FPP routine itself. Maybe the first badline is triggered at an odd position, causing the screen to be VSP'ed some chars. The possibilities are plenty. Trial'n'error your way forward. Look at the generated data in an MC-monitor. Try adding/removing nops. This is how we all spend most of our coding time. Things almost never work the first time. |
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hollowman
Registered: Dec 2001
Posts: 474 |
To verify your fpp data you can try using fpp-converter and compare it to your data, and you can test your data with its routine (it is using 16 screens so you cant use chars $00-$04 or $80-$84)
And for the charset and screen you can try convert studio where you can convert bitmap to charset+screen and select the characters that may not be used in the charset. |
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