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Forums > C64 Coding > Sine sprites in the sideborder. VSP garbage and more

2018-01-22 11:35

Golara
Account closed

Registered: Jan 2018
Posts: 212

Sine sprites in the sideborder. VSP garbage and more

Hello everyone. I'm working on my first C64 demo / intro. I managed to open the sideborder at the top and obviously I immediately put some X-sinus sprites there (I'm still trying to figure out how a DYSP works, right know i have opened lines with 0 and 8 sprites). I noticed that the positioning of the sprites on the X axis is a bit weird. Position 0 is slighty on the left border, but if you want to go all the way to the left you have to use X 500 or there about. My question is, is there some sinus maker or converter that would take care of this ? (so it goes from 0 to ~500 looking like smooth movement to the left). Another question, what is the good way of handling the 9th bit of X position ? What I do is generate a 256 words sinus with values 0 to 500 and use c++ program to split that into 2 256 bytes tables like

sin_1:
1,2,3,4,5,6,7,55,33,....
sin_2:
1,0,0,0,0,1,0,0,1.... where 1 means to set the bit and 0 to not do that.
My sprite 0 is bugging out in the right most border while other sprites display just fine. Why is that ? I've read somewhere that sprite 0 is evil, but could not find any details on why.

I also do VSP by turning on the screen at the right moment together with XSCROLL for smooth scrolling. I see few pixel lines of garbage just above the image, I cover that with the illegal screen mode, disable it at line 56. Is that a good idea ? Another thing about VSP is that it seems to move the whole screen down by one char on the scrolled side (makes sence I guess, as the part of the chars that are outside of the image are displayed on the next text line). So should I copy the 25 lines of graphics in each column when scrolling for seamless scroll or do people not do that ?

Here's a picture of what it looks right know. A big mess !
(PETSCII picture by Archmage as a placeholder. I can't find any pics in binary and that was the easiest to take out of a compiled prg) Hope you have the patience to help a lamer out.
https://i.imgur.com/byWFRsH.jpg[/url]

HughJass from Poland

... 55 posts hidden. Click here to view all posts....

2018-01-27 13:17

Golara
Account closed

Registered: Jan 2018
Posts: 212

Quote: Hujas? The bug looks like you are off with $d010 table.

yeah it seems like it, but if I use a sinus with smaller steps there's no bug, even on the same position. Code is the same I only change the table... Oh well, I'll figure it out eventually, I'll start on some other effect. Btw. What would I have to do to consider it a crack intro ? does it have to relocatable or ?

EDIT. Hugh Jass is pronouced like Huge Ass, that's the epic joke.

EDIT2. I just fixed it, no more bugs :D
EDIT3. I've tried to expand this tech-tech into the left border, but because of this 8 pixels gap I find it impossible (no cycles left to check and do adc #8) Unless I reduce the number of sprites (6 right now.) I guess i'll leave it as is right now.

2018-01-27 23:36

Golara
Account closed

Registered: Jan 2018
Posts: 212

Alright, I'll try to make it the last picture, I want to suprice you all ;) Last couple of questions

1. Where can I find some sprite fonts ? I remember I had one from csdb (I didn't use it for C64 though) and I can not find it.... I've found lots of char fonts, but not sprite ones.

2. How to chose good colors for flashing, color bars etc. I have the worst case of coder colors, is there any guide on that ?

3. Where can I get some C64 pictures (chars or bitmap) ? Obviously there's a great selection on csdb but these are all compiled prgs. Do I have no choise but to just disassemble them ? (I did that with one petscii picture, but that was easy...)

4. About credit... Is it fine for me to use random graphics or sid or should I ask the author ? I don't intend on sending this to any compo, just to release it on csdb. Of course the credits will be in the demo

5. Greetings. As someone new who has no contacts with anyone is it fine for me to greet all the damn elite of C64 ? haha. I find it kinda silly, but I'd like to mention the groups I like, I don't know how that works....

I'm not embeding the gif cuz it's almost 10mb, so to not slow down the loading of this page, click the link bellow

(these colors, that font, it hurts!)
https://i.imgur.com/zjvrQbw.png[/url]

2018-01-28 00:27

Mixer

Registered: Apr 2008
Posts: 452

Nowadays it is simple to convert any font or other graphics from PC using Python scripts or converter applications. Ask around, perhaps some artist will do some pixeling.

2018-01-28 10:52

Golara
Account closed

Registered: Jan 2018
Posts: 212

Quote: Nowadays it is simple to convert any font or other graphics from PC using Python scripts or converter applications. Ask around, perhaps some artist will do some pixeling.

Oh damn, why did I not think of that... Yeah, I just converted a PC font, looks very nice.

2018-01-28 11:47

Oswald

Registered: Apr 2002
Posts: 5094

btw how do you create these nice gifs?

2018-01-28 12:01

Golara
Account closed

Registered: Jan 2018
Posts: 212

Quote: btw how do you create these nice gifs?

It's this program. https://github.com/NickeManarin/ScreenToGif/releases/download/2..

Works like a normal screen recording software, but saves the video as gif or other animated formats. I actually posted .apng here because their size is much smaller than the old .gif

After recording you can view all the frames, so the last few animations i posted i actually took care to remove the excess frames to make it wrap seamless. It has a nice editor for that. It's a great program and it's less than 1MB

2018-01-28 13:44

Golara
Account closed

Registered: Jan 2018
Posts: 212

2018-01-28 18:40

Golara
Account closed

Registered: Jan 2018
Posts: 212

What do you guys think ?
https://i.imgur.com/NQ8Bkgk.mp4[/url]
I still have about 180 lines of raster time (with bad lines) free, so i'll put something nice on the screen yet. The graphic will be replaced with some nice bitmap, since it's VSP movement, overkill for just PETSCII. I also decided to do some design, not just an intro, so this is a screen you'll see after some time, it has to build up somehow... I have couple of ideas already.

2018-01-28 18:53

Oswald

Registered: Apr 2002
Posts: 5094

nice stuff, I'd double/triple the sine frequency to make it look more pleasing, and a nice multicolor logo wouldnt hurt either :)

2018-01-28 19:05

Golara
Account closed

Registered: Jan 2018
Posts: 212

Quote: nice stuff, I'd double/triple the sine frequency to make it look more pleasing, and a nice multicolor logo wouldnt hurt either :)

Yep, definitely a multi color logo would look better, but it's harder to get one, this is just some PC font converted to sprites.. Right now I have 4 sinus tables, but maybe i'll add more, we'll see how good i'm on memory. Right know i'm almost at 16kb

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