Games with pixel screen scrolling?
Moderator: Moderators
Games with pixel screen scrolling?
can you name VIC-20 games that use screen scrolling at the pixel level (VIC's screen-offset registers).
I can only think of one: Salmon Run.
Any other?
P.S. howdy to the forum! it's a long time I've been away from here
I can only think of one: Salmon Run.
Any other?
P.S. howdy to the forum! it's a long time I've been away from here
Re: Games with pixel screen scrolling?
note sure about original games from the 80s
some contemporary games come to mind..
Cheese & Onion
Pulse
Victragics Kickstart (1/2 char)
some contemporary games come to mind..
Cheese & Onion
Pulse
Victragics Kickstart (1/2 char)
Re: Games with pixel screen scrolling?
There are quite a few from the 80s. While their scrolling bg often is rather sparse and only a small part of the screen, they are very often part of a parallax effect.
Quadrant (1983). Unexpanded Moon Patrol clone. Lower layer/row moves at 4 pixels/step, middle layer at 2 pixles, upper layer 1 pixel.
Moon Patrol (1983). Two layers.
Choplifter (1982). Tanks scroll faster than houses & hostages. Also a nice parallax effect at the crossing of the border.
Jungle Hunt (1983). Overlaying parallax in the sea/river level! The faster layer moves at 4 pixels, the slower at 2 pixels.
Spiders Of Mars (1982). Super smooth 'wireframe' mountains. 50/60 fps?
Regarding contemporary games. Let's not forget Misfits' precursor to Cheese & Onion - Super Starship Space Attack. Full screen vertical scrolling with nice parallax effect.
Quadrant (1983). Unexpanded Moon Patrol clone. Lower layer/row moves at 4 pixels/step, middle layer at 2 pixles, upper layer 1 pixel.
Moon Patrol (1983). Two layers.
Choplifter (1982). Tanks scroll faster than houses & hostages. Also a nice parallax effect at the crossing of the border.
Jungle Hunt (1983). Overlaying parallax in the sea/river level! The faster layer moves at 4 pixels, the slower at 2 pixels.
Spiders Of Mars (1982). Super smooth 'wireframe' mountains. 50/60 fps?
Regarding contemporary games. Let's not forget Misfits' precursor to Cheese & Onion - Super Starship Space Attack. Full screen vertical scrolling with nice parallax effect.
Last edited by hasseapa on Sun Feb 10, 2019 3:52 am, edited 1 time in total.
- Ola H
- Vic 20 Enthusiast
- Posts: 173
- Joined: Thu Aug 20, 2015 6:08 pm
- Website: http://www.athleticdesign.se/
- Location: Sweden
Re: Games with pixel screen scrolling?
Polaris (1983)
-
- Vic 20 Devotee
- Posts: 231
- Joined: Tue Sep 04, 2018 2:40 am
- Website: http://davbucci.chez-alice.fr
- Location: Grenoble - France
Re: Games with pixel screen scrolling?
I tried to achieve a sub-char vertical screen scrolling in my Cavern Explorer (2018):
http://sleepingelephant.com/ipw-web/bul ... 2&p=102571
I'm not fully satisfied of it, I think the code can be made more efficient, but it works reasonably well.
http://sleepingelephant.com/ipw-web/bul ... 2&p=102571
I'm not fully satisfied of it, I think the code can be made more efficient, but it works reasonably well.
Re: Games with pixel screen scrolling?
very nice game! I was just thinking of making a game like thisDarwinNE wrote:I tried to achieve a sub-char vertical screen scrolling in my Cavern Explorer (2018):
-
- Vic 20 Devotee
- Posts: 231
- Joined: Tue Sep 04, 2018 2:40 am
- Website: http://davbucci.chez-alice.fr
- Location: Grenoble - France
Re: Games with pixel screen scrolling?
Thank you!nippur72 wrote:very nice game! I was just thinking of making a game like this
Last edited by DarwinNE on Thu Mar 28, 2019 3:02 am, edited 1 time in total.
- pixel
- Vic 20 Scientist
- Posts: 1361
- Joined: Fri Feb 28, 2014 3:56 am
- Website: http://hugbox.org/
- Location: Berlin, Germany
- Occupation: Pan–galactic shaman
Re: Games with pixel screen scrolling?
Not quite. It's actually recalculating the charset for each frame, thus making things much more straightforward.beamrider wrote:Pulse
A man without talent or ambition is most easily pleased. Others set his path and he is content.
https://github.com/SvenMichaelKlose
https://github.com/SvenMichaelKlose
Re: Games with pixel screen scrolling?
Skyhawk even if i think it's 2 pixel scrolling
No one should tolerate death and violence because tolerance will generate habit.
Re: Games with pixel screen scrolling?
I've just discovered "Mountain King".
https://www.youtube.com/watch?v=tAItz1ig6B0
I thought Cheese & Onion was the only game to have 4-way smooth scrolling, but this seems to have it as well, albeit with a more repetitious background.
In addition It also has a fixed panel at the bottom which misfit said he found too difficult to do in C&O.
https://www.youtube.com/watch?v=tAItz1ig6B0
I thought Cheese & Onion was the only game to have 4-way smooth scrolling, but this seems to have it as well, albeit with a more repetitious background.
In addition It also has a fixed panel at the bottom which misfit said he found too difficult to do in C&O.
Re: Games with pixel screen scrolling?
Intrigued, I did a bit of digging.
Mountain King doesn't appear to be update the HSCROLLPOS register @ $9000 so I am guessing it's shifting a few defined pairs of characters to achieve the fine scrolling illusion. As can be seen here, this works well on a repeating/constrained background, but not to well for arbitrary graphics IME.
MK does update $9001 for the much simpler vertical scrolling. I'm guessing that the static potion at the bottom is re-rendered at the pixel level on every change of vertical position otherwise I've found that it judders up and down, since $9001 is latched during the fly-back, and any changes during raster splits have no effect.
Mountain King doesn't appear to be update the HSCROLLPOS register @ $9000 so I am guessing it's shifting a few defined pairs of characters to achieve the fine scrolling illusion. As can be seen here, this works well on a repeating/constrained background, but not to well for arbitrary graphics IME.
MK does update $9001 for the much simpler vertical scrolling. I'm guessing that the static potion at the bottom is re-rendered at the pixel level on every change of vertical position otherwise I've found that it judders up and down, since $9001 is latched during the fly-back, and any changes during raster splits have no effect.
Re: Games with pixel screen scrolling?
that's strange, how can you use shifting when you have different colors without color clash? (e.g. the cyan stairs and the red ground). To me it seems $9000 horizontal scrolling at work. Is it moving 1-pixel steps or two? (I'm unable to step frame by frame in youtube)beamrider wrote: ↑Sat Jun 20, 2020 6:12 am Mountain King doesn't appear to be update the HSCROLLPOS register @ $9000 so I am guessing it's shifting a few defined pairs of characters to achieve the fine scrolling illusion. As can be seen here, this works well on a repeating/constrained background, but not to well for arbitrary graphics IME.
Re: Games with pixel screen scrolling?
I put a watch on $9000 in VICE and it never fired.
Re: Games with pixel screen scrolling?
you are absolutely right. $9000 isn't touched at all, and if you force $9005 to $ff you see how only certain tiles are moved/shifted. The cyan stair and red ground I guess it's done with multicolor.
Very very remarkable!
Re: Games with pixel screen scrolling?
So you can - even more so if you slow it down to 10%.
As I already mentioned, you can now see that the bottom static area has unwanted vertical juddering when it scrolls up/down, so they must be offsetting the rendered text characters to compensate.
As I already mentioned, you can now see that the bottom static area has unwanted vertical juddering when it scrolls up/down, so they must be offsetting the rendered text characters to compensate.