Jump to content
IGNORED

MWP Scrolling - The better way IMHO :)


popmilo

Recommended Posts

Hey, you were in that thread and even liked my post! :P

Well, we all move in same circles, pushing on retro code boundaries ;)

 

Compared to your code in that thread, situation is better in bitmap mode.

There are no badlines so more cycles are available anyway.

Lot's of potential here...

Link to comment
Share on other sites

Yeah, yeah, I knew you were there cuz you did those awesome graphics that inspired me to try PAL Blending in the first place, but I was just teasing you that you liked a post where I showed the Shift-F8 thing over a year ago. :P Anyhooo... looking forward to what you've got cooking. :)

  • Like 1
Link to comment
Share on other sites

Another thing, don't forget you can use the high range of HSCROL values to reduce DMA. In other words, instead of using HSCROL 0-3, use 12-15. This prevents ANTIC from halting the 6502 for several cycles at the beginning of each scan line. Hit Shift-F8 in Altirra to see the DMA pattern shrink in comparison.

 

Thank you so much, I did not know about this... and it's not often you get cycles for free!

post-16447-0-76102600-1393276902_thumb.jpg

  • Like 1
Link to comment
Share on other sites

Thank you so much, I did not know about this... and it's not often you get cycles for free!

 

Cool! You just have to remember to adjust the coarse scrolling forward by 3 bytes, but it looks like you may have already figured that out seeing as your graphics show up at the same Y position in both cases.

  • Like 1
Link to comment
Share on other sites

 

Cool! You just have to remember to adjust the coarse scrolling forward by 3 bytes, but it looks like you may have already figured that out seeing as your graphics show up at the same Y position in both cases.

 

Yes I'd added the offset and compared to what I was doing before I'm saving on average 2.5 cycles on those scan lines which is fantastic thank you.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...