Plot and Flickering in Action!

[ivop]

What you call two display memories, is more generally called double buffering and page flipping. With this method, at the end of clearing and drawing your buffer, you are always waiting for a vertical blank, which wastes precious cycles.

 

There's also triple buffering. Start with all buffers clear.

 

Buffer 1 is displayed, buffer 3 is cleared, buffer 2 is drawn to, when done do not wait for vblank but start drawing to buffer 3, at vblank flip to buffer 2.

Buffer 2 is displayed, buffer 1 is cleared, buffer 3 is drawn to, when done do not wait for vblank but start drawing to buffer 1, at vblank flip to buffer 3.

Buffer 3 is diaplayed, buffer 2 is cleared, buffer 1 is drawn to, when done do not wait for vblank but start drawing to buffer 2, at vblank flip to buffer 1.

Repeat.

 

Edit: This way you are never unnecessarily waiting for a vertical blank.

 

Edited November 22, 2020 by ivop

[777ismyname]

There is an alternative and faster graphics library (at least partial library), but I’m having trouble locating it at the moment; someone liked the laptop that I had most of my stuff on more than I dude

 

This and similar articles are up at AtariWiki that may help >>>
 

https://atariwiki.org/wiki/Wiki.jsp?page=Fast Screen IO