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Scrolling buffer in a tile engine

fatjaba · 2004-10-21T10:27:53

Hi, I have a question that hopefully someone can help me with. I have been reading about tile engines for a while now and all the articles I seem to read say blit the tiles straight to the screen, but using offsets to allow for smooth scrolling. This I understand. However, on a limited device say a pda/mobile phone this is not possible due to the limited amount of draws you can do per refresh. So what I heard you can do is make an offscreen buffer and then only draw this, so you would scroll the buffer and draw only the buffer to the screen making it much faster. However, my problem is this, say the buffer is only one tile width larger than the screen of the device, what happens when you have scrolled one tile width and you run out of buffer to update? I think i may be being stupid, but some help would really be appreciated! ------------------------- | | | |-----------------| | | | screen | | | | | | | | | | | |-----------------| | | buffer | |------------------------

General and Gameplay Programming Programming

Started by fatjaba October 19, 2004 09:48 AM

11 comments, last by Ryan Clark 19 years, 6 months ago

doynax

850

October 20, 2004 07:23 AM

Quote:Original post by fatjaba
Im still not entirely sure I understand that code, with the drawcolumn part are you not going to end up drawing a lot of columns to the buffer? or are the columns tiles of width 1?

All coodinates are specified in whole tiles, not pixels. Infact the code doesn't deal with pixels at all.
So DrawColumn(3) with a tile width of 16 draws a column of tiles at pixel 48.

fatjaba

122

Author

October 20, 2004 08:35 AM

Ahh gotcha, in that case you are my new hero. :)

Ryan Clark

212

October 21, 2004 10:27 AM

I think that this article on Scrolling with Framing Buffers might be what you're looking for!

Ryan

--Visit the Game Programming Wiki!

Scrolling buffer in a tile engine

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