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Slow Scrolling Background

Started by TabriS Apr 21, 2000 at 12:10 PM 4 replies 550+ views

Original Post

Apr 21, 2000 at 12:10 PM

Hi all I''m new user. My name is TabriS. nice to meet you all.. Now, I''m developing 2Dshoot ''em up game and I''ve trouble with a background. It so large (about 520x430). When I Blt it to backbuffer it slow down my game! How to optimize it? ( my game work in 640x480x256 mode )

revolver

Apr 21, 2000 at 1:05 PM

Try loading it once, then using dirty rectangles when drawing.

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SHilbert

Apr 21, 2000 at 1:25 PM

Two other possibilities:
1.Write your own blitter. (You could probably get help with this on this messageboard.)
2. DON''T RELY ON THE CLIPPER FOR SCROLLING. Restrict the rectangular areas drawn to those onscreen.

TabriS

Apr 21, 2000 at 1:33 PM

to SHilbert:

1. Use function like memcpy()?
2. Yes, I''ve attached Clipper with BackSurface. Is it slow down my game?

daveb

Apr 21, 2000 at 1:41 PM

There''s no reason it should be so slow. Using DirectDraw''s Blt capabilities or using a 3d card to draw sprites as textures should result in blinding framerates.

How are you physically drawing the bitmap?

SHilbert

Apr 21, 2000 at 3:19 PM

TabriS:

1. Yes. That''s one way.
2. The clipper doesn''t slow it down, but it might be faster if you define the RECT''s you pass to Blt() not to extend offscreen... that way the clipper doesn''t have to do any work.

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