alpha blits | GameDev.net

Original Post

Mar 6, 2000 at 5:30 AM

It seems that 2d blitting in directdraw doesnt contain any alpha blending support. Does anyone know how i can implement this efficiently or can point me to some articles that deal with this sort of thing? i could use d3d but i need the 2d images to be any size possible and also use font images.

Matthew Allen

Mar 6, 2000 at 9:00 AM

Alpha blending in software (not D3D) will be extremely slow because it must take place in system memory. Exceptions: you already have your surfaces in system memory OR you have a fast AGP card. If you do have AGP, I''d suggest that you test your code on a non-AGP card. As for code/examples, there''s one here on gamedev (it was one of the first featured articles) and there are a couple on tune-it.com

- mallen22@concentric.net
- http://www.cfxweb.net/mxf/

mcfc98

Author

mcfc98

Mar 10, 2000 at 6:11 AM

Ive done it in d3d now but thanks all the same.

Melo

Mar 13, 2000 at 12:38 PM

The posts above did not mention this Article...

Melo

Mar 14, 2000 at 10:05 AM

Whoops - it was mentioned. But well, who cares

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