[SDL] Does "Alpha" channel blend blitting work on ALL platforms ???

[Sam Lantinga]

> I wish to have screens in my next game that:
> 1. fade from black to rendered screen
> 2. fade from rendered screen to black

> Blitting a black sprite the size of the screen over the pre rendered screen
> with varying levels of alpha enabled should do the trick.

> My question to the S.D.L.(R) game making experts is:
> does "Alpha" channel blend blitting work on ALL platforms?

Yes, it does.

> Another question is are would the above technique be C.P.U. intensive 
> and very expensive?

Yes, it is.

You might also try gamma fading, which is faster when supported, but isn't
supported on all platforms and drivers.

> P.S. - "S.D.L.(R) Rocks!"

Thanks! :)

See ya,
	-Sam Lantinga, Lead Software Engineer, Blizzard Entertainment