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Transparency

Started by Qoy Nov 22, 1999 at 5:08 PM 4 replies 900+ views

Original Post

Nov 22, 1999 at 5:08 PM

I am writing a simple game, and I am planning on using 32 bit color for it. I noticed that DirectDraw color keys can only hold 8 bit color values, so I was wondering, is there any way to use color keys with 16 or 32 bit color? If not, then how do you do transparency with 32 bit color?

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Nov 21, 1999 at 6:35 PM

I suggest you take another look at the docs. Colorkeys in DDraw are DWORDs.

Josh

Nov 21, 1999 at 7:44 PM

Hey, I can't believe I didn't notice that... Thanks for the help

Nov 22, 1999 at 9:56 AM

Direct Draw does not have built in support for alpha transparency. You'll need to write your own blitter or use Direct3D.

Nov 22, 1999 at 10:14 AM

You should read the "MMX enhanced alpha blending"-Article if you want to write your own Alpha Blitter. It is very good.

Nov 22, 1999 at 5:08 PM

He just wanted simple colorkeying... no need to look up alphablitting.

Josh

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