OpenEuphoria

Re: Exotica, DirectX & Neil

• Posted by Pete Eberlein <xseal at HARBORSIDE.COM> Sep 15, 1999
• 353 views

David Guy wrote:
>Hi,
>
>As of DX 6.1, DirectDraw provides no means of blending two images/surfaces
>in any way (other then simple color keying), though I belive, such
>capablities are included in DX 7.0 (I may be mistaken.)
>
>If you want to have DX <= 6.1 blend images, you have to use Direct3D: Setup
>one or both images as textures, and then blend away!
>
>Hope this helps,
>David

and David Cuny wrote:
>I don't know about DirectX, but the rest of the world calls it alpha
>blending.
>
>-- David Cuny

Okay, thanks for the advice Davids!

Neil2 won't use directx to do the blending - it will have it's own machine
code routines that do it fast.  That way it will work on non WIN32
platforms: DOS32 and Linux.

So how about:
"alpha_blit" means blend two images at 50% (or average them)
"blend_blit" means add two images (and saturate)

This naming scheme is currently reversed from the way I have it now. 

The new blending routines will have a version for rectangular images and a
version for rle sprites.

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