Trying to use a multiplying blendstate to get results like image editors.

[Tankerpat]

Hi ,

My english is really bad

@SenpaiSharp

Your blend state does not consider the alpha channel at all

, sorry, this :

AlphaBlendFunction = BlendFunction.Add,
AlphaDestinationBlend = Blend.Zero,
AlphaSourceBlend = Blend.DestinationAlpha,

That change nothing

Custom BlendState: How do Color- and AlphaBlend mix?

So, I am playing around with Custom BlendStates. Color Blending makes sense to me, but Alpha Blending confuses me. I don’t understand how Color- and AlphaBlend work together in a custom BlendState. Imagine the following scenario for example. You have a renderTarget (1,1,1,1) and want to cutout an opaque shape, so the affected area gets transparent. Then draw the renderTarget on top of the world. It is a specific case but crucial for understanding how that stuff works. So please stick with thi…

I can explain without writing too much in English the solution if you want.
You want to create a Multiply BlendState like Photoshop :

First you need to understand how works ColorBlendFunction :

ColorBlendFunction = BlendFunction.Add // already setting

That means : (Source * SourceBlend ) + (Destination * DestinationBlend)

If we want only multiply Source and Destination
We have : Source * Destination + Destination * Zero

So :
SourceBlend = Destination : ColorSourceBlend = Blend.DestinationColor
DestinationBlend = Zero : ColorDestinationBlend = Blend.Zero