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Naruto-kun

Alpha blending

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Hi guys

 

I have a project where i need to blend multiple images into one and after numerous attempts with GDI+ and Direct2D(which were either too slow or used pre multiplied alpha) i finally decided to do my own alpha blending system with D3D.

 

I found this topic: http://www.gamedev.net/topic/34688-alpha-blend-formula/

 

Its pretty much just what i need however I need to know which of the pixels would be "on top" so to speak in the layer. So which would it be? src or dest?

 

Thanks

JB

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src is the output of your pixel shader, and dest is what's already in the surface you're rendering to.

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