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[MonoGame] BlendState confusion

eprime

Hi,
the blendstate of a GraphicDevice can be:

BlendState.Additive
BlendState.AlphaBlend
BlendState.NonPremultiplied
BlendState.Opaque

instead the Spine Monogame runtime use:ù
BlendMode.Additive
BlendMode.Normal
BlendMode.Multiply
BlendMode.Screen

this can be confromed to real GraphicDevice Blend State?
there is a bug in row 157.
it handle only Additive and AlphaBlend mode, If I set NonPremultyplied or Opaque is replaced by the default state that is AlphaBlend

and... I can not use a custom blend state

Harald

eprime लिखा
it handle only Additive and AlphaBlend mode, If I set NonPremultyplied or Opaque is replaced by the default state that is AlphaBlend

This is intentional, a previously set blend state will be overridden accordingly. Using BlendState.NonPremultyplied or BlendState.AlphaBlend is chosen depending on PremultipliedAlpha, see line 88. Using BlendState.Opaque is likely not something that you want since you would lose all transparency and have it render black instead (or you would need to add alpha testing to your fx file, which still leads to jagged edges).

eprime

Ok now i got it right!
Please can you add the BlendType Multiply? It is the only one that is missing and is used a lot

blend.ColorBlendFunction = BlendFunction.Max;
blend.ColorSourceBlend = Blend.DestinationColor;
blend.ColorDestinationBlend = Blend.Zero;

Harald

We have just pushed a commit to the 4.2-beta branch which adds support for blend mode multply. Could you please let us know whether this works as desired?

eprime

Harald your code works perfectly
NUMBER ONE!

Harald

Thanks for testing and for your kind words! 🙂 Glad to hear it's working as desired.