Using DrawUserPrimitives with Xelmish about xelmish HOT 3 CLOSED

I feel like this bit is likely inefficient:

        drawables
        |> List.iter (fun drawable ->
            match drawable with
            | Sprite df ->
                spriteBatch.Begin (sortMode = SpriteSortMode.Immediate)
                df assets inputs spriteBatch
                spriteBatch.End ()

If you have a hundred sprites would it not start and stop the batch a 100 times?

In any event, good work! But vertex-based drawing, user primitives etc is slightly outside my vision for Xelmish, as it would allow 3D models etc. I feel like supporting it and all the custom configuration would be just easier with a raw monogame project than through Xelmish's abstractions. But I will see about making it not internal (maybe breaking out some of the steps of draw/update so they can be overwritten, etc).

When I draw hex grids with it, I just use a sprite for each hex and draw that just like with other sprites. You could give that a try, or stick with your approach which looks neat :)

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You might find the tutorials by catlike coding interesting: https://catlikecoding.com/unity/tutorials/hex-map/ Its in unity, and c# (I did a full implementation of it here) but its also entirely vertex based, so in theory could be done in Monogame.

Or, if you wanted to use Unity but stick with F#, I did a small project on doing F# with unity here that has some setup/process instructions that might be useful.

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Yeah that is a good point about it being inefficient. I added the batch type to try and account for that sort of thing but that has a bit more overhead, so its a trade off.

I will probably need to either add or replace this with texture drawing at some point but I did it this way to understand the hex stuff a bit better. (I had tried it with textures first but it wasn't working, turned out I had a bug with the hex to pixel function but I didn't find that until after I switched)

Thanks for taking a look at this and for making Xelmish in the first place, its pretty cool!

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