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# haxe-ui
  • b
    ie, master compiles? What version of haxe?
  • m
    Yes master compiles and 4.0 2nd version stable
  • b
    im lost.
  • b
    it does compile, or it doesnt?
  • m
    It does on master.
  • m
    Not on the new branch.
  • b
    do you have an error / stack? What version of haxe?
  • f
    so if I want to have a button by graphics i need to use icon and clear the background color?
  • b
    It would probably make more sense to 
    background-image
    css property
  • b
    you can also clip, and slice-9
  • b
    Copy code
    css
#bitmapButton {
    background-image: "demo/button.png";
    background-image-clip: 0px 0px 40px 94px;
    background-image-slice: 10px 10px 30px 84px;
    border: none;
    background-color: white;
    color: #666666;
    padding-top: 10px;
    padding-left: 15px;
    padding-right: 15px;
    padding-bottom: 10px;
}

#bitmapButton .label {
    margin-top: -1px;
}

#bitmapButton:hover {
    background-image: "demo/button.png";
    background-image-clip: 0px 95px 40px 189px;
    background-image-slice: 10px 10px 30px 84px;
    border: none;
    background-color: white;
    color: #FFFFFF;
}

#bitmapButton:down {
    background-image: "demo/button.png";
    background-image-clip: 0px 190px 40px 284px;
    background-image-slice: 10px 10px 30px 84px;
    border: none;
    background-color: white;
    color: #FCFCFC;
}
  • b
    ^^ thats the image used in the css above btw
  • f
    I was trying through code, all I found was background color
  • f
    but thanks ill keep the css in mind then
  • f
    also does haxe-ui do anything for optimizations when drawn on the gpu? For example switching image with every g2 call pretty much a drag
  • b
    yeah, its pretty unoptimised for kha i think... im open to suggestions though
  • f
    all i can think of is building a runtime texture atlas as you keep loading images
  • f
    but i have little experience in optimizing ui stuff
  • b
    Images should be cached, but ill take a look at the texture atlas stuff too... dont suppose you have a pointers for that in kha do you?
  • f
    Oh texture atlas is just an image with sub images. you can use g2.drawSubImage to draw a specific region of a texture
  • f
    Images are clearly uploaded to the gpu otherwise you can't draw them. g2 however works best if you don't change shader or texture so that the vertex buffer gets filled plenty before uploading it to the gpu, so things can be drawn in one go. But with UI stuff that's a bit more complex as you can't always gaurantee draw order based on states anyways.
  • f
    I'm sure that you're using a mix of 
    fillRectangle
    and 
    drawImage
    so states are frequently swapped.
  • f
    I guess it's also far less of a problem with simple UI stuff, but something that's more graphically heavy should definitely be benchmarked.
  • f
    to be clear I don't know if your current implementation poses a problem, gpus are fairly powerful nowadays even lower end mobile gpus. It's just something I notice in terms of how assets are used.
  • b
    @bright-gpu-74537 I do this in the flixel backend
  • b
    Not sure if it’ll help to look at it wrt kha but maybe
  • b
    ok, nice... ill take a look
  • b
    👍
  • b
    It’s the optional spritesheet param, and I use it as an image source
  • f
    It would basically comes down to > load asset > render to rendertarget ( the sprite atlas) keep track of rectangle data. And then you likely want to unload the original image.
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