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partially transparent objects


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I'm new to WebGL.


How should I handle objects that are partially transparent, but mostly non-transparent ?


Lets say that the grey area of the attached image is non-transparent and the yellow area is transparent.


Then lets say i will be rendering alot of theese images in front of eachother so that most parts of most images will be totally/mostly covered by other images.


Would there be significant performance gain if I split the image in two parts.

The lower part which I know is non-transparent (and possibly flag that part as totally non-transparent somehow) and the upper part where there are transparent areas, or will that be done automagically for me by pixi / webGL / gfx card ?


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