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  1. Thanks for the good explanatory answer Appreciate it
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  2. blend_modes are: 1. porter-duff basic equations: NORMAL, ADD, SCREEN 2. composition modes , ERASE (aka DST_OUT) and all other composition modes are supported in webgl: https://pixijs.io/examples/#/plugin-picture/blend-modes.js , because they can be porter-duffed. 3. exception is SRC_IN, DST_IN work with external part of image - so they require full screen geometry - we cant do them. 4. modes that work with non-premultiplied colors and difficult formulas - OVERLAY, HARD_LIGHT and real MULTIPLY (that cares about transparency) aren't supported, but can be emulated via texCop
    1 point
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