The addImageAsync logic follow the steps: - find the image has been add or not, if not add an AsyncStruct to _requestQueue (GL thread) - get AsyncStruct from _requestQueue, load res and fill image data to AsyncStruct.image, then add AsyncStruct to _responseQueue (Load thread) - on schedule callback, get AsyncStruct from _responseQueue, convert image to texture, then delete AsyncStruct (GL thre
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