Combining RGB from one texture with alpha from another

[mateuszduda]

Hi,

I need help to discuss an issue about merging together two defferent textures - one contains RGB data and is in JPG format, another contains only information about the alpha channel and is in PNG format. We now use an approach where a canvas element is created, the we first draw the alpha texture and use "source-in" composite operation (https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/globalCompositeOperation) to draw RGB texture on top.

Due to an error with Apple devices, when creating multiple canvas elements one of them is returned as undefined. Is there any way I can combine these textures while not using a canvas?

I prepared a simple demonstration of the process here: https://playcode.io/1734929

[mateuszduda]

For next generations: I just used one canvas and rendered the content to multiple Image elements using .toDaraUrl(). iOS seems to no longer crash because of this.