3 channel formats for WebGPU are not supported since they are often implemented as 4 channel formats in hardware. But it’s not convenient for developers to convert the RGB images to RGBA such as jpeg images only contains 3 channels. Developers may have to use a third party lib to convert format for them.

Questions:

1. Will WebGPU support 3 channel formats or leave the conversion to developers?

2. Analysis which formats are portable?