GPUTexture objects are returned with “null” native Metal textures backing them when the “usage” flag is not set correctly. For example, you can set usage to 0 or a random number and a GPUTexture will still be returned by device.createTexture(…). This texture is also able to create a GPUTextureView.

Unfortunately after that many internal errors may happen that can be very tricky to debug for application developers. 

For example if we always return a null GPUTexture with no Metal texture backing it:

Ref<WebGPUTexture> WebGPUDevice::createTexture(const GPUTextureDescriptor& descriptor) const
{
    auto texture = m_device->tryCreateTexture(descriptor);
    return WebGPUTexture::create(nullptr);
}

The tests under LayoutTests/webgpu/textures-textureviews.html will still all pass.