How to efficiently exchange data with wayland buffers.

[laycookie]

Hello, I'm having a difficult time trying to efficiently exchange data between wgpu and wayland. In order to display an image on wayland I need to attach wl_buffer that contains the image to a surface, on there end. My issue is that I'm not exactly sure how can I create a buffer on a GPU that will be accessible by both wayland trough wl_buffer, and by wgpu trough wgpu::buffer.

In Smithay/client-toolkit there is a good example that creates a wgpu::Surface and uses it to configure and render the image, however I don't believe this is an option for me because I have to copy some data from another wl_buffer provided to me by the system. This is easily achieved by just using wl_buffer.copy(&wl_buffer) or I'm getting back to square one were I need to find a way to get data from wl_buffer to wgpu::buffer.

Wayland allows me to create a wl_buffer from dmabuf fd so if I will be able to allocate data on my gpu and get dmabuf fd my issue will essentialy be solved but I haven't found a way to export dmabuf fd from a wgpu::Buffer or even just import data to wgpu::Buffer from dmabuf fd, so I'm at a loss right now.