Can we exposed the mutable referance of CommandEncoder in RenderPass?

[Ahuang0107]

Below is an example of what I'm trying to do.
In some cases, I hope to call command_encoder's copy_texture_to_texture once between processing instance A and instance B after creating render_pass. But it's currently not possible because RenderPass holds a mutable reference to CommandEncoder. If we can exposed RenderPass.parent, the following code can run.

(ps: of course, in the following example, I can modify it to create a separate pass when processing each instance, but I actually encountered this problem when using bevy. it will be much simple to do some adjust in wgpu)

[grovesNL]

Hi! 👋 Usually the pattern is that you perform any copies or anything that needs exclusive access to the render pass before you start the render pass. So you could have a separate loop before let mut render_pass that performs all of the copies.

[Ahuang0107]

thanks for reply, you are right, i try to build wgpu my self and exposed &mut CommandEncoder, it does not run as a i expected. i need to do copies before render pass.