How can I create a custom pass (denoiser etc.)

[uselessgoddess]

I would like to upload swapchain_image to the cpu side to run the denoiser, but I can't do it. I was trying to add this functionality to ray_render_plugin.rs but I still could not fix lot of errors due to incorrect transition_image_layout. Could you help me with this?
I'm not very good at Vulkan API, maybe there is some simple way to do this?

[HugoPeters1024]

Hey! Thanks for showing interest in my hobby project! I'm assuming you are using the vkCmdCopyImage command? I think the best way to achieve what you want to take the frame.render_frame_buffer.main image after the raytracing has completed. Which is just before this command. At this point you don't have to do any layout transition, as the main render buffer is already in the GENERAL layout, which is required for the call to vkCmdCopyImage. The only caveat is that that buffer contains the accumulated values, with the number of samples stored in the alpha channel. If you want the linear color data you'll have calculate vec3 linearRgb = mainImage.rgb / mainImage.z.

Alternatively you could write a copying compute shader that also does the calculation I just described.

I hope that helps! Vulkan is a complicated beast but very consistent and well specified.

[uselessgoddess]

Thanks for the reply and the starting point!
I will definitely try this and will continue to explore Vulkan further