Rendering to Layered Texture using Subpasses?

Vulkan
1

Hi,

I want to render to a cubemap without using the geometry shader for layer selection.

I have read that subpasses might be helpful but I would need to configure the subpass attachments to select the proper layer.

But I have only very limited knowledge about the entire proceedings.

As I understand the dependencies:

I create a commandbuffer using a renderpass and framebuffer

the framebuffer knows about the same renderpass AND about the view to the render target

the view and the framebuffer contain knowledge about a layer count

the views image shoul contain the same number of layers

The view also allows me to select a baseArrayLayer to which I can write.

Now, I would have hoped to find som layer correspondece during subpass creation, but I fail to see any connection.

I hope for some help and explanation or a statement on whether what I try to do makes sense.
Best Regards

2

I want to render to a cubemap without using the geometry shader for layer selection.

You can’t. Only the GS can select a layer.

I have read that subpasses might be helpful

They won’t. While you could provide several layers as color attachments (by making separate a image view for each layer) and use different layers in different subpasses, that’s not layered rendering. You would be limited by the number of color attachments you can use.

3

Thank you for that definitive answer

4

To clarify, how would I render to the individual cube faces.

Do I need 6 pipelines? 6 attachments? 6 renderpasses? 6 framebuffers?

Best Regards