How to combine CommandBuffer with PassNode?

[FuXiii]

Hello I am coming again~

Before run PassNode::Execute(), you should create the image resource that it need, and after it you destroy them which it didn't need.

Combine with CommnadBuffer there has two case:

1. Each frame have one CommandBuffer, in another word each FrameGraph have one CommandBuffer
2. Each PassNode have one CommandBuffer

Before you Submit your CommandBuffer you shouldn't destroy the image resource.
So if use CommandBuffer with case 1, you shouldn't destroy the image resource after PassNode::Execute(), because the CommandBuffer will Submit until all the PassNode had executed.
So if use CommandBuffer with case 2, you should create CommandBuffer each PassNode and Submit the CommandBuffer and wait the CommandBuffer finished before destroy the resources

Which one may be elegant or reasonable？
How to combine with CommandBuffer make them reasonable?

[skaarj1989]

Hi @FuXiii

I'm sorry for the late reply (due to sickness).

Here is my advice:

• You need a transient resource system (see: #1 and #2)
• Pass your CommandBuffer to a FrameGraph (see: WorldRenderer) and use it in a pass execution lambda (like in here: TonemapPass).

[FuXiii]

Sorry for replying so late too Σ( ° △ °|||)︴
Yes, the really Image resource create in FrameGraph::Execute stage. It will use context to call RenderContext::createTexture2D(...) and final call glCreateTextures(...) in RenderContext::_createImmutableTexture(...)

[FuXiii]

Before to create image or buffer, I need to design RenderContext, after that I can use it to create resource.（づ￣3￣）づ