Are you supposed to / allowed to create more than one RenderPass in a single draw call?

[laptou]

I have a graph-based renderer that works by rendering shaders into intermediate textures, and then using those textures as inputs to the next group of shaders. I created a single RenderPass for each shader, and I seemed to get away with this when using Vulkan on Android and Linux. However, it doesn't seem to be working on Metal on iOS -- am I not supposed to do this?

[laptou]

Actually, since I'm rendering to a bunch of different textures, it stands to reason that I have to create multiple RenderPasses. So then am I only supposed to create one per CommandEncoder? Because I notice that when I do a GPU trace using Xcode, only the first RenderPass shows up, and I get a black screen :(

[kvark]

wgpu is a safe and portable API. If you were doing something you weren't expected to do, you'd get a validation error.
If you see something not working on a particular platform, it's likely an issue. Are you using store: false by any chance in your render passes? Please file a bug otherwise.

[laptou]

Oops, the issue I was seeing with the black screen was actually not related to wgpu.

If you were doing something you weren't expected to do, you'd get a validation error.

Got it, I guess that answers my question.