Flutter integration

[nrbnlulu]

Hi, might be a noob question.
Flutter uses different graphic api's for each platform:
IIRC
Windows: d3d
Linux: OpenGL
MacOS / IOS: Metal
Android: OpenGLES / Vulkan

Anyways I have 4 questions is possible:

1. is it possible to tell wgpu what graphics backend to use
2. is it possible (prob is) to "store" wgpu rendering pipeline to a texture?
3. I would prob need to provide wgpu the context that flutter uses (in opengl)
   how can I do synchronization (current gl context)?
4. how can I know if a new "frame" is available?

[cwfitzgerald]

is it possible to tell wgpu what graphics backend to use

Yes

is it possible (prob is) to "store" wgpu rendering pipeline to a texture?

I'm not sure what this means.

I would prob need to provide wgpu the context that flutter uses (in opengl)

https://docs.rs/wgpu-hal/latest/wgpu_hal/gles/struct.Adapter.html#method.new_external.

how can I do synchronization (current gl context)?

I don't think you'd generally need to?

how can I know if a new "frame" is available?

Use whatever integration that flutter's GL context demands you use, then record and submit wgpu->gl commands when it tells you to.

[nrbnlulu]

is it possible (prob is) to "store" wgpu rendering pipeline to a texture?

I'm not sure what this means.

In flutter in order to integrate with 3rd party rendered stuff you need to convert the frame to a texture
my usecase is https://github.com/Maximkaaa/galileo and I'll need to feed flutter with a texture (in OpenGL terms) on each frame.

[cwfitzgerald]

Yeah you can get the raw texture from a texture by calling as_hal on a texture, then looking at https://docs.rs/wgpu-hal/24.0.0/wgpu_hal/gles/struct.Texture.html