is it possible to create an Angle surface from an external Metal Layer

[escamoteur]

Hi,

I'm extremely grateful that you wrote this library!

I'm evaluating to use Angle to implement a WebGL plugin for Flutter Apps. The graphic backend of Flutter on iOs and MacOS is currently migrated to use metal instead of OpenGL.

So my question is, if I can get access to the Metal layer of a Flutter Texture, would it be posible to create an OpenGL ES surface from this that could be used with MetalAngle to draw on it?

Cheers Thomas

[kakashidinho]

Hi, Yes, you can import external Metal texture to MetalANGLE to create an EGLImage object, then you use it to create OpenGL texture object that can be used as attachment of a framebuffer which will be able to be rendered into. This is example:

1. Import MTLTexture to create EGLImage object: https://github.com/kakashidinho/metalangle/blob/9cfbd26f3dc600713704de5ebb33f542fa65c739/src/tests/gl_tests/ImageTestMetal.mm#L332
2. Bind EGLImage to GL texture object which can be used by OpenGL functions: https://github.com/kakashidinho/metalangle/blob/9cfbd26f3dc600713704de5ebb33f542fa65c739/src/tests/gl_tests/ImageTestMetal.mm#L348

[escamoteur]

Thanks a lot!