How can GLSurfaceView use my EGLDisplay, EGLContext and eglSurface?

Question

I want to render alternatively to an EGLSurface created with eglCreateWindowSurface and one with eglCreatePbufferSurface, reusing the EGLDisplay and EGLContext. I am using a GLSurfaceView for the case when I want the result to be visible to the user, but I don't know how to initialize it to use my EGLDisplay, EGLContext and EGLSurface. I want to use GLSurfaceView.EGLWindowSurfaceFactory, but I see its override method createWindowSurface already has as input params those variables, so I suppose thy are already created by GLSurfaceView. How can it be done?

Answer 1

The whole point of GLSurfaceView is to manage things like that for you, so it's hard to make it do what you want.

One thing you can do is to wait until the GLSurfaceView is created and then create a second EGL context in a share group. This is a bit awkward but can be made to work. In many ways it's simpler to just switch to SurfaceView or TextureView and manage EGL and threading yourself.

You can see various implementations in Grafika. "Show + capture camera" uses GLSurfaceView with a shared EGLContext, "Record GL app with FBO" uses SurfaceView, "Play movie (TextureView)" uses a TextureView, etc.