Sharing resources between an OpenGL context on Android

Question

I am trying to use multiple EGL contexts to load textures outside the main thread. I get an error EGL_BAD_CONTEXTafter my call eglCreateContext.

Inside my android.opengl.Renderer

public void onSurfaceCreated (javax.microedition.khronos.opengles.GL10 gl, EGLConfig config) {
    // ...
    EGLContext sharedContext = egl.getCurrentContext();
    EGLDisplay display = eglGetCurrentDisplay();
    eglCreateContext(display, config, sharedContext, new int[] { EGL_CONTEXT_CLIENT_VERSION, 2 } );
}

EGL_BAD_CONTEXTwill lead me to the documentation here which says

EGL_BAD_CONTEXT is generated if share_context is not an EGL mapping context of the same type of API client as the created context and is not EGL_NO_CONTEXT.

This is why I added to the parameter EGL_CONTEXT_CLIENT_VERSION, but it seems to have done nothing.

What I see is that although I am getting this error, the context seems to be semi-valid. I can use it in another thread

egl.eglMakeCurrent(display, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_SURFACE, context);

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E/AndroidRuntime(3210): java.lang.IllegalArgumentException
E/AndroidRuntime(3210):     at com.google.android.gles_jni.EGLImpl._eglCreateContext(Native Method)
E/AndroidRuntime(3210):     at com.google.android.gles_jni.EGLImpl.eglCreateContext(EGLImpl.java:54)

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Answer 1

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egl.eglCreatePbufferSurface(display, config, new int[] { EGL10.EGL_WIDTH, 1, EGL10.EGL_HEIGHT, 1, EGL10.EGL_NONE });