opengl context sharing with gstreamer

[Lusine Hayrapetyan]

Hi Folks,

I'm experimenting with gstreamer context sharing mechanism.
I have *EGLContext context; *and creating gstreamer shared context from it
with gst_gl_display_create_context()

Then I want to access the texture which is created in *EGLContext* from
gstreamer shared context.
That is why I'm using gst_gl_context_thread_add to activate shared context
and save the texture:

 gst_gl_context_thread_add(
        state->sharedContext,
        (GstGLContextThreadFunc)save_gst_tga,
        state
    );

// Activate gstreamer context and save the texture to tga file.
static bool save_gst_tga(GstGLContext * context, APP_STATE_T * state)
{
    if (!gst_gl_context_activate(state->sharedContext, true))
        g_print("gst_gl_context_activate(true) returned error %d\n",
eglGetError());

    // Gstreamer context is activated in gstreamer thread, now save the
texture.
    // But this produces an empty file!!!
    return save_tga(state, "tga_file_gst.tga");
}

In save_gst_tga I activate gstreamer shared context and save the texture
but it's empty. Am I missing something?
I've posted the whole code here:
https://github.com/LusineH/gstreamer_shared_context/blob/main/testegl.c

Regards,
Lusine
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