Copying data from one texture to another

I'm rendering my camera preview in android on a SurfaceTexure . This SurfaceTexture is bound to target GL_TEXTURE_EXTERNAL_OES . I want to copy the texture data from this SurfaceTexture object to my custom OpenGL texture which is bound to GL_TEXTURE_2D .

My onFrameAvailable callback is as follows :

@Override
public void onFrameAvailable(final SurfaceTexture surfaceTexture) {
    glView.queueEvent(new Runnable() {
        @Override
        public void run() {
            surfaceTexture.updateTexImage();
            //TODO: Copy this texture to the custom texture
        }
    });
}

I have the custom texture object created already.

Can anyone help me with the copying part ?

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通常的做法是将颜色附件中的纹理绑定到FBO，选择该FBO作为活动并使用glCopyTexImage从FBO复制到目标纹理中。

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