Android OpenGL ES Transparent Background

user_205229 0
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I'm building an Android app that takes advantage of OpenGL. As it stands, the background for the GLSurfaceView is dynamically generated by my code and loaded in as a texture and drawn with glDrawTexfOES. Which is "ok", but I can simply display the image much more smoothly to its own surface (without OpenGL). Is there any way that I can make the background of a GLSurfaceView transparent? I've heard some rumors that this can be done with setEGLConfigChooser, but I haven't found any confirmation. Ultimately, I'd like to take a surface which I'm drawing to and put the GLSurfaceView over it to achieve a layered effect.

I know this is a tricky and is quite possibly infeasible, but any input is appreciated. Thanks in advance.

transparent opengl-es background android
5 Answers

Just some simple changes that I did to get this to work.

On my GLSurfaceView.Renderer:

public void onSurfaceCreated(GL10 gl, EGLConfig config) {
    gl.glDisable(GL10.GL_DITHER);
    gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT,
            GL10.GL_FASTEST);

     gl.glClearColor(0,0,0,0);
     gl.glEnable(GL10.GL_CULL_FACE);
     gl.glShadeModel(GL10.GL_SMOOTH);
     gl.glEnable(GL10.GL_DEPTH_TEST);
}

On my GLSurfaceView:

setEGLConfigChooser(8, 8, 8, 8, 16, 0);
getHolder().setFormat(PixelFormat.TRANSLUCENT);
user_2052290

you should make sure the activity background is transparent!

If the activity's background is opaque, say white by default, then even when the content view (the glsurfaceview) is translucent, it will display the activity's white background as its background.

You can set the activity background transparency in the Android.manifest where it is declared, see the official API demo TranslucentGLSurfaceViewActivity for help

user_30487280
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