Re: [android-developers] [OpenGL ES] 2D controls over 3D world

I myself wouldn't do this every frame. I would have both the 3D and 2D
projection matrices cached someplace and bang it in with glLoadMatrix
each frame. You likely are using these for culling and other stuff
anyways. I wouldn't bother with push/pop but in reality it's likely a
very small performance difference.

Leigh

On 6/20/2010 5:10 PM, Simone wrote:
> Hi, I created a 3D world, and I managed to draw 2D overlay controls
> (as in a game) over it.
> I did it with this:
>
> public void onDrawFrame(GL10 gl) {
> //some 3d draws and transformations here
>
> gl.glMatrixMode(GL10.GL_PROJECTION);
> gl.glPushMatrix();
> gl.glLoadIdentity();
> GLU.gluOrtho2D(gl, 0, WIDTH, 0, HEIGHT);
>
> gl.glMatrixMode(GL10.GL_MODELVIEW);
> gl.glPushMatrix();
> gl.glLoadIdentity();
> square1.draw(gl);
> square2.draw(gl);
> gl.glPopMatrix();
>
> gl.glMatrixMode(GL10.GL_PROJECTION);
> gl.glPopMatrix();
> gl.glMatrixMode(GL10.GL_MODELVIEW);
> ...
> }
>
> Since I don't like it one bit, is there a more efficent (and elegant)
> way to do it?
> Thanks
> Simone
>
>

--
Leigh McRae
www.lonedwarfgames.com

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