private void SetupViewport()
{
// If this throws an assert, you are calling MakeCurrent() before the glControl is done being constructed.
// Call this function you have called Show().
glControl.MakeCurrent();
int w = glControl.Width;
int h = glControl.Height;
#if USE_GLES
GL.MatrixMode(All.Projection);
#else
GL.MatrixMode(MatrixMode.Projection);
#endif
GL.LoadIdentity();
GL.Ortho(0, w, 0, h, -1, 1); // Bottom-left corner pixel has coordinate (0, 0)
GL.Viewport(0, 0, w, h); // Use all of the glControl painting area
}
protected override void OnClosed(EventArgs e)
{
glControl.MakeCurrent();
glControl.releaseAllGlData.Release();
base.OnClosed(e);
}