void DeferredRenderingApp::drawOverlay() const
{
Vec3f camUp, camRight;
mCam.getBillboardVectors(&camRight, &camUp);
//create text labels
TextLayout layout1;
layout1.clear( ColorA( 1.0f, 1.0f, 1.0f, 0.0f ) );
layout1.setFont( Font( "Arial", 34 ) );
layout1.setColor( ColorA( 255.0f/255.0f, 255.0f/255.0f, 8.0f/255.0f, 1.0f ) );
layout1.addLine( to_string(getAverageFps()) ); //to_string is a c++11 function for conversions
Surface8u rendered1 = layout1.render( true, false );
gl::Texture fontTexture_FR = gl::Texture( rendered1 );
//draw framerate
fontTexture_FR.bind();
gl::drawBillboard(Vec3f(-3.0f, 7.0f, 20.0f), Vec2f(fontTexture_FR.getWidth()/20.0f , fontTexture_FR.getHeight()/20.0f), 0, camRight, camUp);
fontTexture_FR.unbind();
}
