InstancingDemo2D.InstancingDemo.Update C# (CSharp) Method

		protected override void Update ( GameTime gameTime )
		{
			var ds = GetService<DebugStrings>();

			ds.Add( Color.Orange, "FPS {0}", gameTime.Fps );
			ds.Add( "F1   - show developer console" );
			ds.Add( "F2   - toggle vsync" );
			ds.Add( "F5   - build content and reload textures" );
			ds.Add( "F12  - make screenshot" );
			ds.Add( "ESC  - exit" );
			ds.Add("");

			base.Update( gameTime );

			var rand = new Random();
			for (int i=0; i<InstanceCount; i++) {
				instDataCpu[ i ].Scale		=	0.2f * (0.5f + 0.4f*(float)Math.Cos( 0.17*i + gameTime.Total.TotalSeconds * 2 ));
				instDataCpu[ i ].Rotation	+= (MathUtil.IsOdd(i) ? 0.01f : -0.01f);
				instDataCpu[ i ].Offset.Y	+= (MathUtil.IsOdd(i) ? 0.001f : -0.001f);
				
				if (instDataCpu[ i ].Offset.Y > 2) {
					instDataCpu[ i ].Offset.Y = -2;
				}
				if (instDataCpu[ i ].Offset.Y < -2) {
					instDataCpu[ i ].Offset.Y = 2;
				}
				/*float c = (1 - (instDataCpu[ i ].Offset.Y + 2)/4);
				c *= c * 0.5f;
				instDataCpu[ i ].Color = new Vector4(c,c,c,c);*/
			}

			instDataGpu.SetData( instDataCpu );
		}