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TestApp1/TestApp1.cpp

 	{
 		DKObject<DKGraphicsDevice> device = DKGraphicsDevice::SharedInstance();
 		DKObject<DKCommandQueue> queue = device->CreateCommandQueue();
-		DKObject<DKCommandBuffer> buffer = queue->CreateCommandBuffer();
 		DKObject<DKSwapChain> swapChain = queue->CreateSwapChain(window);
 
 		DKTimer timer;
 		while (!runningRenderThread.CompareAndSet(0, 0))
 		{
 			DKRenderPassDescriptor rpd = swapChain->CurrentRenderPassDescriptor();
+			double t = timer.Elapsed();
+			t = (cos(t) + 1.0) * 0.5;
+			rpd.colorAttachments.Value(0).clearColor = DKColor(t, 0.0, 0.0, 0.0);
+
+			DKObject<DKCommandBuffer> buffer = queue->CreateCommandBuffer();
 			DKObject<DKRenderCommandEncoder> encoder = buffer->CreateRenderCommandEncoder(rpd);
 			if (encoder)
 			{
 				// draw scene!
 
+				encoder->EndEncoding();
+				buffer->Commit();
 				swapChain->Present();
 			}
 			else