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TestApp1/TestApp1.cpp

 		DKLog("Render thread begin");
 		while (!runningRenderThread.CompareAndSet(0, 0))
 		{
+			DKRenderPassDescriptor rpd = swapChain->CurrentRenderPassDescriptor();
+			DKObject<DKRenderCommandEncoder> encoder = buffer->CreateRenderCommandEncoder(rpd);
+			if (encoder)
+			{
+				// draw scene!
 
+				swapChain->Present();
+			}
+			else
+			{
+			}
 
 			DKThread::Sleep(0.01);
 		}