This tutorial demonstrates how to use Diligent Engine to render to multiple windows.

This tutorial is based on Tutorial00_HelloWin32 and in fact is only slightly more complicated. Essentially, instead of one window it creates three windows, and for every window it creates a swap chain using the window's handle. An important detail here is that one of the swap chains can be labeled as primary by setting corresponding member of the SwapChainDesc struct. It is the back buffer and depth-stencil buffer of the primary swap that are set by SetRenderTargets(0, nullptr, nullptr) call. Notice that there must only be one primary swap chain. Also, when Present() is called for the primary swap chain, the engine increments the frame counter and releases stale resources.

To bind render target and depth-stencil buffers of the secondary swap chain, use ISwapChain::GetCurrentBackBufferRTV() and ISwapChain::GetDepthBufferDSV() methods:

ITextureView* pRTV = pSwapChain->GetCurrentBackBufferRTV();
ITextureView* pDSV = pSwapChain->GetDepthBufferDSV();
m_pImmediateContext->SetRenderTargets(1, &pRTV, pDSV, RESOURCE_STATE_TRANSITION_MODE_TRANSITION);

When the application is done with rendering commands, it should call Present() for every swap chain.