Modifying D3D12HelloFrameBuffering desktop to support fullscreen

• Download programs from : https://github.com/Microsoft/DirectX-Graphics-Samples

• DirectX-Graphics-Samples-master\Samples\Desktop\D3D12HelloWorld\src\HelloFrameBuffers

There is D3D12Fullscreen desktop project but it is little bit complicated so I modified D3D12FrameBuffering desktop project to enable Fullscreen capability.

D3D12FrameBuffering Project setting

Right click D3D12FrameBuffering Project top open D3D12HelloFrameBuffering property pages.
Select configuration to "All configurations"
On Configuration Options > Manifest Tool > All options, set DPI Awareness to Per Monitor High DPI Aware.

Win32Application class

Copy  WM_SIZE handler from D3D12Fullscreen Win32Application to WindowProc()

DXSample class

Add OnSizeChanged() pure virtual function declaration to DXSample class
 virtual void OnSizeChanged(UINT width, UINT height, bool minimized) = 0;

Copy SetWindowBounds() from D3D12Fullscreen DXSample.
Add     RECT m_windowBounds; member.

D3D12HelloFrameBuffering class

Comment out following line to enable ALT+Enter

factory->MakeWindowAssociation(Win32Application::GetHwnd(), DXGI_MWA_NO_ALT_ENTER)


Add bool m_windowedMode variable to D3D12HelloFrameBuffering class.


Copy those functions from D3D12Fullscreen to D3D12HelloFrameBuffer
 void LoadSizeDependentResources();
 void UpdatePostViewAndScissor();
 void LoadSceneResolutionDependentResources();
 virtual void OnSizeChanged(UINT width, UINT height, bool minimized);


 PopulateCommandList() is unchanged.

This is my UpdatePostViewAndScissor() implementation:

void D3D12HelloFrameBuffering::UpdatePostViewAndScissor()
{
    float x = 1.0f;
    float y = 1.0f;

    m_viewport.TopLeftX = m_width * (1.0f - x) / 2.0f;
    m_viewport.TopLeftY = m_height * (1.0f - y) / 2.0f;
    m_viewport.Width = x * m_width;
    m_viewport.Height = y * m_height;

    m_scissorRect.left = static_cast<LONG>(m_viewport.TopLeftX);
    m_scissorRect.right = static_cast<LONG>(m_viewport.TopLeftX + m_viewport.Width);
    m_scissorRect.top = static_cast<LONG>(m_viewport.TopLeftY);
    m_scissorRect.bottom = static_cast<LONG>(m_viewport.TopLeftY + m_viewport.Height);
}

m_resolutionOptions[], m_postViewport, m_postScissorRect, m_postCommandList and LoadSceneResolutionDependentResources() is not absolute necessary

 Call LoadSizeDependentResources() on the last portion of LoadAssets()

Run and press ALT+Enter to switch fullscreen

Screen shot of D3D12HelloFrameBuffering, 3840x2160 fullscreen mode