From 847698dd32cf16357c8a7ba8b259f04ac766d3b2 Mon Sep 17 00:00:00 2001
From: Matt Tytel <matt@vital.audio>
Date: Thu, 31 Oct 2024 13:09:05 -0400
Subject: [PATCH] Use DXGI_SWAP_CHAIN_DESC1 if available for additional scaling
 options.

---
 src/dxgi.cpp | 80 ++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 59 insertions(+), 21 deletions(-)

diff --git a/src/dxgi.cpp b/src/dxgi.cpp
index 4eae796d31..4cbf95036f 100644
--- a/src/dxgi.cpp
+++ b/src/dxgi.cpp
@@ -496,28 +496,66 @@ namespace bgfx
 			DX_RELEASE_I(factory5);
 		}
 
-		DXGI_SWAP_CHAIN_DESC scd;
-		scd.BufferDesc.Width  = _scd.width;
-		scd.BufferDesc.Height = _scd.height;
-		scd.BufferDesc.RefreshRate.Numerator   = 1;
-		scd.BufferDesc.RefreshRate.Denominator = 60;
-		scd.BufferDesc.Format = _scd.format;
-		scd.BufferDesc.ScanlineOrdering = DXGI_MODE_SCANLINE_ORDER_UNSPECIFIED;
-		scd.BufferDesc.Scaling = DXGI_MODE_SCALING_UNSPECIFIED;
-		scd.SampleDesc.Count   = 1;
-		scd.SampleDesc.Quality = 0;
-		scd.BufferUsage  = _scd.bufferUsage;
-		scd.BufferCount  = _scd.bufferCount;
-		scd.OutputWindow = (HWND)_scd.nwh;
-		scd.Windowed     = _scd.windowed;
-		scd.SwapEffect   = _scd.swapEffect;
-		scd.Flags        = scdFlags;
-
-		hr = m_factory->CreateSwapChain(
-			  _device
-			, &scd
-			, reinterpret_cast<IDXGISwapChain**>(_swapChain)
+		IDXGIFactory2* factory2;
+		hr = m_factory->QueryInterface(IID_IDXGIFactory2, (void**)&factory2);
+
+		if (SUCCEEDED(hr) )
+    {
+			DX_RELEASE_I(factory2);
+			DXGI_SWAP_CHAIN_DESC1 scd;
+			scd.Width  = _scd.width;
+			scd.Height = _scd.height;
+			scd.Format = _scd.format;
+			scd.Stereo = _scd.stereo;
+			scd.SampleDesc.Count   = 1;
+			scd.SampleDesc.Quality = 0;
+			scd.BufferUsage = _scd.bufferUsage;
+			scd.BufferCount = _scd.bufferCount;
+			scd.Scaling    = _scd.scaling;
+			scd.SwapEffect = _scd.swapEffect;
+			scd.AlphaMode  = _scd.alphaMode;
+			scd.Flags      = scdFlags;
+
+			DXGI_SWAP_CHAIN_FULLSCREEN_DESC scfd;
+			scfd.RefreshRate.Numerator   = 1;
+			scfd.RefreshRate.Denominator = 60;
+			scfd.ScanlineOrdering = DXGI_MODE_SCANLINE_ORDER_UNSPECIFIED;
+			scfd.Scaling  = DXGI_MODE_SCALING_UNSPECIFIED;
+			scfd.Windowed = _scd.windowed;
+
+			hr = m_factory->CreateSwapChainForHwnd(
+				_device
+				, (HWND)_scd.nwh
+				, &scd
+				, &scfd, NULL
+				, reinterpret_cast<IDXGISwapChain1**>(_swapChain)
 			);
+		}
+		else
+    {
+			DXGI_SWAP_CHAIN_DESC scd;
+			scd.BufferDesc.Width  = _scd.width;
+			scd.BufferDesc.Height = _scd.height;
+			scd.BufferDesc.RefreshRate.Numerator   = 1;
+			scd.BufferDesc.RefreshRate.Denominator = 60;
+			scd.BufferDesc.Format = _scd.format;
+			scd.BufferDesc.ScanlineOrdering = DXGI_MODE_SCANLINE_ORDER_UNSPECIFIED;
+			scd.BufferDesc.Scaling = DXGI_MODE_SCALING_UNSPECIFIED;
+			scd.SampleDesc.Count   = 1;
+			scd.SampleDesc.Quality = 0;
+			scd.BufferUsage  = _scd.bufferUsage;
+			scd.BufferCount  = _scd.bufferCount;
+			scd.OutputWindow = (HWND)_scd.nwh;
+			scd.Windowed     = _scd.windowed;
+			scd.SwapEffect   = _scd.swapEffect;
+			scd.Flags        = scdFlags;
+
+			hr = m_factory->CreateSwapChain(
+					_device
+				, &scd
+				, reinterpret_cast<IDXGISwapChain**>(_swapChain)
+				);
+		}
 #else
 		DXGI_SWAP_CHAIN_DESC1 scd;
 		scd.Width  = _scd.width;