From 9b5919ab22eb523246563b4ff6d9b91ad46c3e45 Mon Sep 17 00:00:00 2001
From: Robert Beckebans <robert.beckebans@gmail.com>
Date: Thu, 28 Oct 2021 11:12:07 +0200
Subject: [PATCH] Fixed DPI Scaling problems #616

---
 neo/sys/win32/win_main.cpp | 44 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 42 insertions(+), 2 deletions(-)

diff --git a/neo/sys/win32/win_main.cpp b/neo/sys/win32/win_main.cpp
index 3e69ed60..9c14a430 100644
--- a/neo/sys/win32/win_main.cpp
+++ b/neo/sys/win32/win_main.cpp
@@ -86,11 +86,48 @@ void Sys_GetExeLaunchMemoryStatus( sysMemoryStats_t& stats )
 
 /*
 ==================
-Sys_Sentry
+Sys_SetDPIAwareness #616
+
+Code that tells windows we're High DPI aware so it doesn't scale our windows.
+Taken from Yamagi Quake II
 ==================
 */
-void Sys_Sentry()
+typedef enum D3_PROCESS_DPI_AWARENESS
 {
+	D3_PROCESS_DPI_UNAWARE = 0,
+	D3_PROCESS_SYSTEM_DPI_AWARE = 1,
+	D3_PROCESS_PER_MONITOR_DPI_AWARE = 2
+} YQ2_PROCESS_DPI_AWARENESS;
+
+void Sys_SetDPIAwareness()
+{
+	// For Vista, Win7 and Win8
+	BOOL( WINAPI * SetProcessDPIAware )( void ) = NULL;
+
+	/* Win8.1 and later */
+	HRESULT( WINAPI * SetProcessDpiAwareness )( D3_PROCESS_DPI_AWARENESS dpiAwareness ) = NULL;
+
+
+	HINSTANCE userDLL = LoadLibrary( "USER32.DLL" );
+	if( userDLL )
+	{
+		SetProcessDPIAware = ( BOOL( WINAPI* )( void ) ) GetProcAddress( userDLL, "SetProcessDPIAware" );
+	}
+
+	HINSTANCE shcoreDLL = LoadLibrary( "SHCORE.DLL" );
+	if( shcoreDLL )
+	{
+		SetProcessDpiAwareness = ( HRESULT( WINAPI* )( YQ2_PROCESS_DPI_AWARENESS ) ) GetProcAddress( shcoreDLL, "SetProcessDpiAwareness" );
+	}
+
+	if( SetProcessDpiAwareness )
+	{
+		SetProcessDpiAwareness( D3_PROCESS_PER_MONITOR_DPI_AWARE );
+	}
+	else if( SetProcessDPIAware )
+	{
+		SetProcessDPIAware();
+	}
 }
 
 
@@ -1908,6 +1945,9 @@ int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLin
 
 	Sys_GetCurrentMemoryStatus( exeLaunchMemoryStats );
 
+	// DG: tell Windows 8+ we're high dpi aware, otherwise display scaling screws up the game
+	Sys_SetDPIAwareness();
+
 #if 0
 	DWORD handler = ( DWORD )_except_handler;
 	__asm