Merge pull request #29550 from xsellier/feature/HiDPI-support-for-windows

[2.1] Backporting HiDPI support on Windows.. yes this is all it took (cherry-pick)

platform/windows/os_windows.cpp

@@ -937,6 +937,13 @@ static int QueryDpiForMonitor(HMONITOR hmon, _MonitorDpiType dpiType = MDT_Defau
 	return (dpiX + dpiY) / 2;
 }
 
+typedef enum _SHC_PROCESS_DPI_AWARENESS {
+  SHC_PROCESS_DPI_UNAWARE            = 0,
+  SHC_PROCESS_SYSTEM_DPI_AWARE       = 1,
+  SHC_PROCESS_PER_MONITOR_DPI_AWARE  = 2
+} SHC_PROCESS_DPI_AWARENESS;
+
+
 void OS_Windows::initialize(const VideoMode &p_desired, int p_video_driver, int p_audio_driver) {
 
 	main_loop = NULL;
@@ -944,6 +951,21 @@ void OS_Windows::initialize(const VideoMode &p_desired, int p_video_driver, int
 
 	WNDCLASSEXW wc;
 
+	if (is_hidpi_allowed()) {
+		HMODULE Shcore = LoadLibraryW(L"Shcore.dll");;
+
+		if (Shcore != NULL) {
+			typedef HRESULT (WINAPI *SetProcessDpiAwareness_t)(SHC_PROCESS_DPI_AWARENESS);
+
+			SetProcessDpiAwareness_t  SetProcessDpiAwareness = (SetProcessDpiAwareness_t)GetProcAddress(Shcore, "SetProcessDpiAwareness");
+
+			if (SetProcessDpiAwareness) {
+				SetProcessDpiAwareness(SHC_PROCESS_SYSTEM_DPI_AWARE);
+			}
+		}
+	}
+
+
 	video_mode = p_desired;
 	//printf("**************** desired %s, mode %s\n", p_desired.fullscreen?"true":"false", video_mode.fullscreen?"true":"false");
 	RECT WindowRect;