Fixed scaling issue on Windows.

client/source/main.cpp

@@ -41,7 +41,46 @@ extern "C" {
 }
 #endif
 
+// Fix the scaling problem encountered with Windows
+// From: https://discourse.libsdl.org/t/sdl-getdesktopdisplaymode-resolution-reported-in-windows-10-when-using-app-scaling/22389/4
+#ifdef _WIN32
+typedef enum PROCESS_DPI_AWARENESS {
+	PROCESS_DPI_UNAWARE = 0,
+	PROCESS_SYSTEM_DPI_AWARE = 1,
+	PROCESS_PER_MONITOR_DPI_AWARE = 2
+} PROCESS_DPI_AWARENESS;
+
+BOOL(WINAPI *SetProcessDPIAware)(void); // Vista and later
+HRESULT(WINAPI *SetProcessDpiAwareness)(PROCESS_DPI_AWARENESS dpiAwareness); // Windows 8.1 and later
+
+void setDpiAwareness() {
+	void *userDLL = SDL_LoadObject("USER32.DLL");
+	if (userDLL) {
+		SetProcessDPIAware = (BOOL(WINAPI *)(void))SDL_LoadFunction(userDLL, "SetProcessDPIAware");
+	}
+
+	void *shcoreDLL = SDL_LoadObject("SHCORE.DLL");
+	if (shcoreDLL) {
+		SetProcessDpiAwareness = (HRESULT(WINAPI *)(PROCESS_DPI_AWARENESS))SDL_LoadFunction(shcoreDLL, "SetProcessDpiAwareness");
+	}
+
+	if (SetProcessDpiAwareness) {
+		// Try Windows 8.1+ version
+		HRESULT result = SetProcessDpiAwareness(PROCESS_PER_MONITOR_DPI_AWARE);
+	}
+	else if (SetProcessDPIAware) {
+		// Try Vista - Windows 8 version.
+		// This has a constant scale factor for all monitors.
+		BOOL success = SetProcessDPIAware();
+	}
+}
+#endif
+
 int main(int argc, char **argv) {
+#ifdef _WIN32
+	setDpiAwareness();
+#endif
+
 	ClientApplication app(argc, argv);
 	app.run();