--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/freeglut/src/fg_spaceball.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,76 @@
+/* Spaceball support for Linux.
+ * Written by John Tsiombikas <nuclear@member.fsf.org>
+ *
+ * This code supports 3Dconnexion's 6-dof space-whatever devices.
+ * It can communicate with either the proprietary 3Dconnexion daemon (3dxsrv)
+ * free spacenavd (http://spacenav.sourceforge.net), through the "standard"
+ * magellan X-based protocol.
+ */
+
+#include <GL/freeglut.h>
+#include "fg_internal.h"
+
+/* -- PRIVATE FUNCTIONS --------------------------------------------------- */
+
+extern void fgPlatformInitializeSpaceball(void);
+extern void fgPlatformSpaceballClose(void);
+extern int fgPlatformHasSpaceball(void);
+extern int fgPlatformSpaceballNumButtons(void);
+extern void fgPlatformSpaceballSetWindow(SFG_Window *window);
+
+
+int sball_initialized = 0;
+
+void fgInitialiseSpaceball(void)
+{
+    if(sball_initialized != 0) {
+        return;
+    }
+
+    fgPlatformInitializeSpaceball();
+
+    sball_initialized = 1;
+}
+
+void fgSpaceballClose(void)
+{
+	fgPlatformSpaceballClose();}
+
+int fgHasSpaceball(void)
+{
+    if(sball_initialized == 0) {
+        fgInitialiseSpaceball();
+        if(sball_initialized != 1) {
+            fgWarning("fgInitialiseSpaceball failed\n");
+            return 0;
+        }
+    }
+
+    return fgPlatformHasSpaceball();
+}
+
+int fgSpaceballNumButtons(void)
+{
+    if(sball_initialized == 0) {
+        fgInitialiseSpaceball();
+        if(sball_initialized != 1) {
+            fgWarning("fgInitialiseSpaceball failed\n");
+            return 0;
+        }
+    }
+
+    return fgPlatformSpaceballNumButtons();
+}
+
+void fgSpaceballSetWindow(SFG_Window *window)
+{
+    if(sball_initialized == 0) {
+        fgInitialiseSpaceball();
+        if(sball_initialized != 1) {
+            return;
+        }
+    }
+
+    fgPlatformSpaceballSetWindow(window);
+}
+