--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/freeglut/src/fg_input_devices.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,207 @@
+/*
+ * fg_input_devices.c
+ *
+ * Handles miscellaneous input devices via direct serial-port access.
+ * Proper X11 XInput device support is not yet supported.
+ * Also lacks Mac support.
+ *
+ * Written by Joe Krahn <krahn@niehs.nih.gov> 2005
+ *
+ * Copyright (c) 2005 Stephen J. Baker. All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * PAWEL W. OLSZTA OR STEPHEN J. BAKER BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <GL/freeglut.h>
+#include "fg_internal.h"
+
+typedef struct _serialport SERIALPORT;
+
+
+/********************* Dialbox definitions ***********************/
+
+#define DIAL_NUM_VALUATORS 8
+
+/* dial parser state machine states */
+#define DIAL_NEW                (-1)
+#define DIAL_WHICH_DEVICE       0
+#define DIAL_VALUE_HIGH         1
+#define DIAL_VALUE_LOW          2
+
+/* dial/button box commands */
+#define DIAL_INITIALIZE                 0x20
+#define DIAL_SET_LEDS                   0x75
+#define DIAL_SET_TEXT                   0x61
+#define DIAL_SET_AUTO_DIALS             0x50
+#define DIAL_SET_AUTO_DELTA_DIALS       0x51
+#define DIAL_SET_FILTER                 0x53
+#define DIAL_SET_BUTTONS_MOM_TYPE       0x71
+#define DIAL_SET_AUTO_MOM_BUTTONS       0x73
+#define DIAL_SET_ALL_LEDS               0x4b
+#define DIAL_CLEAR_ALL_LEDS             0x4c
+
+/* dial/button box replies and events */
+#define DIAL_INITIALIZED        0x20
+#define DIAL_BASE               0x30
+#define DIAL_DELTA_BASE         0x40
+#define DIAL_PRESS_BASE         0xc0
+#define DIAL_RELEASE_BASE       0xe0
+
+/* macros to determine reply type */
+#define IS_DIAL_EVENT(ch)       (((ch)>=DIAL_BASE)&&((ch)<DIAL_BASE+DIAL_NUM_VALUATORS))
+#define IS_KEY_PRESS(ch)        (((ch)>=DIAL_PRESS_BASE)&&((ch)<DIAL_PRESS_BASE+DIAL_NUM_BUTTONS))
+#define IS_KEY_RELEASE(ch)      (((ch)>=DIAL_RELEASE_BASE)&&((ch)<DIAL_RELEASE_BASE+DIAL_NUM_BUTTONS))
+#define IS_INIT_EVENT(ch)       ((ch)==DIAL_INITIALIZED)
+
+/*****************************************************************/
+
+extern SERIALPORT *serial_open ( const char *device );
+extern void serial_close ( SERIALPORT *port );
+extern int serial_getchar ( SERIALPORT *port );
+extern int serial_putchar ( SERIALPORT *port, unsigned char ch );
+extern void serial_flush ( SERIALPORT *port );
+
+extern void fgPlatformRegisterDialDevice ( const char *dial_device );
+static void send_dial_event(int dial, int value);
+static void poll_dials(int id);
+
+/* local variables */
+static SERIALPORT *dialbox_port=NULL;
+
+/*****************************************************************/
+
+/*
+ * Implementation for glutDeviceGet(GLUT_HAS_DIAL_AND_BUTTON_BOX)
+ */
+int fgInputDeviceDetect( void )
+{
+    fgInitialiseInputDevices ();
+
+    if ( !dialbox_port )
+        return 0;
+
+    if ( !fgState.InputDevsInitialised )
+        return 0;
+
+    return 1;
+}
+
+/*
+ * Try initializing the input device(s)
+ */
+void fgInitialiseInputDevices ( void )
+{
+    if( !fgState.InputDevsInitialised )
+    {
+        const char *dial_device=NULL;
+        dial_device = getenv ( "GLUT_DIALS_SERIAL" );
+		fgPlatformRegisterDialDevice ( dial_device );
+
+        if ( !dial_device ) return;
+        if ( !( dialbox_port = serial_open ( dial_device ) ) ) return;
+        serial_putchar(dialbox_port,DIAL_INITIALIZE);
+        glutTimerFunc ( 10, poll_dials, 0 );
+        fgState.InputDevsInitialised = GL_TRUE;
+    }
+}
+
+/*
+ *
+ */
+void fgInputDeviceClose( void )
+{
+    if ( fgState.InputDevsInitialised )
+    {
+        serial_close ( dialbox_port );
+        dialbox_port = NULL;
+        fgState.InputDevsInitialised = GL_FALSE;
+    }
+}
+
+/********************************************************************/
+
+/* Check all windows for dialbox callbacks */
+static void fghcbEnumDialCallbacks ( SFG_Window *window, SFG_Enumerator *enumerator )
+{
+    /* Built-in to INVOKE_WCB():  if window->Callbacks[CB_Dials] */
+    INVOKE_WCB ( *window,Dials, ( ((int*)enumerator->data)[0], ((int*)enumerator->data)[1]) );
+    fgEnumSubWindows ( window, fghcbEnumDialCallbacks, enumerator );
+}
+
+static void send_dial_event ( int num, int value )
+{
+    SFG_Enumerator enumerator;
+    int data[2];
+    data[0] = num;
+    data[1] = value;
+    enumerator.found = GL_FALSE;
+    enumerator.data  =  data;
+    fgEnumWindows ( fghcbEnumDialCallbacks, &enumerator );
+}
+
+/********************************************************************/
+static void poll_dials ( int id )
+{
+    int data;
+    static int dial_state = DIAL_NEW;
+    static int dial_which;
+    static int dial_value;
+
+    if ( !dialbox_port ) return;
+
+    while ( (data=serial_getchar(dialbox_port)) != EOF )
+    {
+        if ( ( dial_state > DIAL_WHICH_DEVICE ) || IS_DIAL_EVENT ( data ) )
+        {
+            switch ( dial_state )
+            {
+            case DIAL_WHICH_DEVICE:
+                dial_which = data - DIAL_BASE;
+                dial_state++;
+                break;
+            case DIAL_VALUE_HIGH:
+                dial_value = ( data << 8 );
+                dial_state++;
+                break;
+            case DIAL_VALUE_LOW:
+                dial_value |= data;
+                if ( dial_value & 0x8000 ) dial_value -= 0x10000;
+                send_dial_event ( dial_which + 1, dial_value * 360 / 256 );
+                dial_state = DIAL_WHICH_DEVICE;
+                break;
+            default:
+                /* error: Impossible state value! */
+                break;
+            }
+        }
+        else if ( data == DIAL_INITIALIZED )
+        {
+            fgState.InputDevsInitialised = GL_TRUE;
+            dial_state = DIAL_WHICH_DEVICE;
+            serial_putchar(dialbox_port,DIAL_SET_AUTO_DIALS);
+            serial_putchar(dialbox_port,0xff);
+            serial_putchar(dialbox_port,0xff);
+        }
+        else  /* Unknown data; try flushing. */
+            serial_flush(dialbox_port);
+    }
+
+    glutTimerFunc ( 2, poll_dials, 0 );
+}
+