--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/freeglut/src/fg_callbacks.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,295 @@
+/*
+ * fg_callbacks.c
+ *
+ * The callbacks setting methods.
+ *
+ * Copyright (c) 1999-2000 Pawel W. Olszta. All Rights Reserved.
+ * Written by Pawel W. Olszta, <olszta@sourceforge.net>
+ * Creation date: Fri Dec 3 1999
+ *
+ * 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 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"
+
+/* -- INTERFACE FUNCTIONS -------------------------------------------------- */
+
+
+/*
+ * Global callbacks.
+ */
+/* Sets the global idle callback */
+void FGAPIENTRY glutIdleFunc( FGCBIdle callback )
+{
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutIdleFunc" );
+    fgState.IdleCallback = callback;
+}
+
+/* Creates a timer and sets its callback */
+void FGAPIENTRY glutTimerFunc( unsigned int timeOut, FGCBTimer callback, int timerID )
+{
+    SFG_Timer *timer, *node;
+
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutTimerFunc" );
+
+    if( (timer = fgState.FreeTimers.Last) )
+    {
+        fgListRemove( &fgState.FreeTimers, &timer->Node );
+    }
+    else
+    {
+        if( ! (timer = malloc(sizeof(SFG_Timer))) )
+            fgError( "Fatal error: "
+                     "Memory allocation failure in glutTimerFunc()" );
+    }
+
+    timer->Callback  = callback;
+    timer->ID        = timerID;
+    timer->TriggerTime = fgElapsedTime() + timeOut;
+
+    /* Insert such that timers are sorted by end-time */
+    for( node = fgState.Timers.First; node; node = node->Node.Next )
+    {
+        if( node->TriggerTime > timer->TriggerTime )
+            break;
+    }
+
+    fgListInsert( &fgState.Timers, &node->Node, &timer->Node );
+}
+
+/* Deprecated version of glutMenuStatusFunc callback setting method */
+void FGAPIENTRY glutMenuStateFunc( FGCBMenuState callback )
+{
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutMenuStateFunc" );
+    fgState.MenuStateCallback = callback;
+}
+
+/* Sets the global menu status callback for the current window */
+void FGAPIENTRY glutMenuStatusFunc( FGCBMenuStatus callback )
+{
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutMenuStatusFunc" );
+    fgState.MenuStatusCallback = callback;
+}
+
+
+/*
+ * Menu specific callbacks.
+ */
+/* Callback upon menu destruction */
+void FGAPIENTRY glutMenuDestroyFunc( FGCBDestroy callback )
+{
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutMenuDestroyFunc" );
+    if( fgStructure.CurrentMenu )
+        fgStructure.CurrentMenu->Destroy = callback;
+}
+
+
+/*
+ * All of the window-specific callbacks setting methods can be generalized to this:
+ */
+#define SET_CALLBACK(a)                                         \
+do                                                              \
+{                                                               \
+    if( fgStructure.CurrentWindow == NULL )                     \
+        return;                                                 \
+    SET_WCB( ( *( fgStructure.CurrentWindow ) ), a, callback ); \
+} while( 0 )
+/*
+ * And almost every time the callback setter function can be implemented like this:
+ */
+#define IMPLEMENT_CALLBACK_FUNC_2NAME(a,b)                      \
+void FGAPIENTRY glut##a##Func( FGCB##b callback )               \
+{                                                               \
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glut"#a"Func" );    \
+    SET_CALLBACK( b );                                          \
+}
+#define IMPLEMENT_CALLBACK_FUNC(a) IMPLEMENT_CALLBACK_FUNC_2NAME(a,a)
+
+/* Implement all these callback setter functions... */
+IMPLEMENT_CALLBACK_FUNC(Position)
+IMPLEMENT_CALLBACK_FUNC(Keyboard)
+IMPLEMENT_CALLBACK_FUNC(KeyboardExt)
+IMPLEMENT_CALLBACK_FUNC(KeyboardDown)
+IMPLEMENT_CALLBACK_FUNC(KeyboardUp)
+IMPLEMENT_CALLBACK_FUNC(Special)
+IMPLEMENT_CALLBACK_FUNC(SpecialUp)
+IMPLEMENT_CALLBACK_FUNC(Mouse)
+IMPLEMENT_CALLBACK_FUNC(MouseWheel)
+IMPLEMENT_CALLBACK_FUNC(Motion)
+IMPLEMENT_CALLBACK_FUNC_2NAME(PassiveMotion,Passive)
+IMPLEMENT_CALLBACK_FUNC(Entry)
+/* glutWMCloseFunc is an alias for glutCloseFunc; both set the window's Destroy callback */
+IMPLEMENT_CALLBACK_FUNC_2NAME(Close,Destroy)
+IMPLEMENT_CALLBACK_FUNC_2NAME(WMClose,Destroy)
+IMPLEMENT_CALLBACK_FUNC(OverlayDisplay)
+IMPLEMENT_CALLBACK_FUNC(WindowStatus)
+IMPLEMENT_CALLBACK_FUNC(ButtonBox)
+IMPLEMENT_CALLBACK_FUNC(Dials)
+IMPLEMENT_CALLBACK_FUNC(TabletMotion)
+IMPLEMENT_CALLBACK_FUNC(TabletButton)
+IMPLEMENT_CALLBACK_FUNC(MultiEntry)
+IMPLEMENT_CALLBACK_FUNC(MultiButton)
+IMPLEMENT_CALLBACK_FUNC(MultiMotion)
+IMPLEMENT_CALLBACK_FUNC(MultiPassive)
+IMPLEMENT_CALLBACK_FUNC(InitContext)
+IMPLEMENT_CALLBACK_FUNC(AppStatus)
+
+
+
+/*
+ * Sets the Display callback for the current window
+ */
+void FGAPIENTRY glutDisplayFunc( FGCBDisplay callback )
+{
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutDisplayFunc" );
+    if( !callback )
+        fgError( "Fatal error in program.  NULL display callback not "
+                 "permitted in GLUT 3.0+ or freeglut 2.0.1+" );
+    SET_CALLBACK( Display );
+}
+
+void fghDefaultReshape(int width, int height)
+{
+    glViewport( 0, 0, width, height );
+}
+
+void FGAPIENTRY glutReshapeFunc( FGCBReshape callback )
+{
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutReshapeFunc" );
+    
+    if( !callback )
+        callback = fghDefaultReshape;
+
+    SET_CALLBACK( Reshape );
+}
+
+/*
+ * Sets the Visibility callback for the current window.
+ * NB: the Visibility func is deprecated in favor of the WindowStatus func,
+ * which provides more detail. The visibility func callback is implemented
+ * as a translation step from the windowStatus func. When the user sets the
+ * windowStatus func, any visibility func is overwritten.
+ * DEVELOPER NOTE: in the library, only invoke the window status func, this
+ * gets automatically translated to the visibility func if thats what the
+ * user has set.
+ * window status is kind of anemic on win32 as there are no window messages
+ * to notify us that the window is covered by other windows or not.
+ * Should one want to query this, see
+ * http://stackoverflow.com/questions/5445889/get-which-process-window-is-actually-visible-in-c-sharp
+ * for an implementation outline (but it would be polling based, not push based).
+ */
+static void fghVisibility( int status )
+{
+    int vis_status;
+
+    FREEGLUT_INTERNAL_ERROR_EXIT_IF_NOT_INITIALISED ( "Visibility Callback" );
+    freeglut_return_if_fail( fgStructure.CurrentWindow );
+
+    /* Translate window status func states to visibility states */
+    if( ( GLUT_HIDDEN == status )  || ( GLUT_FULLY_COVERED == status ) )
+        vis_status = GLUT_NOT_VISIBLE;
+    else    /* GLUT_FULLY_RETAINED, GLUT_PARTIALLY_RETAINED */
+        vis_status = GLUT_VISIBLE;
+
+    INVOKE_WCB( *( fgStructure.CurrentWindow ), Visibility, ( vis_status ) );
+}
+
+void FGAPIENTRY glutVisibilityFunc( FGCBVisibility callback )
+{
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutVisibilityFunc" );
+    SET_CALLBACK( Visibility );
+
+    if( callback )
+        glutWindowStatusFunc( fghVisibility );
+    else
+        glutWindowStatusFunc( NULL );
+}
+
+/*
+ * Sets the joystick callback and polling rate for the current window
+ */
+void FGAPIENTRY glutJoystickFunc( FGCBJoystick callback, int pollInterval )
+{
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutJoystickFunc" );
+    fgInitialiseJoysticks ();
+
+    if ( (
+           fgStructure.CurrentWindow->State.JoystickPollRate <= 0 ||        /* Joystick callback was disabled */
+           !FETCH_WCB(*fgStructure.CurrentWindow,Joystick)
+         ) &&
+         ( 
+           callback && ( pollInterval > 0 )                                 /* but is now enabled */
+         ) )
+        ++fgState.NumActiveJoysticks;
+    else if ( ( 
+                fgStructure.CurrentWindow->State.JoystickPollRate > 0 &&    /* Joystick callback was enabled */
+                FETCH_WCB(*fgStructure.CurrentWindow,Joystick)
+              ) &&  
+              ( 
+                !callback || ( pollInterval <= 0 )                          /* but is now disabled */
+              ) )
+        --fgState.NumActiveJoysticks;
+
+    SET_CALLBACK( Joystick );
+    fgStructure.CurrentWindow->State.JoystickPollRate = pollInterval;
+
+    /* set last poll time such that joystick will be polled asap */
+    fgStructure.CurrentWindow->State.JoystickLastPoll = fgElapsedTime();
+    if (fgStructure.CurrentWindow->State.JoystickLastPoll < pollInterval)
+        fgStructure.CurrentWindow->State.JoystickLastPoll = 0;
+    else
+        fgStructure.CurrentWindow->State.JoystickLastPoll -= pollInterval;
+}
+
+
+
+/*
+ * Sets the spaceball motion callback for the current window
+ */
+void FGAPIENTRY glutSpaceballMotionFunc( FGCBSpaceMotion callback )
+{
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSpaceballMotionFunc" );
+    fgInitialiseSpaceball();
+
+    SET_CALLBACK( SpaceMotion );
+}
+
+/*
+ * Sets the spaceball rotate callback for the current window
+ */
+void FGAPIENTRY glutSpaceballRotateFunc( FGCBSpaceRotation callback )
+{
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSpaceballRotateFunc" );
+    fgInitialiseSpaceball();
+
+    SET_CALLBACK( SpaceRotation );
+}
+
+/*
+ * Sets the spaceball button callback for the current window
+ */
+void FGAPIENTRY glutSpaceballButtonFunc( FGCBSpaceButton callback )
+{
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSpaceballButtonFunc" );
+    fgInitialiseSpaceball();
+
+    SET_CALLBACK( SpaceButton );
+}
+
+/*** END OF FILE ***/