--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/freeglut/progs/demos/subwin/subwin.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,235 @@
+/*! \file    subwin.c
+    \ingroup demos
+
+    This program is a test harness for the subwindows
+    in OpenGLUT.  Based Originally on shape.c demo.
+ 
+    \author  Written by Evan Felix February 2011
+
+    \author  Portions Copyright (C) 2004, the OpenGLUT project contributors. <br>
+             OpenGLUT branched from freeglut in February, 2004.
+ 
+    \image   html openglut_subwin.png OpenGLUT Sub Window Demonstration
+    \include demos/subwin/subwin.c
+*/
+
+#include <GL/freeglut.h>
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#ifdef _MSC_VER
+/* DUMP MEMORY LEAKS */
+#include <crtdbg.h>
+#endif
+
+#define MAXSTR 16
+char **strings;
+int mainwin;
+
+
+/*!
+    Does printf()-like work using freeglut/OpenGLUT
+    glutBitmapString().  Uses a fixed font.  Prints
+    at the indicated row/column position.
+
+    Limitation: Cannot address pixels.
+    Limitation: Renders in screen coords, not model coords.
+*/
+static void shapesPrintf (int row, int col, const char *fmt, ...)
+{
+    static char buf[256];
+    int viewport[4];
+    void *font = GLUT_BITMAP_9_BY_15;
+    va_list args;
+
+    va_start(args, fmt);
+#if defined(WIN32) && !defined(__CYGWIN__)
+    (void) _vsnprintf (buf, sizeof(buf), fmt, args);
+#else
+    (void) vsnprintf (buf, sizeof(buf), fmt, args);
+#endif
+    va_end(args);
+
+    glGetIntegerv(GL_VIEWPORT,viewport);
+
+    glPushMatrix();
+    glLoadIdentity();
+
+    glMatrixMode(GL_PROJECTION);
+    glPushMatrix();
+    glLoadIdentity();
+
+        glOrtho(0,viewport[2],0,viewport[3],-1,1);
+
+        glRasterPos2i
+        (
+              glutBitmapWidth(font, ' ') * col,
+            - glutBitmapHeight(font) * (row+2) + viewport[3]
+        );
+        glutBitmapString (font, (unsigned char*)buf);
+
+    glPopMatrix();
+    glMatrixMode(GL_MODELVIEW);
+    glPopMatrix();
+}
+
+/* GLUT callback Handlers */
+
+static void
+resize(int width, int height)
+{
+
+    glViewport(0, 0, width, height);
+
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+	/*gluOrtho2D(0, width, 0, height);*/
+
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity() ;
+}
+
+static void display(void)
+{
+
+	int win = glutGetWindow();
+ 
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    glColor3d(1,0,0);
+
+    glDisable(GL_LIGHTING);
+    glColor3d(0.1,0.1,0.4);
+
+	if (win == mainwin)
+    {
+	    shapesPrintf (2, 3, "Move The mouse into different windows");
+	    shapesPrintf (3, 3, "pressing keys will add to the string");
+        shapesPrintf (5, 3, "Window: %d", win);
+        shapesPrintf (6, 3, "String: %s", strings[win]);
+    }
+    else
+    {
+        shapesPrintf (1, 3, "Window: %d", win);
+        shapesPrintf (2, 3, "String: %s", strings[win]);
+    }
+
+    glutSwapBuffers();
+}
+
+
+static void
+key(unsigned char key, int x, int y)
+{
+	char *s,str[2];
+	int win = glutGetWindow();
+	
+    switch (key)
+    {
+    case 27 :
+    case 'Q':
+    case 'q': glutLeaveMainLoop () ;      break;
+
+    default:
+    	s=strings[win];
+        if (strlen(s)+1>MAXSTR) {
+        	s[0]=0;
+        }
+        str[0]=key;
+        str[1]=0;
+        strcat(s,str);
+        break;
+    }
+
+    glutPostRedisplay();
+}
+
+static void special (int key, int x, int y)
+{
+    switch (key)
+    {
+    default:
+        break;
+    }
+    glutPostRedisplay();
+}
+
+
+static void
+entry(int state)
+{
+    int win = glutGetWindow();
+    printf("Win: %d, state: %d\n",win,state);
+}
+
+/* Program entry point */
+
+int
+main(int argc, char *argv[])
+{
+	int winmax,sw1,sw2,sw2sw,i;
+	
+    glutInitWindowSize(640,480);
+    glutInitWindowPosition(40,40);
+    glutInit(&argc, argv);
+    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH | GLUT_MULTISAMPLE);
+
+    glutCreateWindow("FreeGLUT Sub Windows");
+
+    glutReshapeFunc(resize);
+    glutDisplayFunc(display);
+    glutKeyboardFunc(key);
+    glutSpecialFunc(special);
+    glutEntryFunc(entry);
+
+    glutSetOption ( GLUT_ACTION_ON_WINDOW_CLOSE, GLUT_ACTION_CONTINUE_EXECUTION ) ;
+
+    glClearColor(1,1,1,1);
+
+	mainwin = glutGetWindow();
+	winmax=mainwin;
+	
+	sw1=glutCreateSubWindow(mainwin,4,240,314,236);
+    glutReshapeFunc(resize);
+    glutDisplayFunc(display);
+    glutKeyboardFunc(key);
+    glutSpecialFunc(special);
+    glutEntryFunc(entry);
+    glClearColor(0.7f,0.7f,0.7f,1);
+	winmax = sw1 > winmax ? sw1 : winmax;
+
+	sw2=glutCreateSubWindow(mainwin,322,240,314,236);
+    glutReshapeFunc(resize);
+    glutDisplayFunc(display);
+    glutKeyboardFunc(key);
+    glutSpecialFunc(special);
+    glutEntryFunc(entry);
+    glClearColor(0.7f,0.7f,0.7f,1);
+    winmax = sw2 > winmax ? sw2 : winmax;
+
+    sw2sw=glutCreateSubWindow(sw2,10,128,294,98);
+    glutReshapeFunc(resize);
+    glutDisplayFunc(display);
+    glutKeyboardFunc(key);
+    glutSpecialFunc(special);
+    glutEntryFunc(entry);
+    glClearColor(0.4f,0.4f,0.4f,1);
+    winmax = sw2sw > winmax ? sw2sw : winmax;
+
+	strings = malloc(sizeof(char *)*(winmax+1));
+	for (i=0;i<winmax+1;i++) {
+		strings[i] = malloc(sizeof(char)*MAXSTR+1);
+		strings[i][0]=0;
+	}
+
+    glutMainLoop();
+
+#ifdef _MSC_VER
+    /* DUMP MEMORY LEAK INFORMATION */
+    _CrtDumpMemoryLeaks () ;
+#endif
+
+    return EXIT_SUCCESS;
+}