--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/freeglut/progs/demos/multi-touch/multi-touch.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,163 @@
+/**
+ * Sample multi-touch program that displays a square where a cursor
+ * clicks, with a different color for each cursor.
+ *
+ * Copyright (C) 2012  Sylvain Beucler
+ * 
+ * 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 THE AUTHORS OR COPYRIGHT HOLDERS
+ * 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <GL/freeglut.h>
+#include <GL/gl.h>
+
+#define NUM_DEVICES 16
+#define NUM_CURSORS 64
+typedef struct cursor {
+    char on;
+    float x;
+    float y;
+} *Cursor;
+struct cursor cursors[NUM_DEVICES][NUM_CURSORS];
+
+
+static float square[] = {
+        -.5, -.5,
+         .5, -.5,
+        -.5,  .5,
+         .5,  .5,
+    };
+
+void onDisplay(void) {
+    int d;
+    glClearColor(0,0,0,1);
+    glClear(GL_COLOR_BUFFER_BIT);
+
+    glEnableClientState(GL_VERTEX_ARRAY);
+    glVertexPointer(2, GL_FLOAT, 0, square);
+    for (d = 0; d < NUM_DEVICES; d++) {
+        int c;
+        for (c = 0; d < NUM_DEVICES; d++) {
+            Cursor C = &cursors[d][c];
+            if (C->on) {
+                glMatrixMode(GL_MODELVIEW);
+                glLoadIdentity();
+                glTranslatef(C->x, C->y, 0);
+                glScalef(30, 30, 1);
+                
+                switch(c) {
+                case 0:
+                    glColor4f(0,0,1,1);
+                    break;
+                case 1:
+                    glColor4f(0,1,0,1);
+                    break;
+                case 2:
+                    glColor4f(1,0,0,1);
+                    break;
+                case 3:
+                    glColor4f(1,1,1,1);
+                    break;
+                default:
+                    glColor4d(.5,.5,.5,1);
+                    break;
+                }
+                glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+            }
+        }
+    }
+    glDisableClientState(GL_VERTEX_ARRAY);
+
+    glutSwapBuffers();
+}
+
+void onMouse(int button, int state, int x, int y) {
+    if (button == 0) {
+        cursors[0][0].on = (state == GLUT_DOWN);
+        cursors[0][0].x = (float)x;
+        cursors[0][0].y = (float)y;
+        printf("normal click\n");
+    }
+}
+
+void onMotion(int x, int y) {
+    cursors[0][0].x = (float)x;
+    cursors[0][0].y = (float)y;
+}
+
+/* Using FG2.8 (reversed) prototype for now */
+/* void onMultiButton(int cursor_id, int button, int state, int x, int y) { */
+void onMultiButton(int cursor_id, int x, int y, int button, int state) {
+    if (cursor_id > NUM_CURSORS) {
+        fprintf(stderr, "cursor_id(%d) > NUM_CURSORS(%d)\n", cursor_id, NUM_CURSORS);
+        return;
+    }
+    if (button == 0) {
+        cursors[0][cursor_id].on = (state == GLUT_DOWN);
+        cursors[0][cursor_id].x = (float)x;
+        cursors[0][cursor_id].y = (float)y;
+        printf("multi-touch %d click\n", cursor_id);
+    }
+}
+
+void onMultiMotion(int cursor_id, int x, int y) {
+    if (cursor_id > NUM_CURSORS) {
+        fprintf(stderr, "cursor_id(%d) > NUM_CURSORS(%d)\n", cursor_id, NUM_CURSORS);
+        return;
+    }
+    cursors[0][cursor_id].x = (float)x;
+    cursors[0][cursor_id].y = (float)y;
+}
+
+void onReshape(int width, int height) {
+    glViewport(0, 0, width, height);
+    
+    glMatrixMode(GL_PROJECTION);
+    glOrtho(0, width, height, 0, -1, 1);
+}
+
+void onIdle(void) {
+    glutPostRedisplay();
+}
+
+int main(int argc, char* argv[]) {
+    memset(cursors, 0, sizeof(cursors));
+
+    glutInit(&argc, argv);
+    glutInitDisplayMode(GLUT_RGB|GLUT_DOUBLE);
+    glutInitWindowSize(640, 480);
+    glutCreateWindow("Multi-touch test");
+
+    glutDisplayFunc(onDisplay);
+    glutReshapeFunc(onReshape);
+    glutIdleFunc(onIdle);
+    glutMouseFunc(onMouse);
+    glutMotionFunc(onMotion);
+    glutMultiButtonFunc(onMultiButton);
+    glutMultiMotionFunc(onMultiMotion);
+
+    glutMainLoop();
+
+    return EXIT_SUCCESS;
+}