2 files changed, 71 insertions, 0 deletions
diff --git a/tests/glut_wheelevents.c b/tests/glut_wheelevents.c
new file mode 100644
index 00000000..7be01636
--- /dev/null
+++ b/tests/glut_wheelevents.c
@@ -0,0 +1,68 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <GL/glut.h>
+#include <EGL/egl.h>
+#include <emscripten.h>
+
+#define MULTILINE(...) #__VA_ARGS__
+
+int wheel_up = 0;
+int wheel_down = 0;
+
+int result = 0;
+
+void mouseCB(int button, int state, int x, int y)
+{
+    if(button == 3)
+    {
+      wheel_up = 1;   
+    }
+    else if (button == 4)
+    {
+      wheel_down = 1;
+    }
+}
+
+int main(int argc, char *argv[])
+{
+    emscripten_run_script(MULTILINE(
+        Module.injectWheelEvent = function(x, y, delta) {
+            var isFirefox = navigator.userAgent.toLowerCase().indexOf('firefox') > -1;
+            var event = document.createEvent("MouseEvents");
+            if (!isFirefox) {
+            // mouse wheel event for IE9, Chrome, Safari, Opera
+            event.initMouseEvent('mousewheel', true, true, window,
+                                 0, Module['canvas'].offsetLeft + x, Module['canvas'].offsetTop + y, Module['canvas'].offsetLeft + x, Module['canvas'].offsetTop + y,
+                                 0, 0, 0, 0, 0, null);
+                                 event.wheelDelta = delta;
+            } else {
+              // mouse wheel event for Firefox, the delta sign is inversed for that browser and is stored in the detail property of the mouse event
+              event.initMouseEvent('DOMMouseScroll', true, true, window,
+                                   -delta, Module['canvas'].offsetLeft + x, Module['canvas'].offsetTop + y, Module['canvas'].offsetLeft + x, Module['canvas'].offsetTop + y,
+                                   0, 0, 0, 0, 0, null);
+            }
+            Module['canvas'].dispatchEvent(event);
+        }
+    ));
+
+    
+    glutInit(&argc, argv);
+
+    glutMouseFunc(&mouseCB);
+    
+    // inject wheel up event (delta > 0)
+    emscripten_run_script("Module.injectWheelEvent(100, 100, 1)");
+    if (wheel_up) {
+      printf("%s\n", "mouse wheel up event received");
+    }
+    // inject wheel down event (delta < 0)
+    emscripten_run_script("Module.injectWheelEvent(100, 100, -1)");
+    if (wheel_down) {
+      printf("%s\n", "mouse wheel down event received");
+    }
+    
+    result = wheel_up && wheel_down;
+  
+    REPORT_RESULT();
+    return 0;
+}
diff --git a/tests/test_browser.py b/tests/test_browser.py
index 799759a1..f4e4b89a 100644
--- a/tests/test_browser.py
+++ b/tests/test_browser.py
@@ -866,6 +866,9 @@ keydown(100);keyup(100); // trigger the end
   def test_glut_touchevents(self):
     self.btest('glut_touchevents.c', '1')
 
+  def test_glut_wheelevents(self):
+    self.btest('glut_wheelevents.c', '1')
+
   def test_emscripten_get_now(self):
     self.btest('emscripten_get_now.cpp', '1')