From 7b938c6b08b2a0365af1e248f52053a9de0031dd Mon Sep 17 00:00:00 2001
From: Camilla Berglund <elmindreda@users.sourceforge.net>
Date: Mon, 27 Sep 2010 02:32:41 +0200
Subject: [PATCH] Added Win32 implementation of two-dimensional scrolling.

---
 src/win32/platform.h     |  3 +++
 src/win32/win32_window.c | 19 +++++++++++++------
 2 files changed, 16 insertions(+), 6 deletions(-)
 mode change 100644 => 100755 src/win32/win32_window.c

diff --git a/src/win32/platform.h b/src/win32/platform.h
index 112afb11..8a2a2ffa 100755
--- a/src/win32/platform.h
+++ b/src/win32/platform.h
@@ -120,6 +120,9 @@ typedef struct tagKBDLLHOOKSTRUCT {
 #ifndef WHEEL_DELTA
 #define WHEEL_DELTA 120
 #endif
+#ifndef WM_MOUSEHWHEEL
+#define WM_MOUSEHWHEEL 0x020E
+#endif
 
 #ifndef WM_XBUTTONDOWN
 #define WM_XBUTTONDOWN 0x020B
diff --git a/src/win32/win32_window.c b/src/win32/win32_window.c
old mode 100644
new mode 100755
index 8ac59203..231dd562
--- a/src/win32/win32_window.c
+++ b/src/win32/win32_window.c
@@ -622,8 +622,6 @@ static void translateChar(_GLFWwindow* window, DWORD wParam, DWORD lParam)
 static LRESULT CALLBACK windowProc(HWND hWnd, UINT uMsg,
                                    WPARAM wParam, LPARAM lParam)
 {
-    int wheelDelta;
-
     _GLFWwindow* window = (_GLFWwindow*) GetWindowLongPtr(hWnd, 0);
 
     switch (uMsg)
@@ -880,12 +878,15 @@ static LRESULT CALLBACK windowProc(HWND hWnd, UINT uMsg,
 
         case WM_MOUSEWHEEL:
         {
-            wheelDelta = (((int)wParam) >> 16) / WHEEL_DELTA;
-            window->wheelPos += wheelDelta;
+            _glfwInputScroll(window, 0, (((int) wParam) >> 16) / WHEEL_DELTA);
+            return 0;
+        }
 
-            if (window->mouseWheelCallback)
-                window->mouseWheelCallback(window, window->wheelPos);
+        case WM_MOUSEHWHEEL:
+        {
+            // This message is only sent on Windows Vista and later
 
+            _glfwInputScroll(window, (((int) wParam) >> 16) / WHEEL_DELTA, 0);
             return 0;
         }
 
@@ -1635,6 +1636,12 @@ void _glfwPlatformPollEvents(void)
     MSG msg;
     _GLFWwindow* window;
 
+    for (window = _glfwLibrary.windowListHead;  window;  window = window->next)
+    {
+        window->scrollX = 0;
+        window->scrollY = 0;
+    }
+
     window = _glfwLibrary.cursorLockWindow;
     if (window)
     {