Revive mouse wheel on SDL2

1 files changed, 7 insertions, 4 deletions

diff --git a/indra/llwindow/llwindowsdl.cpp b/indra/llwindow/llwindowsdl.cpp
index 11605804c0..ff4b8aa556 100644
--- a/indra/llwindow/llwindowsdl.cpp
+++ b/indra/llwindow/llwindowsdl.cpp
@@ -1903,14 +1903,17 @@ void LLWindowSDL::gatherInput()
 				{
 				    mCallbacks->handleMiddleMouseDown(this, openGlCoord, mask);
 				}
-                else if (event.button.button == 4)  // mousewheel up...thanks to X11 for making SDL consider these "buttons".
-					mCallbacks->handleScrollWheel(this, -1);
-                else if (event.button.button == 5)  // mousewheel down...thanks to X11 for making SDL consider these "buttons".
-					mCallbacks->handleScrollWheel(this, 1);
 
                 break;
             }
 
+            case SDL_MOUSEWHEEL:
+                if (event.wheel.y > 0)  // mousewheel up
+					mCallbacks->handleScrollWheel(this, -1);
+                else if (event.wheel.y < 0)  // mousewheel down
+					mCallbacks->handleScrollWheel(this, 1);
+                break;
+
             case SDL_MOUSEBUTTONUP:
             {
                 LLCoordWindow winCoord(event.button.x, event.button.y);