6 files changed, 9 insertions, 0 deletions
diff --git a/indra/llwindow/llwindow.h b/indra/llwindow/llwindow.h
index d0fa16b26a..7a5404e615 100644
--- a/indra/llwindow/llwindow.h
+++ b/indra/llwindow/llwindow.h
@@ -95,6 +95,7 @@ public:
 #if LL_WINDOWS
     virtual bool getCursorDelta(LLCoordCommon* delta) = 0;
 #endif
+    virtual bool isWrapMouse() const = 0;
     virtual void showCursor() = 0;
     virtual void hideCursor() = 0;
     virtual bool isCursorHidden() = 0;
diff --git a/indra/llwindow/llwindowheadless.h b/indra/llwindow/llwindowheadless.h
index 5696b69a59..dc7b833013 100644
--- a/indra/llwindow/llwindowheadless.h
+++ b/indra/llwindow/llwindowheadless.h
@@ -63,6 +63,7 @@ public:
 #if LL_WINDOWS
     /*virtual*/ bool getCursorDelta(LLCoordCommon* delta) override { return false; }
 #endif
+    /*virtual*/ bool isWrapMouse() const override { return true; }
     /*virtual*/ void showCursor() override {}
     /*virtual*/ void hideCursor() override {}
     /*virtual*/ void showCursorFromMouseMove() override {}
diff --git a/indra/llwindow/llwindowmacosx.h b/indra/llwindow/llwindowmacosx.h
index 110c5756d0..d703a84d02 100644
--- a/indra/llwindow/llwindowmacosx.h
+++ b/indra/llwindow/llwindowmacosx.h
@@ -63,6 +63,7 @@ public:
     bool switchContext(bool fullscreen, const LLCoordScreen &size, bool enable_vsync, const LLCoordScreen * const posp = NULL) override;
     bool setCursorPosition(LLCoordWindow position) override;
     bool getCursorPosition(LLCoordWindow *position) override;
+    bool isWrapMouse() const override { return !mCursorDecoupled; };
     void showCursor() override;
     void hideCursor() override;
     void showCursorFromMouseMove() override;
diff --git a/indra/llwindow/llwindowsdl.h b/indra/llwindow/llwindowsdl.h
index 196ad2986d..521d52df30 100644
--- a/indra/llwindow/llwindowsdl.h
+++ b/indra/llwindow/llwindowsdl.h
@@ -68,6 +68,7 @@ public:
     /*virtual*/ bool switchContext(bool fullscreen, const LLCoordScreen &size, bool disable_vsync, const LLCoordScreen * const posp = NULL);
     /*virtual*/ bool setCursorPosition(LLCoordWindow position);
     /*virtual*/ bool getCursorPosition(LLCoordWindow *position);
+    /*virtual*/ bool isWrapMouse() const override { return true; }
     /*virtual*/ void showCursor();
     /*virtual*/ void hideCursor();
     /*virtual*/ void showCursorFromMouseMove();
diff --git a/indra/llwindow/llwindowwin32.cpp b/indra/llwindow/llwindowwin32.cpp
index 23d5866710..824d0f5ec6 100644
--- a/indra/llwindow/llwindowwin32.cpp
+++ b/indra/llwindow/llwindowwin32.cpp
@@ -450,6 +450,7 @@ LLWindowWin32::LLWindowWin32(LLWindowCallbacks* callbacks,
                              F32 max_gl_version)
     :
     LLWindow(callbacks, fullscreen, flags),
+    mAbsoluteCursorPosition(false),
     mMaxGLVersion(max_gl_version),
     mMaxCores(max_cores)
 {
@@ -3156,6 +3157,7 @@ LRESULT CALLBACK LLWindowWin32::mainWindowProc(HWND h_wnd, UINT u_msg, WPARAM w_
 
                         prev_absolute_x = absolute_x;
                         prev_absolute_y = absolute_y;
+                        window_imp->mAbsoluteCursorPosition = true;
                     }
                     else
                     {
@@ -3172,6 +3174,7 @@ LRESULT CALLBACK LLWindowWin32::mainWindowProc(HWND h_wnd, UINT u_msg, WPARAM w_
                             window_imp->mRawMouseDelta.mX += (S32)round((F32)raw->data.mouse.lLastX * (F32)speed / DEFAULT_SPEED);
                             window_imp->mRawMouseDelta.mY -= (S32)round((F32)raw->data.mouse.lLastY * (F32)speed / DEFAULT_SPEED);
                         }
+                        window_imp->mAbsoluteCursorPosition = false;
                     }
                 }
             }
diff --git a/indra/llwindow/llwindowwin32.h b/indra/llwindow/llwindowwin32.h
index 7196706f87..0fc93ad0b1 100644
--- a/indra/llwindow/llwindowwin32.h
+++ b/indra/llwindow/llwindowwin32.h
@@ -70,6 +70,7 @@ public:
     /*virtual*/ bool setCursorPosition(LLCoordWindow position);
     /*virtual*/ bool getCursorPosition(LLCoordWindow *position);
     /*virtual*/ bool getCursorDelta(LLCoordCommon* delta);
+    /*virtual*/ bool isWrapMouse() const override { return !mAbsoluteCursorPosition; };
     /*virtual*/ void showCursor();
     /*virtual*/ void hideCursor();
     /*virtual*/ void showCursorFromMouseMove();
@@ -195,6 +196,7 @@ protected:
 
     HCURSOR     mCursor[ UI_CURSOR_COUNT ];  // Array of all mouse cursors
     LLCoordWindow mCursorPosition;  // mouse cursor position, should only be mutated on main thread
+    bool        mAbsoluteCursorPosition; // true if last position was received in absolute coordinates.
     LLMutex mRawMouseMutex;
     RAWINPUTDEVICE mRawMouse;
     LLCoordWindow mLastCursorPosition; // mouse cursor position from previous frame