proper wheel delta

hw3d/Mouse.cpp

@@ -19,7 +19,7 @@
  *	along with The Chili DirectX Framework.  If not, see <http://www.gnu.org/licenses/>.  *
  ******************************************************************************************/
 #include "Mouse.h"
-
+#include <Windows.h>
 
 std::pair<int,int> Mouse::GetPos() const noexcept
 {
@@ -144,3 +144,19 @@ void Mouse::TrimBuffer() noexcept
 		buffer.pop();
 	}
 }
+
+void Mouse::OnWheelDelta( int x,int y,int delta ) noexcept
+{
+	wheelDeltaCarry += delta;
+	// generate events for every 120 
+	while( wheelDeltaCarry >= WHEEL_DELTA )
+	{
+		wheelDeltaCarry -= WHEEL_DELTA;
+		OnWheelUp( x,y );
+	}
+	while( wheelDeltaCarry <= -WHEEL_DELTA )
+	{
+		wheelDeltaCarry += WHEEL_DELTA;
+		OnWheelDown( x,y );
+	}
+}

hw3d/Mouse.h

@@ -120,6 +120,7 @@ private:
 	void OnWheelUp( int x,int y ) noexcept;
 	void OnWheelDown( int x,int y ) noexcept;
 	void TrimBuffer() noexcept;
+	void OnWheelDelta( int x,int y,int delta ) noexcept;
 private:
 	static constexpr unsigned int bufferSize = 16u;
 	int x;
@@ -127,5 +128,6 @@ private:
 	bool leftIsPressed = false;
 	bool rightIsPressed = false;
 	bool isInWindow = false;
+	int wheelDeltaCarry = 0;
 	std::queue<Event> buffer;
 };
\ No newline at end of file

hw3d/Window.cpp

@@ -240,14 +240,8 @@ LRESULT Window::HandleMsg( HWND hWnd,UINT msg,WPARAM wParam,LPARAM lParam ) noex
 	case WM_MOUSEWHEEL:
 	{
 		const POINTS pt = MAKEPOINTS( lParam );
-		if( GET_WHEEL_DELTA_WPARAM( wParam ) > 0 )
-		{
-			mouse.OnWheelUp( pt.x,pt.y );
-		}
-		else if( GET_WHEEL_DELTA_WPARAM( wParam ) < 0 )
-		{
-			mouse.OnWheelDown( pt.x,pt.y );
-		}
+		const int delta = GET_WHEEL_DELTA_WPARAM( wParam );
+		mouse.OnWheelDelta( pt.x,pt.y,delta );
 		break;
 	}
 	/************** END MOUSE MESSAGES **************/