raw mouse input

hw3d/App.cpp

@@ -34,6 +34,7 @@ void App::DoFrame()
 	light.SpawnControlWindow();
 	ShowImguiDemoWindow();
 	nano.ShowWindow();
+	ShowRawInputWindow();
 
 	// present
 	wnd.Gfx().EndFrame();
@@ -48,6 +49,20 @@ void App::ShowImguiDemoWindow()
 	}
 }
 
+void App::ShowRawInputWindow()
+{
+	while( const auto d = wnd.mouse.ReadRawDelta() )
+	{
+		x += d->x;
+		y += d->y;
+	}
+	if( ImGui::Begin( "Raw Input" ) )
+	{
+		ImGui::Text( "Tally: (%d,%d)",x,y );
+	}
+	ImGui::End();
+}
+
 App::~App()
 {}
 

hw3d/App.h

@@ -17,7 +17,9 @@ public:
 private:
 	void DoFrame();
 	void ShowImguiDemoWindow();
+	void ShowRawInputWindow();
 private:
+	int x = 0,y = 0;
 	ImguiManager imgui;
 	Window wnd;
 	ChiliTimer timer;

hw3d/Mouse.cpp

@@ -21,11 +21,23 @@
 #include "ChiliWin.h"
 #include "Mouse.h"
 
+
 std::pair<int,int> Mouse::GetPos() const noexcept
 {
 	return { x,y };
 }
 
+std::optional<Mouse::RawDelta> Mouse::ReadRawDelta() noexcept
+{
+	if( rawDeltaBuffer.empty() )
+	{
+		return std::nullopt;
+	}
+	const RawDelta d = rawDeltaBuffer.front();
+	rawDeltaBuffer.pop();
+	return d;
+}
+
 int Mouse::GetPosX() const noexcept
 {
 	return x;
@@ -90,6 +102,12 @@ void Mouse::OnMouseEnter() noexcept
 	TrimBuffer();
 }
 
+void Mouse::OnRawDelta( int dx,int dy ) noexcept
+{
+	rawDeltaBuffer.push( { dx,dy } );
+	TrimBuffer();
+}
+
 void Mouse::OnLeftPressed( int x,int y ) noexcept
 {
 	leftIsPressed = true;
@@ -142,6 +160,14 @@ void Mouse::TrimBuffer() noexcept
 	}
 }
 
+void Mouse::TrimRawInputBuffer() noexcept
+{
+	while( rawDeltaBuffer.size() > bufferSize )
+	{
+		rawDeltaBuffer.pop();
+	}
+}
+
 void Mouse::OnWheelDelta( int x,int y,int delta ) noexcept
 {
 	wheelDeltaCarry += delta;

hw3d/Mouse.h

@@ -26,6 +26,10 @@ class Mouse
 {
 	friend class Window;
 public:
+	struct RawDelta
+	{
+		int x,y;
+	};
 	class Event
 	{
 	public:
@@ -86,6 +90,7 @@ public:
 	Mouse( const Mouse& ) = delete;
 	Mouse& operator=( const Mouse& ) = delete;
 	std::pair<int,int> GetPos() const noexcept;
+	std::optional<RawDelta> ReadRawDelta() noexcept;
 	int GetPosX() const noexcept;
 	int GetPosY() const noexcept;
 	bool IsInWindow() const noexcept;
@@ -101,6 +106,7 @@ private:
 	void OnMouseMove( int x,int y ) noexcept;
 	void OnMouseLeave() noexcept;
 	void OnMouseEnter() noexcept;
+	void OnRawDelta( int dx,int dy ) noexcept;
 	void OnLeftPressed( int x,int y ) noexcept;
 	void OnLeftReleased( int x,int y ) noexcept;
 	void OnRightPressed( int x,int y ) noexcept;
@@ -108,6 +114,7 @@ private:
 	void OnWheelUp( int x,int y ) noexcept;
 	void OnWheelDown( int x,int y ) noexcept;
 	void TrimBuffer() noexcept;
+	void TrimRawInputBuffer() noexcept;
 	void OnWheelDelta( int x,int y,int delta ) noexcept;
 private:
 	static constexpr unsigned int bufferSize = 16u;
@@ -118,4 +125,5 @@ private:
 	bool isInWindow = false;
 	int wheelDeltaCarry = 0;
 	std::queue<Event> buffer;
+	std::queue<RawDelta> rawDeltaBuffer;
 };
\ No newline at end of file

hw3d/Window.cpp

@@ -103,6 +103,16 @@ Window::Window( int width,int height,const char* name )
 	ImGui_ImplWin32_Init( hWnd );
 	// create graphics object
 	pGfx = std::make_unique<Graphics>( hWnd,width,height );
+	// register mouse raw input device
+	RAWINPUTDEVICE rid;
+	rid.usUsagePage = 0x01; // mouse page
+	rid.usUsage = 0x02; // mouse usage
+	rid.dwFlags = 0;
+	rid.hwndTarget = nullptr;
+	if( RegisterRawInputDevices( &rid,1,sizeof( rid ) ) == FALSE )
+	{
+		throw CHWND_LAST_EXCEPT();
+	}
 }
 
 Window::~Window()
@@ -416,6 +426,44 @@ LRESULT Window::HandleMsg( HWND hWnd,UINT msg,WPARAM wParam,LPARAM lParam ) noex
 		break;
 	}
 	/************** END MOUSE MESSAGES **************/
+	
+	/************** RAW MOUSE MESSAGES **************/
+	case WM_INPUT:
+	{
+		UINT size;
+		// first get the size of the input data
+		if( GetRawInputData(
+			reinterpret_cast<HRAWINPUT>(lParam),
+			RID_INPUT,
+			nullptr,
+			&size,
+			sizeof( RAWINPUTHEADER ) ) == -1)
+		{
+			// bail msg processing if error
+			break;
+		}
+		rawBuffer.resize( size );
+		// read in the input data
+		if( GetRawInputData(
+			reinterpret_cast<HRAWINPUT>(lParam),
+			RID_INPUT,
+			rawBuffer.data(),
+			&size,
+			sizeof( RAWINPUTHEADER ) ) != size )
+		{
+			// bail msg processing if error
+			break;
+		}
+		// process the raw input data
+		auto& ri = reinterpret_cast<const RAWINPUT&>(*rawBuffer.data());
+		if( ri.header.dwType == RIM_TYPEMOUSE &&
+			(ri.data.mouse.lLastX != 0 || ri.data.mouse.lLastY != 0) )
+		{
+			mouse.OnRawDelta( ri.data.mouse.lLastX,ri.data.mouse.lLastY );
+		}
+		break;
+	}
+	/************** END RAW MOUSE MESSAGES **************/
 	}
 
 	return DefWindowProc( hWnd,msg,wParam,lParam );

hw3d/Window.h

@@ -93,9 +93,10 @@ public:
 	Keyboard kbd;
 	Mouse mouse;
 private:
-	bool cursorEnabled = false;
+	bool cursorEnabled = true;
 	int width;
 	int height;
 	HWND hWnd;
 	std::unique_ptr<Graphics> pGfx;
+	std::vector<BYTE> rawBuffer;
 };