feat: add support for keyboard and mouse input

Minecraft.Client/Windows64/KeyboardMouseInput.cpp

@@ -0,0 +1,217 @@
+#include "stdafx.h"
+
+#ifdef _WINDOWS64
+
+#include "KeyboardMouseInput.h"
+
+KeyboardMouseInput KMInput;
+
+KeyboardMouseInput::KeyboardMouseInput()
+	: m_mouseDeltaX(0.0f)
+	, m_mouseDeltaY(0.0f)
+	, m_mouseDeltaXAccum(0.0f)
+	, m_mouseDeltaYAccum(0.0f)
+	, m_scrollDelta(0)
+	, m_scrollDeltaAccum(0)
+	, m_captured(false)
+	, m_hWnd(NULL)
+	, m_initialized(false)
+{
+	memset(m_keyState, 0, sizeof(m_keyState));
+	memset(m_keyStatePrev, 0, sizeof(m_keyStatePrev));
+	memset(m_mouseButtons, 0, sizeof(m_mouseButtons));
+	memset(m_mouseButtonsPrev, 0, sizeof(m_mouseButtonsPrev));
+}
+
+KeyboardMouseInput::~KeyboardMouseInput()
+{
+	if (m_captured)
+	{
+		SetCapture(false);
+	}
+}
+
+void KeyboardMouseInput::Init(HWND hWnd)
+{
+	m_hWnd = hWnd;
+	m_initialized = true;
+
+	// Register for raw mouse input
+	RAWINPUTDEVICE rid;
+	rid.usUsagePage = HID_USAGE_PAGE_GENERIC;
+	rid.usUsage = HID_USAGE_GENERIC_MOUSE;
+	rid.dwFlags = 0;
+	rid.hwndTarget = hWnd;
+	RegisterRawInputDevices(&rid, 1, sizeof(rid));
+}
+
+void KeyboardMouseInput::Tick()
+{
+	// Snapshot accumulated mouse deltas
+	m_mouseDeltaX = m_mouseDeltaXAccum;
+	m_mouseDeltaY = m_mouseDeltaYAccum;
+	m_mouseDeltaXAccum = 0.0f;
+	m_mouseDeltaYAccum = 0.0f;
+
+	// Snapshot scroll delta
+	m_scrollDelta = m_scrollDeltaAccum;
+	m_scrollDeltaAccum = 0;
+
+	// Keep cursor pinned to center while captured
+	if (m_captured)
+		CenterCursor();
+}
+
+void KeyboardMouseInput::EndFrame()
+{
+	// Advance previous state for next frame's edge detection.
+	// Must be called AFTER all consumers have read IsKeyPressed/Released etc.
+	memcpy(m_keyStatePrev, m_keyState, sizeof(m_keyState));
+	memcpy(m_mouseButtonsPrev, m_mouseButtons, sizeof(m_mouseButtons));
+}
+
+void KeyboardMouseInput::OnKeyDown(WPARAM vk)
+{
+	if (vk < 256)
+	{
+		m_keyState[vk] = true;
+	}
+}
+
+void KeyboardMouseInput::OnKeyUp(WPARAM vk)
+{
+	if (vk < 256)
+	{
+		m_keyState[vk] = false;
+	}
+}
+
+void KeyboardMouseInput::OnRawMouseInput(LPARAM lParam)
+{
+	if (!m_captured) return;
+
+	UINT dwSize = 0;
+	GetRawInputData((HRAWINPUT)lParam, RID_INPUT, NULL, &dwSize, sizeof(RAWINPUTHEADER));
+
+	BYTE* lpb = (BYTE*)alloca(dwSize);
+	if (GetRawInputData((HRAWINPUT)lParam, RID_INPUT, lpb, &dwSize, sizeof(RAWINPUTHEADER)) != dwSize)
+		return;
+
+	RAWINPUT* raw = (RAWINPUT*)lpb;
+	if (raw->header.dwType == RIM_TYPEMOUSE)
+	{
+		if (raw->data.mouse.usFlags == MOUSE_MOVE_RELATIVE)
+		{
+			m_mouseDeltaXAccum += (float)raw->data.mouse.lLastX;
+			m_mouseDeltaYAccum += (float)raw->data.mouse.lLastY;
+		}
+	}
+}
+
+void KeyboardMouseInput::OnMouseButton(int button, bool down)
+{
+	if (button >= 0 && button < 3)
+	{
+		m_mouseButtons[button] = down;
+	}
+}
+
+void KeyboardMouseInput::OnMouseWheel(int delta)
+{
+	m_scrollDeltaAccum += delta;
+}
+
+void KeyboardMouseInput::ClearAllState()
+{
+	memset(m_keyState, 0, sizeof(m_keyState));
+	memset(m_mouseButtons, 0, sizeof(m_mouseButtons));
+	m_mouseDeltaXAccum = 0.0f;
+	m_mouseDeltaYAccum = 0.0f;
+	m_scrollDeltaAccum = 0;
+}
+
+// Key queries
+bool KeyboardMouseInput::IsKeyDown(int vk) const
+{
+	if (vk < 0 || vk >= 256) return false;
+	return m_keyState[vk];
+}
+
+bool KeyboardMouseInput::IsKeyPressed(int vk) const
+{
+	if (vk < 0 || vk >= 256) return false;
+	return m_keyState[vk] && !m_keyStatePrev[vk];
+}
+
+bool KeyboardMouseInput::IsKeyReleased(int vk) const
+{
+	if (vk < 0 || vk >= 256) return false;
+	return !m_keyState[vk] && m_keyStatePrev[vk];
+}
+
+// Mouse button queries
+bool KeyboardMouseInput::IsMouseDown(int btn) const
+{
+	if (btn < 0 || btn >= 3) return false;
+	return m_mouseButtons[btn];
+}
+
+bool KeyboardMouseInput::IsMousePressed(int btn) const
+{
+	if (btn < 0 || btn >= 3) return false;
+	return m_mouseButtons[btn] && !m_mouseButtonsPrev[btn];
+}
+
+bool KeyboardMouseInput::IsMouseReleased(int btn) const
+{
+	if (btn < 0 || btn >= 3) return false;
+	return !m_mouseButtons[btn] && m_mouseButtonsPrev[btn];
+}
+
+// Delta queries
+float KeyboardMouseInput::GetMouseDeltaX() const { return m_mouseDeltaX; }
+float KeyboardMouseInput::GetMouseDeltaY() const { return m_mouseDeltaY; }
+int KeyboardMouseInput::GetScrollDelta() const { return m_scrollDelta; }
+
+// Mouse capture
+void KeyboardMouseInput::SetCapture(bool capture)
+{
+	if (capture == m_captured) return;
+	m_captured = capture;
+
+	if (capture)
+	{
+		ShowCursor(FALSE);
+		RECT rect;
+		GetClientRect(m_hWnd, &rect);
+		POINT topLeft = { rect.left, rect.top };
+		POINT bottomRight = { rect.right, rect.bottom };
+		ClientToScreen(m_hWnd, &topLeft);
+		ClientToScreen(m_hWnd, &bottomRight);
+		RECT screenRect = { topLeft.x, topLeft.y, bottomRight.x, bottomRight.y };
+		ClipCursor(&screenRect);
+		CenterCursor();
+
+		// Flush accumulated deltas so the snap-to-center doesn't cause a jump
+		m_mouseDeltaXAccum = 0.0f;
+		m_mouseDeltaYAccum = 0.0f;
+	}
+	else
+	{
+		ShowCursor(TRUE);
+		ClipCursor(NULL);
+	}
+}
+
+bool KeyboardMouseInput::IsCaptured() const { return m_captured; }
+
+void KeyboardMouseInput::CenterCursor()
+{
+	RECT rect;
+	GetClientRect(m_hWnd, &rect);
+	POINT center = { (rect.left + rect.right) / 2, (rect.top + rect.bottom) / 2 };
+	ClientToScreen(m_hWnd, &center);
+	SetCursorPos(center.x, center.y);
+}
+
+#endif // _WINDOWS64