From 2d648c6cee55db3bf2f29d866303eb339571895a Mon Sep 17 00:00:00 2001
From: Riyyi <riyyi3@gmail.com>
Date: Tue, 24 Dec 2019 23:19:10 +0100
Subject: [PATCH] Add mouse offset to Input

---
 inferno/src/inferno/input.cpp | 31 +++++++++++++++++++++++++++++++
 inferno/src/inferno/input.h   | 19 +++++++++++++++++--
 2 files changed, 48 insertions(+), 2 deletions(-)

diff --git a/inferno/src/inferno/input.cpp b/inferno/src/inferno/input.cpp
index e07ee8f..23ff6ab 100644
--- a/inferno/src/inferno/input.cpp
+++ b/inferno/src/inferno/input.cpp
@@ -1,11 +1,42 @@
 #include <GLFW/glfw3.h>
 
 #include "inferno/application.h"
+#include "inferno/event/mouseevent.h"
 #include "inferno/input.h"
 #include "inferno/window.h"
 
 namespace Inferno {
 
+	bool Input::m_firstMousePos = true;
+	float Input::m_xPosLast = 0.0f;
+	float Input::m_yPosLast = 0.0f;
+	float Input::m_xOffset = 0.0f;
+	float Input::m_yOffset = 0.0f;
+
+	void Input::update()
+	{
+		m_xOffset = 0.0f;
+		m_yOffset = 0.0f;
+	}
+
+	bool Input::onMousePosition(MousePositionEvent &e)
+	{
+		// Prevent weird jump on first cursor window enter
+		if(m_firstMousePos) {
+			m_firstMousePos = false;
+			m_xPosLast = e.getXPos();
+			m_yPosLast = e.getYPos();
+		}
+
+		m_xOffset = e.getXPos() - m_xPosLast;
+		// Reversed since y-coordinates range from bottom to top
+		m_yOffset = m_yPosLast - e.getYPos();
+		m_xPosLast = e.getXPos();
+		m_yPosLast = e.getYPos();
+
+		return true;
+	}
+
 	bool Input::isKeyPressed(int key)
 	{
 		GLFWwindow* w = Application::get().getWindow().getWindow();
diff --git a/inferno/src/inferno/input.h b/inferno/src/inferno/input.h
index 2a132b1..bd5fb41 100644
--- a/inferno/src/inferno/input.h
+++ b/inferno/src/inferno/input.h
@@ -1,20 +1,35 @@
 #ifndef INPUT_H
 #define INPUT_H
 
-#include <utility>
+#include <utility> // std::pair
 
 namespace Inferno {
 
+	class MousePositionEvent;
+
 	class Input {
 	public:
+		static void update();
+
+		static bool onMousePosition(MousePositionEvent &e);
+
 		static bool isKeyPressed(int key);
 		static bool isMouseButtonPressed(int button);
 		static std::pair<float, float> getMousePosition();
 		static float getMouseX();
 		static float getMouseY();
+
+		static inline float getXOffset() { return m_xOffset; }
+		static inline float getYOffset() { return m_yOffset; }
+
+	private:
+		static bool m_firstMousePos;
+		static float m_xPosLast;
+		static float m_yPosLast;
+		static float m_xOffset;
+		static float m_yOffset;
 	};
 
 }
 
-
 #endif // INPUT_H