Huge stuff. camera, input manager (mouse + keyboard), can move around scene now

src/InputManager.h

@@ -0,0 +1,61 @@
+//
+// Created by slinky on 5/3/26.
+//
+
+#ifndef B_ENGINE_INPUTMANAGER_H
+#define B_ENGINE_INPUTMANAGER_H
+
+#include <functional>
+#include <string>
+#include <initializer_list>
+#include <memory>
+
+#include "GLFW/glfw3.h"
+
+using MouseDeltaCallback = std::function<void(float, float)>;
+
+enum KeyState {
+    KEY_PRESSED,
+    KEY_HELD,
+    KEY_DOWN,
+    KEY_RELEASED,
+};
+
+struct InputRequirement {
+    int key;
+    KeyState state;
+};
+
+struct InputAction {
+    std::vector<InputRequirement> requirements{};
+};
+
+class InputManager {
+public:
+    static bool mouseInit;
+    static float lastMousePositionX;
+    static float lastMousePositionY;
+
+    static bool* currentKeyStates;
+    static bool* previousKeyStates;
+
+    static std::unordered_map<std::string, std::unique_ptr<InputAction>> registeredActions;
+
+    static void mouse_pos_callback(GLFWwindow* window, double x, double y);
+    static void add_mouse_listener(MouseDeltaCallback callback);
+
+    static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods);
+    static void generate_input_action(std::string_view actionName, std::initializer_list<InputRequirement> requirements);
+    static bool check_action_performed(std::string_view actionName);
+
+    static bool key_pressed(int key);
+    static bool key_held(int key);
+    static bool key_released(int key);
+    static bool key_down(int key);
+    static bool key_up(int key);
+private:
+    static std::vector<MouseDeltaCallback> mouse_listeners;
+    static void set_key_state(int key, bool state);
+};
+
+#endif //B_ENGINE_INPUTMANAGER_H