Add hotkeys manager

includes/HotkeysManager.h

@@ -0,0 +1,44 @@
+#pragma once
+
+#include <Windows.h>
+#include <reshade.hpp>
+#include <functional>
+
+enum class Modifier {
+    None = 0,
+    Alt = 1 << 0,
+    Ctrl = 1 << 1,
+    Shift = 1 << 2
+};
+
+/**
+ * @brief Registers a new hotkey for the plugin.
+ *
+ * This function adds a hotkey that will be checked every frame via
+ * `ProcessHotkeys`. When the specified key (with optional modifiers)
+ * is pressed, the provided callback will be executed.
+ *
+ * @param vk The virtual key code (e.g., VK_F1, VK_F2, etc.).
+ * @param mods The modifier keys required to trigger the hotkey (ALT, CTRL, SHIFT).
+ * @param callback The function to execute when the hotkey is pressed.
+ *
+ * @note The callback should be fast and must not block the main thread.
+ * @note Hotkeys are only checked when `ProcessHotkeys` is called.
+ */
+void RegisterHotkey(int vk, Modifier mods, std::function<void()> callback);
+
+
+/**
+ * @brief Processes all registered hotkeys and executes their callbacks.
+ *
+ * This function should be called **once per frame**, typically in
+ * `on_reshade_present`, to detect key presses and trigger callbacks.
+ *
+ * @param runtime Pointer to the `reshade::api::effect_runtime` object,
+ *        required if a callback manipulates shaders or uniforms.
+ *
+ * @note If no hotkey is pressed, this function does nothing.
+ * @note All hotkeys must have been previously registered with `RegisterHotkey`.
+ */
+void ProcessHotkeys(reshade::api::effect_runtime* runtime);
+