Add Hotkeys and OSD manager libs

libs/HotkeysManager.cpp

@@ -0,0 +1,32 @@
+#include "HotkeysManager.h"
+#include <vector>
+
+struct Hotkey {
+    int vk;
+    Modifier mods;
+    std::function<void()> callback;
+    bool wasPressed = false;
+};
+
+static std::vector<Hotkey> g_hotkeys;
+
+static bool IsModifierDown(reshade::api::effect_runtime* rt, Modifier m) {
+    if ((int)m & (int)Modifier::Alt && !rt->is_key_down(VK_MENU))    return false;
+    if ((int)m & (int)Modifier::Ctrl && !rt->is_key_down(VK_CONTROL)) return false;
+    if ((int)m & (int)Modifier::Shift && !rt->is_key_down(VK_SHIFT))   return false;
+    return true;
+}
+
+void RegisterHotkey(int vk, Modifier mods, std::function<void()> callback) {
+    g_hotkeys.push_back({ vk, mods, std::move(callback) });
+}
+
+void ProcessHotkeys(reshade::api::effect_runtime* runtime) {
+    for (auto& hotkey : g_hotkeys) {
+        bool pressed = IsModifierDown(runtime, hotkey.mods) && runtime->is_key_down(hotkey.vk);
+
+        if (pressed && !hotkey.wasPressed) hotkey.callback();
+
+        hotkey.wasPressed = pressed;
+    }
+}