Add Hotkeys and OSD manager libs

libs/OSDManager.cpp

@@ -0,0 +1,33 @@
+#include "OSDManager.h"
+
+static float g_timer = 0.0f;
+static OSDUpdateFn g_onUpdate;
+static OSDEndFn g_onEnd;
+
+void ShowOSD(float duration, OSDUpdateFn onUpdate, OSDEndFn onEnd) {
+    g_timer = duration;
+    g_onUpdate = std::move(onUpdate);
+    g_onEnd = std::move(onEnd);
+}
+
+void UpdateOSD(reshade::api::effect_runtime* runtime, float deltaTime) {
+    if (g_timer <= 0.0f) return;
+
+    g_timer -= deltaTime;
+
+    if (g_onUpdate) g_onUpdate(runtime);
+
+    if (g_timer <= 0.0f) {
+        if (g_onEnd) g_onEnd(runtime);
+
+        g_onUpdate = nullptr;
+        g_onEnd = nullptr;
+    }
+}
+
+void ResetAllUniformVariables(reshade::api::effect_runtime* runtime, const char* effect_name) {
+    runtime->enumerate_uniform_variables(effect_name, [runtime](reshade::api::effect_runtime* rt, reshade::api::effect_uniform_variable OSDvar) {
+        runtime->reset_uniform_value(OSDvar);
+    });
+}
+