Add OSD shader manager

includes/OSDManager.h

@@ -0,0 +1,49 @@
+#pragma once
+
+#include <reshade.hpp>
+#include <functional>
+
+using OSDUpdateFn = std::function<void(reshade::api::effect_runtime*)>;
+using OSDEndFn = std::function<void(reshade::api::effect_runtime*)>;
+
+/**
+ * @brief Displays an On-Screen Display (OSD) for a specified duration.
+ *
+ * This function triggers an OSD that lasts for `duration` seconds.
+ * During the OSD display, the `onUpdate` callback will be called every frame
+ * with the current `reshade::api::effect_runtime` pointer, allowing shader updates
+ * or other visual effects. When the OSD duration ends, the `onEnd` callback
+ * is executed to perform any cleanup or final state updates.
+ * @param duration Duration in seconds for which the OSD should be visible.
+ * @param onUpdate Callback executed each frame while the OSD is visible.
+ * @param onEnd Callback executed once when the OSD ends or expires.
+ * @note This function only schedules the OSD. The actual frame updates occur
+ *       during `UpdateOSD`, which must be called once per frame.
+ * @note Callbacks should be fast and non-blocking.
+ */
+void ShowOSD(float duration, OSDUpdateFn onUpdate, OSDEndFn onEnd);
+
+
+/**
+ * @brief Updates the OSD system each frame and executes callbacks if needed.
+ *
+ * This function must be called once per frame, typically in `on_reshade_present`,
+ * to update any active OSDs, decrement their timers, and call the
+ * `onUpdate` and `onEnd` callbacks as necessary.
+ * @param runtime Pointer to the current `reshade::api::effect_runtime` object.
+ * @param deltaTime Time elapsed (in seconds) since the last frame.
+ * @note If no OSD is active, this function does nothing.
+ * @note Always call this function after processing hotkeys to ensure proper
+ *       timing of OSDs.
+ */
+void UpdateOSD(reshade::api::effect_runtime* runtime, float deltaTime);
+
+/**
+ * @brief Reset all uniform variables enumerated.
+ *
+ * This function must be called once, typically in `on_reshade_begin_effects`,
+ * using an atomic compare-and-exchange operation
+ * @param runtime Pointer to the current `reshade::api::effect_runtime` object.
+ * @param effect_name File name of the effect file to enumerate uniform variables from (eg. myfile.fx)
+ */
+void ResetAllUniformVariables(reshade::api::effect_runtime* runtime, const char* effect_name);