Add DirectX manipulating lib

includes/DirectX.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include <reshade.hpp>
+
+/**
+ * @brief Retrieves Display mode.
+ *
+ * This function should be calld on event `on_present`
+ *
+ * @param swapchain retrieved from on_present event
+ */
+bool IsExclusiveFullscreen(reshade::api::swapchain* swapchain);

libs/DirectX.cpp

@@ -0,0 +1,18 @@
+#include "DirectX.h"
+#include <dxgi.h>
+
+bool IsExclusiveFullscreen(reshade::api::swapchain* swapchain) {
+    if (!swapchain) return false;
+
+    auto native = swapchain->get_native(); // Retrieving native swapchain
+    IDXGISwapChain* dxgiSwap = reinterpret_cast<IDXGISwapChain*>(native);
+    if (!dxgiSwap) return false;
+
+    DXGI_SWAP_CHAIN_DESC desc = {};
+    bool exclusive = false;
+
+    if (SUCCEEDED(dxgiSwap->GetDesc(&desc)))
+        exclusive = (desc.Windowed == FALSE); // FALSE = exclusive fullscreen
+
+    return exclusive;
+}