From 37c6a0aa3f2c3c21d29fcdedfea38e9ea5d5f369 Mon Sep 17 00:00:00 2001
From: Emmanuel AYME <eayme44@gmail.com>
Date: Tue, 24 Mar 2026 23:19:49 +0100
Subject: [PATCH] Add DirectX manipulating lib

---
 includes/DirectX.h | 12 ++++++++++++
 libs/DirectX.cpp   | 18 ++++++++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100644 includes/DirectX.h
 create mode 100644 libs/DirectX.cpp

diff --git a/includes/DirectX.h b/includes/DirectX.h
new file mode 100644
index 0000000..56edeb9
--- /dev/null
+++ b/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);
diff --git a/libs/DirectX.cpp b/libs/DirectX.cpp
new file mode 100644
index 0000000..78eaec6
--- /dev/null
+++ b/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;
+}
\ No newline at end of file