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diff --git a/src/video_core/vulkan_common/streamline.h b/src/video_core/vulkan_common/streamline.h
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+++ b/src/video_core/vulkan_common/streamline.h
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+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+// NVIDIA DLSS through NVIDIA Streamline. Only Streamline's MIT-licensed
+// headers are built in: NVIDIA's DLLs are loaded at run time from the user's PC, and none ship
+// with the emulator.
+
+#pragma once
+
+#include <filesystem>
+#include <string>
+#include <vector>
+
+#include "common/common_types.h"
+#include "video_core/vulkan_common/vulkan_wrapper.h"
+
+namespace Vulkan::Streamline {
+
+/// NVIDIA's files DLSS needs, as found on this PC. Paths are empty when missing.
+struct DlssFiles {
+    std::filesystem::path folder;     ///< Where the loader is, or where it should go
+    std::filesystem::path interposer; ///< sl.interposer.dll (Streamline's loader)
+    std::filesystem::path model;      ///< nvngx_dlss.dll next to the loader
+    std::filesystem::path app_model;  ///< Newest DLSS the NVIDIA app downloaded
+    std::string interposer_version;
+    std::string model_version;
+    std::string app_model_version;
+};
+
+[[nodiscard]] DlssFiles FindDlssFiles();
+
+/// The user folder's "streamline" folder.
+[[nodiscard]] std::filesystem::path UserFolder();
+
+/// Streamline's own modules carry a second, Streamline-only signature.
+[[nodiscard]] bool IsStreamlineModule(const std::filesystem::path& path);
+
+/// A valid Authenticode signature from NVIDIA Corporation (DLSS models).
+[[nodiscard]] bool IsSignedByNvidia(const std::filesystem::path& path);
+
+/// When the NVIDIA DLSS setting is on, loads the user's sl.interposer.dll (checking NVIDIA's
+/// signature) and starts Streamline for DLSS. Call before creating the renderer's instance.
+bool Start();
+
+/// Whether Streamline is running and waiting for the renderer's device.
+[[nodiscard]] bool WantsDevice();
+
+/// Instance and device extensions DLSS asks for (empty when Streamline isn't running).
+[[nodiscard]] std::vector<std::string> InstanceExtensions();
+[[nodiscard]] std::vector<std::string> DeviceExtensions();
+
+/// Hands the renderer's device to Streamline and routes the swapchain calls through it, as
+/// Streamline's manual hooking needs. Stops Streamline and returns false when DLSS can't run.
+bool AttachDevice(VkInstance instance, VkPhysicalDevice physical, VkDevice device,
+                  u32 graphics_family, vk::DeviceDispatch& dld);
+
+/// Whether DLSS can run on the attached device.
+[[nodiscard]] bool IsDlssAvailable();
+
+/// Shuts Streamline down; call before the device is destroyed.
+void Stop();
+
+} // namespace Vulkan::Streamline