From 20e0e6dbd8ccd4477c8d1627728304a8f95ae959 Mon Sep 17 00:00:00 2001
From: Jake Maxwell <82926063+jota2rz@users.noreply.github.com>
Date: Tue, 12 May 2026 13:19:46 -0400
Subject: [PATCH] fix(upscaling): preserve D3D12 proxy swap chain for SKSE
 plugin compatibility

---
 src/Features/Upscaling.cpp | 7 ++++++-
 src/Hooks.cpp              | 6 ++++--
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/src/Features/Upscaling.cpp b/src/Features/Upscaling.cpp
index eb0d599103..b3a0190b6c 100644
--- a/src/Features/Upscaling.cpp
+++ b/src/Features/Upscaling.cpp
@@ -133,7 +133,12 @@ HRESULT WINAPI hk_D3D11CreateDeviceAndSwapChainUpscaling(
 
 			if (upscaling.IsBackendInitialized()) {
 				upscaling.UpgradeBackendInterface((void**)&(*ppDevice));
-				upscaling.UpgradeBackendInterface((void**)&(*ppSwapChain));
+				// Don't wrap the swap chain with Streamline when using the D3D12
+				// proxy.  The proxy's GetDevice() returns the D3D11 device for
+				// IID_ID3D11Device, which other SKSE plugins (e.g. SkyrimPlatform)
+				// rely on.  Streamline's wrapper would bypass this override and
+				// forward to the underlying D3D12 swap chain, causing
+				// E_NOINTERFACE.  The proxy must remain the outermost layer.
 				upscaling.SetBackendD3DDevice(*ppDevice);
 				// Some features (notably Reflex/PCL) may report availability only after device bind.
 				upscaling.CheckBackendFeatures(pAdapter);
diff --git a/src/Hooks.cpp b/src/Hooks.cpp
index d3dd4f8cc6..cd7dbb0538 100644
--- a/src/Hooks.cpp
+++ b/src/Hooks.cpp
@@ -313,8 +313,10 @@ struct IDXGISwapChain_Present
 		// OMGetRenderTargets to find a target to render overlays into. Without this, they
 		// get nullptr (we unbound everything for the ApplyHDR resource hazard) and their
 		// UI elements are invisible.
-		if (hdrReady && !frameGenActive) {
-			hdr->ClearUIBuffer();  // restores kFRAMEBUFFER.RTV to original backbuffer RTV
+		if (hdrReady) {
+			if (!frameGenActive) {
+				hdr->ClearUIBuffer();  // restores kFRAMEBUFFER.RTV to original backbuffer RTV
+			}
 			auto& data = globals::game::renderer->GetRuntimeData().renderTargets[RE::RENDER_TARGET::kFRAMEBUFFER];
 			globals::d3d::context->OMSetRenderTargets(1, &data.RTV, nullptr);
 		}