diff --git a/DDrawCompat/D3dDdi/Resource.cpp b/DDrawCompat/D3dDdi/Resource.cpp
index ed84a9d..873cc45 100644
--- a/DDrawCompat/D3dDdi/Resource.cpp
+++ b/DDrawCompat/D3dDdi/Resource.cpp
@@ -1317,18 +1317,46 @@ namespace D3dDdi
 				continue;
 			}
 
+			D3DDDIFORMAT format = D3DDDIFMT_X8R8G8B8;
+			COLORREF colorKey = 0;
+			BYTE alpha = 0;
+			DWORD flags = 0;
+			if (layeredWindow.dc)
+			{
+				colorKey = layeredWindow.colorKey;
+				alpha = layeredWindow.alpha;
+				if (CLR_INVALID != colorKey)
+				{
+					flags |= ULW_COLORKEY;
+				}
+				if (255 != alpha)
+				{
+					flags |= ULW_ALPHA;
+				}
+
+				if (layeredWindow.alphaFormat & AC_SRC_ALPHA)
+				{
+					format = D3DDDIFMT_A8R8G8B8;
+				}
+			}
+			else
+			{
+				GetLayeredWindowAttributes(layeredWindow.hwnd, &colorKey, &alpha, &flags);
+			}
+
 			RECT srcRect = { 0, 0, visibleRect.right - visibleRect.left + 1, visibleRect.bottom - visibleRect.top + 1 };
 			auto& windowSurface = repo.getTempSysMemSurface(srcRect.right, srcRect.bottom);
-			auto& texture = repo.getTempTexture(srcRect.right, srcRect.bottom, D3DDDIFMT_A8R8G8B8);
+			auto& texture = repo.getTempTexture(srcRect.right, srcRect.bottom, format);
 			if (!windowSurface.resource || !texture.resource)
 			{
 				continue;
 			}
 
-			HDC srcDc = GetWindowDC(layeredWindow.hwnd);
+			HDC srcDc = layeredWindow.dc ? layeredWindow.dc : GetWindowDC(layeredWindow.hwnd);
 			HDC dstDc = nullptr;
 			POINT srcOrig = { visibleRect.left - layeredWindow.rect.left, visibleRect.top - layeredWindow.rect.top };
 			windowSurface.surface->GetDC(windowSurface.surface, &dstDc);
+
 			CALL_ORIG_FUNC(BitBlt)(dstDc, 0, 0, srcRect.right - 1, srcRect.bottom - 1,
 				srcDc, srcOrig.x, srcOrig.y, SRCCOPY);
 			CALL_ORIG_FUNC(BitBlt)(dstDc, srcRect.right - 1, 0, 1, srcRect.bottom - 1,
@@ -1337,16 +1365,16 @@ namespace D3dDdi
 				srcDc, srcOrig.x, srcOrig.y + srcRect.bottom - 2, SRCCOPY);
 			CALL_ORIG_FUNC(BitBlt)(dstDc, srcRect.right - 1, srcRect.bottom - 1, 1, 1,
 				srcDc, srcOrig.x + srcRect.right - 2, srcOrig.y + srcRect.bottom - 2, SRCCOPY);
+
 			windowSurface.surface->ReleaseDC(windowSurface.surface, dstDc);
-			ReleaseDC(layeredWindow.hwnd, srcDc);
+			if (!layeredWindow.dc)
+			{
+				ReleaseDC(layeredWindow.hwnd, srcDc);
+			}
 
 			copySubResourceRegion(*texture.resource, 0, srcRect, *windowSurface.resource, 0, srcRect);
 			windowSurface.resource->notifyLock(0);
 
-			COLORREF colorKey = 0;
-			BYTE alpha = 0;
-			DWORD flags = 0;
-			GetLayeredWindowAttributes(layeredWindow.hwnd, &colorKey, &alpha, &flags);
 			const ShaderBlitter::ColorKeyInfo ck = { colorKey,
 				(flags & ULW_COLORKEY) ? D3DDDIFMT_A8R8G8B8 : D3DDDIFMT_UNKNOWN };
 
@@ -1359,9 +1387,17 @@ namespace D3dDdi
 
 			srcRect.right--;
 			srcRect.bottom--;
-			blitter.textureBlt(dst, dstSubResourceIndex, visibleRect, *texture.resource, 0, srcRect,
-				D3DTEXF_LINEAR | D3DTEXF_SRGB, ck, (flags & ULW_ALPHA) ? &alpha : nullptr,
-				layeredWindow.region);
+			if (layeredWindow.dc)
+			{
+				blitter.alphaBlendBlt(dst, dstSubResourceIndex, visibleRect, *texture.resource, 0, srcRect,
+					ck, (flags & ULW_ALPHA) ? alpha : 255, layeredWindow.region);
+			}
+			else
+			{
+				blitter.textureBlt(dst, dstSubResourceIndex, visibleRect, *texture.resource, 0, srcRect,
+					D3DTEXF_LINEAR | D3DTEXF_SRGB, ck, (flags & ULW_ALPHA) ? &alpha : nullptr,
+					layeredWindow.region);
+			}
 		}
 	}
 
diff --git a/DDrawCompat/D3dDdi/ShaderBlitter.cpp b/DDrawCompat/D3dDdi/ShaderBlitter.cpp
index 2101b77..c3a7e8e 100644
--- a/DDrawCompat/D3dDdi/ShaderBlitter.cpp
+++ b/DDrawCompat/D3dDdi/ShaderBlitter.cpp
@@ -3,10 +3,12 @@
 #include <Config/Settings/DisplayFilter.h>
 #include <D3dDdi/Adapter.h>
 #include <D3dDdi/Device.h>
+#include <D3dDdi/Log/CommonLog.h>
 #include <D3dDdi/Resource.h>
 #include <D3dDdi/ShaderBlitter.h>
 #include <D3dDdi/SurfaceRepository.h>
 #include <DDraw/Surfaces/PrimarySurface.h>
+#include <Shaders/AlphaBlend.h>
 #include <Shaders/Bilinear.h>
 #include <Shaders/ColorKey.h>
 #include <Shaders/ColorKeyBlend.h>
@@ -29,7 +31,8 @@
 namespace
 {
 	const UINT BLT_SRCALPHA = 1;
-	const UINT BLT_COLORKEYTEST = 2;
+	const UINT BLT_PREMULTIPLIED = 2;
+	const UINT BLT_COLORKEYTEST = 4;
 
 	const UINT CF_HORIZONTAL = 1;
 	const UINT CF_GAMMARAMP = 2;
@@ -41,6 +44,11 @@ namespace
 
 	std::array<D3dDdi::DeviceState::ShaderConstF, 2> convertToShaderConst(D3dDdi::ShaderBlitter::ColorKeyInfo colorKeyInfo)
 	{
+		if (D3DDDIFMT_UNKNOWN == colorKeyInfo.format)
+		{
+			return {};
+		}
+
 		const auto& fi = D3dDdi::getFormatInfo(colorKeyInfo.format);
 		return { {
 			{
@@ -78,8 +86,16 @@ namespace
 
 namespace D3dDdi
 {
+	std::ostream& operator<<(std::ostream& os, ShaderBlitter::ColorKeyInfo ck)
+	{
+		return Compat::LogStruct(os)
+			<< Compat::hex(ck.colorKey)
+			<< ck.format;
+	}
+
 	ShaderBlitter::ShaderBlitter(Device& device)
 		: m_device(device)
+		, m_psAlphaBlend(createPixelShader(g_psAlphaBlend))
 		, m_psBilinear(createPixelShader(g_psBilinear))
 		, m_psColorKey(createPixelShader(g_psColorKey))
 		, m_psColorKeyBlend(createPixelShader(g_psColorKeyBlend))
@@ -106,6 +122,22 @@ namespace D3dDdi
 		}
 	}
 
+	void ShaderBlitter::alphaBlendBlt(const Resource& dstResource, UINT dstSubResourceIndex, const RECT& dstRect,
+		const Resource& srcResource, UINT srcSubResourceIndex, const RECT& srcRect,
+		ColorKeyInfo srcColorKey, BYTE alpha, const Gdi::Region& srcRgn)
+	{
+		LOG_FUNC("ShaderBlitter::alphaBlendBlt", static_cast<HANDLE>(dstResource), dstSubResourceIndex, dstRect,
+			static_cast<HANDLE>(srcResource), srcSubResourceIndex, srcRect,
+			srcColorKey, static_cast<UINT>(alpha), static_cast<HRGN>(srcRgn));
+
+		auto ck = convertToShaderConst(srcColorKey);
+		ck[0][3] = alpha / 255.0f;
+		DeviceState::TempPixelShaderConst psConst(m_device.getState(), { 30, 2 }, ck.data());
+		blt(dstResource, dstSubResourceIndex, dstRect,
+			srcResource, srcSubResourceIndex, srcRect,
+			m_psAlphaBlend.get(), D3DTEXF_LINEAR, BLT_SRCALPHA | BLT_PREMULTIPLIED, nullptr, srcRgn);
+	}
+
 	void ShaderBlitter::bicubicBlt(const Resource& dstResource, UINT dstSubResourceIndex, const RECT& dstRect,
 		const Resource& srcResource, UINT srcSubResourceIndex, const RECT& srcRect, UINT blurPercent)
 	{
@@ -156,7 +188,7 @@ namespace D3dDdi
 		HANDLE pixelShader, UINT filter, UINT flags, const BYTE* alpha, const Gdi::Region& srcRgn)
 	{
 		LOG_FUNC("ShaderBlitter::blt", static_cast<HANDLE>(dstResource), dstSubResourceIndex, dstRect,
-			static_cast<HANDLE>(srcResource), srcSubResourceIndex, srcRect, pixelShader, filter,
+			static_cast<HANDLE>(srcResource), srcSubResourceIndex, srcRect, pixelShader, Compat::hex(filter),
 			Compat::hex(flags), alpha, static_cast<HRGN>(srcRgn));
 
 		if (!m_vertexShaderDecl || !pixelShader)
@@ -214,9 +246,10 @@ namespace D3dDdi
 		}
 		else if (flags & BLT_SRCALPHA)
 		{
+			const UINT D3DBLEND_ONE = 2;
 			const UINT D3DBLEND_SRCALPHA = 5;
 			const UINT D3DBLEND_INVSRCALPHA = 6;
-			state.setTempRenderState({ D3DDDIRS_SRCBLEND, D3DBLEND_SRCALPHA });
+			state.setTempRenderState({ D3DDDIRS_SRCBLEND, (flags & BLT_PREMULTIPLIED) ? D3DBLEND_ONE : D3DBLEND_SRCALPHA });
 			state.setTempRenderState({ D3DDDIRS_DESTBLEND, D3DBLEND_INVSRCALPHA });
 		}
 
diff --git a/DDrawCompat/D3dDdi/ShaderBlitter.h b/DDrawCompat/D3dDdi/ShaderBlitter.h
index 023b20f..30b6955 100644
--- a/DDrawCompat/D3dDdi/ShaderBlitter.h
+++ b/DDrawCompat/D3dDdi/ShaderBlitter.h
@@ -31,6 +31,9 @@ namespace D3dDdi
 		ShaderBlitter& operator=(const ShaderBlitter&) = delete;
 		ShaderBlitter& operator=(ShaderBlitter&&) = delete;
 
+		void alphaBlendBlt(const Resource& dstResource, UINT dstSubResourceIndex, const RECT& dstRect,
+			const Resource& srcResource, UINT srcSubResourceIndex, const RECT& srcRect,
+			ColorKeyInfo srcColorKey, BYTE alpha, const Gdi::Region& srcRgn);
 		void bilinearBlt(const Resource& dstResource, UINT dstSubResourceIndex, const RECT& dstRect,
 			const Resource& srcResource, UINT srcSubResourceIndex, const RECT& srcRect, UINT blurPercent);
 		void bicubicBlt(const Resource& dstResource, UINT dstSubResourceIndex, const RECT& dstRect,
@@ -117,6 +120,7 @@ namespace D3dDdi
 		void setTextureCoords(UINT stage, const RECT& rect, UINT width, UINT height);
 
 		Device& m_device;
+		std::unique_ptr<void, ResourceDeleter> m_psAlphaBlend;
 		std::unique_ptr<void, ResourceDeleter> m_psBilinear;
 		std::unique_ptr<void, ResourceDeleter> m_psColorKey;
 		std::unique_ptr<void, ResourceDeleter> m_psColorKeyBlend;
@@ -134,4 +138,6 @@ namespace D3dDdi
 		ConvolutionParams m_convolutionParams;
 		std::array<Vertex, 4> m_vertices;
 	};
+
+	std::ostream& operator<<(std::ostream& os, ShaderBlitter::ColorKeyInfo ck);
 }
diff --git a/DDrawCompat/DDrawCompat.vcxproj b/DDrawCompat/DDrawCompat.vcxproj
index ae98ffc..ac1e00b 100644
--- a/DDrawCompat/DDrawCompat.vcxproj
+++ b/DDrawCompat/DDrawCompat.vcxproj
@@ -478,6 +478,7 @@
     <None Include="Shaders\CubicConvolution.hlsli" />
   </ItemGroup>
   <ItemGroup>
+    <FxCompile Include="Shaders\AlphaBlend.hlsl" />
     <FxCompile Include="Shaders\Bilinear.hlsl" />
     <FxCompile Include="Shaders\ColorKey.hlsl" />
     <FxCompile Include="Shaders\ColorKeyBlend.hlsl" />
diff --git a/DDrawCompat/DDrawCompat.vcxproj.filters b/DDrawCompat/DDrawCompat.vcxproj.filters
index d811100..6da85da 100644
--- a/DDrawCompat/DDrawCompat.vcxproj.filters
+++ b/DDrawCompat/DDrawCompat.vcxproj.filters
@@ -1169,6 +1169,9 @@
     <FxCompile Include="Shaders\PointNoFilter.hlsl">
       <Filter>Shaders</Filter>
     </FxCompile>
+    <FxCompile Include="Shaders\AlphaBlend.hlsl">
+      <Filter>Shaders</Filter>
+    </FxCompile>
   </ItemGroup>
   <ItemGroup>
     <Image Include="arrow.bmp">
diff --git a/DDrawCompat/Gdi/PresentationWindow.cpp b/DDrawCompat/Gdi/PresentationWindow.cpp
index 3b6a211..392d250 100644
--- a/DDrawCompat/Gdi/PresentationWindow.cpp
+++ b/DDrawCompat/Gdi/PresentationWindow.cpp
@@ -40,6 +40,10 @@ namespace Gdi
 					if (presentationWindow)
 					{
 						CALL_ORIG_FUNC(SetLayeredWindowAttributes)(presentationWindow, 0, 255, LWA_ALPHA);
+						if (owner)
+						{
+							AttachThreadInput(GetCurrentThreadId(), GetWindowThreadProcessId(owner, nullptr), FALSE);
+						}
 					}
 				});
 			return LOG_RESULT(presentationWindow);
diff --git a/DDrawCompat/Gdi/WinProc.cpp b/DDrawCompat/Gdi/WinProc.cpp
index 8624de6..e086305 100644
--- a/DDrawCompat/Gdi/WinProc.cpp
+++ b/DDrawCompat/Gdi/WinProc.cpp
@@ -755,6 +755,36 @@ namespace
 		}
 	}
 
+	BOOL WINAPI updateLayeredWindow(HWND hWnd, HDC hdcDst, POINT* pptDst, SIZE* psize,
+		HDC hdcSrc, POINT* pptSrc, COLORREF crKey, BLENDFUNCTION* pblend, DWORD dwFlags)
+	{
+		LOG_FUNC("UpdateLayeredWindow", hWnd, hdcDst, pptDst, psize, hdcSrc, pptSrc, crKey, pblend, dwFlags);
+		BOOL result = CALL_ORIG_FUNC(UpdateLayeredWindow)(
+			hWnd, hdcDst, pptDst, psize, hdcSrc, pptSrc, crKey, pblend, dwFlags);
+		if (result)
+		{
+			Gdi::Window::updateLayeredWindowInfo(hWnd, hdcSrc, pptSrc,
+				(dwFlags & ULW_COLORKEY) ? crKey : CLR_INVALID,
+				((dwFlags & ULW_ALPHA) && pblend) ? pblend->SourceConstantAlpha : 255,
+				pblend ? pblend->AlphaFormat : 0);
+		}
+		return LOG_RESULT(result);
+	}
+
+	BOOL WINAPI updateLayeredWindowIndirect(HWND hwnd, const UPDATELAYEREDWINDOWINFO* pULWInfo)
+	{
+		LOG_FUNC("UpdateLayeredWindowIndirect", hwnd, pULWInfo);
+		BOOL result = CALL_ORIG_FUNC(UpdateLayeredWindowIndirect)(hwnd, pULWInfo);
+		if (result && pULWInfo)
+		{
+			Gdi::Window::updateLayeredWindowInfo(hwnd, pULWInfo->hdcSrc, pULWInfo->pptSrc,
+				(pULWInfo->dwFlags & ULW_COLORKEY) ? pULWInfo->crKey : CLR_INVALID,
+				((pULWInfo->dwFlags & ULW_ALPHA) && pULWInfo->pblend) ? pULWInfo->pblend->SourceConstantAlpha : 255,
+				pULWInfo->pblend ? pULWInfo->pblend->AlphaFormat : 0);
+		}
+		return LOG_RESULT(result);
+	}
+
 	void CALLBACK winEventProc(
 		HWINEVENTHOOK /*hWinEventHook*/,
 		DWORD event,
@@ -880,6 +910,8 @@ namespace Gdi
 			HOOK_FUNCTION(user32, SetWindowLongA, setWindowLongA);
 			HOOK_FUNCTION(user32, SetWindowLongW, setWindowLongW);
 			HOOK_FUNCTION(user32, SetWindowPos, setWindowPos);
+			HOOK_FUNCTION(user32, UpdateLayeredWindow, updateLayeredWindow);
+			HOOK_FUNCTION(user32, UpdateLayeredWindowIndirect, updateLayeredWindowIndirect);
 
 			g_dwmSetIconicThumbnail = reinterpret_cast<decltype(&DwmSetIconicThumbnail)>(
 				GetProcAddress(GetModuleHandle("dwmapi"), "DwmSetIconicThumbnail"));
diff --git a/DDrawCompat/Gdi/Window.cpp b/DDrawCompat/Gdi/Window.cpp
index f6be18c..9399f64 100644
--- a/DDrawCompat/Gdi/Window.cpp
+++ b/DDrawCompat/Gdi/Window.cpp
@@ -5,6 +5,7 @@
 #include <dwmapi.h>
 
 #include <Common/Log.h>
+#include <Common/Rect.h>
 #include <D3dDdi/KernelModeThunks.h>
 #include <D3dDdi/ScopedCriticalSection.h>
 #include <DDraw/RealPrimarySurface.h>
@@ -23,6 +24,74 @@
 
 namespace
 {
+	class LayeredWindowContent
+	{
+	public:
+		~LayeredWindowContent()
+		{
+			destroy();
+		}
+
+		BYTE getAlpha() const { return m_alpha; }
+		BYTE getAlphaFormat() const { return m_alphaFormat; }
+		COLORREF getColorKey() const { return m_colorKey; }
+		HDC getDc() const { return m_dc; }
+
+		void set(HWND hwnd, HDC hdcSrc, const POINT* pptSrc, COLORREF colorKey, BYTE alpha, BYTE alphaFormat)
+		{
+			if (hdcSrc)
+			{
+				RECT wr = {};
+				GetWindowRect(hwnd, &wr);
+				const SIZE size = Rect::getSize(wr);
+
+				if (size != m_size)
+				{
+					destroy();
+					m_size = size;
+					m_dc = CreateCompatibleDC(nullptr);
+					m_origBmp = SelectObject(m_dc, CALL_ORIG_FUNC(CreateBitmap)(size.cx, size.cy, 1, 32, nullptr));
+				}
+
+				CALL_ORIG_FUNC(BitBlt)(m_dc, 0, 0, size.cx, size.cy,
+					hdcSrc, pptSrc ? pptSrc->x : 0, pptSrc ? pptSrc->y : 0, SRCCOPY);
+
+				if (alphaFormat & AC_SRC_ALPHA)
+				{
+					BITMAP bm = {};
+					GetObject(GetCurrentObject(hdcSrc, OBJ_BITMAP), sizeof(bm), &bm);
+					if (32 != bm.bmBitsPixel)
+					{
+						alphaFormat &= ~AC_SRC_ALPHA;
+					}
+				}
+			}
+
+			m_colorKey = colorKey;
+			m_alpha = alpha;
+			m_alphaFormat = alphaFormat;
+		}
+
+	private:
+		void destroy()
+		{
+			if (m_dc)
+			{
+				DeleteObject(SelectObject(m_dc, m_origBmp));
+				DeleteDC(m_dc);
+				m_dc = nullptr;
+				m_origBmp = nullptr;
+			}
+		}
+
+		HDC m_dc = nullptr;
+		HGDIOBJ m_origBmp = nullptr;
+		SIZE m_size = {};
+		COLORREF m_colorKey = CLR_INVALID;
+		BYTE m_alpha = 255;
+		BYTE m_alphaFormat = 0;
+	};
+
 	struct UpdateWindowContext
 	{
 		Gdi::Region obscuredRegion;
@@ -39,6 +108,7 @@ namespace
 		RECT clientRect;
 		Gdi::Region visibleRegion;
 		Gdi::Region invalidatedRegion;
+		LayeredWindowContent layeredWindowContent;
 		bool isMenu;
 		bool isLayered;
 		bool isDpiAware;
@@ -90,57 +160,6 @@ namespace
 		return true;
 	}
 
-	void presentLayeredWindow(CompatWeakPtr<IDirectDrawSurface7> dst,
-		HWND hwnd, RECT wr, const RECT& monitorRect, HDC& dstDc, Gdi::Region* rgn = nullptr, bool isMenu = false)
-	{
-		if (!dst)
-		{
-			throw true;
-		}
-
-		if (!dstDc)
-		{
-			dst->GetDC(dst, &dstDc);
-			if (!dstDc)
-			{
-				throw false;
-			}
-		}
-
-		OffsetRect(&wr, -monitorRect.left, -monitorRect.top);
-		if (rgn)
-		{
-			rgn->offset(-monitorRect.left, -monitorRect.top);
-		}
-
-		HDC windowDc = GetWindowDC(hwnd);
-		if (rgn)
-		{
-			SelectClipRgn(dstDc, *rgn);
-		}
-
-		COLORREF colorKey = 0;
-		BYTE alpha = 255;
-		DWORD flags = ULW_ALPHA;
-		if (isMenu || CALL_ORIG_FUNC(GetLayeredWindowAttributes)(hwnd, &colorKey, &alpha, &flags))
-		{
-			if (flags & LWA_COLORKEY)
-			{
-				CALL_ORIG_FUNC(TransparentBlt)(dstDc, wr.left, wr.top, wr.right - wr.left, wr.bottom - wr.top,
-					windowDc, 0, 0, wr.right - wr.left, wr.bottom - wr.top, colorKey);
-			}
-			else
-			{
-				BLENDFUNCTION blend = {};
-				blend.SourceConstantAlpha = alpha;
-				CALL_ORIG_FUNC(AlphaBlend)(dstDc, wr.left, wr.top, wr.right - wr.left, wr.bottom - wr.top,
-					windowDc, 0, 0, wr.right - wr.left, wr.bottom - wr.top, blend);
-			}
-		}
-
-		CALL_ORIG_FUNC(ReleaseDC)(hwnd, windowDc);
-	}
-
 	void updatePosition(Window& window, const RECT& oldWindowRect, const RECT& oldClientRect,
 		const Gdi::Region& oldVisibleRegion, Gdi::Region& invalidatedRegion)
 	{
@@ -351,7 +370,14 @@ namespace Gdi
 				auto& window = **it;
 				if (window.isLayered && !window.visibleRegion.isEmpty())
 				{
-					layeredWindows.push_back({ window.hwnd, window.windowRect, window.visibleRegion });
+					layeredWindows.push_back({
+						window.hwnd,
+						window.windowRect,
+						window.visibleRegion,
+						window.layeredWindowContent.getDc(),
+						window.layeredWindowContent.getColorKey(),
+						window.layeredWindowContent.getAlpha(),
+						window.layeredWindowContent.getAlphaFormat() });
 				}
 			}
 			return layeredWindows;
@@ -640,6 +666,21 @@ namespace Gdi
 			}
 		}
 
+		void updateLayeredWindowInfo(HWND hwnd, HDC hdcSrc, const POINT* pptSrc,
+			COLORREF colorKey, BYTE alpha, BYTE alphaFormat)
+		{
+			D3dDdi::ScopedCriticalSection lock;
+			auto it = g_windows.find(hwnd);
+			if (it != g_windows.end())
+			{
+				it->second.layeredWindowContent.set(hwnd, hdcSrc, pptSrc, colorKey, alpha, alphaFormat);
+				if (DDraw::RealPrimarySurface::isFullscreen())
+				{
+					DDraw::RealPrimarySurface::scheduleOverlayUpdate();
+				}
+			}
+		}
+
 		void updatePresentationWindowPos(HWND presentationWindow, HWND owner)
 		{
 			if (IsIconic(owner))
diff --git a/DDrawCompat/Gdi/Window.h b/DDrawCompat/Gdi/Window.h
index 2cf8ddb..3149352 100644
--- a/DDrawCompat/Gdi/Window.h
+++ b/DDrawCompat/Gdi/Window.h
@@ -15,6 +15,10 @@ namespace Gdi
 			HWND hwnd;
 			RECT rect;
 			Gdi::Region region;
+			HDC dc;
+			COLORREF colorKey;
+			BYTE alpha;
+			BYTE alphaFormat;
 		};
 
 		HWND getPresentationWindow(HWND hwnd);
@@ -31,6 +35,8 @@ namespace Gdi
 		void present(Gdi::Region excludeRegion);
 		void setDpiAwareness(HWND hwnd, bool dpiAware);
 		void updateAll();
+		void updateLayeredWindowInfo(HWND hwnd, HDC hdcSrc, const POINT* pptSrc,
+			COLORREF colorKey, BYTE alpha, BYTE alphaFormat);
 		void updatePresentationWindowPos(HWND presentationWindow, HWND owner);
 	}
 }
diff --git a/DDrawCompat/Shaders/AlphaBlend.hlsl b/DDrawCompat/Shaders/AlphaBlend.hlsl
new file mode 100644
index 0000000..1ff8501
--- /dev/null
+++ b/DDrawCompat/Shaders/AlphaBlend.hlsl
@@ -0,0 +1,10 @@
+sampler2D s_texture : register(s0);
+float4 g_colorKey : register(c30);
+float4 g_threshold : register(c31);
+
+float4 main(float2 texCoord : TEXCOORD0) : COLOR0
+{
+    float4 color = tex2D(s_texture, texCoord);
+    const float4 diff = abs(color - g_colorKey);
+    return all(diff.rgb < g_threshold.rgb) ? 0 : (g_colorKey.a * color);
+}
diff --git a/DDrawCompat/Win32/Log.cpp b/DDrawCompat/Win32/Log.cpp
index b32742e..82622f7 100644
--- a/DDrawCompat/Win32/Log.cpp
+++ b/DDrawCompat/Win32/Log.cpp
@@ -134,6 +134,15 @@ std::ostream& operator<<(std::ostream& os, const BITMAPINFOHEADER& bmih)
 		<< bmih.biClrImportant;
 }
 
+std::ostream& operator<<(std::ostream& os, const BLENDFUNCTION& bf)
+{
+	return Compat::LogStruct(os)
+		<< static_cast<UINT>(bf.BlendOp)
+		<< static_cast<UINT>(bf.BlendFlags)
+		<< static_cast<UINT>(bf.SourceConstantAlpha)
+		<< static_cast<UINT>(bf.AlphaFormat);
+}
+
 std::ostream& operator<<(std::ostream& os, const COMPAREITEMSTRUCT& cis)
 {
 	return Compat::LogStruct(os)
diff --git a/DDrawCompat/Win32/Log.h b/DDrawCompat/Win32/Log.h
index 9a1cd00..bdd0c20 100644
--- a/DDrawCompat/Win32/Log.h
+++ b/DDrawCompat/Win32/Log.h
@@ -7,6 +7,7 @@
 std::ostream& operator<<(std::ostream& os, const BITMAP& bm);
 std::ostream& operator<<(std::ostream& os, const BITMAPINFO& bmi);
 std::ostream& operator<<(std::ostream& os, const BITMAPINFOHEADER& bmih);
+std::ostream& operator<<(std::ostream& os, const BLENDFUNCTION& bf);
 std::ostream& operator<<(std::ostream& os, const COMPAREITEMSTRUCT& cis);
 std::ostream& operator<<(std::ostream& os, const COPYDATASTRUCT& cds);
 std::ostream& operator<<(std::ostream& os, const CREATESTRUCTA& cs);