diff --git a/src/rendering/polyrenderer/backend/poly_framebuffer.cpp b/src/rendering/polyrenderer/backend/poly_framebuffer.cpp
index c5e2a6707..3d8b75bd8 100644
--- a/src/rendering/polyrenderer/backend/poly_framebuffer.cpp
+++ b/src/rendering/polyrenderer/backend/poly_framebuffer.cpp
@@ -48,13 +48,20 @@ extern bool keepGpuStatActive;
 extern FString gpuStatOutput;
 
 #ifdef WIN32
-void I_PresentPolyImage(int w, int h, const void *pixels);
+void I_PolyPresentInit();
+uint8_t *I_PolyPresentLock(int w, int h, int &pitch);
+void I_PolyPresentUnlock(int x, int y, int w, int h);
+void I_PolyPresentDeinit();
 #else
-void I_PresentPolyImage(int w, int h, const void *pixels) { }
+void I_PolyPresentInit() { }
+uint8_t *I_PolyPresentLock(int w, int h, int &pitch) { pitch = 0; return nullptr; }
+void I_PolyPresentUnlock() { }
+void I_PolyPresentDeinit() { }
 #endif
 
 PolyFrameBuffer::PolyFrameBuffer(void *hMonitor, bool fullscreen) : Super(hMonitor, fullscreen) 
 {
+	I_PolyPresentInit();
 }
 
 PolyFrameBuffer::~PolyFrameBuffer()
@@ -74,6 +81,8 @@ PolyFrameBuffer::~PolyFrameBuffer()
 	mShadowMap.Reset();
 
 	screen = tmp;
+
+	I_PolyPresentDeinit();
 }
 
 void PolyFrameBuffer::InitializeState()
@@ -145,7 +154,20 @@ void PolyFrameBuffer::Update()
 
 	if (mCanvas)
 	{
-		I_PresentPolyImage(mCanvas->GetWidth(), mCanvas->GetHeight(), mCanvas->GetPixels());
+		int w = mCanvas->GetWidth();
+		int h = mCanvas->GetHeight();
+		int pixelsize = 4;
+		const uint8_t *src = (const uint8_t*)mCanvas->GetPixels();
+		int pitch = 0;
+		uint8_t *dst = I_PolyPresentLock(w, h, pitch);
+		if (dst)
+		{
+			for (int y = 0; y < h; y++)
+			{
+				memcpy(dst + y * pitch, src + y * w * pixelsize, w * pixelsize);
+			}
+			I_PolyPresentUnlock(mOutputLetterbox.left, mOutputLetterbox.top, mOutputLetterbox.width, mOutputLetterbox.height);
+		}
 	}
 
 	CheckCanvas();
diff --git a/src/win32/win32polyvideo.cpp b/src/win32/win32polyvideo.cpp
index e783c710b..a6e74218a 100644
--- a/src/win32/win32polyvideo.cpp
+++ b/src/win32/win32polyvideo.cpp
@@ -4,26 +4,72 @@
 #include "doomerrors.h"
 #include <Windows.h>
 
-extern HWND Window;
+EXTERN_CVAR(Bool, vid_vsync)
 
-#if 1
+extern HWND Window;
 
 #include <d3d9.h>
 #pragma comment(lib, "d3d9.lib")
 
-struct D3D9Present
+namespace
 {
-	D3D9Present()
+	int SrcWidth = 0;
+	int SrcHeight = 0;
+	int ClientWidth = 0;
+	int ClientHeight = 0;
+	bool CurrentVSync = false;
+
+	IDirect3D9 *d3d9 = nullptr;
+	IDirect3DDevice9 *device = nullptr;
+	IDirect3DSurface9 *surface = nullptr;
+}
+
+void I_PolyPresentInit()
+{
+	d3d9 = Direct3DCreate9(D3D_SDK_VERSION);
+	if (!d3d9)
 	{
-		d3d9 = Direct3DCreate9(D3D_SDK_VERSION);
-		if (!d3d9)
+		I_FatalError("Direct3DCreate9 failed");
+	}
+
+	RECT rect = {};
+	GetClientRect(Window, &rect);
+
+	CurrentVSync = vid_vsync;
+	ClientWidth = rect.right;
+	ClientHeight = rect.bottom;
+
+	D3DPRESENT_PARAMETERS pp = {};
+	pp.Windowed = true;
+	pp.SwapEffect = D3DSWAPEFFECT_DISCARD;
+	pp.BackBufferWidth = ClientWidth;
+	pp.BackBufferHeight = ClientHeight;
+	pp.BackBufferCount = 1;
+	pp.hDeviceWindow = Window;
+	pp.PresentationInterval = CurrentVSync ? D3DPRESENT_INTERVAL_ONE : D3DPRESENT_INTERVAL_IMMEDIATE;
+
+	HRESULT result = d3d9->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, Window, D3DCREATE_HARDWARE_VERTEXPROCESSING, &pp, &device);
+	if (FAILED(result))
+	{
+		I_FatalError("IDirect3D9.CreateDevice failed");
+	}
+}
+
+uint8_t *I_PolyPresentLock(int w, int h, int &pitch)
+{
+	HRESULT result;
+
+	RECT rect = {};
+	GetClientRect(Window, &rect);
+	if (rect.right != ClientWidth || rect.bottom != ClientHeight || CurrentVSync != vid_vsync)
+	{
+		if (surface)
 		{
-			I_FatalError("Direct3DCreate9 failed");
+			surface->Release();
+			surface = nullptr;
 		}
 
-		bool vsync = false;
-		RECT rect = {};
-		GetClientRect(Window, &rect);
+		CurrentVSync = vid_vsync;
 		ClientWidth = rect.right;
 		ClientHeight = rect.bottom;
 
@@ -34,120 +80,108 @@ struct D3D9Present
 		pp.BackBufferHeight = ClientHeight;
 		pp.BackBufferCount = 1;
 		pp.hDeviceWindow = Window;
-		pp.PresentationInterval = vsync ? D3DPRESENT_INTERVAL_ONE : D3DPRESENT_INTERVAL_IMMEDIATE;
+		pp.PresentationInterval = CurrentVSync ? D3DPRESENT_INTERVAL_ONE : D3DPRESENT_INTERVAL_IMMEDIATE;
+		device->Reset(&pp);
+	}
 
-		HRESULT result = d3d9->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, Window, D3DCREATE_HARDWARE_VERTEXPROCESSING, &pp, &device);
+	if (SrcWidth != w || SrcHeight != h || !surface)
+	{
+		if (surface)
+		{
+			surface->Release();
+			surface = nullptr;
+		}
+
+		SrcWidth = w;
+		SrcHeight = h;
+		result = device->CreateOffscreenPlainSurface(SrcWidth, SrcHeight, D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT, &surface, 0);
 		if (FAILED(result))
 		{
-			I_FatalError("IDirect3D9.CreateDevice failed");
+			I_FatalError("IDirect3DDevice9.CreateOffscreenPlainSurface failed");
 		}
 	}
 
-	void Present(int w, int h, const void *pixels)
+	D3DLOCKED_RECT lockrect = {};
+	result = surface->LockRect(&lockrect, nullptr, D3DLOCK_DISCARD);
+	if (FAILED(result))
 	{
-		HRESULT result;
-		if (SrcWidth != w || SrcHeight != h || !surface)
+		pitch = 0;
+		return nullptr;
+	}
+
+	pitch = lockrect.Pitch;
+	return (uint8_t*)lockrect.pBits;
+}
+
+void I_PolyPresentUnlock(int x, int y, int width, int height)
+{
+	surface->UnlockRect();
+
+	IDirect3DSurface9 *backbuffer = nullptr;
+	HRESULT result = device->GetBackBuffer(0, 0, D3DBACKBUFFER_TYPE_MONO, &backbuffer);
+	if (FAILED(result))
+		return;
+
+	result = device->BeginScene();
+	if (SUCCEEDED(result))
+	{
+		int count = 0;
+		D3DRECT clearrects[4];
+		if (y > 0)
 		{
-			if (surface)
-			{
-				surface->Release();
-				surface = nullptr;
-			}
-
-			SrcWidth = w;
-			SrcHeight = h;
-			result = device->CreateOffscreenPlainSurface(SrcWidth, SrcHeight, D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT, &surface, 0);
-			if (FAILED(result))
-			{
-				I_FatalError("IDirect3DDevice9.CreateOffscreenPlainSurface failed");
-			}
+			clearrects[count].x1 = 0;
+			clearrects[count].y1 = 0;
+			clearrects[count].x2 = ClientWidth;
+			clearrects[count].y2 = y;
+			count++;
 		}
-
-		D3DLOCKED_RECT lockrect = {};
-		result = surface->LockRect(&lockrect, nullptr, D3DLOCK_DISCARD);
-		if (FAILED(result))
-			return;
-
-		int pixelsize = 4;
-		const uint8_t *src = (const uint8_t*)pixels;
-		uint8_t *dst = (uint8_t*)lockrect.pBits;
-		for (int y = 0; y < h; y++)
+		if (y + height < ClientHeight)
 		{
-			memcpy(dst + y * lockrect.Pitch, src + y * w * pixelsize, w * pixelsize);
+			clearrects[count].x1 = 0;
+			clearrects[count].y1 = y + height;
+			clearrects[count].x2 = ClientWidth;
+			clearrects[count].y2 = ClientHeight;
+			count++;
 		}
+		if (x > 0)
+		{
+			clearrects[count].x1 = 0;
+			clearrects[count].y1 = y;
+			clearrects[count].x2 = x;
+			clearrects[count].y2 = y + height;
+			count++;
+		}
+		if (x + width < ClientWidth)
+		{
+			clearrects[count].x1 = x + width;
+			clearrects[count].y1 = y;
+			clearrects[count].x2 = ClientWidth;
+			clearrects[count].y2 = y + height;
+			count++;
+		}
+		if (count > 0)
+			device->Clear(count, clearrects, D3DCLEAR_TARGET, 0, 0.0f, 0);
 
-		surface->UnlockRect();
+		RECT srcrect = {}, dstrect = {};
+		srcrect.right = SrcWidth;
+		srcrect.bottom = SrcHeight;
+		dstrect.left = x;
+		dstrect.top = y;
+		dstrect.right = x + width;
+		dstrect.bottom = y + height;
+		device->StretchRect(surface, &srcrect, backbuffer, &dstrect, D3DTEXF_LINEAR);
 
-		IDirect3DSurface9 *backbuffer = nullptr;
-		device->GetBackBuffer(0, 0, D3DBACKBUFFER_TYPE_MONO, &backbuffer);
-		if (FAILED(result))
-			return;
-
-		result = device->BeginScene();
+		result = device->EndScene();
 		if (SUCCEEDED(result))
-		{
-			RECT srcrect = {}, dstrect = {};
-			srcrect.right = SrcWidth;
-			srcrect.bottom = SrcHeight;
-			dstrect.right = ClientWidth;
-			dstrect.bottom = ClientHeight;
-			device->StretchRect(surface, &srcrect, backbuffer, &dstrect, D3DTEXF_LINEAR);
-
-			result = device->EndScene();
-			if (SUCCEEDED(result))
-				device->Present(nullptr, nullptr, 0, nullptr);
-		}
-
-		backbuffer->Release();
+			device->Present(nullptr, nullptr, 0, nullptr);
 	}
 
-	~D3D9Present()
-	{
-		if (surface) surface->Release();
-		if (device) device->Release();
-		if (d3d9) d3d9->Release();
-	}
-
-private:
-	int SrcWidth = 0;
-	int SrcHeight = 0;
-	int ClientWidth = 0;
-	int ClientHeight = 0;
-
-	IDirect3D9 *d3d9 = nullptr;
-	IDirect3DDevice9 *device = nullptr;
-	IDirect3DSurface9 *surface = nullptr;
-};
-
-void I_PresentPolyImage(int w, int h, const void *pixels)
-{
-	static D3D9Present present;
-	present.Present(w, h, pixels);
+	backbuffer->Release();
 }
 
-#else
-
-void I_PresentPolyImage(int w, int h, const void *pixels)
+void I_PolyPresentDeinit()
 {
-	BITMAPV5HEADER info = {};
-	info.bV5Size = sizeof(BITMAPV5HEADER);
-	info.bV5Width = w;
-	info.bV5Height = -h;
-	info.bV5Planes = 1;
-	info.bV5BitCount = 32;
-	info.bV5Compression = BI_RGB;
-	info.bV5SizeImage = 0;
-	info.bV5CSType = LCS_WINDOWS_COLOR_SPACE;
-
-	RECT box = {};
-	GetClientRect(Window, &box);
-
-	HDC dc = GetDC(Window);
-	if (box.right == w && box.bottom == h)
-		SetDIBitsToDevice(dc, 0, 0, w, h, 0, 0, 0, h, pixels, (const BITMAPINFO *)&info, DIB_RGB_COLORS);
-	else
-		StretchDIBits(dc, 0, 0, box.right, box.bottom, 0, 0, w, h, pixels, (const BITMAPINFO *)&info, DIB_RGB_COLORS, SRCCOPY);
-	ReleaseDC(Window, dc);
+	if (surface) surface->Release();
+	if (device) device->Release();
+	if (d3d9) d3d9->Release();
 }
-
-#endif