diff --git a/DDrawCompat/Common/CompatVtable.h b/DDrawCompat/Common/CompatVtable.h
index 9f6d9f6..e73c6f9 100644
--- a/DDrawCompat/Common/CompatVtable.h
+++ b/DDrawCompat/Common/CompatVtable.h
@@ -28,7 +28,7 @@ public:
 	{
 		static unsigned origVtableSize = 0;
 		auto vtableSize = getVtableSize(version);
-		memcpy(const_cast<Vtable*>(&vtable), &s_origVtable, min(vtableSize, origVtableSize));
+		memcpy(const_cast<Vtable*>(&vtable), &s_origVtable, std::min(vtableSize, origVtableSize));
 
 		class NullLock {};
 		hookVtable<NullLock>(vtable, version);
diff --git a/DDrawCompat/Common/Vector.h b/DDrawCompat/Common/Vector.h
new file mode 100644
index 0000000..5d00c8b
--- /dev/null
+++ b/DDrawCompat/Common/Vector.h
@@ -0,0 +1,141 @@
+#pragma once
+
+#include <algorithm>
+#include <array>
+#include <cmath>
+
+#include <Windows.h>
+
+template <typename Elem, std::size_t size>
+class VectorRepresentation
+{
+private:
+	Elem values[size];
+};
+
+template <typename Elem>
+class VectorRepresentation<Elem, 2>
+{
+public:
+	Elem x;
+	Elem y;
+};
+
+template <typename Elem, std::size_t size>
+class Vector : public VectorRepresentation<Elem, size>
+{
+public:
+	template <typename... Values>
+	Vector(Values... v)
+	{
+		asArray() = { static_cast<Elem>(v)... };
+	}
+
+	Vector(SIZE s) : Vector(s.cx, s.cy)
+	{
+	}
+
+	template <typename OtherElem>
+	Vector(const Vector<OtherElem, size>& other)
+	{
+		for (std::size_t i = 0; i < size; ++i)
+		{
+			(*this)[i] = static_cast<Elem>(other[i]);
+		}
+	}
+
+	template <typename Value>
+	Vector(Value v)
+	{
+		asArray().fill(static_cast<Elem>(v));
+	}
+
+	Elem& operator[](std::size_t index)
+	{
+		return asArray()[index];
+	}
+
+	const Elem& operator[](std::size_t index) const
+	{
+		return const_cast<Vector*>(this)->asArray()[index];
+	}
+
+#define DEFINE_COMPOUND_ASSIGNMENT_OPERATOR(op) \
+	Vector& operator##op##=(const Vector& other) \
+	{ \
+		return *this = *this op other; \
+	}
+
+	DEFINE_COMPOUND_ASSIGNMENT_OPERATOR(+);
+	DEFINE_COMPOUND_ASSIGNMENT_OPERATOR(-);
+	DEFINE_COMPOUND_ASSIGNMENT_OPERATOR(*);
+	DEFINE_COMPOUND_ASSIGNMENT_OPERATOR(/);
+
+#undef DEFINE_COMPOUND_ASSIGNMENT_OPERATOR
+
+private:
+	std::array<Elem, size>& asArray()
+	{
+		return *reinterpret_cast<std::array<Elem, size>*>(this);
+	}
+};
+
+template <typename Elem, std::size_t size, typename Operator>
+Vector<Elem, size> binaryOperation(Operator op, const Vector<Elem, size>& lhs, const Vector<Elem, size>& rhs)
+{
+	Vector<Elem, size> result;
+	for (std::size_t i = 0; i < size; ++i)
+	{
+		result[i] = op(lhs[i], rhs[i]);
+	}
+	return result;
+}
+
+template <typename Elem, std::size_t size, typename Operator>
+Vector<Elem, size> unaryOperation(Operator op, const Vector<Elem, size>& vec)
+{
+	Vector<Elem, size> result;
+	for (std::size_t i = 0; i < size; ++i)
+	{
+		result[i] = op(vec[i]);
+	}
+	return result;
+}
+
+#define DEFINE_VECTOR_BINARY_OPERATOR(name, ...) \
+	template <typename Elem, std::size_t size> \
+	inline Vector<Elem, size> name(const Vector<Elem, size>& lhs, const Vector<Elem, size>& rhs) \
+	{ \
+		return binaryOperation([](Elem x, Elem y) { return __VA_ARGS__; }, lhs, rhs); \
+	}
+
+#define DEFINE_VECTOR_UNARY_OPERATOR(name, ...) \
+	template <typename Elem, std::size_t size> \
+	inline Vector<Elem, size> name(const Vector<Elem, size>& vec) \
+	{ \
+		return unaryOperation([](Elem x) { return __VA_ARGS__; }, vec); \
+	}
+
+#define DEFINE_VECTOR_BUILTIN_BINARY_OPERATOR(op) DEFINE_VECTOR_BINARY_OPERATOR(operator ## op, x op y)
+#define DEFINE_VECTOR_STD_BINARY_OPERATOR(op) DEFINE_VECTOR_BINARY_OPERATOR(op, std::op(x, y))
+#define DEFINE_VECTOR_STD_UNARY_OPERATOR(op) DEFINE_VECTOR_UNARY_OPERATOR(op, std::op(x))
+
+DEFINE_VECTOR_BUILTIN_BINARY_OPERATOR(+);
+DEFINE_VECTOR_BUILTIN_BINARY_OPERATOR(-);
+DEFINE_VECTOR_BUILTIN_BINARY_OPERATOR(*);
+DEFINE_VECTOR_BUILTIN_BINARY_OPERATOR(/);
+
+DEFINE_VECTOR_STD_BINARY_OPERATOR(max);
+DEFINE_VECTOR_STD_BINARY_OPERATOR(min);
+
+DEFINE_VECTOR_STD_UNARY_OPERATOR(ceil);
+DEFINE_VECTOR_STD_UNARY_OPERATOR(floor);
+
+#undef DEFINE_VECTOR_BINARY_OPERATOR
+#undef DEFINE_VECTOR_UNARY_OPERATOR
+#undef DEFINE_VECTOR_BUILTIN_BINARY_OPERATOR
+#undef DEFINE_VECTOR_STD_BINARY_OPERATOR
+#undef DEFINE_VECTOR_STD_UNARY_OPERATOR
+
+typedef Vector<float, 2> Float2;
+typedef Vector<int, 2> Int2;
diff --git a/DDrawCompat/Config/Config.cpp b/DDrawCompat/Config/Config.cpp
index 9d310ce..56ec5a3 100644
--- a/DDrawCompat/Config/Config.cpp
+++ b/DDrawCompat/Config/Config.cpp
@@ -8,6 +8,7 @@
 #include <Config/Settings/CpuAffinityRotation.h>
 #include <Config/Settings/DepthFormat.h>
 #include <Config/Settings/DesktopColorDepth.h>
+#include <Config/Settings/DisplayAspectRatio.h>
 #include <Config/Settings/DisplayFilter.h>
 #include <Config/Settings/DisplayRefreshRate.h>
 #include <Config/Settings/DisplayResolution.h>
@@ -48,6 +49,7 @@ namespace Config
 	Settings::CpuAffinity cpuAffinity;
 	Settings::CpuAffinityRotation cpuAffinityRotation;
 	Settings::DepthFormat depthFormat;
+	Settings::DisplayAspectRatio displayAspectRatio;
 	Settings::DesktopColorDepth desktopColorDepth;
 	Settings::DisplayFilter displayFilter;
 	Settings::DisplayRefreshRate displayRefreshRate;
diff --git a/DDrawCompat/Config/Parser.cpp b/DDrawCompat/Config/Parser.cpp
index a37e141..628c0b1 100644
--- a/DDrawCompat/Config/Parser.cpp
+++ b/DDrawCompat/Config/Parser.cpp
@@ -150,6 +150,23 @@ namespace Config
 			}
 		}
 
+		SIZE parseAspectRatio(const std::string& value)
+		{
+			try
+			{
+				auto pos = value.find(':');
+				if (pos != std::string::npos)
+				{
+					return { parseInt(value.substr(0, pos), 1, MAXUINT16), parseInt(value.substr(pos + 1), 1, MAXUINT16) };
+				}
+			}
+			catch (ParsingError&)
+			{
+			}
+
+			throw ParsingError("invalid aspect ratio: '" + value + "'");
+		}
+
 		int parseInt(const std::string& value, int min, int max)
 		{
 			if (value.empty() || std::string::npos != value.find_first_not_of("+-0123456789") ||
diff --git a/DDrawCompat/Config/Parser.h b/DDrawCompat/Config/Parser.h
index 35973a0..9063542 100644
--- a/DDrawCompat/Config/Parser.h
+++ b/DDrawCompat/Config/Parser.h
@@ -20,8 +20,9 @@ namespace Config
 	{
 		std::filesystem::path getOverlayConfigPath();
 		void loadAllConfigFiles(const std::filesystem::path& processPath);
-		SIZE parseResolution(const std::string& value);
+		SIZE parseAspectRatio(const std::string& value);
 		int parseInt(const std::string& value, int min, int max);
+		SIZE parseResolution(const std::string& value);
 		void registerSetting(Setting& setting);
 		std::string removeParam(const std::string& value);
 		std::string tolower(const std::string& str);
diff --git a/DDrawCompat/Config/Settings/DisplayAspectRatio.cpp b/DDrawCompat/Config/Settings/DisplayAspectRatio.cpp
new file mode 100644
index 0000000..321463b
--- /dev/null
+++ b/DDrawCompat/Config/Settings/DisplayAspectRatio.cpp
@@ -0,0 +1,39 @@
+#include <Config/Settings/DisplayAspectRatio.h>
+
+namespace Config
+{
+	namespace Settings
+	{
+		DisplayAspectRatio::DisplayAspectRatio()
+			: MappedSetting("DisplayAspectRatio", "app", { {"app", APP}, {"display", DISPLAY} })
+		{
+		}
+
+		std::string DisplayAspectRatio::getValueStr() const
+		{
+			try
+			{
+				return MappedSetting::getValueStr();
+			}
+			catch (const ParsingError&)
+			{
+				return std::to_string(m_value.cx) + ':' + std::to_string(m_value.cy);
+			}
+		}
+
+		void DisplayAspectRatio::setValue(const std::string& value)
+		{
+			try
+			{
+				MappedSetting::setValue(value);
+			}
+			catch (const ParsingError&)
+			{
+				m_value = Parser::parseAspectRatio(value);
+			}
+		}
+
+		const SIZE DisplayAspectRatio::APP = { 0, 0 };
+		const SIZE DisplayAspectRatio::DISPLAY = { 1, 0 };
+	}
+}
diff --git a/DDrawCompat/Config/Settings/DisplayAspectRatio.h b/DDrawCompat/Config/Settings/DisplayAspectRatio.h
new file mode 100644
index 0000000..3bedb96
--- /dev/null
+++ b/DDrawCompat/Config/Settings/DisplayAspectRatio.h
@@ -0,0 +1,27 @@
+#pragma once
+
+#include <Windows.h>
+
+#include <Common/Comparison.h>
+#include <Config/MappedSetting.h>
+
+namespace Config
+{
+	namespace Settings
+	{
+		class DisplayAspectRatio : public MappedSetting<SIZE>
+		{
+		public:
+			static const SIZE APP;
+			static const SIZE DISPLAY;
+
+			DisplayAspectRatio();
+
+		protected:
+			std::string getValueStr() const override;
+			void setValue(const std::string& value) override;
+		};
+	}
+
+	extern Settings::DisplayAspectRatio displayAspectRatio;
+}
diff --git a/DDrawCompat/D3dDdi/Adapter.cpp b/DDrawCompat/D3dDdi/Adapter.cpp
index 5b34cd1..7d4769d 100644
--- a/DDrawCompat/D3dDdi/Adapter.cpp
+++ b/DDrawCompat/D3dDdi/Adapter.cpp
@@ -5,6 +5,7 @@
 #include <Common/Comparison.h>
 #include <Common/CompatVtable.h>
 #include <Config/Settings/Antialiasing.h>
+#include <Config/Settings/DisplayAspectRatio.h>
 #include <Config/Settings/PalettizedTextures.h>
 #include <Config/Settings/ResolutionScale.h>
 #include <Config/Settings/SupportedDepthFormats.h>
@@ -15,6 +16,7 @@
 #include <D3dDdi/DeviceFuncs.h>
 #include <D3dDdi/FormatInfo.h>
 #include <D3dDdi/KernelModeThunks.h>
+#include <Win32/DisplayMode.h>
 
 namespace
 {
@@ -59,6 +61,25 @@ namespace D3dDdi
 	{
 	}
 
+	Int2 Adapter::getAspectRatio(Win32::DisplayMode::Resolution res) const
+	{
+		SIZE ar = Config::displayAspectRatio.get();
+		if (Config::Settings::DisplayAspectRatio::APP == ar)
+		{
+			return 0 != res.app.cx ? res.app : Win32::DisplayMode::getAppResolution(m_deviceName);
+		}
+		else if (Config::Settings::DisplayAspectRatio::DISPLAY == ar)
+		{
+			return 0 != res.display.cx ? res.display : Win32::DisplayMode::getDisplayResolution(m_deviceName);
+		}
+		return ar;
+	}
+
+	Int2 Adapter::getAspectRatio() const
+	{
+		return getAspectRatio({});
+	}
+
 	const Adapter::AdapterInfo& Adapter::getInfo() const
 	{
 		auto it = s_adapterInfos.find(m_luid);
@@ -122,14 +143,6 @@ namespace D3dDdi
 		return result;
 	}
 
-	float Adapter::getMaxScaleFactor(SIZE size) const
-	{
-		const auto& caps = getInfo().d3dExtendedCaps;
-		const float scaleX = static_cast<float>(caps.dwMaxTextureWidth) / size.cx;
-		const float scaleY = static_cast<float>(caps.dwMaxTextureHeight) / size.cy;
-		return min(scaleX, scaleY);
-	}
-
 	std::pair<D3DDDIMULTISAMPLE_TYPE, UINT> Adapter::getMultisampleConfig(D3DDDIFORMAT format) const
 	{
 		UINT samples = Config::antialiasing.get();
@@ -154,54 +167,62 @@ namespace D3dDdi
 		levels.Format = D3DDDIFMT_X8R8G8B8;
 		levels.MsType = static_cast<D3DDDIMULTISAMPLE_TYPE>(samples);
 		getCaps(D3DDDICAPS_GETMULTISAMPLEQUALITYLEVELS, levels);
-		return { levels.MsType, min(static_cast<UINT>(Config::antialiasing.getParam()), levels.QualityLevels - 1) };
+		return { levels.MsType, std::min(static_cast<UINT>(Config::antialiasing.getParam()), levels.QualityLevels - 1) };
 	}
 
-	SIZE Adapter::getScaledSize(SIZE size) const
+	SIZE Adapter::getScaledSize(Int2 size) const
 	{
-		DEVMODEW dm = {};
-		dm.dmSize = sizeof(dm);
-		EnumDisplaySettingsExW(m_deviceName.c_str(), ENUM_CURRENT_SETTINGS, &dm, 0);
-
-		const SIZE emulatedDisplaySize = { static_cast<long>(dm.dmPelsHeight), static_cast<long>(dm.dmPelsHeight) };
-		const float displayMaxScaleFactor = getMaxScaleFactor(emulatedDisplaySize);
-		const float resourceMaxScaleFactor = getMaxScaleFactor(size);
-		float maxScaleFactor = min(displayMaxScaleFactor, resourceMaxScaleFactor);
-		if (Config::resolutionScale.getParam() > 0)
-		{
-			maxScaleFactor = floor(maxScaleFactor);
-		}
-
-		SIZE baseSize = Config::resolutionScale.get();
+		const auto scaleFactor = getScaleFactor();
 		const int multiplier = Config::resolutionScale.getParam();
-
-		if (Config::Settings::ResolutionScale::APP == baseSize)
-		{
-			baseSize = emulatedDisplaySize;
-		}
-		else if (Config::Settings::ResolutionScale::DISPLAY == baseSize)
-		{
-			CALL_ORIG_FUNC(EnumDisplaySettingsExW)(m_deviceName.c_str(), ENUM_CURRENT_SETTINGS, &dm, 0);
-			baseSize = { static_cast<long>(dm.dmPelsHeight), static_cast<long>(dm.dmPelsHeight) };
-		}
-
-		float scaleX = static_cast<float>(baseSize.cx) / emulatedDisplaySize.cx;
-		float scaleY = static_cast<float>(baseSize.cy) / emulatedDisplaySize.cy;
-		float scale = min(scaleX, scaleY) * abs(multiplier);
-		if (multiplier > 0)
-		{
-			scale = ceil(scale);
-		}
-		scale = max(scale, 1.0f);
-		scale = min(scale, maxScaleFactor);
-
-		size.cx = static_cast<LONG>(size.cx * scale);
-		size.cy = static_cast<LONG>(size.cy * scale);
-
 		const auto& caps = getInfo().d3dExtendedCaps;
-		size.cx = min(size.cx, static_cast<LONG>(caps.dwMaxTextureWidth));
-		size.cy = min(size.cy, static_cast<LONG>(caps.dwMaxTextureHeight));
-		return size;
+
+		Int2 maxSize = { caps.dwMaxTextureWidth, caps.dwMaxTextureHeight };
+		if (multiplier < 0)
+		{
+			maxSize = maxSize / size * size;
+		}
+
+		Int2 scaledSize = Float2(size) * scaleFactor;
+		scaledSize = min(scaledSize, maxSize);
+		scaledSize = max(scaledSize, size);
+		return { scaledSize.x, scaledSize.y };
+	}
+
+	Float2 Adapter::getScaleFactor() const
+	{
+		const SIZE resolutionScale = Config::resolutionScale.get();
+		const int multiplier = Config::resolutionScale.getParam();
+		if (0 == multiplier ||
+			Config::Settings::ResolutionScale::APP == resolutionScale && 1 == multiplier)
+		{
+			return 1;
+		}
+
+		const auto res = Win32::DisplayMode::getResolution(m_deviceName);
+		Int2 targetResolution = resolutionScale;
+		if (Config::Settings::ResolutionScale::APP == resolutionScale)
+		{
+			targetResolution = res.app;
+		}
+		else if (Config::Settings::ResolutionScale::DISPLAY == resolutionScale)
+		{
+			targetResolution = res.display;
+		}
+
+		targetResolution *= abs(multiplier);
+
+		const Int2 ar = getAspectRatio(res);
+		if (targetResolution.y * ar.x / ar.y <= targetResolution.x)
+		{
+			targetResolution.x = targetResolution.y * ar.x / ar.y;
+		}
+		else
+		{
+			targetResolution.y = targetResolution.x * ar.y / ar.x;
+		}
+
+		const auto scaleFactor = Float2(targetResolution) / Float2(res.app);
+		return multiplier < 0 ? scaleFactor : ceil(scaleFactor);
 	}
 
 	std::string Adapter::getSupportedMsaaModes(const std::map<D3DDDIFORMAT, FORMATOP>& formatOps) const
diff --git a/DDrawCompat/D3dDdi/Adapter.h b/DDrawCompat/D3dDdi/Adapter.h
index 97a78e8..6ec562d 100644
--- a/DDrawCompat/D3dDdi/Adapter.h
+++ b/DDrawCompat/D3dDdi/Adapter.h
@@ -8,7 +8,9 @@
 #include <d3dumddi.h>
 
 #include <Common/CompatPtr.h>
+#include <Common/Vector.h>
 #include <DDraw/DirectDraw.h>
+#include <Win32/DisplayMode.h>
 
 namespace D3dDdi
 {
@@ -31,12 +33,13 @@ namespace D3dDdi
 
 		operator HANDLE() const { return m_adapter; }
 
+		Int2 getAspectRatio() const;
 		const AdapterInfo& getInfo() const;
 		LUID getLuid() const { return m_luid; }
 		std::pair<D3DDDIMULTISAMPLE_TYPE, UINT> getMultisampleConfig(D3DDDIFORMAT format) const;
 		const D3DDDI_ADAPTERFUNCS& getOrigVtable() const { return m_origVtable; }
 		CompatWeakPtr<IDirectDraw7> getRepository() const { return m_repository; }
-		SIZE getScaledSize(SIZE size) const;
+		SIZE getScaledSize(Int2 size) const;
 
 		HRESULT pfnCloseAdapter();
 		HRESULT pfnCreateDevice(D3DDDIARG_CREATEDEVICE* pCreateData);
@@ -50,8 +53,9 @@ namespace D3dDdi
 		template <typename Data>
 		HRESULT getCaps(D3DDDICAPS_TYPE type, Data& data, UINT size = sizeof(Data)) const;
 
+		Int2 getAspectRatio(Win32::DisplayMode::Resolution res) const;
 		std::map<D3DDDIFORMAT, FORMATOP> getFormatOps() const;
-		float getMaxScaleFactor(SIZE size) const;
+		Float2 getScaleFactor() const;
 		std::string getSupportedMsaaModes(const std::map<D3DDDIFORMAT, FORMATOP>& formatOps) const;
 		DWORD getSupportedZBufferBitDepths(const std::map<D3DDDIFORMAT, FORMATOP>& formatOps) const;
 
diff --git a/DDrawCompat/D3dDdi/DeviceState.cpp b/DDrawCompat/D3dDdi/DeviceState.cpp
index dd15817..cf6c5ba 100644
--- a/DDrawCompat/D3dDdi/DeviceState.cpp
+++ b/DDrawCompat/D3dDdi/DeviceState.cpp
@@ -223,7 +223,7 @@ namespace D3dDdi
 		m_changedStates |= CS_TEXTURE_STAGE;
 		m_changedTextureStageStates[stage].set(D3DDDITSS_ADDRESSU);
 		m_changedTextureStageStates[stage].set(D3DDDITSS_ADDRESSV);
-		m_maxChangedTextureStage = max(stage, m_maxChangedTextureStage);
+		m_maxChangedTextureStage = std::max(stage, m_maxChangedTextureStage);
 	}
 
 	void DeviceState::flush()
@@ -502,7 +502,7 @@ namespace D3dDdi
 		m_changedRenderStates.set(D3DDDIRS_COLORKEYENABLE);
 		m_changedTextureStageStates[stage].set(D3DDDITSS_ADDRESSU);
 		m_changedTextureStageStates[stage].set(D3DDDITSS_ADDRESSV);
-		m_maxChangedTextureStage = max(stage, m_maxChangedTextureStage);
+		m_maxChangedTextureStage = std::max(stage, m_maxChangedTextureStage);
 		return S_OK;
 	}
 
@@ -514,7 +514,7 @@ namespace D3dDdi
 			m_app.textureStageState[data->Stage][D3DDDITSS_ADDRESSV] = data->Value;
 			m_changedTextureStageStates[data->Stage].set(D3DDDITSS_ADDRESSU);
 			m_changedTextureStageStates[data->Stage].set(D3DDDITSS_ADDRESSV);
-			m_maxChangedTextureStage = max(data->Stage, m_maxChangedTextureStage);
+			m_maxChangedTextureStage = std::max(data->Stage, m_maxChangedTextureStage);
 			return S_OK;
 		}
 		
@@ -531,7 +531,7 @@ namespace D3dDdi
 
 		m_app.textureStageState[data->Stage][data->State] = data->Value;
 		m_changedTextureStageStates[data->Stage].set(data->State);
-		m_maxChangedTextureStage = max(data->Stage, m_maxChangedTextureStage);
+		m_maxChangedTextureStage = std::max(data->Stage, m_maxChangedTextureStage);
 		return S_OK;
 	}
 
@@ -775,7 +775,7 @@ namespace D3dDdi
 	{
 		setTexture(stage, texture);
 		m_changedStates |= CS_TEXTURE_STAGE;
-		m_maxChangedTextureStage = max(stage, m_maxChangedTextureStage);
+		m_maxChangedTextureStage = std::max(stage, m_maxChangedTextureStage);
 	}
 
 	void DeviceState::setTempTextureStageState(const D3DDDIARG_TEXTURESTAGESTATE& tss)
@@ -783,7 +783,7 @@ namespace D3dDdi
 		setTextureStageState(tss);
 		m_changedStates |= CS_TEXTURE_STAGE;
 		m_changedTextureStageStates[tss.Stage].set(tss.State);
-		m_maxChangedTextureStage = max(tss.Stage, m_maxChangedTextureStage);
+		m_maxChangedTextureStage = std::max(tss.Stage, m_maxChangedTextureStage);
 	}
 
 	void DeviceState::setTempVertexShaderDecl(HANDLE decl)
diff --git a/DDrawCompat/D3dDdi/KernelModeThunks.cpp b/DDrawCompat/D3dDdi/KernelModeThunks.cpp
index 5e34b58..7e67006 100644
--- a/DDrawCompat/D3dDdi/KernelModeThunks.cpp
+++ b/DDrawCompat/D3dDdi/KernelModeThunks.cpp
@@ -222,13 +222,13 @@ namespace
 				const ULONGLONG maxMem = 0x3FFF0000;
 				if (info->DedicatedVideoMemorySize < maxMem)
 				{
-					auto addedMem = min(maxMem - info->DedicatedVideoMemorySize, info->SharedSystemMemorySize);
+					auto addedMem = std::min(maxMem - info->DedicatedVideoMemorySize, info->SharedSystemMemorySize);
 					info->DedicatedVideoMemorySize += addedMem;
 					info->SharedSystemMemorySize -= addedMem;
 				}
 
-				info->DedicatedVideoMemorySize = min(info->DedicatedVideoMemorySize, maxMem);
-				info->SharedSystemMemorySize = min(info->SharedSystemMemorySize, maxMem);
+				info->DedicatedVideoMemorySize = std::min(info->DedicatedVideoMemorySize, maxMem);
+				info->SharedSystemMemorySize = std::min(info->SharedSystemMemorySize, maxMem);
 				break;
 			}
 			}
diff --git a/DDrawCompat/D3dDdi/Resource.cpp b/DDrawCompat/D3dDdi/Resource.cpp
index e833af2..7d238b0 100644
--- a/DDrawCompat/D3dDdi/Resource.cpp
+++ b/DDrawCompat/D3dDdi/Resource.cpp
@@ -59,11 +59,6 @@ namespace
 		return rect;
 	}
 
-	RECT calculatePresentationRect()
-	{
-		return calculateScaledRect(DDraw::PrimarySurface::getMonitorRect(), DDraw::RealPrimarySurface::getMonitorRect());
-	}
-
 	LONG divCeil(LONG n, LONG d)
 	{
 		return (n + d - 1) / d;
@@ -669,8 +664,8 @@ namespace D3dDdi
 	{
 		while (srcWidth > 2 * dstWidth || srcHeight > 2 * dstHeight)
 		{
-			const LONG newSrcWidth = max(dstWidth, (srcWidth + 1) / 2);
-			const LONG newSrcHeight = max(dstHeight, (srcHeight + 1) / 2);
+			const LONG newSrcWidth = std::max(dstWidth, (srcWidth + 1) / 2);
+			const LONG newSrcHeight = std::max(dstHeight, (srcHeight + 1) / 2);
 			auto& nextRt = getNextRenderTarget(rt, newSrcWidth, newSrcHeight);
 			if (!nextRt.resource)
 			{
@@ -1444,7 +1439,8 @@ namespace D3dDdi
 
 		if (isFullscreen)
 		{
-			g_presentationRect = calculatePresentationRect();
+			const Int2 ar = m_device.getAdapter().getAspectRatio();
+			g_presentationRect = calculateScaledRect({ 0, 0, ar.x, ar.y }, DDraw::RealPrimarySurface::getMonitorRect());
 			auto& si = m_origData.pSurfList[0];
 			RECT primaryRect = { 0, 0, static_cast<LONG>(si.Width), static_cast<LONG>(si.Height) };
 
diff --git a/DDrawCompat/D3dDdi/SurfaceRepository.cpp b/DDrawCompat/D3dDdi/SurfaceRepository.cpp
index c84fc6b..7e82924 100644
--- a/DDrawCompat/D3dDdi/SurfaceRepository.cpp
+++ b/DDrawCompat/D3dDdi/SurfaceRepository.cpp
@@ -261,7 +261,8 @@ namespace D3dDdi
 	SurfaceRepository::Surface& SurfaceRepository::getTempSurface(Surface& surface, DWORD width, DWORD height,
 		D3DDDIFORMAT format, DWORD caps, UINT surfaceCount)
 	{
-		return getSurface(surface, max(width, surface.width), max(height, surface.height), format, caps, surfaceCount);
+		return getSurface(surface, std::max(width, surface.width), std::max(height, surface.height),
+			format, caps, surfaceCount);
 	}
 
 	SurfaceRepository::Surface& SurfaceRepository::getTempSysMemSurface(DWORD width, DWORD height)
diff --git a/DDrawCompat/DDrawCompat.vcxproj b/DDrawCompat/DDrawCompat.vcxproj
index cebe649..4b9bf29 100644
--- a/DDrawCompat/DDrawCompat.vcxproj
+++ b/DDrawCompat/DDrawCompat.vcxproj
@@ -63,7 +63,7 @@
       <PrecompiledHeader>
       </PrecompiledHeader>
       <WarningLevel>Level4</WarningLevel>
-      <PreprocessorDefinitions>WIN32_LEAN_AND_MEAN;CINTERFACE;_NO_DDRAWINT_NO_COM;PSAPI_VERSION=1;WIN32;_DEBUG;_WINDOWS;_USRDLL;DDRAWCOMPAT_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32_LEAN_AND_MEAN;NOMINMAX;CINTERFACE;_NO_DDRAWINT_NO_COM;PSAPI_VERSION=1;WIN32;_DEBUG;_WINDOWS;_USRDLL;DDRAWCOMPAT_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
       <ObjectFileName>$(IntDir)%(RelativeDir)</ObjectFileName>
@@ -101,7 +101,7 @@
       <PrecompiledHeader>
       </PrecompiledHeader>
       <WarningLevel>Level4</WarningLevel>
-      <PreprocessorDefinitions>WIN32_LEAN_AND_MEAN;CINTERFACE;_NO_DDRAWINT_NO_COM;PSAPI_VERSION=1;WIN32;NDEBUG;_WINDOWS;_USRDLL;DDRAWCOMPAT_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32_LEAN_AND_MEAN;NOMINMAX;CINTERFACE;_NO_DDRAWINT_NO_COM;PSAPI_VERSION=1;WIN32;NDEBUG;_WINDOWS;_USRDLL;DDRAWCOMPAT_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
       <ObjectFileName>$(IntDir)%(RelativeDir)</ObjectFileName>
@@ -146,6 +146,7 @@
     <ClInclude Include="Common\Rect.h" />
     <ClInclude Include="Common\ScopedSrwLock.h" />
     <ClInclude Include="Common\ScopedThreadPriority.h" />
+    <ClInclude Include="Common\Vector.h" />
     <ClInclude Include="Common\VtableHookVisitor.h" />
     <ClInclude Include="Common\VtableSizeVisitor.h" />
     <ClInclude Include="Common\VtableVisitor.h" />
@@ -169,6 +170,7 @@
     <ClInclude Include="Config\Settings\CpuAffinityRotation.h" />
     <ClInclude Include="Config\Settings\DepthFormat.h" />
     <ClInclude Include="Config\Settings\DesktopColorDepth.h" />
+    <ClInclude Include="Config\Settings\DisplayAspectRatio.h" />
     <ClInclude Include="Config\Settings\DisplayFilter.h" />
     <ClInclude Include="Config\Settings\DisplayRefreshRate.h" />
     <ClInclude Include="Config\Settings\DisplayResolution.h" />
@@ -330,6 +332,7 @@
     <ClCompile Include="Config\Setting.cpp" />
     <ClCompile Include="Config\Settings\Antialiasing.cpp" />
     <ClCompile Include="Config\Settings\CpuAffinity.cpp" />
+    <ClCompile Include="Config\Settings\DisplayAspectRatio.cpp" />
     <ClCompile Include="Config\Settings\DisplayFilter.cpp" />
     <ClCompile Include="Config\Settings\DisplayRefreshRate.cpp" />
     <ClCompile Include="Config\Settings\DisplayResolution.cpp" />
diff --git a/DDrawCompat/DDrawCompat.vcxproj.filters b/DDrawCompat/DDrawCompat.vcxproj.filters
index c092d4a..072379a 100644
--- a/DDrawCompat/DDrawCompat.vcxproj.filters
+++ b/DDrawCompat/DDrawCompat.vcxproj.filters
@@ -651,6 +651,12 @@
     <ClInclude Include="Config\Settings\DepthFormat.h">
       <Filter>Header Files\Config\Settings</Filter>
     </ClInclude>
+    <ClInclude Include="Config\Settings\DisplayAspectRatio.h">
+      <Filter>Header Files\Config\Settings</Filter>
+    </ClInclude>
+    <ClInclude Include="Common\Vector.h">
+      <Filter>Header Files\Common</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="Gdi\Gdi.cpp">
@@ -1028,6 +1034,9 @@
     <ClCompile Include="Config\Settings\SupportedDepthFormats.cpp">
       <Filter>Source Files\Config\Settings</Filter>
     </ClCompile>
+    <ClCompile Include="Config\Settings\DisplayAspectRatio.cpp">
+      <Filter>Source Files\Config\Settings</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ResourceCompile Include="DDrawCompat.rc">
diff --git a/DDrawCompat/Gdi/User32WndProcs.cpp b/DDrawCompat/Gdi/User32WndProcs.cpp
index d480d37..ae30ad7 100644
--- a/DDrawCompat/Gdi/User32WndProcs.cpp
+++ b/DDrawCompat/Gdi/User32WndProcs.cpp
@@ -339,7 +339,7 @@ namespace
 			{
 				RECT parentRect = {};
 				GetWindowRect(parent, &parentRect);
-				wp.x = max(parentRect.left + 3 - wp.cx, 0);
+				wp.x = std::max<int>(parentRect.left + 3 - wp.cx, 0);
 			}
 			else
 			{
diff --git a/DDrawCompat/Gdi/VirtualScreen.cpp b/DDrawCompat/Gdi/VirtualScreen.cpp
index 3ff6e2d..99083fb 100644
--- a/DDrawCompat/Gdi/VirtualScreen.cpp
+++ b/DDrawCompat/Gdi/VirtualScreen.cpp
@@ -42,19 +42,16 @@ namespace
 	BOOL CALLBACK addMonitorRectToRegion(
 		HMONITOR hMonitor, HDC /*hdcMonitor*/, LPRECT lprcMonitor, LPARAM dwData)
 	{
-		MONITORINFOEX mi = {};
+		MONITORINFOEXW mi = {};
 		mi.cbSize = sizeof(mi);
-		CALL_ORIG_FUNC(GetMonitorInfoA)(hMonitor, &mi);
-
-		DEVMODE dm = {};
-		dm.dmSize = sizeof(dm);
-		CALL_ORIG_FUNC(EnumDisplaySettingsExA)(mi.szDevice, ENUM_CURRENT_SETTINGS, &dm, 0);
+		CALL_ORIG_FUNC(GetMonitorInfoW)(hMonitor, &mi);
 
+		auto res = Win32::DisplayMode::getDisplayResolution(mi.szDevice);
 		RECT rect = *lprcMonitor;
-		if (0 != dm.dmPelsWidth && 0 != dm.dmPelsHeight)
+		if (0 != res.cx && 0 != res.cy)
 		{
-			rect.right = rect.left + dm.dmPelsWidth;
-			rect.bottom = rect.top + dm.dmPelsHeight;
+			rect.right = rect.left + res.cx;
+			rect.bottom = rect.top + res.cy;
 		}
 
 		Gdi::Region& virtualScreenRegion = *reinterpret_cast<Gdi::Region*>(dwData);
diff --git a/DDrawCompat/Input/Input.cpp b/DDrawCompat/Input/Input.cpp
index afefc0f..1d436fc 100644
--- a/DDrawCompat/Input/Input.cpp
+++ b/DDrawCompat/Input/Input.cpp
@@ -120,8 +120,8 @@ namespace
 				auto& llHook = *reinterpret_cast<MSLLHOOKSTRUCT*>(lParam);
 				cp.x += (llHook.pt.x - origCp.x);
 				cp.y += (llHook.pt.y - origCp.y);
-				cp.x = min(max(g_monitorRect.left, cp.x), g_monitorRect.right);
-				cp.y = min(max(g_monitorRect.top, cp.y), g_monitorRect.bottom);
+				cp.x = std::min(std::max(g_monitorRect.left, cp.x), g_monitorRect.right);
+				cp.y = std::min(std::max(g_monitorRect.top, cp.y), g_monitorRect.bottom);
 				g_cursorPos = cp;
 				DDraw::RealPrimarySurface::scheduleOverlayUpdate();
 			}
diff --git a/DDrawCompat/Overlay/ScrollBarControl.cpp b/DDrawCompat/Overlay/ScrollBarControl.cpp
index 2fecbae..12fd1cb 100644
--- a/DDrawCompat/Overlay/ScrollBarControl.cpp
+++ b/DDrawCompat/Overlay/ScrollBarControl.cpp
@@ -116,8 +116,8 @@ namespace Overlay
 	{
 		const auto minPos = m_leftArrow.right + ARROW_SIZE / 2;
 		const auto maxPos = m_rightArrow.left - ARROW_SIZE / 2;
-		pos.x = max(pos.x, minPos);
-		pos.x = min(pos.x, maxPos);
+		pos.x = std::max(pos.x, minPos);
+		pos.x = std::min(pos.x, maxPos);
 		setPos(m_min + roundDiv((pos.x - minPos) * (m_max - m_min), maxPos - minPos));
 	}
 
@@ -128,8 +128,8 @@ namespace Overlay
 
 	void ScrollBarControl::setPos(int pos)
 	{
-		pos = max(pos, m_min);
-		pos = min(pos, m_max);
+		pos = std::max(pos, m_min);
+		pos = std::min(pos, m_max);
 		if (pos != m_pos)
 		{
 			m_pos = pos;
diff --git a/DDrawCompat/Overlay/Window.cpp b/DDrawCompat/Overlay/Window.cpp
index b222849..3983bd8 100644
--- a/DDrawCompat/Overlay/Window.cpp
+++ b/DDrawCompat/Overlay/Window.cpp
@@ -206,8 +206,8 @@ namespace Overlay
 
 		int scaleX = (monitorRect.right - monitorRect.left) / 640;
 		int scaleY = (monitorRect.bottom - monitorRect.top) / 480;
-		m_scaleFactor = min(scaleX, scaleY);
-		m_scaleFactor = max(1, m_scaleFactor);
+		m_scaleFactor = std::min(scaleX, scaleY);
+		m_scaleFactor = std::max(1, m_scaleFactor);
 		m_rect = calculateRect({ monitorRect.left / m_scaleFactor, monitorRect.top / m_scaleFactor,
 			monitorRect.right / m_scaleFactor, monitorRect.bottom / m_scaleFactor });
 
diff --git a/DDrawCompat/Win32/DisplayMode.cpp b/DDrawCompat/Win32/DisplayMode.cpp
index 32f2bf5..9be0f98 100644
--- a/DDrawCompat/Win32/DisplayMode.cpp
+++ b/DDrawCompat/Win32/DisplayMode.cpp
@@ -370,6 +370,18 @@ namespace
 		return CALL_ORIG_FUNC(GdiEntry13)() + g_displaySettingsUniquenessBias;
 	}
 
+	SIZE getAppResolution(const std::wstring& deviceName, SIZE displayResolution = {})
+	{
+		{
+			Compat::ScopedSrwLockShared srwLock(g_srwLock);
+			if (deviceName == g_emulatedDisplayMode.deviceName)
+			{
+				return { static_cast<LONG>(g_emulatedDisplayMode.width), static_cast<LONG>(g_emulatedDisplayMode.height) };
+			}
+		}
+		return 0 != displayResolution.cx ? displayResolution : Win32::DisplayMode::getDisplayResolution(deviceName);
+	}
+
 	template <typename Char>
 	DWORD getConfiguredRefreshRate(const Char* deviceName)
 	{
@@ -722,11 +734,24 @@ namespace Win32
 {
 	namespace DisplayMode
 	{
+		SIZE getAppResolution(const std::wstring& deviceName)
+		{
+			return ::getAppResolution(deviceName);
+		}
+
 		DWORD getBpp()
 		{
 			return getEmulatedDisplayMode().bpp;
 		}
 
+		SIZE getDisplayResolution(const std::wstring& deviceName)
+		{
+			DEVMODEW dm = {};
+			dm.dmSize = sizeof(dm);
+			CALL_ORIG_FUNC(EnumDisplaySettingsExW)(deviceName.c_str(), ENUM_CURRENT_SETTINGS, &dm, 0);
+			return { static_cast<LONG>(dm.dmPelsWidth), static_cast<LONG>(dm.dmPelsHeight) };
+		}
+
 		EmulatedDisplayMode getEmulatedDisplayMode()
 		{
 			Compat::ScopedSrwLockShared lock(g_srwLock);
@@ -741,6 +766,14 @@ namespace Win32
 			return mi;
 		}
 
+		Resolution getResolution(const std::wstring& deviceName)
+		{
+			Resolution res = {};
+			res.display = getDisplayResolution(deviceName);
+			res.app = ::getAppResolution(deviceName, res.display);
+			return res;
+		}
+
 		ULONG queryDisplaySettingsUniqueness()
 		{
 			return CALL_ORIG_FUNC(GdiEntry13)();
diff --git a/DDrawCompat/Win32/DisplayMode.h b/DDrawCompat/Win32/DisplayMode.h
index d472c8f..16f579c 100644
--- a/DDrawCompat/Win32/DisplayMode.h
+++ b/DDrawCompat/Win32/DisplayMode.h
@@ -25,9 +25,18 @@ namespace Win32
 			SIZE diff;
 		};
 
+		struct Resolution
+		{
+			SIZE app;
+			SIZE display;
+		};
+
+		SIZE getAppResolution(const std::wstring& deviceName);
 		DWORD getBpp();
+		SIZE getDisplayResolution(const std::wstring& deviceName);
 		EmulatedDisplayMode getEmulatedDisplayMode();
 		MONITORINFOEXW getMonitorInfo(const std::wstring& deviceName);
+		Resolution getResolution(const std::wstring& deviceName);
 		ULONG queryDisplaySettingsUniqueness();
 
 		void installHooks();
diff --git a/DDrawCompat/Win32/Log.cpp b/DDrawCompat/Win32/Log.cpp
index 6fa9a3c..d349f41 100644
--- a/DDrawCompat/Win32/Log.cpp
+++ b/DDrawCompat/Win32/Log.cpp
@@ -93,7 +93,7 @@ namespace
 	std::ostream& logOsVersionInfo(std::ostream& os, const OsVersionInfo& vi)
 	{
 		OsVersionInfoEx viEx = {};
-		memcpy(&viEx, &vi, min(sizeof(viEx), vi.dwOSVersionInfoSize));
+		memcpy(&viEx, &vi, std::min<DWORD>(sizeof(viEx), vi.dwOSVersionInfoSize));
 		return logOsVersionInfoEx(os, viEx);
 	}
 }
diff --git a/DDrawCompat/Win32/Thread.cpp b/DDrawCompat/Win32/Thread.cpp
index 662ee66..ec71f8f 100644
--- a/DDrawCompat/Win32/Thread.cpp
+++ b/DDrawCompat/Win32/Thread.cpp
@@ -140,7 +140,7 @@ namespace
 				oss << i + 1 << ", ";
 			}
 		}
-		return oss.str().substr(0, max(0, oss.str().length() - 2));
+		return oss.str().substr(0, std::max<std::size_t>(0, oss.str().length() - 2));
 	}
 
 	DWORD rotateMask(DWORD mask)