Added AlternatePixelCenter setting

DDrawCompat/Config/Config.cpp

@@ -2,6 +2,7 @@
 
 namespace Config
 {
+	Settings::AlternatePixelCenter alternatePixelCenter;
 	Settings::CpuAffinity cpuAffinity;
 	Settings::DesktopColorDepth desktopColorDepth;
 	Settings::DisplayFilter displayFilter;

DDrawCompat/Config/Config.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <Config/Settings/AlternatePixelCenter.h>
 #include <Config/Settings/CpuAffinity.h>
 #include <Config/Settings/DesktopColorDepth.h>
 #include <Config/Settings/DisplayFilter.h>
@@ -13,6 +14,7 @@ namespace Config
 	const unsigned evictionTimeout = 200;
 	const unsigned maxPaletteUpdatesPerMs = 5;
 
+	extern Settings::AlternatePixelCenter alternatePixelCenter;
 	extern Settings::CpuAffinity cpuAffinity;
 	extern Settings::DesktopColorDepth desktopColorDepth;
 	extern Settings::DisplayFilter displayFilter;

DDrawCompat/Config/Settings/AlternatePixelCenter.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <Config/MappedSetting.h>
+
+namespace Config
+{
+	namespace Settings
+	{
+		class AlternatePixelCenter : public MappedSetting<float>
+		{
+		public:
+			AlternatePixelCenter()
+				: MappedSetting("AlternatePixelCenter", "off", { {"off", 0.0f}, {"on", -0.5f} })
+			{
+			}
+		};
+	}
+}

DDrawCompat/D3dDdi/DrawPrimitive.cpp

@@ -1,6 +1,7 @@
 #include <algorithm>
 
 #include <Common/Log.h>
+#include <Config/Config.h>
 #include <D3dDdi/DrawPrimitive.h>
 #include <D3dDdi/Device.h>
 #include <D3dDdi/Resource.h>
@@ -618,6 +619,7 @@ namespace D3dDdi
 		auto vertices = m_batched.vertices.data();
 		if (!m_isHwVertexProcessingUsed)
 		{
+			const float pixelOffset = Config::alternatePixelCenter.get();
 			UINT offset = 0;
 			for (UINT i = 0; i < count; ++i)
 			{
@@ -626,6 +628,8 @@ namespace D3dDdi
 				{
 					v->rhw = 1;
 				}
+				v->sx += pixelOffset;
+				v->sy += pixelOffset;
 				offset += m_streamSource.stride;
 			}
 		}

DDrawCompat/DDrawCompat.vcxproj

@@ -213,6 +213,7 @@
     <ClInclude Include="Config\MappedSetting.h" />
     <ClInclude Include="Config\Parser.h" />
     <ClInclude Include="Config\Setting.h" />
+    <ClInclude Include="Config\Settings\AlternatePixelCenter.h" />
     <ClInclude Include="Config\Settings\CpuAffinity.h" />
     <ClInclude Include="Config\Settings\DesktopColorDepth.h" />
     <ClInclude Include="Config\Settings\DisplayFilter.h" />

DDrawCompat/DDrawCompat.vcxproj.filters

@@ -447,6 +447,9 @@
     <ClInclude Include="Config\Settings\DisplayFilter.h">
       <Filter>Header Files\Config\Settings</Filter>
     </ClInclude>
+    <ClInclude Include="Config\Settings\AlternatePixelCenter.h">
+      <Filter>Header Files\Config\Settings</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="Gdi\Gdi.cpp">