Fixed DLL support for physics Engine

.. hopefully

Code/GamePhysics/DLLMain.cpp

@@ -0,0 +1,11 @@
+#define NOMINMAX
+
+#include <windows.h>
+#include "OysterMath.h"
+
+BOOL WINAPI DllMain( _In_  HINSTANCE hinstDLL,
+					 _In_  DWORD fdwReason,
+					 _In_  LPVOID lpvReserved )
+{
+	return ::Oyster::Math::IsSupported();
+}

Code/GamePhysics/GamePhysics.vcxproj

@@ -90,6 +90,7 @@
       <WarningLevel>Level3</WarningLevel>
       <Optimization>Disabled</Optimization>
       <AdditionalIncludeDirectories>$(SolutionDir)Misc;$(SolutionDir)OysterMath;$(SolutionDir)OysterPhysics3D;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>_WINDLL;DLL_EXPORT;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
     <Link>
       <GenerateDebugInformation>true</GenerateDebugInformation>
@@ -100,6 +101,7 @@
       <WarningLevel>Level3</WarningLevel>
       <Optimization>Disabled</Optimization>
       <AdditionalIncludeDirectories>$(SolutionDir)Misc;$(SolutionDir)OysterMath;$(SolutionDir)OysterPhysics3D;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>_WINDLL;DLL_EXPORT;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
     <Link>
       <GenerateDebugInformation>true</GenerateDebugInformation>
@@ -112,6 +114,7 @@
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <AdditionalIncludeDirectories>$(SolutionDir)Misc;$(SolutionDir)OysterMath;$(SolutionDir)OysterPhysics3D;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>_WINDLL;DLL_EXPORT;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
     <Link>
       <GenerateDebugInformation>true</GenerateDebugInformation>
@@ -126,6 +129,7 @@
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <AdditionalIncludeDirectories>$(SolutionDir)Misc;$(SolutionDir)OysterMath;$(SolutionDir)OysterPhysics3D;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>_WINDLL;DLL_EXPORT;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
     <Link>
       <GenerateDebugInformation>true</GenerateDebugInformation>
@@ -153,6 +157,7 @@
     <ClCompile Include="Implementation\NullBody.cpp" />
     <ClCompile Include="Implementation\PhysicsAPI_Impl.cpp" />
     <ClCompile Include="Implementation\SimpleRigidBody.cpp" />
+    <ClCompile Include="DLLMain.cpp" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">

Code/GamePhysics/GamePhysics.vcxproj.filters

@@ -41,5 +41,8 @@
     <ClCompile Include="Implementation\NullBody.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="DLLMain.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
 </Project>

Code/GamePhysics/PhysicsAPI.h

@@ -4,6 +4,12 @@
 #include "OysterCollision3D.h"
 #include "OysterMath.h"
 
+#if defined DLL_EXPORT
+	#define DLL_USAGE __declspec(dllexport)
+#else
+	#define DLL_USAGE __declspec(dllimport)
+#endif
+
 namespace Oyster
 {
 	namespace Physics
@@ -22,7 +28,7 @@ namespace Oyster
 			const float gravity_constant = (const float)6.67284e-11; //!< The _big_G_! ( N(m/kg)^2 ) Used in real gravityforcefields.
 		}
 
-		class MomentOfInertia
+		class DLL_USAGE MomentOfInertia
 		{
 		public:
 			static ::Oyster::Math::Float4x4 & CreateSphereMatrix( const ::Oyster::Math::Float mass, const ::Oyster::Math::Float radius);
@@ -36,7 +42,7 @@ namespace Oyster
 			static ::Oyster::Math::Float4x4 & CreateRodMatrix( const ::Oyster::Math::Float mass, const ::Oyster::Math::Float length );
 		};
 
-		class API
+		class DLL_USAGE API
 		{
 		public:
 			typedef void (*EventAction_Collision)( unsigned int, unsigned int );
@@ -200,8 +206,8 @@ namespace Oyster
 			virtual ~API() {}
 		};
 	
-		//! sdfsdf
+		//! documentation in progress
-		class ICustomBody
+		class DLL_USAGE ICustomBody
 		{
 		public:
 			virtual ~ICustomBody() {};
@@ -237,7 +243,7 @@ namespace Oyster
 		namespace Error
 		{ //! The content in here is used as API return errorvalues.
 
-			class NullBody : public ICustomBody
+			class DLL_USAGE NullBody : public ICustomBody
 			{
 			public:
 				virtual ~NullBody();