D3D11: Sampler - fix mipFilter=FO_NONE translation

Author: paroj

RenderSystems/Direct3D11/src/OgreD3D11TextureManager.cpp

@@ -44,9 +44,9 @@ namespace Ogre
 
         desc.Filter = D3D11Mappings::get(mMinFilter, mMagFilter, mMipFilter, mCompareEnabled);
         desc.MaxAnisotropy = mMaxAniso;
-        desc.MipLODBias = static_cast<float>(Math::Clamp(mMipmapBias - 0.5, -16.00, 15.99));
-        desc.MinLOD = -D3D11_FLOAT32_MAX;
-        desc.MaxLOD = D3D11_FLOAT32_MAX;
+        desc.MipLODBias = mMipmapBias;
+        desc.MinLOD = 0;
+        desc.MaxLOD = mMipFilter == FO_NONE ? 0 : D3D11_FLOAT32_MAX;
 
         bool reversedZ = Root::getSingleton().getRenderSystem()->isReverseDepthBufferEnabled();
         auto cmpFunc = mCompareFunc;