diff --git a/XUSG/Core/XUSG.cpp b/XUSG/Core/XUSG.cpp
index ecff354..8310307 100644
--- a/XUSG/Core/XUSG.cpp
+++ b/XUSG/Core/XUSG.cpp
@@ -396,7 +396,7 @@ uint8_t XUSG::CalculateMipLevels(uint64_t width, uint32_t height, uint32_t depth
 	return CalculateMipLevels(static_cast<uint32_t>(width), height, depth);
 }
 
-uint32_t XUSG::CalculateSubresource(uint8_t mipSlice, uint8_t numMips, uint32_t arraySlice, uint32_t arraySize, uint8_t planeSlice)
+uint32_t XUSG::CalcSubresource(uint8_t mipSlice, uint8_t numMips, uint32_t arraySlice, uint32_t arraySize, uint8_t planeSlice)
 {
 	return mipSlice + arraySlice * numMips + planeSlice * numMips * arraySize;
 }
diff --git a/XUSG/Core/XUSG.h b/XUSG/Core/XUSG.h
index ca04646..39d3f51 100644
--- a/XUSG/Core/XUSG.h
+++ b/XUSG/Core/XUSG.h
@@ -2317,5 +2317,5 @@ namespace XUSG
 	XUSG_INTERFACE uint8_t Log2(uint32_t value);
 	XUSG_INTERFACE uint8_t CalculateMipLevels(uint32_t width, uint32_t height, uint32_t depth = 1);
 	XUSG_INTERFACE uint8_t CalculateMipLevels(uint64_t width, uint32_t height, uint32_t depth = 1);
-	XUSG_INTERFACE uint32_t CalculateSubresource(uint8_t mipSlice, uint8_t numMips, uint32_t arraySlice, uint32_t arraySize, uint8_t planeSlice);
+	XUSG_INTERFACE uint32_t CalcSubresource(uint8_t mipSlice, uint8_t numMips, uint32_t arraySlice, uint32_t arraySize, uint8_t planeSlice);
 }
diff --git a/XUSG/Core/XUSGPipelineLayout_DX12.cpp b/XUSG/Core/XUSGPipelineLayout_DX12.cpp
index 90f4403..854abec 100644
--- a/XUSG/Core/XUSGPipelineLayout_DX12.cpp
+++ b/XUSG/Core/XUSGPipelineLayout_DX12.cpp
@@ -331,7 +331,8 @@ D3D_ROOT_SIGNATURE_VERSION PipelineLayoutLib_DX12::GetRootSignatureHighestVersio
 {
 	D3D12_FEATURE_DATA_ROOT_SIGNATURE featureData = {};
 
-	if (FAILED(m_device->CheckFeatureSupport(D3D12_FEATURE_ROOT_SIGNATURE, &featureData, sizeof(featureData))))
+	if (FAILED(m_device->CheckFeatureSupport(D3D12_FEATURE_ROOT_SIGNATURE,
+		&featureData, sizeof(featureData))) || !featureData.HighestVersion)
 		return D3D_ROOT_SIGNATURE_VERSION_1_0;
 
 	// This is the highest version the sample supports. If CheckFeatureSupport succeeds, the HighestVersion returned will not be greater than this.