"ID3D11Device::CreateInputLayout" Changed?

Question

HRESULT CreateInputLayout(
  [in]   const D3D11_INPUT_ELEMENT_DESC *pInputElementDescs,
  [in]   UINT NumElements,
  [in]   constvoid*pShaderBytecodeWithInputSignature,
  [in]   SIZE_T BytecodeLength,
  [out]  ID3D11InputLayout **ppInputLayout
);

In old SDK, pShaderBytecodeWithInputSignature is a SignedBlob. But in Metro Sample, it uses the Compiled Shader(cso) directly?

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C++ DX11

Answer 1

The .cso file is a binary 'blob' of all the HLSL shader output. The various Direct3D 11 APIs do not care about the way it gets the data which can be from a binary memory blob loaded from a .cso, coming back directly from D3DCompile* as a ID3DBlob, or a static C-style binary array generated by FXC using the /Fh flag (this last technique is what we use for DirectXTK's shaders).

http://go.microsoft.com/fwlink/?LinkId=248929

Answer 2

 Why we use D3DGetInputSignatureBlob in the old SDK, and it is not needed now?

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C++ DX11

Answer 3

I believe that has always been optional...