A wrapper for root signature creation.

root_signature_helper.cpp

ComPtr<ID3D12RootSignature> afCreateRootSignature(int numDescriptors, D3D12_DESCRIPTOR_RANGE descriptors[], int numSamplers, D3D12_STATIC_SAMPLER_DESC samplers[])
{
	ComPtr<ID3D12RootSignature> rs;
	ComPtr<ID3DBlob> signature;
	ComPtr<ID3DBlob> error;

	D3D12_ROOT_PARAMETER rootParameter = {};
	rootParameter.ParameterType = D3D12_ROOT_PARAMETER_TYPE_DESCRIPTOR_TABLE;
	rootParameter.ShaderVisibility = D3D12_SHADER_VISIBILITY_ALL;
	rootParameter.DescriptorTable.NumDescriptorRanges = numDescriptors;
	rootParameter.DescriptorTable.pDescriptorRanges = descriptors;

	D3D12_ROOT_SIGNATURE_DESC rsDesc = { (UINT)(numDescriptors ? 1 : 0), &rootParameter, (UINT)numSamplers, samplers, D3D12_ROOT_SIGNATURE_FLAG_ALLOW_INPUT_ASSEMBLER_INPUT_LAYOUT };
	HRESULT hr = D3D12SerializeRootSignature(&rsDesc, D3D_ROOT_SIGNATURE_VERSION_1, &signature, &error);
	assert(hr == S_OK);
	hr = deviceMan.GetDevice()->CreateRootSignature(0, signature->GetBufferPointer(), signature->GetBufferSize(), IID_PPV_ARGS(&rs));
	assert(hr == S_OK);
	return rs;
}