add root signature flags support.

Author: LinkClinton

descriptors/root_signature.cpp

@@ -135,18 +135,18 @@ wrapper::directx12::root_signature::root_signature(const ComPtr<ID3D12RootSignat
 {
 }
 
-wrapper::directx12::root_signature wrapper::directx12::root_signature::create(const device& device, const root_signature_info& info, bool local)
+wrapper::directx12::root_signature wrapper::directx12::root_signature::create(
+	const D3D12_ROOT_SIGNATURE_FLAGS& flags,
+	const device& device, const root_signature_info& info)
 {
 	D3D12_ROOT_SIGNATURE_DESC desc;
 
-	// https://docs.microsoft.com/en-us/windows/win32/api/d3d12/ne-d3d12-d3d12_root_signature_flags
-	// This flag(D3D12_ROOT_SIGNATURE_FLAG_LOCAL_ROOT_SIGNATURE) cannot be combined with any other root signature flags
-	desc.Flags = local ? D3D12_ROOT_SIGNATURE_FLAG_LOCAL_ROOT_SIGNATURE : D3D12_ROOT_SIGNATURE_FLAG_ALLOW_INPUT_ASSEMBLER_INPUT_LAYOUT;
+	desc.Flags = flags;
 	desc.NumStaticSamplers = static_cast<UINT>(info.samplers().size());
 	desc.NumParameters = static_cast<UINT>(info.parameters().size());
 	desc.pStaticSamplers = info.samplers().data();
 	desc.pParameters = info.parameters().data();
-
+	
 	ComPtr<ID3DBlob> signature_blob = nullptr;
 	ComPtr<ID3DBlob> error_blob = nullptr;
 

descriptors/root_signature.hpp

@@ -41,7 +41,9 @@ namespace wrapper::directx12
 		const std::vector<D3D12_ROOT_PARAMETER>& parameters() const;
 	private:
 		root_signature_info& add_root_parameter(const std::string& name, const D3D12_ROOT_PARAMETER& parameter);
-		
+
+		D3D12_ROOT_SIGNATURE_FLAGS mFlags = D3D12_ROOT_SIGNATURE_FLAG_NONE;
+
 		std::vector<D3D12_STATIC_SAMPLER_DESC> mStaticSamplers;
 		std::vector<D3D12_ROOT_PARAMETER> mRootParameters;
 
@@ -61,7 +63,9 @@ namespace wrapper::directx12
 
 		root_signature(const ComPtr<ID3D12RootSignature>& source);
 
-		static root_signature create(const device& device, const root_signature_info& info, bool local = false);
+		static root_signature create(
+			const D3D12_ROOT_SIGNATURE_FLAGS& flags, 
+			const device& device, const root_signature_info& info);
 	};
 
 }

extensions/imgui.hpp

@@ -322,7 +322,9 @@ namespace wrapper::directx12::extensions
 			.add_constants("view", 0, 0, 16)
 			.add_static_sampler("sampler", 0, 0);
 
-		RootSignature = root_signature::create(Device, RootSignatureInfo);
+		RootSignature = root_signature::create(
+			D3D12_ROOT_SIGNATURE_FLAG_ALLOW_INPUT_ASSEMBLER_INPUT_LAYOUT, 
+			Device, RootSignatureInfo);
 
 		static const char* vert_shader =
 			"cbuffer vertexBuffer : register(b0) \