[Windows] Make D3D12 loading dynamic to support pre Windows 10 versions.

2 files changed, 107 insertions, 5 deletions

diff --git a/thirdparty/directx_headers/include/directx/d3dx12_root_signature.h b/thirdparty/directx_headers/include/directx/d3dx12_root_signature.h
index 572efed852..a83d9d017c 100644
--- a/thirdparty/directx_headers/include/directx/d3dx12_root_signature.h
+++ b/thirdparty/directx_headers/include/directx/d3dx12_root_signature.h
@@ -996,6 +996,9 @@ struct CD3DX12_GPU_DESCRIPTOR_HANDLE : public D3D12_GPU_DESCRIPTOR_HANDLE
 // two code paths for building root signatures, this helper method reconstructs a 1.0 signature when
 // 1.1 is not supported.
 inline HRESULT D3DX12SerializeVersionedRootSignature(
+/* GODOT start */
+    _In_ HMODULE pLibD3D12,
+/* GODOT end */
     _In_ const D3D12_VERSIONED_ROOT_SIGNATURE_DESC* pRootSignatureDesc,
     D3D_ROOT_SIGNATURE_VERSION MaxVersion,
     _Outptr_ ID3DBlob** ppBlob,
@@ -1006,13 +1009,22 @@ inline HRESULT D3DX12SerializeVersionedRootSignature(
         *ppErrorBlob = nullptr;
     }
 
+    /* GODOT start */
+	PFN_D3D12_SERIALIZE_ROOT_SIGNATURE d3d_D3D12SerializeRootSignature = (PFN_D3D12_SERIALIZE_ROOT_SIGNATURE)(void *)GetProcAddress(pLibD3D12, "D3D12SerializeRootSignature");
+    if (d3d_D3D12SerializeRootSignature == nullptr) {
+        return E_INVALIDARG;
+    }
+    PFN_D3D12_SERIALIZE_VERSIONED_ROOT_SIGNATURE d3d_D3D12SerializeVersionedRootSignature = (PFN_D3D12_SERIALIZE_VERSIONED_ROOT_SIGNATURE)(void *)GetProcAddress(pLibD3D12, "D3D12SerializeVersionedRootSignature");
+    /* GODOT end */
     switch (MaxVersion)
     {
         case D3D_ROOT_SIGNATURE_VERSION_1_0:
             switch (pRootSignatureDesc->Version)
             {
                 case D3D_ROOT_SIGNATURE_VERSION_1_0:
-                    return D3D12SerializeRootSignature(&pRootSignatureDesc->Desc_1_0, D3D_ROOT_SIGNATURE_VERSION_1, ppBlob, ppErrorBlob);
+/* GODOT start */
+                    return d3d_D3D12SerializeRootSignature(&pRootSignatureDesc->Desc_1_0, D3D_ROOT_SIGNATURE_VERSION_1, ppBlob, ppErrorBlob);
+/* GODOT end */
 
                 case D3D_ROOT_SIGNATURE_VERSION_1_1:
 #if defined(D3D12_SDK_VERSION) && (D3D12_SDK_VERSION >= 609)
@@ -1114,7 +1126,9 @@ inline HRESULT D3DX12SerializeVersionedRootSignature(
                     if (SUCCEEDED(hr))
                     {
                         const CD3DX12_ROOT_SIGNATURE_DESC desc_1_0(desc_1_1.NumParameters, pParameters_1_0, desc_1_1.NumStaticSamplers, pStaticSamplers == nullptr ? desc_1_1.pStaticSamplers : pStaticSamplers, desc_1_1.Flags);
-                        hr = D3D12SerializeRootSignature(&desc_1_0, D3D_ROOT_SIGNATURE_VERSION_1, ppBlob, ppErrorBlob);
+/* GODOT start */
+                        hr = d3d_D3D12SerializeRootSignature(&desc_1_0, D3D_ROOT_SIGNATURE_VERSION_1, ppBlob, ppErrorBlob);
+/* GODOT end */
                     }
 
                     if (pParameters)
@@ -1145,7 +1159,9 @@ inline HRESULT D3DX12SerializeVersionedRootSignature(
             {
             case D3D_ROOT_SIGNATURE_VERSION_1_0:
             case D3D_ROOT_SIGNATURE_VERSION_1_1:
-                return D3D12SerializeVersionedRootSignature(pRootSignatureDesc, ppBlob, ppErrorBlob);
+/* GODOT start */
+                return d3d_D3D12SerializeVersionedRootSignature(pRootSignatureDesc, ppBlob, ppErrorBlob);
+/* GODOT end */
 
 #if defined(D3D12_SDK_VERSION) && (D3D12_SDK_VERSION >= 609)
             case D3D_ROOT_SIGNATURE_VERSION_1_2:
@@ -1181,7 +1197,9 @@ inline HRESULT D3DX12SerializeVersionedRootSignature(
                 if (SUCCEEDED(hr))
                 {
                     const CD3DX12_VERSIONED_ROOT_SIGNATURE_DESC desc(desc_1_1.NumParameters, desc_1_1.pParameters, desc_1_1.NumStaticSamplers, pStaticSamplers == nullptr ? desc_1_1.pStaticSamplers : pStaticSamplers, desc_1_1.Flags);
-                    hr = D3D12SerializeVersionedRootSignature(&desc, ppBlob, ppErrorBlob);
+/* GODOT start */
+                    hr = d3d_D3D12SerializeVersionedRootSignature(&desc, ppBlob, ppErrorBlob);
+/* GODOT end */
                 }
 
                 if (pStaticSamplers)
@@ -1197,7 +1215,9 @@ inline HRESULT D3DX12SerializeVersionedRootSignature(
 #if defined(D3D12_SDK_VERSION) && (D3D12_SDK_VERSION >= 609)
         case D3D_ROOT_SIGNATURE_VERSION_1_2:
 #endif
-            return D3D12SerializeVersionedRootSignature(pRootSignatureDesc, ppBlob, ppErrorBlob);
+/* GODOT start */
+            return d3d_D3D12SerializeVersionedRootSignature(pRootSignatureDesc, ppBlob, ppErrorBlob);
+/* GODOT end */
     }
 
     return E_INVALIDARG;
diff --git a/thirdparty/directx_headers/patches/patch_d3d12_dynamic_load.diff b/thirdparty/directx_headers/patches/patch_d3d12_dynamic_load.diff
new file mode 100644
index 0000000000..d520a44172
--- /dev/null
+++ b/thirdparty/directx_headers/patches/patch_d3d12_dynamic_load.diff
@@ -0,0 +1,82 @@
+diff --git a/thirdparty/directx_headers/include/directx/d3dx12_root_signature.h b/thirdparty/directx_headers/include/directx/d3dx12_root_signature.h
+index 572efed852..18efa7a0cb 100644
+--- a/thirdparty/directx_headers/include/directx/d3dx12_root_signature.h
++++ b/thirdparty/directx_headers/include/directx/d3dx12_root_signature.h
+@@ -996,6 +996,9 @@ struct CD3DX12_GPU_DESCRIPTOR_HANDLE : public D3D12_GPU_DESCRIPTOR_HANDLE
+ // two code paths for building root signatures, this helper method reconstructs a 1.0 signature when
+ // 1.1 is not supported.
+ inline HRESULT D3DX12SerializeVersionedRootSignature(
++/* GODOT start */
++    _In_ HMODULE pLibD3D12,
++/* GODOT end */
+     _In_ const D3D12_VERSIONED_ROOT_SIGNATURE_DESC* pRootSignatureDesc,
+     D3D_ROOT_SIGNATURE_VERSION MaxVersion,
+     _Outptr_ ID3DBlob** ppBlob,
+@@ -1006,13 +1009,22 @@ inline HRESULT D3DX12SerializeVersionedRootSignature(
+         *ppErrorBlob = nullptr;
+     }
+ 
++    /* GODOT start */
++	PFN_D3D12_SERIALIZE_ROOT_SIGNATURE d3d_D3D12SerializeRootSignature = (PFN_D3D12_SERIALIZE_ROOT_SIGNATURE)(void *)GetProcAddress(pLibD3D12, "D3D12SerializeRootSignature");
++    if (d3d_D3D12SerializeRootSignature == nullptr) {
++        return E_INVALIDARG;
++    }
++    PFN_D3D12_SERIALIZE_VERSIONED_ROOT_SIGNATURE d3d_D3D12SerializeVersionedRootSignature = (PFN_D3D12_SERIALIZE_VERSIONED_ROOT_SIGNATURE)(void *)GetProcAddress(pLibD3D12, "D3D12SerializeVersionedRootSignature");
++    /* GODOT end */
+     switch (MaxVersion)
+     {
+         case D3D_ROOT_SIGNATURE_VERSION_1_0:
+             switch (pRootSignatureDesc->Version)
+             {
+                 case D3D_ROOT_SIGNATURE_VERSION_1_0:
+-                    return D3D12SerializeRootSignature(&pRootSignatureDesc->Desc_1_0, D3D_ROOT_SIGNATURE_VERSION_1, ppBlob, ppErrorBlob);
++/* GODOT start */
++                    return d3d_D3D12SerializeRootSignature(&pRootSignatureDesc->Desc_1_0, D3D_ROOT_SIGNATURE_VERSION_1, ppBlob, ppErrorBlob);
++/* GODOT end */
+ 
+                 case D3D_ROOT_SIGNATURE_VERSION_1_1:
+ #if defined(D3D12_SDK_VERSION) && (D3D12_SDK_VERSION >= 609)
+@@ -1114,7 +1126,9 @@ inline HRESULT D3DX12SerializeVersionedRootSignature(
+                     if (SUCCEEDED(hr))
+                     {
+                         const CD3DX12_ROOT_SIGNATURE_DESC desc_1_0(desc_1_1.NumParameters, pParameters_1_0, desc_1_1.NumStaticSamplers, pStaticSamplers == nullptr ? desc_1_1.pStaticSamplers : pStaticSamplers, desc_1_1.Flags);
+-                        hr = D3D12SerializeRootSignature(&desc_1_0, D3D_ROOT_SIGNATURE_VERSION_1, ppBlob, ppErrorBlob);
++/* GODOT start */
++                        hr = d3d_D3D12SerializeRootSignature(&desc_1_0, D3D_ROOT_SIGNATURE_VERSION_1, ppBlob, ppErrorBlob);
++/* GODOT end */
+                     }
+ 
+                     if (pParameters)
+@@ -1145,7 +1159,9 @@ inline HRESULT D3DX12SerializeVersionedRootSignature(
+             {
+             case D3D_ROOT_SIGNATURE_VERSION_1_0:
+             case D3D_ROOT_SIGNATURE_VERSION_1_1:
+-                return D3D12SerializeVersionedRootSignature(pRootSignatureDesc, ppBlob, ppErrorBlob);
++/* GODOT start */
++                return d3d_D3D12SerializeVersionedRootSignature(pRootSignatureDesc, ppBlob, ppErrorBlob);
++/* GODOT end */
+ 
+ #if defined(D3D12_SDK_VERSION) && (D3D12_SDK_VERSION >= 609)
+             case D3D_ROOT_SIGNATURE_VERSION_1_2:
+@@ -1181,7 +1197,9 @@ inline HRESULT D3DX12SerializeVersionedRootSignature(
+                 if (SUCCEEDED(hr))
+                 {
+                     const CD3DX12_VERSIONED_ROOT_SIGNATURE_DESC desc(desc_1_1.NumParameters, desc_1_1.pParameters, desc_1_1.NumStaticSamplers, pStaticSamplers == nullptr ? desc_1_1.pStaticSamplers : pStaticSamplers, desc_1_1.Flags);
+-                    hr = D3D12SerializeVersionedRootSignature(&desc, ppBlob, ppErrorBlob);
++/* GODOT start */
++                    hr = d3d_D3D12SerializeVersionedRootSignature(&desc, ppBlob, ppErrorBlob);
++/* GODOT end */
+                 }
+ 
+                 if (pStaticSamplers)
+@@ -1197,7 +1215,9 @@ inline HRESULT D3DX12SerializeVersionedRootSignature(
+ #if defined(D3D12_SDK_VERSION) && (D3D12_SDK_VERSION >= 609)
+         case D3D_ROOT_SIGNATURE_VERSION_1_2:
+ #endif
+-            return D3D12SerializeVersionedRootSignature(pRootSignatureDesc, ppBlob, ppErrorBlob);
++/* GODOT start */
++            return d3d_D3D12SerializeVersionedRootSignature(pRootSignatureDesc, ppBlob, ppErrorBlob);
++/* GODOT end */
+     }
+ 
+     return E_INVALIDARG;