diff --git a/dlls/d3dcompiler_43/blob.c b/dlls/d3dcompiler_43/blob.c
index b22a3c64365..d6740905ff2 100644
--- a/dlls/d3dcompiler_43/blob.c
+++ b/dlls/d3dcompiler_43/blob.c
@@ -119,10 +119,31 @@ HRESULT d3dcompiler_blob_init(struct d3dcompiler_blob *blob, SIZE_T data_size)
     return S_OK;
 }
 
+static BOOL check_blob_part(DWORD tag, D3D_BLOB_PART part)
+{
+    BOOL add = FALSE;
+
+    switch(part)
+    {
+        case D3D_BLOB_INPUT_SIGNATURE_BLOB:
+            if (tag == TAG_ISGN) add = TRUE;
+            break;
+
+        default:
+            FIXME("Unhandled D3D_BLOB_PART %s.\n", debug_d3dcompiler_d3d_blob_part(part));
+            break;
+    }
+
+    TRACE("%s tag %s\n", add ? "Add" : "Skip", debugstr_an((const char *)&tag, 4));
+
+    return add;
+}
+
 HRESULT d3dcompiler_get_blob_part(const void *data, SIZE_T data_size, D3D_BLOB_PART part, UINT flags, ID3DBlob **blob)
 {
     struct dxbc src_dxbc, dst_dxbc;
     HRESULT hr;
+    unsigned int i, count;
 
     if (!data || !data_size || flags || !blob)
     {
@@ -144,6 +165,52 @@ HRESULT d3dcompiler_get_blob_part(const void *data, SIZE_T data_size, D3D_BLOB_P
         return hr;
     }
 
+    hr = dxbc_init(&dst_dxbc, 0);
+    if (FAILED(hr))
+    {
+        dxbc_destroy(&src_dxbc);
+        WARN("Failed to init dxbc\n");
+        return hr;
+    }
+
+    for (i = 0; i < src_dxbc.count; ++i)
+    {
+        struct dxbc_section *section = &src_dxbc.sections[i];
+
+        if (check_blob_part(section->tag, part))
+        {
+            hr = dxbc_add_section(&dst_dxbc, section->tag, section->data, section->data_size);
+            if (FAILED(hr))
+            {
+                dxbc_destroy(&src_dxbc);
+                dxbc_destroy(&dst_dxbc);
+                WARN("Failed to add section to dxbc\n");
+                return hr;
+            }
+        }
+    }
+
+    count = dst_dxbc.count;
+
+    switch(part)
+    {
+        case D3D_BLOB_INPUT_SIGNATURE_BLOB:
+            if (count != 1) count = 0;
+            break;
+
+        default:
+            FIXME("Unhandled D3D_BLOB_PART %s.\n", debug_d3dcompiler_d3d_blob_part(part));
+            break;
+    }
+
+    if (count == 0)
+    {
+        dxbc_destroy(&src_dxbc);
+        dxbc_destroy(&dst_dxbc);
+        WARN("Nothing to write into the blob (count = 0)\n");
+        return E_FAIL;
+    }
+
     hr = dxbc_write_blob(&dst_dxbc, blob);
     if (FAILED(hr))
     {
diff --git a/dlls/d3dcompiler_43/d3dcompiler_43.spec b/dlls/d3dcompiler_43/d3dcompiler_43.spec
index a54ddfb9e98..41f104981b1 100644
--- a/dlls/d3dcompiler_43/d3dcompiler_43.spec
+++ b/dlls/d3dcompiler_43/d3dcompiler_43.spec
@@ -9,7 +9,7 @@
 @ stdcall D3DGetBlobPart(ptr long long long ptr)
 @ stub D3DGetDebugInfo
 @ stub D3DGetInputAndOutputSignatureBlob
-@ stub D3DGetInputSignatureBlob
+@ stdcall D3DGetInputSignatureBlob(ptr long ptr)
 @ stub D3DGetOutputSignatureBlob
 @ stdcall D3DPreprocess(ptr long str ptr ptr ptr ptr)
 @ stub D3DReflect
diff --git a/dlls/d3dcompiler_43/d3dcompiler_43_main.c b/dlls/d3dcompiler_43/d3dcompiler_43_main.c
index 59438424b5d..88af168a98d 100644
--- a/dlls/d3dcompiler_43/d3dcompiler_43_main.c
+++ b/dlls/d3dcompiler_43/d3dcompiler_43_main.c
@@ -88,3 +88,10 @@ HRESULT WINAPI D3DGetBlobPart(const void *data, SIZE_T data_size, D3D_BLOB_PART
 
     return d3dcompiler_get_blob_part(data, data_size, part, flags, blob);
 }
+
+HRESULT WINAPI D3DGetInputSignatureBlob(const void *data, SIZE_T data_size, ID3DBlob **blob)
+{
+    TRACE("data %p, data_size %lu, blob %p\n", data, data_size, blob);
+
+    return d3dcompiler_get_blob_part(data, data_size, D3D_BLOB_INPUT_SIGNATURE_BLOB, 0, blob);
+}
diff --git a/dlls/d3dcompiler_43/d3dcompiler_private.h b/dlls/d3dcompiler_43/d3dcompiler_private.h
index 5787ab23909..eb7674fe4b3 100644
--- a/dlls/d3dcompiler_43/d3dcompiler_private.h
+++ b/dlls/d3dcompiler_43/d3dcompiler_private.h
@@ -581,6 +581,7 @@ void SlDeleteShader(struct bwriter_shader *shader);
     ((DWORD)(ch0) | ((DWORD)(ch1) << 8) | \
     ((DWORD)(ch2) << 16) | ((DWORD)(ch3) << 24 ))
 #define TAG_DXBC MAKE_TAG('D', 'X', 'B', 'C')
+#define TAG_ISGN MAKE_TAG('I', 'S', 'G', 'N')
 
 struct dxbc_section
 {
diff --git a/include/d3dcompiler.h b/include/d3dcompiler.h
index 6e039b5bc30..0dfe9ff65ab 100644
--- a/include/d3dcompiler.h
+++ b/include/d3dcompiler.h
@@ -62,6 +62,7 @@ typedef enum D3D_BLOB_PART
 } D3D_BLOB_PART;
 
 HRESULT WINAPI D3DGetBlobPart(const void *data, SIZE_T data_size, D3D_BLOB_PART part, UINT flags, ID3DBlob **blob);
+HRESULT WINAPI D3DGetInputSignatureBlob(const void *data, SIZE_T data_size, ID3DBlob **blob);
 
 HRESULT WINAPI D3DCreateBlob(SIZE_T data_size, ID3DBlob **blob);