ddraw: Use ddraw_from_d3d7 to make a (IDirectDrawImpl *) from a (IDirect3D7 *).

dlls/ddraw/device.c

@@ -1790,7 +1790,7 @@ Thunk_IDirect3DDeviceImpl_3_GetDirect3D(IDirect3DDevice3 *iface,
     ret = IDirect3DDevice7_GetDirect3D((IDirect3DDevice7 *)This, &ret_ptr);
     if(ret != D3D_OK)
         return ret;
-    *Direct3D3 = ret_ptr ? (IDirect3D3 *)&((IDirectDrawImpl *)ret_ptr)->IDirect3D3_vtbl : NULL;
+    *Direct3D3 = ret_ptr ? (IDirect3D3 *)&ddraw_from_d3d7(ret_ptr)->IDirect3D3_vtbl : NULL;
     TRACE(" returning interface %p\n", *Direct3D3);
     return D3D_OK;
 }
@@ -1807,7 +1807,7 @@ Thunk_IDirect3DDeviceImpl_2_GetDirect3D(IDirect3DDevice2 *iface,
     ret = IDirect3DDevice7_GetDirect3D((IDirect3DDevice7 *)This, &ret_ptr);
     if(ret != D3D_OK)
         return ret;
-    *Direct3D2 = ret_ptr ? (IDirect3D2 *)&((IDirectDrawImpl *)ret_ptr)->IDirect3D2_vtbl : NULL;
+    *Direct3D2 = ret_ptr ? (IDirect3D2 *)&ddraw_from_d3d7(ret_ptr)->IDirect3D2_vtbl : NULL;
     TRACE(" returning interface %p\n", *Direct3D2);
     return D3D_OK;
 }
@@ -1824,7 +1824,7 @@ Thunk_IDirect3DDeviceImpl_1_GetDirect3D(IDirect3DDevice *iface,
     ret = IDirect3DDevice7_GetDirect3D((IDirect3DDevice7 *)This, &ret_ptr);
     if(ret != D3D_OK)
         return ret;
-    *Direct3D = ret_ptr ? (IDirect3D *)&((IDirectDrawImpl *)ret_ptr)->IDirect3D_vtbl : NULL;
+    *Direct3D = ret_ptr ? (IDirect3D *)&ddraw_from_d3d7(ret_ptr)->IDirect3D_vtbl : NULL;
     TRACE(" returning interface %p\n", *Direct3D);
     return D3D_OK;
 }

dlls/ddraw/tests/d3d.c

@@ -1033,6 +1033,7 @@ static void Direct3D1Test(void)
     D3DVIEWPORT vp_data;
     D3DINSTRUCTION *instr;
     D3DBRANCH *branch;
+    IDirect3D *Direct3D_alt;
     unsigned int idx = 0;
     static struct v_in testverts[] = {
         {0.0, 0.0, 0.0},  { 1.0,  1.0,  1.0}, {-1.0, -1.0, -1.0},
@@ -1050,6 +1051,12 @@ static void Direct3D1Test(void)
     D3DTRANSFORMDATA transformdata;
     DWORD i = FALSE;
 
+    /* Interface consistency check. */
+    hr = IDirect3DDevice_GetDirect3D(Direct3DDevice1, &Direct3D_alt);
+    ok(hr == D3D_OK, "IDirect3DDevice_GetDirect3D failed: %08x\n", hr);
+    if (hr == D3D_OK)
+        ok(Direct3D_alt == Direct3D1, "Direct3D1 struct pointer missmatch: %p != %p\n", Direct3D_alt, Direct3D1);
+
     memset(&desc, 0, sizeof(desc));
     desc.dwSize = sizeof(desc);
     hr = IDirect3DExecuteBuffer_Lock(ExecuteBuffer, &desc);