Check for vulkan before installing dxvk as best alternative

wine-dxvk.spec

@@ -10,7 +10,7 @@
 
 Name:           wine-dxvk
 Version:        1.7
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        Vulkan-based D3D11 and D3D10 implementation for Linux / Wine
 
 License:        zlib
@@ -41,6 +41,7 @@ BuildRequires:  mingw32-gcc-c++
 BuildRequires:  mingw32-winpthreads-static
 %endif
 
+Requires(pre):  vulkan-tools
 Requires:       wine >= 4.13
 Recommends:     wine-dxvk-dxgi%{?_isa} = %{version}-%{release}
 Requires:       vulkan-loader%{?_isa}
@@ -120,13 +121,24 @@ mv %{buildroot}%{_libdir}/wine/d3d10_1.dll %{buildroot}%{_libdir}/wine/dxvk-d3d1
 mv %{buildroot}%{_libdir}/wine/d3d11.dll %{buildroot}%{_libdir}/wine/dxvk-d3d11.dll
 
 %posttrans
-%{_sbindir}/alternatives --install %{_libdir}/wine/d3d10.dll 'wine-d3d10%{?_isa}' %{_libdir}/wine/dxvk-d3d10.dll 20 \
---slave %{_libdir}/wine/d3d10_1.dll 'wine-d3d10_1%{?_isa}' %{_libdir}/wine/dxvk-d3d10_1.dll \
---slave %{_libdir}/wine/d3d10core.dll 'wine-d3d10core%{?_isa}' %{_libdir}/wine/dxvk-d3d10core.dll
-%{_sbindir}/alternatives --install %{_libdir}/wine/d3d11.dll 'wine-d3d11%{?_isa}' %{_libdir}/wine/dxvk-d3d11.dll 20
+if vulkaninfo &> /dev/null; then
+    %{_sbindir}/alternatives --install %{_libdir}/wine/d3d10.dll 'wine-d3d10%{?_isa}' %{_libdir}/wine/dxvk-d3d10.dll 20 \
+    --slave %{_libdir}/wine/d3d10_1.dll 'wine-d3d10_1%{?_isa}' %{_libdir}/wine/dxvk-d3d10_1.dll \
+    --slave %{_libdir}/wine/d3d10core.dll 'wine-d3d10core%{?_isa}' %{_libdir}/wine/dxvk-d3d10core.dll
+    %{_sbindir}/alternatives --install %{_libdir}/wine/d3d11.dll 'wine-d3d11%{?_isa}' %{_libdir}/wine/dxvk-d3d11.dll 20
+else
+    %{_sbindir}/alternatives --install %{_libdir}/wine/d3d10.dll 'wine-d3d10%{?_isa}' %{_libdir}/wine/dxvk-d3d10.dll 5 \
+    --slave %{_libdir}/wine/d3d10_1.dll 'wine-d3d10_1%{?_isa}' %{_libdir}/wine/dxvk-d3d10_1.dll \
+    --slave %{_libdir}/wine/d3d10core.dll 'wine-d3d10core%{?_isa}' %{_libdir}/wine/dxvk-d3d10core.dll
+    %{_sbindir}/alternatives --install %{_libdir}/wine/d3d11.dll 'wine-d3d11%{?_isa}' %{_libdir}/wine/dxvk-d3d11.dll 5
+fi
 
 %posttrans d3d9
-%{_sbindir}/alternatives --install %{_libdir}/wine/d3d9.dll 'wine-d3d9%{?_isa}' %{_libdir}/wine/dxvk-d3d9.dll 20
+if vulkaninfo &> /dev/null; then
+    %{_sbindir}/alternatives --install %{_libdir}/wine/d3d9.dll 'wine-d3d9%{?_isa}' %{_libdir}/wine/dxvk-d3d9.dll 20
+else
+    %{_sbindir}/alternatives --install %{_libdir}/wine/d3d9.dll 'wine-d3d9%{?_isa}' %{_libdir}/wine/dxvk-d3d9.dll 5
+fi
 
 %postun
 %{_sbindir}/alternatives --remove 'wine-d3d10%{?_isa}' %{_libdir}/wine/dxvk-d3d10.dll