[dxgi] Make faking Dx10 support a per-app option

Also whitelist World of Warcraft, which requires this hack for now.

src/dxgi/dxgi_adapter.cpp

@@ -8,6 +8,7 @@
 #include "dxgi_enums.h"
 #include "dxgi_factory.h"
 #include "dxgi_format.h"
+#include "dxgi_options.h"
 #include "dxgi_output.h"
 
 #include "../dxvk/vulkan/dxvk_vulkan_names.h"
@@ -63,8 +64,9 @@ namespace dxvk {
      || InterfaceName == __uuidof(ID3D10Device1)) {
       Logger::warn("DXGI: CheckInterfaceSupport: No D3D10 support");
       
-      if (env::getEnvVar(L"DXVK_FAKE_DX10_SUPPORT") == "1")
-        return S_OK;
+      DxgiOptions dxgiOptions = getDxgiAppOptions(env::getExeName());
+      return dxgiOptions.test(DxgiOption::FakeDx10Support)
+        ? S_OK : DXGI_ERROR_UNSUPPORTED;
     }
     
     Logger::err("DXGI: CheckInterfaceSupport: Unsupported interface");

src/dxgi/dxgi_include.h

@@ -17,6 +17,7 @@
 #include "../util/rc/util_rc.h"
 #include "../util/rc/util_rc_ptr.h"
 
+#include "../util/util_env.h"
 #include "../util/util_enum.h"
 #include "../util/util_error.h"
 #include "../util/util_flags.h"

src/dxgi/dxgi_options.cpp

@@ -6,15 +6,21 @@ namespace dxvk {
   
   const static std::unordered_map<std::string, DxgiOptions> g_dxgiAppOptions = {{
     { "Frostpunk.exe", DxgiOptions(DxgiOption::DeferSurfaceCreation) },
+    { "Wow.exe",       DxgiOptions(DxgiOption::FakeDx10Support)      },
   }};
   
   
   DxgiOptions getDxgiAppOptions(const std::string& appName) {
+    DxgiOptions options;
+
     auto appOptions = g_dxgiAppOptions.find(appName);
+    if (appOptions != g_dxgiAppOptions.end())
+      options = appOptions->second;
     
-    return appOptions != g_dxgiAppOptions.end()
-      ? appOptions->second
-      : DxgiOptions();
+    if (env::getEnvVar(L"DXVK_FAKE_DX10_SUPPORT") == "1")
+      options.set(DxgiOption::FakeDx10Support);
+    
+    return options;
   }
   
 }

src/dxgi/dxgi_options.h

@@ -15,6 +15,11 @@ namespace dxvk {
     /// fixes issues with games that create multiple swap chains
     /// for a single window that may interfere with each other.
     DeferSurfaceCreation,
+
+    /// Report to the app that Dx10 interfaces are supported,
+    /// even if they are not actually supported. Some apps
+    /// refuse to start without it, some don't work with it.
+    FakeDx10Support,
   };
   
   using DxgiOptions = Flags<DxgiOption>;