[dxvk] Add config option to enable the HUD

dxvk.conf

@@ -210,4 +210,13 @@
 # - Auto: Don't change the default
 # - True, False: Always enable / disable
 
-# dxvk.useEarlyDiscard = Auto
+# dxvk.useEarlyDiscard = Auto
+
+
+# Sets enabled HUD elements
+# 
+# Behaves like the DXVK_HUD environment variable if the
+# environment variable is not set, otherwise it will be
+# ignored. The syntax is identical.
+
+# dxvk.hud = 

src/dxvk/dxvk_options.cpp

@@ -8,6 +8,7 @@ namespace dxvk {
     numCompilerThreads    = config.getOption<int32_t> ("dxvk.numCompilerThreads",     0);
     useRawSsbo            = config.getOption<Tristate>("dxvk.useRawSsbo",             Tristate::Auto);
     useEarlyDiscard       = config.getOption<Tristate>("dxvk.useEarlyDiscard",        Tristate::Auto);
+    hud                   = config.getOption<std::string>("dxvk.hud", "");
   }
 
 }

src/dxvk/dxvk_options.h

@@ -21,6 +21,9 @@ namespace dxvk {
     /// Shader-related options
     Tristate useRawSsbo;
     Tristate useEarlyDiscard;
+
+    /// HUD elements
+    std::string hud;
   };
 
 }

src/dxvk/hud/dxvk_hud.cpp

@@ -59,8 +59,13 @@ namespace dxvk::hud {
   
   
   Rc<Hud> Hud::createHud(const Rc<DxvkDevice>& device) {
-    HudConfig config(env::getEnvVar("DXVK_HUD"));
+    std::string hudElements = env::getEnvVar("DXVK_HUD");
-    
+
+    if (hudElements.empty())
+      hudElements = device->config().hud;
+
+    HudConfig config(hudElements);
+
     return !config.elements.isClear()
       ? new Hud(device, config)
       : nullptr;