[dxvk] Add option to enable or disable the transfer queue

dxvk.conf

@@ -150,6 +150,17 @@
 # d3d11.zeroWorkgroupMemory = False
 
 
+# Enables the dedicated transfer queue if available
+#
+# If enabled, resource uploads will be performed on the
+# transfer queue rather than the graphics queue. This
+# may improve texture streaming performance.
+#
+# Supported values: True, False
+
+# dxvk.enableTransferQueue = True
+
+
 # Sets number of pipeline compiler threads.
 # 
 # Supported values:

src/dxvk/dxvk_adapter.cpp

@@ -98,7 +98,8 @@ namespace dxvk {
       VK_QUEUE_GRAPHICS_BIT | VK_QUEUE_COMPUTE_BIT | VK_QUEUE_TRANSFER_BIT,
       VK_QUEUE_TRANSFER_BIT);
     
-    if (transferQueue == VK_QUEUE_FAMILY_IGNORED)
+    if (transferQueue == VK_QUEUE_FAMILY_IGNORED
+     || !m_instance->options().enableTransferQueue)
       transferQueue = graphicsQueue;
     
     DxvkAdapterQueueIndices queues;

src/dxvk/dxvk_options.cpp

@@ -4,6 +4,7 @@ namespace dxvk {
 
   DxvkOptions::DxvkOptions(const Config& config) {
     enableStateCache      = config.getOption<bool>    ("dxvk.enableStateCache",       true);
+    enableTransferQueue   = config.getOption<bool>    ("dxvk.enableTransferQueue",    true);
     numCompilerThreads    = config.getOption<int32_t> ("dxvk.numCompilerThreads",     0);
     useRawSsbo            = config.getOption<Tristate>("dxvk.useRawSsbo",             Tristate::Auto);
     useEarlyDiscard       = config.getOption<Tristate>("dxvk.useEarlyDiscard",        Tristate::Auto);

src/dxvk/dxvk_options.h

@@ -11,6 +11,9 @@ namespace dxvk {
     /// Enable state cache
     bool enableStateCache;
 
+    /// Use transfer queue if available
+    bool enableTransferQueue;
+
     /// Number of compiler threads
     /// when using the state cache
     int32_t numCompilerThreads;