[dxvk] Make use of the asynchronous pipeline compiler optional

Users can enable this by setting DXVK_USE_PIPECOMPILER=1.

README.md

@@ -82,6 +82,7 @@ The following environment variables can be used for **debugging** purposes.
 - `DXVK_CUSTOM_DEVICE_ID=<ID>` Specifies a custom PCI device ID
 - `DXVK_LOG_LEVEL=none|error|warn|info|debug` Controls message logging
 - `DXVK_FAKE_DX10_SUPPORT=1` Advertizes support for D3D10 interfaces
+- `DXVK_USE_PIPECOMPILER=1` Enable asynchronous pipeline compilation. This currently only has an effect on RADV in mesa-git.
 
 ## Troubleshooting
 DXVK requires threading support from your mingw-w64 build environment. If you

src/dxvk/dxvk_graphics.cpp

@@ -120,7 +120,8 @@ namespace dxvk {
     // vector, create a new one and add it to the list.
     VkPipeline newPipelineBase   = m_basePipelineBase.load();
     VkPipeline newPipelineHandle = this->compilePipeline(state, renderPassHandle,
-      VK_PIPELINE_CREATE_DISABLE_OPTIMIZATION_BIT, newPipelineBase);
+      m_compiler != nullptr ? VK_PIPELINE_CREATE_DISABLE_OPTIMIZATION_BIT : 0,
+      newPipelineBase);
     
     Rc<DxvkGraphicsPipelineInstance> newPipeline =
       new DxvkGraphicsPipelineInstance(m_device->vkd(), state,
@@ -147,7 +148,9 @@ namespace dxvk {
       m_basePipelineBase.compare_exchange_strong(newPipelineBase, newPipelineHandle);
     
     // Compile optimized pipeline asynchronously
-    m_compiler->queueCompilation(this, newPipeline);
+    if (m_compiler != nullptr)
+      m_compiler->queueCompilation(this, newPipeline);
+    
     return newPipelineHandle;
   }
   

src/dxvk/dxvk_pipemanager.cpp

@@ -41,8 +41,10 @@ namespace dxvk {
   DxvkPipelineManager::DxvkPipelineManager(const DxvkDevice* device)
   : m_device  (device),
     m_cache   (new DxvkPipelineCache(device->vkd())),
-    m_compiler(new DxvkPipelineCompiler()) {
-    
+    m_compiler(nullptr) {
+    // Async shader compilation is opt-in for now
+    if (env::getEnvVar(L"DXVK_USE_PIPECOMPILER") == "1")
+      m_compiler = new DxvkPipelineCompiler();
   }
   
   

src/dxvk/dxvk_pipemanager.h

@@ -97,9 +97,9 @@ namespace dxvk {
     
   private:
     
-    const DxvkDevice*               m_device;
-    const Rc<DxvkPipelineCache>     m_cache;
-    const Rc<DxvkPipelineCompiler>  m_compiler;
+    const DxvkDevice*         m_device;
+    Rc<DxvkPipelineCache>     m_cache;
+    Rc<DxvkPipelineCompiler>  m_compiler;
     
     std::mutex m_mutex;