USD Viewer: added option to disable render state cache. Enable async shaders when cache is disabled

Author: TheMostDiligent

Samples/USDViewer/src/USDViewer.cpp

@@ -132,6 +132,7 @@ SampleBase::CommandLineStatus USDViewer::ProcessCommandLine(int argc, const char
     ArgsParser.Parse("vertex_pool", m_UseVertexPool);
     ArgsParser.Parse("index_pool", m_UseIndexPool);
     ArgsParser.Parse("atlas_dim", m_TextureAtlasDim);
+    ArgsParser.Parse("shader_cache", m_EnableShaderCache);
     LOG_INFO_MESSAGE("USD Viewer Arguments:",
                      "\n    USD Path:        ", m_UsdFileName,
                      "\n    Use vertex pool: ", m_UseVertexPool ? "Yes" : "No",
@@ -154,8 +155,9 @@ void USDViewer::Initialize(const SampleInitInfo& InitInfo)
 {
     SampleBase::Initialize(InitInfo);
 
-    // Create render state cache
+    if (m_EnableShaderCache)
     {
+        // Create render state cache
         RenderStateCacheCreateInfo StateCacheCI;
         StateCacheCI.LogLevel = RENDER_STATE_CACHE_LOG_LEVEL_NORMAL;
 
@@ -189,6 +191,10 @@ void USDViewer::Initialize(const SampleInitInfo& InitInfo)
         const bool        SaveOnExit = true;
         m_DeviceWithCache.LoadCacheFromFile(CachePath.c_str(), SaveOnExit);
     }
+    else
+    {
+        m_DeviceWithCache = RenderDeviceWithCache<false>{m_pDevice};
+    }
 
     ImGuizmo::SetGizmoSizeClipSpace(0.15f);
 
@@ -298,7 +304,8 @@ void USDViewer::LoadStage()
     DelegateCI.UseIndexPool      = m_UseIndexPool;
     DelegateCI.EnableShadows     = true;
 
-    DelegateCI.AllowHotShaderReload = m_EnableHotShaderReload;
+    DelegateCI.AllowHotShaderReload   = m_EnableHotShaderReload;
+    DelegateCI.AsyncShaderCompilation = !m_EnableShaderCache;
 
     if (m_DeviceWithCache.GetDeviceInfo().Features.BindlessResources)
     {

Samples/USDViewer/src/USDViewer.hpp

@@ -84,6 +84,7 @@ class USDViewer final : public SampleBase
 private:
     RenderDeviceWithCache_N m_DeviceWithCache;
 
+    bool m_EnableShaderCache     = false;
     bool m_EnableHotShaderReload = false;
 
     struct StageInfo