VertexLoaderManager: Clean up and slightly speed up with templates

Source/Core/VideoCommon/OpcodeDecoding.cpp

@@ -122,7 +122,7 @@ public:
     // HACK
     DataReader src{const_cast<u8*>(vertex_data), const_cast<u8*>(vertex_data) + size};
     const u32 bytes =
-        VertexLoaderManager::RunVertices(vat, primitive, num_vertices, src, is_preprocess);
+        VertexLoaderManager::RunVertices<is_preprocess>(vat, primitive, num_vertices, src);
 
     ASSERT(bytes == size);
 

Source/Core/VideoCommon/VertexLoaderManager.cpp

@@ -54,7 +54,6 @@ Common::EnumMap<u8*, CPArray::TexCoord7> cached_arraybases;
 BitSet8 g_main_vat_dirty;
 BitSet8 g_preprocess_vat_dirty;
 bool g_bases_dirty;  // Main only
-u8 g_current_vat;    // Main only
 std::array<VertexLoaderBase*, CP_NUM_VAT_REG> g_main_vertex_loaders;
 std::array<VertexLoaderBase*, CP_NUM_VAT_REG> g_preprocess_vertex_loaders;
 
@@ -78,7 +77,7 @@ void Clear()
 void UpdateVertexArrayPointers()
 {
   // Anything to update?
-  if (!g_bases_dirty)
+  if (!g_bases_dirty) [[likely]]
     return;
 
   // Some games such as Burnout 2 can put invalid addresses into
@@ -198,19 +197,21 @@ NativeVertexFormat* GetUberVertexFormat(const PortableVertexDeclaration& decl)
   return GetOrCreateMatchingFormat(new_decl);
 }
 
-static VertexLoaderBase* RefreshLoader(int vtx_attr_group, bool preprocess = false)
+namespace detail
 {
-  CPState* state = preprocess ? &g_preprocess_cp_state : &g_main_cp_state;
+template <bool IsPreprocess>
-  BitSet8& attr_dirty = preprocess ? g_preprocess_vat_dirty : g_main_vat_dirty;
+VertexLoaderBase* GetOrCreateLoader(int vtx_attr_group)
-  auto& vertex_loaders = preprocess ? g_preprocess_vertex_loaders : g_main_vertex_loaders;
+{
-  g_current_vat = vtx_attr_group;
+  constexpr CPState* state = IsPreprocess ? &g_preprocess_cp_state : &g_main_cp_state;
+  constexpr BitSet8& attr_dirty = IsPreprocess ? g_preprocess_vat_dirty : g_main_vat_dirty;
+  constexpr auto& vertex_loaders =
+      IsPreprocess ? g_preprocess_vertex_loaders : g_main_vertex_loaders;
 
   VertexLoaderBase* loader;
-  if (attr_dirty[vtx_attr_group])
+
-  {
   // We are not allowed to create a native vertex format on preprocessing as this is on the wrong
   // thread
-    bool check_for_native_format = !preprocess;
+  bool check_for_native_format = !IsPreprocess;
 
   VertexLoaderUID uid(state->vtx_desc, state->vtx_attr[vtx_attr_group]);
   std::lock_guard<std::mutex> lk(s_vertex_loader_map_lock);
@@ -222,35 +223,24 @@ static VertexLoaderBase* RefreshLoader(int vtx_attr_group, bool preprocess = fal
   }
   else
   {
-      s_vertex_loader_map[uid] =
+    auto [it, added] = s_vertex_loader_map.try_emplace(
-          VertexLoaderBase::CreateVertexLoader(state->vtx_desc, state->vtx_attr[vtx_attr_group]);
+        uid,
-      loader = s_vertex_loader_map[uid].get();
+        VertexLoaderBase::CreateVertexLoader(state->vtx_desc, state->vtx_attr[vtx_attr_group]));
+    loader = it->second.get();
     INCSTAT(g_stats.num_vertex_loaders);
   }
   if (check_for_native_format)
   {
     // search for a cached native vertex format
-      const PortableVertexDeclaration& format = loader->m_native_vtx_decl;
+    loader->m_native_vertex_format = GetOrCreateMatchingFormat(loader->m_native_vtx_decl);
-      std::unique_ptr<NativeVertexFormat>& native = s_native_vertex_map[format];
-      if (!native)
-        native = g_renderer->CreateNativeVertexFormat(format);
-      loader->m_native_vertex_format = native.get();
   }
   vertex_loaders[vtx_attr_group] = loader;
   attr_dirty[vtx_attr_group] = false;
-  }
-  else
-  {
-    loader = vertex_loaders[vtx_attr_group];
-  }
-
-  // Lookup pointers for any vertex arrays.
-  if (!preprocess)
-    UpdateVertexArrayPointers();
-
   return loader;
 }
 
+}  // namespace detail
+
 static void CheckCPConfiguration(int vtx_attr_group)
 {
   // Validate that the XF input configuration matches the CP configuration
@@ -335,21 +325,23 @@ static void CheckCPConfiguration(int vtx_attr_group)
   }
 }
 
-int RunVertices(int vtx_attr_group, OpcodeDecoder::Primitive primitive, int count, DataReader src,
+template <bool IsPreprocess>
-                bool is_preprocess)
+int RunVertices(int vtx_attr_group, OpcodeDecoder::Primitive primitive, int count, DataReader src)
 {
   if (count == 0)
     return 0;
   ASSERT(count > 0);
 
-  VertexLoaderBase* loader = RefreshLoader(vtx_attr_group, is_preprocess);
+  VertexLoaderBase* loader = RefreshLoader<IsPreprocess>(vtx_attr_group);
 
   int size = count * loader->m_vertex_size;
   if ((int)src.size() < size)
     return -1;
 
-  if (is_preprocess)
+  if constexpr (!IsPreprocess)
-    return size;
+  {
+    // Doing early return for the opposite case would be cleaner
+    // but triggers a false unreachable code warning in MSVC debug builds.
 
     CheckCPConfiguration(vtx_attr_group);
 
@@ -379,9 +371,15 @@ int RunVertices(int vtx_attr_group, OpcodeDecoder::Primitive primitive, int coun
 
     ADDSTAT(g_stats.this_frame.num_prims, count);
     INCSTAT(g_stats.this_frame.num_primitive_joins);
+  }
   return size;
 }
 
+template int RunVertices<false>(int vtx_attr_group, OpcodeDecoder::Primitive primitive, int count,
+                                DataReader src);
+template int RunVertices<true>(int vtx_attr_group, OpcodeDecoder::Primitive primitive, int count,
+                               DataReader src);
+
 NativeVertexFormat* GetCurrentVertexFormat()
 {
   return s_current_vtx_fmt;

Source/Core/VideoCommon/VertexLoaderManager.h

@@ -42,8 +42,16 @@ NativeVertexFormat* GetOrCreateMatchingFormat(const PortableVertexDeclaration& d
 NativeVertexFormat* GetUberVertexFormat(const PortableVertexDeclaration& decl);
 
 // Returns -1 if buf_size is insufficient, else the amount of bytes consumed
-int RunVertices(int vtx_attr_group, OpcodeDecoder::Primitive primitive, int count, DataReader src,
+template <bool IsPreprocess = false>
-                bool is_preprocess);
+int RunVertices(int vtx_attr_group, OpcodeDecoder::Primitive primitive, int count, DataReader src);
+
+namespace detail
+{
+// This will look for an existing loader in the global hashmap or create a new one if there is none.
+// It should not be used directly because RefreshLoaders() has another cache for fast lookups.
+template <bool IsPreprocess = false>
+VertexLoaderBase* GetOrCreateLoader(int vtx_attr_group);
+}  // namespace detail
 
 NativeVertexFormat* GetCurrentVertexFormat();
 
@@ -66,7 +74,31 @@ extern u32 g_current_components;
 extern BitSet8 g_main_vat_dirty;
 extern BitSet8 g_preprocess_vat_dirty;
 extern bool g_bases_dirty;  // Main only
-extern u8 g_current_vat;    // Main only
 extern std::array<VertexLoaderBase*, CP_NUM_VAT_REG> g_main_vertex_loaders;
 extern std::array<VertexLoaderBase*, CP_NUM_VAT_REG> g_preprocess_vertex_loaders;
+
+template <bool IsPreprocess = false>
+VertexLoaderBase* RefreshLoader(int vtx_attr_group)
+{
+  constexpr const BitSet8& attr_dirty = IsPreprocess ? g_preprocess_vat_dirty : g_main_vat_dirty;
+  constexpr const auto& vertex_loaders =
+      IsPreprocess ? g_preprocess_vertex_loaders : g_main_vertex_loaders;
+
+  VertexLoaderBase* loader;
+  if (!attr_dirty[vtx_attr_group]) [[likely]]
+  {
+    loader = vertex_loaders[vtx_attr_group];
+  }
+  else [[unlikely]]
+  {
+    loader = detail::GetOrCreateLoader<IsPreprocess>(vtx_attr_group);
+  }
+
+  // Lookup pointers for any vertex arrays.
+  if constexpr (!IsPreprocess)
+    UpdateVertexArrayPointers();
+
+  return loader;
+}
+
 }  // namespace VertexLoaderManager