[GPU] TextureCache lockless pre-check

lockless accessors for base_outdated/mips_outdated and skip lock
acquisition when textures appear up to date

src/xenia/gpu/texture_cache.cc

@@ -693,6 +693,21 @@ void TextureCache::LoadTexturesData(Texture** textures, uint32_t n_textures) {
     }
   }
 
+  // Lockless pre-check: count how many textures appear outdated.
+  // If none appear outdated, skip the lock entirely.
+  uint32_t likely_outdated = 0;
+  for (uint32_t i = 0; i < n_textures; ++i) {
+    Texture* current = textures[i];
+    if (current->base_outdated_lockless() ||
+        current->mips_outdated_lockless()) {
+      ++likely_outdated;
+    }
+  }
+  if (likely_outdated == 0) {
+    // All textures appear up-to-date, skip lock acquisition
+    return;
+  }
+
   uint64_t index_base_outdated = 0;
   uint64_t index_mips_outdated = 0;
   uint32_t nkept = 0;
@@ -811,6 +826,13 @@ void TextureCache::LoadTexturesData(Texture** textures, uint32_t n_textures) {
   }
 }
 bool TextureCache::LoadTextureData(Texture& texture) {
+  // Lockless pre-check: if texture appears up-to-date, skip the lock.
+  // This is safe because worst case is a false positive (we acquire lock
+  // unnecessarily), never a false negative.
+  if (!texture.base_outdated_lockless() && !texture.mips_outdated_lockless()) {
+    return true;
+  }
+
   // Check what needs to be uploaded.
   bool base_outdated, mips_outdated;
   {

src/xenia/gpu/texture_cache.h

@@ -276,6 +276,11 @@ class TextureCache {
     bool mips_outdated(const global_unique_lock_type& global_lock) const {
       return mips_outdated_;
     }
+    // Lockless accessors for pre-check optimization.
+    // Safe to read without lock - worst case is false positive (outdated when
+    // not).
+    bool base_outdated_lockless() const { return base_outdated_; }
+    bool mips_outdated_lockless() const { return mips_outdated_; }
     void MakeUpToDateAndWatch(const global_unique_lock_type& global_lock);
 
     void WatchCallback(const global_unique_lock_type& global_lock, bool is_mip);