Various fixes and utilties.

src/xenia/gpu/gl4/gl4_graphics_system.cc

@@ -235,6 +235,11 @@ void GL4GraphicsSystem::PlayTrace(const uint8_t* trace_data, size_t trace_size,
       });
 }
 
+void GL4GraphicsSystem::ClearCaches() {
+  command_processor_->CallInThread(
+      [&]() { command_processor_->texture_cache()->Clear(); });
+}
+
 void GL4GraphicsSystem::MarkVblank() {
   static bool thread_name_set = false;
   if (!thread_name_set) {

src/xenia/gpu/gl4/gl4_graphics_system.h

@@ -46,6 +46,7 @@ class GL4GraphicsSystem : public GraphicsSystem {
   void EndTracing() override;
   void PlayTrace(const uint8_t* trace_data, size_t trace_size,
                  TracePlaybackMode playback_mode) override;
+  void ClearCaches() override;
 
  private:
   void MarkVblank();