[D3D12] Switch from gflags to cvars

src/xenia/gpu/d3d12/shared_memory.cc

@@ -9,12 +9,11 @@
 
 #include "xenia/gpu/d3d12/shared_memory.h"
 
-#include <gflags/gflags.h>
-
 #include <algorithm>
 #include <cstring>
 
 #include "xenia/base/assert.h"
+#include "xenia/base/cvar.h"
 #include "xenia/base/logging.h"
 #include "xenia/base/math.h"
 #include "xenia/base/memory.h"
@@ -26,7 +25,8 @@ DEFINE_bool(d3d12_tiled_shared_memory, true,
             "Enable tiled resources for shared memory emulation. Disabling "
             "them greatly increases video memory usage - a 512 MB buffer is "
             "created - but allows graphics debuggers that don't support tiled "
-            "resources to work.");
+            "resources to work.",
+            "D3D12");
 
 namespace xe {
 namespace gpu {
@@ -453,7 +453,7 @@ void SharedMemory::RangeWrittenByGPU(uint32_t start, uint32_t length) {
 }
 
 bool SharedMemory::AreTiledResourcesUsed() const {
-  if (!FLAGS_d3d12_tiled_shared_memory) {
+  if (!cvars::d3d12_tiled_shared_memory) {
     return false;
   }
   auto provider = command_processor_->GetD3D12Context()->GetD3D12Provider();