[D3D12] Cleanup raw buffer view creation

src/xenia/gpu/d3d12/render_target_cache.h

@@ -417,6 +417,10 @@ class RenderTargetCache {
 
   // The EDRAM buffer allowing color and depth data to be reinterpreted.
   ID3D12Resource* edram_buffer_ = nullptr;
+  // Two 10 MB pages, one containing color and integer depth data, another with
+  // 32-bit float depth when 20e4 depth is used to allow for multipass drawing
+  // without precision loss in case of EDRAM store/load.
+  static constexpr uint32_t kEDRAMBufferSize = 2 * 2048 * 5120;
   D3D12_RESOURCE_STATES edram_buffer_state_;
   bool edram_buffer_cleared_;