[UI] UploadBufferPool common code

src/xenia/ui/d3d12/d3d12_upload_buffer_pool.h

@@ -0,0 +1,57 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2020 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_UI_D3D12_D3D12_UPLOAD_BUFFER_POOL_H_
+#define XENIA_UI_D3D12_D3D12_UPLOAD_BUFFER_POOL_H_
+
+#include "xenia/ui/d3d12/d3d12_provider.h"
+#include "xenia/ui/graphics_upload_buffer_pool.h"
+
+namespace xe {
+namespace ui {
+namespace d3d12 {
+
+// Submission index is the fence value or a value derived from it (if reclaiming
+// less often than once per fence value, for instance).
+
+class D3D12UploadBufferPool : public GraphicsUploadBufferPool {
+ public:
+  D3D12UploadBufferPool(D3D12Provider& provider,
+                        size_t page_size = kDefaultPageSize);
+
+  uint8_t* Request(uint64_t submission_index, size_t size, size_t alignment,
+                   ID3D12Resource** buffer_out, size_t* offset_out,
+                   D3D12_GPU_VIRTUAL_ADDRESS* gpu_address_out);
+  uint8_t* RequestPartial(uint64_t submission_index, size_t size,
+                          size_t alignment, ID3D12Resource** buffer_out,
+                          size_t* offset_out, size_t* size_out,
+                          D3D12_GPU_VIRTUAL_ADDRESS* gpu_address_out);
+
+ protected:
+  Page* CreatePageImplementation() override;
+
+ private:
+  struct D3D12Page : public Page {
+    // Creates a reference to the buffer. It must not be unmapped until this
+    // D3D12Page is deleted.
+    D3D12Page(ID3D12Resource* buffer, void* mapping);
+    ~D3D12Page() override;
+    ID3D12Resource* buffer_;
+    void* mapping_;
+    D3D12_GPU_VIRTUAL_ADDRESS gpu_address_;
+  };
+
+  D3D12Provider& provider_;
+};
+
+}  // namespace d3d12
+}  // namespace ui
+}  // namespace xe
+
+#endif  // XENIA_UI_D3D12_D3D12_UPLOAD_BUFFER_POOL_H_