From 4ba2428c86d95fdfe9c580dd62e4a94309a4661c Mon Sep 17 00:00:00 2001
From: bunnei <bunneidev@gmail.com>
Date: Wed, 8 Apr 2020 17:35:07 -0400
Subject: common: Add VirtualBuffer class, to abstract memory virtualization.

---
 src/common/virtual_buffer.h | 58 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 src/common/virtual_buffer.h

(limited to 'src/common/virtual_buffer.h')

diff --git a/src/common/virtual_buffer.h b/src/common/virtual_buffer.h
new file mode 100644
index 000000000..da064e59e
--- /dev/null
+++ b/src/common/virtual_buffer.h
@@ -0,0 +1,58 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "common/common_funcs.h"
+
+namespace Common {
+
+void* AllocateMemoryPages(std::size_t size);
+void FreeMemoryPages(void* base, std::size_t size);
+
+template <typename T>
+class VirtualBuffer final : NonCopyable {
+public:
+    constexpr VirtualBuffer() = default;
+    explicit VirtualBuffer(std::size_t count) : alloc_size{count * sizeof(T)} {
+        base_ptr = reinterpret_cast<T*>(AllocateMemoryPages(alloc_size));
+    }
+
+    ~VirtualBuffer() {
+        FreeMemoryPages(base_ptr, alloc_size);
+    }
+
+    void resize(std::size_t count) {
+        FreeMemoryPages(base_ptr, alloc_size);
+
+        alloc_size = count * sizeof(T);
+        base_ptr = reinterpret_cast<T*>(AllocateMemoryPages(alloc_size));
+    }
+
+    constexpr const T& operator[](std::size_t index) const {
+        return base_ptr[index];
+    }
+
+    constexpr T& operator[](std::size_t index) {
+        return base_ptr[index];
+    }
+
+    constexpr T* data() {
+        return base_ptr;
+    }
+
+    constexpr const T* data() const {
+        return base_ptr;
+    }
+
+    constexpr std::size_t size() const {
+        return alloc_size / sizeof(T);
+    }
+
+private:
+    std::size_t alloc_size{};
+    T* base_ptr{};
+};
+
+} // namespace Common
-- 
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