rasterizer_cache: Add support for texture dumping

src/common/scratch_buffer.h

@@ -0,0 +1,40 @@
+// Copyright 2023 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <type_traits>
+#include <span>
+#include <memory>
+#include "common/common_types.h"
+
+namespace Common {
+
+template <typename T, u32 alignment = 0>
+class ScratchBuffer {
+    static_assert(std::is_trivial_v<T>, "Must use a POD type");
+
+public:
+    ScratchBuffer(std::size_t size_) : size{size_} {
+        buffer = std::unique_ptr<T>(new typename std::remove_extent<T>::type[size]);
+    }
+
+    [[nodiscard]] std::size_t Size() const noexcept {
+        return size;
+    }
+
+    [[nodiscard]] T* Data() const noexcept {
+        return buffer.get();
+    }
+
+    [[nodiscard]] std::span<const T> Span() const noexcept {
+        return std::span<const T>{buffer.get(), size};
+    }
+
+private:
+    std::unique_ptr<T> buffer;
+    std::size_t size;
+};
+
+} // namespace Common