vulkan_common: Move allocator to the common directory

Allow using the abstraction from the OpenGL backend.

src/video_core/vulkan_common/vulkan_memory_allocator.h

@@ -0,0 +1,95 @@
+// Copyright 2019 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include <span>
+#include <utility>
+#include <vector>
+#include "common/common_types.h"
+#include "video_core/vulkan_common/vulkan_wrapper.h"
+
+namespace Vulkan {
+
+class Device;
+class MemoryMap;
+class MemoryAllocation;
+
+class MemoryCommit final {
+public:
+    explicit MemoryCommit() noexcept = default;
+    explicit MemoryCommit(const Device& device_, MemoryAllocation* allocation_,
+                          VkDeviceMemory memory_, u64 begin, u64 end) noexcept;
+    ~MemoryCommit();
+
+    MemoryCommit& operator=(MemoryCommit&&) noexcept;
+    MemoryCommit(MemoryCommit&&) noexcept;
+
+    MemoryCommit& operator=(const MemoryCommit&) = delete;
+    MemoryCommit(const MemoryCommit&) = delete;
+
+    /// Returns a host visible memory map.
+    /// It will map the backing allocation if it hasn't been mapped before.
+    std::span<u8> Map();
+
+    /// Returns the Vulkan memory handler.
+    VkDeviceMemory Memory() const {
+        return memory;
+    }
+
+    /// Returns the start position of the commit relative to the allocation.
+    VkDeviceSize Offset() const {
+        return static_cast<VkDeviceSize>(interval.first);
+    }
+
+private:
+    void Release();
+
+    const Device* device{};         ///< Vulkan device.
+    MemoryAllocation* allocation{}; ///< Pointer to the large memory allocation.
+    VkDeviceMemory memory{};        ///< Vulkan device memory handler.
+    std::pair<u64, u64> interval{}; ///< Interval where the commit exists.
+    std::span<u8> span;             ///< Host visible memory span. Empty if not queried before.
+};
+
+class MemoryAllocator final {
+public:
+    explicit MemoryAllocator(const Device& device_);
+    ~MemoryAllocator();
+
+    MemoryAllocator& operator=(const MemoryAllocator&) = delete;
+    MemoryAllocator(const MemoryAllocator&) = delete;
+
+    /**
+     * Commits a memory with the specified requeriments.
+     *
+     * @param requirements Requirements returned from a Vulkan call.
+     * @param host_visible Signals the allocator that it *must* use host visible and coherent
+     *                     memory. When passing false, it will try to allocate device local memory.
+     *
+     * @returns A memory commit.
+     */
+    MemoryCommit Commit(const VkMemoryRequirements& requirements, bool host_visible);
+
+    /// Commits memory required by the buffer and binds it.
+    MemoryCommit Commit(const vk::Buffer& buffer, bool host_visible);
+
+    /// Commits memory required by the image and binds it.
+    MemoryCommit Commit(const vk::Image& image, bool host_visible);
+
+private:
+    /// Allocates a chunk of memory.
+    void AllocMemory(VkMemoryPropertyFlags wanted_properties, u32 type_mask, u64 size);
+
+    /// Tries to allocate a memory commit.
+    std::optional<MemoryCommit> TryAllocCommit(const VkMemoryRequirements& requirements,
+                                               VkMemoryPropertyFlags wanted_properties);
+
+    const Device& device;                                       ///< Device handler.
+    const VkPhysicalDeviceMemoryProperties properties;          ///< Physical device properties.
+    std::vector<std::unique_ptr<MemoryAllocation>> allocations; ///< Current allocations.
+};
+
+} // namespace Vulkan