Implement Fence Cycle, Memory Manager and Command Scheduler

Implements a wrapper over fences to track a single cycle of activation, implement a Vulkan memory manager that wraps the Vulkan-Memory-Allocator library and a command scheduler for scheduling Vulkan command buffers

app/src/main/cpp/skyline/gpu/memory_manager.h

@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: MPL-2.0
+// Copyright © 2021 Skyline Team and Contributors (https://github.com/skyline-emu/)
+
+#pragma once
+
+#include <vk_mem_alloc.h>
+#include "fence_cycle.h"
+
+namespace skyline::gpu::memory {
+    /**
+     * @brief A view into a CPU mapping of a Vulkan buffer
+     * @note The mapping **should not** be used after the lifetime of the object has ended
+     */
+    struct StagingBuffer : public span<u8>, FenceCycleDependency {
+        VmaAllocator vmaAllocator;
+        VmaAllocation vmaAllocation;
+        vk::Buffer vkBuffer;
+
+        constexpr StagingBuffer(u8 *pointer, size_t size, VmaAllocator vmaAllocator, vk::Buffer vkBuffer, VmaAllocation vmaAllocation) : vmaAllocator(vmaAllocator), vkBuffer(vkBuffer), vmaAllocation(vmaAllocation), span(pointer, size) {}
+
+        ~StagingBuffer();
+    };
+
+    /**
+     * @brief An abstraction over memory operations done in Vulkan, it's used for all allocations on the host GPU
+     */
+    class MemoryManager {
+      private:
+        const GPU &gpu;
+        VmaAllocator vmaAllocator{VK_NULL_HANDLE};
+
+        /**
+         * @brief If the result isn't VK_SUCCESS then an exception is thrown
+         */
+        static void ThrowOnFail(VkResult result, const char *function = __builtin_FUNCTION());
+
+      public:
+        MemoryManager(const GPU &gpu);
+
+        ~MemoryManager();
+
+        /**
+         * @brief Creates a buffer which is optimized for staging (Transfer Source)
+         */
+        std::shared_ptr<StagingBuffer> AllocateStagingBuffer(vk::DeviceSize size);
+    };
+}