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Diffstat (limited to 'src/video_core/vulkan_common/vulkan_memory_allocator.h')
-rw-r--r-- | src/video_core/vulkan_common/vulkan_memory_allocator.h | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/src/video_core/vulkan_common/vulkan_memory_allocator.h b/src/video_core/vulkan_common/vulkan_memory_allocator.h new file mode 100644 index 000000000..9e6cfabf9 --- /dev/null +++ b/src/video_core/vulkan_common/vulkan_memory_allocator.h @@ -0,0 +1,117 @@ +// 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; + +/// Hints and requirements for the backing memory type of a commit +enum class MemoryUsage { + DeviceLocal, ///< Hints device local usages, fastest memory type to read and write from the GPU + Upload, ///< Requires a host visible memory type optimized for CPU to GPU uploads + Download, ///< Requires a host visible memory type optimized for GPU to CPU readbacks +}; + +/// Ownership handle of a memory commitment. +/// Points to a subregion of a memory allocation. +class MemoryCommit { +public: + explicit MemoryCommit() noexcept = default; + explicit MemoryCommit(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>(begin); + } + +private: + void Release(); + + MemoryAllocation* allocation{}; ///< Pointer to the large memory allocation. + VkDeviceMemory memory{}; ///< Vulkan device memory handler. + u64 begin{}; ///< Beginning offset in bytes to where the commit exists. + u64 end{}; ///< Offset in bytes where the commit ends. + std::span<u8> span; ///< Host visible memory span. Empty if not queried before. +}; + +/// Memory allocator container. +/// Allocates and releases memory allocations on demand. +class MemoryAllocator { +public: + explicit MemoryAllocator(const Device& device_); + ~MemoryAllocator(); + + MemoryAllocator& operator=(const MemoryAllocator&) = delete; + MemoryAllocator(const MemoryAllocator&) = delete; + + /** + * Commits a memory with the specified requirements. + * + * @param requirements Requirements returned from a Vulkan call. + * @param usage Indicates how the memory will be used. + * + * @returns A memory commit. + */ + MemoryCommit Commit(const VkMemoryRequirements& requirements, MemoryUsage usage); + + /// Commits memory required by the buffer and binds it. + MemoryCommit Commit(const vk::Buffer& buffer, MemoryUsage usage); + + /// Commits memory required by the image and binds it. + MemoryCommit Commit(const vk::Image& image, MemoryUsage usage); + +private: + /// Allocates a chunk of memory. + void AllocMemory(VkMemoryPropertyFlags flags, u32 type_mask, u64 size); + + /// Tries to allocate a memory commit. + std::optional<MemoryCommit> TryCommit(const VkMemoryRequirements& requirements, + VkMemoryPropertyFlags flags); + + /// Returns the fastest compatible memory property flags from a wanted usage. + VkMemoryPropertyFlags MemoryPropertyFlags(u32 type_mask, MemoryUsage usage) const; + + /// Returns the fastest compatible memory property flags from the wanted flags. + VkMemoryPropertyFlags MemoryPropertyFlags(u32 type_mask, VkMemoryPropertyFlags flags) const; + + /// Returns index to the fastest memory type compatible with the passed requirements. + std::optional<u32> FindType(VkMemoryPropertyFlags flags, u32 type_mask) const; + + const Device& device; ///< Device handle. + const VkPhysicalDeviceMemoryProperties properties; ///< Physical device properties. + std::vector<std::unique_ptr<MemoryAllocation>> allocations; ///< Current allocations. +}; + +/// Returns true when a memory usage is guaranteed to be host visible. +bool IsHostVisible(MemoryUsage usage) noexcept; + +} // namespace Vulkan |