forked from suyu/suyu
58b0ae84b5
This reworks how host<->device synchronization works on the Vulkan backend. Instead of "protecting" resources with a fence and signalling these as free when the fence is known to be signalled by the host GPU, use timeline semaphores. Vulkan timeline semaphores allow use to work on a subset of D3D12 fences. As far as we are concerned, timeline semaphores are a value set by the host or the device that can be waited by either of them. Taking advantange of this, we can have a monolithically increasing atomic value for each submission to the graphics queue. Instead of protecting resources with a fence, we simply store the current logical tick (the atomic value stored in CPU memory). When we want to know if a resource is free, it can be compared to the current GPU tick. This greatly simplifies resource management code and the free status of resources should have less false negatives. To workaround bugs in validation layers, when these are attached there's a thread waiting for timeline semaphores.
71 lines
1.8 KiB
C++
71 lines
1.8 KiB
C++
// Copyright 2019 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <climits>
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#include <vector>
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#include "common/common_types.h"
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#include "video_core/renderer_vulkan/vk_memory_manager.h"
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#include "video_core/renderer_vulkan/wrapper.h"
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namespace Vulkan {
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class VKDevice;
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class VKScheduler;
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struct VKBuffer final {
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vk::Buffer handle;
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VKMemoryCommit commit;
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};
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class VKStagingBufferPool final {
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public:
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explicit VKStagingBufferPool(const VKDevice& device, VKMemoryManager& memory_manager,
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VKScheduler& scheduler);
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~VKStagingBufferPool();
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VKBuffer& GetUnusedBuffer(std::size_t size, bool host_visible);
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void TickFrame();
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private:
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struct StagingBuffer final {
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explicit StagingBuffer(std::unique_ptr<VKBuffer> buffer);
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std::unique_ptr<VKBuffer> buffer;
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u64 tick = 0;
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};
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struct StagingBuffers final {
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std::vector<StagingBuffer> entries;
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std::size_t delete_index = 0;
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};
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static constexpr std::size_t NumLevels = sizeof(std::size_t) * CHAR_BIT;
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using StagingBuffersCache = std::array<StagingBuffers, NumLevels>;
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VKBuffer* TryGetReservedBuffer(std::size_t size, bool host_visible);
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VKBuffer& CreateStagingBuffer(std::size_t size, bool host_visible);
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StagingBuffersCache& GetCache(bool host_visible);
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void ReleaseCache(bool host_visible);
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u64 ReleaseLevel(StagingBuffersCache& cache, std::size_t log2);
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const VKDevice& device;
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VKMemoryManager& memory_manager;
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VKScheduler& scheduler;
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StagingBuffersCache host_staging_buffers;
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StagingBuffersCache device_staging_buffers;
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std::size_t current_delete_level = 0;
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};
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} // namespace Vulkan
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