From 58b0ae84b56996304b6ad373e4f6cff2cf6bdd41 Mon Sep 17 00:00:00 2001 From: ReinUsesLisp Date: Thu, 10 Sep 2020 03:43:30 -0300 Subject: renderer_vulkan: Make unconditional use of VK_KHR_timeline_semaphore 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. --- src/video_core/renderer_vulkan/vk_command_pool.cpp | 41 ++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 src/video_core/renderer_vulkan/vk_command_pool.cpp (limited to 'src/video_core/renderer_vulkan/vk_command_pool.cpp') diff --git a/src/video_core/renderer_vulkan/vk_command_pool.cpp b/src/video_core/renderer_vulkan/vk_command_pool.cpp new file mode 100644 index 000000000..f1abd4b1a --- /dev/null +++ b/src/video_core/renderer_vulkan/vk_command_pool.cpp @@ -0,0 +1,41 @@ +// Copyright 2020 yuzu Emulator Project +// Licensed under GPLv2 or any later version +// Refer to the license.txt file included. + +#include + +#include "video_core/renderer_vulkan/vk_command_pool.h" +#include "video_core/renderer_vulkan/vk_device.h" +#include "video_core/renderer_vulkan/wrapper.h" + +namespace Vulkan { + +constexpr size_t COMMAND_BUFFER_POOL_SIZE = 0x1000; + +CommandPool::CommandPool(MasterSemaphore& master_semaphore, const VKDevice& device) + : ResourcePool(master_semaphore, COMMAND_BUFFER_POOL_SIZE), device{device} {} + +CommandPool::~CommandPool() = default; + +void CommandPool::Allocate(size_t begin, size_t end) { + // Command buffers are going to be commited, recorded, executed every single usage cycle. + // They are also going to be reseted when commited. + Pool& pool = pools.emplace_back(); + pool.handle = device.GetLogical().CreateCommandPool({ + .sType = VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO, + .pNext = nullptr, + .flags = + VK_COMMAND_POOL_CREATE_TRANSIENT_BIT | VK_COMMAND_POOL_CREATE_RESET_COMMAND_BUFFER_BIT, + .queueFamilyIndex = device.GetGraphicsFamily(), + }); + pool.cmdbufs = pool.handle.Allocate(COMMAND_BUFFER_POOL_SIZE); +} + +VkCommandBuffer CommandPool::Commit() { + const size_t index = CommitResource(); + const auto pool_index = index / COMMAND_BUFFER_POOL_SIZE; + const auto sub_index = index % COMMAND_BUFFER_POOL_SIZE; + return pools[pool_index].cmdbufs[sub_index]; +} + +} // namespace Vulkan -- cgit v1.2.3