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_stream_buffer.cpp | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) (limited to 'src/video_core/renderer_vulkan/vk_stream_buffer.cpp') diff --git a/src/video_core/renderer_vulkan/vk_stream_buffer.cpp b/src/video_core/renderer_vulkan/vk_stream_buffer.cpp index 3c9171a5e..5218c875b 100644 --- a/src/video_core/renderer_vulkan/vk_stream_buffer.cpp +++ b/src/video_core/renderer_vulkan/vk_stream_buffer.cpp @@ -11,7 +11,6 @@ #include "common/alignment.h" #include "common/assert.h" #include "video_core/renderer_vulkan/vk_device.h" -#include "video_core/renderer_vulkan/vk_resource_manager.h" #include "video_core/renderer_vulkan/vk_scheduler.h" #include "video_core/renderer_vulkan/vk_stream_buffer.h" #include "video_core/renderer_vulkan/wrapper.h" @@ -111,7 +110,7 @@ void VKStreamBuffer::Unmap(u64 size) { } auto& watch = current_watches[current_watch_cursor++]; watch.upper_bound = offset; - watch.fence.Watch(scheduler.GetFence()); + watch.tick = scheduler.CurrentTick(); } void VKStreamBuffer::CreateBuffers(VkBufferUsageFlags usage) { @@ -157,7 +156,7 @@ void VKStreamBuffer::WaitPendingOperations(u64 requested_upper_bound) { while (requested_upper_bound < wait_bound && wait_cursor < *invalidation_mark) { auto& watch = previous_watches[wait_cursor]; wait_bound = watch.upper_bound; - watch.fence.Wait(); + scheduler.Wait(watch.tick); ++wait_cursor; } } -- cgit v1.2.3