From 58b0ae84b56996304b6ad373e4f6cff2cf6bdd41 Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
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_opengl/gl_query_cache.cpp |  8 ++++----
 src/video_core/renderer_opengl/gl_query_cache.h   | 11 +++++++----
 2 files changed, 11 insertions(+), 8 deletions(-)

(limited to 'src/video_core/renderer_opengl')

diff --git a/src/video_core/renderer_opengl/gl_query_cache.cpp b/src/video_core/renderer_opengl/gl_query_cache.cpp
index 2bb8ec2b8..1a3d9720e 100644
--- a/src/video_core/renderer_opengl/gl_query_cache.cpp
+++ b/src/video_core/renderer_opengl/gl_query_cache.cpp
@@ -32,10 +32,8 @@ constexpr GLenum GetTarget(VideoCore::QueryType type) {
 
 QueryCache::QueryCache(RasterizerOpenGL& rasterizer, Tegra::Engines::Maxwell3D& maxwell3d,
                        Tegra::MemoryManager& gpu_memory)
-    : VideoCommon::QueryCacheBase<
-          QueryCache, CachedQuery, CounterStream, HostCounter,
-          std::vector<OGLQuery>>{static_cast<VideoCore::RasterizerInterface&>(rasterizer),
-                                 maxwell3d, gpu_memory},
+    : VideoCommon::QueryCacheBase<QueryCache, CachedQuery, CounterStream, HostCounter>(
+          rasterizer, maxwell3d, gpu_memory),
       gl_rasterizer{rasterizer} {}
 
 QueryCache::~QueryCache() = default;
@@ -91,6 +89,8 @@ u64 HostCounter::BlockingQuery() const {
 CachedQuery::CachedQuery(QueryCache& cache, VideoCore::QueryType type, VAddr cpu_addr, u8* host_ptr)
     : VideoCommon::CachedQueryBase<HostCounter>{cpu_addr, host_ptr}, cache{&cache}, type{type} {}
 
+CachedQuery::~CachedQuery() = default;
+
 CachedQuery::CachedQuery(CachedQuery&& rhs) noexcept
     : VideoCommon::CachedQueryBase<HostCounter>(std::move(rhs)), cache{rhs.cache}, type{rhs.type} {}
 
diff --git a/src/video_core/renderer_opengl/gl_query_cache.h b/src/video_core/renderer_opengl/gl_query_cache.h
index dd626b66b..82cac51ee 100644
--- a/src/video_core/renderer_opengl/gl_query_cache.h
+++ b/src/video_core/renderer_opengl/gl_query_cache.h
@@ -26,8 +26,8 @@ class RasterizerOpenGL;
 
 using CounterStream = VideoCommon::CounterStreamBase<QueryCache, HostCounter>;
 
-class QueryCache final : public VideoCommon::QueryCacheBase<QueryCache, CachedQuery, CounterStream,
-                                                            HostCounter, std::vector<OGLQuery>> {
+class QueryCache final
+    : public VideoCommon::QueryCacheBase<QueryCache, CachedQuery, CounterStream, HostCounter> {
 public:
     explicit QueryCache(RasterizerOpenGL& rasterizer, Tegra::Engines::Maxwell3D& maxwell3d,
                         Tegra::MemoryManager& gpu_memory);
@@ -41,6 +41,7 @@ public:
 
 private:
     RasterizerOpenGL& gl_rasterizer;
+    std::array<std::vector<OGLQuery>, VideoCore::NumQueryTypes> query_pools;
 };
 
 class HostCounter final : public VideoCommon::HostCounterBase<QueryCache, HostCounter> {
@@ -63,10 +64,12 @@ class CachedQuery final : public VideoCommon::CachedQueryBase<HostCounter> {
 public:
     explicit CachedQuery(QueryCache& cache, VideoCore::QueryType type, VAddr cpu_addr,
                          u8* host_ptr);
-    CachedQuery(CachedQuery&& rhs) noexcept;
-    CachedQuery(const CachedQuery&) = delete;
+    ~CachedQuery() override;
 
+    CachedQuery(CachedQuery&& rhs) noexcept;
     CachedQuery& operator=(CachedQuery&& rhs) noexcept;
+
+    CachedQuery(const CachedQuery&) = delete;
     CachedQuery& operator=(const CachedQuery&) = delete;
 
     void Flush() override;
-- 
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