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// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <algorithm>
#include <cstring>
#include <memory>
#include <queue>
#include "common/common_types.h"
#include "video_core/delayed_destruction_ring.h"
#include "video_core/gpu.h"
#include "video_core/rasterizer_interface.h"
namespace VideoCommon {
class FenceBase {
public:
explicit FenceBase(u32 payload_, bool is_stubbed_)
: address{}, payload{payload_}, is_semaphore{false}, is_stubbed{is_stubbed_} {}
explicit FenceBase(u8* address_, u32 payload_, bool is_stubbed_)
: address{address_}, payload{payload_}, is_semaphore{true}, is_stubbed{is_stubbed_} {}
u8* GetAddress() const {
return address;
}
u32 GetPayload() const {
return payload;
}
bool IsSemaphore() const {
return is_semaphore;
}
private:
u8* address;
u32 payload;
bool is_semaphore;
protected:
bool is_stubbed;
};
template <typename TFence, typename TTextureCache, typename TTBufferCache, typename TQueryCache>
class FenceManager {
public:
/// Notify the fence manager about a new frame
void TickFrame() {
delayed_destruction_ring.Tick();
}
// Unlike other fences, this one doesn't
void SignalOrdering() {
std::scoped_lock lock{buffer_cache.mutex};
buffer_cache.AccumulateFlushes();
}
void SignalSemaphore(u8* addr, u32 value) {
TryReleasePendingFences();
const bool should_flush = ShouldFlush();
CommitAsyncFlushes();
TFence new_fence = CreateFence(addr, value, !should_flush);
fences.push(new_fence);
QueueFence(new_fence);
if (should_flush) {
rasterizer.FlushCommands();
}
rasterizer.SyncGuestHost();
}
void SignalSyncPoint(u32 value) {
TryReleasePendingFences();
const bool should_flush = ShouldFlush();
CommitAsyncFlushes();
TFence new_fence = CreateFence(value, !should_flush);
fences.push(new_fence);
QueueFence(new_fence);
if (should_flush) {
rasterizer.FlushCommands();
}
rasterizer.SyncGuestHost();
}
void WaitPendingFences() {
while (!fences.empty()) {
TFence& current_fence = fences.front();
if (ShouldWait()) {
WaitFence(current_fence);
}
PopAsyncFlushes();
if (current_fence->IsSemaphore()) {
char* address = reinterpret_cast<char*>(current_fence->GetAddress());
auto payload = current_fence->GetPayload();
std::memcpy(address, &payload, sizeof(payload));
} else {
gpu.IncrementSyncPoint(current_fence->GetPayload());
}
PopFence();
}
}
protected:
explicit FenceManager(VideoCore::RasterizerInterface& rasterizer_, Tegra::GPU& gpu_,
TTextureCache& texture_cache_, TTBufferCache& buffer_cache_,
TQueryCache& query_cache_)
: rasterizer{rasterizer_}, gpu{gpu_}, texture_cache{texture_cache_},
buffer_cache{buffer_cache_}, query_cache{query_cache_} {}
virtual ~FenceManager() = default;
/// Creates a Sync Point Fence Interface, does not create a backend fence if 'is_stubbed' is
/// true
virtual TFence CreateFence(u32 value, bool is_stubbed) = 0;
/// Creates a Semaphore Fence Interface, does not create a backend fence if 'is_stubbed' is true
virtual TFence CreateFence(u8* addr, u32 value, bool is_stubbed) = 0;
/// Queues a fence into the backend if the fence isn't stubbed.
virtual void QueueFence(TFence& fence) = 0;
/// Notifies that the backend fence has been signaled/reached in host GPU.
virtual bool IsFenceSignaled(TFence& fence) const = 0;
/// Waits until a fence has been signalled by the host GPU.
virtual void WaitFence(TFence& fence) = 0;
VideoCore::RasterizerInterface& rasterizer;
Tegra::GPU& gpu;
TTextureCache& texture_cache;
TTBufferCache& buffer_cache;
TQueryCache& query_cache;
private:
void TryReleasePendingFences() {
while (!fences.empty()) {
TFence& current_fence = fences.front();
if (ShouldWait() && !IsFenceSignaled(current_fence)) {
return;
}
PopAsyncFlushes();
if (current_fence->IsSemaphore()) {
char* address = reinterpret_cast<char*>(current_fence->GetAddress());
const auto payload = current_fence->GetPayload();
std::memcpy(address, &payload, sizeof(payload));
} else {
gpu.IncrementSyncPoint(current_fence->GetPayload());
}
PopFence();
}
}
bool ShouldWait() const {
std::scoped_lock lock{buffer_cache.mutex, texture_cache.mutex};
return texture_cache.ShouldWaitAsyncFlushes() || buffer_cache.ShouldWaitAsyncFlushes() ||
query_cache.ShouldWaitAsyncFlushes();
}
bool ShouldFlush() const {
std::scoped_lock lock{buffer_cache.mutex, texture_cache.mutex};
return texture_cache.HasUncommittedFlushes() || buffer_cache.HasUncommittedFlushes() ||
query_cache.HasUncommittedFlushes();
}
void PopAsyncFlushes() {
std::scoped_lock lock{buffer_cache.mutex, texture_cache.mutex};
texture_cache.PopAsyncFlushes();
buffer_cache.PopAsyncFlushes();
query_cache.PopAsyncFlushes();
}
void CommitAsyncFlushes() {
std::scoped_lock lock{buffer_cache.mutex, texture_cache.mutex};
texture_cache.CommitAsyncFlushes();
buffer_cache.CommitAsyncFlushes();
query_cache.CommitAsyncFlushes();
}
void PopFence() {
delayed_destruction_ring.Push(std::move(fences.front()));
fences.pop();
}
std::queue<TFence> fences;
DelayedDestructionRing<TFence, 6> delayed_destruction_ring;
};
} // namespace VideoCommon
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