mirror of
https://github.com/encounter/engine.git
synced 2026-03-30 11:09:55 -07:00
Kaushik Iska
971a639151
After pre-roll we know if there have been any mutations made to the IOS embedded UIViews. If there are any mutations and the thread configuration is such chat the mutations will be committed on an illegal thread (GPU thread), we merge the threads and keep them merged until the lease expires. The lease is currently set to expire after 10 frames of no mutations. If there are any mutations in the interim we extend the lease. TaskRunnerMerger will ultimately be responsible for enforcing the correct thread configurations. This configuration will be inactive even after this change since still use the same thread when we create the iOS engine. That is slated to change in the coming PRs.
75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#define FML_USED_ON_EMBEDDER
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#include "flutter/fml/gpu_thread_merger.h"
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#include "flutter/fml/message_loop_impl.h"
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namespace fml {
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const int GpuThreadMerger::kLeaseNotSet = -1;
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GpuThreadMerger::GpuThreadMerger(fml::TaskQueueId platform_queue_id,
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fml::TaskQueueId gpu_queue_id)
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: platform_queue_id_(platform_queue_id),
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gpu_queue_id_(gpu_queue_id),
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task_queues_(fml::MessageLoopTaskQueues::GetInstance()),
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lease_term_(kLeaseNotSet) {
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is_merged_ = task_queues_->Owns(platform_queue_id_, gpu_queue_id_);
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}
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void GpuThreadMerger::MergeWithLease(size_t lease_term) {
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FML_DCHECK(lease_term > 0) << "lease_term should be positive.";
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if (!is_merged_) {
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is_merged_ = task_queues_->Merge(platform_queue_id_, gpu_queue_id_);
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lease_term_ = lease_term;
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}
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}
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bool GpuThreadMerger::IsOnRasterizingThread() {
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const auto current_queue_id = MessageLoop::GetCurrentTaskQueueId();
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if (is_merged_) {
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return current_queue_id == platform_queue_id_;
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} else {
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return current_queue_id == gpu_queue_id_;
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}
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}
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void GpuThreadMerger::ExtendLeaseTo(size_t lease_term) {
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FML_DCHECK(lease_term > 0) << "lease_term should be positive.";
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if (lease_term_ != kLeaseNotSet && (int)lease_term > lease_term_) {
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lease_term_ = lease_term;
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}
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}
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bool GpuThreadMerger::IsMerged() const {
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return is_merged_;
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}
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GpuThreadStatus GpuThreadMerger::DecrementLease() {
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if (!is_merged_) {
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return GpuThreadStatus::kRemainsUnmerged;
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}
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// we haven't been set to merge.
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if (lease_term_ == kLeaseNotSet) {
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return GpuThreadStatus::kRemainsUnmerged;
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}
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FML_DCHECK(lease_term_ > 0)
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<< "lease_term should always be positive when merged.";
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lease_term_--;
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if (lease_term_ == 0) {
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bool success = task_queues_->Unmerge(platform_queue_id_);
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FML_CHECK(success) << "Unable to un-merge the GPU and platform threads.";
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is_merged_ = false;
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return GpuThreadStatus::kUnmergedNow;
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}
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return GpuThreadStatus::kRemainsMerged;
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}
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} // namespace fml
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