77 lines
2.5 KiB
C++
77 lines
2.5 KiB
C++
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// Copyright 2019 The MediaPipe Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "mediapipe/gpu/gl_texture_buffer_pool.h"
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#include "absl/synchronization/mutex.h"
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namespace mediapipe {
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GlTextureBufferPool::GlTextureBufferPool(int width, int height,
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GpuBufferFormat format, int keep_count)
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: width_(width),
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height_(height),
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format_(format),
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keep_count_(keep_count) {}
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GlTextureBufferSharedPtr GlTextureBufferPool::GetBuffer() {
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absl::MutexLock lock(&mutex_);
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std::unique_ptr<GlTextureBuffer> buffer;
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if (available_.empty()) {
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buffer = GlTextureBuffer::Create(width_, height_, format_);
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if (!buffer) return nullptr;
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} else {
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buffer = std::move(available_.back());
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available_.pop_back();
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buffer->Reuse();
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}
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++in_use_count_;
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// Return a shared_ptr with a custom deleter that adds the buffer back
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// to our available list.
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std::weak_ptr<GlTextureBufferPool> weak_pool(shared_from_this());
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return std::shared_ptr<GlTextureBuffer>(buffer.release(),
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[weak_pool](GlTextureBuffer* buf) {
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auto pool = weak_pool.lock();
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if (pool) {
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pool->Return(buf);
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} else {
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delete buf;
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}
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});
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}
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std::pair<int, int> GlTextureBufferPool::GetInUseAndAvailableCounts() {
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absl::MutexLock lock(&mutex_);
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return {in_use_count_, available_.size()};
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}
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void GlTextureBufferPool::Return(GlTextureBuffer* buf) {
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absl::MutexLock lock(&mutex_);
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--in_use_count_;
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available_.emplace_back(buf);
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TrimAvailable();
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}
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void GlTextureBufferPool::TrimAvailable() {
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int keep = std::max(keep_count_ - in_use_count_, 0);
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if (available_.size() > keep) {
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available_.resize(keep);
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}
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}
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} // namespace mediapipe
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