80 lines
2.7 KiB
C++
80 lines
2.7 KiB
C++
// 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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// Consider this file an implementation detail. None of this is part of the
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// public API.
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#ifndef MEDIAPIPE_GPU_GL_TEXTURE_BUFFER_POOL_H_
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#define MEDIAPIPE_GPU_GL_TEXTURE_BUFFER_POOL_H_
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#include <utility>
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#include <vector>
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#include "absl/synchronization/mutex.h"
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#include "mediapipe/gpu/gl_texture_buffer.h"
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namespace mediapipe {
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class GlTextureBufferPool
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: public std::enable_shared_from_this<GlTextureBufferPool> {
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public:
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// Creates a pool. This pool will manage buffers of the specified dimensions,
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// and will keep keep_count buffers around for reuse.
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// We enforce creation as a shared_ptr so that we can use a weak reference in
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// the buffers' deleters.
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static std::shared_ptr<GlTextureBufferPool> Create(int width, int height,
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GpuBufferFormat format,
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int keep_count) {
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return std::shared_ptr<GlTextureBufferPool>(
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new GlTextureBufferPool(width, height, format, keep_count));
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}
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// Obtains a buffers. May either be reused or created anew.
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// A GlContext must be current when this is called.
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GlTextureBufferSharedPtr GetBuffer();
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int width() const { return width_; }
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int height() const { return height_; }
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GpuBufferFormat format() const { return format_; }
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// This method is meant for testing.
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std::pair<int, int> GetInUseAndAvailableCounts();
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private:
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GlTextureBufferPool(int width, int height, GpuBufferFormat format,
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int keep_count);
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// Return a buffer to the pool.
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void Return(std::unique_ptr<GlTextureBuffer> buf);
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// If the total number of buffers is greater than keep_count, destroys any
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// surplus buffers that are no longer in use.
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void TrimAvailable(std::vector<std::unique_ptr<GlTextureBuffer>>* trimmed)
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ABSL_EXCLUSIVE_LOCKS_REQUIRED(mutex_);
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const int width_;
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const int height_;
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const GpuBufferFormat format_;
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const int keep_count_;
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absl::Mutex mutex_;
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int in_use_count_ ABSL_GUARDED_BY(mutex_) = 0;
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std::vector<std::unique_ptr<GlTextureBuffer>> available_
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ABSL_GUARDED_BY(mutex_);
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};
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} // namespace mediapipe
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#endif // MEDIAPIPE_GPU_GL_TEXTURE_BUFFER_POOL_H_
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