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/*
* Copyright 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <android-base/thread_annotations.h>
#include <condition_variable>
#include <mutex>
#include <queue>
#include <thread>
#include "renderengine/RenderEngine.h"
namespace android {
namespace renderengine {
namespace threaded {
using CreateInstanceFactory = std::function<std::unique_ptr<renderengine::RenderEngine>()>;
/**
* This class extends a basic RenderEngine class. It contains a thread. Each time a function of
* this class is called, we create a lambda function that is put on a queue. The main thread then
* executes the functions in order.
*/
class RenderEngineThreaded : public RenderEngine {
public:
static std::unique_ptr<RenderEngineThreaded> create(CreateInstanceFactory factory);
RenderEngineThreaded(CreateInstanceFactory factory);
~RenderEngineThreaded() override;
std::future<void> primeCache(bool shouldPrimeUltraHDR) override;
void dump(std::string& result) override;
size_t getMaxTextureSize() const override;
size_t getMaxViewportDims() const override;
bool supportsProtectedContent() const override;
void cleanupPostRender() override;
ftl::Future<FenceResult> drawLayers(const DisplaySettings& display,
const std::vector<LayerSettings>& layers,
const std::shared_ptr<ExternalTexture>& buffer,
base::unique_fd&& bufferFence) override;
int getContextPriority() override;
bool supportsBackgroundBlur() override;
void onActiveDisplaySizeChanged(ui::Size size) override;
std::optional<pid_t> getRenderEngineTid() const override;
void setEnableTracing(bool tracingEnabled) override;
protected:
void mapExternalTextureBuffer(const sp<GraphicBuffer>& buffer, bool isRenderable) override;
void unmapExternalTextureBuffer(sp<GraphicBuffer>&& buffer) override;
bool canSkipPostRenderCleanup() const override;
void drawLayersInternal(const std::shared_ptr<std::promise<FenceResult>>&& resultPromise,
const DisplaySettings& display,
const std::vector<LayerSettings>& layers,
const std::shared_ptr<ExternalTexture>& buffer,
base::unique_fd&& bufferFence) override;
private:
void threadMain(CreateInstanceFactory factory);
void waitUntilInitialized() const;
static status_t setSchedFifo(bool enabled);
// No-op. This method is only called on leaf implementations of RenderEngine.
void useProtectedContext(bool) override {}
/* ------------------------------------------------------------------------
* Threading
*/
const char* const mThreadName = "RenderEngine";
// Protects the creation and destruction of mThread.
mutable std::mutex mThreadMutex;
std::thread mThread GUARDED_BY(mThreadMutex);
std::atomic<bool> mRunning = true;
std::atomic<bool> mNeedsPostRenderCleanup = false;
using Work = std::function<void(renderengine::RenderEngine&)>;
mutable std::queue<Work> mFunctionCalls GUARDED_BY(mThreadMutex);
mutable std::condition_variable mCondition;
// Used to allow select thread safe methods to be accessed without requiring the
// method to be invoked on the RenderEngine thread
std::atomic_bool mIsInitialized = false;
mutable std::mutex mInitializedMutex;
mutable std::condition_variable mInitializedCondition;
/* ------------------------------------------------------------------------
* Render Engine
*/
std::unique_ptr<renderengine::RenderEngine> mRenderEngine;
};
} // namespace threaded
} // namespace renderengine
} // namespace android
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