/*
* Copyright (C) 2024 Amlogic Corporation.
*
* 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.
*/

#include <sys/prctl.h>

#include "DisplayThread.h"
#include "DispAdptLog.h"

DisplayThread::DisplayThread(MesonDisplay *display)
{
    int32_t ret;

    mDisplay = display;
    mExit = false;
    needRefresh = false;
    snprintf(mName, 64, "DisplayThread-%d", mDisplay->getDisplayId());

    ret = pthread_create(&mThread, NULL, DisplayThreadMain, (void *)this);
    if (ret) {
        DISPLAY_LOGE("%s %s, failed to create VideoTunnel CmdThread: %s",
            mName, __func__, strerror(ret));
    }
}

DisplayThread::~DisplayThread()
{
    mExit = true;
    pthread_join(mThread, NULL);
}

void DisplayThread::onVsync(int64_t timestamp, uint32_t vsyncPeriodNanos)
{
    std::unique_lock<std::mutex> stateLock(mMutex);
    needRefresh = true;
    stateLock.unlock();
    mCondition.notify_all();
}

void DisplayThread::onFrameAvailableForGameMode()
{
    std::unique_lock<std::mutex> stateLock(mMutex);
    needRefresh = true;
    stateLock.unlock();
    mCondition.notify_all();
}

void* DisplayThread::DisplayThreadMain(void *data) {
    DisplayThread* pThis = (DisplayThread*)data;

    prctl(PR_SET_NAME, "displayThread");
    // set videotunnel thread to SCHED_FIFO to minimize jitter
    struct sched_param param = {0};
    param.sched_priority = sched_get_priority_max(SCHED_FIFO);
    if (sched_setscheduler(0, SCHED_FIFO, &param) != 0) {
        DISPLAY_LOGE("%s %s, Couldn't set SCHED_FIFO for videotunnelthread",
            pThis->mName, __func__);
    }

    while (true) {

        if (pThis->mExit) {
            DISPLAY_LOGD("%s %s, VtDisplayThread exit video tunnel loop",
                pThis->mName, __func__);
            pthread_exit(0);
            return NULL;
        }

        pThis->handleDisplay();
    }
}

void DisplayThread::handleDisplay()
{
    int32_t outPresentFence = -1;
    long long time;

    std::unique_lock<std::mutex> stateLock(mMutex);
    while (!needRefresh) {
        mCondition.wait(stateLock);
    }
    needRefresh = false;
    stateLock.unlock();

    // run display
    do {
        mDisplay->setLayersPresentTime();
        if (mDisplay->handleDisplayConnection()) {
            time = DispAdptGetCurrentTime();
            mDisplay->validateDisplay(NULL, NULL);
            mDisplay->presentDisplay(&outPresentFence);
            mDisplay->setVsyncDelayLatency(DispAdptGetCurrentTime() - time);
            if (outPresentFence >= 0)
                close(outPresentFence);
        }
        mDisplay->releaseLayers();
    } while (mDisplay->newGameBuffer());
}