moved things around and started rewriting render backend

app/threading/threadpool.h

@@ -0,0 +1,94 @@
+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2019 Olive Team
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+***/
+
+#ifndef THREADPOOL_H
+#define THREADPOOL_H
+
+#include <QThread>
+
+#include "threading/threadticket.h"
+
+OLIVE_NAMESPACE_ENTER
+
+class ThreadPoolThread;
+
+class ThreadPool : public QObject
+{
+  Q_OBJECT
+public:
+  ThreadPool(QThread::Priority priority = QThread::InheritPriority, int threads = 0, QObject* parent = nullptr);
+
+  virtual ~ThreadPool() override;
+
+  RenderTicketPtr Queue();
+
+  virtual void RunTicket(RenderTicketPtr ticket) const = 0;
+
+public slots:
+  void AddTicket(OLIVE_NAMESPACE::RenderTicketPtr ticket, bool prioritize = false);
+
+private:
+  void RunNext();
+
+  QVector<ThreadPoolThread*> all_threads_;
+
+  std::list<ThreadPoolThread*> available_threads_;
+
+  std::list<RenderTicketPtr> ticket_queue_;
+
+private slots:
+  void ThreadDone();
+
+};
+
+class ThreadPoolThread : public QThread
+{
+  Q_OBJECT
+public:
+  ThreadPoolThread(ThreadPool* parent);
+
+  virtual ~ThreadPoolThread() override;
+
+  void RunTicket(RenderTicketPtr ticket);
+
+  void Cancel();
+
+protected:
+  virtual void run() override;
+
+signals:
+  void Done();
+
+private:
+  ThreadPool* pool_;
+
+  RenderTicketPtr ticket_;
+
+  QMutex mutex_;
+
+  QWaitCondition wait_cond_;
+
+  QAtomicInt cancelled_;
+
+};
+
+OLIVE_NAMESPACE_EXIT
+
+#endif // THREADPOOL_H