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/****************************************************************************
**
** Copyright (C) 2017 Klaralvdalens Datakonsult AB (KDAB).
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "commandthread_p.h"
#include <Qt3DRender/private/glcommands_p.h>
#include <Qt3DRender/private/offscreensurfacehelper_p.h>
#include <Qt3DRender/private/graphicscontext_p.h>
#include <Qt3DRender/private/shadercache_p.h>
#include <QOpenGLContext>
#include <QOffscreenSurface>
#include <QDebug>
QT_BEGIN_NAMESPACE
namespace Qt3DRender {
namespace Render {
CommandThread::CommandThread(Renderer *renderer)
: QThread()
, m_renderer(renderer)
, m_waitForStartSemaphore(0)
, m_initializedSemaphore(0)
, m_commandRequestedSemaphore(0)
, m_commandExecutionSemaphore(0)
, m_mainContext(nullptr)
, m_shaderCache(nullptr)
, m_offsreenSurfaceHelper(nullptr)
, m_currentCommand(nullptr)
, m_running(0)
{
}
CommandThread::~CommandThread()
{
Q_ASSERT(!isRunning());
}
void CommandThread::setShaderCache(ShaderCache *shaderCache)
{
m_shaderCache = shaderCache;
}
// Called by RenderThread or MainThread (Scene3d)
void CommandThread::initialize(QOpenGLContext *mainContext, OffscreenSurfaceHelper *offsreenSurfaceHelper)
{
// Start the thread
start();
// Wait for thread to be started
m_waitForStartSemaphore.acquire();
m_mainContext = mainContext;
m_offsreenSurfaceHelper = offsreenSurfaceHelper;
Q_ASSERT(m_mainContext && offsreenSurfaceHelper);
// Initialize shared context and resources for the thread. This must be
// done here since some platforms do not allow context sharing to be set up
// with contexts created on different threads. (Windows with WGL, in
// particular; resource sharing works fine later on, what matters is the
// thread the wglShareLists call is made on)
m_localContext.reset(new QOpenGLContext());
m_localContext->setFormat(m_mainContext->format());
m_localContext->setShareContext(m_mainContext);
if (!m_localContext->create())
qWarning("CommandThread: Failed to create local context");
m_localContext->moveToThread(this);
m_running.fetchAndStoreOrdered(1);
// Allow thread to proceed
m_initializedSemaphore.release();
}
// Called by RenderThread or MainThread (Scene3D)
void CommandThread::shutdown()
{
m_running.fetchAndStoreOrdered(0);
// Unblock thread
m_commandRequestedSemaphore.release(1);
// Wait for thread to exit
wait();
// Reset semaphores (in case we ever want to restart)
m_waitForStartSemaphore.acquire(m_waitForStartSemaphore.available());
m_initializedSemaphore.acquire(m_initializedSemaphore.available());
m_commandRequestedSemaphore.acquire(m_commandRequestedSemaphore.available());
m_commandExecutionSemaphore.acquire(m_commandExecutionSemaphore.available());
m_localContext.reset();
}
// Any thread can call this, this is a blocking command
void CommandThread::executeCommand(GLCommand *command)
{
if (!isRunning())
return;
// We lock to prevent any other call to executeCommand to be executed
// before we have received the result of our command
m_blockingCallerMutex.lock();
// Store command to be executed
m_currentCommand = command;
// Allow thread to proceed and execute command
m_commandRequestedSemaphore.release();
// Wait for thread to be done
m_commandExecutionSemaphore.acquire();
// Reset command
m_currentCommand = nullptr;
// Unlock blocking semaphore so that other calls to executeCommand
// can proceed
m_blockingCallerMutex.unlock();
}
void CommandThread::run()
{
// Allow initialize to proceed
m_waitForStartSemaphore.release();
// Wait for initialize to be completed
m_initializedSemaphore.acquire();
Q_ASSERT(m_mainContext && m_shaderCache);
// Initialize GraphicsContext
m_graphicsContext.reset(new GraphicsContext());
m_graphicsContext->setShaderCache(m_shaderCache);
m_graphicsContext->setOpenGLContext(m_localContext.data());
bool initialized = false;
while (true) {
// Wait for command
m_commandRequestedSemaphore.acquire();
// Are we still running?
if (!m_running.load()) {
m_graphicsContext->doneCurrent();
// to prevent executeCommand being locked
m_commandExecutionSemaphore.release();
break;
}
if (Q_UNLIKELY(!initialized)) {
QOffscreenSurface *offscreenSurface = m_offsreenSurfaceHelper->offscreenSurface();
Q_ASSERT(offscreenSurface);
m_graphicsContext->makeCurrent(offscreenSurface);
initialized = true;
}
m_currentCommand->execute(m_renderer, m_graphicsContext.data());
// Allow caller to proceed as we are done with the command
m_commandExecutionSemaphore.release();
}
}
} // Render
} // Qt3DRender
QT_END_NAMESPACE
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