Initial support for Qt using Kernel Mode-setting (KMS)

This platform plugin supports fullscreen OpenGLES2 windows on devices
that support Kernel Mode-setting.

Change-Id: I7d4077319654c13851f0ff7ec0228b7b13936382
Reviewed-on: http://codereview.qt.nokia.com/2516
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Jørgen Lind <jorgen.lind@nokia.com>

1 files changed, 163 insertions, 0 deletions

diff --git a/src/plugins/platforms/kms/qkmsdevice.cpp b/src/plugins/platforms/kms/qkmsdevice.cpp
new file mode 100644
index 0000000000..e0fac5611d
--- /dev/null
+++ b/src/plugins/platforms/kms/qkmsdevice.cpp
@@ -0,0 +1,163 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+//#include <QDebug>
+#include "qkmsscreen.h"
+#include "qkmsdevice.h"
+
+#include "qkmsintegration.h"
+
+#include <QtCore/QSocketNotifier>
+#include <QtCore/private/qcore_unix_p.h>
+
+QT_BEGIN_NAMESPACE
+
+QKmsDevice::QKmsDevice(const QString &path, QKmsIntegration *parent) :
+    QObject(0), m_integration(parent)
+{
+    m_fd = QT_OPEN(path.toAscii().constData(), O_RDWR);
+    if (m_fd < 0) {
+        qWarning("Could not open %s.", path.toAscii().constData());
+        qFatal("No DRM display device");
+    }
+
+    m_graphicsBufferManager = gbm_create_device(m_fd);
+    m_eglDisplay = eglGetDisplay(m_graphicsBufferManager);
+
+    if (m_eglDisplay == EGL_NO_DISPLAY) {
+        qWarning("Could not open EGL display");
+        qFatal("EGL error");
+    }
+
+    EGLint major;
+    EGLint minor;
+    if (!eglInitialize(m_eglDisplay, &major, &minor)) {
+        qWarning("Could not initialize EGL display");
+        qFatal("EGL error");
+    }
+
+    QString extensions = eglQueryString(m_eglDisplay, EGL_EXTENSIONS);
+    if (!extensions.contains(QString::fromLatin1("EGL_KHR_surfaceless_opengl"))) {
+        qFatal("EGL_KHR_surfaceless_opengl extension not available");
+    }
+
+    //Initialize EGLContext
+    static EGLint contextAttribs[] = {
+        EGL_CONTEXT_CLIENT_VERSION, 2,
+        EGL_NONE
+    };
+
+    eglBindAPI(EGL_OPENGL_ES_API);
+    m_eglContext = eglCreateContext(m_eglDisplay, 0, 0, contextAttribs);
+    if (m_eglContext == EGL_NO_CONTEXT) {
+        qWarning("Could not create the EGL context.");
+        eglTerminate(m_eglDisplay);
+        qFatal("EGL error");
+    }
+
+    createScreens();
+
+    QSocketNotifier *notifier = new QSocketNotifier(m_fd, QSocketNotifier::Read, this);
+    connect(notifier, SIGNAL(activated(int)), this, SLOT(handlePageFlipCompleted()));
+}
+
+QKmsDevice::~QKmsDevice()
+{
+    if (m_eglContext != EGL_NO_CONTEXT) {
+        eglDestroyContext(m_eglDisplay, m_eglContext);
+        m_eglContext = EGL_NO_CONTEXT;
+    }
+}
+
+void QKmsDevice::createScreens()
+{
+    drmModeRes *resources = 0;
+    resources = drmModeGetResources(m_fd);
+    if (!resources)
+        qFatal("drmModeGetResources failed");
+
+    //Iterate connectors and create screens on each one active
+    for (int i = 0; i < resources->count_connectors; i++) {
+        drmModeConnector *connector = 0;
+        connector = drmModeGetConnector(m_fd, resources->connectors[i]);
+        if (connector && connector->connection == DRM_MODE_CONNECTED) {
+            m_integration->addScreen(new QKmsScreen(this, connector->connector_id));
+        }
+        drmModeFreeConnector(connector);
+    }
+    drmModeFreeResources(resources);
+}
+
+void QKmsDevice::handlePageFlipCompleted()
+{
+    //qDebug() << "Display signal recieved";
+    drmEventContext eventContext;
+
+    memset(&eventContext, 0, sizeof eventContext);
+    eventContext.version = DRM_EVENT_CONTEXT_VERSION;
+    eventContext.page_flip_handler = QKmsDevice::pageFlipHandler;
+    drmHandleEvent(m_fd, &eventContext);
+
+}
+
+void QKmsDevice::pageFlipHandler(int fd, unsigned int frame, unsigned int sec, unsigned int usec, void *data)
+{
+    Q_UNUSED(fd)
+    Q_UNUSED(frame)
+    Q_UNUSED(sec)
+    Q_UNUSED(usec)
+    static unsigned int previousTime = 0;
+
+    unsigned int currentTime = sec * 1000000 + usec;
+    unsigned int refreshTime = 0;
+//    qDebug() << "fd: " << fd << " frame: " << frame << " sec: "
+//             << sec << " usec: " << usec << " data: " << data
+//             << "msecs" << sec * 1000 + usec / 1000;
+    QKmsScreen *screen = static_cast<QKmsScreen *>(data);
+
+    if (previousTime == 0)
+        refreshTime = 16000;
+    else
+        refreshTime = currentTime - previousTime;
+
+    screen->setFlipReady(refreshTime);
+}
+
+QT_END_NAMESPACE