/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the QtGui module of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include <QtGui/qpaintdevice.h>+
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#include <QtGui/qpixmap.h>+
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#include <QtGui/qwidget.h>+
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#include <QtCore/qdebug.h>+
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#include "qegl_p.h"+
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+
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QT_BEGIN_NAMESPACE+
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+
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// Current GL and VG contexts.  These are used to determine if+
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// we can avoid an eglMakeCurrent() after a call to lazyDoneCurrent().+
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// If a background thread modifies the value, the worst that will+
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// happen is a redundant eglMakeCurrent() in the foreground thread.+
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static QEglContext * volatile currentGLContext = 0;+
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static QEglContext * volatile currentVGContext = 0;+
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+
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EGLDisplay QEglContext::dpy = EGL_NO_DISPLAY;+
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+
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QEglContext::QEglContext()+
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    : apiType(QEgl::OpenGL)+
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    , ctx(EGL_NO_CONTEXT)+
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    , cfg(0)+
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    , currentSurface(EGL_NO_SURFACE)+
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    , current(false)+
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    , ownsContext(true)+
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    , sharing(false)+
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{+
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}+
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+
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QEglContext::~QEglContext()+
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{+
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    destroyContext();+
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+
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    if (currentGLContext == this)+
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        currentGLContext = 0;+
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    if (currentVGContext == this)+
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        currentVGContext = 0;+
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}+
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+
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bool QEglContext::isValid() const+
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{+
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    return (ctx != EGL_NO_CONTEXT);+
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}+
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+
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bool QEglContext::isCurrent() const+
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{+
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    return current;+
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}+
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+
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// Choose a configuration that matches "properties".+
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bool QEglContext::chooseConfig+
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        (const QEglProperties& properties, QEgl::PixelFormatMatch match)+
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{+
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    QEglProperties props(properties);+
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    do {+
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        // Get the number of matching configurations for this set of properties.+
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        EGLint matching = 0;+
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        if (!eglChooseConfig(display(), props.properties(), 0, 0, &matching) || !matching)+
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            continue;+
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+
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        // If we want the best pixel format, then return the first+
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        // matching configuration.+
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        if (match == QEgl::BestPixelFormat) {+
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            eglChooseConfig(display(), props.properties(), &cfg, 1, &matching);+
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            if (matching < 1)+
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                continue;+
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            return true;+
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        }+
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+
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        // Fetch all of the matching configurations and find the+
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        // first that matches the pixel format we wanted.+
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        EGLint size = matching;+
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        EGLConfig *configs = new EGLConfig [size];+
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        eglChooseConfig(display(), props.properties(), configs, size, &matching);+
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        for (EGLint index = 0; index < size; ++index) {+
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            EGLint red, green, blue, alpha;+
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            eglGetConfigAttrib(display(), configs[index], EGL_RED_SIZE, &red);+
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            eglGetConfigAttrib(display(), configs[index], EGL_GREEN_SIZE, &green);+
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            eglGetConfigAttrib(display(), configs[index], EGL_BLUE_SIZE, &blue);+
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            eglGetConfigAttrib(display(), configs[index], EGL_ALPHA_SIZE, &alpha);+
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            if (red == props.value(EGL_RED_SIZE) &&+
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                    green == props.value(EGL_GREEN_SIZE) &&+
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                    blue == props.value(EGL_BLUE_SIZE) &&+
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                    (props.value(EGL_ALPHA_SIZE) == 0 ||+
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                     alpha == props.value(EGL_ALPHA_SIZE))) {+
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                cfg = configs[index];+
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                delete [] configs;+
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                return true;+
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            }+
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        }+
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        delete [] configs;+
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    } while (props.reduceConfiguration());+
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+
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#ifdef EGL_BIND_TO_TEXTURE_RGBA+
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    // Don't report an error just yet if we failed to get a pbuffer+
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    // configuration with texture rendering.  Only report failure if+
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    // we cannot get any pbuffer configurations at all.+
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    if (props.value(EGL_BIND_TO_TEXTURE_RGBA) == EGL_DONT_CARE &&+
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        props.value(EGL_BIND_TO_TEXTURE_RGB) == EGL_DONT_CARE)+
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#endif+
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    {+
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        qWarning() << "QEglContext::chooseConfig(): Could not find a suitable EGL configuration";+
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        qWarning() << "Requested:" << props.toString();+
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        qWarning() << "Available:";+
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        dumpAllConfigs();+
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    }+
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    return false;+
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}+
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+
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// Create the EGLContext.+
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bool QEglContext::createContext(QEglContext *shareContext, const QEglProperties *properties)+
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{+
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    // We need to select the correct API before calling eglCreateContext().+
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#ifdef EGL_OPENGL_ES_API+
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    if (apiType == QEgl::OpenGL)+
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        eglBindAPI(EGL_OPENGL_ES_API);+
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#endif+
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#ifdef EGL_OPENVG_API+
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    if (apiType == QEgl::OpenVG)+
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        eglBindAPI(EGL_OPENVG_API);+
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#endif+
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+
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    // Create a new context for the configuration.+
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    QEglProperties contextProps;+
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    if (properties)+
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        contextProps = *properties;+
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#if defined(QT_OPENGL_ES_2)+
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    if (apiType == QEgl::OpenGL)+
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        contextProps.setValue(EGL_CONTEXT_CLIENT_VERSION, 2);+
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#endif+
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    sharing = false;+
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    if (shareContext && shareContext->ctx == EGL_NO_CONTEXT)+
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        shareContext = 0;+
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    if (shareContext) {+
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        ctx = eglCreateContext(display(), cfg, shareContext->ctx, contextProps.properties());+
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        if (ctx == EGL_NO_CONTEXT) {+
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            qWarning() << "QEglContext::createContext(): Could not share context:" << errorString(eglGetError());+
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            shareContext = 0;+
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        } else {+
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            sharing = true;+
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        }+
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    }+
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    if (ctx == EGL_NO_CONTEXT) {+
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        ctx = eglCreateContext(display(), cfg, 0, contextProps.properties());+
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        if (ctx == EGL_NO_CONTEXT) {+
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            qWarning() << "QEglContext::createContext(): Unable to create EGL context:" << errorString(eglGetError());+
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            return false;+
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        }+
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    }+
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    return true;+
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}+
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+
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// Destroy an EGL surface object.  If it was current on this context+
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// then call doneCurrent() for it first.+
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void QEglContext::destroySurface(EGLSurface surface)+
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{+
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    if (surface != EGL_NO_SURFACE) {+
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        if (surface == currentSurface)+
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            doneCurrent();+
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        eglDestroySurface(display(), surface);+
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    }+
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}+
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+
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// Destroy the context.  Note: this does not destroy the surface.+
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void QEglContext::destroyContext()+
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{+
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    if (ctx != EGL_NO_CONTEXT && ownsContext)+
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        eglDestroyContext(display(), ctx);+
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    ctx = EGL_NO_CONTEXT;+
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    cfg = 0;+
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}+
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+
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bool QEglContext::makeCurrent(EGLSurface surface)+
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{+
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    if (ctx == EGL_NO_CONTEXT) {+
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        qWarning() << "QEglContext::makeCurrent(): Cannot make invalid context current";+
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        return false;+
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    }+
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+
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    // If lazyDoneCurrent() was called on the surface, then we may be able+
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    // to assume that it is still current within the thread.+
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    if (surface == currentSurface && currentContext(apiType) == this) {+
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        current = true;+
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        return true;+
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    }+
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+
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    current = true;+
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    currentSurface = surface;+
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    setCurrentContext(apiType, this);+
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+
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    // Force the right API to be bound before making the context current.+
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    // The EGL implementation should be able to figure this out from ctx,+
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    // but some systems require the API to be explicitly set anyway.+
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#ifdef EGL_OPENGL_ES_API+
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    if (apiType == QEgl::OpenGL)+
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        eglBindAPI(EGL_OPENGL_ES_API);+
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#endif+
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#ifdef EGL_OPENVG_API+
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    if (apiType == QEgl::OpenVG)+
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        eglBindAPI(EGL_OPENVG_API);+
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#endif+
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+
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    bool ok = eglMakeCurrent(display(), surface, surface, ctx);+
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    if (!ok)+
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        qWarning() << "QEglContext::makeCurrent():" << errorString(eglGetError());+
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    return ok;+
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}+
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+
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bool QEglContext::doneCurrent()+
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{+
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    // If the context is invalid, we assume that an error was reported+
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    // when makeCurrent() was called.+
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    if (ctx == EGL_NO_CONTEXT)+
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        return false;+
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+
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    current = false;+
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    currentSurface = EGL_NO_SURFACE;+
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    setCurrentContext(apiType, 0);+
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+
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    // We need to select the correct API before calling eglMakeCurrent()+
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    // with EGL_NO_CONTEXT because threads can have both OpenGL and OpenVG+
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    // contexts active at the same time.+
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#ifdef EGL_OPENGL_ES_API+
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    if (apiType == QEgl::OpenGL)+
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        eglBindAPI(EGL_OPENGL_ES_API);+
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#endif+
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#ifdef EGL_OPENVG_API+
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    if (apiType == QEgl::OpenVG)+
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        eglBindAPI(EGL_OPENVG_API);+
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#endif+
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+
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    bool ok = eglMakeCurrent(display(), EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);+
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    if (!ok)+
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        qWarning() << "QEglContext::doneCurrent():" << errorString(eglGetError());+
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    return ok;+
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}+
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+
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// Act as though doneCurrent() was called, but keep the context+
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// and the surface active for the moment.  This allows makeCurrent()+
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// to skip a call to eglMakeCurrent() if we are using the same+
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// surface as the last set of painting operations.  We leave the+
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// currentContext() pointer as-is for now.+
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bool QEglContext::lazyDoneCurrent()+
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{+
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    current = false;+
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    return true;+
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}+
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+
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bool QEglContext::swapBuffers(EGLSurface surface)+
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{+
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    if(ctx == EGL_NO_CONTEXT)+
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        return false;+
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+
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    bool ok = eglSwapBuffers(display(), surface);+
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    if (!ok)+
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        qWarning() << "QEglContext::swapBuffers():" << errorString(eglGetError());+
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    return ok;+
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}+
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+
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// Wait for native rendering operations to complete before starting+
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// to use OpenGL/OpenVG operations.+
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void QEglContext::waitNative()+
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{+
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#ifdef EGL_CORE_NATIVE_ENGINE+
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    eglWaitNative(EGL_CORE_NATIVE_ENGINE);+
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#endif+
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}+
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+
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// Wait for client OpenGL/OpenVG operations to complete before+
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// using native rendering operations.+
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void QEglContext::waitClient()+
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{+
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#ifdef EGL_OPENGL_ES_API+
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    if (apiType == QEgl::OpenGL) {+
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        eglBindAPI(EGL_OPENGL_ES_API);+
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        eglWaitClient();+
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    }+
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#else+
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    if (apiType == QEgl::OpenGL)+
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        eglWaitGL();+
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#endif+
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#ifdef EGL_OPENVG_API+
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    if (apiType == QEgl::OpenVG) {+
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        eglBindAPI(EGL_OPENVG_API);+
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        eglWaitClient();+
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    }+
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#endif+
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}+
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+
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// Query the value of a configuration attribute.+
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bool QEglContext::configAttrib(int name, EGLint *value) const+
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{+
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    return eglGetConfigAttrib(display(), cfg, name, value);+
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}+
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+
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// Retrieve all of the properties on "cfg".  If zero, return+
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// the context's configuration.+
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QEglProperties QEglContext::configProperties(EGLConfig cfg) const+
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{+
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    if (!cfg)+
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        cfg = config();+
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    QEglProperties props;+
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    for (int name = 0x3020; name <= 0x304F; ++name) {+
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        EGLint value;+
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        if (name != EGL_NONE && eglGetConfigAttrib(display(), cfg, name, &value))+
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            props.setValue(name, value);+
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    }+
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    eglGetError();  // Clear the error state.+
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    return props;+
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}+
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+
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EGLDisplay QEglContext::display()+
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{+
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    static bool openedDisplay = false;+
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+
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    if (!openedDisplay) {+
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        dpy = eglGetDisplay(nativeDisplay());+
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        openedDisplay = true;+
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        if (dpy == EGL_NO_DISPLAY) {+
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            qWarning("QEglContext::display(): Falling back to EGL_DEFAULT_DISPLAY");+
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            dpy = eglGetDisplay(EGLNativeDisplayType(EGL_DEFAULT_DISPLAY));+
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        }+
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        if (dpy == EGL_NO_DISPLAY) {+
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            qWarning("QEglContext::display(): Can't even open the default display");+
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            return EGL_NO_DISPLAY;+
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        }+
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+
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        if (!eglInitialize(dpy, NULL, NULL)) {+
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            qWarning() << "QEglContext::display(): Cannot initialize EGL display:" << errorString(eglGetError());+
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            return EGL_NO_DISPLAY;+
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        }+
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    }+
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+
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    return dpy;+
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}+
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+
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#if !defined(Q_WS_X11) && !defined(Q_WS_WINCE) // WinCE & X11 implement this properly+
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EGLNativeDisplayType QEglContext::nativeDisplay()+
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{+
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    return EGL_DEFAULT_DISPLAY;+
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}+
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#endif+
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+
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// Return the error string associated with a specific code.+
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QString QEglContext::errorString(EGLint code)+
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{+
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    static const char * const errors[] = {+
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        "Success (0x3000)",                 // No tr+
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        "Not initialized (0x3001)",         // No tr+
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        "Bad access (0x3002)",              // No tr+
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        "Bad alloc (0x3003)",               // No tr+
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        "Bad attribute (0x3004)",           // No tr+
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        "Bad config (0x3005)",              // No tr+
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        "Bad context (0x3006)",             // No tr+
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        "Bad current surface (0x3007)",     // No tr+
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        "Bad display (0x3008)",             // No tr+
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        "Bad match (0x3009)",               // No tr+
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        "Bad native pixmap (0x300A)",       // No tr+
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        "Bad native window (0x300B)",       // No tr+
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        "Bad parameter (0x300C)",           // No tr+
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        "Bad surface (0x300D)",             // No tr+
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        "Context lost (0x300E)"             // No tr+
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    };+
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    if (code >= 0x3000 && code <= 0x300E) {+
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        return QString::fromLatin1(errors[code - 0x3000]);+
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    } else {+
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        return QLatin1String("0x") + QString::number(int(code), 16);+
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    }+
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}+
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+
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// Dump all of the EGL configurations supported by the system.+
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void QEglContext::dumpAllConfigs()+
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{+
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    QEglProperties props;+
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    EGLint count = 0;+
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    if (!eglGetConfigs(display(), 0, 0, &count) || count < 1)+
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        return;+
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    EGLConfig *configs = new EGLConfig [count];+
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    eglGetConfigs(display(), configs, count, &count);+
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    for (EGLint index = 0; index < count; ++index) {+
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        props = configProperties(configs[index]);+
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        qWarning() << props.toString();+
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    }+
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    delete [] configs;+
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}+
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+
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QString QEglContext::extensions()+
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{+
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    const char* exts = eglQueryString(QEglContext::display(), EGL_EXTENSIONS);+
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    return QString(QLatin1String(exts));+
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}+
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+
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bool QEglContext::hasExtension(const char* extensionName)+
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{+
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    QList<QByteArray> extensions =+
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        QByteArray(reinterpret_cast<const char *>+
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            (eglQueryString(QEglContext::display(), EGL_EXTENSIONS))).split(' ');+
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    return extensions.contains(extensionName);+
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}+
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+
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QEglContext *QEglContext::currentContext(QEgl::API api)+
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{+
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    if (api == QEgl::OpenGL)+
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        return currentGLContext;+
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    else+
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        return currentVGContext;+
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}+
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+
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void QEglContext::setCurrentContext(QEgl::API api, QEglContext *context)+
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{+
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    if (api == QEgl::OpenGL)+
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        currentGLContext = context;+
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    else+
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        currentVGContext = context;+
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}+
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+
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QT_END_NAMESPACE+
−