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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 753 insertions, 0 deletions

diff --git a/src/gui/egl/qegl.cpp b/src/gui/egl/qegl.cpp
new file mode 100644
index 0000000000..fdb6a1e029
--- /dev/null
+++ b/src/gui/egl/qegl.cpp
@@ -0,0 +1,753 @@
+/****************************************************************************
+**
+** 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 QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, 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.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui/qpaintdevice.h>
+#include <QtGui/qpixmap.h>
+#include <QtGui/qwidget.h>
+#include <QtCore/qatomic.h>
+#include <QtCore/qdebug.h>
+
+#include "qegl_p.h"
+#include "qeglcontext_p.h"
+
+
+QT_BEGIN_NAMESPACE
+
+
+/*
+    QEglContextTracker is used to track the EGL contexts that we
+    create internally in Qt, so that we can call eglTerminate() to
+    free additional EGL resources when the last context is destroyed.
+*/
+
+class QEglContextTracker
+{
+public:
+    static void ref() { contexts.ref(); }
+    static void deref() {
+        if (!contexts.deref()) {
+            eglTerminate(QEgl::display());
+            displayOpen = 0;
+        }
+    }
+    static void setDisplayOpened() { displayOpen = 1; }
+    static bool displayOpened() { return displayOpen; }
+
+private:
+    static QBasicAtomicInt contexts;
+    static QBasicAtomicInt displayOpen;
+};
+
+QBasicAtomicInt QEglContextTracker::contexts = Q_BASIC_ATOMIC_INITIALIZER(0);
+QBasicAtomicInt QEglContextTracker::displayOpen = Q_BASIC_ATOMIC_INITIALIZER(0);
+
+// Current GL and VG contexts.  These are used to determine if
+// we can avoid an eglMakeCurrent() after a call to lazyDoneCurrent().
+// If a background thread modifies the value, the worst that will
+// happen is a redundant eglMakeCurrent() in the foreground thread.
+static QEglContext * volatile currentGLContext = 0;
+static QEglContext * volatile currentVGContext = 0;
+
+QEglContext::QEglContext()
+    : apiType(QEgl::OpenGL)
+    , ctx(EGL_NO_CONTEXT)
+    , cfg(QEGL_NO_CONFIG)
+    , currentSurface(EGL_NO_SURFACE)
+    , current(false)
+    , ownsContext(true)
+    , sharing(false)
+{
+    QEglContextTracker::ref();
+}
+
+QEglContext::~QEglContext()
+{
+    destroyContext();
+
+    if (currentGLContext == this)
+        currentGLContext = 0;
+    if (currentVGContext == this)
+        currentVGContext = 0;
+    QEglContextTracker::deref();
+}
+
+bool QEglContext::isValid() const
+{
+    return (ctx != EGL_NO_CONTEXT);
+}
+
+bool QEglContext::isCurrent() const
+{
+    return current;
+}
+
+EGLConfig QEgl::defaultConfig(int devType, API api, ConfigOptions options)
+{
+    if ( (devType != QInternal::Pixmap) && ((options & Renderable) == 0))
+        qWarning("QEgl::defaultConfig() - Only configs for pixmaps make sense to be read-only!");
+
+    EGLConfig* targetConfig = 0;
+
+    static EGLConfig defaultVGConfigs[] = {
+        QEGL_NO_CONFIG, // 0    Window  Renderable  Translucent
+        QEGL_NO_CONFIG, // 1    Window  Renderable  Opaque
+        QEGL_NO_CONFIG, // 2    Pixmap  Renderable  Translucent
+        QEGL_NO_CONFIG, // 3    Pixmap  Renderable  Opaque
+        QEGL_NO_CONFIG, // 4    Pixmap  ReadOnly    Translucent
+        QEGL_NO_CONFIG  // 5    Pixmap  ReadOnly    Opaque
+    };
+    if (api == OpenVG) {
+        if (devType == QInternal::Widget) {
+            if (options & Translucent)
+                targetConfig = &(defaultVGConfigs[0]);
+            else
+                targetConfig = &(defaultVGConfigs[1]);
+        } else if (devType == QInternal::Pixmap) {
+            if (options & Renderable) {
+                if (options & Translucent)
+                    targetConfig = &(defaultVGConfigs[2]);
+                else // Opaque
+                    targetConfig = &(defaultVGConfigs[3]);
+            } else { // Read-only
+                if (options & Translucent)
+                    targetConfig = &(defaultVGConfigs[4]);
+                else // Opaque
+                    targetConfig = &(defaultVGConfigs[5]);
+            }
+        }
+    }
+
+
+    static EGLConfig defaultGLConfigs[] = {
+        QEGL_NO_CONFIG, // 0    Window  Renderable  Translucent
+        QEGL_NO_CONFIG, // 1    Window  Renderable  Opaque
+        QEGL_NO_CONFIG, // 2    PBuffer Renderable  Translucent
+        QEGL_NO_CONFIG, // 3    PBuffer Renderable  Opaque
+        QEGL_NO_CONFIG, // 4    Pixmap  Renderable  Translucent
+        QEGL_NO_CONFIG, // 5    Pixmap  Renderable  Opaque
+        QEGL_NO_CONFIG, // 6    Pixmap  ReadOnly    Translucent
+        QEGL_NO_CONFIG  // 7    Pixmap  ReadOnly    Opaque
+    };
+    if (api == OpenGL) {
+        if (devType == QInternal::Widget) {
+            if (options & Translucent)
+                targetConfig = &(defaultGLConfigs[0]);
+            else // Opaque
+                targetConfig = &(defaultGLConfigs[1]);
+        } else if (devType == QInternal::Pbuffer) {
+            if (options & Translucent)
+                targetConfig = &(defaultGLConfigs[2]);
+            else // Opaque
+                targetConfig = &(defaultGLConfigs[3]);
+        } else if (devType == QInternal::Pixmap) {
+            if (options & Renderable) {
+                if (options & Translucent)
+                    targetConfig = &(defaultGLConfigs[4]);
+                else // Opaque
+                    targetConfig = &(defaultGLConfigs[5]);
+            } else { // ReadOnly
+                if (options & Translucent)
+                    targetConfig = &(defaultGLConfigs[6]);
+                else // Opaque
+                    targetConfig = &(defaultGLConfigs[7]);
+            }
+        }
+    }
+
+    if (!targetConfig) {
+        qWarning("QEgl::defaultConfig() - No default config for device/api/options combo");
+        return QEGL_NO_CONFIG;
+    }
+    if (*targetConfig != QEGL_NO_CONFIG)
+        return *targetConfig;
+
+
+    // We haven't found an EGL config for the target config yet, so do it now:
+
+
+    // Allow overriding from an environment variable:
+    QByteArray configId;
+    if (api == OpenVG)
+        configId = qgetenv("QT_VG_EGL_CONFIG");
+    else
+        configId = qgetenv("QT_GL_EGL_CONFIG");
+    if (!configId.isEmpty()) {
+        // Overridden, so get the EGLConfig for the specified config ID:
+        EGLint properties[] = {
+            EGL_CONFIG_ID, (EGLint)configId.toInt(),
+            EGL_NONE
+        };
+        EGLint configCount = 0;
+        eglChooseConfig(display(), properties, targetConfig, 1, &configCount);
+        if (configCount > 0)
+            return *targetConfig;
+        qWarning() << "QEgl::defaultConfig() -" << configId << "appears to be invalid";
+    }
+
+    QEglProperties configAttribs;
+    configAttribs.setRenderableType(api);
+
+    EGLint surfaceType;
+    switch (devType) {
+        case QInternal::Widget:
+            surfaceType = EGL_WINDOW_BIT;
+            break;
+        case QInternal::Pixmap:
+            surfaceType = EGL_PIXMAP_BIT;
+            break;
+        case QInternal::Pbuffer:
+            surfaceType = EGL_PBUFFER_BIT;
+            break;
+        default:
+            qWarning("QEgl::defaultConfig() - Can't create EGL surface for %d device type", devType);
+            return QEGL_NO_CONFIG;
+    };
+#ifdef EGL_VG_ALPHA_FORMAT_PRE_BIT
+    // For OpenVG, we try to create a surface using a pre-multiplied format if
+    // the surface needs to have an alpha channel:
+    if (api == OpenVG && (options & Translucent))
+        surfaceType |= EGL_VG_ALPHA_FORMAT_PRE_BIT;
+#endif
+    configAttribs.setValue(EGL_SURFACE_TYPE, surfaceType);
+
+#ifdef EGL_BIND_TO_TEXTURE_RGBA
+    if (devType == QInternal::Pixmap || devType == QInternal::Pbuffer) {
+        if (options & Translucent)
+            configAttribs.setValue(EGL_BIND_TO_TEXTURE_RGBA, EGL_TRUE);
+        else
+            configAttribs.setValue(EGL_BIND_TO_TEXTURE_RGB, EGL_TRUE);
+    }
+#endif
+
+    // Add paint engine requirements
+    if (api == OpenVG) {
+#if !defined(QVG_SCISSOR_CLIP) && defined(EGL_ALPHA_MASK_SIZE)
+        configAttribs.setValue(EGL_ALPHA_MASK_SIZE, 1);
+#endif
+    } else {
+        // Both OpenGL paint engines need to have stencil and sample buffers
+        configAttribs.setValue(EGL_STENCIL_SIZE, 1);
+        configAttribs.setValue(EGL_SAMPLE_BUFFERS, 1);
+#ifndef QT_OPENGL_ES_2
+        // Additionally, the GL1 engine likes to have a depth buffer for clipping
+        configAttribs.setValue(EGL_DEPTH_SIZE, 1);
+#endif
+    }
+
+    if (options & Translucent)
+        configAttribs.setValue(EGL_ALPHA_SIZE, 1);
+
+    *targetConfig = chooseConfig(&configAttribs, QEgl::BestPixelFormat);
+    return *targetConfig;
+}
+
+
+// Choose a configuration that matches "properties".
+EGLConfig QEgl::chooseConfig(const QEglProperties* properties, QEgl::PixelFormatMatch match)
+{
+    QEglProperties props(*properties);
+    EGLConfig cfg = QEGL_NO_CONFIG;
+    do {
+        // Get the number of matching configurations for this set of properties.
+        EGLint matching = 0;
+        EGLDisplay dpy = QEgl::display();
+        if (!eglChooseConfig(dpy, props.properties(), 0, 0, &matching) || !matching)
+            continue;
+
+        // If we want the best pixel format, then return the first
+        // matching configuration.
+        if (match == QEgl::BestPixelFormat) {
+            eglChooseConfig(display(), props.properties(), &cfg, 1, &matching);
+            if (matching < 1)
+                continue;
+            return cfg;
+        }
+
+        // Fetch all of the matching configurations and find the
+        // first that matches the pixel format we wanted.
+        EGLint size = matching;
+        EGLConfig *configs = new EGLConfig [size];
+        eglChooseConfig(display(), props.properties(), configs, size, &matching);
+        for (EGLint index = 0; index < size; ++index) {
+            EGLint red, green, blue, alpha;
+            eglGetConfigAttrib(display(), configs[index], EGL_RED_SIZE, &red);
+            eglGetConfigAttrib(display(), configs[index], EGL_GREEN_SIZE, &green);
+            eglGetConfigAttrib(display(), configs[index], EGL_BLUE_SIZE, &blue);
+            eglGetConfigAttrib(display(), configs[index], EGL_ALPHA_SIZE, &alpha);
+            if (red == props.value(EGL_RED_SIZE) &&
+                    green == props.value(EGL_GREEN_SIZE) &&
+                    blue == props.value(EGL_BLUE_SIZE) &&
+                    (props.value(EGL_ALPHA_SIZE) == 0 ||
+                     alpha == props.value(EGL_ALPHA_SIZE))) {
+                cfg = configs[index];
+                delete [] configs;
+                return cfg;
+            }
+        }
+        delete [] configs;
+    } while (props.reduceConfiguration());
+
+#ifdef EGL_BIND_TO_TEXTURE_RGBA
+    // Don't report an error just yet if we failed to get a pbuffer
+    // configuration with texture rendering.  Only report failure if
+    // we cannot get any pbuffer configurations at all.
+    if (props.value(EGL_BIND_TO_TEXTURE_RGBA) == EGL_DONT_CARE &&
+        props.value(EGL_BIND_TO_TEXTURE_RGB) == EGL_DONT_CARE)
+#endif
+    {
+        qWarning() << "QEglContext::chooseConfig(): Could not find a suitable EGL configuration";
+        qWarning() << "Requested:" << props.toString();
+        qWarning() << "Available:";
+        QEgl::dumpAllConfigs();
+    }
+    return QEGL_NO_CONFIG;
+}
+
+bool QEglContext::chooseConfig(const QEglProperties& properties, QEgl::PixelFormatMatch match)
+{
+    cfg = QEgl::chooseConfig(&properties, match);
+    return cfg != QEGL_NO_CONFIG;
+}
+
+EGLSurface QEglContext::createSurface(QPaintDevice* device, const QEglProperties *properties)
+{
+    return QEgl::createSurface(device, cfg, properties);
+}
+
+
+// Create the EGLContext.
+bool QEglContext::createContext(QEglContext *shareContext, const QEglProperties *properties)
+{
+    // We need to select the correct API before calling eglCreateContext().
+#ifdef QT_OPENGL_ES
+#ifdef EGL_OPENGL_ES_API
+    if (apiType == QEgl::OpenGL)
+        eglBindAPI(EGL_OPENGL_ES_API);
+#endif
+#else
+#ifdef EGL_OPENGL_API
+    if (apiType == QEgl::OpenGL)
+        eglBindAPI(EGL_OPENGL_API);
+#endif
+#endif //defined(QT_OPENGL_ES)
+#ifdef EGL_OPENVG_API
+    if (apiType == QEgl::OpenVG)
+        eglBindAPI(EGL_OPENVG_API);
+#endif
+
+    // Create a new context for the configuration.
+    QEglProperties contextProps;
+    if (properties)
+        contextProps = *properties;
+#ifdef QT_OPENGL_ES_2
+    if (apiType == QEgl::OpenGL)
+        contextProps.setValue(EGL_CONTEXT_CLIENT_VERSION, 2);
+#endif
+    sharing = false;
+    if (shareContext && shareContext->ctx == EGL_NO_CONTEXT)
+        shareContext = 0;
+    if (shareContext) {
+        ctx = eglCreateContext(QEgl::display(), cfg, shareContext->ctx, contextProps.properties());
+        if (ctx == EGL_NO_CONTEXT) {
+            qWarning() << "QEglContext::createContext(): Could not share context:" << QEgl::errorString();
+            shareContext = 0;
+        } else {
+            sharing = true;
+        }
+    }
+    if (ctx == EGL_NO_CONTEXT) {
+        ctx = eglCreateContext(display(), cfg, EGL_NO_CONTEXT, contextProps.properties());
+        if (ctx == EGL_NO_CONTEXT) {
+            qWarning() << "QEglContext::createContext(): Unable to create EGL context:" << QEgl::errorString();
+            return false;
+        }
+    }
+    return true;
+}
+
+// Destroy an EGL surface object.  If it was current on this context
+// then call doneCurrent() for it first.
+void QEglContext::destroySurface(EGLSurface surface)
+{
+    if (surface != EGL_NO_SURFACE) {
+        if (surface == currentSurface)
+            doneCurrent();
+        eglDestroySurface(display(), surface);
+    }
+}
+
+// Destroy the context.  Note: this does not destroy the surface.
+void QEglContext::destroyContext()
+{
+    if (ctx != EGL_NO_CONTEXT && ownsContext)
+        eglDestroyContext(display(), ctx);
+    ctx = EGL_NO_CONTEXT;
+    cfg = 0;
+}
+
+bool QEglContext::makeCurrent(EGLSurface surface)
+{
+    if (ctx == EGL_NO_CONTEXT) {
+        qWarning() << "QEglContext::makeCurrent(): Cannot make invalid context current";
+        return false;
+    }
+
+    if (surface == EGL_NO_SURFACE) {
+        qWarning() << "QEglContext::makeCurrent(): Cannot make invalid surface current";
+        return false;
+    }
+
+    // If lazyDoneCurrent() was called on the surface, then we may be able
+    // to assume that it is still current within the thread.
+    if (surface == currentSurface && currentContext(apiType) == this) {
+        current = true;
+        return true;
+    }
+
+    current = true;
+    currentSurface = surface;
+    setCurrentContext(apiType, this);
+
+    // Force the right API to be bound before making the context current.
+    // The EGL implementation should be able to figure this out from ctx,
+    // but some systems require the API to be explicitly set anyway.
+#ifdef EGL_OPENGL_ES_API
+    if (apiType == QEgl::OpenGL)
+        eglBindAPI(EGL_OPENGL_ES_API);
+#endif
+#ifdef EGL_OPENVG_API
+    if (apiType == QEgl::OpenVG)
+        eglBindAPI(EGL_OPENVG_API);
+#endif
+
+    bool ok = eglMakeCurrent(QEgl::display(), surface, surface, ctx);
+    if (!ok)
+        qWarning() << "QEglContext::makeCurrent(" << surface << "):" << QEgl::errorString();
+    return ok;
+}
+
+bool QEglContext::doneCurrent()
+{
+    // If the context is invalid, we assume that an error was reported
+    // when makeCurrent() was called.
+    if (ctx == EGL_NO_CONTEXT)
+        return false;
+
+    current = false;
+    currentSurface = EGL_NO_SURFACE;
+    setCurrentContext(apiType, 0);
+
+    // We need to select the correct API before calling eglMakeCurrent()
+    // with EGL_NO_CONTEXT because threads can have both OpenGL and OpenVG
+    // contexts active at the same time.
+#ifdef EGL_OPENGL_ES_API
+    if (apiType == QEgl::OpenGL)
+        eglBindAPI(EGL_OPENGL_ES_API);
+#endif
+#ifdef EGL_OPENVG_API
+    if (apiType == QEgl::OpenVG)
+        eglBindAPI(EGL_OPENVG_API);
+#endif
+
+    bool ok = eglMakeCurrent(QEgl::display(), EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+    if (!ok)
+        qWarning() << "QEglContext::doneCurrent():" << QEgl::errorString();
+    return ok;
+}
+
+// Act as though doneCurrent() was called, but keep the context
+// and the surface active for the moment.  This allows makeCurrent()
+// to skip a call to eglMakeCurrent() if we are using the same
+// surface as the last set of painting operations.  We leave the
+// currentContext() pointer as-is for now.
+bool QEglContext::lazyDoneCurrent()
+{
+    current = false;
+    return true;
+}
+
+bool QEglContext::swapBuffers(EGLSurface surface)
+{
+    if(ctx == EGL_NO_CONTEXT)
+        return false;
+
+    bool ok = eglSwapBuffers(QEgl::display(), surface);
+    if (!ok)
+        qWarning() << "QEglContext::swapBuffers():" << QEgl::errorString();
+    return ok;
+}
+
+bool QEglContext::swapBuffersRegion2NOK(EGLSurface surface, const QRegion *region) {
+    QVector<QRect> qrects = region->rects();
+    EGLint *gl_rects;
+    uint count;
+    uint i;
+
+    count = qrects.size();
+    QVarLengthArray <EGLint> arr(4 * count);
+    gl_rects = arr.data();
+    for (i = 0; i < count; i++) {
+      QRect qrect = qrects[i];
+
+      gl_rects[4 * i + 0] = qrect.x();
+      gl_rects[4 * i + 1] = qrect.y();
+      gl_rects[4 * i + 2] = qrect.width();
+      gl_rects[4 * i + 3] = qrect.height();
+    }
+
+    bool ok = QEgl::eglSwapBuffersRegion2NOK(QEgl::display(), surface, count, gl_rects);
+
+    if (!ok)
+        qWarning() << "QEglContext::swapBuffersRegion2NOK():" << QEgl::errorString();
+    return ok;
+}
+
+int QEglContext::configAttrib(int name) const
+{
+    EGLint value;
+    EGLBoolean success = eglGetConfigAttrib(QEgl::display(), cfg, name, &value);
+    if (success)
+        return value;
+    else
+        return EGL_DONT_CARE;
+}
+
+typedef EGLImageKHR (EGLAPIENTRY *_eglCreateImageKHR)(EGLDisplay, EGLContext, EGLenum, EGLClientBuffer, const EGLint*);
+typedef EGLBoolean (EGLAPIENTRY *_eglDestroyImageKHR)(EGLDisplay, EGLImageKHR);
+
+// Defined in qegl.cpp:
+static _eglCreateImageKHR qt_eglCreateImageKHR = 0;
+static _eglDestroyImageKHR qt_eglDestroyImageKHR = 0;
+
+typedef EGLBoolean (EGLAPIENTRY *_eglSwapBuffersRegion2NOK)(EGLDisplay, EGLSurface, EGLint, const EGLint*);
+
+static _eglSwapBuffersRegion2NOK qt_eglSwapBuffersRegion2NOK = 0;
+
+EGLDisplay QEgl::display()
+{
+    static EGLDisplay dpy = EGL_NO_DISPLAY;
+    if (!QEglContextTracker::displayOpened()) {
+        dpy = eglGetDisplay(nativeDisplay());
+        QEglContextTracker::setDisplayOpened();
+        if (dpy == EGL_NO_DISPLAY) {
+            qWarning("QEgl::display(): Falling back to EGL_DEFAULT_DISPLAY");
+            dpy = eglGetDisplay(EGLNativeDisplayType(EGL_DEFAULT_DISPLAY));
+        }
+        if (dpy == EGL_NO_DISPLAY) {
+            qWarning("QEgl::display(): Can't even open the default display");
+            return EGL_NO_DISPLAY;
+        }
+
+        if (!eglInitialize(dpy, NULL, NULL)) {
+            qWarning() << "QEgl::display(): Cannot initialize EGL display:" << QEgl::errorString();
+            return EGL_NO_DISPLAY;
+        }
+
+        // Resolve the egl extension function pointers:
+#if (defined(EGL_KHR_image) || defined(EGL_KHR_image_base)) && !defined(EGL_EGLEXT_PROTOTYPES)
+        if (QEgl::hasExtension("EGL_KHR_image") || QEgl::hasExtension("EGL_KHR_image_base")) {
+            qt_eglCreateImageKHR = (_eglCreateImageKHR) eglGetProcAddress("eglCreateImageKHR");
+            qt_eglDestroyImageKHR = (_eglDestroyImageKHR) eglGetProcAddress("eglDestroyImageKHR");
+        }
+#endif
+
+        if (QEgl::hasExtension("EGL_NOK_swap_region2")) {
+            qt_eglSwapBuffersRegion2NOK = (_eglSwapBuffersRegion2NOK) eglGetProcAddress("eglSwapBuffersRegion2NOK");
+        }
+    }
+
+    return dpy;
+}
+
+EGLImageKHR QEgl::eglCreateImageKHR(EGLDisplay dpy, EGLContext ctx, EGLenum target, EGLClientBuffer buffer, const EGLint *attrib_list)
+{
+    if (qt_eglCreateImageKHR)
+        return qt_eglCreateImageKHR(dpy, ctx, target, buffer, attrib_list);
+
+    QEgl::display(); // Initialises function pointers
+    if (qt_eglCreateImageKHR)
+        return qt_eglCreateImageKHR(dpy, ctx, target, buffer, attrib_list);
+
+    qWarning("QEgl::eglCreateImageKHR() called but EGL_KHR_image(_base) extension not present");
+    return 0;
+}
+
+EGLBoolean QEgl::eglDestroyImageKHR(EGLDisplay dpy, EGLImageKHR img)
+{
+    if (qt_eglDestroyImageKHR)
+        return qt_eglDestroyImageKHR(dpy, img);
+
+    QEgl::display(); // Initialises function pointers
+    if (qt_eglDestroyImageKHR)
+        return qt_eglDestroyImageKHR(dpy, img);
+
+    qWarning("QEgl::eglDestroyImageKHR() called but EGL_KHR_image(_base) extension not present");
+    return 0;
+}
+
+EGLBoolean QEgl::eglSwapBuffersRegion2NOK(EGLDisplay dpy, EGLSurface surface, EGLint count, const EGLint *rects)
+{
+    if (qt_eglSwapBuffersRegion2NOK)
+        return qt_eglSwapBuffersRegion2NOK(dpy, surface, count, rects);
+
+    QEgl::display(); // Initialises function pointers
+    if (qt_eglSwapBuffersRegion2NOK)
+        return qt_eglSwapBuffersRegion2NOK(dpy, surface, count, rects);
+
+    qWarning("QEgl::eglSwapBuffersRegion2NOK() called but EGL_NOK_swap_region2 extension not present");
+    return 0;
+}
+
+#ifndef Q_WS_X11
+EGLSurface QEgl::createSurface(QPaintDevice *device, EGLConfig cfg, const QEglProperties *properties)
+{
+    // Create the native drawable for the paint device.
+    int devType = device->devType();
+    EGLNativePixmapType pixmapDrawable = 0;
+    EGLNativeWindowType windowDrawable = 0;
+    bool ok;
+    if (devType == QInternal::Pixmap) {
+        pixmapDrawable = nativePixmap(static_cast<QPixmap *>(device));
+        ok = (pixmapDrawable != 0);
+    } else if (devType == QInternal::Widget) {
+        windowDrawable = nativeWindow(static_cast<QWidget *>(device));
+        ok = (windowDrawable != 0);
+    } else {
+        ok = false;
+    }
+    if (!ok) {
+        qWarning("QEglContext::createSurface(): Cannot create the native EGL drawable");
+        return EGL_NO_SURFACE;
+    }
+
+    // Create the EGL surface to draw into, based on the native drawable.
+    const int *props;
+    if (properties)
+        props = properties->properties();
+    else
+        props = 0;
+    EGLSurface surf;
+    if (devType == QInternal::Widget)
+        surf = eglCreateWindowSurface(QEgl::display(), cfg, windowDrawable, props);
+    else
+        surf = eglCreatePixmapSurface(QEgl::display(), cfg, pixmapDrawable, props);
+    if (surf == EGL_NO_SURFACE) {
+        qWarning("QEglContext::createSurface(): Unable to create EGL surface, error = 0x%x", eglGetError());
+    }
+    return surf;
+}
+#endif
+
+
+// Return the error string associated with a specific code.
+QString QEgl::errorString(EGLint code)
+{
+    static const char * const errors[] = {
+        "Success (0x3000)",                 // No tr
+        "Not initialized (0x3001)",         // No tr
+        "Bad access (0x3002)",              // No tr
+        "Bad alloc (0x3003)",               // No tr
+        "Bad attribute (0x3004)",           // No tr
+        "Bad config (0x3005)",              // No tr
+        "Bad context (0x3006)",             // No tr
+        "Bad current surface (0x3007)",     // No tr
+        "Bad display (0x3008)",             // No tr
+        "Bad match (0x3009)",               // No tr
+        "Bad native pixmap (0x300A)",       // No tr
+        "Bad native window (0x300B)",       // No tr
+        "Bad parameter (0x300C)",           // No tr
+        "Bad surface (0x300D)",             // No tr
+        "Context lost (0x300E)"             // No tr
+    };
+    if (code >= 0x3000 && code <= 0x300E) {
+        return QString::fromLatin1(errors[code - 0x3000]);
+    } else {
+        return QLatin1String("0x") + QString::number(int(code), 16);
+    }
+}
+
+// Dump all of the EGL configurations supported by the system.
+void QEgl::dumpAllConfigs()
+{
+    QEglProperties props;
+    EGLint count = 0;
+    if (!eglGetConfigs(display(), 0, 0, &count) || count < 1)
+        return;
+    EGLConfig *configs = new EGLConfig [count];
+    eglGetConfigs(display(), configs, count, &count);
+    for (EGLint index = 0; index < count; ++index) {
+        props = QEglProperties(configs[index]);
+        qWarning() << props.toString();
+    }
+    delete [] configs;
+}
+
+QString QEgl::extensions()
+{
+    const char* exts = eglQueryString(QEgl::display(), EGL_EXTENSIONS);
+    return QString(QLatin1String(exts));
+}
+
+bool QEgl::hasExtension(const char* extensionName)
+{
+    QList<QByteArray> extensions =
+        QByteArray(reinterpret_cast<const char *>
+            (eglQueryString(QEgl::display(), EGL_EXTENSIONS))).split(' ');
+    return extensions.contains(extensionName);
+}
+
+QEglContext *QEglContext::currentContext(QEgl::API api)
+{
+    if (api == QEgl::OpenGL)
+        return currentGLContext;
+    else
+        return currentVGContext;
+}
+
+void QEglContext::setCurrentContext(QEgl::API api, QEglContext *context)
+{
+    if (api == QEgl::OpenGL)
+        currentGLContext = context;
+    else
+        currentVGContext = context;
+}
+
+QT_END_NAMESPACE