Long live Qt!

1 files changed, 1425 insertions, 0 deletions

diff --git a/src/opengl/qgl_x11.cpp b/src/opengl/qgl_x11.cpp
new file mode 100644
index 0000000..28c34de
--- /dev/null
+++ b/src/opengl/qgl_x11.cpp
@@ -0,0 +1,1425 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtOpenGL 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qgl.h"
+#include "qgl_p.h"
+
+#include "qmap.h"
+#include "qapplication.h"
+#include "qcolormap.h"
+#include "qdesktopwidget.h"
+#include "qpixmap.h"
+#include "qhash.h"
+#include "qlibrary.h"
+#include "qdebug.h"
+#include <private/qfontengine_ft_p.h>
+#include <private/qt_x11_p.h>
+#ifdef Q_OS_HPUX
+// for GLXPBuffer
+#include <private/qglpixelbuffer_p.h>
+#endif
+
+#define INT8  dummy_INT8
+#define INT32 dummy_INT32
+#include <GL/glx.h>
+#undef  INT8
+#undef  INT32
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <X11/Xos.h>
+#include <X11/Xatom.h>
+
+#if defined(Q_OS_LINUX) || defined(Q_OS_BSD4)
+#include <dlfcn.h>
+#endif
+
+QT_BEGIN_NAMESPACE
+
+extern Drawable qt_x11Handle(const QPaintDevice *pd);
+extern const QX11Info *qt_x11Info(const QPaintDevice *pd);
+
+#ifndef GLX_ARB_multisample
+#define GLX_SAMPLE_BUFFERS_ARB  100000
+#define GLX_SAMPLES_ARB         100001
+#endif
+
+/*
+  The qt_gl_choose_cmap function is internal and used by QGLWidget::setContext()
+  and GLX (not Windows).  If the application can't find any sharable
+  colormaps, it must at least create as few colormaps as possible.  The
+  dictionary solution below ensures only one colormap is created per visual.
+  Colormaps are also deleted when the application terminates.
+*/
+
+struct QCMapEntry {
+    QCMapEntry();
+    ~QCMapEntry();
+
+    Colormap cmap;
+    bool alloc;
+    XStandardColormap scmap;
+};
+
+QCMapEntry::QCMapEntry()
+{
+    cmap = 0;
+    alloc = false;
+    scmap.colormap = 0;
+}
+
+QCMapEntry::~QCMapEntry()
+{
+    if (alloc)
+        XFreeColormap(X11->display, cmap);
+}
+typedef QHash<int, QCMapEntry *> CMapEntryHash;
+typedef QHash<int, QMap<int, QRgb> > GLCMapHash;
+static bool mesa_gl = false;
+static bool first_time = true;
+
+static void cleanup_cmaps();
+
+struct QGLCMapCleanupHandler {
+    QGLCMapCleanupHandler() {
+        cmap_hash = new CMapEntryHash;
+        qglcmap_hash = new GLCMapHash;
+    }
+    ~QGLCMapCleanupHandler() {
+        delete cmap_hash;
+        delete qglcmap_hash;
+    }
+    CMapEntryHash *cmap_hash;
+    GLCMapHash *qglcmap_hash;
+};
+Q_GLOBAL_STATIC(QGLCMapCleanupHandler, cmap_handler);
+
+static void cleanup_cmaps()
+{
+    CMapEntryHash *hash = cmap_handler()->cmap_hash;
+    QHash<int, QCMapEntry *>::ConstIterator it = hash->constBegin();
+    while (it != hash->constEnd()) {
+        delete it.value();
+        ++it;
+    }
+
+    hash->clear();
+    cmap_handler()->qglcmap_hash->clear();
+}
+
+Colormap qt_gl_choose_cmap(Display *dpy, XVisualInfo *vi)
+{
+    if (first_time) {
+        const char *v = glXQueryServerString(dpy, vi->screen, GLX_VERSION);
+        if (v)
+            mesa_gl = (strstr(v, "Mesa") != 0);
+        first_time = false;
+    }
+
+    CMapEntryHash *hash = cmap_handler()->cmap_hash;
+    CMapEntryHash::ConstIterator it = hash->constFind((long) vi->visualid + (vi->screen * 256));
+    if (it != hash->constEnd())
+        return it.value()->cmap; // found colormap for visual
+
+    if (vi->visualid ==
+        XVisualIDFromVisual((Visual *) QX11Info::appVisual(vi->screen))) {
+        // qDebug("Using x11AppColormap");
+        return QX11Info::appColormap(vi->screen);
+    }
+
+    QCMapEntry *x = new QCMapEntry();
+
+    XStandardColormap *c;
+    int n, i;
+
+    // qDebug("Choosing cmap for vID %0x", vi->visualid);
+
+    if (mesa_gl) {                                // we're using MesaGL
+        Atom hp_cmaps = XInternAtom(dpy, "_HP_RGB_SMOOTH_MAP_LIST", true);
+        if (hp_cmaps && vi->visual->c_class == TrueColor && vi->depth == 8) {
+            if (XGetRGBColormaps(dpy,RootWindow(dpy,vi->screen),&c,&n,
+                                 hp_cmaps)) {
+                i = 0;
+                while (i < n && x->cmap == 0) {
+                    if (c[i].visualid == vi->visual->visualid) {
+                        x->cmap = c[i].colormap;
+                        x->scmap = c[i];
+                        //qDebug("Using HP_RGB scmap");
+
+                    }
+                    i++;
+                }
+                XFree((char *)c);
+            }
+        }
+    }
+    if (!x->cmap) {
+        if (XGetRGBColormaps(dpy,RootWindow(dpy,vi->screen),&c,&n,
+                             XA_RGB_DEFAULT_MAP)) {
+            for (int i = 0; i < n && x->cmap == 0; ++i) {
+                if (!c[i].red_max ||
+                    !c[i].green_max ||
+                    !c[i].blue_max ||
+                    !c[i].red_mult ||
+                    !c[i].green_mult ||
+                    !c[i].blue_mult)
+                    continue; // invalid stdcmap
+                if (c[i].visualid == vi->visualid) {
+                    x->cmap = c[i].colormap;
+                    x->scmap = c[i];
+                    //qDebug("Using RGB_DEFAULT scmap");
+                }
+            }
+            XFree((char *)c);
+        }
+    }
+    if (!x->cmap) {                                // no shared cmap found
+        x->cmap = XCreateColormap(dpy, RootWindow(dpy,vi->screen), vi->visual,
+                                  AllocNone);
+        x->alloc = true;
+        // qDebug("Allocating cmap");
+    }
+
+    // colormap hash should be cleanup only when the QApplication dtor is called
+    if (hash->isEmpty())
+        qAddPostRoutine(cleanup_cmaps);
+
+    // associate cmap with visualid
+    hash->insert((long) vi->visualid + (vi->screen * 256), x);
+    return x->cmap;
+}
+
+struct QTransColor
+{
+    VisualID vis;
+    int screen;
+    long color;
+};
+
+static QVector<QTransColor> trans_colors;
+static int trans_colors_init = false;
+
+static void find_trans_colors()
+{
+    struct OverlayProp {
+        long  visual;
+        long  type;
+        long  value;
+        long  layer;
+    };
+
+    trans_colors_init = true;
+
+    Display* appDisplay = X11->display;
+
+    int scr;
+    int lastsize = 0;
+    for (scr = 0; scr < ScreenCount(appDisplay); scr++) {
+        QWidget* rootWin = QApplication::desktop()->screen(scr);
+        if (!rootWin)
+            return;                                        // Should not happen
+        Atom overlayVisualsAtom = XInternAtom(appDisplay,
+                                               "SERVER_OVERLAY_VISUALS", True);
+        if (overlayVisualsAtom == XNone)
+            return;                                        // Server has no overlays
+
+        Atom actualType;
+        int actualFormat;
+        ulong nItems;
+        ulong bytesAfter;
+        unsigned char *retval = 0;
+        int res = XGetWindowProperty(appDisplay, rootWin->winId(),
+                                      overlayVisualsAtom, 0, 10000, False,
+                                      overlayVisualsAtom, &actualType,
+                                      &actualFormat, &nItems, &bytesAfter,
+                                      &retval);
+
+        if (res != Success || actualType != overlayVisualsAtom
+             || actualFormat != 32 || nItems < 4 || !retval)
+            return;                                        // Error reading property
+
+        OverlayProp *overlayProps = (OverlayProp *)retval;
+
+        int numProps = nItems / 4;
+        trans_colors.resize(lastsize + numProps);
+        int j = lastsize;
+        for (int i = 0; i < numProps; i++) {
+            if (overlayProps[i].type == 1) {
+                trans_colors[j].vis = (VisualID)overlayProps[i].visual;
+                trans_colors[j].screen = scr;
+                trans_colors[j].color = (int)overlayProps[i].value;
+                j++;
+            }
+        }
+        XFree(overlayProps);
+        lastsize = j;
+        trans_colors.resize(lastsize);
+    }
+}
+
+/*****************************************************************************
+  QGLFormat UNIX/GLX-specific code
+ *****************************************************************************/
+
+bool QGLFormat::hasOpenGL()
+{
+    return glXQueryExtension(X11->display, 0, 0) != 0;
+}
+
+
+bool QGLFormat::hasOpenGLOverlays()
+{
+    if (!trans_colors_init)
+        find_trans_colors();
+    return trans_colors.size() > 0;
+}
+
+/*****************************************************************************
+  QGLContext UNIX/GLX-specific code
+ *****************************************************************************/
+
+bool QGLContext::chooseContext(const QGLContext* shareContext)
+{
+    Q_D(QGLContext);
+    const QX11Info *xinfo = qt_x11Info(d->paintDevice);
+
+    Display* disp = xinfo->display();
+    d->vi = chooseVisual();
+    if (!d->vi)
+        return false;
+
+    if (deviceIsPixmap() &&
+         (((XVisualInfo*)d->vi)->depth != xinfo->depth() ||
+          ((XVisualInfo*)d->vi)->screen != xinfo->screen()))
+    {
+        XFree(d->vi);
+        XVisualInfo appVisInfo;
+        memset(&appVisInfo, 0, sizeof(XVisualInfo));
+        appVisInfo.visualid = XVisualIDFromVisual((Visual *) xinfo->visual());
+        appVisInfo.screen = xinfo->screen();
+        int nvis;
+        d->vi = XGetVisualInfo(disp, VisualIDMask | VisualScreenMask, &appVisInfo, &nvis);
+        if (!d->vi)
+            return false;
+
+        int useGL;
+        glXGetConfig(disp, (XVisualInfo*)d->vi, GLX_USE_GL, &useGL);
+        if (!useGL)
+            return false;        //# Chickening out already...
+    }
+    int res;
+    glXGetConfig(disp, (XVisualInfo*)d->vi, GLX_LEVEL, &res);
+    d->glFormat.setPlane(res);
+    glXGetConfig(disp, (XVisualInfo*)d->vi, GLX_DOUBLEBUFFER, &res);
+    d->glFormat.setDoubleBuffer(res);
+    glXGetConfig(disp, (XVisualInfo*)d->vi, GLX_DEPTH_SIZE, &res);
+    d->glFormat.setDepth(res);
+    if (d->glFormat.depth())
+        d->glFormat.setDepthBufferSize(res);
+    glXGetConfig(disp, (XVisualInfo*)d->vi, GLX_RGBA, &res);
+    d->glFormat.setRgba(res);
+    glXGetConfig(disp, (XVisualInfo*)d->vi, GLX_RED_SIZE, &res);
+    d->glFormat.setRedBufferSize(res);
+    glXGetConfig(disp, (XVisualInfo*)d->vi, GLX_GREEN_SIZE, &res);
+    d->glFormat.setGreenBufferSize(res);
+    glXGetConfig(disp, (XVisualInfo*)d->vi, GLX_BLUE_SIZE, &res);
+    d->glFormat.setBlueBufferSize(res);
+    glXGetConfig(disp, (XVisualInfo*)d->vi, GLX_ALPHA_SIZE, &res);
+    d->glFormat.setAlpha(res);
+    if (d->glFormat.alpha())
+        d->glFormat.setAlphaBufferSize(res);
+    glXGetConfig(disp, (XVisualInfo*)d->vi, GLX_ACCUM_RED_SIZE, &res);
+    d->glFormat.setAccum(res);
+    if (d->glFormat.accum())
+        d->glFormat.setAccumBufferSize(res);
+    glXGetConfig(disp, (XVisualInfo*)d->vi, GLX_STENCIL_SIZE, &res);
+    d->glFormat.setStencil(res);
+    if (d->glFormat.stencil())
+        d->glFormat.setStencilBufferSize(res);
+    glXGetConfig(disp, (XVisualInfo*)d->vi, GLX_STEREO, &res);
+    d->glFormat.setStereo(res);
+    glXGetConfig(disp, (XVisualInfo*)d->vi, GLX_SAMPLE_BUFFERS_ARB, &res);
+    d->glFormat.setSampleBuffers(res);
+    if (d->glFormat.sampleBuffers()) {
+        glXGetConfig(disp, (XVisualInfo*)d->vi, GLX_SAMPLES_ARB, &res);
+        d->glFormat.setSamples(res);
+    }
+
+    Bool direct = format().directRendering() ? True : False;
+
+    if (shareContext &&
+         (!shareContext->isValid() || !shareContext->d_func()->cx)) {
+            qWarning("QGLContext::chooseContext(): Cannot share with invalid context");
+            shareContext = 0;
+    }
+
+    // 1. Sharing between rgba and color-index will give wrong colors.
+    // 2. Contexts cannot be shared btw. direct/non-direct renderers.
+    // 3. Pixmaps cannot share contexts that are set up for direct rendering.
+    // 4. If the contexts are not created on the same screen, they can't be shared
+
+    if (shareContext
+        && (format().rgba() != shareContext->format().rgba()
+            || (deviceIsPixmap() && glXIsDirect(disp, (GLXContext)shareContext->d_func()->cx))
+            || (shareContext->d_func()->screen != xinfo->screen())))
+    {
+        shareContext = 0;
+    }
+
+    d->cx = 0;
+    if (shareContext) {
+        d->cx = glXCreateContext(disp, (XVisualInfo *)d->vi,
+                               (GLXContext)shareContext->d_func()->cx, direct);
+        d->screen = ((XVisualInfo*)d->vi)->screen;
+        if (d->cx) {
+            QGLContext *share = const_cast<QGLContext *>(shareContext);
+            d->sharing = true;
+            share->d_func()->sharing = true;
+        }
+    }
+    if (!d->cx) {
+        d->cx = glXCreateContext(disp, (XVisualInfo *)d->vi, NULL, direct);
+        d->screen = ((XVisualInfo*)d->vi)->screen;
+    }
+    if (!d->cx)
+        return false;
+    d->glFormat.setDirectRendering(glXIsDirect(disp, (GLXContext)d->cx));
+    if (deviceIsPixmap()) {
+#if defined(GLX_MESA_pixmap_colormap) && defined(QGL_USE_MESA_EXT)
+        d->gpm = glXCreateGLXPixmapMESA(disp, (XVisualInfo *)d->vi,
+                                        qt_x11Handle(d->paintDevice),
+                                        qt_gl_choose_cmap(disp, (XVisualInfo *)d->vi));
+#else
+        d->gpm = (quint32)glXCreateGLXPixmap(disp, (XVisualInfo *)d->vi,
+                                              qt_x11Handle(d->paintDevice));
+#endif
+        if (!d->gpm)
+            return false;
+    }
+    QString glxExt = QString(QLatin1String(glXGetClientString(QX11Info::display(), GLX_EXTENSIONS)));
+    if (glxExt.contains(QLatin1String("GLX_SGI_video_sync"))) {
+        if (d->glFormat.swapInterval() == -1)
+            d->glFormat.setSwapInterval(0);
+    } else {
+        d->glFormat.setSwapInterval(-1);
+    }
+    return true;
+}
+
+
+/*!
+  \bold{X11 only:} This virtual function tries to find a
+  visual that matches the format, reducing the demands if the original
+  request cannot be met.
+
+  The algorithm for reducing the demands of the format is quite
+  simple-minded, so override this method in your subclass if your
+  application has spcific requirements on visual selection.
+
+  \sa chooseContext()
+*/
+
+void *QGLContext::chooseVisual()
+{
+    Q_D(QGLContext);
+    static const int bufDepths[] = { 8, 4, 2, 1 };        // Try 16, 12 also?
+    //todo: if pixmap, also make sure that vi->depth == pixmap->depth
+    void* vis = 0;
+    int i = 0;
+    bool fail = false;
+    QGLFormat fmt = format();
+    bool tryDouble = !fmt.doubleBuffer();  // Some GL impl's only have double
+    bool triedDouble = false;
+    bool triedSample = false;
+    if (fmt.sampleBuffers())
+        fmt.setSampleBuffers(QGLExtensions::glExtensions & QGLExtensions::SampleBuffers);
+    while(!fail && !(vis = tryVisual(fmt, bufDepths[i]))) {
+        if (!fmt.rgba() && bufDepths[i] > 1) {
+            i++;
+            continue;
+        }
+        if (tryDouble) {
+            fmt.setDoubleBuffer(true);
+            tryDouble = false;
+            triedDouble = true;
+            continue;
+        } else if (triedDouble) {
+            fmt.setDoubleBuffer(false);
+            triedDouble = false;
+        }
+        if (!triedSample && fmt.sampleBuffers()) {
+            fmt.setSampleBuffers(false);
+            triedSample = true;
+            continue;
+        }
+        if (fmt.stereo()) {
+            fmt.setStereo(false);
+            continue;
+        }
+        if (fmt.accum()) {
+            fmt.setAccum(false);
+            continue;
+        }
+        if (fmt.stencil()) {
+            fmt.setStencil(false);
+            continue;
+        }
+        if (fmt.alpha()) {
+            fmt.setAlpha(false);
+            continue;
+        }
+        if (fmt.depth()) {
+            fmt.setDepth(false);
+            continue;
+        }
+        if (fmt.doubleBuffer()) {
+            fmt.setDoubleBuffer(false);
+            continue;
+        }
+        fail = true;
+    }
+    d->glFormat = fmt;
+    return vis;
+}
+
+
+/*!
+  \internal
+
+  \bold{X11 only:} This virtual function chooses a visual
+  that matches the OpenGL \link format() format\endlink. Reimplement this
+  function in a subclass if you need a custom visual.
+
+  \sa chooseContext()
+*/
+
+void *QGLContext::tryVisual(const QGLFormat& f, int bufDepth)
+{
+    Q_D(QGLContext);
+    int spec[40];
+    int i = 0;
+    spec[i++] = GLX_LEVEL;
+    spec[i++] = f.plane();
+    const QX11Info *xinfo = qt_x11Info(d->paintDevice);
+
+#if defined(GLX_VERSION_1_1) && defined(GLX_EXT_visual_info)
+    static bool useTranspExt = false;
+    static bool useTranspExtChecked = false;
+    if (f.plane() && !useTranspExtChecked && d->paintDevice) {
+        QByteArray estr(glXQueryExtensionsString(xinfo->display(), xinfo->screen()));
+        useTranspExt = estr.contains("GLX_EXT_visual_info");
+        //# (A bit simplistic; that could theoretically be a substring)
+        if (useTranspExt) {
+            QByteArray cstr(glXGetClientString(xinfo->display(), GLX_VENDOR));
+            useTranspExt = !cstr.contains("Xi Graphics"); // bug workaround
+            if (useTranspExt) {
+                // bug workaround - some systems (eg. FireGL) refuses to return an overlay
+                // visual if the GLX_TRANSPARENT_TYPE_EXT attribute is specified, even if
+                // the implementation supports transparent overlays
+                int tmpSpec[] = { GLX_LEVEL, f.plane(), GLX_TRANSPARENT_TYPE_EXT,
+                                  f.rgba() ? GLX_TRANSPARENT_RGB_EXT : GLX_TRANSPARENT_INDEX_EXT,
+                                  XNone };
+                XVisualInfo * vinf = glXChooseVisual(xinfo->display(), xinfo->screen(), tmpSpec);
+                if (!vinf) {
+                    useTranspExt = false;
+                }
+            }
+        }
+
+        useTranspExtChecked = true;
+    }
+    if (f.plane() && useTranspExt) {
+        // Required to avoid non-transparent overlay visual(!) on some systems
+        spec[i++] = GLX_TRANSPARENT_TYPE_EXT;
+        spec[i++] = f.rgba() ? GLX_TRANSPARENT_RGB_EXT : GLX_TRANSPARENT_INDEX_EXT;
+    }
+#endif
+
+    if (f.doubleBuffer())
+        spec[i++] = GLX_DOUBLEBUFFER;
+    if (f.depth()) {
+        spec[i++] = GLX_DEPTH_SIZE;
+        spec[i++] = f.depthBufferSize() == -1 ? 1 : f.depthBufferSize();
+    }
+    if (f.stereo()) {
+        spec[i++] = GLX_STEREO;
+    }
+    if (f.stencil()) {
+        spec[i++] = GLX_STENCIL_SIZE;
+        spec[i++] = f.stencilBufferSize() == -1 ? 1 : f.stencilBufferSize();
+    }
+    if (f.rgba()) {
+        spec[i++] = GLX_RGBA;
+        spec[i++] = GLX_RED_SIZE;
+        spec[i++] = f.redBufferSize() == -1 ? 1 : f.redBufferSize();
+        spec[i++] = GLX_GREEN_SIZE;
+        spec[i++] = f.greenBufferSize() == -1 ? 1 : f.greenBufferSize();
+        spec[i++] = GLX_BLUE_SIZE;
+        spec[i++] = f.blueBufferSize() == -1 ? 1 : f.blueBufferSize();
+        if (f.alpha()) {
+            spec[i++] = GLX_ALPHA_SIZE;
+            spec[i++] = f.alphaBufferSize() == -1 ? 1 : f.alphaBufferSize();
+        }
+        if (f.accum()) {
+            spec[i++] = GLX_ACCUM_RED_SIZE;
+            spec[i++] = f.accumBufferSize() == -1 ? 1 : f.accumBufferSize();
+            spec[i++] = GLX_ACCUM_GREEN_SIZE;
+            spec[i++] = f.accumBufferSize() == -1 ? 1 : f.accumBufferSize();
+            spec[i++] = GLX_ACCUM_BLUE_SIZE;
+            spec[i++] = f.accumBufferSize() == -1 ? 1 : f.accumBufferSize();
+            if (f.alpha()) {
+                spec[i++] = GLX_ACCUM_ALPHA_SIZE;
+                spec[i++] = f.accumBufferSize() == -1 ? 1 : f.accumBufferSize();
+            }
+        }
+    } else {
+        spec[i++] = GLX_BUFFER_SIZE;
+        spec[i++] = bufDepth;
+    }
+
+    if (f.sampleBuffers()) {
+        spec[i++] = GLX_SAMPLE_BUFFERS_ARB;
+        spec[i++] = 1;
+        spec[i++] = GLX_SAMPLES_ARB;
+        spec[i++] = f.samples() == -1 ? 4 : f.samples();
+    }
+
+    spec[i] = XNone;
+    return glXChooseVisual(xinfo->display(), xinfo->screen(), spec);
+}
+
+
+void QGLContext::reset()
+{
+    Q_D(QGLContext);
+    if (!d->valid)
+        return;
+    d->cleanup();
+    const QX11Info *xinfo = qt_x11Info(d->paintDevice);
+    doneCurrent();
+    if (d->gpm)
+        glXDestroyGLXPixmap(xinfo->display(), (GLXPixmap)d->gpm);
+    d->gpm = 0;
+    glXDestroyContext(xinfo->display(), (GLXContext)d->cx);
+    if (d->vi)
+        XFree(d->vi);
+    d->vi = 0;
+    d->cx = 0;
+    d->crWin = false;
+    d->sharing = false;
+    d->valid = false;
+    d->transpColor = QColor();
+    d->initDone = false;
+    qgl_share_reg()->removeShare(this);
+}
+
+
+void QGLContext::makeCurrent()
+{
+    Q_D(QGLContext);
+    if (!d->valid) {
+        qWarning("QGLContext::makeCurrent(): Cannot make invalid context current.");
+        return;
+    }
+    const QX11Info *xinfo = qt_x11Info(d->paintDevice);
+    bool ok = true;
+    if (d->paintDevice->devType() == QInternal::Pixmap) {
+        ok = glXMakeCurrent(xinfo->display(), (GLXPixmap)d->gpm, (GLXContext)d->cx);
+    } else if (d->paintDevice->devType() == QInternal::Pbuffer) {
+        ok = glXMakeCurrent(xinfo->display(), (GLXPbuffer)d->pbuf, (GLXContext)d->cx);
+    } else if (d->paintDevice->devType() == QInternal::Widget) {
+        ok = glXMakeCurrent(xinfo->display(), ((QWidget *)d->paintDevice)->winId(), (GLXContext)d->cx);
+    }
+    if (!ok)
+        qWarning("QGLContext::makeCurrent(): Failed.");
+
+    if (ok) {
+        if (!qgl_context_storage.hasLocalData() && QThread::currentThread())
+            qgl_context_storage.setLocalData(new QGLThreadContext);
+        if (qgl_context_storage.hasLocalData())
+            qgl_context_storage.localData()->context = this;
+        currentCtx = this;
+    }
+}
+
+void QGLContext::doneCurrent()
+{
+    Q_D(QGLContext);
+    glXMakeCurrent(qt_x11Info(d->paintDevice)->display(), 0, 0);
+    if (qgl_context_storage.hasLocalData())
+        qgl_context_storage.localData()->context = 0;
+    currentCtx = 0;
+}
+
+
+void QGLContext::swapBuffers() const
+{
+    Q_D(const QGLContext);
+    if (!d->valid)
+        return;
+    if (!deviceIsPixmap()) {
+        int interval = d->glFormat.swapInterval();
+        if (interval > 0) {
+            typedef int (*qt_glXGetVideoSyncSGI)(uint *);
+            typedef int (*qt_glXWaitVideoSyncSGI)(int, int, uint *);
+            static qt_glXGetVideoSyncSGI glXGetVideoSyncSGI = 0;
+            static qt_glXWaitVideoSyncSGI glXWaitVideoSyncSGI = 0;
+            static bool resolved = false;
+            if (!resolved) {
+                QString glxExt = QString(QLatin1String(glXGetClientString(QX11Info::display(), GLX_EXTENSIONS)));
+                if (glxExt.contains(QLatin1String("GLX_SGI_video_sync"))) {
+#if defined(Q_OS_LINUX) || defined(Q_OS_BSD4)
+                    void *handle = dlopen(NULL, RTLD_LAZY);
+                    if (handle) {
+                        glXGetVideoSyncSGI = (qt_glXGetVideoSyncSGI) dlsym(handle, "glXGetVideoSyncSGI");
+                        glXWaitVideoSyncSGI = (qt_glXWaitVideoSyncSGI) dlsym(handle, "glXWaitVideoSyncSGI");
+                        dlclose(handle);
+                    }
+                    if (!glXGetVideoSyncSGI)
+#endif
+                    {
+                        extern const QString qt_gl_library_name();
+                        QLibrary lib(qt_gl_library_name());
+                        glXGetVideoSyncSGI = (qt_glXGetVideoSyncSGI) lib.resolve("glXGetVideoSyncSGI");
+                        glXWaitVideoSyncSGI = (qt_glXWaitVideoSyncSGI) lib.resolve("glXWaitVideoSyncSGI");
+                    }
+                }
+                resolved = true;
+            }
+            if (glXGetVideoSyncSGI && glXWaitVideoSyncSGI) {
+                uint counter;
+                if (!glXGetVideoSyncSGI(&counter))
+                    glXWaitVideoSyncSGI(interval + 1, (counter + interval) % (interval + 1), &counter);
+            }
+        }
+        glXSwapBuffers(qt_x11Info(d->paintDevice)->display(),
+                       static_cast<QWidget *>(d->paintDevice)->winId());
+    }
+}
+
+QColor QGLContext::overlayTransparentColor() const
+{
+    if (isValid())
+        return Qt::transparent;
+    return QColor();                // Invalid color
+}
+
+static uint qt_transparent_pixel(VisualID id, int screen)
+{
+    for (int i = 0; i < trans_colors.size(); i++) {
+        if (trans_colors[i].vis == id && trans_colors[i].screen == screen)
+            return trans_colors[i].color;
+    }
+    return 0;
+}
+
+uint QGLContext::colorIndex(const QColor& c) const
+{
+    Q_D(const QGLContext);
+    int screen = ((XVisualInfo *)d->vi)->screen;
+    QColormap colmap = QColormap::instance(screen);
+    if (isValid()) {
+        if (format().plane() && c == Qt::transparent) {
+            return qt_transparent_pixel(((XVisualInfo *)d->vi)->visualid,
+                                        ((XVisualInfo *)d->vi)->screen);
+        }
+        if (((XVisualInfo*)d->vi)->visualid ==
+             XVisualIDFromVisual((Visual *) QX11Info::appVisual(screen)))
+            return colmap.pixel(c);                // We're using QColor's cmap
+
+        XVisualInfo *info = (XVisualInfo *) d->vi;
+        CMapEntryHash *hash = cmap_handler()->cmap_hash;
+        CMapEntryHash::ConstIterator it = hash->constFind(long(info->visualid)
+                + (info->screen * 256));
+        QCMapEntry *x = 0;
+        if (it != hash->constEnd())
+            x = it.value();
+        if (x && !x->alloc) {                // It's a standard colormap
+            int rf = (int)(((float)c.red() * (x->scmap.red_max+1))/256.0);
+            int gf = (int)(((float)c.green() * (x->scmap.green_max+1))/256.0);
+            int bf = (int)(((float)c.blue() * (x->scmap.blue_max+1))/256.0);
+            uint p = x->scmap.base_pixel
+                     + (rf * x->scmap.red_mult)
+                     + (gf * x->scmap.green_mult)
+                     + (bf * x->scmap.blue_mult);
+            return p;
+        } else {
+            QMap<int, QRgb> &cmap = (*cmap_handler()->qglcmap_hash)[(long)info->visualid];
+
+            // already in the map?
+            QRgb target = c.rgb();
+            QMap<int, QRgb>::Iterator it = cmap.begin();
+            for (; it != cmap.end(); ++it) {
+                if ((*it) == target)
+                    return it.key();
+            }
+
+            // need to alloc color
+            unsigned long plane_mask[2];
+            unsigned long color_map_entry;
+            if (!XAllocColorCells (QX11Info::display(), x->cmap, true, plane_mask, 0,
+                                   &color_map_entry, 1))
+                return colmap.pixel(c);
+
+            XColor col;
+            col.flags = DoRed | DoGreen | DoBlue;
+            col.pixel = color_map_entry;
+            col.red   = (ushort)((qRed(c.rgb()) / 255.0) * 65535.0 + 0.5);
+            col.green = (ushort)((qGreen(c.rgb()) / 255.0) * 65535.0 + 0.5);
+            col.blue  = (ushort)((qBlue(c.rgb()) / 255.0) * 65535.0 + 0.5);
+            XStoreColor(QX11Info::display(), x->cmap, &col);
+
+            cmap.insert(color_map_entry, target);
+            return color_map_entry;
+        }
+    }
+    return 0;
+}
+
+#ifndef QT_NO_FONTCONFIG
+/*! \internal
+    This is basically a substitute for glxUseXFont() which can only
+    handle XLFD fonts. This version relies on freetype to render the
+    glyphs, but it works with all fonts that fontconfig provides - both
+    antialiased and aliased bitmap and outline fonts.
+*/
+static void qgl_use_font(QFontEngineFT *engine, int first, int count, int listBase)
+{
+    GLfloat color[4];
+    glGetFloatv(GL_CURRENT_COLOR, color);
+
+    // save the pixel unpack state
+    GLint gl_swapbytes, gl_lsbfirst, gl_rowlength, gl_skiprows, gl_skippixels, gl_alignment;
+    glGetIntegerv (GL_UNPACK_SWAP_BYTES, &gl_swapbytes);
+    glGetIntegerv (GL_UNPACK_LSB_FIRST, &gl_lsbfirst);
+    glGetIntegerv (GL_UNPACK_ROW_LENGTH, &gl_rowlength);
+    glGetIntegerv (GL_UNPACK_SKIP_ROWS, &gl_skiprows);
+    glGetIntegerv (GL_UNPACK_SKIP_PIXELS, &gl_skippixels);
+    glGetIntegerv (GL_UNPACK_ALIGNMENT, &gl_alignment);
+
+    glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_FALSE);
+    glPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE);
+    glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+    glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
+    glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
+    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+
+    const bool antialiased = engine->drawAntialiased();
+    FT_Face face = engine->lockFace();
+
+    // start generating font glyphs
+    for (int i = first; i < count; ++i) {
+        int list = listBase + i;
+        GLfloat x0, y0, dx, dy;
+
+        FT_Error err;
+
+        err = FT_Load_Glyph(face, FT_Get_Char_Index(face, i), FT_LOAD_DEFAULT);
+        if (err) {
+            qDebug("failed loading glyph %d from font", i);
+            Q_ASSERT(!err);
+        }
+        err = FT_Render_Glyph(face->glyph, (antialiased ? FT_RENDER_MODE_NORMAL
+                                            : FT_RENDER_MODE_MONO));
+        if (err) {
+            qDebug("failed rendering glyph %d from font", i);
+            Q_ASSERT(!err);
+        }
+
+        FT_Bitmap bm = face->glyph->bitmap;
+        x0 = face->glyph->metrics.horiBearingX >> 6;
+        y0 = (face->glyph->metrics.height - face->glyph->metrics.horiBearingY) >> 6;
+        dx = face->glyph->metrics.horiAdvance >> 6;
+        dy = 0;
+        int sz = bm.pitch * bm.rows;
+        uint *aa_glyph = 0;
+        uchar *ua_glyph = 0;
+
+        if (antialiased)
+            aa_glyph = new uint[sz];
+        else
+            ua_glyph = new uchar[sz];
+
+        // convert to GL format
+        for (int y = 0; y < bm.rows; ++y) {
+            for (int x = 0; x < bm.pitch; ++x) {
+                int c1 = y*bm.pitch + x;
+                int c2 = (bm.rows - y - 1) > 0 ? (bm.rows-y-1)*bm.pitch + x : x;
+                if (antialiased) {
+                    aa_glyph[c1] = (int(color[0]*255) << 24)
+                                   | (int(color[1]*255) << 16)
+                                   | (int(color[2]*255) << 8) | bm.buffer[c2];
+                } else {
+                    ua_glyph[c1] = bm.buffer[c2];
+                }
+            }
+        }
+
+        glNewList(list, GL_COMPILE);
+        if (antialiased) {
+            // calling glBitmap() is just a trick to move the current
+            // raster pos, since glGet*() won't work in display lists
+            glBitmap(0, 0, 0, 0, x0, -y0, 0);
+            glDrawPixels(bm.pitch, bm.rows, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, aa_glyph);
+            glBitmap(0, 0, 0, 0, dx-x0, y0, 0);
+        } else {
+            glBitmap(bm.pitch*8, bm.rows, -x0, y0, dx, dy, ua_glyph);
+        }
+        glEndList();
+        antialiased ? delete[] aa_glyph : delete[] ua_glyph;
+    }
+
+    engine->unlockFace();
+
+    // restore pixel unpack settings
+    glPixelStorei(GL_UNPACK_SWAP_BYTES, gl_swapbytes);
+    glPixelStorei(GL_UNPACK_LSB_FIRST, gl_lsbfirst);
+    glPixelStorei(GL_UNPACK_ROW_LENGTH, gl_rowlength);
+    glPixelStorei(GL_UNPACK_SKIP_ROWS, gl_skiprows);
+    glPixelStorei(GL_UNPACK_SKIP_PIXELS, gl_skippixels);
+    glPixelStorei(GL_UNPACK_ALIGNMENT, gl_alignment);
+}
+#endif
+
+#undef d
+void QGLContext::generateFontDisplayLists(const QFont & fnt, int listBase)
+{
+    QFont f(fnt);
+    QFontEngine *engine = f.d->engineForScript(QUnicodeTables::Common);
+
+    if (engine->type() == QFontEngine::Multi)
+        engine = static_cast<QFontEngineMulti *>(engine)->engine(0);
+#ifndef QT_NO_FONTCONFIG
+    if(engine->type() == QFontEngine::Freetype) {
+        qgl_use_font(static_cast<QFontEngineFT *>(engine), 0, 256, listBase);
+        return;
+    }
+#endif
+    // glXUseXFont() only works with XLFD font structures and a few GL
+    // drivers crash if 0 is passed as the font handle
+    f.setStyleStrategy(QFont::OpenGLCompatible);
+    if (f.handle() && engine->type() == QFontEngine::XLFD)
+        glXUseXFont(static_cast<Font>(f.handle()), 0, 256, listBase);
+}
+
+void *QGLContext::getProcAddress(const QString &proc) const
+{
+    typedef void *(*qt_glXGetProcAddressARB)(const GLubyte *);
+    static qt_glXGetProcAddressARB glXGetProcAddressARB = 0;
+    static bool resolved = false;
+
+    if (resolved && !glXGetProcAddressARB)
+        return 0;
+    if (!glXGetProcAddressARB) {
+        QString glxExt = QString(QLatin1String(glXGetClientString(QX11Info::display(), GLX_EXTENSIONS)));
+        if (glxExt.contains(QLatin1String("GLX_ARB_get_proc_address"))) {
+#if defined(Q_OS_LINUX) || defined(Q_OS_BSD4)
+            void *handle = dlopen(NULL, RTLD_LAZY);
+            if (handle) {
+                glXGetProcAddressARB = (qt_glXGetProcAddressARB) dlsym(handle, "glXGetProcAddressARB");
+                dlclose(handle);
+            }
+            if (!glXGetProcAddressARB)
+#endif
+            {
+                extern const QString qt_gl_library_name();
+                QLibrary lib(qt_gl_library_name());
+                glXGetProcAddressARB = (qt_glXGetProcAddressARB) lib.resolve("glXGetProcAddressARB");
+            }
+        }
+        resolved = true;
+    }
+    if (!glXGetProcAddressARB)
+        return 0;
+    return glXGetProcAddressARB(reinterpret_cast<const GLubyte *>(proc.toLatin1().data()));
+}
+
+/*****************************************************************************
+  QGLOverlayWidget (Internal overlay class for X11)
+ *****************************************************************************/
+
+class QGLOverlayWidget : public QGLWidget
+{
+    Q_OBJECT
+public:
+    QGLOverlayWidget(const QGLFormat& format, QGLWidget* parent, const QGLWidget* shareWidget=0);
+
+protected:
+    void                initializeGL();
+    void                paintGL();
+    void                resizeGL(int w, int h);
+    bool                x11Event(XEvent *e) { return realWidget->x11Event(e); }
+
+private:
+    QGLWidget*                realWidget;
+
+private:
+    Q_DISABLE_COPY(QGLOverlayWidget)
+};
+
+
+QGLOverlayWidget::QGLOverlayWidget(const QGLFormat& format, QGLWidget* parent,
+                                   const QGLWidget* shareWidget)
+    : QGLWidget(format, parent, shareWidget ? shareWidget->d_func()->olw : 0)
+{
+    setAttribute(Qt::WA_X11OpenGLOverlay);
+    realWidget = parent;
+}
+
+
+
+void QGLOverlayWidget::initializeGL()
+{
+    QColor transparentColor = context()->overlayTransparentColor();
+    if (transparentColor.isValid())
+        qglClearColor(transparentColor);
+    else
+        qWarning("QGLOverlayWidget::initializeGL(): Could not get transparent color");
+    realWidget->initializeOverlayGL();
+}
+
+
+void QGLOverlayWidget::resizeGL(int w, int h)
+{
+    glViewport(0, 0, w, h);
+    realWidget->resizeOverlayGL(w, h);
+}
+
+
+void QGLOverlayWidget::paintGL()
+{
+    realWidget->paintOverlayGL();
+}
+
+#undef Bool
+QT_BEGIN_INCLUDE_NAMESPACE
+#include "qgl_x11.moc"
+QT_END_INCLUDE_NAMESPACE
+
+/*****************************************************************************
+  QGLWidget UNIX/GLX-specific code
+ *****************************************************************************/
+void QGLWidgetPrivate::init(QGLContext *context, const QGLWidget *shareWidget)
+{
+    Q_Q(QGLWidget);
+    initContext(context, shareWidget);
+    olw = 0;
+
+    if (q->isValid() && context->format().hasOverlay()) {
+        QString olwName = q->objectName();
+        olwName += QLatin1String("-QGL_internal_overlay_widget");
+        olw = new QGLOverlayWidget(QGLFormat::defaultOverlayFormat(), q, shareWidget);
+        olw->setObjectName(olwName);
+        if (olw->isValid()) {
+            olw->setAutoBufferSwap(false);
+            olw->setFocusProxy(q);
+        }
+        else {
+            delete olw;
+            olw = 0;
+            glcx->d_func()->glFormat.setOverlay(false);
+        }
+    }
+}
+
+bool QGLWidgetPrivate::renderCxPm(QPixmap* pm)
+{
+    Q_Q(QGLWidget);
+    if (((XVisualInfo*)glcx->d_func()->vi)->depth != pm->depth())
+        return false;
+
+    GLXPixmap glPm;
+#if defined(GLX_MESA_pixmap_colormap) && defined(QGL_USE_MESA_EXT)
+    glPm = glXCreateGLXPixmapMESA(X11->display,
+                                   (XVisualInfo*)glcx->vi,
+                                   (Pixmap)pm->handle(),
+                                   qt_gl_choose_cmap(pm->X11->display,
+                                                (XVisualInfo*)glcx->vi));
+#else
+    glPm = (quint32)glXCreateGLXPixmap(X11->display,
+                                         (XVisualInfo*)glcx->d_func()->vi,
+                                         (Pixmap)pm->handle());
+#endif
+
+    if (!glXMakeCurrent(X11->display, glPm, (GLXContext)glcx->d_func()->cx)) {
+        glXDestroyGLXPixmap(X11->display, glPm);
+        return false;
+    }
+
+    glDrawBuffer(GL_FRONT);
+    if (!glcx->initialized())
+        q->glInit();
+    q->resizeGL(pm->width(), pm->height());
+    q->paintGL();
+    glFlush();
+    q->makeCurrent();
+    glXDestroyGLXPixmap(X11->display, glPm);
+    q->resizeGL(q->width(), q->height());
+    return true;
+}
+
+/*! \internal
+  Free up any allocated colormaps. This fn is only called for
+  top-level widgets.
+*/
+void QGLWidgetPrivate::cleanupColormaps()
+{
+    if (!cmap.handle()) {
+        return;
+    } else {
+        XFreeColormap(X11->display, (Colormap) cmap.handle());
+        cmap.setHandle(0);
+    }
+}
+
+void QGLWidget::setMouseTracking(bool enable)
+{
+    Q_D(QGLWidget);
+    if (d->olw)
+        d->olw->setMouseTracking(enable);
+    QWidget::setMouseTracking(enable);
+}
+
+
+void QGLWidget::resizeEvent(QResizeEvent *)
+{
+    Q_D(QGLWidget);
+    if (!isValid())
+        return;
+    makeCurrent();
+    if (!d->glcx->initialized())
+        glInit();
+    glXWaitX();
+    resizeGL(width(), height());
+    if (d->olw)
+        d->olw->setGeometry(rect());
+}
+
+const QGLContext* QGLWidget::overlayContext() const
+{
+    Q_D(const QGLWidget);
+    if (d->olw)
+        return d->olw->context();
+    else
+        return 0;
+}
+
+
+void QGLWidget::makeOverlayCurrent()
+{
+    Q_D(QGLWidget);
+    if (d->olw)
+        d->olw->makeCurrent();
+}
+
+
+void QGLWidget::updateOverlayGL()
+{
+    Q_D(QGLWidget);
+    if (d->olw)
+        d->olw->updateGL();
+}
+
+/*!
+    \internal
+
+    Sets a new QGLContext, \a context, for this QGLWidget, using the
+    shared context, \a shareContext. If \a deleteOldContext is true,
+    the original context is deleted; otherwise it is overridden.
+*/
+void QGLWidget::setContext(QGLContext *context,
+                            const QGLContext* shareContext,
+                            bool deleteOldContext)
+{
+    Q_D(QGLWidget);
+    if (context == 0) {
+        qWarning("QGLWidget::setContext: Cannot set null context");
+        return;
+    }
+    if (!context->deviceIsPixmap() && context->device() != this) {
+        qWarning("QGLWidget::setContext: Context must refer to this widget");
+        return;
+    }
+
+    if (d->glcx)
+        d->glcx->doneCurrent();
+    QGLContext* oldcx = d->glcx;
+    d->glcx = context;
+
+
+    if (parentWidget()) {
+        // force creation of delay-created widgets
+        parentWidget()->winId();
+        if (parentWidget()->x11Info().screen() != x11Info().screen())
+            d_func()->xinfo = parentWidget()->d_func()->xinfo;
+    }
+
+    bool createFailed = false;
+    if (!d->glcx->isValid()) {
+        if (!d->glcx->create(shareContext ? shareContext : oldcx))
+            createFailed = true;
+    }
+    if (createFailed) {
+        if (deleteOldContext)
+            delete oldcx;
+        return;
+    }
+
+    if (d->glcx->windowCreated() || d->glcx->deviceIsPixmap()) {
+        if (deleteOldContext)
+            delete oldcx;
+        return;
+    }
+
+    bool visible = isVisible();
+    if (visible)
+        hide();
+
+    XVisualInfo *vi = (XVisualInfo*)d->glcx->d_func()->vi;
+    XSetWindowAttributes a;
+
+    QColormap colmap = QColormap::instance(vi->screen);
+    a.colormap = qt_gl_choose_cmap(QX11Info::display(), vi);        // find best colormap
+    a.background_pixel = colmap.pixel(palette().color(backgroundRole()));
+    a.border_pixel = colmap.pixel(Qt::black);
+    Window p = RootWindow(X11->display, vi->screen);
+    if (parentWidget())
+        p = parentWidget()->winId();
+
+    Window w = XCreateWindow(X11->display, p, x(), y(), width(), height(),
+                              0, vi->depth, InputOutput, vi->visual,
+                              CWBackPixel|CWBorderPixel|CWColormap, &a);
+    Window *cmw;
+    Window *cmwret;
+    int count;
+    if (XGetWMColormapWindows(X11->display, window()->winId(),
+                                &cmwret, &count)) {
+        cmw = new Window[count+1];
+        memcpy((char *)cmw, (char *)cmwret, sizeof(Window)*count);
+        XFree((char *)cmwret);
+        int i;
+        for (i=0; i<count; i++) {
+            if (cmw[i] == winId()) {                // replace old window
+                cmw[i] = w;
+                break;
+            }
+        }
+        if (i >= count)                        // append new window
+            cmw[count++] = w;
+    } else {
+        count = 1;
+        cmw = new Window[count];
+        cmw[0] = w;
+    }
+
+#if defined(GLX_MESA_release_buffers) && defined(QGL_USE_MESA_EXT)
+    if (oldcx && oldcx->windowCreated())
+        glXReleaseBuffersMESA(X11->display, winId());
+#endif
+    if (deleteOldContext)
+        delete oldcx;
+    oldcx = 0;
+
+    if (testAttribute(Qt::WA_WState_Created))
+        create(w);
+    else
+        d->createWinId(w);
+    XSetWMColormapWindows(X11->display, window()->winId(), cmw, count);
+    delete [] cmw;
+
+    // calling QWidget::create() will always result in a new paint
+    // engine being created - get rid of it and replace it with our
+    // own
+
+    if (visible)
+        show();
+    XFlush(X11->display);
+    d->glcx->setWindowCreated(true);
+}
+
+const QGLColormap & QGLWidget::colormap() const
+{
+    Q_D(const QGLWidget);
+    return d->cmap;
+}
+
+/*\internal
+  Store color values in the given colormap.
+*/
+static void qStoreColors(QWidget * tlw, Colormap cmap,
+                          const QGLColormap & cols)
+{
+    Q_UNUSED(tlw);
+    XColor c;
+    QRgb color;
+
+    for (int i = 0; i < cols.size(); i++) {
+        color = cols.entryRgb(i);
+        c.pixel = i;
+        c.red   = (ushort)((qRed(color) / 255.0) * 65535.0 + 0.5);
+        c.green = (ushort)((qGreen(color) / 255.0) * 65535.0 + 0.5);
+        c.blue  = (ushort)((qBlue(color) / 255.0) * 65535.0 + 0.5);
+        c.flags = DoRed | DoGreen | DoBlue;
+        XStoreColor(X11->display, cmap, &c);
+    }
+}
+
+/*\internal
+  Check whether the given visual supports dynamic colormaps or not.
+*/
+static bool qCanAllocColors(QWidget * w)
+{
+    bool validVisual = false;
+    int  numVisuals;
+    long mask;
+    XVisualInfo templ;
+    XVisualInfo * visuals;
+    VisualID id = XVisualIDFromVisual((Visual *) w->window()->x11Info().visual());
+
+    mask = VisualScreenMask;
+    templ.screen = w->x11Info().screen();
+    visuals = XGetVisualInfo(X11->display, mask, &templ, &numVisuals);
+
+    for (int i = 0; i < numVisuals; i++) {
+        if (visuals[i].visualid == id) {
+            switch (visuals[i].c_class) {
+                case TrueColor:
+                case StaticColor:
+                case StaticGray:
+                case XGrayScale:
+                    validVisual = false;
+                    break;
+                case DirectColor:
+                case PseudoColor:
+                    validVisual = true;
+                    break;
+            }
+            break;
+        }
+    }
+    XFree(visuals);
+
+    if (!validVisual)
+        return false;
+    return true;
+}
+
+
+void QGLWidget::setColormap(const QGLColormap & c)
+{
+    Q_D(QGLWidget);
+    QWidget * tlw = window(); // must return a valid widget
+
+    d->cmap = c;
+    if (!d->cmap.handle())
+        return;
+
+    if (!qCanAllocColors(this)) {
+        qWarning("QGLWidget::setColormap: Cannot create a read/write "
+                  "colormap for this visual");
+        return;
+    }
+
+    // If the child GL widget is not of the same visual class as the
+    // toplevel widget we will get in trouble..
+    Window wid = tlw->winId();
+    Visual * vis = (Visual *) tlw->x11Info().visual();;
+    VisualID cvId = XVisualIDFromVisual((Visual *) x11Info().visual());
+    VisualID tvId = XVisualIDFromVisual((Visual *) tlw->x11Info().visual());
+    if (cvId != tvId) {
+        wid = winId();
+        vis = (Visual *) x11Info().visual();
+    }
+
+    if (!d->cmap.handle()) // allocate a cmap if necessary
+        d->cmap.setHandle(XCreateColormap(X11->display, wid, vis, AllocAll));
+
+    qStoreColors(this, (Colormap) d->cmap.handle(), c);
+    XSetWindowColormap(X11->display, wid, (Colormap) d->cmap.handle());
+
+    // tell the wm that this window has a special colormap
+    Window * cmw;
+    Window * cmwret;
+    int count;
+    if (XGetWMColormapWindows(X11->display, tlw->winId(), &cmwret, &count))
+    {
+        cmw = new Window[count+1];
+        memcpy((char *) cmw, (char *) cmwret, sizeof(Window) * count);
+        XFree((char *) cmwret);
+        int i;
+        for (i = 0; i < count; i++) {
+            if (cmw[i] == winId()) {
+                break;
+            }
+        }
+        if (i >= count)   // append new window only if not in the list
+            cmw[count++] = winId();
+    } else {
+        count = 1;
+        cmw = new Window[count];
+        cmw[0] = winId();
+    }
+    XSetWMColormapWindows(X11->display, tlw->winId(), cmw, count);
+    delete [] cmw;
+}
+
+void QGLExtensions::init()
+{
+    static bool init_done = false;
+
+    if (init_done)
+        return;
+    init_done = true;
+
+    QGLWidget dmy;
+    dmy.makeCurrent();
+    init_extensions();
+
+    // nvidia 9x.xx unix drivers contain a bug which requires us to call glFinish before releasing an fbo
+    // to avoid painting artifacts
+    const QByteArray versionString(reinterpret_cast<const char*>(glGetString(GL_VERSION)));
+    const int pos = versionString.indexOf("NVIDIA");
+    if (pos >= 0) {
+        const float nvidiaDriverVersion = versionString.mid(pos + strlen("NVIDIA")).toFloat();
+        nvidiaFboNeedsFinish = nvidiaDriverVersion >= 90.0 && nvidiaDriverVersion < 100.0;
+    }
+}
+
+QT_END_NAMESPACE