qgl_x11.cpp

奇趣公司比较新的qt/emd版本

public:
    QGLOverlayWidget(const QGLFormat& format, QGLWidget* parent, const QGLWidget* shareWidget=0);

protected:
    void                initializeGL();
    void                paintGL();
    void                resizeGL(int w, int h);

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
#include "qgl_x11.moc"

/*****************************************************************************
  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(),
                                   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);
    }
}

/*! \reimp */
bool QGLWidget::event(QEvent *e)
{
    Q_D(QGLWidget);
    // prevents X errors on some systems, where we get a flush to a
    // hidden widget
    if (e->type() == QEvent::Hide) {
        makeCurrent();
        glFinish();
        doneCurrent();
    } else if (e->type() == QEvent::ParentChange) {
        if (d->glcx->d_func()->screen != d->xinfo.screen()) {
            setContext(new QGLContext(d->glcx->requestedFormat(), this));
            // ### recreating the overlay isn't supported atm
        }
    }

    return QWidget::event(e);
}


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 = 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;
    }
}