QGLGraphicsSystem Class Reference

#include <qgraphicssystem_gl_p.h>

Inheritance diagram for QGLGraphicsSystem:

Public Functions
QPixmapData *	createPixmapData (QPixmapData::PixelType type) const
QWindowSurface *	createWindowSurface (QWidget *widget) const
	QGLGraphicsSystem (bool useX11GL)
Public Functions inherited from QGraphicsSystem
virtual QPixmapData *	createPixmapData (QPixmapData *origin)
virtual QGraphicsSystemEx *	platformExtension ()
virtual	~QGraphicsSystem ()

Properties
bool	m_useX11GL

Additional Inherited Members
Static Public Functions inherited from QGraphicsSystem
static QPixmapData *	createDefaultPixmapData (QPixmapData::PixelType type)

Detailed Description

Definition at line 66 of file qgraphicssystem_gl_p.h.

Constructors and Destructors

QGLGraphicsSystem()

QGLGraphicsSystem::QGLGraphicsSystem

(

bool

useX11GL

)

Definition at line 97 of file qwindowsurface_gl.cpp.

    : QGraphicsSystem(), m_useX11GL(useX11GL)
{
#if defined(Q_WS_X11) && !defined(QT_OPENGL_ES)
    // only override the system defaults if the user hasn't already
    // picked a visual
    if (X11->visual == 0 && X11->visual_id == -1 && X11->visual_class == -1) {
        // find a double buffered, RGBA visual that supports OpenGL
        // and set that as the default visual for windows in Qt
        int i = 0;
        int spec[16];
        spec[i++] = GLX_RGBA;
        spec[i++] = GLX_DOUBLEBUFFER;

        if (!qgetenv("QT_GL_SWAPBUFFER_PRESERVE").isNull()) {
            spec[i++] = GLX_DEPTH_SIZE;
            spec[i++] = 8;
            spec[i++] = GLX_STENCIL_SIZE;
            spec[i++] = 8;
            spec[i++] = GLX_SAMPLE_BUFFERS_ARB;
            spec[i++] = 1;
            spec[i++] = GLX_SAMPLES_ARB;
            spec[i++] = 4;
        }

        spec[i++] = XNone;

        XVisualInfo *vi = glXChooseVisual(X11->display, X11->defaultScreen, spec);
        if (vi) {
            X11->visual_id = vi->visualid;
            X11->visual_class = vi->c_class;

            QGLFormat format;
            int res;
            glXGetConfig(X11->display, vi, GLX_LEVEL, &res);
            format.setPlane(res);
            glXGetConfig(X11->display, vi, GLX_DOUBLEBUFFER, &res);
            format.setDoubleBuffer(res);
            glXGetConfig(X11->display, vi, GLX_DEPTH_SIZE, &res);
            format.setDepth(res);
            if (format.depth())
                format.setDepthBufferSize(res);
            glXGetConfig(X11->display, vi, GLX_RGBA, &res);
            format.setRgba(res);
            glXGetConfig(X11->display, vi, GLX_RED_SIZE, &res);
            format.setRedBufferSize(res);
            glXGetConfig(X11->display, vi, GLX_GREEN_SIZE, &res);
            format.setGreenBufferSize(res);
            glXGetConfig(X11->display, vi, GLX_BLUE_SIZE, &res);
            format.setBlueBufferSize(res);
            glXGetConfig(X11->display, vi, GLX_ALPHA_SIZE, &res);
            format.setAlpha(res);
            if (format.alpha())
                format.setAlphaBufferSize(res);
            glXGetConfig(X11->display, vi, GLX_ACCUM_RED_SIZE, &res);
            format.setAccum(res);
            if (format.accum())
                format.setAccumBufferSize(res);
            glXGetConfig(X11->display, vi, GLX_STENCIL_SIZE, &res);
            format.setStencil(res);
            if (format.stencil())
                format.setStencilBufferSize(res);
            glXGetConfig(X11->display, vi, GLX_STEREO, &res);
            format.setStereo(res);
            glXGetConfig(X11->display, vi, GLX_SAMPLE_BUFFERS_ARB, &res);
            format.setSampleBuffers(res);
            if (format.sampleBuffers()) {
                glXGetConfig(X11->display, vi, GLX_SAMPLES_ARB, &res);
                format.setSamples(res);
            }

            QGLWindowSurface::surfaceFormat = format;
            XFree(vi);

            printf("using visual class %x, id %x\n", X11->visual_class, X11->visual_id);
        }
    }
#elif defined(Q_WS_WIN)
    QGLWindowSurface::surfaceFormat.setDoubleBuffer(true);

    qt_win_owndc_required = true;
#endif
}

Functions

createPixmapData()

QPixmapData * QGLGraphicsSystem::createPixmapData ( QPixmapData::PixelType  type ) const

virtual

Implements QGraphicsSystem.

Definition at line 65 of file qgraphicssystem_gl.cpp.

{
    return new QGLPixmapData(type);
}

createWindowSurface()

QWindowSurface * QGLGraphicsSystem::createWindowSurface ( QWidget *  widget ) const

virtual

Implements QGraphicsSystem.

Definition at line 70 of file qgraphicssystem_gl.cpp.

{
#ifdef Q_WS_WIN
    // On Windows the QGLWindowSurface class can't handle
    // drop shadows and native effects, e.g. fading a menu in/out using
    // top level window opacity.
    if (widget->windowType() == Qt::Popup)
        return new QRasterWindowSurface(widget);
#endif

#if defined(Q_WS_X11) && !defined(QT_NO_EGL)
    if (m_useX11GL && QX11GLPixmapData::hasX11GLPixmaps()) {
        // If the widget is a QGraphicsView which will be re-drawing the entire
        // scene each frame anyway, we should use QGLWindowSurface as this may
        // provide proper buffer flipping, which should be faster than QX11GL's
        // blitting approach:
        QGraphicsView* qgv = qobject_cast<QGraphicsView*>(widget);
        if (qgv && qgv->viewportUpdateMode() == QGraphicsView::FullViewportUpdate)
            return new QGLWindowSurface(widget);
        else
            return new QX11GLWindowSurface(widget);
    }
#endif

#if defined(Q_OS_SYMBIAN)
    if (!QApplicationPrivate::instance()->useTranslucentEGLSurfaces) {
        QWidgetPrivate *d = qt_widget_private(widget);
        if (!d->isOpaque && widget->testAttribute(Qt::WA_TranslucentBackground))
            return d->createDefaultWindowSurface_sys();
    }
#endif

    return new QGLWindowSurface(widget);
}

Properties

m_useX11GL

bool QGLGraphicsSystem::m_useX11GL

private

Definition at line 83 of file qgraphicssystem_gl_p.h.

Referenced by createWindowSurface().

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The documentation for this class was generated from the following files:

• /src/opengl/qgraphicssystem_gl_p.h
• /src/opengl/qgraphicssystem_gl.cpp
• /src/opengl/qwindowsurface_gl.cpp