source: trunk/src/opengl/qwindowsurface_gl.cpp@ 133

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**
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** Contact: Qt Software Information ([email protected])
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** This file is part of the QtOpenGL module of the Qt Toolkit.
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** General Public License version 2.1 as published by the Free Software
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#include <QtGui/QApplication>
#include <QtGui/QColormap>
#include <QtGui/QDesktopWidget>
#include <QtGui/QPaintDevice>
#include <QtGui/QWidget>

#include <qglframebufferobject.h>
#include <qglpixelbuffer.h>
#include <qcolormap.h>
#include <qdesktopwidget.h>
#include "qdebug.h"

#ifdef Q_WS_X11
#include <private/qt_x11_p.h>
#include <qx11info_x11.h>
#include <private/qwidget_p.h>

#ifndef QT_OPENGL_ES
#include <GL/glx.h>
#include <X11/Xlib.h>
#endif
#endif //Q_WS_X11

#include <private/qglextensions_p.h>
#include <private/qwindowsurface_gl_p.h>

#include <private/qgl_p.h>

#include <private/qglpixelbuffer_p.h>
#include <private/qgraphicssystem_gl_p.h>
#include <private/qpaintengine_opengl_p.h>

#ifndef GLX_ARB_multisample
#define GLX_SAMPLE_BUFFERS_ARB  100000
#define GLX_SAMPLES_ARB         100001
#endif

QT_BEGIN_NAMESPACE

//
// QGLGraphicsSystem
//
#ifdef Q_WS_WIN
Q_GUI_EXPORT bool qt_win_owndc_required;
#endif
QGLGraphicsSystem::QGLGraphicsSystem()
    : QGraphicsSystem()
{
#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;
#if 0
        spec[i++] = GLX_DOUBLEBUFFER;
        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;
#endif
        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(false);

    qt_win_owndc_required = true;
#endif
}

//
// QGLWindowSurface
//

class QGLGlobalShareWidget
{
public:
    QGLGlobalShareWidget() : widget(0) {}

    QGLWidget *shareWidget() {
        if (!widget && !cleanedUp) {
            widget = new QGLWidget;
        }
        return widget;
    }

    void cleanup() {
        delete widget;
        widget = 0;
        cleanedUp = true;
    }

    static bool cleanedUp;

private:
    QGLWidget *widget;
};

bool QGLGlobalShareWidget::cleanedUp = false;

static void qt_cleanup_gl_share_widget();
Q_GLOBAL_STATIC_WITH_INITIALIZER(QGLGlobalShareWidget, _qt_gl_share_widget,
                                 {
                                     qAddPostRoutine(qt_cleanup_gl_share_widget);
                                 })

static void qt_cleanup_gl_share_widget()
{
    _qt_gl_share_widget()->cleanup();
}

QGLWidget* qt_gl_share_widget()
{
    if (QGLGlobalShareWidget::cleanedUp)
        return 0;
    return _qt_gl_share_widget()->shareWidget();
}

struct QGLWindowSurfacePrivate
{