summaryrefslogtreecommitdiffstats
path: root/src/opengl/qgl_x11egl.cpp
blob: 276b408ea76fa3e98d5b86f3d939ad885e9b7233 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (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 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 "qgl.h"
#include <private/qt_x11_p.h>
#include <private/qpixmap_x11_p.h>
#include <private/qgl_p.h>
#include <private/qpaintengine_opengl_p.h>
#include "qgl_egl_p.h"
#include "qcolormap.h"
#include <QDebug>


QT_BEGIN_NAMESPACE

bool QGLFormat::hasOpenGL()
{
    return true;
}

bool QGLFormat::hasOpenGLOverlays()
{
    return false;
}

void qt_egl_add_platform_config(QEglProperties& props, QPaintDevice *device)
{
    if (device->devType() == QInternal::Image)
        props.setPixelFormat(static_cast<QImage *>(device)->format());
}

bool QGLContext::chooseContext(const QGLContext* shareContext)
{
    Q_D(QGLContext);

    if (!device())
        return false;

    int devType = device()->devType();

    // Get the display and initialize it.
    d->eglContext = new QEglContext();
    d->eglContext->setApi(QEgl::OpenGL);
    if (!d->eglContext->openDisplay(device())) {
        delete d->eglContext;
        d->eglContext = 0;
        return false;
    }

    // Construct the configuration we need for this surface.
    QEglProperties configProps;
    qt_egl_set_format(configProps, devType, d->glFormat);
    qt_egl_add_platform_config(configProps, device());
    configProps.setRenderableType(QEgl::OpenGL);

    // Search for a matching configuration, reducing the complexity
    // each time until we get something that matches.
    if (!d->eglContext->chooseConfig(configProps, QEgl::BestPixelFormat)) {
        delete d->eglContext;
        d->eglContext = 0;
        return false;
    }

    // Inform the higher layers about the actual format properties.
    qt_egl_update_format(*(d->eglContext), d->glFormat);

    // Create a new context for the configuration.
    if (!d->eglContext->createContext
            (shareContext ? shareContext->d_func()->eglContext : 0)) {
        delete d->eglContext;
        d->eglContext = 0;
        return false;
    }

#if defined(EGL_VERSION_1_1)
    if (d->glFormat.swapInterval() != -1 && devType == QInternal::Widget)
        eglSwapInterval(d->eglContext->display(), d->glFormat.swapInterval());
#endif

    return true;
}


void QGLContext::reset()
{
    Q_D(QGLContext);
    if (!d->valid)
        return;
    d->cleanup();
    doneCurrent();
    if (d->eglContext) {
        delete d->eglContext;
        d->eglContext = 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 || !d->eglContext) {
        qWarning("QGLContext::makeCurrent(): Cannot make invalid context current");
        return;
    }

    if (d->eglContext->makeCurrent()) {
        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);
    if (d->eglContext)
        d->eglContext->doneCurrent();

    if (qgl_context_storage.hasLocalData())
        qgl_context_storage.localData()->context = 0;
    currentCtx = 0;
}


void QGLContext::swapBuffers() const
{
    Q_D(const QGLContext);
    if(!d->valid || !d->eglContext)
        return;

    d->eglContext->swapBuffers();
}

QColor QGLContext::overlayTransparentColor() const
{
    return QColor(0, 0, 0);                // Invalid color
}

uint QGLContext::colorIndex(const QColor &c) const
{
    //### color index doesn't work on egl
    Q_UNUSED(c);
    return 0;
}

void QGLContext::generateFontDisplayLists(const QFont & fnt, int listBase)
{
    Q_UNUSED(fnt);
    Q_UNUSED(listBase);
}

void *QGLContext::getProcAddress(const QString &proc) const
{
    return (void*)eglGetProcAddress(reinterpret_cast<const char *>(proc.toLatin1().data()));
}

void QGLWidget::setMouseTracking(bool enable)
{
    QWidget::setMouseTracking(enable);
}


void QGLWidget::resizeEvent(QResizeEvent *)
{
    Q_D(QGLWidget);
    if (!isValid())
        return;
    makeCurrent();
    if (!d->glcx->initialized())
        glInit();
    resizeGL(width(), height());
    //handle overlay
}

const QGLContext* QGLWidget::overlayContext() const
{
    return 0;
}

void QGLWidget::makeOverlayCurrent()
{
    //handle overlay
}

void QGLWidget::updateOverlayGL()
{
    //handle overlay
}

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;
    }

    // If the application has set WA_TranslucentBackground and not explicitly set
    // the alpha buffer size to zero, modify the format so it have an alpha channel
    QGLFormat& fmt = d->glcx->d_func()->glFormat;
    const bool useArgbVisual = testAttribute(Qt::WA_TranslucentBackground);
    if (useArgbVisual && fmt.alphaBufferSize() == -1)
        fmt.setAlphaBufferSize(1);

    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;
    memset(&vi, 0, sizeof(XVisualInfo));

    // Check to see if EGL is suggesting an appropriate visual id:
    EGLint nativeVisualId;
    QEglContext* qeglCtx = d->glcx->d_func()->eglContext;
    qeglCtx->configAttrib(EGL_NATIVE_VISUAL_ID, &nativeVisualId);
    vi.visualid = nativeVisualId;

    if (vi.visualid) {
        // EGL has suggested a visual id, so get the rest of the visual info for that id:
        XVisualInfo *chosenVisualInfo;
        int matchingCount = 0;
        chosenVisualInfo = XGetVisualInfo(x11Info().display(), VisualIDMask, &vi, &matchingCount);
        if (chosenVisualInfo) {
#if !defined(QT_NO_XRENDER)
            if (useArgbVisual) {
                // Check to make sure the visual provided by EGL is ARGB
                XRenderPictFormat *format;
                format = XRenderFindVisualFormat(x11Info().display(), chosenVisualInfo->visual);
                if (format->type == PictTypeDirect && format->direct.alphaMask) {
                    qDebug("Using opaque X Visual ID (%d) provided by EGL", (int)vi.visualid);
                    vi = *chosenVisualInfo;
                }
                else {
                    qWarning("Warning: EGL suggested using X visual ID %d for config %d, but this is not ARGB",
                             nativeVisualId, (int)qeglCtx->config());
                    vi.visualid = 0;
                }
            } else
#endif
            {
                qDebug("Using opaque X Visual ID (%d) provided by EGL", (int)vi.visualid);
                vi = *chosenVisualInfo;
            }
            XFree(chosenVisualInfo);
        }
        else {
            qWarning("Warning: EGL suggested using X visual ID %d for config %d, but this seems to be invalid!",
                     nativeVisualId, (int)qeglCtx->config());
            vi.visualid = 0;
        }
    }

    // If EGL does not know the visual ID, so try to select an appropriate one ourselves, first
    // using XRender if we're supposed to have an alpha, then falling back to XGetVisualInfo

    bool useArgb = context->format().alpha() && !context->deviceIsPixmap();
#if !defined(QT_NO_XRENDER)
    if (vi.visualid == 0 && useArgb) {
        // Try to use XRender to find an ARGB visual we can use
        vi.screen  = x11Info().screen();
        vi.depth   = 32;
        vi.c_class = TrueColor;
        XVisualInfo *matchingVisuals;
        int matchingCount = 0;
        matchingVisuals = XGetVisualInfo(x11Info().display(),
                                         VisualScreenMask|VisualDepthMask|VisualClassMask,
                                         &vi, &matchingCount);

        for (int i = 0; i < matchingCount; ++i) {
            XRenderPictFormat *format;
            format = XRenderFindVisualFormat(x11Info().display(), matchingVisuals[i].visual);
            if (format->type == PictTypeDirect && format->direct.alphaMask) {
                vi = matchingVisuals[i];
                qDebug("Using X Visual ID (%d) for ARGB visual as provided by XRender", (int)vi.visualid);
                break;
            }
        }
        XFree(matchingVisuals);
    }
#endif

    if (vi.visualid == 0) {
        EGLint depth;
        qeglCtx->configAttrib(EGL_BUFFER_SIZE, &depth);
        int err;
        err = XMatchVisualInfo(x11Info().display(), x11Info().screen(), depth, TrueColor, &vi);
        if (err == 0) {
            qWarning("Warning: Can't find an X visual which matches the EGL config(%d)'s depth (%d)!",
                     (int)qeglCtx->config(), depth);
            depth = x11Info().depth();
            err = XMatchVisualInfo(x11Info().display(), x11Info().screen(), depth, TrueColor, &vi);
            if (err == 0) {
                qWarning("Error: Couldn't get any matching X visual!");
                return;
            } else
                qWarning("         - Falling back to X11 suggested depth (%d)", depth);
        } else
            qDebug("Using X Visual ID (%d) for EGL provided depth (%d)", (int)vi.visualid, depth);

        // Don't try to use ARGB now unless the visual is 32-bit - even then it might stil fail :-(
        if (useArgb)
            useArgb = vi.depth == 32;
    }

//    qDebug("Visual Info:");
//    qDebug("   bits_per_rgb=%d", vi.bits_per_rgb);
//    qDebug("   red_mask=0x%x", vi.red_mask);
//    qDebug("   green_mask=0x%x", vi.green_mask);
//    qDebug("   blue_mask=0x%x", vi.blue_mask);
//    qDebug("   colormap_size=%d", vi.colormap_size);
//    qDebug("   c_class=%d", vi.c_class);
//    qDebug("   depth=%d", vi.depth);
//    qDebug("   screen=%d", vi.screen);
//    qDebug("   visualid=%d", vi.visualid);

    XSetWindowAttributes a;

    Window p = RootWindow(x11Info().display(), x11Info().screen());
    if (parentWidget())
        p = parentWidget()->winId();

    QColormap colmap = QColormap::instance(vi.screen);
    a.background_pixel = colmap.pixel(palette().color(backgroundRole()));
    a.border_pixel = colmap.pixel(Qt::black);

    unsigned int valueMask = CWBackPixel|CWBorderPixel;
    if(useArgb) {
        a.colormap = XCreateColormap(x11Info().display(), p, vi.visual, AllocNone);
        valueMask |= CWColormap;
    }

    Window w = XCreateWindow(x11Info().display(), p, x(), y(), width(), height(),
                             0, vi.depth, InputOutput, vi.visual, valueMask, &a);

    if (deleteOldContext)
        delete oldcx;
    oldcx = 0;

    create(w); // Create with the ID of the window we've just created


    // Create the EGL surface to draw into.
    if (!d->glcx->d_func()->eglContext->createSurface(this)) {
        delete d->glcx->d_func()->eglContext;
        d->glcx->d_func()->eglContext = 0;
        return;
    }

    d->eglSurfaceWindowId = w; // Remember the window id we created the surface for

    if (visible)
        show();

    XFlush(X11->display);
    d->glcx->setWindowCreated(true);
}

void QGLWidgetPrivate::init(QGLContext *context, const QGLWidget* shareWidget)
{
    Q_Q(QGLWidget);

    initContext(context, shareWidget);

    if(q->isValid() && glcx->format().hasOverlay()) {
        //no overlay
        qWarning("QtOpenGL ES doesn't currently support overlays");
    }
}

bool QGLWidgetPrivate::renderCxPm(QPixmap*)
{
    return false;
}

void QGLWidgetPrivate::cleanupColormaps()
{
}

const QGLColormap & QGLWidget::colormap() const
{
    return d_func()->cmap;
}

void QGLWidget::setColormap(const QGLColormap &)
{
}

void QGLExtensions::init()
{
    static bool init_done = false;

    if (init_done)
        return;
    init_done = true;
    init_extensions();
}

// Re-creates the EGL surface if the window ID has changed or if force is true
void QGLWidgetPrivate::recreateEglSurface(bool force)
{
    Q_Q(QGLWidget);

    Window currentId = q->winId();

    if ( force || (currentId != eglSurfaceWindowId) ) {
        // The window id has changed so we need to re-create the EGL surface
        if (!glcx->d_func()->eglContext->recreateSurface(q))
            qWarning("Error creating EGL window surface: 0x%x", eglGetError());

        eglSurfaceWindowId = currentId;
    }
}


QGLTexture *QGLContextPrivate::bindTextureFromNativePixmap(QPixmapData* pd, const qint64 key,
                                                           QGLContext::BindOptions options)
{
    Q_Q(QGLContext);

    // The EGL texture_from_pixmap has no facility to invert the y coordinate
    if (!(options & QGLContext::CanFlipNativePixmapBindOption))
        return 0;

    Q_ASSERT(pd->classId() == QPixmapData::X11Class);

    static bool checkedForTFP = false;
    static bool haveTFP = false;

    if (!checkedForTFP) {
        // Check for texture_from_pixmap egl extension
        checkedForTFP = true;
        if (eglContext->hasExtension("EGL_NOKIA_texture_from_pixmap") ||
            eglContext->hasExtension("EGL_EXT_texture_from_pixmap"))
        {
            qDebug("Found texture_from_pixmap EGL extension!");
            haveTFP = true;
        }
    }

    if (!haveTFP)
        return 0;

    QX11PixmapData *pixmapData = static_cast<QX11PixmapData*>(pd);

    bool hasAlpha = pixmapData->hasAlphaChannel();

    // Check to see if the surface is still valid
    if (pixmapData->gl_surface &&
        hasAlpha != (pixmapData->flags & QX11PixmapData::GlSurfaceCreatedWithAlpha))
    {
        // Surface is invalid!
        destroyGlSurfaceForPixmap(pixmapData);
    }

    EGLint pixmapAttribs[] = {
        EGL_TEXTURE_TARGET, EGL_TEXTURE_2D,
        EGL_TEXTURE_FORMAT, hasAlpha ? EGL_TEXTURE_RGBA : EGL_TEXTURE_RGB,
        EGL_NONE
    };
    Q_ASSERT(sizeof(Qt::HANDLE) >= sizeof(EGLSurface)); // Just to make totally sure!
    if (pixmapData->gl_surface == 0)
        pixmapData->gl_surface = (Qt::HANDLE)EGL_NO_SURFACE;
    EGLSurface pixmapSurface = (EGLSurface)pixmapData->gl_surface;
    static EGLConfig pixmapRGBConfig = 0;
    static EGLConfig pixmapRGBAConfig = 0;

    // Check to see if we need to find a config
    if ((hasAlpha && !pixmapRGBAConfig) || (!hasAlpha && !pixmapRGBConfig) ) {
        const EGLint configAttribs[] = {
            EGL_SURFACE_TYPE,           EGL_PIXMAP_BIT,
            EGL_RENDERABLE_TYPE,	EGL_OPENGL_ES2_BIT,
            EGL_DEPTH_SIZE,		0,
            hasAlpha ? EGL_BIND_TO_TEXTURE_RGBA : EGL_BIND_TO_TEXTURE_RGB, EGL_TRUE,
            EGL_NONE
        };

        EGLint configCount = 0;
        eglChooseConfig(eglContext->display(), configAttribs, 0, 256, &configCount);
        if (configCount == 0) {
            haveTFP = false;
            qWarning("bindTextureFromNativePixmap() - Couldn't find a suitable config");
            return 0;
        }

        EGLConfig *configList = new EGLConfig[configCount];
        eglChooseConfig(eglContext->display(), configAttribs, configList, configCount, &configCount);
        Q_ASSERT(configCount);

        // Try to create a pixmap surface for each config until one works
        for (int i = 0; i < configCount; ++i) {
            pixmapSurface = eglCreatePixmapSurface(eglContext->display(), configList[i],
                                                   (EGLNativePixmapType) pixmapData->handle(),
                                                   pixmapAttribs);
            if (pixmapSurface != EGL_NO_SURFACE) {
                // Got one!
                qDebug() << "Found an" << (hasAlpha ? "ARGB" : "RGB")
                         << "config (" << int(configList[i]) << ") to create a pixmap surface";
                if (hasAlpha)
                    pixmapRGBAConfig = configList[i];
                else
                    pixmapRGBConfig = configList[i];
                pixmapData->gl_surface = (Qt::HANDLE)pixmapSurface;
                break;
            }
        }
        delete configList;

        if ((hasAlpha && !pixmapRGBAConfig) || (!hasAlpha && !pixmapRGBConfig) ) {
            qDebug("Couldn't create a pixmap surface with any of the provided configs");
            haveTFP = false;
            return 0;
        }
    }

    if (pixmapSurface == EGL_NO_SURFACE) {
        pixmapSurface = eglCreatePixmapSurface(eglContext->display(),
                                               hasAlpha? pixmapRGBAConfig : pixmapRGBConfig,
                                               (EGLNativePixmapType) pixmapData->handle(),
                                               pixmapAttribs);
        if (pixmapSurface == EGL_NO_SURFACE) {
            qWarning("Failed to create a pixmap surface using config %d",
                        (int)(hasAlpha? pixmapRGBAConfig : pixmapRGBConfig));
            haveTFP = false;
            return 0;
        }
        pixmapData->gl_surface = (Qt::HANDLE)pixmapSurface;
    }

    // Make sure the cleanup hook gets called so we can delete the glx pixmap
    pixmapData->is_cached = true;
    Q_ASSERT(pixmapData->gl_surface);

    GLuint textureId;
    glGenTextures(1, &textureId);
    glEnable(GL_TEXTURE_2D);
    glBindTexture(GL_TEXTURE_2D, textureId);

    // bind the egl pixmap surface to a texture
    EGLBoolean success;
    success = eglBindTexImage(eglContext->display(), pixmapSurface, EGL_BACK_BUFFER);
    if (success == EGL_FALSE) {
        qWarning() << "eglBindTexImage() failed:" << eglContext->errorString(eglGetError());
        eglDestroySurface(eglContext->display(), pixmapSurface);
        pixmapData->gl_surface = (Qt::HANDLE)EGL_NO_SURFACE;
        haveTFP = false;
        return 0;
    }

    // Always inverted because the opposite is not supported...
    options |= QGLContext::InvertedYBindOption;

    QGLTexture *texture = new QGLTexture(q, textureId, GL_TEXTURE_2D, options);
    pixmapData->flags |= QX11PixmapData::InvertedWhenBoundToTexture;

    // We assume the cost of bound pixmaps is zero
    QGLTextureCache::instance()->insert(q, key, texture, 0);

    glBindTexture(GL_TEXTURE_2D, textureId);
    return texture;
}

void QGLContextPrivate::destroyGlSurfaceForPixmap(QPixmapData* pmd)
{
    Q_ASSERT(pmd->classId() == QPixmapData::X11Class);
    QX11PixmapData *pixmapData = static_cast<QX11PixmapData*>(pmd);
    if (pixmapData->gl_surface) {
        EGLBoolean success;
        success = eglDestroySurface(QEglContext::defaultDisplay(0), (EGLSurface)pixmapData->gl_surface);
        if (success == EGL_FALSE) {
            qWarning() << "destroyGlSurfaceForPixmap() - Error deleting surface: "
                       << QEglContext::errorString(eglGetError());
        }
        pixmapData->gl_surface = 0;
    }
}

void QGLContextPrivate::unbindPixmapFromTexture(QPixmapData* pmd)
{
    Q_ASSERT(pmd->classId() == QPixmapData::X11Class);
    QX11PixmapData *pixmapData = static_cast<QX11PixmapData*>(pmd);
    if (pixmapData->gl_surface) {
        EGLBoolean success;
        success = eglReleaseTexImage(QEglContext::defaultDisplay(0),
                                     (EGLSurface)pixmapData->gl_surface,
                                     EGL_BACK_BUFFER);
        if (success == EGL_FALSE) {
            qWarning() << "unbindPixmapFromTexture() - Unable to release bound texture: "
                       << QEglContext::errorString(eglGetError());
        }
    }
}

QT_END_NAMESPACE