summaryrefslogtreecommitdiffstats
path: root/src/gui/egl/qegl.cpp
blob: e6ea198b58271d75264b97af6b8eda6e640350f2 (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
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui 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 <QtGui/qpaintdevice.h>
#include <QtGui/qpixmap.h>
#include <QtGui/qwidget.h>
#include <QtCore/qatomic.h>
#include <QtCore/qdebug.h>

#include "qegl_p.h"
#include "qeglcontext_p.h"


QT_BEGIN_NAMESPACE


/*
    QEglContextTracker is used to track the EGL contexts that we
    create internally in Qt, so that we can call eglTerminate() to
    free additional EGL resources when the last context is destroyed.
*/

class QEglContextTracker
{
public:
    static void ref() { contexts.ref(); }
    static void deref() {
        if (!contexts.deref()) {
            eglTerminate(QEgl::display());
            displayOpen = 0;
        }
    }
    static void setDisplayOpened() { displayOpen = 1; }
    static bool displayOpened() { return displayOpen; }

private:
    static QBasicAtomicInt contexts;
    static QBasicAtomicInt displayOpen;
};

QBasicAtomicInt QEglContextTracker::contexts = Q_BASIC_ATOMIC_INITIALIZER(0);
QBasicAtomicInt QEglContextTracker::displayOpen = Q_BASIC_ATOMIC_INITIALIZER(0);

// Current GL and VG contexts.  These are used to determine if
// we can avoid an eglMakeCurrent() after a call to lazyDoneCurrent().
// If a background thread modifies the value, the worst that will
// happen is a redundant eglMakeCurrent() in the foreground thread.
static QEglContext * volatile currentGLContext = 0;
static QEglContext * volatile currentVGContext = 0;

QEglContext::QEglContext()
    : apiType(QEgl::OpenGL)
    , ctx(EGL_NO_CONTEXT)
    , cfg(QEGL_NO_CONFIG)
    , currentSurface(EGL_NO_SURFACE)
    , current(false)
    , ownsContext(true)
    , sharing(false)
{
    QEglContextTracker::ref();
}

QEglContext::~QEglContext()
{
    destroyContext();

    if (currentGLContext == this)
        currentGLContext = 0;
    if (currentVGContext == this)
        currentVGContext = 0;
    QEglContextTracker::deref();
}

bool QEglContext::isValid() const
{
    return (ctx != EGL_NO_CONTEXT);
}

bool QEglContext::isCurrent() const
{
    return current;
}

EGLConfig QEgl::defaultConfig(int devType, API api, ConfigOptions options)
{
    if ( (devType != QInternal::Pixmap) && ((options & Renderable) == 0))
        qWarning("QEgl::defaultConfig() - Only configs for pixmaps make sense to be read-only!");

    EGLConfig* targetConfig = 0;

    static EGLConfig defaultVGConfigs[] = {
        QEGL_NO_CONFIG, // 0    Window  Renderable  Translucent
        QEGL_NO_CONFIG, // 1    Window  Renderable  Opaque
        QEGL_NO_CONFIG, // 2    Pixmap  Renderable  Translucent
        QEGL_NO_CONFIG, // 3    Pixmap  Renderable  Opaque
        QEGL_NO_CONFIG, // 4    Pixmap  ReadOnly    Translucent
        QEGL_NO_CONFIG  // 5    Pixmap  ReadOnly    Opaque
    };
    if (api == OpenVG) {
        if (devType == QInternal::Widget) {
            if (options & Translucent)
                targetConfig = &(defaultVGConfigs[0]);
            else
                targetConfig = &(defaultVGConfigs[1]);
        } else if (devType == QInternal::Pixmap) {
            if (options & Renderable) {
                if (options & Translucent)
                    targetConfig = &(defaultVGConfigs[2]);
                else // Opaque
                    targetConfig = &(defaultVGConfigs[3]);
            } else { // Read-only
                if (options & Translucent)
                    targetConfig = &(defaultVGConfigs[4]);
                else // Opaque
                    targetConfig = &(defaultVGConfigs[5]);
            }
        }
    }


    static EGLConfig defaultGLConfigs[] = {
        QEGL_NO_CONFIG, // 0    Window  Renderable  Translucent
        QEGL_NO_CONFIG, // 1    Window  Renderable  Opaque
        QEGL_NO_CONFIG, // 2    PBuffer Renderable  Translucent
        QEGL_NO_CONFIG, // 3    PBuffer Renderable  Opaque
        QEGL_NO_CONFIG, // 4    Pixmap  Renderable  Translucent
        QEGL_NO_CONFIG, // 5    Pixmap  Renderable  Opaque
        QEGL_NO_CONFIG, // 6    Pixmap  ReadOnly    Translucent
        QEGL_NO_CONFIG  // 7    Pixmap  ReadOnly    Opaque
    };
    if (api == OpenGL) {
        if (devType == QInternal::Widget) {
            if (options & Translucent)
                targetConfig = &(defaultGLConfigs[0]);
            else // Opaque
                targetConfig = &(defaultGLConfigs[1]);
        } else if (devType == QInternal::Pbuffer) {
            if (options & Translucent)
                targetConfig = &(defaultGLConfigs[2]);
            else // Opaque
                targetConfig = &(defaultGLConfigs[3]);
        } else if (devType == QInternal::Pixmap) {
            if (options & Renderable) {
                if (options & Translucent)
                    targetConfig = &(defaultGLConfigs[4]);
                else // Opaque
                    targetConfig = &(defaultGLConfigs[5]);
            } else { // ReadOnly
                if (options & Translucent)
                    targetConfig = &(defaultGLConfigs[6]);
                else // Opaque
                    targetConfig = &(defaultGLConfigs[7]);
            }
        }
    }

    if (!targetConfig) {
        qWarning("QEgl::defaultConfig() - No default config for device/api/options combo");
        return QEGL_NO_CONFIG;
    }
    if (*targetConfig != QEGL_NO_CONFIG)
        return *targetConfig;


    // We haven't found an EGL config for the target config yet, so do it now:


    // Allow overriding from an environment variable:
    QByteArray configId;
    if (api == OpenVG)
        configId = qgetenv("QT_VG_EGL_CONFIG");
    else
        configId = qgetenv("QT_GL_EGL_CONFIG");
    if (!configId.isEmpty()) {
        // Overriden, so get the EGLConfig for the specified config ID:
        EGLint properties[] = {
            EGL_CONFIG_ID, (EGLint)configId.toInt(),
            EGL_NONE
        };
        EGLint configCount = 0;
        eglChooseConfig(display(), properties, targetConfig, 1, &configCount);
        if (configCount > 0)
            return *targetConfig;
        qWarning() << "QEgl::defaultConfig() -" << configId << "appears to be invalid";
    }

    QEglProperties configAttribs;
    configAttribs.setRenderableType(api);

    EGLint surfaceType;
    switch (devType) {
        case QInternal::Widget:
            surfaceType = EGL_WINDOW_BIT;
            break;
        case QInternal::Pixmap:
            surfaceType = EGL_PIXMAP_BIT;
            break;
        case QInternal::Pbuffer:
            surfaceType = EGL_PBUFFER_BIT;
            break;
        default:
            qWarning("QEgl::defaultConfig() - Can't create EGL surface for %d device type", devType);
            return QEGL_NO_CONFIG;
    };
#ifdef EGL_VG_ALPHA_FORMAT_PRE_BIT
    // For OpenVG, we try to create a surface using a pre-multiplied format if
    // the surface needs to have an alpha channel:
    if (api == OpenVG && (options & Translucent))
        surfaceType |= EGL_VG_ALPHA_FORMAT_PRE_BIT;
#endif
    configAttribs.setValue(EGL_SURFACE_TYPE, surfaceType);

#ifdef EGL_BIND_TO_TEXTURE_RGBA
    if (devType == QInternal::Pixmap || devType == QInternal::Pbuffer) {
        if (options & Translucent)
            configAttribs.setValue(EGL_BIND_TO_TEXTURE_RGBA, EGL_TRUE);
        else
            configAttribs.setValue(EGL_BIND_TO_TEXTURE_RGB, EGL_TRUE);
    }
#endif

    // Add paint engine requirements
    if (api == OpenVG) {
#ifndef QVG_SCISSOR_CLIP
        configAttribs.setValue(EGL_ALPHA_MASK_SIZE, 1);
#endif
    } else {
        // Both OpenGL paint engines need to have stencil and sample buffers
        configAttribs.setValue(EGL_STENCIL_SIZE, 1);
        configAttribs.setValue(EGL_SAMPLE_BUFFERS, 1);
#ifndef QT_OPENGL_ES_2
        // Aditionally, the GL1 engine likes to have a depth buffer for clipping
        configAttribs.setValue(EGL_DEPTH_SIZE, 1);
#endif
    }

    if (options & Translucent)
        configAttribs.setValue(EGL_ALPHA_SIZE, 1);

    *targetConfig = chooseConfig(&configAttribs, QEgl::BestPixelFormat);
    return *targetConfig;
}


// Choose a configuration that matches "properties".
EGLConfig QEgl::chooseConfig(const QEglProperties* properties, QEgl::PixelFormatMatch match)
{
    QEglProperties props(*properties);
    EGLConfig cfg = QEGL_NO_CONFIG;
    do {
        // Get the number of matching configurations for this set of properties.
        EGLint matching = 0;
        EGLDisplay dpy = QEgl::display();
        if (!eglChooseConfig(dpy, props.properties(), 0, 0, &matching) || !matching)
            continue;

        // If we want the best pixel format, then return the first
        // matching configuration.
        if (match == QEgl::BestPixelFormat) {
            eglChooseConfig(display(), props.properties(), &cfg, 1, &matching);
            if (matching < 1)
                continue;
            return cfg;
        }

        // Fetch all of the matching configurations and find the
        // first that matches the pixel format we wanted.
        EGLint size = matching;
        EGLConfig *configs = new EGLConfig [size];
        eglChooseConfig(display(), props.properties(), configs, size, &matching);
        for (EGLint index = 0; index < size; ++index) {
            EGLint red, green, blue, alpha;
            eglGetConfigAttrib(display(), configs[index], EGL_RED_SIZE, &red);
            eglGetConfigAttrib(display(), configs[index], EGL_GREEN_SIZE, &green);
            eglGetConfigAttrib(display(), configs[index], EGL_BLUE_SIZE, &blue);
            eglGetConfigAttrib(display(), configs[index], EGL_ALPHA_SIZE, &alpha);
            if (red == props.value(EGL_RED_SIZE) &&
                    green == props.value(EGL_GREEN_SIZE) &&
                    blue == props.value(EGL_BLUE_SIZE) &&
                    (props.value(EGL_ALPHA_SIZE) == 0 ||
                     alpha == props.value(EGL_ALPHA_SIZE))) {
                cfg = configs[index];
                delete [] configs;
                return cfg;
            }
        }
        delete [] configs;
    } while (props.reduceConfiguration());

#ifdef EGL_BIND_TO_TEXTURE_RGBA
    // Don't report an error just yet if we failed to get a pbuffer
    // configuration with texture rendering.  Only report failure if
    // we cannot get any pbuffer configurations at all.
    if (props.value(EGL_BIND_TO_TEXTURE_RGBA) == EGL_DONT_CARE &&
        props.value(EGL_BIND_TO_TEXTURE_RGB) == EGL_DONT_CARE)
#endif
    {
        qWarning() << "QEglContext::chooseConfig(): Could not find a suitable EGL configuration";
        qWarning() << "Requested:" << props.toString();
        qWarning() << "Available:";
        QEgl::dumpAllConfigs();
    }
    return QEGL_NO_CONFIG;
}

bool QEglContext::chooseConfig(const QEglProperties& properties, QEgl::PixelFormatMatch match)
{
    cfg = QEgl::chooseConfig(&properties, match);
    return cfg != QEGL_NO_CONFIG;
}

EGLSurface QEglContext::createSurface(QPaintDevice* device, const QEglProperties *properties)
{
    return QEgl::createSurface(device, cfg, properties);
}


// Create the EGLContext.
bool QEglContext::createContext(QEglContext *shareContext, const QEglProperties *properties)
{
    // We need to select the correct API before calling eglCreateContext().
#ifdef QT_OPENGL_ES
#ifdef EGL_OPENGL_ES_API
    if (apiType == QEgl::OpenGL)
        eglBindAPI(EGL_OPENGL_ES_API);
#endif
#else
#ifdef EGL_OPENGL_API
    if (apiType == QEgl::OpenGL)
        eglBindAPI(EGL_OPENGL_API);
#endif
#endif //defined(QT_OPENGL_ES)
#ifdef EGL_OPENVG_API
    if (apiType == QEgl::OpenVG)
        eglBindAPI(EGL_OPENVG_API);
#endif

    // Create a new context for the configuration.
    QEglProperties contextProps;
    if (properties)
        contextProps = *properties;
#ifdef QT_OPENGL_ES_2
    if (apiType == QEgl::OpenGL)
        contextProps.setValue(EGL_CONTEXT_CLIENT_VERSION, 2);
#endif
    sharing = false;
    if (shareContext && shareContext->ctx == EGL_NO_CONTEXT)
        shareContext = 0;
    if (shareContext) {
        ctx = eglCreateContext(QEgl::display(), cfg, shareContext->ctx, contextProps.properties());
        if (ctx == EGL_NO_CONTEXT) {
            qWarning() << "QEglContext::createContext(): Could not share context:" << QEgl::errorString();
            shareContext = 0;
        } else {
            sharing = true;
        }
    }
    if (ctx == EGL_NO_CONTEXT) {
        ctx = eglCreateContext(display(), cfg, 0, contextProps.properties());
        if (ctx == EGL_NO_CONTEXT) {
            qWarning() << "QEglContext::createContext(): Unable to create EGL context:" << QEgl::errorString();
            return false;
        }
    }
    return true;
}

// Destroy an EGL surface object.  If it was current on this context
// then call doneCurrent() for it first.
void QEglContext::destroySurface(EGLSurface surface)
{
    if (surface != EGL_NO_SURFACE) {
        if (surface == currentSurface)
            doneCurrent();
        eglDestroySurface(display(), surface);
    }
}

// Destroy the context.  Note: this does not destroy the surface.
void QEglContext::destroyContext()
{
    if (ctx != EGL_NO_CONTEXT && ownsContext)
        eglDestroyContext(display(), ctx);
    ctx = EGL_NO_CONTEXT;
    cfg = 0;
}

bool QEglContext::makeCurrent(EGLSurface surface)
{
    if (ctx == EGL_NO_CONTEXT) {
        qWarning() << "QEglContext::makeCurrent(): Cannot make invalid context current";
        return false;
    }

    if (surface == EGL_NO_SURFACE) {
        qWarning() << "QEglContext::makeCurrent(): Cannot make invalid surface current";
        return false;
    }

    // If lazyDoneCurrent() was called on the surface, then we may be able
    // to assume that it is still current within the thread.
    if (surface == currentSurface && currentContext(apiType) == this) {
        current = true;
        return true;
    }

    current = true;
    currentSurface = surface;
    setCurrentContext(apiType, this);

    // Force the right API to be bound before making the context current.
    // The EGL implementation should be able to figure this out from ctx,
    // but some systems require the API to be explicitly set anyway.
#ifdef EGL_OPENGL_ES_API
    if (apiType == QEgl::OpenGL)
        eglBindAPI(EGL_OPENGL_ES_API);
#endif
#ifdef EGL_OPENVG_API
    if (apiType == QEgl::OpenVG)
        eglBindAPI(EGL_OPENVG_API);
#endif

    bool ok = eglMakeCurrent(QEgl::display(), surface, surface, ctx);
    if (!ok)
        qWarning() << "QEglContext::makeCurrent(" << surface << "):" << QEgl::errorString();
    return ok;
}

bool QEglContext::doneCurrent()
{
    // If the context is invalid, we assume that an error was reported
    // when makeCurrent() was called.
    if (ctx == EGL_NO_CONTEXT)
        return false;

    current = false;
    currentSurface = EGL_NO_SURFACE;
    setCurrentContext(apiType, 0);

    // We need to select the correct API before calling eglMakeCurrent()
    // with EGL_NO_CONTEXT because threads can have both OpenGL and OpenVG
    // contexts active at the same time.
#ifdef EGL_OPENGL_ES_API
    if (apiType == QEgl::OpenGL)
        eglBindAPI(EGL_OPENGL_ES_API);
#endif
#ifdef EGL_OPENVG_API
    if (apiType == QEgl::OpenVG)
        eglBindAPI(EGL_OPENVG_API);
#endif

    bool ok = eglMakeCurrent(QEgl::display(), EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
    if (!ok)
        qWarning() << "QEglContext::doneCurrent():" << QEgl::errorString();
    return ok;
}

// Act as though doneCurrent() was called, but keep the context
// and the surface active for the moment.  This allows makeCurrent()
// to skip a call to eglMakeCurrent() if we are using the same
// surface as the last set of painting operations.  We leave the
// currentContext() pointer as-is for now.
bool QEglContext::lazyDoneCurrent()
{
    current = false;
    return true;
}

bool QEglContext::swapBuffers(EGLSurface surface)
{
    if(ctx == EGL_NO_CONTEXT)
        return false;

    bool ok = eglSwapBuffers(QEgl::display(), surface);
    if (!ok)
        qWarning() << "QEglContext::swapBuffers():" << QEgl::errorString();
    return ok;
}

int QEglContext::configAttrib(int name) const
{
    EGLint value;
    EGLBoolean success = eglGetConfigAttrib(QEgl::display(), cfg, name, &value);
    if (success)
        return value;
    else
        return EGL_DONT_CARE;
}

typedef EGLImageKHR (EGLAPIENTRY *_eglCreateImageKHR)(EGLDisplay, EGLContext, EGLenum, EGLClientBuffer, const EGLint*);
typedef EGLBoolean (EGLAPIENTRY *_eglDestroyImageKHR)(EGLDisplay, EGLImageKHR);

// Defined in qegl.cpp:
static _eglCreateImageKHR qt_eglCreateImageKHR = 0;
static _eglDestroyImageKHR qt_eglDestroyImageKHR = 0;


EGLDisplay QEgl::display()
{
    static EGLDisplay dpy = EGL_NO_DISPLAY;
    if (!QEglContextTracker::displayOpened()) {
        dpy = eglGetDisplay(nativeDisplay());
        QEglContextTracker::setDisplayOpened();
        if (dpy == EGL_NO_DISPLAY) {
            qWarning("QEgl::display(): Falling back to EGL_DEFAULT_DISPLAY");
            dpy = eglGetDisplay(EGLNativeDisplayType(EGL_DEFAULT_DISPLAY));
        }
        if (dpy == EGL_NO_DISPLAY) {
            qWarning("QEgl::display(): Can't even open the default display");
            return EGL_NO_DISPLAY;
        }

        if (!eglInitialize(dpy, NULL, NULL)) {
            qWarning() << "QEgl::display(): Cannot initialize EGL display:" << QEgl::errorString();
            return EGL_NO_DISPLAY;
        }

        // Resolve the egl extension function pointers:
#if (defined(EGL_KHR_image) || defined(EGL_KHR_image_base)) && !defined(EGL_EGLEXT_PROTOTYPES)
        if (QEgl::hasExtension("EGL_KHR_image") || QEgl::hasExtension("EGL_KHR_image_base")) {
            qt_eglCreateImageKHR = (_eglCreateImageKHR) eglGetProcAddress("eglCreateImageKHR");
            qt_eglDestroyImageKHR = (_eglDestroyImageKHR) eglGetProcAddress("eglDestroyImageKHR");
        }
#endif
    }

    return dpy;
}

EGLImageKHR QEgl::eglCreateImageKHR(EGLDisplay dpy, EGLContext ctx, EGLenum target, EGLClientBuffer buffer, const EGLint *attrib_list)
{
    if (qt_eglCreateImageKHR)
        return qt_eglCreateImageKHR(dpy, ctx, target, buffer, attrib_list);

    QEgl::display(); // Initialises function pointers
    if (qt_eglCreateImageKHR)
        return qt_eglCreateImageKHR(dpy, ctx, target, buffer, attrib_list);

    qWarning("QEgl::eglCreateImageKHR() called but EGL_KHR_image(_base) extension not present");
    return 0;
}

EGLBoolean QEgl::eglDestroyImageKHR(EGLDisplay dpy, EGLImageKHR img)
{
    if (qt_eglDestroyImageKHR)
        return qt_eglDestroyImageKHR(dpy, img);

    QEgl::display(); // Initialises function pointers
    if (qt_eglDestroyImageKHR)
        return qt_eglDestroyImageKHR(dpy, img);

    qWarning("QEgl::eglDestroyImageKHR() called but EGL_KHR_image(_base) extension not present");
    return 0;
}


#ifndef Q_WS_X11
EGLSurface QEgl::createSurface(QPaintDevice *device, EGLConfig cfg, const QEglProperties *properties)
{
    // Create the native drawable for the paint device.
    int devType = device->devType();
    EGLNativePixmapType pixmapDrawable = 0;
    EGLNativeWindowType windowDrawable = 0;
    bool ok;
    if (devType == QInternal::Pixmap) {
        pixmapDrawable = nativePixmap(static_cast<QPixmap *>(device));
        ok = (pixmapDrawable != 0);
    } else if (devType == QInternal::Widget) {
        windowDrawable = nativeWindow(static_cast<QWidget *>(device));
        ok = (windowDrawable != 0);
    } else {
        ok = false;
    }
    if (!ok) {
        qWarning("QEglContext::createSurface(): Cannot create the native EGL drawable");
        return EGL_NO_SURFACE;
    }

    // Create the EGL surface to draw into, based on the native drawable.
    const int *props;
    if (properties)
        props = properties->properties();
    else
        props = 0;
    EGLSurface surf;
    if (devType == QInternal::Widget)
        surf = eglCreateWindowSurface(QEgl::display(), cfg, windowDrawable, props);
    else
        surf = eglCreatePixmapSurface(QEgl::display(), cfg, pixmapDrawable, props);
    if (surf == EGL_NO_SURFACE) {
        qWarning("QEglContext::createSurface(): Unable to create EGL surface, error = 0x%x", eglGetError());
    }
    return surf;
}
#endif


// Return the error string associated with a specific code.
QString QEgl::errorString(EGLint code)
{
    static const char * const errors[] = {
        "Success (0x3000)",                 // No tr
        "Not initialized (0x3001)",         // No tr
        "Bad access (0x3002)",              // No tr
        "Bad alloc (0x3003)",               // No tr
        "Bad attribute (0x3004)",           // No tr
        "Bad config (0x3005)",              // No tr
        "Bad context (0x3006)",             // No tr
        "Bad current surface (0x3007)",     // No tr
        "Bad display (0x3008)",             // No tr
        "Bad match (0x3009)",               // No tr
        "Bad native pixmap (0x300A)",       // No tr
        "Bad native window (0x300B)",       // No tr
        "Bad parameter (0x300C)",           // No tr
        "Bad surface (0x300D)",             // No tr
        "Context lost (0x300E)"             // No tr
    };
    if (code >= 0x3000 && code <= 0x300E) {
        return QString::fromLatin1(errors[code - 0x3000]);
    } else {
        return QLatin1String("0x") + QString::number(int(code), 16);
    }
}

// Dump all of the EGL configurations supported by the system.
void QEgl::dumpAllConfigs()
{
    QEglProperties props;
    EGLint count = 0;
    if (!eglGetConfigs(display(), 0, 0, &count) || count < 1)
        return;
    EGLConfig *configs = new EGLConfig [count];
    eglGetConfigs(display(), configs, count, &count);
    for (EGLint index = 0; index < count; ++index) {
        props = QEglProperties(configs[index]);
        qWarning() << props.toString();
    }
    delete [] configs;
}

QString QEgl::extensions()
{
    const char* exts = eglQueryString(QEgl::display(), EGL_EXTENSIONS);
    return QString(QLatin1String(exts));
}

bool QEgl::hasExtension(const char* extensionName)
{
    QList<QByteArray> extensions =
        QByteArray(reinterpret_cast<const char *>
            (eglQueryString(QEgl::display(), EGL_EXTENSIONS))).split(' ');
    return extensions.contains(extensionName);
}

QEglContext *QEglContext::currentContext(QEgl::API api)
{
    if (api == QEgl::OpenGL)
        return currentGLContext;
    else
        return currentVGContext;
}

void QEglContext::setCurrentContext(QEgl::API api, QEglContext *context)
{
    if (api == QEgl::OpenGL)
        currentGLContext = context;
    else
        currentVGContext = context;
}

QT_END_NAMESPACE