summaryrefslogtreecommitdiff
path: root/src/hardwareintegration/client/wayland-egl/qwaylandglcontext.cpp
blob: c1f45fa69d05690665a0028eb9283c2cd4a3806b (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
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qwaylandglcontext.h"

#include <QtWaylandClient/private/qwaylanddisplay_p.h>
#include <QtWaylandClient/private/qwaylandwindow_p.h>
#include <QtWaylandClient/private/qwaylandsubsurface_p.h>
#include <QtWaylandClient/private/qwaylandabstractdecoration_p.h>
#include <QtWaylandClient/private/qwaylandintegration_p.h>
#include "qwaylandeglwindow.h"

#include <QDebug>
#include <QtEglSupport/private/qeglconvenience_p.h>
#include <QtGui/private/qopenglcontext_p.h>
#include <QtGui/private/qopengltexturecache_p.h>
#include <QtGui/private/qguiapplication_p.h>

#include <qpa/qplatformopenglcontext.h>
#include <QtGui/QSurfaceFormat>
#include <QtGui/QOpenGLShaderProgram>
#include <QtGui/QOpenGLFunctions>
#include <QOpenGLBuffer>

#include <QtCore/qmutex.h>

#include <dlfcn.h>

// Constants from EGL_KHR_create_context
#ifndef EGL_CONTEXT_MINOR_VERSION_KHR
#define EGL_CONTEXT_MINOR_VERSION_KHR 0x30FB
#endif
#ifndef EGL_CONTEXT_FLAGS_KHR
#define EGL_CONTEXT_FLAGS_KHR 0x30FC
#endif
#ifndef EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR
#define EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR 0x30FD
#endif
#ifndef EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR
#define EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR 0x00000001
#endif
#ifndef EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR
#define EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR 0x00000002
#endif
#ifndef EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT_KHR
#define EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT_KHR 0x00000001
#endif
#ifndef EGL_CONTEXT_OPENGL_COMPATIBILITY_PROFILE_BIT_KHR
#define EGL_CONTEXT_OPENGL_COMPATIBILITY_PROFILE_BIT_KHR 0x00000002
#endif

// Constants for OpenGL which are not available in the ES headers.
#ifndef GL_CONTEXT_FLAGS
#define GL_CONTEXT_FLAGS 0x821E
#endif
#ifndef GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT
#define GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT 0x0001
#endif
#ifndef GL_CONTEXT_FLAG_DEBUG_BIT
#define GL_CONTEXT_FLAG_DEBUG_BIT 0x00000002
#endif
#ifndef GL_CONTEXT_PROFILE_MASK
#define GL_CONTEXT_PROFILE_MASK 0x9126
#endif
#ifndef GL_CONTEXT_CORE_PROFILE_BIT
#define GL_CONTEXT_CORE_PROFILE_BIT 0x00000001
#endif
#ifndef GL_CONTEXT_COMPATIBILITY_PROFILE_BIT
#define GL_CONTEXT_COMPATIBILITY_PROFILE_BIT 0x00000002
#endif

QT_BEGIN_NAMESPACE

namespace QtWaylandClient {

class DecorationsBlitter : public QOpenGLFunctions
{
public:
    DecorationsBlitter(QWaylandGLContext *context)
        : m_context(context)
    {
        initializeOpenGLFunctions();
        m_blitProgram = new QOpenGLShaderProgram();
        m_blitProgram->addShaderFromSourceCode(QOpenGLShader::Vertex, "attribute vec4 position;\n\
                                                                    attribute vec4 texCoords;\n\
                                                                    varying vec2 outTexCoords;\n\
                                                                    void main()\n\
                                                                    {\n\
                                                                        gl_Position = position;\n\
                                                                        outTexCoords = texCoords.xy;\n\
                                                                    }");
        m_blitProgram->addShaderFromSourceCode(QOpenGLShader::Fragment, "varying highp vec2 outTexCoords;\n\
                                                                        uniform sampler2D texture;\n\
                                                                        void main()\n\
                                                                        {\n\
                                                                            gl_FragColor = texture2D(texture, outTexCoords);\n\
                                                                        }");

        m_blitProgram->bindAttributeLocation("position", 0);
        m_blitProgram->bindAttributeLocation("texCoords", 1);

        if (!m_blitProgram->link()) {
            qDebug() << "Shader Program link failed.";
            qDebug() << m_blitProgram->log();
        }

        m_blitProgram->bind();
        m_blitProgram->enableAttributeArray(0);
        m_blitProgram->enableAttributeArray(1);

        glDisable(GL_DEPTH_TEST);
        glDisable(GL_BLEND);
        glDisable(GL_CULL_FACE);
        glDisable(GL_SCISSOR_TEST);
        glDepthMask(GL_FALSE);
        glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);

        m_buffer.create();
        m_buffer.bind();

        static const GLfloat squareVertices[] = {
            -1.f, -1.f,
            1.0f, -1.f,
            -1.f,  1.0f,
            1.0f,  1.0f
        };
        static const GLfloat inverseSquareVertices[] = {
            -1.f, 1.f,
            1.f, 1.f,
            -1.f, -1.f,
            1.f, -1.f
        };
        static const GLfloat textureVertices[] = {
            0.0f,  0.0f,
            1.0f,  0.0f,
            0.0f,  1.0f,
            1.0f,  1.0f,
        };

        m_squareVerticesOffset = 0;
        m_inverseSquareVerticesOffset = sizeof(squareVertices);
        m_textureVerticesOffset = sizeof(squareVertices) + sizeof(textureVertices);

        m_buffer.allocate(sizeof(squareVertices) + sizeof(inverseSquareVertices) + sizeof(textureVertices));
        m_buffer.write(m_squareVerticesOffset, squareVertices, sizeof(squareVertices));
        m_buffer.write(m_inverseSquareVerticesOffset, inverseSquareVertices, sizeof(inverseSquareVertices));
        m_buffer.write(m_textureVerticesOffset, textureVertices, sizeof(textureVertices));

        m_blitProgram->setAttributeBuffer(1, GL_FLOAT, m_textureVerticesOffset, 2);

        m_textureWrap = m_context->context()->functions()->hasOpenGLFeature(QOpenGLFunctions::NPOTTextureRepeat) ? GL_REPEAT : GL_CLAMP_TO_EDGE;
    }
    ~DecorationsBlitter()
    {
        delete m_blitProgram;
    }
    void blit(QWaylandEglWindow *window)
    {
        QOpenGLTextureCache *cache = QOpenGLTextureCache::cacheForContext(m_context->context());

        QSize surfaceSize = window->surfaceSize();
        int scale = window->scale() ;
        glViewport(0, 0, surfaceSize.width() * scale, surfaceSize.height() * scale);

        //Draw Decoration
        m_blitProgram->setAttributeBuffer(0, GL_FLOAT, m_inverseSquareVerticesOffset, 2);
        QImage decorationImage = window->decoration()->contentImage();
        cache->bindTexture(m_context->context(), decorationImage);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, m_textureWrap);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, m_textureWrap);
        glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);

        //Draw Content
        m_blitProgram->setAttributeBuffer(0, GL_FLOAT, m_squareVerticesOffset, 2);
        glBindTexture(GL_TEXTURE_2D, window->contentTexture());
        QRect r = window->contentsRect();
        glViewport(r.x() * scale, r.y() * scale, r.width() * scale, r.height() * scale);
        glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
    }

    QOpenGLShaderProgram *m_blitProgram = nullptr;
    QWaylandGLContext *m_context = nullptr;
    QOpenGLBuffer m_buffer;
    int m_squareVerticesOffset;
    int m_inverseSquareVerticesOffset;
    int m_textureVerticesOffset;
    int m_textureWrap;
};



QWaylandGLContext::QWaylandGLContext(EGLDisplay eglDisplay, QWaylandDisplay *display, const QSurfaceFormat &format, QPlatformOpenGLContext *share)
    : QPlatformOpenGLContext()
    , m_eglDisplay(eglDisplay)
    , m_display(display)
{
    QSurfaceFormat fmt = format;
    if (static_cast<QWaylandIntegration *>(QGuiApplicationPrivate::platformIntegration())->display()->supportsWindowDecoration())
        fmt.setAlphaBufferSize(8);
    m_config = q_configFromGLFormat(m_eglDisplay, fmt);
    m_format = q_glFormatFromConfig(m_eglDisplay, m_config, fmt);
    m_shareEGLContext = share ? static_cast<QWaylandGLContext *>(share)->eglContext() : EGL_NO_CONTEXT;

    QVector<EGLint> eglContextAttrs;
    eglContextAttrs.append(EGL_CONTEXT_CLIENT_VERSION);
    eglContextAttrs.append(format.majorVersion());
    const bool hasKHRCreateContext = q_hasEglExtension(m_eglDisplay, "EGL_KHR_create_context");
    if (hasKHRCreateContext) {
        eglContextAttrs.append(EGL_CONTEXT_MINOR_VERSION_KHR);
        eglContextAttrs.append(format.minorVersion());
        int flags = 0;
        // The debug bit is supported both for OpenGL and OpenGL ES.
        if (format.testOption(QSurfaceFormat::DebugContext))
            flags |= EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR;
        // The fwdcompat bit is only for OpenGL 3.0+.
        if (m_format.renderableType() == QSurfaceFormat::OpenGL
            && format.majorVersion() >= 3
            && !format.testOption(QSurfaceFormat::DeprecatedFunctions))
            flags |= EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR;
        if (flags) {
            eglContextAttrs.append(EGL_CONTEXT_FLAGS_KHR);
            eglContextAttrs.append(flags);
        }
        // Profiles are OpenGL only and mandatory in 3.2+. The value is silently ignored for < 3.2.
        if (m_format.renderableType() == QSurfaceFormat::OpenGL) {
            switch (format.profile()) {
            case QSurfaceFormat::NoProfile:
                break;
            case QSurfaceFormat::CoreProfile:
                eglContextAttrs.append(EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR);
                eglContextAttrs.append(EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT_KHR);
                break;
            case QSurfaceFormat::CompatibilityProfile:
                eglContextAttrs.append(EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR);
                eglContextAttrs.append(EGL_CONTEXT_OPENGL_COMPATIBILITY_PROFILE_BIT_KHR);
                break;
            }
        }
    }
    eglContextAttrs.append(EGL_NONE);

    switch (m_format.renderableType()) {
    case QSurfaceFormat::OpenVG:
        m_api = EGL_OPENVG_API;
        break;
#ifdef EGL_VERSION_1_4
#  if !defined(QT_OPENGL_ES_2)
    case QSurfaceFormat::DefaultRenderableType:
#  endif
    case QSurfaceFormat::OpenGL:
        m_api = EGL_OPENGL_API;
        break;
#endif
    case QSurfaceFormat::OpenGLES:
    default:
        m_api = EGL_OPENGL_ES_API;
        break;
    }
    eglBindAPI(m_api);

    m_context = eglCreateContext(m_eglDisplay, m_config, m_shareEGLContext, eglContextAttrs.constData());

    if (m_context == EGL_NO_CONTEXT) {
        m_context = eglCreateContext(m_eglDisplay, m_config, EGL_NO_CONTEXT, eglContextAttrs.constData());
        m_shareEGLContext = EGL_NO_CONTEXT;
    }

    EGLint error = eglGetError();
    if (error != EGL_SUCCESS) {
        qWarning("QWaylandGLContext: failed to create EGLContext, error=%x", error);
        return;
    }

    // Create an EGL context for the decorations blitter. By using a dedicated context we don't need to make sure to not
    // change the context state and we also use OpenGL ES 2 API independently to what the app is using to draw.
    QVector<EGLint> eglDecorationsContextAttrs = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
    m_decorationsContext = eglCreateContext(m_eglDisplay, m_config, m_context, eglDecorationsContextAttrs.constData());
    if (m_decorationsContext == EGL_NO_CONTEXT)
        qWarning("QWaylandGLContext: Failed to create the decorations EGLContext. Decorations will not be drawn.");

    EGLint a = EGL_MIN_SWAP_INTERVAL;
    EGLint b = EGL_MAX_SWAP_INTERVAL;
    if (!eglGetConfigAttrib(m_eglDisplay, m_config, a, &a) ||
        !eglGetConfigAttrib(m_eglDisplay, m_config, b, &b) ||
        a > 0) {
       m_supportNonBlockingSwap = false;
    }
    {
        bool ok;
        int supportNonBlockingSwap = qEnvironmentVariableIntValue("QT_WAYLAND_FORCE_NONBLOCKING_SWAP_SUPPORT", &ok);
        if (ok)
            m_supportNonBlockingSwap = supportNonBlockingSwap != 0;
    }
    if (!m_supportNonBlockingSwap) {
        qWarning(lcQpaWayland) << "Non-blocking swap buffers not supported."
                               << "Subsurface rendering can be affected."
                               << "It may also cause the event loop to freeze in some situations";
    }

    m_supportSurfaceLessContext = q_hasEglExtension(m_eglDisplay, "EGL_KHR_surfaceless_context");

    updateGLFormat();
}

void QWaylandGLContext::updateGLFormat()
{
    // Have to save & restore to prevent QOpenGLContext::currentContext() from becoming
    // inconsistent after QOpenGLContext::create().
    EGLDisplay prevDisplay = eglGetCurrentDisplay();
    if (prevDisplay == EGL_NO_DISPLAY) // when no context is current
        prevDisplay = m_eglDisplay;
    EGLContext prevContext = eglGetCurrentContext();
    EGLSurface prevSurfaceDraw = eglGetCurrentSurface(EGL_DRAW);
    EGLSurface prevSurfaceRead = eglGetCurrentSurface(EGL_READ);

    wl_surface *wlSurface = m_display->createSurface(nullptr);
    wl_egl_window *eglWindow = wl_egl_window_create(wlSurface, 1, 1);
#if QT_CONFIG(egl_extension_platform_wayland)
    EGLSurface eglSurface = eglCreatePlatformWindowSurface(m_eglDisplay, m_config, eglWindow, nullptr);
#else
    EGLSurface eglSurface = eglCreateWindowSurface(m_eglDisplay, m_config, eglWindow, nullptr);
#endif

    if (eglMakeCurrent(m_eglDisplay, eglSurface, eglSurface, m_context)) {
        if (m_format.renderableType() == QSurfaceFormat::OpenGL
            || m_format.renderableType() == QSurfaceFormat::OpenGLES) {
            const GLubyte *s = glGetString(GL_VERSION);
            if (s) {
                QByteArray version = QByteArray(reinterpret_cast<const char *>(s));
                int major, minor;
                if (QPlatformOpenGLContext::parseOpenGLVersion(version, major, minor)) {
                    m_format.setMajorVersion(major);
                    m_format.setMinorVersion(minor);
                }
            }
            m_format.setProfile(QSurfaceFormat::NoProfile);
            m_format.setOptions(QSurfaceFormat::FormatOptions());
            if (m_format.renderableType() == QSurfaceFormat::OpenGL) {
                // Check profile and options.
                if (m_format.majorVersion() < 3) {
                    m_format.setOption(QSurfaceFormat::DeprecatedFunctions);
                } else {
                    GLint value = 0;
                    glGetIntegerv(GL_CONTEXT_FLAGS, &value);
                    if (!(value & GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT))
                        m_format.setOption(QSurfaceFormat::DeprecatedFunctions);
                    if (value & GL_CONTEXT_FLAG_DEBUG_BIT)
                        m_format.setOption(QSurfaceFormat::DebugContext);
                    if (m_format.version() >= qMakePair(3, 2)) {
                        value = 0;
                        glGetIntegerv(GL_CONTEXT_PROFILE_MASK, &value);
                        if (value & GL_CONTEXT_CORE_PROFILE_BIT)
                            m_format.setProfile(QSurfaceFormat::CoreProfile);
                        else if (value & GL_CONTEXT_COMPATIBILITY_PROFILE_BIT)
                            m_format.setProfile(QSurfaceFormat::CompatibilityProfile);
                    }
                }
            }
        }
        eglMakeCurrent(prevDisplay, prevSurfaceDraw, prevSurfaceRead, prevContext);
    }
    eglDestroySurface(m_eglDisplay, eglSurface);
    wl_egl_window_destroy(eglWindow);
    wl_surface_destroy(wlSurface);
}

QWaylandGLContext::~QWaylandGLContext()
{
    delete m_blitter;
    if (m_decorationsContext != EGL_NO_CONTEXT)
        eglDestroyContext(m_eglDisplay, m_decorationsContext);
    eglDestroyContext(m_eglDisplay, m_context);
}

bool QWaylandGLContext::makeCurrent(QPlatformSurface *surface)
{
    // in QWaylandGLContext() we called eglBindAPI with the correct value. However,
    // eglBindAPI's documentation says:
    // "eglBindAPI defines the current rendering API for EGL in the thread it is called from"
    // Since makeCurrent() can be called from a different thread than the one we created the
    // context in make sure to call eglBindAPI in the correct thread.
    if (eglQueryAPI() != m_api) {
        eglBindAPI(m_api);
    }

    QWaylandEglWindow *window = static_cast<QWaylandEglWindow *>(surface);
    EGLSurface eglSurface = window->eglSurface();

    if (!window->needToUpdateContentFBO() && (eglSurface != EGL_NO_SURFACE)) {
        if (!eglMakeCurrent(m_eglDisplay, eglSurface, eglSurface, m_context)) {
            qWarning("QWaylandGLContext::makeCurrent: eglError: %x, this: %p \n", eglGetError(), this);
            return false;
        }
        return true;
    }

    if (window->isExposed())
        window->setCanResize(false);
    if (m_decorationsContext != EGL_NO_CONTEXT && !window->decoration())
        window->createDecoration();

    if (eglSurface == EGL_NO_SURFACE) {
        window->updateSurface(true);
        eglSurface = window->eglSurface();
    }

    if (eglSurface == EGL_NO_SURFACE && m_supportSurfaceLessContext) {
        return false;
    }

    if (!eglMakeCurrent(m_eglDisplay, eglSurface, eglSurface, m_context)) {
        qWarning("QWaylandGLContext::makeCurrent: eglError: %x, this: %p \n", eglGetError(), this);
        window->setCanResize(true);
        return false;
    }

    //### setCurrentContext will be called in QOpenGLContext::makeCurrent after this function
    // returns, but that's too late, as we need a current context in order to bind the content FBO.
    QOpenGLContextPrivate::setCurrentContext(context());
    window->bindContentFBO();

    return true;
}

void QWaylandGLContext::doneCurrent()
{
    eglMakeCurrent(m_eglDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
}

void QWaylandGLContext::swapBuffers(QPlatformSurface *surface)
{
    QWaylandEglWindow *window = static_cast<QWaylandEglWindow *>(surface);

    EGLSurface eglSurface = window->eglSurface();

    if (window->decoration()) {
        if (m_api != EGL_OPENGL_ES_API)
            eglBindAPI(EGL_OPENGL_ES_API);

        // save the current EGL content and surface to set it again after the blitter is done
        EGLDisplay currentDisplay = eglGetCurrentDisplay();
        EGLContext currentContext = eglGetCurrentContext();
        EGLSurface currentSurfaceDraw = eglGetCurrentSurface(EGL_DRAW);
        EGLSurface currentSurfaceRead = eglGetCurrentSurface(EGL_READ);
        eglMakeCurrent(m_eglDisplay, eglSurface, eglSurface, m_decorationsContext);

        if (!m_blitter)
            m_blitter = new DecorationsBlitter(this);
        m_blitter->blit(window);

        if (m_api != EGL_OPENGL_ES_API)
            eglBindAPI(m_api);
        eglMakeCurrent(currentDisplay, currentSurfaceDraw, currentSurfaceRead, currentContext);
    }

    int swapInterval = m_supportNonBlockingSwap ? 0 : m_format.swapInterval();
    eglSwapInterval(m_eglDisplay, swapInterval);
    if (swapInterval == 0 && m_format.swapInterval() > 0) {
        // Emulating a blocking swap
        glFlush(); // Flush before waiting so we can swap more quickly when the frame event arrives
        window->waitForFrameSync(100);
    }
    window->handleUpdate();
    eglSwapBuffers(m_eglDisplay, eglSurface);

    window->setCanResize(true);
}

GLuint QWaylandGLContext::defaultFramebufferObject(QPlatformSurface *surface) const
{
    return static_cast<QWaylandEglWindow *>(surface)->contentFBO();
}

bool QWaylandGLContext::isSharing() const
{
    return m_shareEGLContext != EGL_NO_CONTEXT;
}

bool QWaylandGLContext::isValid() const
{
    return m_context != EGL_NO_CONTEXT;
}

QFunctionPointer QWaylandGLContext::getProcAddress(const char *procName)
{
    QFunctionPointer proc = (QFunctionPointer) eglGetProcAddress(procName);
    if (!proc)
        proc = (QFunctionPointer) dlsym(RTLD_DEFAULT, procName);
    return proc;
}

EGLConfig QWaylandGLContext::eglConfig() const
{
    return m_config;
}

}

QT_END_NAMESPACE