1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** GNU Lesser General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU Lesser
19** General Public License version 3 as published by the Free Software
20** Foundation and appearing in the file LICENSE.LGPL3 included in the
21** packaging of this file. Please review the following information to
22** ensure the GNU Lesser General Public License version 3 requirements
23** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
24**
25** GNU General Public License Usage
26** Alternatively, this file may be used under the terms of the GNU
27** General Public License version 2.0 or (at your option) the GNU General
28** Public license version 3 or any later version approved by the KDE Free
29** Qt Foundation. The licenses are as published by the Free Software
30** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
31** included in the packaging of this file. Please review the following
32** information to ensure the GNU General Public License requirements will
33** be met: https://www.gnu.org/licenses/gpl-2.0.html and
34** https://www.gnu.org/licenses/gpl-3.0.html.
35**
36** $QT_END_LICENSE$
37**
38****************************************************************************/
39
40#ifndef QMEDIAOPENGLHELPER_P_H
41#define QMEDIAOPENGLHELPER_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists purely as an
48// implementation detail. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include <QtGui/QOpenGLContext>
55
56#if defined(Q_OS_WIN) && !defined(Q_OS_WINRT) && (defined(QT_OPENGL_ES_2) || defined(QT_OPENGL_DYNAMIC))
57#include <EGL/egl.h>
58#endif
59
60QT_BEGIN_NAMESPACE
61
62class QMediaOpenGLHelper
63{
64public:
65 static bool isANGLE();
66};
67
68inline bool QMediaOpenGLHelper::isANGLE()
69{
70#ifdef Q_OS_WINRT
71 return true;
72#else
73 bool isANGLE = false;
74
75# if defined(Q_OS_WIN) && (defined(QT_OPENGL_ES_2) || defined(QT_OPENGL_DYNAMIC))
76 if (QOpenGLContext::openGLModuleType() == QOpenGLContext::LibGLES) {
77 // Although unlikely, technically LibGLES could mean a non-ANGLE EGL/GLES2 implementation too.
78 // Verify that it is indeed ANGLE.
79# ifdef QT_OPENGL_ES_2_ANGLE_STATIC
80 // ANGLE linked-in statically.
81 isANGLE = true;
82# else
83 // Qt configured with either -opengl es2 or -opengl desktop.
84# ifdef QT_DEBUG
85 HMODULE eglHandle = LoadLibraryW(L"libEGLd.dll");
86# else
87 HMODULE eglHandle = LoadLibraryW(L"libEGL.dll");
88# endif // QT_DEBUG
89 if (eglHandle) {
90 typedef EGLDisplay (EGLAPIENTRYP EglGetDisplay)(EGLNativeDisplayType display_id);
91 typedef EGLBoolean (EGLAPIENTRYP EglInitialize)(EGLDisplay dpy, EGLint *major, EGLint *minor);
92 typedef const char * (EGLAPIENTRYP EglQueryString)(EGLDisplay dpy, EGLint name);
93 EglGetDisplay eglGetDisplay = (EglGetDisplay) GetProcAddress(eglHandle, "eglGetDisplay");
94 EglInitialize eglInitialize = (EglInitialize) GetProcAddress(eglHandle, "eglInitialize");
95 EglQueryString eglQueryString = (EglQueryString) GetProcAddress(eglHandle, "eglQueryString");
96 if (eglGetDisplay && eglInitialize && eglQueryString) {
97 // EGL may not be initialized at this stage.
98 EGLDisplay dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
99 eglInitialize(dpy, 0, 0);
100 const char *vendorStr = eglQueryString(dpy, EGL_VERSION);
101 isANGLE = vendorStr && strstr(vendorStr, "ANGLE");
102 }
103 }
104# endif // QT_OPENGL_ES_2_ANGLE_STATIC
105
106 }
107# endif // Q_OS_WIN && (QT_OPENGL_ES_2 || QT_OPENGL_DYNAMIC)
108
109 return isANGLE;
110#endif // Q_OS_WINRT
111}
112
113QT_END_NAMESPACE
114
115#endif
116

source code of qtmultimedia/src/multimedia/qmediaopenglhelper_p.h