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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