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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 Data Visualization module of the Qt Toolkit. |
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8 | ** $QT_BEGIN_LICENSE:GPL$ |
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19 | ** General Public License version 3 or (at your option) any later version |
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28 | ****************************************************************************/ |
29 | |
30 | #ifndef QUTILS_H |
31 | #define QUTILS_H |
32 | |
33 | #include <QtGui/QSurfaceFormat> |
34 | #include <QtGui/QOpenGLContext> |
35 | #include <QtGui/QOpenGLFunctions> |
36 | #include <QtGui/QOffscreenSurface> |
37 | #include <QtCore/QCoreApplication> |
38 | |
39 | namespace QtDataVisualization { |
40 | |
41 | #ifndef Q_QDOC |
42 | static inline QSurfaceFormat qDefaultSurfaceFormat(bool antialias = true) Q_DECL_UNUSED; |
43 | #endif |
44 | static inline QSurfaceFormat qDefaultSurfaceFormat(bool antialias) |
45 | { |
46 | bool isES = false; |
47 | |
48 | QSurfaceFormat surfaceFormat; |
49 | |
50 | // Common attributes |
51 | surfaceFormat.setDepthBufferSize(24); |
52 | surfaceFormat.setStencilBufferSize(8); |
53 | surfaceFormat.setSwapBehavior(QSurfaceFormat::DoubleBuffer); |
54 | surfaceFormat.setRenderableType(QSurfaceFormat::DefaultRenderableType); |
55 | |
56 | QOpenGLContext *ctx = QOpenGLContext::currentContext(); |
57 | QOffscreenSurface *dummySurface = nullptr; |
58 | if (!ctx) { |
59 | dummySurface = new QOffscreenSurface(); |
60 | dummySurface->setFormat(surfaceFormat); |
61 | dummySurface->create(); |
62 | ctx = new QOpenGLContext; |
63 | ctx->setFormat(surfaceFormat); |
64 | ctx->create(); |
65 | ctx->makeCurrent(surface: dummySurface); |
66 | } |
67 | |
68 | #if defined(QT_OPENGL_ES_2) |
69 | isES = true; |
70 | #elif (QT_VERSION < QT_VERSION_CHECK(5, 3, 0)) |
71 | isES = false; |
72 | #else |
73 | isES = ctx->isOpenGLES(); |
74 | #endif |
75 | |
76 | #if (QT_VERSION >= QT_VERSION_CHECK(5, 4, 0)) |
77 | // We support only ES2 emulation with software renderer for now |
78 | QString versionStr; |
79 | #ifdef Q_OS_WIN |
80 | const GLubyte *openGLVersion = ctx->functions()->glGetString(GL_VERSION); |
81 | versionStr = QString::fromLatin1(reinterpret_cast<const char *>(openGLVersion)).toLower(); |
82 | #endif |
83 | if (versionStr.contains(QStringLiteral("mesa")) |
84 | || QCoreApplication::testAttribute(attribute: Qt::AA_UseSoftwareOpenGL)) { |
85 | qWarning(msg: "Only OpenGL ES2 emulation is available for software rendering."); |
86 | isES = true; |
87 | } |
88 | #endif |
89 | |
90 | if (dummySurface) { |
91 | ctx->doneCurrent(); |
92 | delete ctx; |
93 | delete dummySurface; |
94 | } |
95 | |
96 | if (isES) { |
97 | // For ES2 only attributes |
98 | surfaceFormat.setRedBufferSize(8); |
99 | surfaceFormat.setBlueBufferSize(8); |
100 | surfaceFormat.setGreenBufferSize(8); |
101 | } else { |
102 | surfaceFormat.setVersion(major: 2, minor: 1); |
103 | surfaceFormat.setProfile(QSurfaceFormat::CoreProfile); |
104 | // For OpenGL only attributes |
105 | if (antialias) |
106 | surfaceFormat.setSamples(8); |
107 | else |
108 | surfaceFormat.setSamples(0); |
109 | } |
110 | |
111 | return surfaceFormat; |
112 | } |
113 | |
114 | } |
115 | |
116 | #endif |
117 |