| 1 | // Copyright (C) 2016 The Qt Company Ltd. |
|---|---|
| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only |
| 3 | |
| 4 | #ifndef QUTILS_H |
| 5 | #define QUTILS_H |
| 6 | |
| 7 | #include <QtGui/QSurfaceFormat> |
| 8 | #include <QtGui/QOpenGLContext> |
| 9 | #include <QtGui/QOpenGLFunctions> |
| 10 | #include <QtGui/QOffscreenSurface> |
| 11 | #include <QtCore/QCoreApplication> |
| 12 | |
| 13 | QT_BEGIN_NAMESPACE |
| 14 | |
| 15 | [[maybe_unused]] |
| 16 | static inline QSurfaceFormat qDefaultSurfaceFormat(bool antialias) |
| 17 | { |
| 18 | bool isES = false; |
| 19 | |
| 20 | QSurfaceFormat surfaceFormat; |
| 21 | |
| 22 | // Common attributes |
| 23 | surfaceFormat.setDepthBufferSize(24); |
| 24 | surfaceFormat.setStencilBufferSize(8); |
| 25 | surfaceFormat.setSwapBehavior(QSurfaceFormat::DoubleBuffer); |
| 26 | surfaceFormat.setRenderableType(QSurfaceFormat::DefaultRenderableType); |
| 27 | |
| 28 | QOpenGLContext *ctx = QOpenGLContext::currentContext(); |
| 29 | QOffscreenSurface *dummySurface = nullptr; |
| 30 | if (!ctx) { |
| 31 | dummySurface = new QOffscreenSurface(); |
| 32 | dummySurface->setFormat(surfaceFormat); |
| 33 | dummySurface->create(); |
| 34 | ctx = new QOpenGLContext; |
| 35 | ctx->setFormat(surfaceFormat); |
| 36 | ctx->create(); |
| 37 | ctx->makeCurrent(surface: dummySurface); |
| 38 | } |
| 39 | |
| 40 | #if QT_CONFIG(opengles2) |
| 41 | isES = true; |
| 42 | #elif (QT_VERSION < QT_VERSION_CHECK(5, 3, 0)) |
| 43 | isES = false; |
| 44 | #else |
| 45 | isES = ctx->isOpenGLES(); |
| 46 | #endif |
| 47 | |
| 48 | #if (QT_VERSION >= QT_VERSION_CHECK(5, 4, 0)) |
| 49 | // We support only ES2 emulation with software renderer for now |
| 50 | QString versionStr; |
| 51 | #ifdef Q_OS_WIN |
| 52 | const GLubyte *openGLVersion = ctx->functions()->glGetString(GL_VERSION); |
| 53 | versionStr = QString::fromLatin1(reinterpret_cast<const char *>(openGLVersion)).toLower(); |
| 54 | #endif |
| 55 | if (versionStr.contains(QStringLiteral("mesa")) |
| 56 | || QCoreApplication::testAttribute(attribute: Qt::AA_UseSoftwareOpenGL)) { |
| 57 | qWarning(msg: "Only OpenGL ES2 emulation is available for software rendering."); |
| 58 | isES = true; |
| 59 | } |
| 60 | #endif |
| 61 | |
| 62 | if (dummySurface) { |
| 63 | ctx->doneCurrent(); |
| 64 | delete ctx; |
| 65 | delete dummySurface; |
| 66 | } |
| 67 | |
| 68 | if (isES) { |
| 69 | // For ES2 only attributes |
| 70 | surfaceFormat.setRedBufferSize(8); |
| 71 | surfaceFormat.setBlueBufferSize(8); |
| 72 | surfaceFormat.setGreenBufferSize(8); |
| 73 | } else { |
| 74 | surfaceFormat.setVersion(major: 2, minor: 1); |
| 75 | surfaceFormat.setProfile(QSurfaceFormat::CoreProfile); |
| 76 | // For OpenGL only attributes |
| 77 | if (antialias) |
| 78 | surfaceFormat.setSamples(8); |
| 79 | else |
| 80 | surfaceFormat.setSamples(0); |
| 81 | } |
| 82 | |
| 83 | return surfaceFormat; |
| 84 | } |
| 85 | |
| 86 | QT_END_NAMESPACE |
| 87 | |
| 88 | #endif |
| 89 |