qutils.h - mozsearch

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// Copyright (C) 2016 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

#ifdef QTGRAPHS_QUTILS_H

#error Mixing QtDataVisualization and QtGraphs in the same TU is unsupported since they use\

 the same class names.

#endif

#ifndef QTDATAVIS3D_QUTILS_H

#define QTDATAVIS3D_QUTILS_H

#include <QtGui/QSurfaceFormat>

#include <QtGui/QOpenGLContext>

#include <QtGui/QOpenGLFunctions>

#include <QtGui/QOffscreenSurface>

#include <QtCore/QCoreApplication>

QT_BEGIN_NAMESPACE

[[maybe_unused]]

static inline QSurfaceFormat qDefaultSurfaceFormat(bool antialias)

    bool isES = false;

    QSurfaceFormat surfaceFormat;

    // Common attributes

    surfaceFormat.setDepthBufferSize(24);

    surfaceFormat.setStencilBufferSize(8);

    surfaceFormat.setSwapBehavior(QSurfaceFormat::DoubleBuffer);

    surfaceFormat.setRenderableType(QSurfaceFormat::DefaultRenderableType);

    QOpenGLContext *ctx = QOpenGLContext::currentContext();

    QOffscreenSurface *dummySurface = nullptr;

    if (!ctx) {

        dummySurface = new QOffscreenSurface();

        dummySurface->setFormat(surfaceFormat);

        dummySurface->create();

        ctx = new QOpenGLContext;

        ctx->setFormat(surfaceFormat);

        ctx->create();

        ctx->makeCurrent(dummySurface);

#if QT_CONFIG(opengles2)

    isES = true;

#elif (QT_VERSION < QT_VERSION_CHECK(5, 3, 0))

    isES = false;

#else

    isES = ctx->isOpenGLES();

#endif

#if (QT_VERSION >= QT_VERSION_CHECK(5, 4, 0))

    // We support only ES2 emulation with software renderer for now

    QString versionStr;

#ifdef Q_OS_WIN

    const GLubyte *openGLVersion = ctx->functions()->glGetString(GL_VERSION);

    versionStr = QString::fromLatin1(reinterpret_cast<const char *>(openGLVersion)).toLower();

#endif

    if (versionStr.contains(QStringLiteral("mesa"))

            || QCoreApplication::testAttribute(Qt::AA_UseSoftwareOpenGL)) {

        qWarning("Only OpenGL ES2 emulation is available for software rendering.");

        isES = true;

#endif

    if (dummySurface) {

        ctx->doneCurrent();

        delete ctx;

        delete dummySurface;

    if (isES) {

        // For ES2 only attributes

        surfaceFormat.setRedBufferSize(8);

        surfaceFormat.setBlueBufferSize(8);

        surfaceFormat.setGreenBufferSize(8);

    } else {

        surfaceFormat.setVersion(2, 1);

        surfaceFormat.setProfile(QSurfaceFormat::CoreProfile);

        // For OpenGL only attributes

        if (antialias)

            surfaceFormat.setSamples(8);

        else

            surfaceFormat.setSamples(0);

    return surfaceFormat;

QT_END_NAMESPACE

#endif