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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Data Visualization module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QUTILS_H
#define QUTILS_H
#include <QtGui/QSurfaceFormat>
#include <QtGui/QOpenGLContext>
#include <QtGui/QOpenGLFunctions>
#include <QtGui/QOffscreenSurface>
#include <QtCore/QCoreApplication>
namespace QtDataVisualization {
static inline QSurfaceFormat qDefaultSurfaceFormat(bool antialias = true) Q_DECL_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 = 0;
if (!ctx) {
dummySurface = new QOffscreenSurface();
dummySurface->setFormat(surfaceFormat);
dummySurface->create();
ctx = new QOpenGLContext;
ctx->setFormat(surfaceFormat);
ctx->create();
ctx->makeCurrent(dummySurface);
}
#if defined(QT_OPENGL_ES_2)
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;
}
}
#endif
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