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/****************************************************************************
**
** Copyright (C) 2019 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of Qt 3D Studio.
**
** $QT_BEGIN_LICENSE:GPL$
** 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtGui/qopenglcontext.h>
#include <QtGui/qoffscreensurface.h>
#include <QtGui/qopenglfunctions.h>
#include <QtGui/qopengltexture.h>
#include "qstudio3dglobal.h"
#include "Qt3DSFoundation.h"
QT_BEGIN_NAMESPACE
namespace Q3DS {
static QSurfaceFormat findIdealGLVersion()
{
QSurfaceFormat fmt;
fmt.setProfile(QSurfaceFormat::CoreProfile);
// Advanced: Try 4.3 core (so we get compute shaders for instance)
fmt.setVersion(4, 3);
QOpenGLContext ctx;
ctx.setFormat(fmt);
if (ctx.create() && ctx.format().version() >= qMakePair(4, 3)) {
qDebug("Requesting OpenGL 4.3 core context succeeded");
return ctx.format();
}
// Basic: Stick with 3.3 for now to keep less fortunate, Mesa-based systems happy
fmt.setVersion(3, 3);
ctx.setFormat(fmt);
if (ctx.create() && ctx.format().version() >= qMakePair(3, 3)) {
qDebug("Requesting OpenGL 3.3 core context succeeded");
return ctx.format();
}
qWarning("Failed to get OpenGL 3.3 or OpenGL 4.3 context!");
return fmt;
}
static QSurfaceFormat findIdealGLESVersion()
{
QSurfaceFormat fmt;
// Advanced: Try 3.1 (so we get compute shaders for instance)
fmt.setVersion(3, 1);
QOpenGLContext ctx;
ctx.setFormat(fmt);
// Now, it's important to check the format with the actual version (parsed
// back from GL_VERSION) since some implementations, ANGLE for instance,
// are broken and succeed the 3.1 context request even though they only
// support and return a 3.0 context. This is against the spec since 3.0 is
// obviously not backwards compatible with 3.1, but hey...
if (ctx.create() && ctx.format().version() >= qMakePair(3, 1)) {
qDebug("Requesting OpenGL ES 3.1 context succeeded");
return ctx.format();
}
// Basic: OpenGL ES 3.0 is a hard requirement at the moment since we can
// only generate 300 ES shaders, uniform buffers are mandatory.
fmt.setVersion(3, 0);
ctx.setFormat(fmt);
if (ctx.create() && ctx.format().version() >= qMakePair(3, 0)) {
qDebug("Requesting OpenGL ES 3.0 context succeeded");
return ctx.format();
}
fmt.setVersion(2, 0);
ctx.setFormat(fmt);
if (ctx.create()) {
qDebug("Requesting OpenGL ES 2.0 context succeeded");
return fmt;
}
qWarning("Failed to get OpenGL ES 2.0, 3.0 or 3.1 context");
return fmt;
}
QSurfaceFormat surfaceFormat()
{
static const QSurfaceFormat f = [] {
QSurfaceFormat fmt;
// works in dynamic gl builds too because there's a qguiapp already
// this requirement is also a problem, see QT3DS-3603
if (QOpenGLContext::openGLModuleType() == QOpenGLContext::LibGL)
fmt = findIdealGLVersion();
else
fmt = findIdealGLESVersion();
fmt.setDepthBufferSize(24);
fmt.setStencilBufferSize(8);
// Ignore MSAA here as that is a per-layer setting.
return fmt;
}();
return f;
}
} // End namespace Q3DS
QT_END_NAMESPACE
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