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Diffstat (limited to 'src/foundation/qt/formatdiscovery.cpp')
-rw-r--r-- | src/foundation/qt/formatdiscovery.cpp | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/src/foundation/qt/formatdiscovery.cpp b/src/foundation/qt/formatdiscovery.cpp new file mode 100644 index 0000000..7ea762b --- /dev/null +++ b/src/foundation/qt/formatdiscovery.cpp @@ -0,0 +1,126 @@ +/**************************************************************************** +** +** 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 |