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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQuick module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or 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.GPL2 and 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-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qquickopenglutils.h"
#include <QOpenGLContext>
#include <QOpenGLFunctions>
#include <QOpenGLFramebufferObject>
#include <private/qopenglvertexarrayobject_p.h>
QT_BEGIN_NAMESPACE
/*!
\namespace QQuickOpenGLUtils
\inmodule QtQuick
\since 6.0
\brief The QQuickOpenGLUtils namespace contains utilities for Qt
Quick when used with an OpenGL backend.
*/
/*!
Call this function to reset the current OpenGL context its default state.
The scene graph uses the OpenGL context and will both rely on and
clobber its state. When mixing raw OpenGL commands with scene
graph rendering, this function provides a convenient way of
resetting the OpenGL context state back to its default values.
This function does not touch state in the fixed-function pipeline.
\warning This function will only reset the OpenGL context in
relation to what may be changed internally as part of the OpenGL
scene graph. It does not reset anything that has been changed
externally such as direct OpenGL calls done inside the application
code if those same calls are not used internally (for example,
various OpenGL 3.x or 4.x specific state).
\since 6.0
*/
void QQuickOpenGLUtils::resetOpenGLState()
{
QOpenGLContext *ctx = QOpenGLContext::currentContext();
if (!ctx)
return;
QOpenGLFunctions *gl = ctx->functions();
gl->glBindBuffer(GL_ARRAY_BUFFER, 0);
gl->glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
QOpenGLVertexArrayObjectHelper *vaoHelper = QOpenGLVertexArrayObjectHelper::vertexArrayObjectHelperForContext(ctx);
if (vaoHelper->isValid())
vaoHelper->glBindVertexArray(0);
if (ctx->isOpenGLES() || (gl->openGLFeatures() & QOpenGLFunctions::FixedFunctionPipeline)) {
int maxAttribs;
gl->glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, &maxAttribs);
for (int i=0; i<maxAttribs; ++i) {
gl->glVertexAttribPointer(i, 4, GL_FLOAT, GL_FALSE, 0, nullptr);
gl->glDisableVertexAttribArray(i);
}
}
gl->glActiveTexture(GL_TEXTURE0);
gl->glBindTexture(GL_TEXTURE_2D, 0);
gl->glDisable(GL_DEPTH_TEST);
gl->glDisable(GL_STENCIL_TEST);
gl->glDisable(GL_SCISSOR_TEST);
gl->glColorMask(true, true, true, true);
gl->glClearColor(0, 0, 0, 0);
gl->glDepthMask(true);
gl->glDepthFunc(GL_LESS);
gl->glClearDepthf(1);
gl->glStencilMask(0xff);
gl->glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
gl->glStencilFunc(GL_ALWAYS, 0, 0xff);
gl->glDisable(GL_BLEND);
gl->glBlendFunc(GL_ONE, GL_ZERO);
gl->glUseProgram(0);
QOpenGLFramebufferObject::bindDefault();
}
QT_END_NAMESPACE
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