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/****************************************************************************
**
** Copyright (C) 2008-2012 NVIDIA Corporation.
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#pragma once
#ifndef QT3DS_RENDER_SUB_PRESENTATION_HELPER_H
#define QT3DS_RENDER_SUB_PRESENTATION_HELPER_H
#include "Qt3DSRenderContextCore.h"
#include "Qt3DSRenderer.h"
#include "render/Qt3DSRenderContext.h"
namespace qt3ds {
namespace render {
// Small helper object to setup the state needed to render a sub presentation
// correctly. Sub presentations may have transparency, and if they do then
// then need to be rendered with pre multiple alpha disabled. If they don't,
// then they need to be rendered with pre-multiply alpha enabled (and have the alpha channel
// set to 1
struct SSubPresentationHelper
{
IQt3DSRenderContext &m_RenderContext;
QSize m_PreviousPresentationDimensions;
bool m_WasInSubPresentation;
SSubPresentationHelper(IQt3DSRenderContext &inContext,
const QSize &inPresDimensions)
: m_RenderContext(inContext)
, m_PreviousPresentationDimensions(inContext.GetCurrentPresentationDimensions())
, m_WasInSubPresentation(inContext.IsInSubPresentation())
{
m_RenderContext.SetInSubPresentation(true);
m_RenderContext.SetPresentationDimensions(inPresDimensions);
}
~SSubPresentationHelper()
{
m_RenderContext.SetInSubPresentation(m_WasInSubPresentation);
m_RenderContext.SetPresentationDimensions(m_PreviousPresentationDimensions);
}
};
}
}
#endif
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