- Qt 5.5
- Qt3D Module
- Qt3D: Deferred Renderer C++ Example
- gbuffer.cpp Example File
- Qt 5.5.1 Reference Documentation

# gbuffer.cpp Example File

deferred-renderer-cpp/gbuffer.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
    ** Contact: http://www.qt-project.org/legal
    **
    ** This file is part of the Qt3D module of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:LGPL3$
    ** 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 http://www.qt.io/terms-conditions. For further
    ** information use the contact form at http://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.LGPLv3 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.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 later as published by the Free
    ** Software Foundation and appearing in the file LICENSE.GPL included in
    ** the packaging of this file. Please review the following information to
    ** ensure the GNU General Public License version 2.0 requirements will be
    ** met: http://www.gnu.org/licenses/gpl-2.0.html.
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    ****************************************************************************/

    #include "gbuffer.h"

    GBuffer::GBuffer(Qt3D::QNode *parent)
        : Qt3D::QRenderTarget(parent)
    {
        const Qt3D::QAbstractTextureProvider::TextureFormat formats[AttachmentsCount] = {
            Qt3D::QAbstractTextureProvider::RGBA32F,
            Qt3D::QAbstractTextureProvider::RGB32F,
            Qt3D::QAbstractTextureProvider::RGB16F,
            Qt3D::QAbstractTextureProvider::D32F
        };

        const Qt3D::QRenderAttachment::RenderAttachmentType attachmentTypes[AttachmentsCount] = {
            Qt3D::QRenderAttachment::ColorAttachment0,
            Qt3D::QRenderAttachment::ColorAttachment1,
            Qt3D::QRenderAttachment::ColorAttachment2,
            Qt3D::QRenderAttachment::DepthAttachment
        };

        const QString attachmentNames[AttachmentsCount] = {
            QString::fromLatin1("color"),
            QString::fromLatin1("position"),
            QString::fromLatin1("normal"),
            QString::fromLatin1("depth")
        };

        for (int i = 0; i < AttachmentsCount; i++) {
            Qt3D::QRenderAttachment *attachment = new Qt3D::QRenderAttachment(this);

            m_textures[i] = new Qt3D::QTexture2D();
            m_textures[i]->setFormat(formats[i]);
            m_textures[i]->setWidth(1024);
            m_textures[i]->setHeight(1024);
            m_textures[i]->setGenerateMipMaps(false);
            m_textures[i]->setWrapMode(Qt3D::QTextureWrapMode(Qt3D::QTextureWrapMode::ClampToEdge));
            m_textures[i]->setMinificationFilter(Qt3D::QAbstractTextureProvider::Linear);
            m_textures[i]->setMagnificationFilter(Qt3D::QAbstractTextureProvider::Linear);

            attachment->setTexture(m_textures[i]);
            attachment->setType(attachmentTypes[i]);
            attachment->setName(attachmentNames[i]);

            addAttachment(attachment);
        }
    }

    Qt3D::QAbstractTextureProvider *GBuffer::colorTexture() const
    {
        return m_textures[Color];
    }

    Qt3D::QAbstractTextureProvider *GBuffer::positionTexture() const
    {
        return m_textures[Position];
    }

    Qt3D::QAbstractTextureProvider *GBuffer::normalTexture() const
    {
        return m_textures[Normal];
    }

    Qt3D::QAbstractTextureProvider *GBuffer::depthTexture() const
    {
        return m_textures[Depth];
    }