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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtQuick module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qsgrendernode_p.h"
QT_BEGIN_NAMESPACE
QSGRenderNode::QSGRenderNode()
: QSGNode(RenderNodeType)
, m_matrix(0)
, m_clip_list(0)
, m_opacity(1)
{
}
void QSGRenderNode::setInheritedOpacity(qreal opacity)
{
Q_ASSERT(opacity >= 0 && opacity <= 1);
m_opacity = opacity;
}
/*!
\fn QSGRenderNode::StateFlags QSGRenderNode::changedStates()
This function should return a mask where each bit represents OpenGL states changed by
the \l render() function:
\list
\li DepthState - depth write mask, depth test enabled, depth comparison function
\li StencilState - stencil write masks, stencil test enabled, stencil operations,
stencil comparison functions
\li ScissorState - scissor enabled, scissor test enabled
\li ColorState - clear color, color write mask
\li BlendState - blend enabled, blend function
\li CullState - front face, cull face enabled
\li ViewportState - viewport
\endlist
The function is called by the renderer so it can reset the OpenGL states after rendering this
node.
\internal
*/
/*!
\fn void QSGRenderNode::render(const RenderState &state)
This function is called by the renderer and should paint this node with OpenGL commands.
The states necessary for clipping has already been set before the function is called.
The clip is a combination of a stencil clip and scissor clip. Information about the clip is
found in \a state.
The effective opacity can be retrieved with \l inheritedOpacity().
The projection matrix is available through \a state, while the model-view matrix can be
fetched with \l matrix(). The combined matrix is then the projection matrix times the
model-view matrix.
The following states are set before this function is called:
\list
\li glDepthMask(false)
\li glDisable(GL_DEPTH_TEST)
\li glStencilMask(0)
\li glEnable(GL_STENCIL_TEST)/glDisable(GL_STENCIL_TEST) depending on clip
\li glStencilFunc(GL_EQUAL, state.stencilValue, 0xff) depending on clip
\li glEnable(GL_SCISSOR_TEST)/glDisable(GL_SCISSOR_TEST) depending on clip
\li glScissor(state.scissorRect.x(), state.scissorRect.y(),
state.scissorRect.width(), state.scissorRect.height()) depending on clip
\li glEnable(GL_BLEND)
\li glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA)
\li glDisable(GL_CULL_FACE)
\endlist
States that are not listed above, but are included in \l StateFlags, can have arbitrary
values.
\l changedStates() should return which states this function has changed. If a state is not
covered by \l StateFlags, the state should be set to the default value according to the
OpenGL specification.
\internal
*/
QT_END_NAMESPACE
|
