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// Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
// Copyright (C) 2016 The Qt Company Ltd and/or its subsidiary(-ies).
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qalphacoverage.h"
#include "qrenderstate_p.h"
QT_BEGIN_NAMESPACE
namespace Qt3DRender {
/*!
\class Qt3DRender::QAlphaCoverage
\since 5.7
\ingroup renderstates
\inmodule Qt3DRender
\brief Enable alpha-to-coverage multisampling mode.
A Qt3DRender::QAlphaCoverage class enables alpha-to-coverage multisampling mode.
When enabled, the fragment alpha value is used as a coverage for the sample
and combined with fragment coverage value. Qt3DRender::QAlphaCoverage does
nothing if multisampling is disabled. Alpha-to-coverage is most useful when
order independent blending is required, for example when rendering leaves,
grass and other rich vegetation.
It can be added to a QRenderPass by calling QRenderPass::addRenderState():
\code
QRenderPass *renderPass = new QRenderPass();
// Create a alpha coverage render state
QAlphaCoverage *alphaCoverage = new QAlphaCoverage();
QMultiSampleAntiAliasing *multiSampleAntialiasing = new QMultiSampleAntiAliasing();
// Add the render states to the render pass
renderPass->addRenderState(alphaCoverage);
renderPass->addRenderState(multiSampleAntialiasing);
\endcode
Or to a QRenderStateSet by calling QRenderStateSet::addRenderState():
\code
QRenderStateSet *renderStateSet = new QRenderStateSet();
// Create a alpha coverage render state
QAlphaCoverage *alphaCoverage = new QAlphaCoverage();
QMultiSampleAntiAliasing *multiSampleAntialiasing = new QMultiSampleAntiAliasing();
// Add the render states to the render state set
renderStateSet->addRenderState(alphaCoverage);
renderStateSet->addRenderState(multiSampleAntialiasing);
\endcode
\sa Qt3DRender::QMultiSampleAntiAliasing
*/
/*!
\qmltype AlphaCoverage
\since 5.7
\ingroup renderstates
\inqmlmodule Qt3D.Render
\instantiates Qt3DRender::QAlphaCoverage
\inherits RenderState
\brief Enable alpha-to-coverage multisampling mode.
An AlphaCoverage type enables alpha-to-coverage multisampling mode.
When enabled, the fragment alpha value is used as a coverage for the sample
and combined with fragment coverage value. AlphaCoverage does nothing if
multisampling is disabled. Alpha-to-coverage is most useful when
order independent blending is required, for example when rendering leaves,
grass and other rich vegetation.
It can be added to a RenderPass:
\qml
RenderPass {
shaderProgram: ShaderProgram {
// ...
}
renderStates: [
AlphaCoverage {},
MultiSampleAntiAliasing {}
]
}
\endqml
Or to a RenderStateSet:
\qml
RenderStateSet {
renderStates: [
AlphaCoverage {},
MultiSampleAntiAliasing {}
]
}
\endqml
\sa MultiSampleAntiAliasing
*/
class QAlphaCoveragePrivate : public QRenderStatePrivate
{
public :
QAlphaCoveragePrivate()
: QRenderStatePrivate(Render::AlphaCoverageStateMask)
{}
Q_DECLARE_PUBLIC(QAlphaCoverage)
};
/*!
The constructor creates a new QAlphaCoverage::QAlphaCoverage instance
with the specified \a parent.
*/
QAlphaCoverage::QAlphaCoverage(QNode *parent)
: QRenderState(*new QAlphaCoveragePrivate, parent)
{
}
/*! \internal */
QAlphaCoverage::~QAlphaCoverage()
{
}
} // namespace Qt3DRender
QT_END_NAMESPACE
#include "moc_qalphacoverage.cpp"
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