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QAlphaTest Class

class Qt3DRender::QAlphaTest

The QAlphaTest class specify alpha reference test. More...

Header: #include <QAlphaTest>
CMake: find_package(Qt6 COMPONENTS 3drender REQUIRED) target_link_libraries(mytarget PRIVATE Qt6::3drender)
qmake: QT += 3drender
Since: Qt 5.7
Instantiated By: AlphaTest
Inherits: Qt3DRender::QRenderState

Public Types

enum AlphaFunction { Never, Always, Less, LessOrEqual, Equal, …, NotEqual }

Properties

Public Functions

Qt3DRender::QAlphaTest::AlphaFunction alphaFunction() const
float referenceValue() const

Public Slots

void setAlphaFunction(Qt3DRender::QAlphaTest::AlphaFunction alphaFunction)
void setReferenceValue(float referenceValue)

Signals

void alphaFunctionChanged(Qt3DRender::QAlphaTest::AlphaFunction alphaFunction)
void referenceValueChanged(float referenceValue)

Detailed Description

As the OpenGL documentation explains; The alpha test discards a fragment conditional on the outcome of a comparison between the incoming fragment's alpha value and a constant reference value.

Member Type Documentation

enum QAlphaTest::AlphaFunction

Enumeration for the alpha function values

Constant Value Description
Qt3DRender::QAlphaTest::Never 0x0200 Never pass alpha test
Qt3DRender::QAlphaTest::Always 0x0207 Always pass alpha test
Qt3DRender::QAlphaTest::Less 0x0201 Pass alpha test if fragment alpha is less than reference value
Qt3DRender::QAlphaTest::LessOrEqual 0x0203 Pass alpha test if fragment alpha is less than or equal to reference value
Qt3DRender::QAlphaTest::Equal 0x0202 Pass alpha test if fragment alpha is equal to reference value
Qt3DRender::QAlphaTest::GreaterOrEqual 0x0206 Pass alpha test if fragment alpha is greater than or equal to reference value
Qt3DRender::QAlphaTest::Greater 0x0204 Pass alpha test if fragment alpha is greater than reference value
Qt3DRender::QAlphaTest::NotEqual 0x0205 Pass alpha test if fragment alpha is not equal to reference value

Property Documentation

alphaFunction : AlphaFunction

Holds the alpha function used by the alpha test. Default is Never.

Access functions:

Qt3DRender::QAlphaTest::AlphaFunction alphaFunction() const
void setAlphaFunction(Qt3DRender::QAlphaTest::AlphaFunction alphaFunction)

Notifier signal:

void alphaFunctionChanged(Qt3DRender::QAlphaTest::AlphaFunction alphaFunction)

referenceValue : float

Holds the reference value used by the alpha test. Default is 0.0. When set, the value is clamped between 0 and 1.

Access functions:

float referenceValue() const
void setReferenceValue(float referenceValue)

Notifier signal:

void referenceValueChanged(float referenceValue)

© The Qt Company Ltd
Licensed under the GNU Free Documentation License, Version 1.3.
https://doc.qt.io/qt-6.2/qt3drender-qalphatest.html