QAlphaTest Class

class Qt3DRender ::QAlphaTest

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

头：	#include <QAlphaTest>
qmake:	QT += 3drender
Since:	Qt 5.7
实例化：	AlphaTest
继承：	Qt3DRender::QRenderState

该类在 Qt 5.7 引入。

所有成员列表，包括继承成员

公共类型

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

特性

alphaFunction : AlphaFunction
referenceValue : float

公共函数

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

公共槽

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

信号

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

详细描述

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.

成员类型文档编制

enum QAlphaTest:: AlphaFunction

Enumeration for the alpha function values

常量	值	描述
`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

特性文档编制

alphaFunction : AlphaFunction

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

访问函数：

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

通知程序信号：

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.

访问函数：

float	referenceValue () const
void	setReferenceValue (float referenceValue )

通知程序信号：

void	referenceValueChanged (float referenceValue )