UniformAnimator QML Type

The UniformAnimator type animates a uniform of a ShaderEffect . 更多...

import 语句：	import QtQuick 2.12
Since:	Qt 5.2
继承：	Animator

所有成员列表，包括继承成员

特性

uniform : string

详细描述

Animator types are different from normal Animation types. When using an Animator, the animation can be run in the render thread and the property value will jump to the end when the animation is complete.

The value of the QML property defining the uniform is updated after the animation has finished.

The following snippet shows how to use a UniformAnimator together with a ShaderEffect 项。

ShaderEffect {
    id: shader
    width: 50
    height: 50
    property variant t;
    UniformAnimator {
        target: shader
        uniform: "t"
        from: 0
        to: 1
        duration: 1000
        running: true
    }
    fragmentShader:
    "
        uniform lowp float t;
        varying highp vec2 qt_TexCoord0;
        void main() {
            lowp float c = qt_TexCoord0.y;
            gl_FragColor = vec4(0, 0, c * t, 1);
        }
    "
}

It is also possible to use the on keyword to tie the UniformAnimator directly to a uniform of a ShaderEffect 实例。

ShaderEffect {
    width: 50
    height: 50
    property variant t;
    UniformAnimator on t {
        from: 0
        to: 1
        duration: 1000
    }
    fragmentShader:
    "
        uniform lowp float t;
        varying highp vec2 qt_TexCoord0;
        void main() {
            lowp float c = qt_TexCoord0.y;
            gl_FragColor = vec4(c * t, 0, 0, 1);
        }
    "
}

另请参阅 ShaderEffect and ShaderEffectSource .

特性文档编制

uniform : string

This property holds the name of the uniform to animate.

The value of the uniform must correspond to both a property on the target ShaderEffect and must be a uniform of type float in the fragment or vertex shader.