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Bug
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Resolution: Cannot Reproduce
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P2: Important
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None
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5.4.0 Alpha
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None
Using the 'basic' or 'windows' render loop makes the scenegraph continuously redraw this simple qml test:
import QtQuick 2.2 Item { width: 100 height: 100 ShaderEffect { property variant gradientImage: ShaderEffectSource { sourceItem: Rectangle { width: 10; height: 10 } } anchors.fill: parent fragmentShader: " uniform lowp sampler2D gradientImage; uniform lowp float qt_Opacity; void main() { gl_FragColor = vec4(1,1,1,1) * qt_Opacity; } " } }
Commenting out the "uniform lowp sampler2D gradientImage;" in the shader hides the problem.
Tested on X11 and Wayland. It does't happen when using the threaded render loop.