GridMesh

import QtQuick 2.0

ShaderEffect {
    width: 200
    height: 200
    mesh: GridMesh {
        resolution: Qt.size(20, 20)
    }
    property variant source: Image {
        source: "qt-logo.png"
        sourceSize { width: 200; height: 200 }
    }
    vertexShader: "
        uniform highp mat4 qt_Matrix;
        attribute highp vec4 qt_Vertex;
        attribute highp vec2 qt_MultiTexCoord0;
        varying highp vec2 qt_TexCoord0;
        uniform highp float width;
        void main() {
            highp vec4 pos = qt_Vertex;
            highp float d = .5 * smoothstep(0., 1., qt_MultiTexCoord0.y);
            pos.x = width * mix(d, 1.0 - d, qt_MultiTexCoord0.x);
            gl_Position = qt_Matrix * pos;
            qt_TexCoord0 = qt_MultiTexCoord0;
        }"
}