qt-everywhere-src-5.15.1/qtquickcontrols/src/controls/Shaders/blur.vert

attribute highp vec4 qt_Vertex;
attribute highp vec2 qt_MultiTexCoord0;

uniform highp mat4 qt_Matrix;
uniform highp float yStep;
uniform highp float xStep;

varying highp vec2 qt_TexCoord0;
varying highp vec2 qt_TexCoord1;
varying highp vec2 qt_TexCoord2;
varying highp vec2 qt_TexCoord3;

void main() {
    qt_TexCoord0 = vec2(qt_MultiTexCoord0.x + xStep, qt_MultiTexCoord0.y + yStep * 0.36);
    qt_TexCoord1 = vec2(qt_MultiTexCoord0.x + xStep * 0.36, qt_MultiTexCoord0.y - yStep);
    qt_TexCoord2 = vec2(qt_MultiTexCoord0.x - xStep * 0.36, qt_MultiTexCoord0.y + yStep);
    qt_TexCoord3 = vec2(qt_MultiTexCoord0.x - xStep, qt_MultiTexCoord0.y - yStep * 0.36);
    gl_Position = qt_Matrix * qt_Vertex;
}