qt-everywhere-src-5.15.1/qtdeclarative/tests/manual/nodetypes_ng/shadow_pass1.frag

#version 440

layout(location = 0) in vec2 qt_TexCoord0;
layout(location = 0) out vec4 fragColor;

layout(binding = 1) uniform sampler2D source;

layout(std140, binding = 0) uniform buf {
    // The built-in vertex shader assumes the first 68 bytes are matrix and
    // opacity so have them there even though the matrix is not used here.
    mat4 qt_Matrix;
    float qt_Opacity;
    vec2 delta;
} ubuf;

void main()
{
    fragColor = (0.0538 * texture(source, qt_TexCoord0 - 3.182 * ubuf.delta)
        + 0.3229 * texture(source, qt_TexCoord0 - 1.364 * ubuf.delta)
        + 0.2466 * texture(source, qt_TexCoord0)
        + 0.3229 * texture(source, qt_TexCoord0 + 1.364 * ubuf.delta)
        + 0.0538 * texture(source, qt_TexCoord0 + 3.182 * ubuf.delta)) * ubuf.qt_Opacity;
}