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// Copyright (C) 2025 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#version 440
layout(location = 0) in vec2 texCoord;
layout(location = 1) in vec2 fragCoord;
layout(location = 0) out vec4 fragColor;
layout(std140, binding = 0) uniform buf {
mat4 qt_Matrix;
float qt_Opacity;
vec3 iResolution;
vec2 rectSize;
float radius;
float blur;
vec4 shadowColor;
float thickness;
};
layout(binding = 1) uniform sampler2D iSource;
float roundedBox(vec2 centerPos, vec2 size, float radii) {
return length(max(abs(centerPos) - size + radii, 0.0)) - radii;
}
void main() {
fragColor = texture(iSource, texCoord);
{
const vec4 tex = texture(iSource, texCoord);
if (tex.a <= 0.0) {
fragColor = tex;
} else {
const float blur_ = blur * rectSize.y;
const vec2 center = fragCoord - iResolution.xy * 0.5;
const vec2 offset = vec2(0, rectSize.y * thickness);
const vec2 scale = vec2(0.5, 1);
// Shadow
const float shadowDist = roundedBox(center - offset, rectSize * scale, radius);
const float shadowAlpha = 1.0 - smoothstep(0.0, blur_, shadowDist);
const vec4 bluryShadow = shadowColor * (1.0 - shadowAlpha * shadowAlpha);
fragColor = bluryShadow;
}
}
fragColor = fragColor * qt_Opacity;
}