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++ // Copyright (C) 2025 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
++
++ #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;
++ vec4 color;
++ vec3 iResolution;
++ vec2 rectSize;
++ vec4 radius4;
++ float blur;
++ };
++
++ float roundedBox4R(vec2 centerPos, vec2 size, vec4 radii) {
++ // Get corner index [0..3] from centerPos
++ int i = int(2.0 + (0.5 * sign(centerPos.x)) + sign(centerPos.y));
++ return length(max(abs(centerPos) - size + radii[i], 0.0)) - radii[i];
++ }
++
++ void main()
++ {
++ float box = roundedBox4R(fragCoord - iResolution.xy * 0.5, rectSize, radius4);
++ float a = 1.0 - smoothstep(0.0, blur, box);
++ fragColor = color * qt_Opacity * a * a;
++ }