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// Copyright (C) 2023 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
// Copyright (C) 2022 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 450
layout(location = 0) in vec2 qt_TexCoord0;
layout(location = 0) out vec4 fragColor;
layout(std140, binding = 0) uniform buf {
mat4 qt_Matrix;
float qt_Opacity;
float hue;
};
float hueToIntensity(float v1, float v2, float h) {
h = fract(h);
if (h < 1.0 / 6.0)
return v1 + (v2 - v1) * 6.0 * h;
else if (h < 1.0 / 2.0)
return v2;
else if (h < 2.0 / 3.0)
return v1 + (v2 - v1) * 6.0 * (2.0 / 3.0 - h);
return v1;
}
vec3 HSLtoRGB(vec3 color) {
float h = color.x;
float l = color.z;
float s = color.y;
if (s < 1.0 / 256.0)
return vec3(l, l, l);
float v1;
float v2;
if (l < 0.5)
v2 = l * (1.0 + s);
else
v2 = (l + s) - (s * l);
v1 = 2.0 * l - v2;
float d = 1.0 / 3.0;
float r = hueToIntensity(v1, v2, h + d);
float g = hueToIntensity(v1, v2, h);
float b = hueToIntensity(v1, v2, h - d);
return vec3(r, g, b);
}
void main() {
vec4 c = vec4(1.0);
c.rgb = HSLtoRGB(vec3(hue, 1.0 - qt_TexCoord0.t, qt_TexCoord0.s));
fragColor = c * qt_Opacity;
}
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