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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Mobility Components.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
import QtQuick 2.0
Effect {
divider: false
parameters: ListModel {
ListElement {
name: "extent"
value: 0.5
}
}
// Transform slider values, and bind result to shader uniforms
property real curlExtent: 1.0 - parameters.get(0).value
fragmentShaderSrc: "uniform float dividerValue;
uniform float curlExtent;
uniform sampler2D source;
uniform lowp float qt_Opacity;
varying vec2 qt_TexCoord0;
const float minAmount = -0.16;
const float maxAmount = 1.3;
const float PI = 3.141592653589793;
const float scale = 512.0;
const float sharpness = 3.0;
const vec4 bgColor = vec4(1.0, 1.0, 0.8, 1.0);
float amount = curlExtent * (maxAmount - minAmount) + minAmount;
float cylinderCenter = amount;
// 360 degrees * amount
float cylinderAngle = 2.0 * PI * amount;
const float cylinderRadius = 1.0 / PI / 2.0;
vec3 hitPoint(float hitAngle, float yc, vec3 point, mat3 rrotation)
{
float hitPoint = hitAngle / (2.0 * PI);
point.y = hitPoint;
return rrotation * point;
}
vec4 antiAlias(vec4 color1, vec4 color2, float distance)
{
distance *= scale;
if (distance < 0.0) return color2;
if (distance > 2.0) return color1;
float dd = pow(1.0 - distance / 2.0, sharpness);
return ((color2 - color1) * dd) + color1;
}
float distanceToEdge(vec3 point)
{
float dx = abs(point.x > 0.5 ? 1.0 - point.x : point.x);
float dy = abs(point.y > 0.5 ? 1.0 - point.y : point.y);
if (point.x < 0.0) dx = -point.x;
if (point.x > 1.0) dx = point.x - 1.0;
if (point.y < 0.0) dy = -point.y;
if (point.y > 1.0) dy = point.y - 1.0;
if ((point.x < 0.0 || point.x > 1.0) && (point.y < 0.0 || point.y > 1.0)) return sqrt(dx * dx + dy * dy);
return min(dx, dy);
}
vec4 seeThrough(float yc, vec2 p, mat3 rotation, mat3 rrotation)
{
float hitAngle = PI - (acos(yc / cylinderRadius) - cylinderAngle);
vec3 point = hitPoint(hitAngle, yc, rotation * vec3(p, 1.0), rrotation);
if (yc <= 0.0 && (point.x < 0.0 || point.y < 0.0 || point.x > 1.0 || point.y > 1.0))
return bgColor;
if (yc > 0.0)
return texture2D(source, p);
vec4 color = texture2D(source, point.xy);
vec4 tcolor = vec4(0.0);
return antiAlias(color, tcolor, distanceToEdge(point));
}
vec4 seeThroughWithShadow(float yc, vec2 p, vec3 point, mat3 rotation, mat3 rrotation)
{
float shadow = distanceToEdge(point) * 30.0;
shadow = (1.0 - shadow) / 3.0;
if (shadow < 0.0)
shadow = 0.0;
else
shadow *= amount;
vec4 shadowColor = seeThrough(yc, p, rotation, rrotation);
shadowColor.r -= shadow;
shadowColor.g -= shadow;
shadowColor.b -= shadow;
return shadowColor;
}
vec4 backside(float yc, vec3 point)
{
vec4 color = texture2D(source, point.xy);
float gray = (color.r + color.b + color.g) / 15.0;
gray += (8.0 / 10.0) * (pow(1.0 - abs(yc / cylinderRadius), 2.0 / 10.0) / 2.0 + (5.0 / 10.0));
color.rgb = vec3(gray);
return color;
}
void main(void)
{
const float angle = 30.0 * PI / 180.0;
float c = cos(-angle);
float s = sin(-angle);
mat3 rotation = mat3(
c, s, 0,
-s, c, 0,
0.12, 0.258, 1
);
c = cos(angle);
s = sin(angle);
mat3 rrotation = mat3(
c, s, 0,
-s, c, 0,
0.15, -0.5, 1
);
vec3 point = rotation * vec3(qt_TexCoord0, 1.0);
float yc = point.y - cylinderCenter;
vec4 color = vec4(1.0, 0.0, 0.0, 1.0);
if (yc < -cylinderRadius) {
// See through to background
color = bgColor;
} else if (yc > cylinderRadius) {
// Flat surface
color = texture2D(source, qt_TexCoord0);
} else {
float hitAngle = (acos(yc / cylinderRadius) + cylinderAngle) - PI;
float hitAngleMod = mod(hitAngle, 2.0 * PI);
if ((hitAngleMod > PI && amount < 0.5) || (hitAngleMod > PI/2.0 && amount < 0.0)) {
color = seeThrough(yc, qt_TexCoord0, rotation, rrotation);
} else {
point = hitPoint(hitAngle, yc, point, rrotation);
if (point.x < 0.0 || point.y < 0.0 || point.x > 1.0 || point.y > 1.0) {
color = seeThroughWithShadow(yc, qt_TexCoord0, point, rotation, rrotation);
} else {
color = backside(yc, point);
vec4 otherColor;
if (yc < 0.0) {
float shado = 1.0 - (sqrt(pow(point.x - 0.5, 2.0) + pow(point.y - 0.5, 2.0)) / 0.71);
shado *= pow(-yc / cylinderRadius, 3.0);
shado *= 0.5;
otherColor = vec4(0.0, 0.0, 0.0, shado);
} else {
otherColor = texture2D(source, qt_TexCoord0);
}
color = antiAlias(color, otherColor, cylinderRadius - abs(yc));
// This second antialiasing step causes the shader to fail to render, on
// Symbian devices (tested so far using IVE3.5). Running out of scratch
// memory?
}
}
}
gl_FragColor = qt_Opacity * color;
}"
}
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